Abstract: A pipe arrangement includes a pipe and a pipe coupling having on a front face a peripheral groove with a groove bottom. The pipe is insertable within the groove and weldable to the pipe coupling. At least one through opening structured and arranged to connect the groove to the surroundings of the pipe coupling.

Abstract: A fitting element, in particular for an HPLC application, is configured for providing a fluidic coupling of a tubing to a fluidic device. The fitting element includes a gripping piece configured to exert, upon coupling of the tubing to the fluidic device, a grip force between the fitting element and the tubing. The gripping piece includes a grip force distributor configured to transform an axial force, provided in an axial direction with respect to the tubing, into a plurality of individual grip force components, each grip force component is exerting on the tubing spaced apart in the axial direction from another grip force component, and the plurality of individual grip force components result in the grip force.

Abstract: A connection device has a male connector and a female connector. The female connector will only accommodate the dedicated male connector, thereby prohibiting a misconnection with the wrong male connector. In certain embodiments, a member prohibits male connectors, other than a dedicated male connector, from being inserted into the female connector. In certain other embodiments, a post prohibits male connectors, other than a dedicated male connector including a slot, from being inserted into the female connector. In still certain other embodiments, a series of prongs in the male connector and corresponding grooves in the female connector ensure the proper connection. Once the male connector is inserted and secured within the female connector, a fluid-tight seal is formed between the male connector and the female connector.

Abstract: An annular sealing material seals a pipe joint between a socket and a spigot. The sealing material includes a bulb part which is composed of a first bulb, a second bulb located closer to the inner side of the socket than the first bulb, and a narrow part present between the first and second bulbs. The first bulb is pressed against the inner circumferential surface of the socket. The second bulb is pressed against the outer peripheral surface of the spigot. The second bulb is inclined towards the pipe center from the first bulb in a natural state before it is provided between the socket and the spigot. The inner diameter of the second bulb is smaller than the outer diameter of the spigot in the natural state. The second bulb is extensible in the pipe diameter direction due to elastic deformation of the narrow part.

Abstract: An improved swage fitted end connector for high pressure large diameter reinforced flexible rubber hose utilizing sine-wave locking of the reinforcement and particularly suited to the petrochemical and drilling industries. Two embodiments of the improved connector for use with wire reinforced thin internal tube hose are disclosed: one with a diameter of 3-inches and for burst pressures up to 20,000 psi and the other for a diameter of 5-inches and for burst pressures up to 18,000 psi. All of the improved connectors will withstand the rated burst pressure of the hose without pumping off or leaking thus any hose that utilizes the improved device will fail before the connector pops off the hose. The improved connectors are designed to meet or exceed the new API temperature ranges and new API flexible specification levels which became effective in October 2006.

Abstract: The invention concerns a medical tubing assembly (100) comprising: finned medical tubing (10) formed from an elongate tubular member (20) disposed with one or more longitudinal fins (21, 21?, 21?), a collar (200), slidably mountable on the finned tubing (10), equipped with a locking means and optionally one or more suture eyelets (250, 250?), said locking means configured to 10 provide a locking force against one or more of the longitudinal fins (21, 21?, 21?). The invention allows securing of a medical tubing in situ that prevents slippage or damage to the tubing wall.

Abstract: A connector assembly for coupling a plasma torch to a receptacle including a connector body configured to receive a mating connector body. The connector body is attachable to a power supply or a plasma arc torch. One or more circumferentially shaped blades extend axially from a surface of the connector body and form a blade ring. One or more gaps can be disposed relative to the surface of the connector body. The plurality of gaps are defined by and between the circumferentially shaped blades. A distance of the gaps between the circumferentially shaped blades extends along a portion of the circumference of the blade ring. The plurality of gaps can be asymmetrically distributed about the blade ring to facilitate proper rotational alignment, and are shaped to align with corresponding circumferentially shaped blades of the mating connector body.

Abstract: A connecting piece for a tubing including a first unit and a second unit is provided. The first unit includes a first connecting element for a tubing element and a second connecting part for the second unit. The second connecting element includes a tubular female part for engagement with the second unit and first sealing elements, and the second unit includes a tubular male part with a collar and second sealing elements for cooperating with the first sealing elements. The first and second units further include separator elements. The first sealing elements and the second sealing elements are configured for mutual locking engagement by moving a male part and a female part axially towards each other.

