Abstract: A system for assembling two components of a prosthesis in a plurality of positions which are adjustable in orthogonal translation, and selectively in rotation and angularly. In the system, a projecting part integral with one of these components is engaged in a recess, forming a hollow part of the other component of the prosthesis, or of an intermediate connection element, while screws arranged transversely with respect to the lateral walls of the cell come into abutment, as in the prior art, against the lateral flanks of the projecting part, but without the base of the hollow part bearing directly against the facing surface of the projecting part.

Abstract: A nock system including an insert and a nock. The insert having an introduction end, a receiving end located opposite the introduction end, a substantially cylindrical body extending from the receiving end to the introduction end, and a receiving chamber having an opening at the receiving end and extending a distance into the cylindrical body. The receiving chamber is axially aligned and communicates with a threaded duct which extends farther through the cylindrical body toward the introduction end. The nock comprises a string receiving end for receiving a bow string and an engaging shank located opposite the string receiving end. The engagement shank has a shape and size permitting self-tapping, threaded engagement between the engaging shank and the threaded duct. A compression shank extends between the furrowed end and the engaging shank. The compression shank has a shape and size to produce a friction fit within the receiving chamber as the engaging shank is positioned within the threaded duct.

Abstract: A retainer for a pneumatic tool and assembly therefor is disclosed. The retainer includes a tool body having an internal surface defining a bore and an external surface having a threaded portion. A retainer cap is used with the tool body and includes an internal surface having a threaded portion adapted to engage the threaded portion of the tool body. An insert having an outer surface is rotatably mounted in the retainer cap. The insert includes an inner surface with a first inner surface portion adapted for conforming with a non-circular lug surface of a tool shank and a second inner surface portion radially offset from the first portion adapted for conforming with the non-circular lug surface.

Abstract: A driver, used as a link between a piston of an injection pump and a drive element which rests freely against the end of the piston nearest the driver and moves with the piston, is attached to the drive element in such a way that, in order to establish the link between the piston and the drive element, the driver can be rotated over the widened face of a baseplate located at the end of the piston until it reaches a final position in which it is secured by the fact that it grips the piston.

Abstract: A system of precision, precut joints developed for tubular-framed, modular furniture enabling a user to assemble furniture pieces quickly and easily with the use of ordinary hand tools. In the primary joint of this system, a truncated corner of a horizontal panel or shelf is fastened to a vertically-disposed, grooved section of tubing. Receiving the corner is a groove which is cut in the tubing section transversely to the longitudinal centerline thereof and which has a height slightly greater than the thickness of the shelf or panel. Opposite the groove and midway between opposing distal ends of the groove, the section has a first hole formed therein for receiving a screw threadedly engageable with a second hole formed in the truncated corner. As the screw is tightened, it pulls the truncated corner into the groove, forming a strong joint.

Abstract: A coupling for the drive shaft of prophy angles includes an upper drive shaft with a finger-type clutch, and a lower drive shaft having a main drive shaft with a clutch receptacle, and having a drive shaft clamp. The main drive shaft has an expansion slot extending from side to side through the center of the main drive shaft and substantially along the length of the clutch receptacle. The drive shaft clamp also has an expansion slot extending from side to side through the center and substantially along the length of the drive shaft clamp. The drive shaft clamp fits over the clutch receptacle end of the main drive shaft with the expansion slots oriented perpendicular to each other allowing the finger-type clutch of the upper drive shaft assembly to be pressure fitted into the clutch receptacle.

Abstract: An extrusion interlock assembly provides for the joining of two or more extruded pieces at an interlocking joint that may be slideably mated to produce an easily assembled and disassembled assembly. On one side, the interlocking joint has a first channel mechanically connected to the first side, and a first flange adjacent to the first channel also mechanically connected to the first side. On the other side, the interlocking joint similarly has a second channel and a second flange, both mechanically connected to the second side. The second channel slidably receives the first flange, and the second flange slidably receives the first channel. A fastener laterally displaces the first flange away from the second flange, and the first channel away from the second channel, causing the first flange to frictionally engage the second channel, and the second flange to frictionally engage the first channel.

Abstract: An all plastic container has a plurality of drawers which are pivotally secured within a frame. The drawers have pivot studs which are introduced into ramped grooves in the sides of the frame and which are retained within recesses in the sides when the container is fully assembled. Advantageously, the recesses are located behind the front surface of the container by approximately 40% of the depth of the frame.

