Stile Extension Patents (Class 182/201)
  • Patent number: 10519716
    Abstract: A ladder support for attaching on a leg of a ladder. The ladder support attachment includes a pair of support members that removably secure to opposing legs of a ladder. Each support member includes an upper bar affixed to a lower bar about a hinge. The upper bar includes a first fastener on a second end of the upper bar and the lower bar includes a second fastener on a proximal end of the lower bar. The first and second fasteners removably secure to a leg of the ladder. The pair of support members can transition between a first position and a second position, where the first position is the upper and lower bars resting parallel to the leg of the ladder and the second position is the upper and lower bars forming a triangular shape with the leg where the lower bar rests flush with the ground.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: December 31, 2019
    Inventor: George Saxby
  • Patent number: 9521878
    Abstract: Provided is a functional shoe that automatically prevents a slip, the function shoe including a rotation body part fixed to an outsole of the functional shoe to rotate to a front or rear side of the functional shoe, and an anti-slip part connected to the rotation body part to contact a ground and rotating integrally with the rotation body part according to a sliding direction of the functional shoe. The anti-slip part includes a first distal end, which is sharp and is oriented to the front side of the functional shoe, and a second distal end which is sharp and is oriented to the rear side of the functional shoe.
    Type: Grant
    Filed: May 10, 2013
    Date of Patent: December 20, 2016
    Inventors: Young Keun Park, Young Hwa Park
  • Patent number: 9506292
    Abstract: A ladder specially designed for attachment to a rear door of a cargo van to facilitate the ability of a person to climb onto the vehicle's roof. The ladder has two parallel rails joined by a plurality of transversely extending rungs. Affixed to the upper and lower ends of the ladder rungs are length adjustable brackets supporting door engaging clips designed to fit about the upper and lower edges of a van door without interfering with the ability of the door to open and close. The ladder rails are preferably bent to conform to the contour of the van door.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: November 29, 2016
    Assignee: ROM ACQUISITION CORPORATION
    Inventor: Avraham Y. Levi
  • Patent number: 9500029
    Abstract: An adjustable ladder attachment able to be secured to a vehicle to enhance user stability and safety when servicing the vehicle. The ladder attachment includes an outer ladder assembly with a pair of rails connected by steps, an inner ladder assembly with a pair of rails connected by steps, the inner ladder assembly rails being slidably mounted to the outer ladder assembly rails to one of a plurality of locking positions, and a platform rotatably mounted to a top portion of the inner ladder assembly. The outer ladder assembly is positioned on a ground surface proximate the vehicle and the platform is rotatably adjusted to rest on top of a tire of the vehicle, thereby enabling a user to stand on the platform or the steps of the ladder assemblies.
    Type: Grant
    Filed: September 24, 2014
    Date of Patent: November 22, 2016
    Inventors: Darin Alan Mullins, William Emmett Mullins
  • Patent number: 9206643
    Abstract: A rolling ladder includes opposing side members between which a plurality of treads are disposed at predetermined locations to define a ladder. The ladder further includes a support structure coupled to the ladder and including a front wheel support coupled to a plurality of rolling devices. A leg assembly has a user-adjustable length leg, allowing the user to extend or retract either leg to accommodate uneven or irregular floor surfaces. The leg length may also be adjusted to allow for wear in the material of the leg. A lock mechanism is responsive to user actuation and is configured to move the rolling devices from a rolling position to a retracted position, wherein the leg of the leg assembly contacts the floor to thereby inhibit movement of the ladder.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: December 8, 2015
    Assignee: Material Control, Inc.
    Inventors: James F. Kerr, Nicholas J. Valore
  • Patent number: 9010491
    Abstract: A ladder safety accessory kit (5) for straight and extension ladders (1) having an upper stabilizer assembly (2) that makes the ladder adaptable to any shaped structure or surface, a lower stabilizer assembly (3) that makes the ladder adjustable to accommodate for uneven ground, a leveling measurement device (4) that allows a user to quickly and easily determine that the ladder is level and angled correctly and a storage tray (36) that provides a storage area for tools and other items. The ladder safety accessory kit may be integrated with new ladders or used to retrofit existing ladders.
