Abstract: This invention relates to a security apparatus for trade show booths comprising a flexible cover section to enclose an opening in a booth structure and a means for securely fastening the edges of the cover section to an opening of a booth structure so as to provide a securable removable cover to deter individuals from stealing merchandise from a display booth or otherwise enclose the booth for privacy. In one embodiment, adjustable fasteners that are used to secure the vertical edges of the cover are provided in a manner that does not permit removal from outside of the cover when installed. Optional hangers are also used to hang the top edge of the cover to a support structure. Additionally, the cover may be provided with an adjustment belt to ensure that the cover remains taut on the support structure when locked in its fastened position.

Abstract: A system for structural support of light weight outdoor tents and shelters utilizing two or more hiking or trekking poles and a connecting light weight ridge pole assembly that serves as the roof support truss providing the occupant(s) will full head room use for the width of the ridge pole assembly.

Abstract: Embodiments of the invention provide a portable wind break device which incorporates lightweight staking devices or mounting supports, poles that allow attachment of flexible panels, such as fabric panels, and reinforcing supports which reinforce each panel section, making a modular unit as a whole. The portable wind break device permits ease of portability, set up, take down, and provides wind protection and privacy for people, animals, or anything that would benefit from protection from the wind or privacy. Additionally, the portable wind break device permits easy cleaning, and assembly without tools.

Abstract: An easy to use, universal, simple, lightweight, compact, portable and modular system of concealment and shelter. An operator can configure a number of concealment blinds or shelters using brackets, supports, segmented shafts, covers, curtains, and skirts, and more complex modules. The segmented shafts have both the ability to make an attachment to retain a particular configuration while being able to break down the shafts for transportation or storage. The brackets and supports can be used to secure a configuration to a tree, the ground, or a hand held device. More advanced modules include cover caps including domes, cylindrical arches, and pyramids. A configuration can include a removable floor. Guyline modules allow for sliding panels to be positioned over openings in a configuration. The system can be configured for placement on a hillside or over rough terrain and obstacles.

Abstract: Shelter structures having a shelter portion supported (internally or externally) at an apex and one or more peripheral support elements supported by an external suspension web provided externally of a perimeter of the shelter portion are provided. One or more external suspension webs may be provided at a transition region of the structure formed at the interface of upper and lower portions, or at a base portion of the structure, or intermediate transition and base regions of the structure. A lower enclosure portion may provide wall-like structures, or may form an open network of lines, straps, wires, or bands. In some embodiments, the upper and/or lower shelter portion(s) are provided as fabric structures; in some embodiments the upper and/or lower shelter portions are provided as rigid or semi-rigid panel-like structures. Support systems, kits for assembling structures, reinforcement features and methods for assembling structures are also disclosed.

Abstract: A quick-release structure for a frame rod of a tent includes an upper rod, a middle rod, a lower rod, an upper joint, a lower joint and a quick-release assembly. The upper joint includes a first joint head and a second upper joint head. The first upper joint head is connected to the upper rod, and the second upper joint head is connected to the middle rod. The first upper joint head includes an eccentric cam. The lower joint includes a first lower joint head and second lower joint heads. The first lower joint head is connected to the middle rod, and the second lower joint head is connected to the lower rod. The quick-release assembly includes a pipe, a pulley, a pulley seat, an upper pin, an upper spring, a lower pin and a lower spring.

Abstract: A tent structure, water transfer system and sprinkler mechanism are provided. The water transfer system utilizes components of the tent structure to transfer water from a garden hose to the sprinkler mechanism positioned at the top of the tent structure to spray water above the tent structure.

Abstract: A quick folding structure for a post unit of a tent frame includes upper, middle and lower posts, an upper connector, and a lower connector. The upper connector is disposed between the upper and middle posts and includes a first upper connecting portion and a second upper connecting portion. The lower connector is disposed between the middle and lower posts and includes a first lower connecting portion and a second lower connecting portion. A wire rope has a first end secured to the first upper connecting portion and a second end connected to a pin. A spring and the pin are disposed in a ladder-shaped trough of the first lower connecting portion. Two ends of the spring engage with the ladder-shaped trough and a first end of the pin, respectively. A second end of the pin faces an engaging notch of the second lower connecting portion.

