Abstract: A lifting jack for automobiles has an extension arm with a particular fastener which may be used to connect longitudinally elongated tubular sections. A series of interlocking sections are provided which need not be identical (e.g. in particular having different ends). The sections are linked in a positive lock (snap fit) by a fastener having one or more resilient legs biasing a lug.

Abstract: A socket tool for releasable securement to a wrench having a drive wheel provided with a drive opening. The tool includes a fastener-receiving part defining therein a fastener-receiving opening for nonrotatable driving engagement with a conventional fastener such as a nut or bolt head. A drive part is fixed to and projects axially from the other end of the fastener-receiving part, and is defined by an annular wall having an interior peripheral wall which defines an interior opening which projects axially through the drive part and coaxially communicates with the fastener-receiving opening. The drive part has an exterior peripheral wall of polygonal shape for nonrotatable driving engagement within the drive opening of the wrench. A ball detent arrangement is mounted on the drive part, and includes a bore formed radially through the annular wall and a ball movably disposed therein.

Abstract: A strut construction having outer and inner telescoping strut members capable of relative extending and collapsing movements. The outer strut member has a socket for a locking piece which is captive but moveable therein. A release member is captive and slidable on the strut construction between locking and release positions. The release member has spaced-apart shallow and deep internal pockets for respectively receiving, depending on its locking or releasing position, portions of the captive locking piece in the outer strut member. The inner strut member has a shoulder which provides shallow and deep pockets to respectively receive other portions of the captive locking piece.

Abstract: The swivel joint for a support arm adjustably receiving an appliance, lighting fixture or the like, in which hoses, cables, lines or the like can be passed through the support arm and the swivel joint and can be fixed to the swivel joint and to the support arm; the swivel joint has two joint shells (3, 4), which are limitedly rotatable about a common axis (2) and are held together axially, each having one tubular outrigger arm (5, 6) for connection to one support tube segment (7) each, and both joint shells (3, 4) can be released by an actuation element (8) to move them into various rotary positions and can be locked in the particular rotated position.

Abstract: An adjustable forearm crutch, wherein the fork support is formed with a central reinforcing rib for increasing the bending-resistant strength of the fork support, the reinforcing rib and the adjacent wall of the fork support defining a recess. After the fork support is molded, the recess can serve as a standard face for the processing procedure so that when punching holes on the fork support, no deflection will take place. The fork support and fixing tube being inserted in through holes of a sleeve member so that the waste chips and water produced when processing the fork support can be easily removed. The through hole of the sleeve member for receiving the fixing tube is formed with an annular groove which provides a resilient clamping effect, the end of which is cut into several equal sections for providing resilient clamping effect, so that the adjusting tube is firmly supported at two points without loosening or swinging.

Abstract: A movable member positioning mechanism in which the number of components of lock and click mechanisms is decreased, and the number of assembling steps is decreased accordingly.

Abstract: A strut construction having outer and inner telescoping strut members capable of relative extending and collapsing movements. The outer strut member has a socket for a locking ball which is captive but moveable therein. A release collar is captive and slidable on the outer strut member between locking and release positions. The release collar has spaced-apart shallow and deep internal pockets for respectively receiving, depending on its locking or releasing position, portions of the captive ball of the outer strut member The inner strut member has a shoulder means which provides shallow and deep pockets to respectively receive other portions of the captive ball.

Abstract: A linear spacing device has first and second elongated components, which may be telescoping hollow tubes, each having linear surfaces engaging each other in sliding relationship. Each component has spaced holes disposed at regular linear intervals along its length. The intervals between the holes through the second component are different than the intervals between the holes through said first component. A pin or similar means is insertable through selected aligned holes through the first and second components to secure them in a selected orientation. Thus the overall length of the spacer can be adjusted in small increments substantially less than the diameter of the holes. The device further includes an extendable linear actuator engageable with a surface of each of the components to extend the overall length of the spacer. The actuator is removable from the device after the components are secured together.

Abstract: A handlebar mounted to a snowmobile framework has an accessory bar secured spanning opposed legs of the handlebar, wherein the accessory bar is arranged to include a heating coil selectively operative to effect heating of an exterior sheath of the accessory bar organization.

Abstract: A lifting jack for automobiles has an extension arm with a particular fastener which may be used to connect longitudinally elongated tubular sections. A series of interlocking sections are provided which need not be identical (e.g. in particular having different ends). The sections are linked in a positive lock (snap fit) by a fastener having one or more resilient legs biasing a lug.

