Abstract: A device for securing and restraining a pair of adjacently mounted bicycles includes a body having first and second portions with at least one strap slidably connected thereto. The first portion is configured to engage the foot pedal of one bicycle while the second portion is configured to engage the frame of a second bicycle. At least one strap is provided for securing the device to at least one of the bicycles.

Abstract: A coupling including a sleeve having an annular rib formed on a lower peripheral portion, a bowl having an annular groove formed in an outer peripheral portion, a ball bearing disposed between the sleeve and the bowl, a gap formed between the bowl and the sleeve, and a gasket including an annular flange formed in an upper portion for engagement with the annular groove of the bowl and a member formed in a lower portion for engagement with the annular rib of the sleeve so as to cover and seal the annular gap formed between the sleeve and the bowl.

Abstract: In this arrangement, each of two elements, namely a support element and a flow control element forms on at least one of its two outsides part of a flow control surface. A joint element couples the flow control element movably to the support element and is arranged at a distance behind the flow control surfaces. The support element and the flow control element have in the area of the joint element, end faces that face each other. These define a space which is filled up by a soft and elastic filler piece.

Abstract: A coupler body 12 with a socket 44 therein is attached to nuclear stream generator tools to be mated with an arm 22 of a remotely controlled manipulator. A plug 16 for insertion in socket 44 is mounted with a ball detent lock actuating air cylinder 18 on L-shaped bracket 20 attached to the end of arm 22. Cam surfaces 62 on body 12 and 64 on bracket 20 align the plug 16 and socket 44 for insertion to mate and couple the tools and arm 22.

Abstract: A fixture for a folding bed, comprising a 3-way pipe connector secured to the frame tubes of a folding bed at one corner by a rivet, and a side tube movably fastened in said 3-way pipe connector, wherein said side tube has an elongated slot through which said rivet is inserted to control the moving range of said side tube in said 3-way pipe connector, fastening holes for fastening support means to secure a tent, a mosquito net, a stand for intravenous infusion or casters to said folding bed. The side tube further comprises a flexible strip made through punching process, which flexible strip has a stop block made on the free end thereof to automatically stop the side tube from moving back into the pipe connector once it is extended out.

Abstract: A locking member, preferably used for preventing axial displacement of a stabilizer bar on an automobile, includes inner and outer elements interconnected by a strap. The inner element includes two portions joined to each other by a living hinge. Contacting surfaces of the inner and outer elements are tapered to generate a clamping force when the outer element is assembled over the inner element.

Abstract: This invention provides a fastening system comprised of at least two pieces to be fastened together, the pieces exhibiting planar characteristics and each piece is characterized by having at least one slotted through bore in the material comprising the piece and, a fastener having a stem portion and orthogonally oriented cross bar portions at each of its ends to define an I-shaped configuration, the fastener interconnecting the pieces together in planar face-to-face orientation by having one of its cross bar portions passed through the slotted bore in one of the pieces and having the other cross bar portion passed through the slotted bore in the other of the pieces such that the stem portion is in a seated engagement within the bores of the pieces.

Abstract: There is provided a clamp-type apparatus for connecting a first object, such as a vibratory mechanism, to a second object that is a box-type vessel having at least one slot in a side near a corner, such as a steamship truck container, which apparatus comprises: (a) a first plate having a first aperture and at least one second aperture, the at least one second aperture being used to attach the first object to the first side of the first plate; (b) a bolt-type fastener for attaching the second object to the second side of the first plate, the fastener passing through the first aperture and being capable of rotating about its axis; (c) a rod for rotating the fastener about its axis; and (d) a small second plate for preventing movement of the apparatus relative to the second object, the second plate being perpendicular to and attached to the first plate. There are also provided a method for connecting a vibratory mechanism to a steamship truck container and a method for vibrating a steamship truck container.

Abstract: A clip is disclosed for mounting a flush plate such as a mounting tray or the like within a corresponding opening in an extruded frame member such as a transom bar, door frame, or the like. The clip includes a pair of tongue members held together in spaced apart relation by an interconnecting bridge member. The tongue members are inserted into corresponding channels defined in the extruded frame member adjacent the opening, and when the clip is thus mounted to the frame member, a portion of the clip extends into the opening. In the disclosed embodiment, the bridge member is located to abut the end of the extruded frame member to limit the depth to which the clip is inserted into the channels. With the clips thus mounted, the flush plate is fastened to the clips to secure the flush plate to the extruded frame member. The clip is less expensive to produce than two corresponding single tongued clips and requires only one installation step rather than two.