Abstract: We provide a compressor or vacuum pump fluid intake manifold having a fluid intake and a pair of ports provided by male and female fittings that are slidably engaged to one another. The male fitting has a portion which forms a hollow plug which fits within a respective fluid intake of the compressor housing. The plug portion, or plug, is integrally molded with a longitudinal section of the male fitting member. In similar fashion, the female fitting includes a plug portion which interfaces with a fluid intake in the compressor housing. The plug portion is integrally molded with a longitudinal portion of the female fitting. In one embodiment, each of the plugs includes three extending flanges forming an integral portion of the plug. Two of the three flanges are furtherest away from the plug. These two flanges provide a contact pressure seal with portions of the compressor housing that define the fluid intakes which receive the plugs.

Abstract: A pipe section provided with a socket end part for accommodating a spigot end part of a second pipe section, the spigot end part having a sealing ring and the socket end part configured with an obliquely tapered part having areas of varying dimension for deforming the sealing ring to differing extent along the circumference of the sealing ring when the socket end part engages the spigot end part.

Abstract: A bell end in an extruded pipe having a transition phase of greater than 35° is formed by thermoforming. The transition phase acts as a pipe stop system to prevent over insertion of another pipe into the bell end. The process includes heating the first end of the pipe, pushing the pipe onto a mandrel having a sloped portion with a forming angle of more than 35° and applying pressure to conform the pipe to the shape of the working surface of the mandrel. The heating step includes heating an end of the pipe where the transition phase will be formed in a preliminary pre-heater, while the pipe is still warm from the extrusion process, and then immediately thereafter in a heating box. Preferably, the end of the pipe, and in particular the portion of the pipe corresponding to the longitudinal position where the transition phase will be formed, will be heated to an average temperature of at least 100° F. and more preferably 200° F. and still more preferably at 300° F.

Abstract: The invention relates to a piping apparatus for carrying a cooling or lubricating medium in a transmission or an engine, preferably in a vehicle, with a pipe for carrying a medium and at least one outlet opening for conducting the medium out of the pipe. It is distinguished by virtue of the fact that the piping comprises multiple standardized piping elements (12), that at least one piping element (12) is a piping element having an outlet opening (14), and that the piping elements (12) are made from a plastic. The invention further relates to a modular system for the construction of such a piping apparatus.

Abstract: A twin-wall pipe comprises an internal pipe and an external pipe. The external pipe is corrugated, having elevations and troughs. The twin-wall pipe is further provided with a socket. In a transition portion towards the twin-wall pipe and the socket, provision is made for at least one overflow passage which interconnects the clearance between the external pipe and internal pipe in the vicinity of the transition portion and an adjacent elevation.

Abstract: A coupling for three-wall, corrugated pipe, the pipe including a corrugated wall having a plurality of primary corrugations, is disclosed. The coupling includes a first pipe section having disposed at one end a bell portion, the bell portion having a portion of the corrugated wall and an outer wall; a second pipe section having disposed at one end a spigot portion, the spigot portion having a portion of the corrugated wall between an inner wall and an outer wall; and a gasket engaged between the corrugated wall of the bell portion and the outer wall of the spigot portion. A three-wall, corrugated pipe section, and method for assembling a plurality of three-wall, corrugated pipe sections, are also disclosed.

Abstract: The present invention relates to a device, suitable for use with a beverage dispensing apparatus for dispensing a beverage said device comprises a first opening at one end adapted to cooperate with a control flow faucet having a first dimension, and a second opening at the opposite end of the device adapted to cooperate with a shank having a second dimension to provide a flow path for dispensing a beverage from said shank through said control flow faucet. Also presented is a dispensing apparatus comprising the device disclosed herein.

Abstract: The coupling (1) is for coupling a hose (T) to a mold (M). Its male portion has a male plug (6) for insertion into a female portion (2) of the quick coupling and for being locked therein by balls (11). A locking ring (10) for driving the balls (11) is movable relative to the male plug (6) between a first position in which the balls (11) can be retracted radially inside the locking ring (10), and a second position in which the balls (11) are constrained to project laterally from the locking ring (10). The male plug (6) carries a visual indicator (13) which is at least partially uncovered when said locking ring (10) is in its second position, and that is masked by said locking ring (10) when said locking ring (10) is in its first position.