Abstract: An improvement of an axial portion of a power piston and a retainer engaging therewith for a booster. An axial portion of the power piston is formed with a first tubular portion, which is provided with a second tubular portion located outward of the first tubular portion. The first tubular portion is fitted over a flange of a valve body from the rear side, and an annular retainer engages the second tubular portion from the front side, thereby securing the axial portion of the power piston, which is formed with the both tubular portions, on the flange of the valve body. The retainer includes a plurality of engaging pawls, which engage the outer peripheral surface of the second tubular portion of the power piston by point contact. This reduces the axial size of the valve body, and hence the axial size of the booster.

Abstract: An electrically driven fan mounted on the brim or crown of a cap or other head gear is manufactured from plastic, and readily mountable on the head gear without the need for special tools or skills. Dry cell batteries are mounted in the crown of the hat and the impeller of the fan units acts within a recess within the fan unit to pull air downwardly across the face of the user.

Abstract: A plastic fence post and cap are secured to each other by a spring tab arrangement which is completely concealed after assembly. In one embodiment, a bottom section of the cap fits over the end of the post and tabs projecting inwardly from opposed panels of the bottom section extend into holes extending through opposed sides of the post. In a second embodiment, a bottom part of the cap is received within the tubular post and has outwardly extending tabs that spring into recesses provided along inner sidewall surfaces of the post.

Abstract: A lightweight structure for a flatbed trailer having a cellular stiffening structure formed from a plurality of vertically arranged partitions which form a multiplicity of polygonal cells is disclosed. The cellular structure has the advantage of providing a strong lightweight structure which efficiently transmits load forces from the floor structure to the base upon which the wheels, suspension system, kingpin and landing gear are mounted. The resulting trailer has about a 4000 pound weight advantage over conventional steel frame trailers and about a 2500 pound weight advantage over conventional aluminum frame trailers, which translates directly into increased payload capacity as the trailer of the invention is capable of carrying loads up to the maximum legal weight limits in most states.

Abstract: A starter head for an internal combustion engine that has a motor shaft and a starter pinion which is arranged for sliding movement along the motor shaft. A fastening shroud secures a free wheel and a drive sleeve to the starter pinion. The drive sleeve carries a return device, which has a ring member having at its inner periphery a plurality of resiliently deformable teeth. These teeth cooperate, in snap-fitting engagement, with a groove which is formed on the outer periphery of an end portion of the drive sleeve.

Abstract: An interlockable connection system is disclosed herein for releasably joining a selected number of tiles together wherein each tile includes a plurality of receptacles adapted to snap-lock with a retaining element used in common with other tiles so as to provide a composite object composed of multiple tiles of various polygonal shapes. The retaining elements may be of many shapes and tiles may be of a variety of geometric configurations. The connection system provides convenient repeatable joining and unjoining of the retaining elements with the tiles and permits rotation of the joint through a large angle about the axis of the joined tile edges.

Abstract: A fluid-pressure operated actuator has a body and an end cap which when telescoped in the body provides confronting grooves which receive a circlip in the form of a flexible length of wire spring. The end cap carries an O-ring seal axially only outwards of the circlip. Relative rotation between the body and end cap draws the circlip into position. A threaded plug, which may be secured to the outer end of the circlip, sealingly connects the body and end cap and may permit relative axial and angular movement.

Abstract: In order to allow a first element (2) and a second element (1) to be tightly clamped together, and yet be easily and quickly unclamped for adjustments to be made to their relative positions, a rotatable clamp is provided. The rotatable clamp comprises three main parts: a first circular plate (4) attached to the element (2) and having a bolt (5) extending from the center thereof, a second circular plate (6) attached to element (1) and having a bolt hole (7) at the center thereof and a nut (8) having a handle (9) attached thereto for screwing onto the bolt (5) so as to force the two circular plates together. Each of the two plates (4) and (6) is provided, on the face contacting the other plate, with a series of circular, concentric grooves (12) and ridges (13) arranged to fit together with the ridges of one plate fitting into the grooves of the other plate as the plates are brought into contact with each other.