Abstract: A coupling structure and a method of coupling resin structures wherein a first member is coupled with a thermoplastic second member through a coupling force produced by constricting the volume of the resin during molding and/or the generation of an undercut structure. The undercut structure results from the deformation of a projection member caused by the flow pressure and temperature of the resin. A recess is provided in one of the members. The recess is indented in the laying direction. On the other member, a projection is provided which enters the recess. The coupling of the two members is therefore simple and does not require the use of a subsidiary material. Additionally, when an undercut structure is formed, extremely strong coupling is obtained. Since the undercut is formed by deformation of the projection, no undercut structure is required to be formed on the die, so that no extra cost or burden has to be forced on the die.

Abstract: An assembly for providing socket plate torque restraint for a variable displacement wobble plate compressor includes a non-rotary Rzeppa joint. The joint has an outer race, an inner race, grooves in the races, a plurality of torque receiving balls and a cage for properly maintaining and positioning the balls in the grooves for operation. The joint is connected to an anti-rotational shaft. The shaft is mounted by the drive hub of the compressor to allow for translational axial and relative rotational motion. At least one key is received in a keyway in the anti-rotational shaft and a companion socket in the cylinder block fixed to the compressor housing. The Rzeppa joint provides the ideal kinematic restraint motion of the socket plate; the profile of the grooves on the inner and outer races and the cage having a curvature to effectively maintain the balls situated substantially in a single torque transmitting plane that bisects the joint angle.

Abstract: A fluid cooled thermal skin is bolted to a sufficient back structure. In-line coolant flow paths are arranged to pass the cooling fluid through the bolt head. The in-line paths are recessed adjacent the bolt head to mate with flow openings in the head. In one embodiment the paths through the bolt head are parallel paths, requiring alignment of the bolt head. In another embodiment alignment of the bolt head is not required.

Abstract: A robotic wrist employs a plurality of elastomeric containers holding an electro-rheological fluid. An electromagnetic field can be selectively applied across the electro-rheological fluid within these elastomeric containers to selectively control the viscosity of the electro-rheological fluid and thereby control the stiffness of the elastomeric containers. Two sets of elastomeric containers can be used to control both the axial and radial stiffnesses of the wrist. In the preferred embodiment, the elastomeric containers have a hollow spherical shape. An electromagnetic field is created within the containers by applying a voltage between a conductive film on the interior surface of the sphere and second electrode extending through the sphere into the electro-rheological fluid.

Abstract: A mechanism for attaching the protective bar (1) of a baby carriage to the armrest bars (2) thereof. The mechanism includes fitting juts (3) respectively provided in the armrest bars at opposite ends thereof and engaged in fitting holes (5) provided in the protective bar and engagement bolts (4) rotatably inserted into the bolt holes (11) of the armrest bars and into the bolt holes (61) of the juts so that the protective bar is detachably attached to the armrest bars. Each of the bolts has a head (41) at a butt end thereof and an engagement pin (43) at an opposite tip end of the bolt so that the longitudinal axis of the pin is substantially perpendicular to the longitudinal axis of the bolt. Each of the bolt holes (61) has peripheral openings at one end thereof so that the pin can be passed through the openings and each of the juts has projections (63) at the peripheral portion of the bolt hole (61) near the other end thereof so that the projections are engaged with the pin to hold the bolt.

Abstract: A steering knuckle attachment configuration for mounting with motor vehicle suspension and steering components is provided in a one piece steering knuckle housing. The lower end of the housing includes a flat major face to which a bearing carrier or torque plate may be mounted. The knuckle housing has both an upper end and a lower end, one of which includes an integrally formed open ended channel that is also open on one side. The channel is adapted to receive in its open end an attachment post projecting a suspension component. The post is secured within the channel by a transversely inserted fastener which engages the post member in an interference relationship.

Abstract: The vehicle door has a mounting panel with a track formed therein by integral flanges struck from the panel. The window regulator arm has a roller carried thereon for engaging with the track to permit movement of the roller along the panel. The track has an open end permitting entry of the roller into the track when the roller has obtained both axial and cross-track alignment with the track. In order to facilitate installation of the roller into the track, the roller has an end face and the panel has an integral portion thereof underlying the open end of the track and being engaged by the end face of the roller to establish the roller in a position of axial alignment with the panel from which the roller may be easily entered into the open end of the track.