    Type: Grant
    Filed: November 27, 2009
    Date of Patent: April 21, 2015
    Inventor: Brian T. Trang
  • Publication number: 20140020981
    Abstract: A support apparatus includes at least first and second legs, and levelling means including: at the lower end of each of the first and second legs a cylinder and piston unit, wherein movement of the pistons of the cylinder and piston units relative to the cylinders permits variation in the length of each of the first and second legs; fluid communication means for establishing at least one closed fluid passageway between the cylinder and piston units; and valve means for controlling the passage of fluid through the fluid communication means. In a first position, the valve means permit fluid to flow between the cylinder and piston units via the fluid communication means such that the length of each of the legs is accommodated to the profile of the ground, and in a second position, the valve means do not permit fluid to flow between the cylinder and piston units thereby locking the cylinder and piston units in position.
    Type: Application
    Filed: January 20, 2012
    Publication date: January 23, 2014
    Inventor: Eric Burden
  • Patent number: 8297406
    Abstract: A device capable of extending a foot end of a ladder includes a box tube section with an elongated hole, a long engaging plate with an elongated hole and a plurality of inserting teeth, a short engaging plate with a central fixing hole, two pairs of engaging slots and an engaging nut, and a knob head bolt. The knob head bolt passes through the elongated holes, and the central fixing hole to be tightened to the engaging bolt via a rail of the ladder. The long and short engaging plates are disposed in the box tube section to face to each other. The knob head bolt is loosened or tightened to cause two pairs of the inserting teeth disengaging or inserting into the engaging slots for the box tube section being operated to extend a distance outward the rail stably and safely.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: October 30, 2012
    Assignee: Dofair Co., Ltd.
    Inventor: Tom Yeh
  • Patent number: 8210314
    Abstract: The present invention is related to a new and non-obvious device for adjusting the length of a leg associated with, for example a ladder, tripod or the like. Prior art leg adjustment devices are not without their problems being either extremely complicated and, therefore, expensive to build or difficult to use, heavy or limited to specific adjustment lengths.
    Type: Grant
    Filed: January 2, 2009
    Date of Patent: July 3, 2012
    Inventor: Rex J. Polak
  • Publication number: 20120037454
    Abstract: A base extending mechanism is provided for a ladder in the form of pivotable lower leg sections which can be independently rotated outwards to provide a wider ladder base. This extension of the ladder base is complementary to and supported by a compatible ladder levelling mechanism.
    Type: Application
    Filed: April 23, 2010
    Publication date: February 16, 2012
    Inventor: Michael Patrick Fitzgezald
  • Publication number: 20110303489
    Abstract: A supporting element for an object includes a first leg member and a second leg member. The first leg member is axially movable relative to the second leg member for axially extending the support member. The first leg member includes a house slidably arranged for receiving the second leg member. The house includes a locking element having a locking position for locking the relative axial movement of the first leg member with respect to the second leg member, and an open position for enabling relative axial movement of the two members. A catch may be provided in the locking element. The catch may be tiltably movable within the house for alternately acquiring the locking position and the open position of the locking element. The catch may include a cavity receiving the second leg, wherein the cavity has a stopping surface engaging at least opposed perimeter parts of the second leg member in a locking position of the locking element.
    Type: Application
    Filed: February 11, 2010
    Publication date: December 15, 2011
    Applicant: SMART LEVEL COMPANY B.V.
    Inventor: KarolusTheodorus Wilhelmina Maria BUS
  • Publication number: 20110214946
    Abstract: A device capable of extending a foot end of a ladder includes a box tube section with an elongated hole, a long engaging plate with an elongated hole and a plurality of inserting teeth, a short engaging plate with a central fixing hole, two pairs of engaging slots and an engaging nut, and a knob head bolt. The knob head bolt passes through the elongated holes, and the central fixing hole to be tightened to the engaging bolt via a rail of the ladder. The long and short engaging plates are disposed in the box tube section to face to each other. The knob head bolt is loosened or tightened to cause two pairs of the inserting teeth disengaging or inserting into the engaging slots for the box tube section being operated to extend a distance outward the rail stably and safely.
    Type: Application
    Filed: February 23, 2011
    Publication date: September 8, 2011
    Applicant: DOFAIR CO., LTD.
    Inventor: TOM YEH
  • Patent number: 7789199
    Abstract: Ladder attachment apparatus and methods are disclosed. In one embodiment, an attachment apparatus for a ladder includes a main support adapted to be coupled to the ladder approximately parallel to the rungs. The main support includes a first coupling member proximate a first one of the elongated rails of the ladder and a second coupling member proximate another one of the elongated rails. The attachment apparatus further includes first and second support modules removeably coupled to the first and second coupling members, respectively. Each support module includes a support member including a proximal end and a distal end, and a support arm attached to the support member proximate the distal end and projecting outwardly therefrom in a first direction. The support member includes at least one projecting portion that is removeably coupleable to the corresponding one of the first and second coupling members.
