Reciprocating Tool Patents (Class 451/351)
  • Patent number: 10886827
    Abstract: A linear vibration motor comprising a housing, a stator, an vibrator, and two sets of elastic support assemblies which are located at two ends of the vibrator, respectively, and used for supporting the vibrator and providing elastic restoring forces, wherein each set of the elastic support assemblies comprises at least two elastic supports. Each elastic support comprises a first connection point coupled to the vibrator and a second connecting point coupled to the housing. both the first connection point and the second connection point which are located on the same elastic support are located on the same side of a central axis of the vibrator, and the central axis is parallel to a vibration direction of the vibrator; and the second connection point is coupled onto a side wall, perpendicular to the vibration direction of the vibrator, of the housing. The linear vibration motor of the present invention has a simple structure, is low in assembly difficulty and high in production efficiency.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: January 5, 2021
    Assignee: Goertek Inc.
    Inventors: Chunfa Liu, Fenglei Zu
  • Patent number: 8341793
    Abstract: A dual mode floor scrubber with a square cleaning pad that can rotate in a first mode to achieve a scrubbing operation away from the walls, and reciprocate longitudinally in a second mode adjacent to a wall to remove the sediment next to the wall and corners.
    Type: Grant
    Filed: December 2, 2009
    Date of Patent: January 1, 2013
    Inventors: Freddie Walker, Richard K. Oblesbee
  • Patent number: 8122555
    Abstract: An apparatus for cleaning floor is disclosed, which is capable of maximizing a user's convenience by an automatic operation, minimizing jolt or vibration generated for its operation, and realizing enhanced endurance and safety, wherein the apparatus includes first and second movable members rectilinearly reciprocating along the same straight line in opposite directions with each other.
    Type: Grant
    Filed: September 3, 2008
    Date of Patent: February 28, 2012
    Inventor: Yong Wook Kim
  • Patent number: 7867065
    Abstract: The present invention is based on a hand-held power tool with a housing (12), an oscillating body (18) provided for oscillation relative to the housing (12), and connecting means (22) which fasten the oscillating body (18) to the housing (12). It is provided that the connecting means (22) include a receiving part (26) which can be installed in the housing (12) and an oscillating element (28) which is separate from the receiving part (26) and is provided for deformation.
    Type: Grant
    Filed: January 5, 2006
    Date of Patent: January 11, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Andreas Heber, Arne Timcke
  • Patent number: 7695352
    Abstract: The invention discloses a tool having a work plate which has a mounting area with a mounting opening for mounting the plate on a drive shaft of a drive, preferably an oscillatory drive, the mounting opening being suitably configured for being seated on the drive shaft, wherein centering elements, projecting toward the drive shaft, are provided for centering the tool on the drive shaft.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: April 13, 2010
    Assignee: C. & E. Fein GmbH
    Inventor: Hermann Schumacher
  • Patent number: 7416478
    Abstract: A planetary drive head for treating floors having a hub that rotates in one direction and attached media gears that rotate in the opposite direction.
    Type: Grant
    Filed: October 4, 2006
    Date of Patent: August 26, 2008
    Inventor: Raymond E. Vankouwenberg
  • Patent number: 7247085
    Abstract: A combined floor edger and grinder having a grinding disk which can be adjusted from engaging the floor while flat to engaging the floor along a front, back or side edge of the disk, depending on the height adjustment of the wheels on either side of the frame. The wheels, shroud and handle can also be adjustable relative to the frame for moving the frame straight back and forth or at an angle such that with the disk adjusted to engage the floor on one side of the frame the wheels and handle can be adjusted such that they are angled with respect to a wall for use as an edger whereby a user can push the device along the edge of a wall in a straight line while edging. The shroud and disk sizes may be easily changed for different jobs. The shroud can be open or close ended.
    Type: Grant
    Filed: March 15, 2005
    Date of Patent: July 24, 2007
    Assignee: National Carpet Equipment, Inc.
    Inventor: Martin L. Anderson
  • Patent number: 7226348
    Abstract: An improved structure of an air sander grinder with air chamber mounting and eccentric mounting, and the cylinder air chamber mounting is placed inside the air sander grinder, and an air chamber is placed in the center of the air chamber mounting the sides of which has air inlet and air outlet openings the eccentric mounting includes a mandrel and an eccentric component, and the top of the mandrel has a drive section that is placed in the air chamber of the air chamber mounting, and the bottom of the mandrel has a linkage section connected with the eccentric component; the feature of the present invention is that the air chamber mounting is made by the inner metal ring with an outer plastic ring on the outside; the mandrel of the eccentric mounting is metal mandrel, and the eccentric component is a plastic eccentric component; the eccentric component is formed at the bottom of the metal mandrel.