Abstract: A collapsible and adjustable tripod for support of a camera or other apparatus is disclosed. The tripod includes a central column having three sides, each side having a channel longitudinally formed therein. Three leg assemblies, each comprising a leg member and a brace, unfold to support the tripod and collapse to a closed position within the channel in each side of the central column. A first latch mechanism associated with each leg assembly allows the top of each leg member to be slidable within each channel and lockable in a series of positions within each channel. Each brace is pivotably mounted to the bottom of the central column. A second latch mechanism allows the opposite end of each brace to be slidable along the leg member and lockable in a series of positions on each leg member. A neck telescopically extends from the top of the central column. A third latch mechanism allows the neck to be lockable in a series of positions above the top of the column.

Abstract: A tool reach extender includes a pair of elongated, telescopically coupled, first and second, extension members and a locking assembly for releasably locking the members in a selected position. The second member is slidably received within the first member and also includes a locking hole defined therein. The preferred locking assembly includes a tubular housing coaxially mounted to the first member supporting a transversely shiftable locking pin for receipt in the locking hole for locking the members in a selected relative position.

Abstract: A pipe hanger in which the height of a suspended pipe can be adjusted comprises a telescoping hanger rod having a first section and a second section which slides within the first section and a means for securing the two sections in a fixed relation to one another. The first section has at least one pair of diametrically opposed holes and the second section has sets of diametrically opposed holes running axially along its length. A pair of manually operable keys is pivotally attached to a ring which fits snugly around the first section. At one end of each key is a locking plunger which, when inserted into aligned holes in the two sections, maintains the two sections in a fixed relationship. The height of a suspended pipe can easily be adjusted by disengaging the plungers from the holes and sliding the second section of hanger rod within the first section until a new set of holes in the second section are aligned with the holes in the first section.

Abstract: A sealing beam comprises a longitudinal succession of elements disposed between two grate layers made up of a longitudinal succession of alternately fixed and mobile (in longitudinal reciprocation) bars. Each element comprises an I-shaped armature with a web between a lower flange forming a baseplate and an upper flange forming a roof and two U-shaped profile rubbing members with a base bearing on the edge of the corresponding grate layer. Springs passing through holes in the web of the armature urge the rubbing members against the layer edges to compensate for their thermal expansion. The armature and the rubbing members are manufactured by welding to achieve adequate sealing between the rubbing members and the armature.

Abstract: A telescopic construction includes a first tubular section provided with an axially extending slot and a guide seat having a central through hole and an inclined guide notch extending downward from a top side of the guide seat and communicated with the central through hole. The first tubular section extends into the central through hole such that an upper portion of the axially extending slot directly faces the inclined guide notch. A second tubular section is slidably disposed inside the first tubular section and has a radial hole aligned with the axially extending slot. A positioning member, disposed inside the second tubular section, has a stud biased to project through the radial hole and the axially extending slot. The stud engages the inclined guide notch and an upper end of the axially extending slot when the second tubular section is expanded from the first tubular section.

Abstract: A reclining seat back assembly for a wheelchair includes a frame member having a pair of side posts pivotally connected to the wheelchair chassis. Each side post has a rearwardly extending handle at its upper end. A pair of extendable struts each include a hollow outer strut member pivotally connected to the chassis and an inner strut member pivotally connected to one of the side posts and received in the outer strut member. The struts contract as the seat back is pivoted toward a reclined position and extend as the seat back is pivoted toward an upright position. Mounted on each outer strut member is a locking mechanism that includes an engaging member having a first engaging surface with a profile complementary to a second engaging surface on the lower end of the inner strut member. A spring biases each engaging member into engagement with its respective inner strut member.

Abstract: An improved carpet stretching tool of the knee-kicker type is disclosed in which outer and inner overlapping, slidably adjustable shank members connect and space a carpet gripping head having a spike plate and a plurality of cotton head sections and a knee plate. A locking system is provided in which the relative positions of the shank members can be adjustably fixed thereby fixing the height of the tool. The locking system employs several teeth integral with the outer shank member and adapted to mesh against mating protuberances integral with the inner shank member and a resilient member to urge the teeth against the protuberances. The teeth have a small amount of negative rake pitch matched by the protuberances to produce a positive wedging of matching inclined planes. The tool also has an improved and simplified carpet gripping cotton head system which employs an unique cotton head assembly and spike plate control system.