    Type: Grant
    Filed: December 6, 2005
    Date of Patent: September 7, 2010
    Assignee: Trade Associates, Inc.
    Inventors: Skye Lechner Wollenberg, Neil Garrett Stockman
  • Publication number: 20090159367
    Abstract: The Side-Security-Ladder 26 is the first stabilizer with multiple uses for Extension Ladder 24 that focuses on the security area. The stabilizer will allow people to climb up and down the Extension Ladder 24 in a safe, stable and confident way and not need another person to hold the Extension Ladder 24. It has the versatility of turning 360°. It can move from 90° vertical to 90° horizontal. It can also extend from 2 to 3 feet and it has a shoe that pivots up to 30°. The Side-Security-Ladder 26 can be adjusted to aluminum and fiber glass Extension Ladder 24. All of these versatilities are done in a safe way. The Side-Security-Ladder 26 can be used on any place of the side (lateral) legs of the Extension Ladder 24, against the walls, floors, roofs and eaves. The Side-Security-Ladder 26 has two individual legs that can be adjusted to one's necessities.
    Type: Application
    Filed: December 19, 2007
    Publication date: June 25, 2009
    Inventor: Luis Joel Ortiz Perez
  • Publication number: 20080190697
    Abstract: A ladder leveling system for efficiently leveling a ladder positioned upon uneven terrain. The ladder leveling system generally includes an extension member including a channel and at least one slot. At least one bracket is positioned adjacent the extension member, wherein the channel extends between the bracket and the extension member and wherein the bracket includes an aperture. At least one attachment member extends through the aperture and the slot, wherein the attachment member is selectively secured within the slot and wherein the attachment member secures the bracket to the extension member.
    Type: Application
    Filed: February 9, 2007
    Publication date: August 14, 2008
    Inventor: Albert R. Skurkis
  • Publication number: 20080078616
    Abstract: A self-leveling ladder system constituting both a straight or a step ladder system which includes hydraulic cylinders which are attached to the bottom of each of the ladder frames. The hydraulic cylinders are interconnected by hydraulic pressure lines and filled with a hydraulic fluid. The hydraulic pressure lines each include an off and on valve. In an on position of the valve, the hydraulic fluid freely flows through the pressure lines and the hydraulic cylinders. When the ladder, straight or step, is placed on an uneven ground and the foot pads on the bottom of the ladder have reached their proper position with respect to a vertical position of the ladder, the ladder will attain a stable position when the valve is placed into an off position.
    Type: Application
    Filed: October 3, 2006
    Publication date: April 3, 2008
    Inventor: Mark A. Ursitti
  • Publication number: 20070295556
    Abstract: The present invention describes an adjustable telescopic leg system that is adapted to fit on at least one of a plurality of supporting side members that are connected to each other and rest on a ground surface. The adjustable telescopic leg system comprises at least one longitudinally adjustable telescopic leg having a sawtooth-like structure facing towards a latch. The sawtooth-like structure may be formed by a plurality of depressions on the adjustable telescopic leg. The latch may be adapted to fit tightly between an upper edge and a lower edge of the depressions. The adjustable telescopic leg system may further comprise a fixation rod connecting the latch with a release handle for longitudinally adjusting the position of the adjustable leg.
    Type: Application
    Filed: June 22, 2006
    Publication date: December 27, 2007
    Inventor: Oded Grinberg
  • Patent number: 7222696
    Abstract: Independently adjustable ladder extensions for use with folding, step, or extension ladders includes at least one pair of adjustable support legs slidably disposed within the channels of the side rails and having apertures that align with through holes on the side rails so that the support legs can be slidably adjusted within the channels and then locked in the desired position for stabilizing and leveling the ladder on an uneven surface. Locking pins insert into the through holes of the side rails and through the apertures of the support legs for locking the support legs in the position, and the locking pins include a flap member for holding the locking pins in position.
    Type: Grant
    Filed: May 18, 2006
    Date of Patent: May 29, 2007
    Inventor: Elizabeth Jackson
  • Patent number: 7121382
    Abstract: Independently adjustable ladder extensions for use with folding, step, or extension ladders includes at least one pair of ladder extensions with each ladder extension including an adjustable leg disposed within and encompassed by the lower end of the ladder side rail and having apertures that align with through holes of the side rail so that the leg can be slidably adjusted within the side rail and then locked in the desired position for stabilizing and leveling the ladder on an uneven surface. A locking pin inserts into the through holes of the side rail and through the apertures of the leg for locking the adjustable leg in the desired position, and the locking pin includes a flap member for holding the locking pin on the side rail. A traction foot is pivotally mounted to the bottom of each adjustable leg to facilitate the stabilization of the ladder on the uneven surface.
