Abstract: A hidden screw-pressing structure for a pipe connector being comprised of a plurality of "C" shaped engaging members, springs and rotation covers on a plurality of opened ends of the pipe connector; wherein, the opened ends each is formed to have a diameter-reducing wall, the external wall of each engaging member is formed to have the same tapering surface as that of the diameter-reducing wall, an inner screw-pressing wall of the engaging member is formed a straight pipe wall, one of the springs abuts on the top of the engaging member and is subjected to compression of one of the rotation covers, screwing in of the rotation cover compresses the spring to push the engaging member inwardly, the inner screw-pressing wall of the engaging member thereby is given with a function for reducing diameter, in this way the walls of the pipes to be connected are bound by the inner screw-pressing walls, therefore, the pipes to be connected are bound in a hidden mode in the pipe connector without damaging the pipes themselv

Abstract: A quick assembling coupling system for bar structures consists of an annular disk containing a number of radial sleeves having their longitudinal axes distributed about the annular disk such that the ends of the bars are held in the sleeves by a prismatic lock cover inserted in the center of the annular disk.

Abstract: A rigid intersection connection, wherein an elongated longitudinal member, a first elongated lateral member, and a second elongated lateral member are joined by a one-piece rigid tie. The one-piece rigid tie joins the first and second elongated lateral members to the elongated longitudinal member with first, second, third, fourth, fifth and sixth fasteners. The one-piece rigid tie has a central web member to which three gussets attach. Each gusset in turn connects to two attachment tabs. The attachment tabs are disposed against the elongated members and are connected thereto by fasteners.

Abstract: Adjustable 3-way scaffolding fasteners for holding together four corners of a scaffold with four upright members, two first cross members with extremes, and two second cross members with extremes. The fasteners include a pair of right fasteners and a pair of left fasteners. Each fastener of the pair of right fasteners connects one extreme of the extremes of one cross member of the two first cross members and one extreme of the extremes of one cross member of the two second cross members to an upright of the four upright members of the scaffold, and are separate and diametrically opposed to each other when being used.

Abstract: A truss pitch break connector plate having a main body portion. A first stiffener flange projects generally perpendicular from one face of said main body portion along an arcuate first edge having an outer radius. A second stiffener flange projects generally perpendicular from the opposite face of the main body portion along a arcuate second edge having inner radius. The main body portion preferably is generally sector-shaped but alternatively it may be circular. The overall arrangement is such that the pitch break connector plate will accommodate top chords of different sizes; and is capable of maintaining the top chords at any one of a range of roof pitches.

Abstract: A tubular frame having a plurality of tubular members and a backing member. The tubular members are held together by round corner members. The corner members have hollow tubular insertion members or legs at one end and "X" or "cross-shaped" insertion members or legs at the other end in order to mate with adjacent tubular frame members. The two insertion members are adapted to be joined to a tubular member in only certain orientations which assists in manufacturing and assembly. The tubular frame members also have elongated channels on one side for mating with the backing member.

Abstract: A joint member is used for positioning a first square tubular section made of aluminum or aluminum alloy and a second square tubular section made of aluminum or aluminum alloy with the sections' end portions butting against each other so as to weld the butt end portions together. The joint member includes an angle retainment portion and first and second anchorage portions. The angle retainment portion is applied onto the outer or inner surfaces of walls of the first and second square tubular sections, the walls intersecting each other with an angle equal to or smaller than 180.degree. when the first and second tubular sections are caused to butt against each other. The first and second anchorage portions branch off and extend from the angle retainment portion so as to fixedly hold the walls of the first and second square tubular sections, respectively, in cooperation with the angle retainment portion.

Abstract: A connector device (20,60) for securing an additional rigid member (13,13'), such as a rod or tube, to a rigid member (12,12') of an existing assembly of rigid members comprises a body (21) having a first region (22) for securing relative to an end of a first rigid member (13,13') and a second region (23) adapted to cooperate with another add-on type connector device (20,60) to embrace a part of a second rigid member (12,12') and form a structural interconnection between the rigid members, the first region (22) of the body (20) having a major axis (28) which is substantially aligned relative to the length direction of at least an end portion of the first rigid member and the second region (23) having an end zone which at least in part lies substantially obliquely relative to the major axis and provides a recess (24) which locates part of the second rigid member (12,12').