Abstract: An improved opening lock for use in a sunshade or a parasol which is housed in a cavity defined on the shaft of the sunshade. The present opening lock has a stop block having a smoothly curved guide bottom at the front end and a bias spring disposed behind the stop block and a fixing element for mounting the spring, and a cover plate which confines the stop block and the spring and the fixing element inside the cavity so that the runner of the sunshade slidably disposed on the shaft is able to move against the lock, pushing the lock into the cavity when the runner traveling upward to make the sunshade open, and the stop block is able to pop out when the runner passing the same and to support the runner in place, keeping the sunshade opened. To close the sunshade, the stop lock must be pushed into the cavity to permit the runner slide downward.

Abstract: An adjustable stand apparatus includes a platform for holding tools and parts for a user. The platform includes a resilient magnetic pad to maintain such tools and parts, particularly those containing ferrous materials, in a relatively fixed location until used. The platform is adjustable vertically, horizontally, and angularly to maximize user accessibility to such tools and parts. The apparatus is mounted on a mobile base, affixed to the side of an existing tool cabinet, or the like.

Abstract: A pool skimmer of the invention includes a pair of rectangular frames hinged together along adjacent first short frame members by a plastic hinge member extending substantially the length of the short frame members, a pair of poles attached at an intermediate position along each of the short frame members and a net held by each of the frames. The pool skimmer is almost as wide as the pool being skimmed. The hinged frames are folded together when the skimmer is not being used. In use, the skimmer is unfolded and two operators, each holding a pole, position the skimmer in the water at one end of the pool and walk along opposite sides of the pool with the skimmer in the water between them. At the other end of the pool, the skimmer is removed from the water, debris collected in the net is emptied and the skimmer is folded for storage.

Abstract: Handebars 50 contains one or more swivels 10. Swivel 10 are typically mounted between handelbar segments 11 and 12, and between segments 13 and 11 . Each swivel 10 comprises an inner tube 23, spring loaded buttons 28, adapter tube 31 and outer tube 25. Inner tube 23 is free to rotate within outer tube 25 only when buttons 28 are depressed.

Abstract: A snap lock will hold in assembled relationship two tubular parts one within the other in telescopic relationship. The locking mechanism has a rectangular base with rectilinear outer ends and a button urged by a spring perpendicularly away from the base. The base will slide within tracks along the inner walls of the male tubular part and the button will project through an aperture in the wall of the male part which is complementary to the shape of the button. The female tubular member has an aperture in its walls which is also complementary to the shape of the button such that the button will project into the aperture in the female member when one aperture is aligned over the other.

Abstract: The disclosure relates to a crutch which is readily disassembled into a plurality manageable components which can be conveniently tucked away when not in use. The components can be easily adjusted to accommodate persons of different heights. A significant safety feature of the disclosure is the fact that each of the two release subassemblies is provided with a release pin sleeve that ensures a quick and efficient release of the release pin and subsequent re-engagement without the release pin hanging-up and thereby preventing injury to the user. A first embodiment discloses the height adjusting support member receiving both the upper and lower support members therein, while the second embodiment discloses the height adjusting member receiving only the upper support member therein with the lower support member receiving the height adjusting member therein.

Abstract: A telescopic wrench extensioner includes a tubular member with a closed end portion that has a polygonal axial recess which is adapted to engage a socket wrench, and a shaft member having a first end slidably extending into the tubular member and a second end extending out of the tubular member and being provided with an axial socket operating portion that is polygonal in cross section and that is adapted to engage a wrench socket. The shaft member can be maintained at a selected position relative to the tubular member.

Abstract: The invention provides an easily assembled connector for handle sections of a wheeled appliance in which the connector is formed from a plastic having an agressive memory for enabling a pair of opposed tab members thereon formed from the same material to cooperate with respective apertures in the handle members to be joined or connected. The handle members are slip-fitted the one onto the other with the connector occupying a reinforcing position on the inside surface of the end of the innermost handle member in one embodiment and, according to another embodiment in which the connector housing comprises two half portions, joins the handle members in an abutting relationship.

