Abstract: A metal gasket is formed by first and second metal base plates laminated together. The first metal base plate includes one first half bead around the hole, and a first outer sub-bead section. The first outer sub-bead section is smaller than the first half bead, and is provided outside the first half bead. The second metal base plate includes one second half bead around the hole to project in a direction opposite to the first half bead, and a second outer sub-bead section smaller than the second half bead and provided outside the second half bead. The second outer sub-bead section projects in a direction opposite to the second half bead. When the first and second metal base plates are assembled, the first and second half beads face opposite to each other, and the second outer sub-bead section abuts against the first outer sub-bead section.

Abstract: In a sealing device (1) installed in an installation groove (4) provided in one member (2) of two members (2, 3) facing to each other so as to be brought into close contact with the other (3), the sealing device has a seal ring (11) and a backup ring (21) arranged in a low-pressure side (L) of the seal ring (11), the installation groove (4) has a slope bottom surface (4c), the backup ring (21) has a slope surface (21a). The sealing device (1) is to be made such that the seal ring (11) made of a rubber-like elastic body is prevented from being damaged by the backup ring (21) made of a hard material. In order to achieve this object, a second backup ring (31) is arranged between the seal ring (11) and the backup ring (21), and formed by a softer material than the backup ring (21).

Abstract: Arrangement for holding a tool fitting has a spindle with a forward directed surface and a bore which intersects the forward directed surface and which, starting from such surface, extends rearwardly in order to receive a shaft of the tool fitting. A device for locking the tool fitting with the spindle has an inner and an outer locking element which engage on another. The locking elements act in the manner of a bayonet coupling, wherein a projecting element is disposed in a blind stop groove extending first axially and subsequently radially in a circumferential surface starting from an end face.

Abstract: A suspension device (1) for suspending a wheel (2) with respect to the body (8) of a vehicle. The device allows a substantially vertical suspension movement and allows the wheel carrier (3) to move in terms of camber with respect to the body of the vehicle. The device comprises a slide (5) and a lower arm. The slide comprises an upper part (52) and a lower part (51) which can move one with respect to the other, the upper part being connected to the body and the lower part being connected to the wheel carrier. The device further comprises a rocker (4) articulated in the camber plane, on the one hand, to the lower arm and, on the other hand, via a link (7) to the wheel carrier, the rocker further being articulated in the camber plane to the lower part of the slide.

Abstract: A goalie skate having a skate boot comprising a thermoformed outer shell with a sole and an ankle portion for receiving the ankle of the foot, the ankle portion comprising medial and lateral sides for facing the medial and lateral malleoli respectively, the medial side comprising an upper edge that is a first distance away from the sole and the lateral side comprising an upper edge that is a second distance away from the sole, the first distance being greater than the second distance. By having a goalie skate boot that has the lateral upper edge located below the medial upper edge, the lateral outward flexion of the foot is eased when the goalie skate is in an angled position. The invention also relates to a goalie skate with a skate boot comprising an outer shell that is thermoformed such that it comprises an integrated toe portion, thereby eliminating the traditional toe cap.

Abstract: A method of assembling shopping carts includes providing a basket defining including rear upright frame members. Each rear upright frame member defines includes a lower connecting portion. The method further includes providing a first base and providing a second base. The first base includes a pair of first base supports each configured to be removably secured to one of the lower connecting portions. The second base includes a pair of second base supports each configured to be removably secured to one of lower connecting portions, and the second base is shaped differently than the first base. The method includes selecting one of the first base and the second base having a desired base size and shape, and removably securing the basket to the selected one of the first base and the second base including coupling each lower connecting portion with one of the first base supports and second base supports.

Abstract: A foldable vehicle frame includes a first main body, a second main body having a pedal portion and at least one joint portion, and a connecting mechanism connected to the first main body and the second main body. The connecting mechanism further includes a pair of rod parts, and the pair of rod parts respectively has a head end and a tail end. The head end is rotatably connected to the first main body, and the tail end is rotatably connected to the second main body, such that the connecting mechanism is turned over and stacked at a lower layer of the first main body, and the pedal portion of the second main body is folded under the turned-over connecting mechanism, so as to form a folded state. Furthermore, the connecting mechanism, the first main body, and the second main body are all unfolded simultaneously to form an unfolded state.