Abstract: A system and method for quickly refilling a pressurized irritant dispenser is disclosed. In the system and method, either the dispensing nozzle or the connection between the dispensing nozzle and the valve assembly is replaced with a quick connect fitting. The quick connect fitting allows for both the quick refill of irritant and the quick attachment (and detachment) of various accessories to the pressurized irritant dispenser.

Abstract: A method and a device for connecting a plastic line part in a plastic socket. A head end (9) of the line part (6) is heated contactlessly all the way round until the end curls over to a diameter that is greater than the inside diameter of the socket (5). The line part is then pushed into the socket without using a mandrel or insert, so that the head end (9) forms a liquid-tight fused connection of high tensile strength with molten wall material of the socket (5).

Abstract: An assembly including inner and outer overlapping annular elements with interengaging threads. An axial abutment between the two elements is spaced from the threaded section to permit a structural and fluid seal at the joint. Pilot joints are provided to stabilize the joint and provide additional sealing.

Abstract: A pipe joint for joining pipes having a low surface energy and resistance to solvents. The components are an extrudable adhesive; a first pipe having a socket with an inside diameter, where the socket has a mouth, a self-centering bottom, and a cylindrical wall with an inlet, an outlet, and an inner annular channel; a second pipe having an insertion section with an end and an outer annular channel, where the second pipe has an outside diameter that is less than the inside diameter of the socket, the difference in diameters defining a gap and an interlocking keyway; and a flanged annular ring. The annular ring has an inside diameter that enables it to be slid over the second pipe and a thickness that is comparable to the gap. When the adhesive cures it forms a mechanical key. The adhesive is preferably an alkyl borane adhesive.

Abstract: The present application is directed to a keyed coupling assembly and kit for use with a coupling having a pair of connectable coupling members. The keyed coupling assembly includes a keyed member associated with each coupling member to permit the coupling members to mate with each other when the keyed members match, yet prevent the unwanted mating of the coupling members with each other when the keyed members do not match. The keyed coupling assembly is capable of ensuring that a fluid connection can only be made between matching keyed components, thereby ensuring that the characteristics of the fluid (e.g., type of fluid, fluid pressure, and/or fluid direction) delivered from one coupling member to the other is proper.

Abstract: A connecting mechanism for two parts, which are at least partially insertable into one another, presents a cam-operated component, which runs on bearings and which is adjustable between a passive and an active position, on the one part, for shifting a number of contact elements between a withdrawal and a contact position, whereby the contact elements, when in the contact position, mesh in a retaining indentation on the other part, and a driving device for the adjustment of the cam-operated component between the active and passive positions. In order to ensure a secure and stable connection of these parts, using simple design means without additional pre-stressing or restraining devices, even when the parts are only partially inserted into one another, the contact elements are arranged in two or more levels essentially parallel to the insertion direction of the two parts and the cam-operated component for shifting the contact elements between the withdrawal and contact positions is allocated to each level.

Abstract: An auto-adapting fitting for releasably connecting in an end-to-end orientation, a first tube end to a second tube end having an outer diameter within a specified range for use between the ammunition feed port of a paintball marker and the outlet port of a paintball magazine. The fitting is formed onto the end portion of the marker inlet tube. The fitting comprises a resilient sleeve-shaped collar having a number of radially, inwardly extending projections that pass through corresponding radially penetrating holes through the side wall of the end portion of the feed port near its upper opening. The projections bear against the outer surface of the magazine outlet tube. Magazine outlet tubes of a larger outer diameter will cause the collar to be resiliently pushed outwardly.

Abstract: A ventilation chimney or exhaust fan flue section for hog barns has inner and outer plastic tubes formed by edge welding plastic sheets. An snug fitting insulation sheet is slid between the tubes. Collars of male and female coupling elements are inserted into the ends of the section between the inner and outer tubes and secured by screws passing through the outer tube and into the collars. The chimney can be installed by combining sections using a suitable adhesive.

Abstract: A twin-wall pipe comprises an internal pipe and an external pipe. The external pipe is corrugated, having elevations and troughs. The twin-wall pipe is further provided with a socket. In a transition portion towards the twin-wall pipe and the socket, provision is made for at least one overflow passage which interconnects the clearance between the external pipe and internal pipe in the vicinity of the transition portion and an adjacent elevation.