Abstract: A tent pole assembly that includes first and second pole sections, first and second inserts, and a projection member. Each of the pole sections includes an open end. The first and second inserts are positionable into the open ends of the first and second pole sections, respectively. The projection member is insertable into the first and second inserts to releasably connect the first and second pole sections together.

Abstract: A support apparatus includes a rectilinear central pole having axially opposed end portions. The pole includes a plurality of oppositely spaced female portions and a male portion slid ably engageable therewith. Each female portion has a plurality of apertures equidistantly spaced along a longitudinal length thereof. The male portion is medially nested between the female portions wherein the female portions are telescopically movable. The apparatus further includes first and second pairs of telescopically adjustable and rectilinear leg members connected to the opposed end portions of the pole and extending away therefrom, respectively. The apparatus also includes a mechanism for independently pivoting each of the first and second leg members about a fulcrum axis centrally registered with the pole and extending parallel thereto. The apparatus also includes a mechanism for independently pivoting the first and second members along a unique arcuate path and about a fulcrum axis.

Abstract: A telescoping pole assembly for an erectable, collapsible shelter, includes first and second hollow telescoping sections slidably connected together, the first telescoping section being slidably disposed within the second telescoping section, and a spring loaded detent pin mounted to the second telescoping section. A weighted internal stop member is slidably disposed within the first telescoping section for movement between a first position and a second position. The internal stop member blocks the spring loaded detent pin in the first position, and the internal stop member does not block the spring loaded detent pin in the second position.

Abstract: A locking device for a tent comprises a pole 2, a lock base 3 installed to allow hoisting/lowering of the pole, a lock hole 4 provided the pole, and a lock pin 5, provided movably within the lock base in the longitudinal direction, thus enabling the lock pin to be in a locking position to allow it enter the lock hole, or to be retracted to an unlocking position, to allow the lock pin to disengage from the lock hole. An elastic body 6 pushes the lock pin towards the locking position all the time. An operating lever 7 provided on the lock base can move the lock pin to an unlocking position; a coming-off prevention and holding means 8 allows the lock pin to be placed in a safety position for preventing accidental unlocking.

Abstract: An easy to use, reliable, easy to repair, universal, simple, lightweight, compact, portable, multi-use modular system of poles and interconnections. An operator configures a number of structures using brackets, supports, segmented shafts, and interconnection components. The segmented shafts have both the ability to make an attachment to retain a particular configuration while being able to break down the shafts for transportation or storage. Some embodiments include a sleeve that protects the tip of a pole and provide a cushion and separation between a pole and a ferrule thereby reducing breakage and increase reliability. Broken components are easily replaced in the field. The configuration of the structure is changed by the user to quickly adapt to changing needs. Multiple components can be carried by separate members of a group and combined together to form a more complex structure to meet the needs of the group.

Abstract: An elongated structural support member for truss sections of collapsible shelters having a cellular core structure including internal dovetailed wall portions and an internal medial wall portion joined at opposite ends to the dovetailed wall portions.

Abstract: A telescoping pole assembly for an erectable, collapsible shelter, includes first and second hollow telescoping sections slidably connected together, the first telescoping section being slidably disposed within the second telescoping section, and a spring loaded detent pin mounted to the second telescoping section. A weighted internal stop member is slidably disposed within the first telescoping section for movement between a first position and a second position. The internal stop member blocks the spring loaded detent pin in the first position, and the internal stop member does not block the spring loaded detent pin in the second position.

Abstract: A pole brace and ballasting device having at least one or more releasably connecting weight containers adapted to retain and discharge a dry or fluid load bearing material therein of adequate length and sufficiently ridged to brace a pole. A hand activated clamp or clamps for attachment to a variety of pole dimensions both angular and round, while allowing for the closing of the tent's outer protective cover; with the capacity to selectively suspend the ballasting load to prevent it from coming at rest with the ground for an increase in its effectiveness.

Abstract: The invention relates to a retractable rod and a tent made from the rod. The retractable rod comprises a multitude of rigid skeleton joints having two axial end surfaces and side surfaces. The joints are connected through the convex-concave connection by two flexible ropes passing through the holes of the joints to form a rod. There is a storage compartment locating at one end of the rod which winds and stores the rod therein. The storage compartment comprises a shaft, a rod storage sleeve which is in an intermittent drive mode fixed to the shaft; one end of the two flexible ropes passes through the rod storage sleeve and is fixed to the shaft. The rod storage sleeve is supported and rotates between two rope-protecting boards. A tension part locates at the other end of the rod and the other end of the two flexible ropes is fixed to the tension part. The advantage of the invention is that the tent made from the retractable rod occupies a small storage space.