Abstract: An inter-convertible single person type transporting aid (10) comprises a multi directionally propellable wheeled carrier frame (12) that is fitted with drive wheels (14) that are independently drivable via motors (16) and situated to enable aid central axis turning. The frame (12) is constituted from an upper frame part (20) displaceably mounted to a wheeled base frame (22) fitted at its outer corners with castors (24). The upper frame part (20) is biased in the direction of arrow (30) relative to the base frame (22). The aid (10) is re-arrangeable into a walk supporter or walker (38), a sitting transporter and a standing transporter by the removable fitting of a seat and a standing platform respectively.

Abstract: A steering mechanism for a model vehicle is provided, having one or more steering actuators, a steering control arm pivotally mounted for rotation relative to a model vehicle chassis, the steering control arm being coupled directly to at least two tie rods, each tie rod controlling the steering of at least one wheel of a vehicle, and each of the one or more steering actuators coupled to the steering control arm to rotate the control arm relative to the vehicle chassis.

Abstract: A ball joint integrated knuckle and an assembling method thereof is provided. The ball joint integrated knuckle includes: a knuckle integrating a housing formed with a first screw thread on its one side surface; and a ball joint having a thread seat formed with a second screw thread, wherein the ball joint is integrated into the knuckle by combining the first screw thread of the housing of the knuckle with the second screw thread of the thread seat of the ball joint. Thus, it is possible to easily attach/detach the ball joint with respect to the knuckle by combining/removing the ball joint using the first screw thread, formed in an inner circumferential surface of the housing integrally formed with the knuckle, and the second screw thread formed in an external circumferential surface of the thread seat. Also, according to the present invention, the ball joint is not manufactured as a finished product, but provided as kit.

Abstract: A boot for covering a steering knuckle of an amphibious vehicle comprising a flexible tube having a first end and a second end, wherein the first end comprises a molded groove for seating a first clamp, and wherein the second end comprises a straight cuff for clamping with a second clamp onto a flange of the steering mechanism of the amphibious vehicle.

Abstract: A suspension system of the present invention pivotally supports a wheel of a motor vehicle. An upper control arm and a lower control arm are cooperable with a spindle, which supports the wheel. A vibration damper is cooperable with the upper control arm. A link interconnects the lower control arm and one of the terminal ends of the vibration damper thereby defining a common axis bisecting the link. The vibration damper moves along the common axis to absorb vibration transferred from a road surface and through the wheel.

Abstract: To control a camber angle to an adequate value by the use of a lateral force acting on a wheel, without causing a displacement of a tire ground contact point. A suspension device includes a link mechanism replaceable by a first virtual link 11 which, when a lateral force acts at a tire ground contact point, inclines a wheel in a camber angle direction with respect to a vehicle body so as to increase the lateral force, and a second virtual link 12 which is connected virtually and rotatably between the first virtual link 11 and the vehicle body 1 and which is arranged to allow the wheel 2 to move in the up-and-down direction with respect to the vehicle body 1 in accordance with a load variation of the wheel in the up-and-down direction.

Abstract: The present invention provides a scooter with driving mechanism comprising a scooter assembly and at least a driving mechanism, wherein the scooter assembly has a treadle and a rear wheel; the driving mechanism comprises a reset device and a transmission device, which has an irreversible transmission unit and a passively driven gear, wherein the passively driven gear is driven by the driving gear in meshed manner to drive the irreversible transmission unit in relay way, the irreversible transmission unit, which is connected to the rear wheel, is served to drive the rear wheel to rotate in single direction. Thus, by means of the treading and releasing actions with the treadle, the scooter can be driven smoothly with benefits in not only the risk of tumbling down accident being avoided but also the effects in energy-saving and environmental protection being achieved.

Abstract: A steering shaft (2) penetrates a head tube (1) fixed to a vehicle body (A) of a motorcycle. The steering shaft (2) is coupled to a front wheel and handlebars of the motorcycle. A linear damper of a double-rod type is enclosed in the steering shaft (2). When the steering shaft (2) rotates with respect to the vehicle body (A), a feed screw (12) engaged with a screw portion (11) on the outer circumference of one of the piston rods (6a, 6b) causes the linear damper to operate. By enclosing the linear damper in the steering shaft (2), a space for disposing the steering damping device can be minimized. The feed screw (12) converts a rotational displacement of the steering shaft (2) into an axial displacement of the piston rods (6a, 6b) such that a bending load does not act on the piston rods (6a, 6b).