Abstract: The invention provides a nut and cap assembly, wherein the nut has relatively flat external side faces symmetrically located about a central axis, the side faces being symmetrical on opposite sides of a central plane perpendicular to the axis of the nut. Each of the side faces has two axially extending slots formed therein on opposite sides of the central plane. The slots are separated at their inner ends by a bridge portion in the respective side face of the nut. The assembly also includes a cap formed of relatively stiff resilient plastic material with a socket formed therein, corresponding generally to the shape of the nut. Each interior side wall of the socket of the cap has a projection extending radially inward and having a ramp portion facing toward the socket opening.

Abstract: A two-piece self-locking pole stand assembly includes a sleeve base that is secured into the ground and a tubular insert that fits snugly into the base, housing two pivot arms that engage the base and automatically lock the insert to it upon insertion of the pole.

Abstract: A camera quick release tripod fastener has a fastener housing (2) with a cylindrical stud bearing (10) into which a fastener stud (1) is positioned in rotational relationship to the fastener housing. The fastener stud has a circumferential attachment groove (6) between a rotational adjustment end (5) and a camera attachment end (4). An attachment lever (6) is attached pivotally to the fastener housing and positioned for pivotal entry into and exit from the circumferential attachment groove for respectively quick release containing and releasing of the fastener stud to which a camera is attachable at the camera attachment end. An adjustment end wall (7) of the circumferential attachment groove is beveled to provide an inclined conical slope against which the attachment lever is positioned snugly to tighten the rotational adjustment end of the fastener stud against an bottom wall (9) of the cylindrical stud bearing.

Abstract: An improved suspended line cable breakaway device includes a first body portion for connecting to a first end of a support cable and a second body portion for connecting to a second end of the support cable. The first body portion includes resilient fingers having nubs, which are releasably received by slots contained in a cavity wall of the second body portion. A biased spreader, slidably contained in a cavity in the second body portion, is displacable axially along the cavity by an external force along the support cable to urge the nubs outwardly such that the second body portion is disengaged from the first body portion, simultaneously disconnecting component lines of a first end of a suspended line from corresponding component lines of a second end of the suspended line. A shield protects the component line connections, which are spaced internal to the device, from the elements.

Abstract: A link assembly connectable to a pair of spaced members and adapted for rotary motion and conical deflection relative to each of the connectable members generally consisting of an elongated, rigid member having a pair of spaced head segments interconnected by an intermediate segment, each of the head segments having an opening therethrough for receiving a connectable member therein, the rigid member further including a pair of identically configured, co-extensively disposed sections mated and rigidly secured together, each of the sections including a pair of spaced head portions interconnected by an intermediate portion, each of the head portions having an opening therethrough registered with an opening in an adjoining head portion of the other section to provide the connectable member receiving opening in one of the head segments, and a bushing disposed in each of the connectable member receiving openings in the head segments of the rigid member, being formed of a thermoplastic polyurethane material and havi

Abstract: A fastener for a housing assembly. The fastener is comprised of a key having a hooked end portion formed to project beneath a front housing assembly portion, and a track member formed in a side wall of a rear housing assembly portion. Top and bottom face surfaces of the hooked projecting portion of the key, and top and bottom ledge surfaces of the track member are semi-circular in configuration. Interfitting surfaces of the front and rear housing assembly portions are also semi-circular in configuration. When the front and rear housing assembly portions are tandemly-positioned, and aligned with one another, the hooked end portion of the key and the track member engage with one another. Radial translation of the front housing assembly portion repositions the key projecting therebeneath at a fastening side of the track number to fasten thereby the front and rear housing assembly portions theretogether.

Abstract: The preferred embodiment of this disclosure is directed to an antenna connector for a cellular telephone, where such antenna may be rotated from a first position to a second position, such as "use" and "rest" positions, where the preferred rotation extent is about 90.degree.. The connector comprises a fixed support member and a circular housing member mounted therein for rotative movement between such first and second positions. The fixed support member is defined by first and second major faces having a circular opening extending therebetween for receiving the circular housing member, and at least one arcuate recess along the first major face adjacent said opening, where the length thereof extends between the first and second positions. The circular housing member includes a reduced diameter portion extending from one end thereof to an annular shoulder, where the reduced diameter portion is received within the circular opening up to the shoulder.