Abstract: A robotic structure having a low mass, capable of providing seven degrees of freedom, and movable in a hemispherical workspace. The robotic structure includes several platforms connected by actuatable longitudinal members and movable joints made of intersecting or interwoven wire members.

Abstract: A closure pin extends through aligned openings in first and second spaced apart eyes at the open end of a substantially U-shaped clevis. One end of the closure pin is threaded and mates with threads in the opening in the second eye. The closure pin includes a head portion and a radial flange at its opposite end, and it carries a releasable lock member. The releasable lock member includes a pair of detents which are positioned in radial slots in the flange. A spring biases the lock member into a position in which the detents extend axially beyond the radial flange towards the threaded end of the pin. A plurality of lock ramps are provided on the outer face of the first eye. The ramps are spaced circumferentially apart.

Abstract: A connector assembly comprised of two halves, each respectively including a shell type connector sub-assembly, one being an active half and the other being a passive half. The active half includes an alignment cusp that causes a coupling motion in response to coming in contact with the outer portion of the other half which causes the respective connectors within the two sub-assemblies to move toward each other into coupling relationship at twice the rate at which the two sub-assemblies come together. Both halves are adapted to rotate about and translate along respective mutually orthogonal axes to facilitate an interconnection.

Abstract: A coupling is used for releasably connecting tools to the articulated arm of excavators and other heavy duty equipment. The coupling includes a first coupling member, a second coupling member, a locking member provided on the first coupling member and movable between lock and release positions, a spring arranged between the first coupling member and the locking member for urging the locking member into the lock position, and a hydraulically operated release mechanism provided on the first coupling member for moving the locking member into the release position in opposition to the force of the spring. Hydraulic fluid at a pressure relief pressure level is applied through a first non-return valve to release the locking member and permit detachment of one tool and attachment of another tool; the pressurized hydraulic fluid is then returned through a second non-return valve to return the locking member into the lock position, thereby retaining the newly attached tool under pressure of the spring.

Abstract: A steering bearing assembly is provided for connecting the front wheel and handle bars of a bicycle to the frame. The assembly includes a steerer tube, connected to the front wheel and passing through a head tube on the frame. Bearing assemblies on the upper and lower ends of the head tube allow the steerer tube to pivot within the head tube. The upper bearing assembly has a first race connected to the head tube and a second race having a tapered contact surface. Above the second race on the steerer tube is a compression ring having a gap so the ring can be compressed against the steerer tube. The connector of a stem is located on the steerer tube above the compression ring. The handle bars of the bicycle are connected to the stem. An adjuster nut is threaded into the upper end of the steerer tube, exerting a downward force on the connector and the compression ring. The second race compresses the compression ring, locking the upper bearing assembly in place on the steerer tube.

Abstract: A locking or locating mechanism comprising first and second complementary, semi-circular metallic members, each of said members having two mating surfaces interengageable with two surfaces of the other member and cooperating for radial and axial alignment to form on engagement an open-ended cylindrical body having opposed cylindric surfaces and opposed marginal surfaces. For each half-member, one mating surface is the mirror image of the other. The first and second members are interengaged at the mating surfaces, and a bolt member interconnects the two members.

Abstract: A coupling for securing a handlebar to a bicycle frame that carries a bowl through which a standpipe is received, the bowl including a bore formed in a center for receiving the standpipe and a hole communicated with the bore, two members received in the hole and in contact with the standpipe, a bolt extended through one of the members and threadedly engaged with the other member so that the members can be clamped together by the bolt and so that the standpipe can be fixed in place by the members.

Abstract: A plastic coupling device for connecting two building elements includes a T-shaped coupling member having two inwardly bent ends and an adjacent pair of W-shaped plates each having inwardly bent ends, respectively, for slidably, tightly receiving the T-shaped coupling member along adjacent side portions of the W-shaped plates so as to form a composite ceiling plate used in building ceilings.