Abstract: Device includes plates which are connected by an axle that extends through a guiding piece and a ball joint element positioned at the ends of a column tube. Rotating elements are disposed in the plates and enable same to rotate around the axle which is blocked in rotation by the guiding piece. The guiding piece has a concave spherical surface coupled to the convex surface of the eccentric which is equipped with a bore that is off-centre in relation to the vertical axis of the spherical surfaces and a flat surface which is perpendicular to the axis of the bore. An eccentric pivots in the bore and on the surface via a cylinder and a surface. The eccentric is equipped with a bore that is off-centre in relation to the cylinder. The combined reverse rotation of the eccentrics enables the assembly to pivot around the axis.

Abstract: A method of manufacturing a lightweight vehicle frame, and the end product frame, are disclosed. A first tube, which can be a cured hollow reinforced resin composite tube, is connected to a second part by a tab. The tab is tapered and is affixed to the first tube. The tab is bonded to the second part by an epoxy. The taper of the tab allows the angle at which the parts are connected to be controlled through a wide range.

Abstract: A rear frame support structure mounts a bicycle wheel for rotation about an axis during bicycle motion, and has a pair of arms spaced axially apart of each other and axially offset from a same axial side of the wheel to enable axial movement of the wheel relative to the arms when the bicycle is not in motion. A drive mechanism is supported by both arms, for enabling the wheel to be driven during bicycle motion. The drive mechanism remains supported by both arms during the axial movement of the wheel.

Abstract: A removable foot support device for a motorcycle passenger generally comprises an elongate member having a first end portion and a second end portion. The first end portion is removably mounted to a first portion of a motorcycle. A support member coupled to the second end portion of the elongate member includes a footrest surface for supporting the passenger's foot.

Abstract: A main stand for a vehicle (e.g., a motorcycle) includes a bar-like member rotatably disposed on a vehicle body frame of the motorcycle, a lever rotatably disposed on the vehicle body frame, a cam rotated integrally with the lever, and a cam rest disposed on an upper portion of the bar-like member. The cam rest is pressed by the cam as the lever is rotated to bring the bar-like member to an upright position to raise a wheel off a ground. The lever is rotated by an occupant of the vehicle.

Abstract: A bicycle having a wheel and a frame supported by the wheel. The frame includes a wheel support and a stay extending from the wheel support. A stay protector resiliently engages the stay. In one embodiment, the stay includes a tubular-shaped member having an exterior surface, and the stay protector is contoured to substantially match the exterior surface.

Abstract: The invention relates to a nacelle that is releasably attachable, the nacelle being adapted for suspension of the nacelle between at least two wheel sets as completely or partly self-supporting suspension.

Abstract: A tractor/trailer combination wherein a trailer is connected to a tractor through the connection of a kingpin with a fifth wheel is provided with a trailer steering system. Using given dimensions of the tractor/trailer combination and a measured articulation angle between the tractor and trailer during a turn, the wheels of the rear axles of the trailer are turned so that they turn approximately about the instant center established for the tractor. In this way, the trailer turns around approximately the same point as does the tractor, thus significantly eliminating off tracking.

Abstract: Disclosed is a plug-in coupling system for joining cables between a tractor and a trailer. The invention also relates to the individual components, i.e. the semitrailer coupling and the plug-in connector on which the invention is implemented. The cables between the tractor and the trailer are usually plugged into each other by hand. Automatic systems have not been successful on the market so far. The aim of the invention is therefore to create a plug-in coupling system which allows the supply cables to be connected in a comfortable and operationally safe manner when the trailer is joined to and disconnected from the tractor. Said aim is achieved, among other things, by disposing the socket in a stationary manner below the insertion hole on the semitrailer coupling while arranging the contact points of the plug below the king pin on the plug-in connector.

Abstract: The present invention is a configurable trailer hitch that provides an extended towing position for transferring a tractor force to a load, and a retracted storage position for safely stowing the hitch under a towing vehicle. The trailer hitch has a spring loaded retaining pin which engages a hitch receiver when the trailer hitch is placed in the towing position, and a storage latch adapted to hold the hitch receiver when the trailer hitch is placed in the storage position.

