Abstract: A support system for mounting a door, such as a pocket door, on an overhead track is disclosed. The system cooperates with carriage that includes a support rod having a discontinuity at a lower end. The system uses bracket that is adapted for mounting along the upper edge of the door, and an engagement bar that is adapted for engaging the discontinuity on the support rod, so that the door is suspended from the track through the carriage by inserting the discontinuity through the bracket and engaging the discontinuity with the engagement bar, trapping the lower end of the support rod through the aperture in the bracket.

Abstract: A sliding door assembly is disclosed for use in an environment where both sides of the door are useable. The door assembly includes at least one bottom roller mechanism fitted into a lower portion of a bottom rail. The bottom roller mechanism is adjustable and concealed within the bottom rail. The door assembly further includes at least one top roller mechanism fitted into an upper portion of a top rail. The top roller mechanism is concealed in the top rail.

Abstract: A movable door mounting assembly includes a stud assembly and a trolley assembly having a spring-biased cam piece that pivots between a normal position, which allows the trolley assembly to move freely on the track, and a locked position, which causes a locking surface on the cam piece to frictionally engage with a top surface of the track and hold the trolley assembly in place while the door is being hung. A catch in the stud assembly engages with the cam piece when the mounting assembly is fully assembled. Inserting the stud assembly into the trolley assembly, releases the cam piece from its locked position and, at the same time, positions the catch so that it engages with the cam piece when the door is hung.

Abstract: The invention includes a clasp that can be mounted to the roller track of an overhead door and a shim that can be mounted to the overhead door or the shaft of the roller. The clasp includes a portion for attaching to the roller track and a blocking portion that is secured in proximate location to the inner surface of the overhead door. When the overhead door is in a closed position, the shim and the blocking portion are engaged thereby encouraging the overhead door towards the door frame. Multiple clasp and shim assemblies can be mounted to the overhead door to improve the seal between the overhead door and the door frame.

Abstract: A rail structure for doors comprises a track rail body (3) which supports the door wheels (4) which are attached to a door (6) and freely roll on the track rail body (3), a load support member (2) which is extended along the track rail body (3) and supports the track rail body (3) from the bottom side, a cushion member (7) which is disposed between the track rail body (3) and the load support member (2) and absorbs the vibration from the track rail body (3). A convexo-concave fitting part (8) which performs convexo-concave fitting is formed on the bottom surface of the track rail body (3) and on the upper surface of the load support member (2) via the cushion member (7). Purposes of the invention are to prevent vibrations caused by the running of the door wheels (4) from being transmitted to building, and to improve the efficiency of replacement operations for the track rail body (3), and to lower the cost.

Abstract: A side sliding door apparatus for an electric railcar includes a side sliding door suspended from a horizontal door rail with a C-shape cross-section. The side sliding door is capable of moving freely via a door roller, and a gap is formed between the door roller and a ceiling of the door rail. A guide roller with a smaller diameter than that of the door roller is provided adjacent to the door roller. A gap between the guide roller and the ceiling of the door rail is set to be smaller than that between the door roller and the ceiling of the door rail. Preferably, a gap adjusting mechanism is provided for adjusting the gap between the guide roller and the ceiling of the door rail.

Abstract: A bracket that conveys repeated lateral forces on a bi-fold door from an overhead channel on a bi-fold door doorjamb through a common peg and roller to the bi-fold doors without damaging the door. The bracket comprises a horizontal edge plate and a broad vertical brace plate meeting orthogonally at a bracket corner. The horizontal edge plate has a vertical tubular post extending upwardly therefrom for receiving the peg and roller. Alternatively, the horizontal edge plate may have a hole no larger than the drilled hole in the door top edge in which the peg may be is received. To align the brace plate hole with the door hole the bracket may include a vertical edge plate orthogonal to both the horizontal edge plate and the vertical brace plate, extending between them. The vertical edge plate then measures the distance from the door side edge to the door hole as the same distance between the bracket vertical edge plate and the bracket peg hole.

Abstract: A method of assembling a sectional upward acting door comprising plural generally planar door panels adapted to be guided between opposed guide tracks. The door panels are provided with hinge assemblies including a hinge plate mounted on the upper edge of one door panel with a pin receiving bore and a cooperating hinge plate with a hinge pin formed thereon mounted on the lower edge of the adjacent panel. One panel may be placed between the guide tracks and suitably supported while the next panel is assembled to the already positioned panel by placing the next panel between the guide tracks and moving it vertically downward to engage the hinge plates on the respective panels. The cooperating hinge plates are configured for snap together engagement which may only be released by intentional manipulation of the hinge plate with the pin receiving bore.