Abstract: This invention relates to a telescopic post for a folding structure, which can be used to move the structure from a raised deployed position to a folded position, and vice versa. The inventive post includes a lower element which can slide inside an upper element which is solidly connected to the structure. The lower part of the lower element rests on the ground to form a base. The upper element is solidly connected to a movement device, such as caster. The caster projects downward from the base in the folded position, but is withdrawn in the deployed position owing to the vertical movement of the upper element.

Abstract: A pole brace and ballasting device having at least one or more releaseably connecting weight containers adapted to retain and discharge a dry or fluid load bearing material therein of adequate length and sufficiently ridged to brace a pole. A hand activated clamp or clamps for attachment to a variety of pole dimensions both angular and round, while allowing for the closing of the tent's outer protective cover; with the capacity to selectively suspend the ballasting load to prevent it from coming at rest with the ground for an increase in its effectiveness.

Abstract: This invention relates to a security apparatus for trade show booths comprising a flexible cover section to enclose an opening in a booth structure and a means for securely fastening the edges of the cover section to an opening of a booth structure so as to provide a securable removable cover to deter individuals from stealing merchandise from a display booth or otherwise enclose the booth for privacy. In one embodiment, adjustable fasteners that are used to secure the vertical edges of the cover are provide in manner that does not permit removal from outside of the cover when installed. Optional hangers are also used to hang the top edge of the cover to a support structure. Additionally, the cover may be provided with an adjustment belt to ensure that the cover remains taut on the support structure when locked in its fastened position.

Abstract: In a pole (11) for holding and/or supporting tent sheets (3, 5) that can be assembled from interconnecting segments (15) to make an arch (12), the individual segments (15) can be connected together by intermediate elements (16) that can be inserted into them and a tensioning element (21) can be suspended from each of these intermediate elements (16) on the inside of an arch (12), with the ability for the tensioning elements (21) to be tensioned in the area of the ends (13, 14) of the pole (11). This configuration means that the tent (1) is always stable and its interior is not partitioned off or subdivided by tensioning straps. Also, the tent (1) can be pitched and struck within a short period of time (FIG. 1).

Abstract: A tent and tent frame structural members are provided. The structural members include utility channel to which devices such as hooks, carabineers and wire trays can be mounted to the structural member. More particularly, mounting structures of the devices insert into the utility channel and secure the devices to the structural members. The utility channel can include at least one undercut to prevent removal of the mounting structure, and ultimately the devices, from the structural member.

Abstract: A supporting device for supporting a cloth element, for example a camouflage net. The supporting device (1) comprises a hollow rod (4), at least one supporting element (12) and an attachment device (50). The supporting element (12) is attached at a proximal end (16) to the attachment device (50). The supporting element (12) can assume the following positions:—a first, retracted position where the supporting element (12) is at least partly mounted inside the hollow rod (4), and—a second, extended position where a distal end (18) of the supporting element (12) is arranged at a distance out from the central longitudinal axis of the hollow rod (4).

Abstract: A locking device for a tent comprises a pole 2, a lock base 3 installed to allow hoisting/lowering of the pole, a lock hole 4 provided the pole, and a lock pin 5, provided movably within the lock base in the longitudinal direction, thus enabling the lock pin to be in a locking position to allow it enter the lock hole, to be retracted to an unlocking position, to allow the lock pin to disengage from the lock hole. An elastic body 6 pushes the lock pin towards the locking position all the time. An operating lever 7 provided on the lock base can move the lock pin to an unlocking position; a coming-off prevention and holding means 8 allows the lock pin to be placed in a safety position for preventing accidental unlocking.

Abstract: This trampoline enclosure net design relates to a rebounding mat assembly and an enclosure net that surrounds the periphery of the rebounding mat assembly. The enclosure net is attached to the rebounding mat assembly by the enclosure net poles. The enclosure net pole includes: the body of the pole that is attached to the rebounding mat assembly and a connection assembly that sits at the top end of the body of the pole; a hanging hook is placed at the connection assembly; the hanging hook is connected to the enclosure net pole through an extendable piece. A connection assembly is placed at the top end of the pole; a hanging hook is placed at the connection assembly; the hanging hook is connected to the enclosure net pole through an extendable piece, allowing the enclosure net to expand and contract and buffer impact by user on the enclosure net.