Abstract: A seismic expansion joint cover comprises a pair of elongated frame members, each of which is adapted to be secured to a building member, one on one side of an expansion gap and the other on the other side of the expansion gap, and each of which has a planar support surface and an edge adapted to overhang the gap. An elongated cover member spans the expansion gap and is supported on the support surfaces of the respective frame members for sliding movement of the frame members relative to the cover member. A hold-down assembly resiliently holds the cover member in engagement with the support surfaces of the frame members.

Abstract: The invention relates to a fastening hardware set for the adjustable fastening of a drawer front to the sides of a drawer. The invention has a hook which can be affixed to the front mark. A stud unit which can be releasably held by the hook is provided on the corresponding side.

Abstract: The present invention provides an arrangement for attaching a flexible elastomeric panel integrally formed with one or more female connectors to an automotive body support surface having one or more associated male connectors in a blind assembly connection. Each female connector comprises a cutting-tooth shaped notch molded in an attaching flange of the panel while the male connector comprises a elongated stem projecting from the support surface. The elongated stem includes a backing plate positioned in parallel spaced relation to the support surface defining a layered gap therebetween. The panel flange is moved into flush contact with the support surface enabling the support flange to be received in a layer-like gap with the stem adapted to be received in a lean-in passage of the female connector.

Abstract: A structural pivot 10 includes a first sleeve 18 and a second sleeve 20 which are connected by a pair of parallelogram shaped flexible elements 22 and 24. The flexible elements include tapered ends 40, 42 and 44, 46, respectively. The tapered ends of the flexible elements are connected to sleeves 18, 20 so that the flexible elements 22, 24 are assembled in a crisscross fashion while the flexible elements remain spaced from each other. During angular rotaton of the sleeves, the flexible elements undergo both flexural and torsional action.

Abstract: A positive stop clamp for clamping a cross tube of a tie rod to a tie rod end includes a one-pieced clamp body having a U-shape cross section and a locking fastener. The clamp body includes two flat ends, each end having a pair of inwardly bent ears whereby a substantially circular interior is defined. The body further includes a cantilevered locator tab having a flange at its end. The flange abuts the end of the cross tube to locate the clamp at the desired point on the tube.

Abstract: The invention discloses a liner hanger assembly which is mechanically attached to the component to which the liner is secured, thereby allowing hanger materials to be selected based on other than weldability considerations, and allowing the hanger to be removed and repaired when worn or damaged.

Abstract: A connection for establishing a joint between materials having different coefficient of thermal expansion. The connection has a first and second members made from materials that have different coefficient of thermal expansion. The first member has a cylindrical end with a bore therein and a rib located on the peripheral surface of the cylindrical end. The second member has a first diameter section located in the bore of said first member and a second diameter section. A sleeve which surrounds a portion of the cylindrical end of the first member and the second diameter section of the second member has a groove for receiving the rib on the first member. Bolts extend through the sleeve into the second diameter section to establish an external compressive force between the sleeve and the rib to hold the first member and the second member in a fixed relationship and form a unitary structure.

Abstract: A ball joint assembly provided with a connecting rod, which has a connecting member formed at one end and a ball head formed at other end, and a piston having a ball seat for placing a ball head therein, and a cylindrical sleeve protruding from the rear end of the piston having a diameter less than that of the cross section of the piston and having at least two inserting holes formed at predetermined places around its inner circumference, a ball seat formed inside the sleeve and having a projecting section protruding from the rear end of the piston to receive the ball head therein, and a flexible member having a central portion at the center of which a hole is formed to pass through a connecting rod and at least two leaf portions extended from both sides or a plurality of directions from the central portion so as to support the ball head in the ball seat, in which the flexible member is fixed by a mounting means to the sleeve by either inserting the ends of the leaf portions into inserting holes on the sleeve

Abstract: An improved connector comprises a coupling sleeve, a cylindrical connecting block, and a bellows hose. The coupling sleeve has a base member on its outer surface. The base member has an annular ring and an engaging pin protruding from the base member, the end of which is formed as a wheel-shape disk. The connecting block is provided with a receiving hole, an annular ring, and a peripheral flange.

Abstract: A clamped connection between a profile part and a sheet metal part by mans of a clamping strip. An edge area of the sheet metal part is held in its position between a foot portion of the clamping strip and a receiving device of the profile part and rests on an angular portion of the receiving device. An edge area of the sheet metal part, which projects into the receiving device and has a rectangular construction, is fixed in the receiving device by means of the clamping strip having an approximately T-shaped cross-section, the wedge-shaped foot portion of the clamping strip having at least one detent which interacts with an undercut area of the receiving device. Holding lips of a head portion of the clamping strip interact with the sheet metal part and the profile part in a supporting manner.

