Abstract: A telescoping bleacher system having plural sectional rows of cantilever mounted seats and horizontal foot decks moveable between an extended use position whereat the rows are cascaded in descending order and a storage position in which the rows are superposed in vertical registration, and wherein plural guard rail units are permanently secured to the cantilever seats and foot decks for movement therewith between stored and extended positions; such guard rails being individually associated with each sectional row to provide vertically extending safety barriers across the exposed ends of the seats and foot decks and importantly operable to nest in a storage position within the foot well of each row without interfering with telescoping movements of the bleacher sections.

Abstract: A crowd control barrier is formed by a plurality of congruent rectangular fence panels joined end to end by pins in a plurality of sleeves secured to panel end posts in axi-ally aligned vertically staggered relation. A knee brace secured to adjacent panel end posts by cooperating knee brace sleeves stabilizes the barrier in cooperation with a base platform hingedly connected longitudinally with each fence panel opposite the knee brace on which pedestrians stand when adjacent the fence panels.

Abstract: A connection device for a playyard consists of a handle and two connectors. The handle is provided integrally with a block and a plurality of protrusions having a hole therein. A pair of connectors is each provided with a plurality of spaces for receiving supports and a projecting portion having a pin stably secured therein or pivotally connected with the protrusion. When the handle is connected with the connectors by a fastener, and a holding portion is in horizontal position, the connectors are not able to be folded because of the restriction of the block within two stops of the connectors, and when the holding portion is in vertical position, two connectors are able to be folded together.

Abstract: A portable fence panel for use on a support surface includes a rectangular frame member having a pair of side frame portions and a top and bottom frame portion. The frame portions have an outer and inner surface defining an aperture through the frame member. The panel includes crossmembers in the frame aperture for restricting passage therethrough. One of the side frame portions has at least one first connector portion extending therefrom defining a connector surface and having at least one aperture therethrough. The panel also includes at least one second connector portion extending from the other side frame portion having a connector surface which is substantially coplanar with the connector surface of the first connector portion. The second connector portions extend in a direction opposite the first connector portion and have at least one aperture therethrough. The panel also includes supports extending from the bottom frame portion.

Abstract: A gate which hingedly fits closely between two spaced apart fence posts is provided. The gate has a hinge side member which extends directly adjacent a fence post. The hinge side member includes offset portions, each of which is displaced from the respective fence post by a gap. A hinge extends from the fence post across the gap of each offset portion to hingedly couple the gate to the fence post. The gate also has a latch side member which may be removably secured about another fence post. A sleeve having a gate latch coupled thereto is rotatably coupled about the latch member. The latch member has a slot extending therethrough and the sleeve has a notch extending therethrough. The sleeve may be rotated to a locking position on the latch side member where the notch is located over a portion at the slot. A rod extends inside of the latch side member. The rod has a cap end and a hooked end. The hooked end of the rod may be adjusted in the slot and notch by moving the cap end.

Abstract: Partitions formed of edgewise connected panels have not historically had the capability of following vertical curves as required by naturally rolling terrain. My self-supporting edgewise connected partition formed of substantially triangular shaped panels (10, 12, 14, 16, 18, 20, 22 and 24) has the capability to simultaneously follow a straight or curved vertical alignment and a straight or curved horizontal alignment in any combination. Both the flexibility of the partition and its ability to support itself result from it being formed of a plurality of two differently shaped panels (10 and 12). The panels are shaped in such a way that, when their abutting edges are joined, the lower edges cross back and forth across the alignment (be it straight or curved) defined by upper edges.

Abstract: An assembly for extending a vertical height of a fence. The inventive device includes a plurality of mourning posts securable to opposed sides of an existing fence. A plurality of panels extend between the posts and rest upon a top surface of the fence so as to extend an effective vertical height of the fence.

Abstract: A collapsible, portable child's play-pen, which may be foldably collapsed onto two half-members which are pivotably coupled together along an axis and which together form a base for the play-pen, which may then be subsequently folded together to form a compact portable unit. First and second frame members, each pivotably coupled to the base along parallel but mutually opposite edges of the base, form one set of opposite side walls of the play-pen. Each of the first and second frame members are provided with a respective pair of first and second pivotable linking arms. One end of each of the first pair of linking arms is pivotably coupled to a first frame member, and similarly one end of each linking arm of the second pair of linking arms is pivotably coupled to the second frame member.