Abstract: A telescoping pole assembly for an erectable, collapsible shelter, includes first and second hollow telescoping sections slidably connected together, the first telescoping section being slidably disposed within the second telescoping section, and a spring loaded detent pin mounted to the second telescoping section. A weighted internal stop member is slidably disposed within the first telescoping section for movement between a first position and a second position. The internal stop member blocks the spring loaded detent pin in the first position, and the internal stop member does not block the spring loaded detent pin in the second position.

Abstract: A collapsible tentpole includes a series of hollow shafts, connected by insertion into each other, and an elastic cord arranged in the shafts with both ends secured to the two endmost shafts, wherein at least one groove is arranged on at least one end of the shaft.

Abstract: The present invention is a lightweight tent having a sloping roof that overhangs the door and preferably the base of the tent as well at one or both ends. This latter slope allows the tent to be erected using a single supporting member, and provides good ventilation while simultaneously providing good protection from the elements. The lightweight tent is constructed from a waterproof canopy having generally trapezoidal sides joined to a floor that preferably tapers from the front to the rear. Its roof slopes downward from the front to the rear, with at least its front side edges tilting toward the ridgeline at an angle less than ninety degrees.

Abstract: This invention relates to a security apparatus for trade show booths comprising a flexible cover section to enclose an opening in a booth structure and a means for securely fastening the edges of the cover section to an opening of a booth structure so as to provide a securable removable cover to deter individuals from stealing merchandise from a display booth or otherwise enclose the booth for privacy. In one embodiment, adjustable fasteners that are used to secure the vertical edges of the cover are provided in a manner that does not permit removal from outside of the cover when installed. These fasteners may comprise a hooked end, an arc-shaped engagement end and a tightening member between said hooked end and engagement end which work together to secure the vertical edges of the cover.

Abstract: A lightweight, collapsible foot pump made of a lightweight, collapsible material and filled with a foam like material which features large open cells to contain a large volume of air. The foam acting as a return spring for the pump.

Abstract: A collapsible canopy frame is provided that includes elongated side poles each having a side and an end; and a plurality of wheel assemblies each having a mounting post and a wheel. The mounting post of each wheel assembly is supported on and extends transverse to a corresponding one of the elongated side poles.

Abstract: A telescoping pole assembly for an erectable, collapsible shelter, includes first and second hollow telescoping sections slidably connected together, the first telescoping section being slidably disposed within the second telescoping section, and a spring loaded detent pin mounted to the second telescoping section. A weighted internal stop member is slidably disposed within the first telescoping section for movement between a first position and a second position. The internal stop member blocks the spring loaded detent pin in the first position, and the internal stop member does not block the spring loaded detent pin in the second position.

Abstract: A portable barrier panel for providing privacy to a screened area comprises a plurality of vertical support tubes. The portable barrier panel further comprises a plurality of elongate legs having an adjustable length. The elongate legs attached to a lower portion of the vertical support tubes, such that an angle ? exists between the elongate leg and the vertical support tube axis. The angle ? is adjustable. The portable barrier panel further comprises an elongate horizontal framing member having first and second ends that are supported by top two different vertical support tubes. The portable barrier panel further comprises an opaque curtain mounted to the horizontal framing member and at least one of the vertical support tubes.

Abstract: The quickly erectable canopy shelters include a plurality of legs connected together by an extendible perimeter assembly of link members. The roof structure is formed by a pole members pivotally mounted to the upper ends of the legs so as to extend across the shelter, and movable between a lowered position and a raised, upwardly arching position. The pole members are pivotally coupled to a central hub, and each of the pole members is formed of pole sections hinged to permit downward folding and upward unfolding until they are fully extended. Corner support strut members are pivotally mounted to the extendible perimeter assembly of link members adjacent to the legs, to support the pole members. The outer ends of the pole members are pivotally connected to the upper ends of the legs by pivoting link members that pivot between a lowered position and a raised position extending above the legs when the shelter is extended.

Abstract: The present invention provides a tent pole assembly for shoring up, which comprises a bottom pipe made of iron, a top pipe made of fiberglass reinforced plastic, and a connecting portion for connecting said bottom pipe and said top pipe. Said connecting portion is provided with a insertion portion and a protruding ring disposed along with exterior surface thereof. When said insertion portion inserts into one end of said bottom pipe, said protruding ring shores up said bottom pipe.