Abstract: A reenforcer (11) has a body (12) and an extension (13) which are disposed between and engage the sliding panel and the frame of typical sliding glass door or window assemblies to hinder movement of the sliding panel by an intruder. Improved adjustment and reenforcement characteristics are attained by coupling the base and extension by a reenforcement assembly (14), forming a plurality of holes (19), (24), (32) through the base, extension, and reenforcement assembly providing for selective alignment of said holes, and providing latch-borne knobs (28), (36) for selectively engaging the aligned holes.

Abstract: A modular retaining device provides ease of assembly and disassembly as well as versatility. Conversion from spring loaded plunger type retention to through hole pin type retention by pressing the retaining module in or out of a through hole cavity provides this versatility without the weakening effect of the intersecting bore hole required for known spring loaded plunger retention systems. A variety of configurations for the retaining element is provided.

Abstract: A form supporting bracket for supporting a concrete form including an upright form supporting member, a lower prop leg connected to the upright member, an upper prop leg connected to the upright member at one end and a slidable member at its other end. The slidable member cooperates with the lower prop leg to slide therealong and includes a plurality of angle slots which mate with a plurality of oppositely angled slots on the lower prop leg. The angle slots are selectively fixed relative to one another by an elongated member which can be driven into the ground.

Abstract: To detachably fasten and secure a drainage element (3) on pressing plate (1) of a fruit press, the end of drainage element (3) provided with an insert (4) is inserted into sleeve (5) of pressing plate (1). On sleeve (5) there is placed a retaining ring (7) made as a flat spring ring that carries several cams (9, 10) on its inner periphery. In sleeve wall (12) there are slots (11) in which cams (9, 10) engage. While cams (9) are used to fix retaining ring (7) and to secure sleeve (5) axially, cam (10) is guided through sleeve wall (12) and engages in a recess (13) of insert (4) so that drainage element (3) is secured against axial movement and torsion.

Abstract: A vacuum-cleaner pipe has an inner tube telescopingly received in an enlarged end of an outer tube. A retaining element diametrically opposite a slider which can be operated by the user can be received in an annular space between the tubes and on opposite sides of a guide body around which, in at least a partial turn, extends a bar spring which is braced against the guide body and not only provides the bias to the retaining element in the direction in which it presses a detent into a selected recess of a detent strip of the inner tube, but also forms the coupling between the slider and the retaining element so that upon movement of the slider in one direction, the retaining element is moved in the opposite direction.

Abstract: A crutch assembly capable of having its longitudinal dimension adjusted by a movable lower leg member selectively positionable between an outwardly extended position and an inwardly retracted position through operation of a trigger mechanism. The trigger mechanism either attaches or releases the lower leg portion relative to an elongated base of the crutch and prevents or allows movement of the lower leg portion between the extended and retracted positions due to force exerted on the lower leg member by a biasing spring or by gravity. The height of the crutch is thereby selectively adjusted for adaptation to different elevations of the surface over which a user travels such as when traversing steps, stairs, ramps, etc.

Abstract: A steering column for motor vehicles with a steering shaft that is movable in the axle direction and held by a positive connection notching. The notching is formed between a jacket barrel (1) placed so that it is fixed from turning, and a solid body thrust bearing (2) and consists of toothed gearing segments (4, 5) on the width of the jacket barrel (1) and anchored toothed elements (6, 7) that are movable on the thrust bearing (2) with at least a gear tooth (9, 10). Wedge bodies (11, 12) are provided that by means of a control are movable in the bolt position brought about by the notching. The gearing tooth portions on the jacket barrel (1) include at least two segments (4, 5) developed with the same tooth spacing, that nevertheless are arranged around a half gear segment displaced with respect to each other.

Abstract: A disc brake caliper is provided which has a parking brake. A dual lever parking brake apply assembly is also included which allows adjustment of the parking brake without modification of the parking brake cable. The adjustment is made by changing the relative position of the levers with one another.

Abstract: A guard for a baby carriage in which armrests have fitting holes facing a front surface and a guard has fitting pipes which are insertable into these fitting holes. Each of the fitting pipes has a biased tab which is engageable with a engagement hole at the side of a cylidrical hole at the back of the fitting hole. An opening button, at the bottom of the arm rest, releases the biased tab for the removal of the guard. Planar covers with rear projections are fittable into the fitting holes.