Abstract: An integrated support structure apparatus is provided for attaching either a fifth wheel trailer hitch or a gooseneck trailer hitch to a truck bed. The integrated support structure comprises an H-shaped body that is attached to at least one truck frame rail below the truck bed. A gooseneck ball receiver is attached to a central portion of the body and aligned with a gooseneck opening in the truck bed. A plurality of mounting pads are formed integrally as part of a plurality of end inserts that are assembled to the body.

Abstract: Skis and methods of skiing are provided. In some implementations, the skis include a preload, and/or have a relatively low spring rate. In one aspect, the skis include (a) a ski body having a front and a back, the front and back terminating, respectively, at a tip and tail at opposite ends of the ski body; and (b) a suspension system connected to the ski body so as to apply a load to the front and back of the ski body. In some cases, the suspension system is configured to provide the ski with a spring rate that diminishes as the ski is flexed from a normal unloaded state or a predetermined state of deflection to a state of greater deflection.

Abstract: A convertible suitcase stroller apparatus may comprise a suitcase that is openable at at least one side; a handle assembly that is reconfigurable between a storage configuration and a deployed configuration and that has a handgrip portion and two handle stems, wherein each of the two handle stems has an upper end and wherein the handgrip portion is established substantially between the upper ends; fabric seatback material that is established substantially between the two handle stems when the handle assembly is in the deployed configuration; a child seatbelt that is securable around a child seated directly on the suitcase; and at least two wheels established substantially at a lower portion of the suitcase, wherein a back of a child seated directly on the suitcase is supported against the fabric seatback material, the fabric seatback material is crumpable, and the convertible suitcase stroller apparatus is convertible between: a minimum space occupying configuration, a suitcase only toting configuration and a

Abstract: In a strut type shock absorber (1), a lower cap (2) is welded onto an inner circumferential surface of an outer shell (3) at a step (16) formed in a retreated position from an axial tip of the outer shell (3). The axial tip of the outer shell (3) is welded onto the inner circumferential surface of a knuckle bracket (6) which holds the outer shell (3). Since welding of the lower cap (2) onto the outer shell (3) and welding of the knuckle bracket (6) onto the outer shell (3) are conducted at different positions, the lower cap (2) is welded onto the outer shell (3) without suffering from blowholes irrespective of the material forming the knuckle bracket (6), and as a result, a weld bead (17) having a high degree of air-tightness is formed.

Abstract: A vehicular interior trim piece with a tether for use with a side curtain airbag. The tether is attached to an integral first panel portion and a second panel portion which rotates about a hinge out of the path of the airbag. The tether prevents complete detachment of the second panel from the first panel.

Abstract: A side airbag apparatus for vehicle has an airbag and an inflator. An upper chamber, a lower chamber, and an intermediate chamber are defined by a seam in the airbag. When the airbag is deployed, the upper chamber corresponds to a shoulder of an occupant, the lower chamber corresponds to a lumbar region of the occupant, and the intermediate chamber corresponds to a thorax of the occupant. The seam guides gas from the inflator to the upper and lower chambers such that the upper and lower chambers are substantially simultaneously inflated, and the intermediate chamber is inflated after a delay. The thickness of the intermediate chamber is less than the thicknesses of the upper and lower chambers. As a result, the occupant of the vehicle is effectively protected.

Abstract: The present invention relates to a gas generator for a restraining apparatus of a vehicle including: a housing having a gas discharge port; a gas source; and an ignition device accommodated inside the housing, the ignition device being connected to an outer power source through an opening of the housing, the ignition device including a igniter body which has a conductive pin and is fixed by crimping an igniter collar, the igniter collar having a plug-accommodating chamber for inserting a plug to be connected with the conductive pin, at least part of a wall surface of the plug-accommodating chamber being formed by a holder which is an independent member formed of a non-electroconductive material and is disposed inside the igniter collar, the holder being fixed in a state of contact with the igniter collar and a housing wall surface including a circumferential edge of the opening.

Abstract: A passenger-seat airbag (32) includes a pair of left and right airbags (44, 46), and a root portion (48) that is connected to both of the left and right airbags (44, 46). When the passenger-seat airbag (32) is provided in a vehicle, an airbag folded portion (62) that forms the left and right airbags (44, 46) is positioned closer to the rear of the vehicle than the root portion (48) is, and a slack portion (49) that forms the root portion (48) is made upright along the airbag folded portion (62), and is positioned closer to the front of the vehicle than the airbag folded portion (62) is. Thus, the slack portion (49) is expanded and deployed toward a windshield earlier to form “a wall”. Then, the left and right airbags (44, 46) are stably deployed toward a passenger seat (toward the rear of the vehicle).