Abstract: The present invention includes an apparatus for guiding movement of an object along a track. The apparatus includes an attachment member defining an opening. A bushing is positioned in the opening and the bushing is laterally moveable within the opening. A plunger is attached to the bushing and the plunger is configured to move towards and away from the bushing. A guide mechanism is pivotably attached to the plunger and the guide mechanism is moveable along the track. According to other aspects of the invention, a slider is used in combination with a roller as the guide mechanism.

Abstract: A pulley cradle arrangement for a screen doors, in particular, having a pulley cradle receptacle (23) that is inserted from above into a hollow frame section (1) and is clamped there. The pulley cradle receptacle (23) holds the pulley cradle support (25), inside of which the pulley cradle (27) and its running rollers (28) can be shifted vertically by a knurled screw (89). All parts can be pushed together without the use of tools and snap together by means of elastic holders. The pulley cradle (27) can be removed from the pulley cradle support (25) by pushing on its front surface and thus the sliding door can be removed from the guide rails.

Abstract: A movable door mounting assembly includes a stud assembly and a trolley assembly having a spring-biased cam piece that pivots between a normal position, which allows the trolley assembly to move freely on the track, and a locked position, which causes a locking surface on the cam piece to frictionally engage with a top surface of the track and hold the trolley assembly in place while the door is being hung. A catch in the stud assembly engages with the cam piece when the mounting assembly is fully assembled. Inserting the stud assembly into the trolley assembly, releases the cam piece from its locked position and, at the same time, positions the catch so that it engages with the cam piece when the door is hung.

Abstract: The present invention involves a four (4) wheel trolley used in a track and trolley system which allows the trolley to move smoothly along a track, bear and carrying heavy movable wall panels, and minimize the stacking depth of the movable wall panels when such panels are stored. The trolley includes trolley discs that define an outer circumferential groove. The outer circumferential grooves allow the trolley discs to maintain a lubricant reserve so that the trolley discs may move smoothly along the track. While the trolley may carry heavy loads, because of its relatively small size, the trolley minimizes the stacking depth of movable wall panels in their storage positions.

Abstract: A track and trolley system for movable wall panels including a track having upper and lower flanges, the upper and lower flanges being horizontally and vertically displaced from each other and defining a channel therebetween, the upper and lower flanges each having a disc-supporting surface; a carrier shaft disposed between the flanges and adapted to engage the wall panel; and a trolley having upper and lower discs rotationally mounted on the shaft, the upper and lower discs each having a lower surface supported on the disc-supporting surfaces of the upper and lower flanges, respectively, and each of the upper and lower discs including an outer edge and a center, each of the lower surfaces sloping upwardly from the outer edge toward the center, each of the lower surfaces including a contact portion adjacent the outer edge and engaging the disc-supporting surface.

Abstract: A door truck which has a one piece frame and plastic wheels for operation in an overhead track for supporting a door in which the wheels are mounted to the frame with barrel nuts and a threaded stud. The frame has a door supporting portion through which a pendant nut can be extended with its head mounted upwardly or downwardly so as to support a door.

Abstract: A running carriage arrangement (1) includes a housing receptacle (5) and a housing (9) embedded in it. The running carriage (7) can be vertically shifted within the housing (9). The shifting of the running carriage (7) is accomplished by an adjusting wheel (39), which can be rotated by hand and by which the running carriage (7) can be adjusted relative to the housing (9) and the sliding door (3).

Abstract: A pulley cradle arrangement for a screen doors, in particular, having a pulley cradle receptacle (23) that is inserted from above into a hollow frame section (1) and is clamped there. The pulley cradle receptacle (23) holds the pulley cradle support (25), inside of which the pulley cradle (27) and its running rollers (28) can be shifted vertically by means of a knurled screw (89). All parts can be pushed together without the use of tools and snap together by means of elastic holders. The pulley cradle (27) can be removed from the pulley cradle support (25) by pushing on its front surface and thus the sliding door can be removed from the guide rails.