Abstract: A tilt telescope steering column comprises a bracket pivotably supporting a housing between first and second pivot limits. The first and second pivot limits may be changed. A pair of screws attach the housing to the bracket and clearance between the screws and the housing is taken up. A tubular member is located within the housing and is axially movable relative to the housing. Axially spaced bearings engage the housing and the tubular member to take up clearance therebetween. A tilt blocking mechanism includes a lock member carried by the housing and movable to a position blocking relative pivotal movement between the housing and the bracket. The lock member is moved against a surface of the housing when the lock member is in its blocking position to take up clearance between the lock member and the housing. A telescope blocking mechanism includes a lock pin which is movable to a position blocking relative axial movement of the tubular member and the housing.

Abstract: A swivel stool or chair adapted to support a person so that the person's weight is distributed between the posterior and the shins in a kneeling-like position, the stool combines a base member from which there extends upwardly a substantially vertical supporting column adjustable in vertical supporting column adjustable in vertical direction, a substantially flat preferably slanting seat support being arranged at a first level at the top area of said supporting column for supporting the posterior of a stool user and a substantially flat shin support is spaced from and disposed at a second level below and forward of said seat support and preferably slanting in the opposite direction thereof.

Abstract: A shuttering apparatus includes at least two rectangular shuttering panels (22, 22') which have a plurality of bores of the same dimensions which extend along at least one edge (13, 15) in a row parallel to the edge and are arranged in accordance with a grid dimension at grid points having the same spacing. The bores have axes extending perpendicular to the edge. The shuttering panels are capable of being placed together with their edges containing the bores (11, 11') being so aligned that several connection bores (11, 11') of the one shuttering panel are aligned with several connection bores (11, 11') of the other shuttering panel. In this way a form locked connection of the shuttering panels (22, 22') in the direction of the edge (13, 15) which contains the lines of bores can be brought about by fitted connection pins which are placed through at least some of the aligned bores (11, 11') of the two shuttering panels (22, 22').

Abstract: A locking mechanism for extendible telescoping tubular members formed with radial, axially aligned openings. The locking mechanism comprises a hollow housing that surrounds the exterior wall of the outer tubular member. The housing is adapted for movement in the axial direction of the telescoping tubular members along the exterior wall of the outer tubular member. Disposed within the housing is at least one spring loaded lever that pivots about a fulcrum in the housing. Fixed to the opposite end portions of the lever, respectively, are oppositely directed plungers. When the radial openings of the telescoping tubular members are in register, the locking plunger enters the registered openings to restrain axial displacement between the telescoping tubular members.

Abstract: A shaft coupling for a tubular shaft and a member with a collar is disclosed. The shaft coupling includes a U-shaped spacer which has a length such that the spacer can be properly located in the tubular shaft easily. The spacer also includes flares to keep the spacer in place during assembly and operation.

Abstract: A hydraulic cylinder, piston and rod assembly wherein the piston is secured to the rod in an efficient and inexpensive manner. The piston includes a threaded interior which is secured to a corresponding threaded portion on the end of the piston rod. An opening through a portion of the piston is aligned with a recess within the end portion of the piston rod to permit the insertion of a locking pin into the aligned openings. Thereafter, a compression ring, which is pivotally attached to the locking pin, is slipped into a complementary groove that is provided on the exterior periphery of the piston end portion. This provides a positive connection between the rod and piston which tolerates dimensional variations and eliminates play.

Abstract: A connector for a child vehicle, such as a stroller or carriage, for connecting sub-assemblies to the tubular frame of the vehicles. The sub-assemblies each have a connecting portion for close mating fit with associated connecting free end portions of the tubular frame. The mated portions are interconnected by a spring-biased connecting member which is provided in one of the mated connecting portions or connecting free end portions, and has a lock element locatable in a through bore in the other portion. The lock element is retractable inwardly of the through bore for disconnecting the mated portions.

Abstract: A connecting link for use on a bucket loader mountable on a tractor to control the pivotal movement of the bucket relative to the mounting frame to which the bucket is attached is disclosed wherein first and second members are telescopically associated to permit a varying of the effective length of the connecting link. A first pin is engageable through a first set of alignable holes through the first and second members to fix the telescopic position of the connecting link in an operative position. The first pin has a size sufficient to withstand the operating forces exerted on the connecting link during operation of the bucket. A second pin is engageable with the first and second members through a second set of alignable holes therethrough to shorten the effective length of the connecting link to a transport position and permit a rollback of the bucket for transport.