    Type: Grant
    Filed: October 7, 2005
    Date of Patent: June 5, 2007
    Inventor: Tse-Hua Chang
  • Patent number: 7155768
    Abstract: An electric-motored floor-surface polisher includes a pair of pads juxtaposed in the front and rear or lateral direction of an apparatus frame, each pad being slidably supported to the apparatus frame. A drive pulley coupled to an output shaft of an electric motor to be rotated therewith.
    Type: Grant
    Filed: August 13, 2003
    Date of Patent: January 2, 2007
    Assignee: Penguin Wax Co., Ltd.
    Inventors: Isao Morita, Yasuhiro Ueda
  • Patent number: 7056199
    Abstract: The present discovery refers to a connecting foot for a machine constituted by a central cylinder of hard plastic material, possibly fitted with a hole, coaxial to said central cylinder, and by an external coating of rubber. Said rubber also fills the hole forming a rod that connects the two heads of the external coating. The external coating of the foot is constituted by a single piece that completely covers the internal cylinder. An orbital sanding machine is also described, comprising a machine body that supports a motor for the rotation of a vertical shaft, a rotative-orbital plate connected eccentrically to said shaft by means of an eccentric hub in relation to the axis of the shaft and elastic connecting feet between the operating plate and the machine body.
    Type: Grant
    Filed: February 11, 2004
    Date of Patent: June 6, 2006
    Inventor: Guido Valentini
  • Patent number: 7018280
    Abstract: A belt sander (2) comprising a housing (4) and having a lower sanding surface (40) and an upper sanding surface (42) opposite the first sanding is disclosed. The sander has a larger rear roller (32) driven by a motor (22), a front roller (34) of smaller diameter than the rear roller, and an endless sanding belt (38). A guard (48) is pivotable between a lowered position preventing access to the upper sanding surface and a raised position allowing access to the upper sanding surface. A handle (12) on the housing is pivotable between a first handle position adjacent the upper sanding surface and at least one second handle position further from the upper sanding surface than the first handle position.
    Type: Grant
    Filed: September 1, 2004
    Date of Patent: March 28, 2006
    Assignee: Black & Decker Inc.
    Inventor: Andrew Walker
  • Patent number: 6935936
    Abstract: Hand held abrading tools are disclosed. The abrading tools include clamping mechanisms to quickly and reliably secure sanding paper, bristled sheets, polishing cloths, and the like, to the tool, while at the same time providing the operator with increased agility and ability to reach relatively hard to reach or oddly shaped surfaces.
    Type: Grant
    Filed: September 29, 2003
    Date of Patent: August 30, 2005
    Assignee: Newell Operating Company
    Inventors: Matthew G. Goulet, Craig S. Serio, Michael M. Potempa, Brian S. Potempa, Tong Jin Kim, Michael H. Reedy, Michael D. Prince
  • Patent number: 6866570
    Abstract: A non-rotary, linear reciprocating floor sander includes a housing having a bottom opening, wherein a rotating electric motor is supported by the housing. A vertical output shaft extends within the housing and engages gears controlling a pair of flat platens enclosed above and on sides by the housing. The platens have lower surfaces with bonded sandpaper pads adapted to be in contact with a floor to be sanded. The vertical output shaft controls reciprocating movement of the platens linearly in a plane in opposite directions, so that the platens move toward and away from each other, thereby reducing little induced force or vibration transmitted to the housing.
    Type: Grant
    Filed: May 9, 2003
    Date of Patent: March 15, 2005
    Inventor: John P. Hunter, Jr.
  • Publication number: 20040224620
    Abstract: A non-rotary, linear reciprocating floor sander includes a housing having a bottom opening, wherein a rotating electric motor is supported by the housing. A vertical output shaft extends within the housing and engages gears controlling a pair of flat platens enclosed above and on sides by the housing. The platens have lower surfaces with bonded sandpaper pads adapted to be in contact with a floor to be sanded. The vertical output shaft controls reciprocating movement of the platens linearly in a plane in opposite directions, so that the platens move toward and away from each other, thereby reducing little induced force or vibration transmitted to the housing.