Abstract: A track system for a movable panel, such as a companionway door on a boat, allows adjustment after installation of the tracks for the panel, and allows the panel to be removed without removing the tracks. Typically a number of adjustable slide block assemblies are utilized each including a slide block of a low friction material (or a wheel on a shaft with a ball bearing mount) and a panel mounting element, the position of the slide block being adjustable with respect to the panel mounting element in a dimension non-aligned with the dimension of the elongation of the tracks.

Abstract: A track and trolley system for an operable wall panel which provides for linear motion. The track is mountable to a ceiling of a room and includes first and second surfaces. The trolley is attachable to the operable wall panel and includes first and second rotatable wheels that respectively engage the first and second track surfaces. The outer radial peripheries of the rotatable wheels and the engaged track surfaces are complementarily structured and arranged to limit movement of the first and second rotatable wheels relative to the surfaces of the track in the direction in which the axis of rotation of the track extends, while allowing the wheels to rotate about their axes of rotation and roll along the track surfaces.

Abstract: A running mechanism assembly includes a profile element (5) whose hollow space (10) with the guide groove (9) is laid bare by a recess (15), which makes possible the perpendicular insertion of the running mechanism (19). The running mechanism (19) is locked within the guide grove (9) by displacement within the latter.

Abstract: Apparatus for use in mounting a door on an overhead track comprising a carriage assembly constructed and arranged to be moved horizontally along the track in such a way as to limit upward movement thereof, and a door mounted assembly constructed and arranged to be mounted on an upper edge of the door so as to be moved with the door. The door mounted assembly is movable with the door (1) into an initial position wherein a locking member on the carriage assembly is in an initial vertically aligned position with respect to a locking member receiving opening on the door mounted assembly and (2) from the initial position upwardly with a snap action into a locking position wherein the locking member is in a locking position within the opening.

Abstract: An improved trolley for use on a track. The improved trolley is of a sandwich construction having a wear resistant interior and a pair of metal end plates. The wear resistant material is preferably plastic or other material designed to avoid damaging a track along which the trolley rides. The end plates are preferably stainless steel and of a diameter greater than the diameter of the center wheel to prevent the trolley from becoming dislodged from a track. By providing a sandwich of long wearing and non brittle materials, the longevity of the trolley is increased and corrosion concerns associated with prior art devices is substantially alleviated.

Abstract: An overhead door having two tracks each of which is designed to be mounted on the side of an opening in a building. Each track has a script-v shape in cross-section, and a groove or channel that runs along its longitudinal axis. One or more panels are positioned between the tracks and coupled to each other. Each panel has a multiple-layer design that provides superior insulation. At least two plungers are positioned on each panel and each plunger has a first end which is biased in a first position. In the first position, the first end of the plunger rides within the channel of the track. The plungers are designed with a low-friction tip that wears away after repeatedly traveling in the channel of the track. The plungers may be designed to release from the track when the panel on which they are mounted is impacted, to rotate in whole or in part as they travel in a channel of a track, or both.

Abstract: A connection system for interconnecting various components, such as components of an overhead garage door system, is provided which includes, in one aspect, a first component having a pair of spaced apart hook members, an intermediate guide member and a detent extending from a planar body of the first component. A second component includes a pair of spaced apart apertures which are shaped and aligned to receive the hook members, and an intermediate aperture which is shaped and aligned to receive the guide member upon registration of the first and second components in face-abutting relationship. As the first and second components are translated relative to each other, the detent of the first component engages the intermediate aperture of the second component to thereby establish a connection between the first and second components. Connection of a roller bracket to a door stile of an overhead garage door system is provided by the novel connection system, as well as connection of a door stile to a door panel.

Abstract: A wheeled top guide for rolling movement of a door along an inverted U-shaped track includes a housing for mounting on the door with an upwardly extending axle and a roller thereon for rolling engagement with one side wall of the trace. A vertically oriented torsion member is seated in the housing and has a vertically extending elongated torsion rod having its lower end fixed on the housing, a horizontally extending arm having one end secured to the upper end of the torsion rod and extending away from the first shaft, and an upwardly extending axle adjacent the other end of the arm. A second roller on this axle is in rolling engagement with the other side wall of the track and is spaced from the first roller.