Abstract: A play enclosure apparatus includes a plurality of panels that are detachably connectable to each other at their sides to form a play enclosure. The panels may be connected to form enclosures of various shapes, and two of the panels may be connected to trap the remaining panels between the two panels for portability or storage.

Abstract: This invention relates to fence apparatus that is constructed from modular assemblies which permit compact transport of the fence from the manufacturer to the field where set up and assembly of the modular elements may be quickly and effectively made into a perimeter fence to prevent entry of animals and bovine into the area fenced.

Abstract: A security gate for positioning within an area way such as a doorway. The gate includes a support structure defined by a frame and a flexible panel supported by the frame. The frame includes horizontal members and vertical members wherein the vertical members may be conveniently folded to a position parallel to the horizontal members whereby the gate is folded to a compact configuration for transportation or storage.

Abstract: The present invention relates to a coupling (10) for connecting railing members (170, 171) to post (14, 15). The coupling (10) has a mounting portion having two parts (16, 117) pivotally movable relative to one another and capable of being locked against pivotal movement by a fastener (35, 113). Railing connection members (22, 25) are pivotally coupled to parts (16, 17) about axes (24, 26) extending transversely of the members and to an axis (20) about which the parts (16, 17) may pivot relative to one another.

Abstract: The present portable fence is durable, lightweight and easily transported, erected and dismantled. In use, it will collapse upon impact, due to a break away, in the first embodiment, a joint between the fence post and its supporting leg, and in the second embodiment a joint in the supporting leg, yet in both embodiments the fence may be quickly and easily re-erected.

Abstract: A portable, collapsible livestock corral utilizes a unique two-axis hinge mechanism at the intersection of each of the corral panels making it particularly suitable for use on uneven and/or rough terrain. A winch mechanism is used to facilitate the positioning of the panel units and when making the invention ready for transportation. Double hinged gate panels allow the invention to be conveniently positioned for the entry and exit of livestock into the corral.

Abstract: A children's play structure includes a hinged frame structure having mounted thereon a plurality of panels depicting murals or scenes. The hinged frame structure which is comprised of a plurality of hinging sections and which is of lightweight, simple and economical construction is provided with substantial rigidity by corner structures which include hinging apparatus at the upper and lower ends of vertical tubes to permit pivoting rotation of the corner structure relative to one but not the other of a pair of frame sections coupled thereby. Each of the upper and lower hinging apparatus includes a clevis and a lever releasably coupled to the horizontal tubes of the adjacent frame sections by plugs with resilient release tabs. The clevis and lever have interleaved legs which receive a shaft and an opposite cap within apertures therein to permit pivoting rotation between the lever and the clevis while at the same time providing substantial resistance to unwanted vertical flexure.

Abstract: In a fencing system for animals the conventional rigid fence panels are interconnected by flexible members which allow the fence panel to move each relative to the next to accommodate impacts by a fractured animal. Different embodiments are shown including an elastic block between the posts, a flexible metal spring between the posts, a simple strap wrapped around the posts in a FIG. 8 arrangement and a modified elastic strap arrangement which includes two free ends engaged over a pin passing through an end post of the panel and an intermediate leg portion for engaging between the end post and the end post of a next adjacent panel.

Abstract: A barrier structure includes a barrier and elongate support members. The barrier includes upper and lower engaging parts that engage the engaging portions of the elongate members adapted to receive the engaging parts. Securing elements fit on the supporting members to secure the upper engaging parts to their respective engaging portions. A method of erecting a barrier structure is also provided. First, the lower parts of the barrier are received into their respective engaging portions of the elongate support members. Then the upper engaging parts are received by their respective engaging portions and the securing elements fitted onto the support members.

Abstract: The present invention relates to a single post module which provides all the connections needed to make a fence. This module can be assembled, by unskilled persons, with other like modules to form fence posts by end-to-end assembly and connection. Each module in a post has a connector to which hollow fence rails or panel sleeves may be attached. Fence panels thus formed have a post at each end. Each module in every post has projecting hinge fins which, when overlapped with the fins of modules in similar posts, permits joining of up to four posts and their fence panels by making a pin connection at the common axis through the holes in the hinge fins at that location. This permits construction of a fence which can branch into as many as three new fences at any location.