Abstract: An airbag is provided with first and second tethers and attached to the inner surface of the ceiling. The first tether extends towards the left side of the back face side from the center portion of the front face side facing a rider. The second tether extends towards the right side of the back face side from the center portion of the front face side. The first and second tethers are arranged into a substantially V-shape with the bottom on the rider's side. When the airbag is compressed in the back and forth direction by receiving a forward momentum of the rider, the expansion of the airbag is regulated by the first and second tethers on the front face side. The expansion in the right and left direction is not regulated by the first and second tethers on the back face side of the airbag. Accordingly, the airbag expands in the right and left direction on the back face side so as to have a wide width.

Abstract: A side airbag apparatus includes an inflator and an airbag. Gas discharged from the inflator inflates and deploys the airbag in a space between a vehicle door and an occupant seated on a front seat in a passenger compartment. The airbag has a tether that limits the thickness of the airbag when the airbag is inflated and deployed. The airbag has a pair of inner surfaces that face each other along the direction of the thickness. The tether bridges the inner surfaces of the airbag. A vehicle exterior joint portion, which couples the tether to the inner surface of the airbag located close to an inner surface of the body side portion, is located closer to a center of the airbag than a vehicle interior joint portion, which couples the tether to the inner surface of the airbag located far from the inner surface of the body side portion.

Abstract: An example airbag arrangement includes an airbag that moves between an expansion-constrained position and an expanded position. A tether adjacent an exterior surface of the airbag moves with the airbag between a shorter position and a longer position. The tether remains intact in the shorter position and the longer position. When the tether is in the shorter position, the tether holds the airbag in the expansion-constrained position.

Abstract: An operator backrest in combination with a materials handling vehicle is provided. The backrest may comprise a primary support pad and gripping structure located in at least one side portion of the primary support pad. The gripping structure may be substantially even with or extend above a surface of a portion of the primary support pad surrounding the gripping structure for engagement with an operator positioned on the materials handling vehicle.

Abstract: A retractable steering mechanism includes a steering wheel, a steering column connected to the steering wheel, a telescopic device connected to steering column, a connector for connecting the telescopic device to two front wheels of the vehicle. A first cover is connected to the vehicle. A second cover is connected to the first cover and includes at least two slots defined therein. A shell is used to house the steering column so that the steering column is rotational but not movable in the shell. The shell includes at two bosses formed thereon and movably disposed in the slots. A moving unit is provided between the vehicle and the shell and operable, in a car accident, to retract and tilt the shell due to the bosses moving in the slots.

Abstract: A main beam of a container semi-trailer provided with the joint, and the connecting method thereof. The joint is used to connect a main beam and has a first connecting plate connected to the main beam; a second and a third connecting plate secured to the same side of the first connecting plate and spaced apart to each other; and a fourth connecting plate slantingly connected between the second and third connecting plates.

Abstract: A device for tightening a seat belt has a piston (2) drivable linearly in a piston guide (1) by the gas pressure of a propellant gas. A gearing (3) is also caused to move by the piston (2), the gearing serving the transmission of the piston movement to a pinion (4). The pinion (4) is connected to, or configured to be connected to, a belt spool of a seat belt retractor (13) in a manner whereby rotation of the pinion causes rotation of the belt spool. The gearing (3) on associated with the piston (2) is mounted displaceable transversely to the piston's direction of movement and meshes with the pinion (4) as a result of gas pressure in an expandable bladder (24).

Abstract: A seat belt retractor including an integral electronic control unit (ECU). The ECU is detachably installed between lower edges of respective both side walls of a frame. Further, a motor is detachably fixed to a lower surface of a case of the ECU. Since the ECU is disposed between the frame and the motor, the ECU can be protected from an external force by means of the frame and the motor.

Abstract: A seatbelt retractor integrated with an electronic control unit. A motor is disposed above both side walls of a frame and on the same side as a spool with respect to a back board. The motor is detachably fixed to at least one of the back board and the both side walls and of the frame. The ECU is detachably mounted to an upper stay extending upward from the back board of the frame and to be mounted to the vehicle body. In this manner, the motor and the ECU are integrated with a seatbelt retractor. Since the ECU is mounted to the upper stay, the weight of the ECU is dispersed not only to the main body of the seatbelt retractor but also to the upper stay. Thus, the vibration of the seatbelt retractor may be reduced.