Abstract: A controlled environment system and method for constructing same provides for the containment and safe handling of toxic waste materials which are ultimately collected and disposed of without contamination of the external atmosphere. The system generally comprises a frame, a seamless tube-like liner connected to the interior of the frame, at least one air lock disposed within the liner for compartmentalizing the liner, and a negative pressure source for creating a negative-pressure environment within the liner so as to prevent the escape of toxic waste materials therefrom. The invention also includes a unique retainer ring for interconnecting adjacent structural members during assembly, and for rapidly disconnecting the structural members during disassembly without the use of a tool.

Abstract: An applicator for particulate carpet-cleaning compositions having a cylindrical body formed of relatively rotatable inner and outer concentric cylindrical members in 360.degree. frictional nested engagement, separately attached non-rotatably to opposite wheel members of greater diameter than the body, and having dispensing apertures in cylinder which may be closed by the other depending on relative rotational positions. The cylindrical members are relatively rotatable very easily be opposed manual rotation of the wheels to dispensing positions, a closed position, and a filling position in which major filling openings in the cylindrical members are aligned. The cylindrical members are indexed to exact relative positions for accurate dispensing, spill-free filling and air-tight closure.

Abstract: A collar or body portion (40) has an inner surface (42) that defines a circular bore (44) therethrough. A cam surface (46) is recessed into the collar portion from the circular bore. The collar is disposed with a tubular member (22) extending through the circular bore with a spring biased detent (30) engaging the cam surface. A series of upper plateaus or segments (60) and lower plateaus or segments (62) hold the detent against the cam surface as the collar is rotated. A handle portion (64) facilitates manually rotating the collar to depress or release the spring biased detent.

Abstract: A foldable walker includes a pair of side walking legs pivotally mounted on a pair of T joints, a front transverse bar secured between the two T joints, a pair of foldable links each pivotally connected between each T joint and each side walking leg, and a pair of seesaw controllers each fixed on an outer tube of a link and seesawly biasing a locking button resiliently retained in an inner tube of the link, whereby upon the depressing of the button by the seesaw controller, the inner tube will be telescopically received within the outer tube when folding the side walking legs toward the front bar, thereby resulting in a simpler, quicker and more convenient folding operation of the walker.

Abstract: A fastening device applied to fasten a pair of handle supports on a skiing machine has an upper semi-circular clipping element which is complemented by a matching lower semi-circular clipping element to receive a bending terminal of handle support. A semi-circulr recess is provided at an external central region of the upper semi-circular clipping element, and a circular depression is provided at an external center region of the lower semi-circular clipping element. A cylindrical housing, mounted on a base of the skiing machine encases the upper and lower semi-circular clipping elements, and has two openings. A securing knob is applied to secure the upper semi-circular clipping element and the cylindrical housing together tightly, which is threaded through an opening on the cylindrical housing into the recess with a pad. A retarding bolt is disposed between the base, cylindrical housing and lower semi-circular clipping element. A spring element urges the retarding bolt to insert tightly therebetween.

Abstract: An arch assembly for separating playing areas between contestants is formed from a rod made from plural sections of tubing removably interconnected by threaded connectors or by pins extending through aligned apertures and held by VELCRO.RTM. straps. The ends of the rod are received within sockets in support members that may be staked or otherwise held down on a support surface. The separation between the support members is limited by a flexible cable connecting them. A cable having permanent stops and which may be knotted to form temporary stops may be used to vary the separation between the support members and thereby the height of the arch. A water hose connection may optionally be provided and a portion of the rod apertured to produce a water spray.

Abstract: A collapsible cart comprises a base an adjacent one and a transverse axle mounting a pair of wheels. A collapsible basket is removably secured to the base and a handle socket extends upwardly from the other end of the base forwardly of the basket. A formed handle has one end portion removably nested and secured within the socket, with its other end projecting forwardly, its one end portion providing a central support for the cart.

Abstract: An adjustable safety block assembly is disclosed which can be used to traverse an opening for a sliding door in order to block it. The assembly consists of inner and outer tubular members which can be telescoped together. One of the tubular members has a series of axially extending rows of holes spaced at even intervals, and staggered around the radius of the two. The other tubular member has groups of evenly axially spaced circumferentially distributed holes radially arranged. The tubular members may be telescoped until the desired length is achieved, and then holes of the inner and outer tubular members aligned so that locking means can be inserted through the aligned holes to fix the tubular members in relative position, to form a rigid bar. Thus, the safety block is easily adjustable to accommodate any patio door widths, and may be disassembled for storage and travel.