    Type: Grant
    Filed: October 7, 2004
    Date of Patent: October 17, 2006
    Inventor: Elizabeth Jackson
  • Patent number: 7017711
    Abstract: An extender and method for extending the leg of a ladder can both lengthen and stabilize the leg of the ladder. The extender includes a first channel shaped and dimensioned to receive the leg of the ladder. A second channel is shaped and dimensioned to receive the first channel. A first and second members pivotally connect the first channel to the second channel. The second channel may be selectively moved from a stowed position wherein the first channel is received by the second channel, to an extended position wherein the second channel outwardly projects from the first channel and resides in substantially co-linear relationship with the first member. A lock is selectively connectable between the first channel and the second channel to retain the second channel in the extended position. A retainer fixedly attaches the extender to a desired position along the leg of the ladder.
    Type: Grant
    Filed: November 4, 2003
    Date of Patent: March 28, 2006
    Inventor: Shaikh Mehboob Ali
  • Patent number: 6948591
    Abstract: The present invention relates to a support apparatus or accessory capable of attaching to an article, such as a ladder via mating and locking of a primary attachment member connected to the support and a complementary secondary attachment member securable to the ladder. In a preferred form, the support is an adjustable length support for levelling a ladder on an uneven surface. The adjustable length support comprises a fixed component and a moveable component that moves relative to the fixed component to thereby adjust a length of the adjustable length support. The moveable member is securable at a desired length by a securing means.
    Type: Grant
    Filed: December 12, 2003
    Date of Patent: September 27, 2005
    Inventors: Jon Robert Scott, Andrew Anthony Richards
  • Patent number: 6745870
    Abstract: A channel with sliding clamp and rod arrangement for leveling a ladder comprising a base unit of a hollow rectangular shape adapted to fit over the leg of the ladder. The base unit has interior walls spaced apart sufficiently to accommodate the ladder leg. Each of the walls has formed thereon a plurality of spaced splices that slop outwardly and downwardly away from the ladder leg. A clamp member comprises a generally rectangular block that has formed thereon sloping splices that fit into the grooves or spaces between the splices of the base unit. Clamp member has a bore that adjustably and securely retains a support rod, which has a swivel foot at one end. The end of the clamp member that is to be placed adjacent the ladder leg and the opposing interior surface of the base unit have a substantially V-shaped configuration to insure slip free purchase against the ladder leg.
    Type: Grant
    Filed: October 23, 2002
    Date of Patent: June 8, 2004
    Inventor: William T. Smith
  • Publication number: 20040079588
    Abstract: A channel with sliding clamp and rod arrangement for leveling a ladder comprising a base unit of a hollow rectangular shape adapted to fit over the leg of the ladder. The base unit has interior walls spaced apart sufficiently to accommodate the ladder leg. Each of the walls has formed thereon a plurality of spaced splices that slop outwardly and downwardly away from the ladder leg. A clamp member comprises a generally rectangular block that has formed thereon sloping splices that fit into the grooves or spaces between the splices of the base unit. Clamp member has a bore that adjustably and securely retains a support rod, which has a swivel foot at one end. The end of the clamp member that is to be placed adjacent the ladder leg and the opposing interior surface of the base unit have a substantially V-shaped configuration to insure slip free purchase against the ladder leg.
    Type: Application
    Filed: October 23, 2002
    Publication date: April 29, 2004
    Inventor: William T. Smith
  • Patent number: 6702066
    Abstract: A ladder leveling device including a gripping plate having an inner surface and an outer surface. The gripping plate has an elongated central slot therethrough that corresponding with a vertical slot extending through the bottom portion of each ladder leg. The central slot has a pair of threaded bolts adjustably disposed therein and extending outwardly therefrom. The outer surface has gripping teeth disposed thereon. The gripping plate has a plurality of apertures therethrough. The inner surface is positionable against the outside surface of the leg bottom portion with the apertures receiving screws therethrough to secure the gripping plate to the ladder. A leg extension is provided having a generally rectangular configuration, and inner and outer surfaces, the inner surface having gripping teeth disposed thereon. The leg extension has a pair of apertures therethrough in a spaced relationship. The leg extension is adjustably coupled with the gripping plate.