Abstract: An auto-adapting fitting for releasably connecting in an end-to-end orientation, a first tube end to a second tube end having an outer diameter within a specified range for use between the ammunition feed port of a paintball gun and the outlet port of a paintball magazine. The fitting is formed onto the end portion of the gun inlet tube. The fitting comprises a resilient sleeve-shaped collar having a number of radially, inwardly extending projections that pass through corresponding radially penetrating holes through the side wall of the end portion of the feed port near its upper opening. The projections bear against the outer surface of the magazine outlet tube. Magazine outlet tubes of a larger outer diameter will cause the collar to be resiliently pushed outwardly.

Abstract: A connection device for fitting to a member, particularly to a corrugated flexible pipe (146, 246, 446) formed with a series of spaced annular grooves, the device comprising first and second tubular bodies (10, 11) coupled together, in use, with the pipe received in an open end of the first body (10). The first body has a plurality of resilient lugs (14) with respective inwardly directed projections (17) at the ends thereof to be received in one of the said grooves to grip the pipe. The two bodies can be relatively angularly moved between a neutral position of the device, where the pipe is retained by the resilience alone of the lugs, an unlocked position, where the lugs are released from the pipe, and a locked position, where the lugs are forced into locking engagement with the pipe, movement of the lugs being controlled by cam formations (29) extending from the end surface of the second body (11).

Abstract: A plastic coupling for joining two metal pipe sections end-to-end to form a pipe assembly. A first plastic spigot cuff is formed along the periphery of the end of the first pipe and a mating second plastic bell cuff is formed along the periphery of the end of the second pipe, such that the first and second cuffs form a bell and spigot joint with the first, spigot cuff inserted into and joined to the second, bell cuff.

Abstract: A system for sealing one end of a first air duct with an adjacent overlapping end of a second air duct incorporates multiple sealing components. One of the sealing components interacts and activates another of the sealing components. One of the sealing components mechanically compressively elastically deforms another of the sealing components.

Abstract: A first tube has an end portion with a socket that is tapered by, a frustoconical wall that ends with a radially extending land. A copper brazing ring is disposed on the land. An end portion of a second tube having a knurled surface is press fitted into the socket to provide a coupling assembly. Upon heating the coupling assembly, the copper brazing ring melts and flows through the grooves in the knurled surface to weld the second tube to first tube and to seal the interface therebetween.

Abstract: A plastic pipe provided with a socket and a method of providing a plastic pipe with a socket, whereby the socket comprises at least two layers. The orientation of at least one socket layer is different from the orientation of another layer and the orientation of at least one layer is different from the orientation of a body portion of the plastic pipe. The socket is made for instance from a plastic pipe comprising at least two layers. The orientation temperatures of at least two different layers are different. The plastic pipe is heated to a temperature at which the material of at least one layer is oriented during expansion and the material of at least one layer is substantially not oriented during expansion. The end of the plastic pipe is expanded at said temperature so as to provide it with a socket.

Abstract: A fitting for connecting two components is described. The fitting may be explosion proof for use in hazardous environments. The fitting may swivel allowing fast and easy connection to fixed components, thus minimizing the time required for installation and periodic maintenance, while maintaining the integrity of the explosion proof fitting. In this way, components—such as electrical conduits containing conductors or wires—can be installed and maintained without the use of damming material. Also described is a method of installing an explosion proof fitting for use in hazardous environments.

Abstract: A plastic pipe provided with a socket and a method of providing a plastic pipe with a socket, whereby the socket comprises at least two layers. The orientation of at least one socket layer is different from the orientation of another layer and the orientation of at least one layer is different from the orientation of a body portion of the plastic pipe. The socket is made for instance from a plastic pipe comprising at least two layers. The orientation temperatures of at least two different layers are different. The plastic pipe is heated to a temperature at which the material of at least one layer is oriented during expansion and the material of at least one layer is substantially not oriented during expansion. The end of the plastic pipe is expanded at said temperature so as to provide it with a socket.

Abstract: A plastic pipe has a multiple layer wall construction including major and minor wall portions. The major wall portions are formed with first corrugations and are separated from one another by the minor wall portions which are formed with second corrugations and a bowed wall part which is of the same diameter as the first corrugations. The second corrugations are smaller in diameter than both the first corrugations and the bowed wall pipe. The wall construction is cut at the bowed wall part to produce two pipe sections which couple with one another. One of those pipe sections has an open ended bell converted from the bowed wall pipe and the other pipe section has a male spigot formed by the second corrugations of the wall construction.