    Type: Application
    Filed: May 9, 2003
    Publication date: November 11, 2004
    Inventor: John P. Hunter
  • Patent number: 6739957
    Abstract: A surface abrader apparatus includes a casing, a motor mounted on the casing, one or more working tools, and an operating mechanism mounted to the casing and supporting the working tools outside of the casing. The operating mechanism is drivingly coupled to the motor for causing an impacting movement of the working tools against a workpiece in response to selected operation by the motor. The operating mechanism includes one or more elongated shafts reciprocally mounted in the casing parallel to one another and having same one ends extending from the casing, a drive shaft rotatably mounted in the casing between and parallel to the shafts and rotatably driven by the motor, and coil springs and cam elements for causing lifting and releasing of the shafts and the working tools, such as impact abrading heads, mounted on the same one ends of the shafts to produce impact movements of the tools.
    Type: Grant
    Filed: December 3, 2002
    Date of Patent: May 25, 2004
    Inventors: Clayton R. Peterson, Steve Sanders
  • Publication number: 20040014410
    Abstract: A power grinder, in particular an oscillating grinder (10), having a housing (12) and a grinding sheet holder (14), on whose working face (15) a grinding sheet (16) to be received is braced, and its reception is effected by means of clamping means (20, 23) that lock opposite grinding sheet ends (17, 19) to the grinding sheet holder (14), is made easier to operate, and its machining capacity is improved, by providing that for equipping it with the grinding sheet, the clamping means (20, 23) are movable jointly with a grinding sheet end (17) clamped to them away from the opposite, likewise clamped grinding sheet end (19), so that the latter is locked, while under tensile stress.
    Type: Application
    Filed: April 3, 2003
    Publication date: January 22, 2004
    Inventors: Sabine Bocka, Marco Balmeli
  • Patent number: 6663467
    Abstract: An abrading composition and a process for abrading factory pre-finished surface coverings, wherein the abrading composition comprises an effective amount of wear-resistant particles, a rheology modifier, and a solvent. This invention further relates to a process to abrade wood floor surfaces and factory pre-finished wood floor surfaces, as well as a process for refinishing a factory pre-finished wood floor using the abrading composition.
    Type: Grant
    Filed: January 10, 2003
    Date of Patent: December 16, 2003
    Assignee: The Sherwin-Williams Company
    Inventors: George R. Mayerhauser, William J. Fernandez, Jr., Michael T. Triolo, Robert P. DeHart
  • Patent number: 6659851
    Abstract: A fastening device for a polishing paper cloth of a portable polishing machine. The device comprises an attaching portion which can be detachably attached to a base plate of the polishing machine and a fastening device main body for winding the polishing paper cloth thereon to engage therewith. Multiple concave grooves, which are continuous in the winding direction of the polishing paper cloth in parallel, and a cavity portion formed inside are provided. Therefore, by giving flexibility to the main body to allow it to be deformed in many directions, it is possible to prevent a reaction to the operator due to oscillation of the polishing machine generated during the polishing and to improve a discharging function for the polishing waste to the outside by allowing the polishing waste generated during the polishing to easily intrude in the concave grooves.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: December 9, 2003
    Assignee: YKK Corporation
    Inventors: Yoshinobu Takahashi, Toshiaki Takizawa, Ryuichi Murasaki
  • Publication number: 20030104774
    Abstract: A surface abrader apparatus includes a casing, a motor mounted on the casing, one or more working tools, and an operating mechanism mounted to the casing and supporting the working tools outside of the casing. The operating mechanism is drivingly coupled to the motor for causing an impacting movement of the working tools against a workpiece in response to selected operation by the motor. The operating mechanism includes one or more elongated shafts reciprocally mounted in the casing parallel to one another and having same one ends extending from the casing, a drive shaft rotatably mounted in the casing between and parallel to the shafts and rotatably driven by the motor, and coil springs and cam elements for causing lifting and releasing of the shafts and the working tools, such as impact abrading heads, mounted on the same one ends of the shafts to produce impact movements of the tools.