Abstract: A metallic connector (48) secures the terminal end (50) of a first metallic tubular member (28) to an intermediate portion (52) of a second metallic tubular member (30). The connector (48) includes an end connection portion (54) having an opening (56) that receives the terminal end (50) of the first tubular member (28) and also includes a saddle portion (58) that extends from the end connection portion and receives the intermediate portion (52) of the second tubular member (30). Opposite ends (60) of the saddle portion (58) each includes a pair of spaced clamp attachers (62) for securing a clamp to permit the assembly by a connection (64) that includes a filler alloy (66) that is preferably a brazing material. The first and second tubular members (28,30) as well as the connector (48) are preferably made from stainless steel.

Abstract: A foldable chair has a seat support, a seat plate disposed on the seat support, a first support pipe disposed beneath the seat support, a second support pipe disposed beneath the first support pipe, a first knuckle connected to a first end of the first support pipe, a second knuckle connected to a second end of the first support pipe, a third knuckle connected to a first end of the second support pipe, a fourth knuckle connected to a second end of the second support pipe, a first leg tube connected to the first knuckle, a second leg tube connected to the second knuckle, a third leg cube connected to the third knuckle, a fourth leg tube connected to the fourth knuckle, a first leg pad connected to the first leg tube, a second leg pad connected to the second leg tube, a third leg pad connected to the third leg tube, a fourth leg pad connected to the fourth leg tube, a fifth knuckle connected to the seat support, a sixth knuckle connected to the seat support, a first spindle connected to the fifth knuckle, a sec

Abstract: A furniture leg includes a depression on the furniture leg's upper surface. The depression is designed to compress as the furniture leg is tightened against a furniture frame which prevents the leg from rotating. A method for assembly which includes attaching the furniture leg to a furniture piece is also included.

Abstract: A frame corner joining apparatus for joining two metal picture frame members at a predetermined angle to form a frame corner. The joining apparatus includes first and second legs disposed at the predetermined angle relative to each other, each leg receivable in a corresponding frame member channel. Each leg includes a fillet surface and a sloping surface, having a slot and a wedge piece with tab received in the slot. The wedge piece may be in two positions: an unlocked position in which the wedge piece is at the lowest point on the sloping surface, and a locked or raise position in which the top side of the wedge piece engages a surface of the picture frame. The wedge piece may be adjusted manually with needle nose pliers or automatically with a pneumatic device until the fillet surface of the frame corner joining apparatus tightly abuts the back lip edge of the picture frame member.

Abstract: An adjustable firewood rack is provided that includes a pair of horizontally disposed lengths of 2.times.4 lumber and four universal brackets each having a channel receiving an end of the lengths of 2.times.4 lumber. The universal brackets include a bottom wall, side walls extending from opposite sides of the bottom wall to form the channel, and flanges outwardly extending from the side walls at an open end of the channel. Interchangeably mounted between pairs of the universal brackets are U-shaped tubular supports and 2.times.4 lumber support assemblies. The universal brackets have both a two bolt-hole pattern for mounting the U-shaped tubular supports and a square four bolt-hole pattern for mounting the 2.times.4 lumber support assemblies. The 2.times.4 lumber support assemblies comprise a pair of vertically disposed lengths of 2.times.4 lumber and a cross member. The cross member includes another pair of the universal brackets to support the vertically disposed lengths of 2.times.

Abstract: A rod member connector including a coupling hole and a coupling tube adapted for holding two rod members of a folding chair at right angles, and two outward flanges raised from the periphery of the coupling hole at one side opposite to the coupling tube and defining a mouth adapted for holding a third rod member of the folding chair to secure the folding chair in the collapsed condition.

Abstract: A wheelchair frame assembly made by connecting a plurality of unit frames together, each unit frame including a plurality of metal frame tubes, and a plastic cover shell directly molded on the metal frame tubes, each metal frame tube having one end embedded in the plastic cover shell and an opposite end exposed to the exterior for mounting another element, the cover shell having a plurality of integral arm sections respectively connected between each two adjacent metal frame tubes, a plurality of integral rod sections respectively fitted into the embedded end of each metal frame tube, and at least one coupling portion for connection of a respective coupling portion of another unit frame.