Abstract: A hinge for a sectional overhead door. The hinge having first and second hinge parts. The second part has side flanges and a connecting base. The first part has a body and an integral sleeve of a length greater than the distance between extremities of the flanges. The side flanges have opposed apertures. The sleeve is received by the apertures as the side flanges are configured to extend substantially at right angles to the base.

Abstract: A fitting for holding rollers of roller pull-out guides, for the rear wall of drawers, below the bottom and next to a side wall of the drawer, and protruding beyond the underside of the bottom. The longitudinal edges of the bottom of the drawer are held in grooves in the respectively assigned side walls of the drawer. The roller is rotatably mounted on a bearing flange section of the holding fitting, which can be mounted on the drawer. The bearing flange section protrudes downwards at right angles from a panel-shaped supporting flange section that can be fastened in horizontal abutment to the underside of the bottom of the drawer at a distance from and parallel to the side wall of the drawer. At least one matching flange section is provided at a distance from the bearing flange section and essentially parallel to the supporting flange section.

Abstract: A sectional door (20) having a plurality of panels (21, 22, 23, 24) including, a body portion (25) of the panels spacing and joining longitudinal edges (40, 50), one of the edges (40) between adjacent panels on a first panel having a substantially concave curvilinear surface (45) in vertical cross-section, the other of the edges (50) between adjacent panels on a second panel having a substantially planar surface (52) in vertical cross-section, longitudinally-spaced hinges (65) interconnecting the first and second panels for pivotal movement.

Abstract: A bottom bracket for an overhead garage door having a spring tension assisted lift system. The bottom bracket has protrusions that interlock with mating slots in the stile of the garage door bottom panel thus preventing the bracket from detaching from the garage door when the bracket is attached to the spring under tension, even if the bracket fastening screws are removed.

Abstract: A bottom fixture for overhead garage doors which can be selectively installed on the lower portion of either the right hand or left hand side of the garage door. The bottom fixture is an L-shaped bracket having a wide flat side and a narrow flat side at right angles to one another. A first pair of parallel laterally spaced ear members and a second pair of parallel laterally spaced ear members extend perpendicular to the same surface of the wide side and each pair is spaced a predetermined distance from the top and bottom ends of the bracket and each pair of laterally spaced ears has axially aligned apertures on a horizontal axis to receive the shaft of a roller device having a roller rotatably mounted at its outer end. A first and second sheave extend perpendicular to the same surface of the narrow side on a horizontal axis and are spaced from the top and bottom ends a predetermined distance and are configured to receive a cable.

Abstract: An improved adjustable center door pivot assembly is disclosed which can be mounted to a threshold without the need for a separate mounting bracket. The adjustable center pivot assembly permits the height of the pivot spindle to be adjusted without removing the door. Further, the height of the adjustable center pivot assembly which projects above the threshold is sufficiently short that the pivot assembly can be used with a standard door having a standard 21/32" web.

Abstract: This invention pertains to a retractable roller-hinge assembly for use with retractable overhead doors. More particularly, this invention relates to a novel roller-hinge assembly which when installed on conventional retractable overhead doors, such as garage doors warehouse doors or truck doors, enables the door panels to pull away more quickly from the door frame as the overhead door is raised, or lowered. A hinge assembly for connecting upper and lower panels of a retractable overhead door comprising: (a) upper devices for securing to the upper panel; (b) lower devices adapted for securing to the lower panel, the lower devices being hingedly connected by a pivotal axis to the upper devices; (c) roller and roller axle devices rotatably connected to the upper devices, said roller and axle devices being adapted to move towards the lower devices as the upper devices are pivoted about the pivotal axis.

Abstract: A hanger wheel mount wherein the mounting pin includes an annular land for contacting only a portion of the wheels interior surface. The use of the annular land reduces the pull required to move a door suspended by a hanger bracket. The roller or wheel includes an inturned lip which contacts a portion of the pin adjacent the bracket to reduce wheel wobble.

Abstract: A trundle trolley for supporting a door for sliding movement in a tubular track assembly, the trolley including a roller section and a carriage section pivotally mounted on the roller section, the carriage section including a slot on the lower edge and the door including hanger bolts along the top of the door, one hanger bolt being aligned in the slot in each carriage section. Brackets are provided on each carriage section to capture the bolt in the slot in the carriage section.