    Type: Application
    Filed: December 3, 2002
    Publication date: June 5, 2003
    Inventors: Clayton R. Peterson, Steve A. Sanders
  • Patent number: 6494773
    Abstract: A border planing machine for wood floors comprising a footing provided with wheels and a handle, a structure which is hinged to the footing so as to rotate about a longitudinal axis and adapted to support abrasive disks on either side with respect to the longitudinal axis and to support elements for moving the disks so that the disks arranged on one side rotate in the opposite direction with respect to the disks arranged on the other side, and levers adapted to determine, following an actuation on the part of the operator, small rotations of the structure with respect to the longitudinal axis, in both directions.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: December 17, 2002
    Inventors: Claudio Marchini, Raffaele Migliari, Riccardo Zanchetta
  • Patent number: 6468141
    Abstract: A drywall sander comprises a handle, a sanding head adapted to being reciprocated for back and forth motion, a moving coil actuator associated with the sanding head for reciprocating the sanding head, and a universal joint for connecting the handle to the moving coil actuator.
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: October 22, 2002
    Inventors: John S. Conboy, Gerald E. Amies
  • Patent number: 6231432
    Abstract: A floor treatment machine with a torque limiter assembly between a rotating drive linkage and a rotating head for treating a floor surface. The torque limiter assembly includes engaged plates that disengage upon the application of a predetermined torque created when the head slows or stops rotating because of a floor obstruction. Upon the disengagement of the plates, the drive linkage continues to rotate and is less likely to sustain damage from the effect of the floor obstruction on the rotation of the head. The plates may engage each other through a configuration of cooperating teeth and notches. Alternatively, a rotating head can be provided with a built-in torque limiter assembly. This head can be attached to various floor treatment machines. The amount of predetermined torque that causes the plates to disengage may be adjusted as needed for varied floor conditions.
    Type: Grant
    Filed: November 12, 1999
    Date of Patent: May 15, 2001
    Assignee: Pearl Abrasive Company
    Inventors: Clay Peterson, Michael A. Jackola
  • Patent number: 6132299
    Abstract: A linear sanding apparatus, for providing a linear reciprocating sanding action, and having a support assembly, a drive shaft, and having a angled drive plate on the shaft, and a motor for rotating the shaft, two transmission devices coupled to the drive plate, and operable by rotation of the drive plate, to reciprocate along linear paths in opposite directions side by side to one another, and first and second sanding plates connected to respective transmission devices, and movable in unison with movement of the devices to and fro, side by side to one another along reciprocating linear parallel paths in opposite directions.
    Type: Grant
    Filed: April 19, 1999
    Date of Patent: October 17, 2000
    Inventor: James Nil Tasikas
  • Patent number: 6116995
    Abstract: An object of the present invention is to provide an apparatus which is suitable for sharpening the drill bits of both the power drill and hand drill. Additionally, the operation of said apparatus is simple, and the sharpening is accurate.
    Type: Grant
    Filed: May 10, 1999
    Date of Patent: September 12, 2000
    Inventor: Yu Yi Chao
  • Patent number: 6039639
    Abstract: A motor driven hand tool has an oscillatory work tool carrier (10) that is attached by means of elastic supporting members (11 to 14) to the housing. Each elastic supporting member (11 to 14) includes a one-piece plastic part consisting of approximately rod-shaped spring elements (20 to 25) and transversely extending base parts at opposite ends of the spring elements. At least one damping part (29) may be provided extending between the spring elements (20 to 25) and bears on or is supported between both base parts (15,26). The base parts of the one-piece plastic part contact on respective facing surfaces of and are formed for releasable attachment with the hand tool housing and the work tool carrier.
    Type: Grant
    Filed: February 20, 1998
    Date of Patent: March 21, 2000
    Assignee: Robert Bosch GmbH
    Inventor: Julian Pfaundler
  • Patent number: 6007414
    Abstract: A polishing machine consists of a housing to which a handle is fastened pivotally. A motor is mounted in the interior of the housing such that an output end of the motor is fastened with a linking mechanism. Two reciprocating members are fastened pivotally with the housing such that the reciprocating members are actuated by the linking mechanism to engage in a linear reciprocating motion. Two rubbing members are fastened respectively with the two reciprocating members such that the rubbing members are capable of rubbing a surface in a linear reciprocating manner.
    Type: Grant
    Filed: May 13, 1998
    Date of Patent: December 28, 1999
    Inventor: James Tsai
  • Patent number: 6004194
    Abstract: In a hand-held electrical grinder with a tool holder (22) driven by a rotating eccentric plug (20) which, for receiving a grinding tool has a quick-action locking device (24) with locking elements (40, 41) fixed on the tool and tool holder sides and corresponding with each other, the locking elements (40) on the tool side are formed, on the one hand, by hooks (42) disposed on a circular line and, on the other hand, the locking elements (41) on the holder side are realized by means of a spring wire (43), which is bent in the shape of a ring, in order to transmit a greater output from the tool holder (22) to the (10). The spring wire (43) has a number of radially inward directed indentations (431) corresponding to the number of the hooks (42) on the tool side, which extend behind the hooks (42) on the tool side for locking the grinding tool (10) in.