Abstract: An improved two part detachable shaft device is connected to a rotatable cutting and shredding member of a comminutor. When these detachable shaft devices are mechanically key connected to the rotatable member along the axis of the comminutor on opposite sides thereof, the shafts and rotatable member form an effective unitary rigidly mounted rotor along the axis of the comminutor and perpendicular to the flow of fluid through the comminutor. Each detachable shaft device provides a unique and convenient means whereby a comminutor cutting and shredding member or both or either shaft device may be readily and efficiently removed for repair or replacement. Each of the detachable shaft devices includes a unique bearing sealing arrangement into which each end of the shaft not connected to the rotatable member extends.

Abstract: A recording drum assembly comprises a cylindrical drive shaft 1, a drum 2, and an annular disc 4 of resilient material, such as spring steel, located between the drive shaft 1 and drum 2 and substantially coaxial with the drum 2. The disc 4, by elastic deformation when engaged by the drive shaft 1, provides axial alignment of the drum 2 and drive shaft 1. A portion of reduced diameter may be provided on the drive shaft 1 to facilitate removal of the drum 2 from the drive shaft. Furthermore, the annular disc 4 may be used to support the drum 2 during machining of the drum outer surface to ensure coaxial alignment.

Abstract: A spline channel in a frame member is used in combination with a spline for securing a screen to the frame member. The spline channel includes a bottom wall having two end walls extending upwardly therefrom and terminating in inwardly extending lips. One of the lips extends further inwardly than the other of the two lips. The spline includes opposite side edges, one of which is forced into the recess beneath the longest lip so as to force the screen into the recess between the spline and the end wall of the channel. The opposite edge of the spline is then pressed downwardly until it snaps into the channel and holds the screen in place.

Abstract: Disclosed is an actuator comprising a plate-shaped output member including a shape memory alloy, which is disposed between two bodies capable of relative movement. The output member comprises a shape memory alloy having such shape memory characteristics that a wave plate shape having at least one wave which extends in the direction orthogonal to the line connecting the attachment ends of the output member to be attached to the two bodies is formed in a specific temperature region. By utilizing the force of the output member for restorign the memorized shape in this specific temperature region, relative movement is caused between the two bodies constructing an articulated arm. The two bodies are turnably supported on a shaft and the above-mentioned actuator is arranged in the state set off from one side relatively to a plane including this shaft so that two bodies are relatively turned around this shaft.

Abstract: A locking system for preventing rotation of the adjustment bushing with respect to the shaft housing in a rivet shaver includes a threaded hole formed in the shaft housing. Located over the threaded hole is a slot which is formed in the adjustment bushing. A threaded fastener passes through the slot and into the threaded hole formed in the shaft housing. The threaded fastener is retained in position by the frictional engagement of the threaded fastener with the shaft housing.

Abstract: The invention provides a structural dismantable joint assembly for joining a first to a second structural framework member, comprising a band clamp sized to embrace the first structural member and provided with a pair of alignable spaced-apart apertures near the ends thereof, the second framework member, being of hollow cross-section and having at least one end provided with two opposing holes, the ends of the band clamp being insertable into the second framework member between the holes, the apertures being in alignment with the holes, and a tightenable bolt unit configured for insertion through the opposing holes and the apertures, whereby on tightening of the bolt unit the ends of the band clamp are brought more closely together as result of pressure being applied by the opposing walls of the second framework member, the assembly being thereby fastened to hold the two framework members in selectable angled relationship to each other.

Abstract: A retainer for supporting an injection molding machine ejector bar. The retainer is mounted to a hydraulic ram and secures an ejector bar in clamped relation relative to an extractor pin assembly secured to a molding die. The retainer includes a relatively large self-aligning cavity wherein an ejector bar end is confined via a transverse mounted jaw having a ridged gripping surface that interconnects with an annular slot formed in the ejector bar.

Abstract: Apparatus useful in surgery for holding retractors and other surgical instrumentation in a number of different positions required by a surgeon for the performance of a surgical procedure, including advanced sensing and regulation of retraction pressures and position; and incorporating a force amplification method to drive a locking mechanism in the supporting structure that utilizes a constrained, substantially incompressible, flexible solid material to yield a mechanism that is suitable for clinical use.