Abstract: The connection for releasably joining two drum components of a hydraulically-actuated double friction disc clutch includes first and second drum components having circular cylindrical surface directed substantially axially, one overlapping the other. The inner component is formed with a catch groove or two catch recesses and the outer drum component includes catch projections, offset mutually 180.degree. and adapted to become locked within the catch groove. The outer drum includes tabs at an axial end adapted to fit within recesses formed on the periphery of the inner drum between catch projections. The drums are driveably connected by applying oppositely directed axial force sufficient to snap the catch projections into the catch groove. The drums are disassembled by elastically deforming the outer drum until the catch projections clear the catch groove and then applying an axial force that separates the drums.

Abstract: A removable and reinsertible arrow cover for a sign stencil. The cover is equipped with an edge bevel, a tongue and an edge snap rail positioned remotely of the tongue to facilitate snap action insertion and removal as well as a snug, flush fit which provides a closed seal to the passage of light with an arrow shaped void in the stencil.

Abstract: For an articulation of a vibration damper for a washing machine the vibration damper has an articulated bush supported in a bearing. The latter has cheeks accommodating between them the articulated bush and having inlets for a bearing body leading to a bearing opening. The bearing body is retained in the bearing openings by means of an elastic locking mechanism in the direction of the inlets.

Abstract: A disk assembly is comprised of a circular plate having an outer flange portion extending in the radial direction and a plurality of tongues each of which is pressed out in the axial direction and an annular member whose inner radius is equals to that of each tongue, wherein each distal end of each tongue is snugly fitted in the annular member and the outer flange portion is fixed to one side of the annular member.

Abstract: Tools for the disassembly of a universal joint comprise two embodiments, a pull-type tool and a push-type tool. In the pull-type tool, a pulling force is exerted on a yoke member other than the yoke member from which a journal bearing is to be removed, an opposite pushing force is exerted on that end or collar portion of the yoke member containing the journal bearing to be removed, and a cylinder/piston combination interposed between the pulling assembly and the pushing assembly operates to cause the exertion of the pulling and pushing forces, so that the journal bearing is forced out of the collar portion adjacent to the pushing assembly. With respect to the push-type tool, a cylinder/piston combination is mounted on a pushing or support assembly, and the cylinder/piston combination is operated to force the piston downward so as to exert a pushing force via the pushing assembly on the universal joint cross, thus forcing the far side journal bearing out of its yoke member.

Abstract: A plug connector for use in a computer system comprised of an upper shell side-hinged to a lower shell by a connecting portion. The upper shell has pins respectively inserted into pin holes on the lower shell, a pair of opposite eye end posts side-matched to a pair of opposite eye end posts on the lower shell respectively and retained together by respective screw bolts, a pair of opposite semi-circularly notched upright blocks end-matched to a pair of opposite semi-circularly notched upright blocks on the lower shell in providing two round holes respectively aligned with the eye end posts for inserting and supporting the screw bolts.

Abstract: A display frame having a transparent viewing area comprising a face plate and a back plate provided with a tongue and groove engagement when assembled, adhesive material in the groove whereby to form a sealed chamber within which a picture and/or indicia are displayed, and a desiccant material in communication with the sealed chamber, thereby providing indefinite protection against moisture and dust.

Abstract: A mounting assembly for a movable annular wall member of an inlet passageway of a variable geometry turbine. The inlet passageway is defined between the movable wall and a facing wall. The wall member is formed from a sheet material and is supported on a plurality of pins which extend parallel to the direction of movement of the wall member. The wall member comprises a tubular portion extending away from the facing wall and each pin supports a radial extending projection having a pair of spaced tabs. Each tab is engaged in a respective slot in the tubular portion of the wall member, the tabs being a relatively close fit in the direction of movement of the wall member and a relatively loose fit in a plane at right angles to the direction of movement.

Abstract: Structural components for forming a space frame, particularly a geodesic dome structure, as well as a method of assembling the structural components is described in this invention. The structural components feature a connector having a slotted tubular member which extends into a transition area which, in turn, extends into a planar spade section. A structural conduit is positioned so as to abut the spade section and includes an inwardly extending wedge shaped protrusion that extends into a V-shaped recess formed in the transition area to lock the structural conduit with respect to the connector. Thus, when the structural conduit is placed in a state of tension, the wedge shaped protrusion acts to increase the outside diameter of the slotted tubular member so as to increase the compression of the slotted tubular member with respect to the inside surface of the structural conduit.