    Type: Grant
    Filed: October 6, 1997
    Date of Patent: December 21, 1999
    Assignee: Robert Bosch GmbH
    Inventors: Eugen Hild, Joao Bergner, Rudolf Fuchs
  • Patent number: 5904612
    Abstract: A surface treating device includes a tubular blasting case member having a main open face and a sub-open face. A suction-adhering seal engages the blasting case to seal a space defined between the blasting case and the surface of the object being treated. Sand, water, or other abrasive material is ejected through a nozzle and the blasting case, toward the surface being treated. A flat belt or plate, which includes a nozzle opening, engages the sub-open face of the blasting case and covers the blasting case opening. A surface of the flat belt member is brought into sealing contact with a surface of the sub-open face due to a difference in pressure between an inside and an outside of a pressure reduction space such that the blasting case opening is completely covered and sealed while the flat belt member reciprocatingly moves along with the nozzle.
    Type: Grant
    Filed: May 6, 1997
    Date of Patent: May 18, 1999
    Inventor: Fukashi Urakami
  • Patent number: 5833014
    Abstract: About a rigid longitudinal extension a sleeve is frictionally suspended such that the extension may reciprocate freely within the sleeve while remaining relatively stationary longitudinally. The rear end of the extension is attachable to a reciprocating portable power tool and the forward end is attached to a tool head. In operation, the extension and the tool head reciprocate while the sleeve, grasped in one hand, is frictionally isolated from the reciprocation and consequently insulated from the vibration associated with the operation of a portable reciprocating portable power tool. A coupling upon the forward end of the extension facilitates the attachment of a variety of different tool ends. Frictional suspension of the sleeve about the extension by using a pair of springs or by using bearings between the sleeve and the extension is suggested.
    Type: Grant
    Filed: March 18, 1996
    Date of Patent: November 10, 1998
    Inventor: Herbert Dunn
  • Patent number: 5807169
    Abstract: The invention provides a braking system for a powered oscillating hand tool which tool comprises (i) a housing; (ii) a drive unit (2) having an electric motor (4) and a drive shaft (8); (iii) a bearing (28) mounted on the drive shaft (8) and located radially eccentrically relative to the drive shaft (8), adapted to drive a second drive shaft (26); (iv) means (22) for mounting an oscillating head (24) on the second drive shaft (26) and (v) brake means (30) for providing braking between the oscillating head (24) and the housing (6). The brake means (30) comprises (i) a reaction surface (35, 46); (ii) a resilient support member (32, 40) formed from a resilient material which material, under compression, provides a resultant load on the contact surface and (iii) an abrasion resistant contact layer (34, 44) mounted on the support member (32, 40).
    Type: Grant
    Filed: November 21, 1995
    Date of Patent: September 15, 1998
    Assignee: Black & Decker Inc.
    Inventors: Michael Martin, Colin Pugh, Daniel Bone
  • Patent number: 5749770
    Abstract: The present invention provides a new and improved sanding apparatus which includes a flexible tubular member having an outer abrasive surface and a plurality of contour members adapted to be received one-at-a-time within the tubular member. The invention also includes the method of sanding by using the flexible tube and a plurality of the contour members.
    Type: Grant
    Filed: July 8, 1996
    Date of Patent: May 12, 1998
    Assignee: S-B Power Tool Company
    Inventors: Albert I. Uzumcu, Matthew Malone, Russell J. Schweizer
  • Patent number: 5716263
    Abstract: A device for cleaning, polishing or sanding having a treatment head that linearly reciprocates a pad or brush with a purely translational motion. The treatment head has a driven shaft with a crank at a free end connected through a link to a sliding block. The sliding motion of the block is confined in rails fixed on opposite sides of the driven shaft. A mechanism is provided for connecting the driven shaft to an output shaft of an electric motor.