Abstract: The power-operated mud flap device may include a mud flap adapted to be positioned adjacent to an outer face of the existing vehicle tire. The device may also include a mechanism for automatically displacing the mud flap between a raised and a lowered position defined along a vertical plane. The automatic displacing mechanism may further include a drive shaft coupled to a power actuated motor. First and second linear adjustable driven shafts may be mated to the drive shaft. The driven shafts are preferably registered perpendicular to the drive shaft. Additionally, each driven shaft may include a threaded male member and a female member containing an axial bore. The male member may be rotatably inserted into and extracted from the female member in such a way that the longitudinal length of the driven shaft decreases and increases respectively, thus displacing the mud flap into a raised or lowered position respectively.

Abstract: An improved structure for book cover includes a cover layer, a left positioning plate and a right positioning plate, wherein the left and the right positioning plates are disposed above the cover layer and the edges of the cover layer can be folded inwardly for being adhered or stitched at the edges of the left and the right positioning plates, and the left and the right positioning plates respectively have a protruded left binding portion and a protruded right binding portion which both have plural holes corresponding to each other for fixing loose leaf papers between the left and the right positioning plates directly by a spiral so as to form a book. Through the improved structure of book cover in the present invention, the manufacturing process can be simplified and the cost of labor and material can be saved.

Abstract: A magnetic coupling assembly for use in coupling portions of a gas delivery system. The magnetic coupling assembly includes a first member and a second member to be coupled together. The attractive forces between the first plurality of magnetic elements on the first member and a second plurality of magnetic elements on the second member join these members. The poles of magnetic elements in the first and second plurality of magnetic elements is opposite that of an adjacent magnetic element. The first and second members are easily detached from one another simply by rotating the first member relative to the second member such that the magnetic poles of the magnetic elements in each plurality of magnetic elements become unaligned, causing an weakening of the attractive forces.

Abstract: A coupling device for electrical wire-carrying conduits for assembly with an overhead support member having a stem with a free threaded end. The coupling device includes an integral tubular member having axially opposed ends, each of which receives an end of a mating conduit, and the integral top surface on the tubular member has an aperture for engagement with the free end of the stem of the supporting member.

Abstract: A self-locking threaded connection including an externally threaded male part having a hollow center and a series of cooperating members; and an internally threaded female part having a series of cooperating members; the cooperating members consisting of projections and detents. As the parts are threaded together, the reception of the projections into the detents produces both audio and tactile responses indicating that the connection is made and near a destructive over tightening.

Abstract: A fluid connection comprised of a first fitting having a body with a first end and a second end. A passage extends through the body from the first end to the second end. A bracket is mounted to the second end of the body. The bracket defines a space adjacent the second end. A mounting element is provided for mounting the first end of the body to a fluid inlet line. A piston is movable within the passage. The piston has an outer surface, an inlet side facing the first end of the body and an outlet side facing the second end of the body. An aperture through the piston fluidly connects the inlet side of the piston to the outlet side of the piston. A second fitting, having a fluid opening therethrough, is dimensioned to be slidably received within the space adjacent the second end of the fitting. The piston is movable into engagement with the second fitting with the aperture in the piston communicating with the fluid opening in the second fitting.

Abstract: A pipe connector (10) including a joining portion (12) having a port (14) for connection of a first pipe thereto, the joining portion also having a wall for connection of a second pipe thereto, the second pipe being able to be connected to the wall by boring a hole through the wall and bonding the second pipe thereto, the wall having a shape such that the pipe may be bonded to the wall at a plurality of angles with respect to the port, whereby, in use, the pipe connector (10) can connect the first pipe to the second pipe at a plurality of angles with respect to each other.

Abstract: A cylindrical junction part for joining together two elements of an assembly of at least two coaxial pipes, comprising an outer pipe containing an inner pipe defining an annular space preferably containing lagging material. The forged junction part forms two annular cavities defined by branches in a fork configuration at each end of said part serving to minimize stresses and fatigue in the join zone between two junction parts at the ends of two lengths of coaxial pipe to be joined together and between each length of pipe and each junction part at the ends thereof.