Abstract: A free standing versatile baby barrier system comprising individual modules each having a flat stiff mat-like horizontal component and a flat vertical component of similar width attached at one end near a mid-section of the horizontal component such that the width of the vertical component spans the width of the horizontal component. The vertical component is of sufficient height to prevent the baby from climbing over the barrier to the protected side, and the horizontal component is of sufficient length to require the baby to stand or crawl on the horizontal component thus securing the horizontal component to the floor by the baby's own weight. Individual modules may be detachably linked together with hinge members attached to the lateral edges of the vertical components of the modules, allowing for rotation of the modules relative to one another to conveniently adjust the barrier system.

Abstract: A reconfigurable safety fence system for disposition relative to a fixed plane or area of reference includes a plurality of panels, each panel having a central vertical post including a swivel-mounted wheel at a lower base and, essentially symmetrically about an axis defined by the central post, respective upper and lower horizontal, and left and right vertical, perimeters of each of the panels, including vertical picket elements between the horizontal perimeters, each of the vertical perimeters including hinge elements for rotational movement and securement of each panel relative to that panel adjacent thereto about a vertical axis of each of the hinge elements in which a first vertical perimeter of a first of the panels of the system is secured to the area of reference.

Abstract: A folding portable play enclosure for children includes a plurality of panels connected in a series in an accordion-fold manner by a plurality of folding joints. The panels are formed by cardboard sheets sandwiched between inner and outer flexible vinyl layers. The folding joints are formed by the provision of spaces between the ends of each adjacent pair of cardboard sheets in the series. First indicia on one face of each of the panels simulates an exterior appearance of a home and includes trees, exterior windows, exterior doors, and fences, for example. Second indicia on an opposite face of the panels simulates an interior appearance of a home and includes furniture, interior windows, interior doors, and bookshelves, for example. Cooperating snap fasteners allow the enclosure to be selectively secured in an erected orientation forming a closed play space or in a compact collapsed orientation for transportation and storage.

Abstract: A crowd control barrier system is formed by regular barrier units interlocked end to end, with special wheeled units at intervals which provide elevated platforms for crowd surveillance. The special units can be converted to provide mobile storage racks for the regular units, which mobile racks can be wheeled onto a trailer or other vehicle for transportation and storage. The regular barrier units are formed of two continuous tubular members, one forming a frame for a vertical panel and one side of a base frame, and the other forming the other side of the base frame and vertical members welded to vertical portions of the first member to form vertical stanchions supporting the panel.

Abstract: A fencing system and a method for confining farm animals includes conventional rectangular fence panels having end posts and cross rails but the posts are connected by flexible elements of a type which allow the posts to flex apart when impacted by an excited animal. This prevents damage to the panel while maintaining the animal properly confined. Various examples of the flexible element are disclosed including an elastic band that is wrapped around the posts in a figure of 8 arrangement, a convoluted spring and an elastic block.

Abstract: A portable fence system including a snow fence panel having a wood frame of 2".times.6" posts bolted together at the corners, with a 4-foot wide strip of plastic snow fence material pulled taut across the center. Each panel is 8 feet long, with a height of 6'-8" or 8'-0", depending upon the application. In both cases the geometry of the frame is optimized for maximum snow trapping efficiency and maximum snow storage, and an opening at the bottom is optimized to eliminate the tendency for snow deposition at the fence. Panels are connected to one another by rebar pins passing through specially designed rotatably mounted U-clips, which also provide attachment to rebar anchors driven into the ground. The U-clip-and-pin connections allow rapid installation and take-down, and add flexibility needed for proper installation in irregular terrain. Panels can be overlapped at either the top or bottom as required to limit space between panels to 11/2", which improves trapping efficiency.

Abstract: Panel apparatus includes a plurality of panels which may be fabricated or assembled into enclosures of various types, as desired by a user. Adjacent panels are secured together by any of several different types of fastening or clamp elements. The particular clamp elements are selected according to the type of structure desired to be made from the plurality of panels, or the orientation of the panels. Panels may be made of various sizes, depending on the end use, but the general size of the panel elements may be the same, and accordingly the various fastening elements are suitable for panels regardless of the overall size of the panels.