    Type: Grant
    Filed: March 8, 1996
    Date of Patent: February 10, 1998
    Inventors: William C. Jones, Jean K. Jones
  • Patent number: 5681213
    Abstract: A sanding tool for grinding a workpiece to be worked has a housing in which an electric motor is accommodated and a grinding assembly operatively connected to an output shaft of the electric motor to be swingable to perform a grinding operation, and the grinding assembly comprises a driving plate operatively connected to the output shaft of the electric motor to be swingable, a grinding plate attached to the driving plate to grind the workpiece and a member for operatively connecting the driving plate and the grinding plate such that the grinding plate is changed in an attaching position thereof in a plane parallel to a surface of the workpiece to be ground. First and second engaging members are formed to the grinding plate and the driving plate, respectively, for achieving an engagement therebetween when the grinding plate is pushed against the driving plate, and when the first and second engaging members are engaged, the rotational motion of the grinding plate to the driving plate is restricted.
    Type: Grant
    Filed: May 15, 1996
    Date of Patent: October 28, 1997
    Assignee: Ryobi Limited
    Inventor: Toshimitsu Hashii
  • Patent number: 5658193
    Abstract: A hand tool for performing an axially reciprocating operation on a workpiece includes a rigid drive member having a longitudinal axis and a coupling formation for releasably securing one of a plurality of task-specific attachments, the coupling formation configured for engaging the attachments along the axis, and a handle portion operatively connected to said the member for grasping by a user to apply force to a workpiece through the drive member to perform an operation thereon. The drive member may be reciprocated manually or by a motorized mechanism. The coupling portion of the drive member secures the attachment against unwanted axial movement. The attachment exerts a clamping force on the drive member.
    Type: Grant
    Filed: April 18, 1994
    Date of Patent: August 19, 1997
    Assignee: Wahl Clipper Corporation
    Inventor: James E. McCambridge
  • Patent number: 5637034
    Abstract: An oscillating tool for sanding a surface has a body (12) defining an internal cavity (14) and a motor (20) located therein The motor has a motor shaft (22) oriented in parallel with the body. A crank (24) is affixed to the motor which has a crank pin (26) projecting therefrom. A lever arm (34) is pivotably affixed to the body for rotation about a pivot axis generally perpendicular to the motor shaft. The lever arm cooperates with the crank pin to cause the lever arm to cyclically pivot back and forth. A pad support (18) is adapted to receive a work member (19). The planar pad support is affixed to the lever arm at a location spaced apart from the pivot axis and oscillated therewith. The pad support has a substantially 90 degree forward corner (110) formed by a pair or facet edges and a pair of outwardly inclined straight side edges (116, 118).
    Type: Grant
    Filed: April 10, 1995
    Date of Patent: June 10, 1997
    Assignee: Ryobi North America, Inc.
    Inventors: Robert G. Everts, Nobuto Kai, John E. Nemazi, Kenneth M. Brazell
  • Patent number: 5511271
    Abstract: A vibration type floor sweeper comprising a mounting frame; a motor mounted on the mounting frame; at least two movable supporting points; and a pad or brush having an overall square-shaped configuration movably mounted on a bottom surface of the mounting frame through the movable supporting points, the pad or brush being horizontally vibrated by eccentric operation of the motor.
    Type: Grant
    Filed: July 20, 1994
    Date of Patent: April 30, 1996
    Assignee: Amano Corporation
    Inventors: Osamu Shishido, Yuichi Terada
  • Patent number: 5494476
    Abstract: A protective guard for use on a pneumatic tool known as a board file which includes a handle assembly and a board assembly that reciprocates back and forth relative to the handle assembly. The board assembly is held together by a nut and bolt located near each end thereof, and the handle assembly consists of a front handle and a rear handle mounted on a housing. A pinch point exists between a forward end of the housing and the forwardmost nut and bolt that holds the board assembly together. The protective guard is mounted on the handle assembly and prevents injury to an operator by preventing his fingers or the side of his hand from inadvertently slipping into this pinch point. A platform on the protective guard covers the forwardmost nut and bolt as the board assembly reciprocates relative to the handle assembly.
    Type: Grant
    Filed: December 2, 1994
    Date of Patent: February 27, 1996
    Inventor: Andrew G. Crawford
  • Patent number: 5345724
    Abstract: An improved sanding device is provided for various work surfaces which consists of an elongate wedge. Abrasive material is applied to work contact sides of the wedge. A mechanism is attached to a back end of the wedge, for vibrating the wedge with the abrasive material. The abrasive material can be used on V-shaped slats, bi-fold doors, shutters, casing, ornamental work and similar articles.
    Type: Grant
    Filed: April 14, 1993
    Date of Patent: September 13, 1994
    Inventor: Patrick M. Ng, Jr.