Abstract: A pipe bell or fitting socket is disclosed which includes an enlarged socket defining an interior, gasket receiving pocket. The enlarged socket terminates endwardly in a front socket terminus and interiorly in an interior terminus. An integral, outwardly extending, reinforcing ring projects radially outwardly from the outer periphery of the socket and provides increased body for socket strengthening purposes. The reinforcing ring may be medially positioned on the socket, may be endwardly positioned on the socket or may be otherwise positioned as best suited for the purposes of use. The reinforcing ring may be of any desired cross-sectional configuration, for example, square, triangular, rectangular or other cross-section.

Abstract: A steam turbine is disclosed which eliminates the transfer of thermal deformation from the inner cylinder to the stationary blade assemblies. A dual plane bolted connection and a free floating tongue and groove interface formed between the outer ring of the stationary blade assemblies and the turbine inner cylinder provided the clearance necessary to remove the deformation associated with the stationary blade assemblies, while supporting them within the turbine assembly. The outer ring of the stationary blade assemblies may either be formed as an integral component of formed from two sections which are then welded together. The present invention also permits the rotational blades of the turbine to be placed in close proximity to the outer ring of the stationary blade assemblies and the positioning of the flow guide on the outer ring, since the deformations due to the thermal deformation of the inner cylinder are now isolated and the deformation due to the stationary blade assemblies is eliminated.

Abstract: A drawer for an article of furniture has a pair of oppositely disposed sides which are parallel to the direction of movement of the drawer when the latter is opened and closed. Each of these sides is formed with an elongated pocket which is designed to receive a runner for the drawer. Such a runner includes an elongated support which is symmetrical about a median plane dividing the support longitudinally and can be mounted at either side of the drawer. In its mounted condition, the support extends in the direction of movement of the drawer. The runner further includes an elongated guide rail which serves to guide the drawer during movement. The guide rail is designed to be releasably connected to the support in such a manner that the guide rail extends in parallelism with the support and is prevented from shifting longitudinally relative thereto. The means for releasably connecting the guide rail to the support includes one or two grooves in the guide rail and one or two cooperating detents on the support.

Abstract: A clamping apparatus includes two tightening tools and a connecting unit. Each tightening tool has a base plate, a press plate, and an urging unit for tightening the base plate and the press plate while a member to be clamped is clamped therebetween. The connecting unit connects the tightening tools with the base plates facing in opposite directions so that the tightening tools can freely pivot relative to each other.

Abstract: This invention concerns a box-shaped base formed by wedge coupling two identical moulded plastic half-shells, for use in the construction of chairs, armchairs, tables or other types of furniture.

Abstract: A method of releasably connecting together strips of material comprising arranging the strips with surfaces facing each other and forming upwardly deformed areas of the strips above their planes and downwardly deformed areas of the strips below their planes, the deformed areas having intervening tie portions arranged at angles to the planes of the sheets, the tie portions being partially cut out to form tongues and interlining shoulders and remaining connected to the strips between deformed areas whereby upon relative longitudinal movement of the sheets, the tongues are displaced to seal against the shoulders and the inclined tie portions are adjacent to each other.

Abstract: An adjustment gear mechanism utilizing a plastic adjustment gear and integrally formed structures which securely retain a drive member. The plastic gear is formed to provide both a gear tooth arrangement which cooperatively meshes with a drive gear and an integrally formed adjustment member bore which provides prevailing torque for an adjustment member. The gear tooth arrangement on the plastic gear is formed to cooperatively mesh with a metal drive gear and withstand the tooth load and deflection applied by the metal drive gear. The drive member is non-adhesively retained by the integrally formed structures which maintain operative engagement between the drive member and the drive gear which it rotates. The structure and materials of the mechanism also provide adjustment-retaining purchase such that when a desired adjustment is achieved using the adjustment mechanism the adjustment resists disturbance by accidental, vibrational or other forces exerted upon either the drive member or the adjustment member.

Abstract: This invention relates generally to a garden tool quick handle connector and relates more particularly to a connection structure for quick connection of a handle to a garden tool wherein inner convex threads of the handle are conveniently arranged to engage with outer convex threads of the handle connector. A special retaining plate is movably provided to serve as a stop to maintain the handle in its engaged position with the garden tool and to protect the connection against torsional force.