    Type: Grant
    Filed: August 9, 2002
    Date of Patent: March 9, 2004
    Inventor: William Eaton
  • Patent number: 6698550
    Abstract: An adjustable back leg assembly provides a step ladder of simple construction for convenient use on stairs and other sloping surfaces.
    Type: Grant
    Filed: April 4, 2002
    Date of Patent: March 2, 2004
    Inventor: Vernon Crain
  • Patent number: 6655497
    Abstract: A stabiliser for ladders comprises a rigid, generally flat base (10; 71) having a linear channel (11; 70) extending along a first, upper surface thereof, which channel is defined by a pair of generally parallel, upwardly-extending side members having upper edges directed towards each other, and at least one ladder attachment (18, 19; 30, 35; 50, 53) by means of which a ladder stile (17; 66, 67) may be extended downwardly.
    Type: Grant
    Filed: October 3, 2001
    Date of Patent: December 2, 2003
    Inventor: Barrie Weatherall
  • Patent number: 6640932
    Abstract: A ladder stile extender comprises two elongated members (20, 25; 50, 53; 80, 85) one of which is slidable within the other and having means for securing one of the members (20; 50; 80) to a ladder stile and the other of the members (25; 53; 85) functioning as a stile extender or having means to secure it to a stile extension, a set of generally parallel irregularities (23, 24; 52, 59; 83, 84, 91, 90) associated with each of the members for interengagement with those on the other member, means (27, 29; 56, 57; 88, 89) for moving the two sets of irregularities into and out of engagement with each other, and locking means (29; 62; 92) to secure the members together with the sets of irregularities so engaged.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: November 4, 2003
    Inventor: Barrie Weatherall
  • Patent number: 6604607
    Abstract: An A-frame ladder able to be on uneven surfaces, stairs or level surfaces in a stable and level configuration, includes a sliding ladder segment attached to the A-frame ladder segments, locking bars on the sliding ladder segments spaced apart along the sliding ladder segments, sliding bracket mounts attaching each sliding ladder segment to the A-frame ladder segments, and pivoting spring-loaded locking catches securing the sliding ladder segment to the A-frame ladder segments.
    Type: Grant
    Filed: October 17, 2001
    Date of Patent: August 12, 2003
    Inventor: John B. Walden
  • Publication number: 20030034207
    Abstract: A ladder leveling device, the Holding Bracket of which, is hand attachable to the left inner side, the right inner side, the left outer side and the right outer side of all standard extension ladders utilizing proprietary hole location specs., standard nuts and bolts and proprietary conical shims. Leveling is accomplished by dropping a threaded level rod through specified holes in the Holding Bracket and securing in place with an ordinary wing or hex nut.
    Type: Application
    Filed: February 5, 2001
    Publication date: February 20, 2003
    Inventors: R. Park Palmer, Cornelia G. Palmer, R. Park Palmer
  • Publication number: 20020125073
    Abstract: A ladder leveling device including a gripping plate having an inner surface and an outer surface. The gripping plate has an elongated central slot therethrough. The central slot has a pair of threaded bolts adjustably disposed therein and extending outwardly therefrom. The outer surface has gripping teeth disposed thereon. The gripping plate has a plurality of apertures therethrough. The inner surface is positionable against the leg of the ladder with the apertures receiving screws therethrough to secure the gripping plate to the leg of the ladder. A leg extension is provided having a generally rectangular configuration. The leg extension has inner and outer surfaces. The inner surface has gripping teeth disposed thereon. The leg extension has a pair of apertures therethrough in a spaced relationship.
    Type: Application
    Filed: June 11, 2001
    Publication date: September 12, 2002
    Inventor: William Eaton
  • Publication number: 20020053488
    Abstract: The invention is an improvement to an A-frame ladder, adding to an A-frame ladder independent extension means allowing the ladder to be placed on uneven surfaces, stairs or level surfaces in a stable and level configuration, the improvement adding a sliding ladder segment attached to the A-frame ladder segments, locking bars on the sliding ladder segments spaced apart along the sliding ladder segments, sliding bracket mounts attaching each sliding ladder segment to the A-frame ladder segments, and pivoting spring-loaded locking catches securing the sliding ladder segment to the A-frame ladder segments.