Abstract: A CD rack includes at least two parts and each of the two parts has four connections, a first connection, a second connection, a third connection and a fourth connection. Each of the connections has a first tube extending upwardly therefrom and each of the first tubes has an inserting portion extending downwardly therefrom so that the inserting portions of one part are sized to be received in the first tubes of another part. The first connection and the second connection are located on one of two sides of the respective part and the third connection and the fourth connection are located on the other side of the respective part. Each of the first connection and the second connection has a second tube extending laterally from the respective first tube thereof and each of the third connection and the fourth connection has a third tube extending laterally from the respective first tube thereof so that the third tubes in one part are sized to be received in the second tubes of another part.

Abstract: The invention relates to a cabinet for receiving electrical and electronic equipment and subassemblies with facing parts, which comprises a frame of vertical, horizontal and transverse sectional bars interconnected by means of corner connectors.In order to obtain a particularly stable and secure cabinet, which also allows an extremely efficient manufacture and assembly, each corner connector is provided with through holes and guide elements constructed in the space coordinate direction for frontal reception and for the easy, reliable fixing of a sectional bar. In addition, each corner connector has a reception area for fixing a base. The base corner parts are preferably made from a one-piece, metallic flat material.

Abstract: A strutural connector hub for an exhibit booth. The connector hub provides for a double friction fit connector to secure various components together in place and further provides for a lock to additionally secure various components thereto.

Abstract: The present invention is a one-piece corner connector for structurally interconnecting in angular relation to each other two flat panels of a given thickness. The connector has a first connector sidewall oriented at an angle to a second connector sidewall. The connector also has a reinforcing tab which in relation with the first and second connector sidewalls forms a pair of channels into which rectangular panels are placed edgewise with each side face of each said panel engaged by either a connector sidewall or a reinforcing tab sidewall. Both side surfaces of each rectangular panel are secured to the corner connector using screws, nails, nuts and bolts, or an adhesive.

Abstract: A strongback for lowering a tie rod into the downcomer annulus of a boiling water reactor during a shroud repair operation. The tie rod strongback is suspended from a cable via a cable adaptor at its upper end. The lower end of the strongback is coupled to a tie rod adaptor, which in turn couples to the top of the tie rod. The strongback is a welded assembly of square tubes, channels for reinforcing the joints of the welded tubes, and upper and lower couplings. In particular, the strongback has mutually parallel first and second rigid linear members which are disposed vertically when the strongback is suspended from a plumb cable. The second rigid linear member is connected to the first rigid linear member by a relatively obliquely disposed third rigid linear member.

Abstract: A modular shelter comprising a framework for supporting a cover sheet, the framework including at least two frames each composed of an upward curved arch having two ends, two upstanding legs, each leg having an upper end connected to a respective end of said arch by means of respective upward angled connecting members, each arch end attached to a respective upper end of said legs, each leg having a bottom end, and anchoring means for anchoring the bottom end of each leg to ground.

Abstract: A piece of furniture (1) including an upper part (2) and a lower part, the lower part having rails (8) and legs (3, 4, 5, 6, 7,) made of tubes. The legs have an upper tubular end with a tubular connecting piece (9) fixedly connected with and forming an angle with the leg. An assembly device (10, 11, 12, 13, 14) is provided which has two connecting members (30, 31) each having at least two legs (21, 22), one leg of each member being inserted in an end of the connecting piece (9) and at least one other leg of each member being inserted in a tubular end of a rail (8), wherein one of the legs of the assembly device forms an angle with at least one other leg of the assembly device. The connecting members are pressed against an inner side of the tubular rails and connecting pieces by screws passing through holes in the legs of the connecting members, and the legs of the connecting members have a size and shape which substantially fills up an interior of the tubular ends.

Abstract: A framing system (10) is disclosed including three-dimensional structural members (12, 14) formed from planar panels (16) having their edges removably secured together by provisions (48) including slide connectors (66, 174) which receive lugs (52) slideably received in and abutting with latches (56). The panels (16) include interconnect ports (22) having integral, concentric tubes (24). The exterior faces (18) of the structural members (12, 14) are abutted together, with the structural members (12, 14) being clamped by a clamp (28) having a central wall (30) abutting with the tubes (24) and first and second side walls (32, 34) abutting with the free faces (25) of the tubes (24). Relative rotation is prevented between the clamp (28) and the structural members (12, 14) by detents (44) formed in the clamp (28) which are received in notches (26) formed in the free face (25) of the tubes (24).