Abstract: A free standing barrier structure consists of two or more modular panels of height and length significantly greater than thickness, disposed to extend generally along a fence line, and a connector for pivotal joining of adjacent modular panels. Each connector consists of a cylinder element of a first diameter and having an upper surface and a lower surface, and a rod element of a second diameter relatively smaller than the first diameter, the cylinder element and rod element being joined in coaxial arrangement. Each modular panel defines at least one vertical tunnel adjacent each end, each tunnel defining a first portion of size and diameter for receiving the cylinder element snuggly therewithin and further defining a second portion, coaxial with the first portion, of diameter for receiving the rod element therewithin, and joiners for connectors in tunnels of adjacent modular panels.

Abstract: A portable, foldable beach screen provides privacy and protection from wind and blowing sand for a reclining individual. The screen is constructed from a single panel and is foldable into a compact and easily carried configuration. The screen may include a reflective material on one or both major surfaces and can carry advertising messages or other printing.

Abstract: A collapsible portable corral for confining and directing the movement of livestock and the like. The corral has a front chute for providing an exit and entrance for livestock. A first and second front section are pivotally secured to the front chute, and a first and second intermediate section is respectively pivotally secured to the first and front section. A first and second rear section is respectively pivotally secured to the first and second intermediate section. Each of the first and second front sections is provided with a lever apparatus which is capable of raising or elevating a contiguous intermediate section relative to a front section and for holding the intermediate section in an elevated posture relative to the front section. Furthermore, each of the first and second intermediate sections has a similar lever device for elevating a contiguous rear section relative to the intermediate section and for holding the contiguous rear section in an elevated posture relative to the intermediate section.

Abstract: A moldable edge connecting apparatus is disclosed that can optionally be employed as a hinge. It is suitable for use as fencing and is particularly applicable to removable fencing. It employs integrally molded connecting fingers that are designed without deep slots, lips thereover, or fully circumscribed openings to economize on mold manufacturing cost and the expense and difficulty of operating the mold, rendering the invention appropriate to very low cost items. The entire structure is substantially coplanar with segments to be connected, even when used as a hinge, and utilizes half-round grooves that are substantially no deeper than the radius of the groove.

Abstract: Disclosed herein is a hoistway door assembly for use with temporary hoists. The assembly includes a center member pivotable about either a first or a second axis. The center member is latchable from either the front or back sides and has stacking portions. The assembly includes wing members rotatable about the first or second axis and being interchangeable with one another. The wing members have stacking portions for mateable connection with the center member stacking portions. The center member is symmetrical about its horizontal centerline and the stacking portions are also symmetrical about the center member vertical centerline. The wing members stacking portions are likewise symmetrical about the vertical wing members centerline.

Abstract: Simple, portable fence units for constructing fences are not new. It is also known to interconnect adjacent fence sections using pins and sockets. An improved version of a fence structure for constructing straight or angled fence sections in corrals or animal feeders includes a section or unit for connection to other similar sections or units including a rectangular frame with couplings on each end thereof. The coupling on one end is a pair of short, parallel tubes or sleeves which are welded together and welded to the end of the frame. The other coupling includes a pair of spaced apart tubes or sleeves for receiving the first coupling therebetween. When the outermost sleeves of the couplings on opposite ends of two adjacent frames are axially aligned and a pin is inserted therethrough, the two frames can be pivoted with respect to each other or define an angled length of fence.

Abstract: A barrier shield device, foldable and easily portable, for outdoor use in providing wind-protection or other shielding effects, particularly for use on a sandy beach. A plurality of panels are hinged for a composite shield-effect when folded outwardly for use; and a plurality of spikes, which are supportingly connected to the panels, are movable between an upper position for ease of transport and a lower position in which they are pushed into the ground to hold the panel assembly stable.

Abstract: A multiple panel unit for creating a play area for young children in which each panel has a rigid rectangular frame and is connected to an adjacent panel by a hinge structure at the top and bottom of the panels permitting the panels to be pivoted with respect to each other at the hinge. The top of a first of two adjacent panels and the corresponding end of the hinge structure are formed for releasably retaining the end of the hinge and the bottom of the second of the adjacent panels and the corresponding end of the bottom hinge structure are formed with a pin and a mating recess that are matable in a direction parallel to the hinge pivot axis.