    Type: Application
    Filed: October 17, 2001
    Publication date: May 9, 2002
    Inventor: John B. Walden
  • Patent number: 6374947
    Abstract: A ladder leveling device including an upper block portion couplable with respect to a bottom of a ladder leg. The upper block portion has a generally rectangular configuration defined by a closed upper end, an open lower end, a front wall, a back wall and opposed side walls. The front wall has a longitudinal slot formed therein. A lower block portion is coupled with respect to the upper block portion. The lower block portion has a generally rectangular configuration defined by an upper end, a lower end, a front wall, a back wall and opposed side walls. The upper end is slidably received within the open lower end of the upper block portion. The front wall has a bolt extending outwardly therefrom for being positioned within the longitudinal slot of the upper block portion whereupon a nut can be tightened on the bolt to fix a height of the upper block portion with respect to the lower block portion. A glass bubble level is provided that can be secured to the leg of the ladder above the upper block portion.
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: April 23, 2002
    Inventor: Richard Nurkiewicz
  • Patent number: 6237718
    Abstract: A leg extension device for use in levelling a ladder or other work platform requiring a level step, includes a first leg member and a second extending leg member, substantially parallel with, and in slidable relation, thereto. A belt, strap or cable cooperates between the first and second leg members to produce an extendable leg, which can be secured, or fastened, over a range of extended lengths by a clamping arrangement, which is operable on the belt, strap or cable. The clamping arrangement is activated to secure the strap in order to fix the length of the extendable leg, or is released, as required, to allow for a positive adjustment by way of either extension or contraction of the extending leg member to accommodate variations in the terrain on which the ladder is used.
    Type: Grant
    Filed: March 12, 1998
    Date of Patent: May 29, 2001
    Inventor: Gregory John Schwarzel
  • Patent number: 6234710
    Abstract: This invention provides an adjustment length member (100) for fitment to a variety of apparatus including ladders. The preferred form provides two members (1,2) contained in sliding contact one of which (2) has a taper or sloped surface. The members pass through a constriction (3) and a member (21) adjacent, such as a wedge or camming device may be used to adjust the construction to limit the passage of the tapered member through the constriction.
    Type: Grant
    Filed: November 23, 1998
    Date of Patent: May 22, 2001
    Inventor: Vesko Ananiev
  • Patent number: 6234273
    Abstract: A adjustable ladder for leveling a ladder on an uneven surface. The adjustable ladder includes a ladder and leveling system. The ladder has a first leg, a second leg, and a plurality of rungs extending between the legs. A bottom end of the first leg is hollow and defines a cavity therein. An extension leg extends the length of the first leg. The extension leg comprises a housing which is slidably received in the cavity of the first leg and is adapted to selectively move inward and outward of the cavity for increasing and decreasing an effective length of the first leg. A plurality of bores are located in the first wall of the housing. Each of the bores in the first wall has a diametrically opposed and axially aligned bore in a second wall of the housing. A pin for selectively locking the housing in position with respect to the first leg is insertable through a pair of diametrically opposed bores in the first leg.
    Type: Grant
    Filed: December 17, 1999
    Date of Patent: May 22, 2001
    Inventor: Graham Moore
  • Patent number: 5816364
    Abstract: A ladder leveling apparatus 10 including a ladder member 20 having ladder legs 21 that are received in a ladder leg adapter unit 12 including boot members 30 wherein the position of the bottom of the ladder legs 21 relative to the boot members 30 are controlled by elongated adjustment rod members 40 having an enlarged head member 44 which is actuated proximate the upper portion of the ladder member 20.
    Type: Grant
    Filed: July 14, 1997
    Date of Patent: October 6, 1998
    Inventors: Cynthia Christy, Mark Christy
  • Patent number: 5542497
    Abstract: A ladder level adjusting attachment for a ladder of the type having a pair of generally parallel side rails, a plurality of hollow rungs interconnecting the side rails and a pair of shoes, each located on a bottom end of each side rail. The attachment comprising at least one but typically two independent, identical and height adjustable support assemblies. A structure is for installing the support assembly against the side rail of the ladder. Support assembly can be height adjusted independently to allow the ladder to stand in a level and stationary position, with respect to all uneven floor and ground base conditions.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: August 6, 1996
    Inventor: Witold S. Macyszyn
  • Patent number: 5421429
    Abstract: A ladder having legs having lower ends, has a safety foot pivotally connected to each lower end. Each safety foot has a hinge having two plates one of which is secured to the ladder foot and the other of which is secured to the lower end of the ladder leg. One of the hinge plates supports a stop surface that contacts a stop surface supported by the other hinge plate when the foot is at right angles to the ladder leg. The foot is releasably retained in a position parallel to the ladder leg. The releasible retainer is hook and eye fabric one element of which is connected to the lower end of the ladder leg and the other element of which is connected to the foot. The hinge plate is integral with a member that extends along the lower end of the leg, one element of the hook and eye fabric being fixedly secured at one end between this member and the leg and being free at another end thereof. One of the stop surfaces is provided by a member that is L-shaped to surround the hinge.