Abstract: A connection device of screen fixtures involving a horizontal U-shaped top bar, a horizontal U-shaped bottom bar, at least one horizontal U-shaped horizontal bar, at least one I-shaped vertical bar with ribs on both inner sides, and at least one L-shaped object having a short leg and a long leg and having a frame at the intersection of the short leg and the long leg, the long leg having two screw holes for attaching the long leg to a vertical bar by two screws, the short leg having a screw hole for attaching the short leg to a top bar or the bottom bar by a screw.

Abstract: A flag staff assembly includes an elongated flag staff adapted for the support of a flag thereon and a re-angulating staff assembly with male and female ends permitting selective positioning of the flag staff therefrom.

Abstract: A one-piece, multi-functional gripping connector is disclosed, to be used as a shower curtain rod attachment in conjunction with a standard shower curtain and curtain rod assembly, to allow the end or ends of the curtain to be turned inward, thereby preventing water from spraying out of the shower enclosure. The sole point of support for the attachment is its connection to the shower curtain rod. The invention is comprised of a single sheet of strong, flexible, elastic material, such as PETG thermoplastic, which is formed into an open-sided, open-ended, tubular shape having rounded edges, and which is also notched and bent 90-degrees at the mid-point to form an elbow configuration. Installation is by hand, without use of tools, and will not damage existing surfaces. Removal of the shower curtain rod is not required. Alternate embodiments are also disclosed, which provide illustrations of the invention's multi-functional aspects.

Abstract: A connector for a studded T-post comprises a tube having an internal keyway therein. The keyway slidingly receives a studded T-post and is configured to prevent relative rotational movement of the post within the tube when the post is inserted into the tube. A locking member passes through the tube and cooperates with studs of the T-post to inhibit longitudinal movement of the T-post within the tube. A second similar tube may be attached to the first tube such that two T-posts may be inserted in the respective tubes and supported relative to one another in any number of angular orientations, thereby providing support for a wire-formed trellis.

Abstract: A wheelchair frame assembly made by connecting a plurality of unit frames together, each unit frame consisting of a plurality of metal frame tubes and a plastic cover shell directly molded on the metal frame tubes, each metal frame tube having one end embedded in the plastic cover shell and an opposite end extended to the outside for coupling, the cover shell having a plurality of integral arm sections respectively bridged over each two adjacent metal frame tubes, a plurality of rod sections respectively fitted into the embedded end of each metal frame tube, and at least one coupling portion for connection to a respective coupling portion on the wheelchair.

Abstract: A connector assembly for releasably interconnecting a plurality of elongated hollow bodies at an angle to each other, comprising a rigid connector element having a central base portion and a plurality of mutually angular legs extending from the base portion, a plurality of partitions or partial partitions carded by the base portion, each partition having an opening for receiving a shank type of fastener and further including at least one elongated hollow body, a boss integral with and disposed within the interior of the hollow body for receiving the shank of a fastener which is received in the opening in the partition.

Abstract: The invention concerns a transom construction for the mounting between two glass panes, in particular window glass panes, in which the transoms that are assembled to form a transom cross consist of hollow profiles and at least two transverse profiles that are flush with each other are attached to a main hollow profile at a predetermined angle to create a transom cross and encompass the main profile in an overlapping manner. The connection of the hollow profiles to the transom construction is executed with the aid of connecting elements with insertion openings that extend in the longitudinal direction and can be solidly inserted into the transverse hollow profile. A four-edged connecting pin is also provided, which penetrates the insertion opening in the main hollow profile and is fitted into the recess in the connecting elements.

Abstract: The present invention provides a system for joining two furniture panels to prevent relative vertical movement there between. In a first embodiment for joining two furniture panels disposed at right angles, the invention comprises two forks. The primary fork comprises an elongated base having three coplanar equally-spaced tines arranged along the length of the base and extending from the base in a direction perpendicular to the length of the base. The primary fork also includes three coplanar equally-spaced slots extending through the base in a direction perpendicular to the direction of the tines. The second, or locking, fork comprises an elongated flat planar body having two faces and three flat elongated coplanar equally-spaced tines arranged thereon. The tines are arranged along the length of the body and protrude from one edge of one face of the body, to extend in a direction perpendicular to the length of the body.