Abstract: A modified ball and socket connection is provided between links of a windshield wiper linkage system to resist rolling motion of the links with respect to the ball. A pin extends from the ball into sliding and rotating engagement with a slot formed adjacent the socket.

Abstract: An arrangement for associating an electrical device with a mounting is provided that includes cooperating structure to prevent the association of inappropriate electrical devices and mountings. Specifically, cooperating support structures that are provided on the mounting and carried by the electrical device cooperate to provide the supporting of the electrical device within the mounting; the cooperating support structures being dimensioned so as to interfere with and prevent the association and support of an electrical device in a mounting that is inappropriate therefor. In a specific arrangement, either the electrical device or the mounting carries receiving structure with defined openings, and the other of the electrical device or mounting carries interfitting protuberances.

Abstract: A curved cable end connector for providing directional changes of a flexible control cable includes a male end adapted to be rotatably locked within a female receptacle at the end of a cable conduit. The connector is formed of relatively rigid plastic material and includes an enlarged male receptacle end having resilient locking tabs formed therein for receiving a similar connector or other type of cable end connector.

Abstract: A hold down device is provided using a drive knob having a clutch therein which turns a drive shaft for moving a pawl shaft in and out with respect to the drive shaft. A pawl on the end of the pawl shaft is provided with a cam-like surface which engages a cam-like aperture in a pawl receptacle. The pawl shaft has a cam follower which rides within a cam surface in a cam bracket that surrounds the shaft. Under the urging of a spring, the position of the pawl is controlled from its fully extended, unlocked position to a pre-capture position where the pawl is oriented at approximately 45.degree. to an aperture within the pawl receptacle. Insertion of the pawl into the pawl receptacle forces the pawl to rotate an additional 45.degree. against the urging of the spring. After full insertion of the pawl into the receptacle, the pawl rotates back to its 45.degree. position where it is captured therein.

Abstract: A clamping means for clamping the wires of a saddle to the upper end of a support post of a bicycle frame or the like. It consists of a lower cradle support clamping member and a cooperating upper clamping member which are mounted on the post to permit tilting of the saddle. The clamping members are so designed that they can be extruded from metal with a post-receiving socket at the lower side of the lower member. This socket, because the lower member is extruded, has a flat inner wall and side walls extending linearly in spaced relationship, with the side walls being at sharp angles to the inner flat wall to provide sharp corners for engaging the sides of the post at a fulcrum formed thereon to prevent lateral displacement of the lower cradle support on the post.

Abstract: A detent connection between a hidden release lever of a tilt-adjustable automotive steering column and an exposed hand lever of the steering column, the connection including a D-shaped socket in a tab on the release lever and a D-shaped plug-end on the hand lever. The flat portions of the D-shaped socket and plug-end face each other and each has a trough therein extending the full length of the flat portion and facing the trough in the other flat portions. The facing troughs define a detent tunnel in which a cylindrical coil spring is disposed in radial compression. The spring engages the troughs along the full lengths thereof to torsional and lonitudinal rigidity.

Abstract: A breakaway system is disclosed for timber utility poles. The breakaway system limits the amount of force and energy imparted to an impacting vehicle and its occupants by incorporating an arrangement of slip plates and bolts to form a shear plane on the utility pole at or near ground level, and by providing a hinge mechanism on an upper section of the utility pole below conducting lines and the like. The material and configuration of the lower shear plates are selected to permit activation for any direction of collision loading. The material and configuration of the upper connection or hinge are selected to allow for adequate resistance to environmental loads while at the same time allowing for precise determination of the magnitude of failure load. In addition, the combination of upper connectors prevents the lower portion of the utility pole from rotating upward into the conducting wires after a vehicle impact.

Abstract: A removable end plug for closing off the open end of a hollow vehicle bumper. The end plug comprises a molded unitary body of flexible deformable material having four side sections in the form of a hollow square and a four sided truncated pyramid shaped operator portion connected to one transverse edge of the side sections. The operator portion has a normal position whereat the truncated pyramid extends longitudinally away from the bumper opening and a reverse truncated pyramid position to cause said side sections to be bowed transversely outwardly and thereby substantially increase the force of engagement between the outer surfaces of said side sections and the four inside surfaces of the bumper to thereby lock the plug to the bumper.