Abstract: Roller for rolling drawer guides with a wheel journaled on a stud (24) fastened to the running and/or guiding rail of the drawer guide, the wheel having a rim concentric with the longitudinal central axis of the stud (24). The wheel is divided into a hub (16) journaled on the stud (24) and a rim (18) disposed concentrically on the hub, and the rim (18) is mounted on the hub (16) for displacement in the direction of the roller axis of rotation. The rim (18) is held on the hub (16) preferably against rotation in the direction of rotation of the roller.

Abstract: The fitting for sliding doors includes a longitudinal groove extending in its mounted state in the longitudinal direction of the upper edge of the door which groove has two upper flanges covering the groove only partly. This allows a mounting of a sliding door and a hooking thereof onto a runway rail without the need of a lateral clearance.

Abstract: A roller assembly is provided as an easily replaceable assembly for use with a sliding door. The roller assembly includes a roller or wheel mounted in a roller housing and carried in a cantilevered manner at one end of a leaf spring. The opposite end of the leaf spring is permanently bent to form a hook which is engageable with a mounting tab on an upper or lower door edge through a mounting insertion gap in the door edge such that the leaf spring extends across a bearing tab. When the hook is engaged on the mounting tab the roller is carried in a roller receiving pocket in the door edge such that the leaf spring bears against a bearing tab. The leaf spring allows the roller to move into and out of a roller receiving pocket to accommodate imperfections and obstructions in a stationary track on the door frame in which the roller travels.

Abstract: A sliding door roller apparatus includes a replaceable wheel assembly that can be easily removed and replaced on a holding member. The wheel assembly includes a resilient housing, a wheel, and an axle on which the wheel turns. The resilient housing has a pair of opposite facing sidewalls, each having an integral end portion that extends toward and overlaps the other. Each end portion includes at least one locking finger that is positionable within an opening on the holding member. The resiliency of the housing permits the locking fingers to be placed or removed from an opening located on the holding member.The apparatus also includes an adjustment mechanism that positions the wheel assembly outside the sliding door frame to permit the frame to be properly aligned within its door opening.

Abstract: The assembly comprises two, snap-together pieces which, following their clinched or latched engagement, are freely rotatable relative to each other. One of the two pieces comprises a sleeve which has an inner annular land, and the other of the two pieces comprises a rod having flexible extending fingers which terminate in outwardly-directed, land-engaging and latching lugs. The rod is slid into the sleeve, with the lug-ended fingers entering first, and, consequently, the fingers are resiliently forced inwardly until the lugs reach the land. Then the fingers spring outwardly while the lugs latch onto the land. This latching together of the pieces requires no tools.

Abstract: A wheel retainer prevents a wheel of a sliding or bypass door from jumping off of the floor track on which the wheel rolls. Portions are provided on the lower portion of the retainer for slidably engaging a downwardly facing portion of the track for inhibiting upward movement of the retainer from the track. Preferably this in the form of an L-shaped hook having a base wider than the opening of a dovetail slot in the track and a neck narrower than the opening of the slot. The retainer can then be installed only by pivoting the retainer relative to the track for inserting the hook. The retainer also has portions for engaging an upper portion of the wheel to prevent it from being lifted from the track. The preferred embodiment is a D-shape with an arcuate portion over the top of the wheel and barbs that prevent the retainer from accidentally being dislodged from the wheel.

Abstract: A kit for enabling one person to easily and efficiently remove a truck cap from over a truck bed. The cap is provided with hold down bolt holes. The lot includes detachable forward rollers for attaching to and detaching from a forward portion of the truck cap, and for rollingly engaging the truck bed and maintaining the truck cap in rolling engagement with the truck bed when the detachably forward rollers are attached to the truck cap and when the truck cap is disposed over the truck bed. The kit also includes detachable rear wheels for attaching to and detaching from a rear portion of the truck cap and for providing the truck cap with rolling mobility upon removal of the truck cap from the truck bed.

Abstract: A wheeled track-mounted carrier in one use mode supports a shower curtain through a color-coordinated button having a shank received through a grommet on the shower curtain. The button is removably connected with the body of the carrier which is suspended removably from the axle of a dual wheel track follower. In a second use mode, the color-coordinated button is separated from the body of the carrier and a pair of spring arms previously held in inactive positions on the body are released and are inserted upwardly through tubular pockets of a tape which is stitched at intervals to a drapery whereby the drapery is conveniently suspended from the track-mounted carrier. Multiple carriers are employed along a length of shower curtain, drapery or other hanging flexible closure.