Abstract: A clamp assembly for joining perpendicularly arranged, square, elongate, structural members to form a framework. The clamp assembly comprises a pair of shaped gripping members aligned in confronting relationship respective one another and have opposed parts that form opposed sockets which are arranged perpendicular to one another. One of the sockets receive an end of one structural member therewithin, the other of the sockets receive a medial length of another structural member therewithin to secure the perpendicularly arranged structural members together. Each gripping member is of unitary construction and has a planer surface that is divided into a first socket forming member and a second socket forming member by a through bolt extending perpendicularly therethrough.

Abstract: A flat elbow/one direction tee fitting having a hollow generally L-shaped body including a pair of angularly spaced apart legs joined at a corner and partially defined by rectilinearly extending outer sidewalls and an arcuate inner sidewall. Each of the two legs has a raceway receiving opening at its free end. The corner defines a knockout which is removeable to form a third raceway receiving opening. The body is defined by a mounting base and a cover releasably retained in snap together assembly with the mounting base.

Abstract: A shaped connecting member or piece for connecting structural profile members, in particular door or window casement sections, includes at least one attachment leg that can be inserted into an attachment chamber of the structural profile member and fixed in position therein. To make fabrication of the shaped connecting piece and its application as simple as possible, at least one resilient element is provided in the at least one attachment leg to project beyond a side surface thereof. When the attachment leg is inserted into the attachment chamber, at least an outer segment of the resilient element gives way elastically inwardly and blocks the attachment leg from being pulled outwardly from the attachment chamber.

Abstract: A connector having a horizontal channel member and a vertical channel member connected to the horizontal channel member. The vertical member has a lengthwise hole formed therein for receiving a screw. The vertical channel member is connected at a midpoint of the horizontal channel member such that the vertical channel member and the horizontal channel member form a T-shape protrusion. The vertical and the horizontal channel member are attached to a backplate which circumscribes the members. The connector is inserting into a T-shaped channel in a perimeter edge of a second sheet of composite material. A hole formed in a first sheet is positioned over the hole in the connector and a screw is driven into both holes firmly attaching the first sheet to the second sheet.

Abstract: A space frame for an automotive vehicle includes at least one longitudinally extending structural member and at least one rocker including a structure forming channels on at least two sides, one of the channels receiving the structural member and an adhesive and/or sleeve for securing the structural member to the rocker.

Abstract: A lightweight steel/wood earthquake brace for existing or new residential garage front wall. In the preferred embodiment, folded sheet metal legs are bolted together to form a rigid L-bracket. Symmetrical L-brackets are bolted to the garage door wood header and to the concrete footing to stiffen the wall against wind or earthquake. In another embodiment the steel members are connected with protruding tabs and holes.

Abstract: A tent for screening the sunlight. The tent comprises a main sheet for screening the downwardly radiating sunlight, a plurality of front and rear tent poles for causing the main sheet to maintain its suspended shape, a plurality of ropes for being stretched to impart a tensile force to the main sheet, a pole support for supporting the tent poles as well as dispersing the vertical force generated in the poles and a detachable side sheet for intercepting the side radiating sunlight. The pole support comprises a base and a pair of pole support pipes which receive lower ends of the pipes. The base is embossed at its under surface with a raised figure to improve the frictional force between said pole support and the ground surface. The pole support pipes concentrate in the center of the base to have a V shape in cooperation with each other.

Abstract: A cover to cover the upper rail of a railing. The upper rail has a top, bottom and side. The cover has a curved top with a concave inner surface to be positioned adjacent the top of the rail. The longitudinal ribs on the inner surface. The side walls to be positioned adjacent the sides of the upper rail. There are flanges on the bottom of the side walls to contact the bottom of the rail to locate the cover on the rail.

Abstract: A torque box for a space frame on an automotive vehicle having at least a pair of spaced vertically extending structural members includes an inner panel, and an outer panel spaced from the inner panel and substantially parallel thereto. The torque box includes a plurality of interior panels extending between and interconnecting the inner and outer panels. The inner and outer panels and interior panels cooperate to form a spaced ends which are secured to the structural members.

Abstract: An edge joint particularly adapted for use in boat construction and furniture construction due to its high strength and aesthetically pleasing appearance due to the elimination of external structural reinforcements such as chine logs and hardened fillets. The high strength non-reinforced edge joint comprises two bilaminated plywood panels positioned together at an angle between about 60.degree.-170.degree.. Each panel defines a V-shaped groove along one side thereof so that one leg of each of the grooves is in contact with a corresponding leg of the other groove and the second legs of the grooves are spaced-apart so as to form an open cavity at the juncture of the panel. A cementitious material fills the cavity so as to form the edge joint as well as the protected outer corner thereof.