Abstract: The invention relates to a method of securing a first part made of a thermoplastic material to a second part made of an electrically conductive material, a connector mode of an electrically conductive material being placed in the part made of a thermoplastic material and subsequently being welded to the part made of an electrically conductive material. A metal ball is used for the connector, which ball is inserted into an opening in the first part and is brought into contact with the second part, after which the ball is welded to the second part by means of a welding electrode.

Abstract: A bicycle safety turning device for installation upon a bicycle frame lower cross bar adapted to be engaged by the bicycle front wheel fork shoulder to limit the front fork from turning so far to the left or right as to be at a right angle to the forward movement of the bicycle and cause the bicycle to jackknife while riding. More specifically, the bicycle safety turning device consists of a pair of clamp members adapted to surround the bicycle frame lower cross bar, capped with clamp plates, and a pair of bolts bringing the two clamp plates and clamp members together, the bolts also holding a striker plate against which the front fork shoulder comes in contact after the front fork has turned through an arc of 35 to 45 degrees as desired. Encountering the striker plate, the fork is prevented from further turning.

Abstract: A device is provided for a screw connection between two pieces which can adjust the distance between the two pieces. The device comprises a first threaded piece and a second smooth piece with an annular groove close to its free end. A connector ring is screwed onto the threaded shank and engaged on the smooth piece. The connector ring has a groove of variable depth. An incompressible retaining ring is engaged in the grooves of the second piece and the connector ring. The device can be used to produce a single tension element.

Abstract: A novel lawn sprinkler comprises a substantially flat base of molded plastic with a hollow plastic, inverted cup-shaped housing supported thereon. The cup-shaped housing has an inlet pipe molded integrally therewith with a fixed female threaded fitting for connection to a garden hose and opening tangentially into the interior thereof. The cup-shaped housing has cylindrical side walls and a flat top wall with curved peripheral internal top edge. The top wall has a central spray opening which is small at the inside and tapers outwardly at the top surface of the top wall. The cup-shaped housing fits into and is cemented in place in a groove molded in the upper surface of the flat base and has a projection which fits a recess in the base to orient the housing on said base.

Abstract: Disclosed are methods and apparatus for controllably locking a shaft to a bearing surface moveable thereupon to permit or prevent axial movement of the bearing with respect to the shaft. In one embodiment an axially extending flap is formed in the shaft which is activated by a wedge to expand the diameter of the shaft and thereby lock the shaft to the surrounding bearing surface. In another embodiment a slot is formed in the bushing surrounding the shaft and the internal diameter of the bushing decreased with a wedge screw to lock the bushing to the shaft.

Abstract: An integral connection for a plastic water pump impeller includes a molded non circular plug and inwardly facing, radially flexible cylindrical wall in the center of the impeller, and a matching female socket and matching outwardly facing cylindrical wall on the end of the shaft. A rib on the impeller wall and groove in the shaft wall pop fit together and flex the impeller wall out as the impeller and shaft are push pitted together. The socket and plug prevent relative turning, and the rib and groove prevent the impeller from pulling off of the shaft.

Abstract: A pool exercise device includes a pair of supports having upright portions having a slot therein. End members having a regular angular geometric shape are removably positioned in the slots. Rods fixed to the end members project colinearly and are connected by a sleeve. The height of the rods is adjusted by removing the end members from the slots, selectively rotating, and returning the end members to the slots for securement therein.

Abstract: A clutch drum includes a cylindrical drum body having a spline portion consisting of plural extruded angles and extruded channels formed by pressing, and plural pressed-out portions formed at the spline portion, one side wall of the pressed-out portions having a continuous shape without any rupture, the other side wall of the pressed-out portions being formed by half blanking of the clutch drum body so as to stop a snap ring thereat.

Abstract: A sleeve joint for driving an impeller on a rotatable shaft includes a sleeve positioned between the shaft and the impeller and including at one end a closed groove which is positioned adjacent a corresponding groove in the shaft, the grooves jointly receiving a wedge permitting joint rotation of the shaft and the sleeve, and at the other end a pin for joining the sleeve and the impeller.

Abstract: A member for mounting a suspension rail for hanging exhibits such as paintings is adapted to be secured to a wall near the ceiling by screws. The member has a base plate and a supporting projection extending horizontally from the base plate. The base plate has a pair of inclined surfaces at both sides of the supporting projection. The projection is formed with a horizontal slit to form an elastic piece to facilitate the engagement of the suspension rail.