Abstract: Pipe coupling system and method in which a tapered wall is formed on one of two tubular pipe members for press-fit engagement with a wall of the second pipe member, and the two pipe members are pressed together in an axial direction to bring the tapered wall and the other wall into direct press-fit engagement with each other. The two pipe members can, for example, be a length of copper water pipe and a copper pipe fitting, and in certain disclosed embodiments, the pipe members are drawn together by a tool having axially movable jaws which engage the pipe members and are driven together in the axial direction by an actuator and linkage which move in a perpendicular direction.

Abstract: A first pipe is press-fitted into a second pipe having an inner peripheral surface, circular in section, about an axis of the second pipe. The first pipe, having an outer peripheral surface provided with recesses each located between arcuate portions, and which recesses have the same radius about an axis of the first pipe and are located at a plurality of circumferentially spaced-apart points, The recesses are each located radially inwardly of a phantom circumferential extension of the arcuate portions to extend axially over a predetermined length of the first pipe.

Abstract: The step of soldering, brazing, or welding a tube joint may be eliminated in a tube joint construction that includes a male tube member (10) having a first cylindrical section (14) of relatively lesser diameter and an adjacent, second cylindrical section (18) of relatively larger diameter. Also included is a female joint element (12) having an internal passage (30) which includes an emerging cylindrical section (32) of a diameter just less than the relatively larger diameter and an adjacent, interior cylindrical section (34) of a diameter just less than the relatively lesser diameter. The male tube member (10) is interference fitted into the female joint element (12) to provide a sealed joint without the need for soldering, brazing, or welding. A back-up seal in the form of an adhesive bead (38) may be disposed at the tapered end (28) of the female joint element (12) if desired.

Abstract: A sealing device for sealing two concrete pipe end portions in relation to each other comprises a sealing surface (4) in a socket (2) of one of the pipe end portions and a sealing surface (14) on a spigot end (12) of the other pipe end portion. The spigot end is introduced into the socket and there is between the sealing surfaces formed a sealing space in which an elastic material sealing element (26) is positioned in a compressed state. A closure device (28) is positioned in the sealing space between the interior of the pipe end portions and the sealing element (26) for preventing a medium conveyed in the pipe end portions from contacting the sealing element as well as the sealing surfaces at least in a region of the sealing element.

Abstract: The step of soldering, brazing, or welding a tube joint may be eliminated in a tube joint construction that includes a male tube member (10) having a first cylindrical section (14) of relatively lesser diameter and an adjacent, second cylindrical section (18) of relatively larger diameter. Also included is a female joint element (12) having an internal passage (30) which includes an emerging cylindrical section (32) of a diameter just less than the relatively larger diameter and an adjacent, interior cylindrical section (34) of a diameter just less than the relatively lesser diameter. The male tube member (10) is interference fitted into the female joint element (12) to provide a sealed joint without the need for soldering, brazing, or welding.

Abstract: A cross-fire tube for use in connecting adjacent combustors in industrial gas turbines includes a relatively flexible main spring body portion (12,50, 68, 76) extending between two end portions, each end portion including a connector (22, 26, 54, 72, 90) adapted to engage a collar portion of one of the respective combustors. Each of the connectors includes a plurality of spring loaded fingers adapted to engage at least an inside surface of a respective collar portion. When secured in place between adjacent combustor liner covers, the cross-fire tube is in axial compression. The main spring body may comprise a saw cut spring tube (12), a coil spring (52) covered by a wire reinforced ceramic fabric (66), a corrugated wire mesh fabric (70) heat treated to impart spring characteristics thereto; or a bellows type tube (76).

Abstract: The invention relates to an insert for connecting a flexible tube to a shower head which has an axial pipe (13) and, externally, has keying (17) and sealed truing (15, 16) structure in a seat of said shower head. It has one elastic tab (19) with a tooth (20) able to clip into a hole (21') formed at the same level of said seat. The keying structure (17) prevents the rotation of the insert while the tooth prevents an axial unscrewing.

Abstract: A pipe which is configured for coupling to another conduit such as a following pipe has an end portion of reduced outer diameter and a transition portion which is connected to the body of the pipe. The end portion can be inserted into the following pipe. At least one abutment is provided at the transition portion to provide a contact face for receiving the end face of the following pipe.