Abstract: A self closing lockable hinge system including a pin member and a sleeve member rotatable about the pin member. The pin member and the sleeve member have associated therewith mutually engageable surfaces such that upon rotation of one member relative to the other the sleeve member is movable from a lower closed position to an upper open position relative to the pin member. This movement is caused by engagement of the mutually engageable surfaces. There is also provided lock to retain the sleeve member in the lower closed position whereby in the closed position relative rotation between the pin member and the sleeve member is prevented. The lock comprises register means movable between a first aligned position whereby the movement of the sleeve member is permitted and a second misaligned position wherein the movement of the sleeve member is prevented.

Abstract: A particulate material control apparatus is disclosed which includes longitudinally extending fin members attached at one end to a vertical post. The fin members are capable of rotating about the vertical post in an arc limited by adjacent posts or other stopping mechanisms. The fin members close against an adjacent post when wind or water currents flow across the area to be protected preventing wind or water erosion of sand, silt or soil in that area.

Abstract: Gate closure apparatus for closing a gate mounted pivotably on a gate post, such apparatus for connection to the gate and gate post and for developing and storing energy upon opening of the gate, and upon release of the gate, the gate closure apparatus for releasing the energy to produce and apply torque to the gate sufficiently large to close the gate; such apparatus may include a coil spring wound in a predetermined direction and having a normal state, upon the gate opening the spring winding in a predetermined direction out of the normal condition (e.g. coiling further tightly) to develop and store the energy, and upon release of the gate, the spring unwinding and returning to the normal condition to produce and apply the torque to the gate.

Abstract: An adjustable enclosure is provided for young children including a plurality of inner panels and a pair of end panels formed of tubes connected in a rectangular shape with a section of mesh material extending therebetween. The panels are connected in pivotal relation by hinge means designed to articulate approximately 300.degree. allowing the panels to be folded together compactly for easy transport, an also to resist pivotal motion to a degree whereby young children cannot readily pivot one panel relative to another.

Abstract: A fence line is provided including a pair of spaced posts between which a fence opening is defined and wherein a cattle guard is substantially centered in the opening and spans considerably less than the width of the opening. A pair of edge upstanding panel-like wing closure members are provided at opposite sides of the opening between the posts and the adjacent sides of the cattle guard and pivot structure pivotally mounts first corresponding upstanding base edge portions of the closure members at the opposite sides of the opening for angular displacement about upstanding axes and with the closure members including second free swinging upstanding edge portions opposite the first edge portions swingable toward and away from closed positions with the second edge portions at least closely adjacent the opposite sides of the cattle guard and an upstanding plane containing the fence line opening.

Abstract: A livestock feeder for hay bales, stacks and the like comprising fence-like sides and ends hinged to each other at their ends and pivotally supported on posts centrally secured to the ends, to permit movement from a normal rectangular configuration to one of a parallelogram with the side sections closer to each other. Such a construction permits animals feeding along the sides of the feeder, to have access to feed in the center of the feeder as they bear against the sides thereby collapsing them inwardly.

Abstract: A concrete serpentine noise barrier formed by a series of vertically disposed concrete panels that are placed in end to end abutment. Each adjacent pair of panels is provided with a socket-like joint that allows the panels to be angularly adjusted in assembly.

Abstract: A protective guard for a combustion appliance is disclosed which comprises a front frame having a pair of vertical frame portions between which a protective guard body is provided; a pair of side frames which at one end are rotatably supported on the vertical frame portions of said front frame on both ends thereof; and a cross beam member on both ends thereof slidably engaging the side frames. When the cross beam member is positioned at the upper ends of the side frames, the side frames are so rotatable about the axes of the upper ends of the vertical frame portions of the front frame that the side frames are able to be inwardly folded, and when the cross beam member is positioned at the lower ends of the side frames, the side frames are so fixed in an unfolded manner that they cannot be rotated. Thus, it will be noted that the protective guard can be fixed so that it can surround a combustion appliance in a stable manner.

Abstract: A play enclosure for a child, the play enclosure including two rings formed of pivotally connected links and a plurality of rods extending between the two rings.

Abstract: A hay enclosure includes two end sections and two sections along each side. Diagonally opposite side sections are equal in length, although the two sections on each side have different lengths. The enclosure is pivotally movable to a second position wherein two triangular-in-shape enclosures are formed having an area smaller than the rectangular enclosure area. A circular enclosure includes four arcuate sections which may be collapsed about a bale of hay into two pillow-shaped enclosures. Adjacent sections are pivotally interconnected by vertically spaced apart hinges, with the upper hinge including a downwardly extending pin received in a sleeve, and the lower hinge including a pair of abutting vertically aligned sleeves in which a movable pin is received.A horse hay feeder section includes inverted spaced apart U-shaped spacers providing horse head feeding stations therebetween and being open at the top whereby a horse may raise its head and turn it away over one of the adjacent spacers.