Abstract: A slideably and rotatably mounted roller member performs a precision take up reel function in the environment of a track mounted, drawable, pleated window covering. The roller member slides along an axis coincident with its axis of rotation as it rotates so that cord being wound therearound attendant its rotation is taken up in the absence of overlapping. One end of the roller member is provided with a centrally bored and threaded plug that screw threadedly engages a fixed position screw member; as the roller member rotates, the engagement of the screw member and the bore drives the plug and hence the roller member in an axial direction. The slideable mount of the roller member is provided in the form of a base member which is slideably received within the roller member housing.

Abstract: There is disclosed a pickup truck cap having a roll-away or sectional overhead door in which the cap has a door frame at the rear thereof with a depending portion adapted to fit in the tailgate receptor portion of the truck bed. The guides for the door comprise channel members of tubular cross-section having a longitudinal side opening facing the door which is provided with opposed, narrow, rolling surfaces and the door is provided with rollers adapted to roll on these rolling surfaces. The rollers have a flange to prevent them from pulling out of the channel and are spring-biased to accommodate rocking of the truck.

Abstract: A slider assembly for an automotive sliding door is more compact than conventional ones. This compact slider assembly can be obtained by overlapping part of one of vertical and horizontal rollers and the plane of the other in order to reduce the distance between the rotational axles thereof. A bracket supporting the rollers is formed with a recess receiving part of one of the rollers. In the preferred structure, the periphery of the recess is essentially concentric to the chosen one of the rollers.

Abstract: A curtain runner suited for use with a curtain box comprising a body containing a top wall, side walls, and a bottom wall, a sleeve fitted in a vertical bore of the bottom wall, and a rod fitted in the center hole of the sleeve. The sleeve is formed with top and bottom flanges which are larger than the vertical bore. The walls form a hollow space or chamber which is longer than the sleeve and has an upper portion which is wider than the lower portion, the width of which is slightly larger than the diameter of the top flange. The rod is formed with at least one knob at the top end thereof and a curtain-joint at the bottom end thereof. The center hole has the top portion smaller than the knob and another portion larger than the knob. The sleeve is formed with a plurality of upper and lower radial splits for expanding the top portion wider than the knob and contracting the bottom flange smaller than the vertical bore.

Abstract: A traverse rod and pulley housing assembly in which the pulley housings are dimensioned for insertion into the rod from the ends thereof and have a lower portion dimensioned to pass downwardly through a rod opening in the lower face wall of the rod. One set of ribs is provided on the pulley housing for laterally and vertically positioning the pulley housing in the inner rod member and a second set of ribs is provided in the pulley housing for laterally and vertically positioning the pulley housing in the outer rod member. Dual slide gates are provided, one on each side of the pulley housing, for controlling movement of the slides along the inner and outer rod members.

Abstract: A multi-directional canted wheel carrier with shiftable control arm for supporting operable wall panels from upper and/or lower supporting tracks, with the control arm engaging a track slot or guideway and supported from the carrier for shifting when necessary between a leading and a trailing relationship to the panel supporting bolt to facilitate multi-directional movement of the carrier through track intersections. The carrier includes a single canted wheel or multiple canted wheels, and the bearings and tilt body structure of the canted wheel assembly provide efficient multi-directional movement of the carrier with minimum force requirements.

Abstract: A curtain rod track fitting and curtain rings for use therewith, the curtain rings being slideable on the curtain rod and being provided with a slide or roll device trued to the middle of the ring and supported on the rod in such a manner that the plane of the ring runs normally substantially perpendicular to the longitudinal axis of the curtain rod, and the rings are reciprocally movable around a horizontal axis running transverse to the curtain rod.

Abstract: A movable curtain partition has bogie-type supports at each end, which move on corresponding guide surfaces of fixed spaced apart tracks.

Abstract: An elongate guide track having at least one elongate ridge portion is fixed to a side wall of a vehicle in such a manner that the ridge portion extends substantially horizontally and projects upwardly. A vertical roller and at least one horizontal roller are rotatably connected to an end of the door through a pivotable bracket member. The vertical roller is formed at its peripheral wall with an annular groove so as to slidably receive therein the elongate ridge portion.