Abstract: Coupling device and method for joining together tubular elements such as sections of aluminum tubing. The device comprises a coupling sleeve having conically tapered walls of diameters corresponding to the diameters of the tubular elements to be joined together. The tubular elements and the sleeve are pressed together to form a rigid structure in which the tubular elements are aligned axially of each other and the walls of the cooupling sleeve are in tight frictional engagement with the walls of the tubular elements.

Abstract: A locking mechanism for assembled threaded coponents, including a circumferential tongue on one of the components and a corresponding notch on the other component. As a locking position is approached, the tongue is biased out of its normal position by a camming surface adjacent to the notch, and is then released into the notch as the locking position is reached. Unlocking only requires the tongue to be moved out of the notch momentarily during rotation from the locking position.

Abstract: A method for replacing a damaged or defective section of a length of original piping or tubing located within a structrue such as the turbine of a jet engine wherein access to the tubing is limited, and replacing such damaged section with a new section of tubing comprises inserting a cutter mounted at one end of a flexible shaft into the interior of the original tubing and rotating the shaft to cut out and remove the damaged section of tubing leaving at least one stub section of original tubing. The stub sections of original tubing are then prepared for welding or brazing to a section of replacement tubing with a series of tools each mounted to an elongated shaft. These tools include a chamfering tool, a deburring tool, and a polishing tool.

Abstract: Coupling device and method for joining together tubular elements such as sections of aluminum tubing. The device comprises a coupling sleeve having conically tapered walls of diameters corresponding to the diameters of the tubular elements to be joined together. The tubular elements and the sleeve are pressed together to form a rigid structure in which the tubular elements are aligned axially of each other and the walls of the coupling sleeve are in tight frictional engagement with the walls of the tubular elements.

Abstract: An opto-mechanical coupler is described for providing a quick-release mechanical and optical connection between a camera and the eyepiece of an endoscope or other optical instrument. The coupler comprises a hollow body member that is adapted to be screwed into the threaded aperture of a camera and is characterized by a center bore for transmitting images from the endoscope to the camera, and eyepiece clamping means attached to the hollow body member.In one embodiment, the eyepiece clamping means comprises a single clamping member defining a channel for receiving the eyepiece, and means rotatably connecting the clamping means to the hollow body so that rotation of the clamping member in one direction will cause the eyepiece to be clamped to the hollow body and rotation in a second opposite direction will unclamp the eyepiece from the hollow body.

Abstract: Mechanical pipe joints and methods of forming same, wherein pipe ends are first prestrained into expanded bell and expanded pin shapes and then again strained by interference joining, both prestraining and subsequent straining being under controlled conditions which take maximum advantage of the metallurgical and physical properties of the materials to provide improved connection strength produced through approaching the ultimate strength of the material. Strain aging prior to joining may be used to further enhance connection strength to a point which requires exceeding the ultimate strength of the parent material.

Abstract: There is provided a tube end configuration for joining two hollow tubes end to end, the novel joint comprising a tapered end on one tube, which end fits into the untapered end of another tube forming a variable length tubular pipe. The untapered tube end has one or more protrusions (ridges) extending inwardly from its inner wall while the tapered end has one or more complementing indentations (recesses) extending inwardly from its outer wall. The ridges engage the recesses when the tubes are joined together. One or both of the tubes also have several longitudinally aligned slots located within the tube ends that overlap whereby spring leaves are defined which can flex resiliently to allow the ridge(s) to ride over the taper and fixedly lodge in the recess(es) as the tubes are slid together.

Abstract: A tubular assembly embodying a pin and slot connection between two thin wall tubular members having end portions disposed in telescopic relation with respect to one another. The outer tubular member having the slot also has an opening extending therethrough in closely spaced relation to its edge in a position generally alongside the slot providing an axially elongated wall portion between the opening and slot. The wall portion has a fixed integral outer end spaced axially outwardly of an intermediate locking section of the slot and a fixed integral inner end spaced axially inwardly of the intermediate locking section of the slot and is operable to resiliently deflect laterally when the pin is moved axially inwardly through the slot to thereby permit the locking section of the slot to expand in its width dimension and permit yielding passage of the pin axially thereby into received relation within the inner section of the slot.