Abstract: A side cover structure for a collapsible tent includes a fabric side cover that is vertically suspended between two post. Each post has inner and outer pole sections that are telescopically engaged. Each pole section has exterior longitudinal grooves. The fabric side cover has beads or flanges, sometimes referred to as keder-profile, which are slidably inserted into those longitudinal grooves for securing the cover in place.

Abstract: The erectable, collapsible shelter has a canopy with at least three sides and three corners, a leg assembly, and a perimeter truss linkage assembly having a plurality of perimeter truss pairs of link members connected to the leg assembly. The legs preferably have telescoping upper and lower sections with lower section for engagement with ground, and a slider member slidably mounted to the upper section of each of the legs. A canopy peak support assembly is provided that is movable between a raised position and a lowered position, with the canopy peak support assembly supporting the canopy above the top of the leg assembly in the raised position.

Abstract: A ventilator for a covering for a boat or other object includes a dome for covering air venting openings. The air vents are provided in a pair of oppositely disposed ventilator plates. The boat or other covering is firmly clamped between the ventilator plates by means of a nut that can be tightened by hand. The venting openings are disposed one above the other with no obstructions therebetween in order to allow for direct air transfer between the inside and the outside of the cover while preventing weather elements from entering the cover.

Abstract: A quickly erectable structure includes expandable/collapsible top and bottom assemblies that are interconnected to facilitate forming an enclosure and to facilitate taking down the enclosure. Specifically, the bottom assembly includes a plurality of interconnected X-shaped subframes that combine to form a telescoping scissor frame. The top assembly includes a plurality of inverted foldable Y-shaped subframes attached together and to a top of the telescoping scissor frame in a manner that combines the two to form a stable umbrella-like overcenter top frame attached atop the telescoping scissor frame. A drawstring mechanism is attached to a peak of the structure to hold the top frame in an expanded position. Flexible covers are attached to the two frames, and a drawstring arrangement on the top cover allows flaps to be lifted to form 360 degrees of windows.

Abstract: The triangular, wedge shaped erectable shelter includes a canopy and a leg assembly supporting the canopy. A perimeter truss linkage assembly is connected to the leg assembly, and each of the perimeter truss pairs includes first and second link members pivotally connected together in a scissors configuration, with the outer end of each first link member connected to the upper end of a leg, and the outer end of each second link slidably connected to the leg. The shelter includes a flexible pole member removably mountable to the upper end of at least one of the legs of the shelter to extend across the shelter and support the canopy of the shelter. The flexible pole member is preferably removably mounted in an indexing hole in a bracket affixed to the upper end of at least one of the legs.

Abstract: The invention relates to the side covering (7) for a collapsible tent of a light variety, whereby the individual corner posts are each in two parts and comprise an upper (1) and a lower (2) section. Said sections may be telescopically placed one inside the other and may be locked together. The corner posts (1, 2) have grooves (3, 4) in the longitudinal direction, the diameter of which is different for the upper piece (1) and lower piece (2), such that they may be placed one inside the other. Moulded profiles (8, 9) may be placed in the grooves (3, 4), to which the side covering is fixed.

Abstract: A leg assembly includes at least three upright support members and at least three horizontal link members. Each of the support members includes an adjacent pair of planar first and second leg frames that are connected pivotally to each other, and at least one connecting plate disposed between the first and second leg frames so as to form an angle between the first and second leg frames such that the first and second leg frames can stand stably on a ground surface. Each of the link members is connected detachably to an adjacent pair of the support members so as to interconnect and position the support members relative to one another.

Abstract: A telescoping pole assembly for an erectable, collapsible shelter, includes first and second hollow telescoping sections slidably connected together, the first telescoping section being slidably disposed within the second telescoping section, and a spring loaded detent pin mounted to the second telescoping section. A weighted internal stop member is slidably disposed within the first telescoping section for movement between a first position and a second position. The internal stop member blocks the spring loaded detent pin in the first position, and the internal stop member does not block the spring loaded detent pin in the second position.