Abstract: A tent frame permits the roof and walls to be separately established, with consequent ease of erection.

Abstract: A vehicle chassis constructed of metal frame elements which are joined together by connecting node elements (connectors). The node elements are configured as upwardly open molded pieces (shells) When assembled, a bottom surface portion of each node element is received in conforming notches disposed adjacent the outwardly facing end surfaces of the joining ends of abutting frame elements in such a manner that no part of the node element forms the inward facing regions of the vehicle frame defining the windscreens and door openings. Each node element is provided with side projections (tangs) which extend beyond the notch portions of the adjoining frame elements to increase surface contact area between the node element and each frame element. A cover plate or the vehicle body skin is provided to cover the upward facing end of the node element.

Abstract: A friction fit mounting bracket for use in construction of structures employing metal stud frames which when joined form an angled relationship. The friction fit mounting bracket is formed to receive the longitudinal edge of adjacent metal studs in a friction held relationship for position and holding those studs in a vertical relationship at a selected angle therebetween. One embodiment of the mounting bracket includes a multi-part structure formed from metal or plastic.

Abstract: A fastener having a vertically disposed spine and a leg member disposed spaced from the spine and joined by a connector and a protuberance projecting from the spine and above the connector.

Abstract: A hanging file frame system adapted to accommodate conventional hanging file folders comprising two side rails, two cross member rods and two hoops joined together by four modular joint supports. The side rails are of relatively flat stock with a plurality of breakaway notches in one end. The cross members and the hoops are formed from round bar stock of the same diameter. The cross members are round bar stock of a predetermined length. The hoops are bent from a single piece of stock forming a foot section, uprights at either end of the foot section, two terminating horizontal tangs and barbs on each tang. The modular joint supports are interchangeable and constructed of a resilient but somewhat flexible plastic. The supports comprise minor bosses in a horizonal orientation whenever the hanging file frame is assembled with internal keyways running parallel with the central axis of the minor bosses, and a major boss formed in the side of the support.

Abstract: This invention relates to a profiled strip adapted to be used for making the join between two surface coverings making therebetween a determined re-entrant angle, wherein this profiled strip comprises: two bearing sole plates which are made of a hard, semi-rigid material, which are each adapted to be placed below one of the surface coverings and which each present an extension extending in a direction offset angularly by substantially 90.degree.; and a connecting bridge which connects the extensions, which is made of a supple material and which maintains the bearing sole plates angularly offset with respect to the re-entrant angle.One application of the invention is the production of a profiled strip for joining the tiles of two vertical walls.

Abstract: A handlebar, particularly for cycles, such as, for example, bicycles, is of the type including formations for supporting the cyclist's elbows. The support formations are mounted on the rear ends of side elements of the handlebar which project rearwardly and outwardly from the main cross member of the handlebar which is intended to be connected to the steering column. When the cyclist grips the front ends of the handlebar, he can thus rest his elbows in the formations, keeping his elbows spaced apart in a position generally to the rear of the cross member of the handlebar. The preferred application of the handlebar is to sports cycles.

Abstract: A foldable, easily stored stand for supporting a leaf bag or the like, the stand comprising upper and lower bag retainer rings made up of tubular components. These tubular components are formed in such a manner that the bag retainer rings take on an essentially circular configuration. The bag retainer rings are interconnected at spaced apart locations by a pair of straight tubular components forming column members of equal length, with the opposite ends of one of the column members being hingedly connected to a first location on each of the bag retainer rings. The opposite ends of the other of the column members are hingedly connected to a second location on both of the bag retainer rings, with the second location on the bag retainer rings being at a substantially opposite position on the bag retainer rings with respect to the first location.

Abstract: A corner connector (10) for connecting adjacent first and second spacer sections (20, 22), to form an insulated panel spacer frame includes a first arm (12) joined by a flexible joint (15) to a second arm (14). The second arm includes a recess (44) adjacent the joint, and a deformable projection (46) projecting from an edge of the open face of the recess inwardly toward the bottom of the recess. The first arm includes a securement projection (38) protruding from adjacent the joint (15) that is receivable within the recess of the second arm alongside the deformable projection. The deformable projection is deformed by the securement projection and exerts a compressive force on the securement projection to releasably secure the first and second arms in a desired angular orientation.