    Type: Grant
    Filed: May 4, 1994
    Date of Patent: June 6, 1995
    Inventor: John Evans
  • Patent number: 5265699
    Abstract: A ladder guard for a ladder having a pair of side rails and a plurality of rungs is provided which consists of an elongate stanchion. A base has a longitudinal aperture therethrough, so that the stanchion can be inserted through the aperture in the base. A structure is for mounting the stanchion behind a bottom portion of one side rail of the ladder, so that a lower segment of the stanchion will extend downwardly below the bottom portion of the side rail. A mechanism is for locking the base to the stanchion, so that a top end of the base can rest against the underside of the bottom portion of the side rail to stabilize the ladder on an uneven surface.
    Type: Grant
    Filed: April 14, 1993
    Date of Patent: November 30, 1993
    Inventor: Thosarath Phoumisavanh
  • Patent number: 5265698
    Abstract: An extendable stepladder has a pair of front legs and a pair of rear legs (10), first steps for connecting the front legs together and second steps for connecting the rear legs together. A slider (12) which is telescopically arranged on the outer surface of each leg has a cut-out portion (18) thus forming a vertical passage along each leg. The knob (22) is capable of sliding upwardly and downwardly along the cut-out portion. Each slider has a bracket (19) which has an opening (20). When the sliders of the front legs or the rear legs are extended to a length greater than the length of the rear legs or the front legs respectively, the ladder is firmly secured by means of a bolt (24) which is received in an opening in the front and rear legs. Further, a female T-bolt (30) having four prongs (32), and an internally threaded shaft (34) the shaft having a proximal end and an opposite end is provided.
    Type: Grant
    Filed: December 2, 1991
    Date of Patent: November 30, 1993
    Inventor: Warren Friedel, Jr.
  • Patent number: 5232067
    Abstract: An attachment device is provided for use with a ladder having two side stile members and a plurality of hollow rungs connected therebetween for extending at least one of said side stile members so that the ladder can be used on uneven ground. The attachment device comprises an elongated member provided with a longitudinal slot extending lengthwise therethrough, and mounting means for adjustably attaching the elongated member to one of the side stile members. The mounting means includes at least one first crossbar adapted to fit through the slot in the elongated member and to extend through one of the hollow rungs and means for securing opposite ends of the at least one first crossbar to the side stile members.
    Type: Grant
    Filed: December 13, 1990
    Date of Patent: August 3, 1993
    Inventor: Leon E. Griffith
  • Patent number: 5181584
    Abstract: The ladder leveling adapter comprises a pair of spacers adapted to be secured outwardly on the side rails of the ladder between two interconnecting rounds. An elongated bar having a median slot parallel to the rail extends over the spacers and projects below the rails. Each rail and each adjacent elongated bar are connected together by a pair of threaded rods having a nut threadedly mounted on the inner side of the rail and quick release tightening means on the outer side of the bar. A friction means is mounted around each rod between the spacer and the bar for preventing a longitudinal slipping between the bar and the rail. The quick release tightening means comprises a knob axially mounted on the rod having a flat surface abuting on the bar and a lever for slidingly moving the knob against the bar. The knob includes a pin which extends in the slot of the bar for preventing the rotation of the lever relative to the slot, the pin having a length greater than the releasing distance of the release means.
    Type: Grant
    Filed: March 16, 1992
    Date of Patent: January 26, 1993
    Inventor: Yves M. Simard
  • Patent number: 5154257
    Abstract: A ladder apparatus including a plurality of spaced parallel ladder legs, with each ladder leg telescopingly mounting an extension leg relative to each ladder leg to accommodate uneven surface conditions. Interlocking structure is provided to secure each respective extension leg relative to a receiving cylinder relative to each ladder leg.
    Type: Grant
    Filed: September 9, 1991
    Date of Patent: October 13, 1992
    Inventor: Virgil S. Mirles
  • Patent number: 5148892
    Abstract: A quick stand adjusting device for adjusting the height of the stand of a ladder, a chair, an instrument or equipment, comprising a split retainer controlled by a control device, which is comprised of a crank, a transmission rod and a movable stop block, to move in and out of a recessed chamber in a lock socket at the bottom so as to engage or release a support which is extendibly inserted in the stand.