Abstract: A collapsible frame for use in erecting tents, canopies and the like at outdoor venues includes a plurality of telescopic legs for providing vertical structural support, and a plurality of top corner joints each fixedly mounted upon a top end of a corresponding telescopic leg. A leg slider joint is adjustably mounted upon each telescopic leg for sliding along that telescopic leg. A truss pair of link members is mounted to a pair of top corner joints and to a corresponding pair of leg slider joints mounted on adjacent pairs of telescopic legs for providing a scissors connector. Finally, a plurality of canopy support arms each including a flexible connector, and each fixedly connected to a top corner joint and a corresponding leg slider joint, is employed for raising and lowering the collapsible frame as a stable unitary structure.

Abstract: A segmented, articulated pole member structure is constructed of a plurality of pivotally interconnected, pole segments. The pole segments are arranged in an alternating or offsetting fashion such that in their disassembled state they may be folded into a compact bundle for storage. In the assembled state, adjacent pole segments are retained under tension in fixed angular position relative to each other by a pivoting connection and an engagement loop or similar structure. Applications for the pole member structure include the construction of flexible structures such as tents and shelters, and support frames for mounting, supporting, or suspending articles in a desired shape.

Abstract: A pull pin assembly includes: a first pole having a first hole; a second pole having a second hole, and sliding in the first pole; a main body having a central hollow containing the first pole; a pull pin body extending radially from the central hollow, and having a space extending into the central hollow; a pull pin, having a circumferential stop, disposed in the space to move from a first position extending into the central hollow through the first hole to a second position outside the central hollow; a pull pin plug fit into the space and having a hollow containing the pull pin; and a biasing member biasing the pull pin toward the second position to lock the first and second poles; wherein the biasing member is disposed to bias the pull pin between the circumferential stop and the pull pin plug.

Abstract: A steel pole for a rectangular dome-shaped tent is disclosed wherein a plurality of unit rods 1 are made of an elastic steel pipe with a certain thickness. One end portion of each of the unit rods is press-formed into an insert part 1a for being inserted into an insert hollow 1b of another unit rod 1, the insert part having a proper length and a proper diameter. The unit rods consist of straight rods 1A and bent rods 1B, the bent rod 1B being bent at a certain angle to support a corner portion between the tent ceiling and the tent wall. Each steel pole consists of a plurality of the unit rods 1 in the form of a straight rod 1A or a bent rod 1B, and the rods 1 are arranged in a number and in an order suitable to pitch a dome-shaped tent. A flexible and elastic string s passes through the unit rods thus arranged for forming an arched pole. Two arched poles A and B are installed on the ground, the top portion of the arched poles crossing each other for pitching a rectangular dome-shaped tent 2.

Abstract: A tent pole and a connecting structure thereof include a shaft tube part of a prescribed length formed at an end portion of the tent pole, a stopper disposed outside a slanted part of the shaft tube part to restrict an inserted depth of the shaft tube part and a finishing member disposed at the end portion of the shaft tube part. The shaft tube part is inserted into the tent pole, and the finishing member performs a buffering action to the collision of the shaft tube part of the tent pole against the end portion of another tent pole to be connected with the shaft tube part when the tent poles are connected.

Abstract: A crutch constructed of two adjacently located, elongated, parallel upper and lower bows which can be moved in relationship to each other to form a vertical support of readily varied length. These bows have the same design and are therefore interchangeable, significantly reducing inventory requirements. Each bow has a series of parallel horizontal notches with the bows positioned so that the notches on each bow are on contacting surfaces. A pin inserted into parallel, adjacent notches on the two bows in cooperation with two or more collars or caps on the ends of one end of each bow fixes the relationship between the shafts which, in turn, defines the length of the vertical support. A similar concept can be used to lock a moveable centrally located lower bow between two parallel outer upper bows. This assemble provides a strong, adjustable length crutch for any height patient using only two different pairs of bow lengths.

Abstract: A pull pin assembly includes: a first pole having a first hole; a second pole having a second hole, and sliding in the first pole; a main body having a central hollow containing the first pole; a pull pin body extending radially from the central hollow, and having a space extending into the central hollow; a pull pin, having a circumferential stop, disposed in the space to move from a first position extending into the central hollow through the first hole to a second position outside the central hollow; a pull pin plug fit into the space and having a hollow containing the pull pin; and a biasing member biasing the pull pin toward the second first position to lock the first and second poles; wherein the biasing member is disposed to bias the pull pin between the circumferential stop and the pull pin plug.