Abstract: A trailer for loading and unloading fences and includes two rollers at the rear of the trailer for assisting passage of fence sections onto the trailer. The rollers are drawn via a pulley which is movable into and out of contact with a wheel of the trailer. A sprocket is connected to the pulley and one roller and an endless chain engaged the sprocket to drive the rollers. The trailer may be tilted relative to its drawbar to assist in loading and unloading the fences.

Abstract: A portable fence and a trailer for unloading the fence and reloading the fence are disclosed. The fence includes at least two fence sections connected end to end. Stop means are provided to limit the amount of swing between fence sections at the connected end. Remote ends of the fence sections have components of hinge means which allows unrestricted rotation at the remote ends when such are connected together. The stop means and the hinge components which allows unrestricted rotation allow the fence to take up a self supporting V-shape when placed on the ground.The trailer has two housing portions to allow the trailer to be towed both forwardly and reversely. The trailer has rollers at one end which are driven from the rotatable wheels of the trailer to assist in the loading and unloading of the fence to and from the trailer.

Abstract: The present invention relates to an improved ornamental integrally molded plastic fence section. The fence section generally includes a pair of substantially parallel stringers with a plurality of pickets formed integral with the stringers. Said pickets being oriented substantially perpendicular to the stringers. Each stringer has a plurality of identical spaced ears formed integral with one end. Each of the ears has a rod aperture extending therethrough. The rod apertures in the ears on one end of a stringer are aligned with rod apertures in ears on the other stringer. A slot is formed in each ear extending from the exterior of the respective ear to the respective aperture. Each slot in each ear on one end of the section is aligned with the other slots in the other ears on that end of the section. A second plurality of supports is formed integral with the other end of each of the stringers. Each of the supports has a height less than the distance between adjacent ears in the first mentioned plurality.

Abstract: A plurality of identical panel sections are pivotally interconnected by a pin received in aligned sleeves. The sections may pivot in one direction until adjacent corners abut and in the opposite direction until the sections abut against a horizontally extending pin end portion thereby limiting further the angle of pivotal movement.

Abstract: Relative rotational movement is allowed between two longitudinally extending articulated members connected by a joint while at the same time longitudinal relative translation of the members is restrained. Each joint is composed of two substantially identical halves with each half having parallel semi-cylindrical slots provided therein cooperating with the semi-cylindrical slots of the opposite half to form cylindrical apertures for receiving the longitudinally extending articulated members. Each semi-cylindrical slot has a circumferential groove about its periphery. The grooves of cooperating semi-cylindrical slots meet to provide a complete circumferentially extending groove for receiving a pin inserted through the member received in that aperture. In this manner, rotary motion of the longitudinally extending member is allowed to a full 360.degree..

Abstract: An audience control barrier for use with an elevated stage, for maintaining physical separation for performers on the stage from an audience on the other side of the barrier. The barrier is modular in form, each module including a rigid panel and brackets for supporting the panel in vertical orientation. Interconnection means on the panels permit edge to edge interconnection of modules to form a stage barrier of the desired width. According to a preferred feature, the brackets which support the panels include a top bracket having an angled flange which may be driven into wedging engagement with the top edge of the panel to hold it in place. Means are provided for interconnecting the brackets which support the panels to the legs of the stage. In a preferred form, the interconnection means comprises a hook plate configured to fit around more than half of the periphery of the stage leg, and a flipper or gate which may be moved to locking position to secure the barrier to the stage legs.

Abstract: A panel structure for animal pens in which downwardly extending stems are disposed near the top and bottom of one end thereof, and a supporting structure is provided with ring-like fixtures for receiving said stems. A bracket is disposed above one of said stems and has a pivoted element which swings between the horizontal and a downwardly extending vertical position for retaining the stems in their assembled position in the ring-like fixtures. One or more sets of upper and lower ring-like fixtures and brackets with a pivoted element thereon may be provided at the opposite end of the panel to facilitate completion or extension of the pens. The pens are preferably constructed of upper and lower rails with horizontally spaced vertically arranged bars connected to the rails to form a rigid structure.