    Type: Grant
    Filed: September 19, 1991
    Date of Patent: September 22, 1992
    Inventor: Ching-Shui Lu
  • Patent number: 5074378
    Abstract: A ladder with extendible legs that may be individually and selectively, secured in the desired extent of protraction by a relatively uncomplicated locking mechanism. The locking mechanism may be incorporated in a ladder having at least a pair of support legs with an extension leg carried by, and slidable axially along, each support leg. A reaction surface is presented from each support leg. A pair of locking cam surfaces is also presented from each support leg. The locking cam surfaces are disposed in spaced opposition to each reaction surface. An engaging plate is presented from each of the extension legs. The engaging plate is slidably interposed between the reaction surface and the opposed locking cam surfaces. A locking member is, in turn, operatively disposed between the engaging plate and the opposed locking cam surfaces.
    Type: Grant
    Filed: January 2, 1991
    Date of Patent: December 24, 1991
    Assignee: Kaddi Corporation
    Inventor: Lewis O. Studer
  • Patent number: 5064024
    Abstract: A ladder leg extender apparatus for attachment to the leg of a ladder to lengthen the leg as required to support the ladder on an uneven support surface. The apparatus comprises a sleeve secured to a shortened leg of the ladder which slidably carries an extendible support leg therein for movement inwardly and outwardly of the sleeve to adjust the length of the leg. Infinitely variable vertical adjustment of the support leg is achieved by (1) loosening two turn bolts which secure the support leg between the bolts on one side and a coarse file on the other side thereof within the sleeve and then (2) tightening the bolts when the support leg is properly slidably adjusted with the associated ladder is in an upright and level orientation.
    Type: Grant
    Filed: March 25, 1991
    Date of Patent: November 12, 1991
    Inventor: Leonard J. Barham
  • Patent number: 5027923
    Abstract: An attachment for a ladder includes a housing and an extensible leg. The housing is clamped to the side of a ladder, and the extensible leg is extended to engage the ground after the ladder has been placed level. A bubble level is provided for visually determining when the ladder is level.
    Type: Grant
    Filed: October 5, 1990
    Date of Patent: July 2, 1991
    Inventor: James N. Derome
  • Patent number: 4995474
    Abstract: A safety ladder is disclosed. The safety ladder comprises at least two legs each of which containing a smooth longitudinal blind bore, a steel hollow pipe having an outer surface and being smoothly disposed in the longitudinal blind bore while providing additional strength to the at least two legs, a rod disposed concentrically in the steel hollow pipe and vacillating up and down therein without any hindrance so that its ease of operation is increased, a solid piece of steel drilled and tapped so as to contain a throughbore that will accommodate the steel hollow pipe, and a flat steel plate affixed to the solid piece of steel and containing a skewly drilled hole so that the skewly drilled hole lines up with the outer surface of the steel hollow pipe.
    Type: Grant
    Filed: January 22, 1990
    Date of Patent: February 26, 1991
    Inventor: Edward Gauthier
  • Patent number: 4844208
    Abstract: A ladder accessory for releasably securing a wooden extension to a leg of a ladder comprises a metal channel member for receiving the ladder extension so as to allow longitudinal sliding adjustment of the extension relative to the channel member. A shaft rotatably mounted in opposed walls of the channel member carries a plurality of gripping pins and has a handle by which the pins can be rotated into indenting engagement with the extension for gripping and retaining the extension relative to the channel member, which is secured by a clamping device to the ladder leg. The handle rests against the extension below the shaft so as to prevent rotation of the shaft by the weight of the ladder.
    Type: Grant
    Filed: January 28, 1988
    Date of Patent: July 4, 1989
    Assignee: 3V Enterprises Inc.
    Inventor: Boyd L. Veness
  • Patent number: 4836331
    Abstract: A device which is easily attached to the stiles of any ladder. This highly reliable device creates a steadfast ladder, removing the fear of the ladder flipping over or slipping out from under. This device is created in such a manner as to be attached to any ladder and also having a clearance to allow for any shoes attached or to be attached to the ladder's base. Ground penetration is easily achieved by the slike's ability to rotate. The design of the device allows ground penetration to any depth, making allowances for obstructions. Safety is achieved by the device's ability to stabilize the ladder's lower end. The handle lies flat against the ladder's stiles creating a self-contained unit that is out of the way when not in use.
    Type: Grant
    Filed: May 12, 1988
    Date of Patent: June 6, 1989
    Inventor: Paul T. Foradori