Abstract: The invention relates to a backstop assembly comprising a container (1, 1', 1", 1'") having an opening (11, 11', 11", 11"') covered up by a medium (2) and serving as a projectile entry opening, said container containing a particulate flowable granulate (3) as a medium for slowing down projectiles.

Abstract: Golf practice apparatus is for use in the practice of chip shots. The apparatus includes a bin formed of a fabric or fabric-like material, and wings which extend laterally to either side of the bin which are designed as catch fences for wayward balls. A frame is provided for supporting the bin in an erected condition, and the apparatus may be collapsed and rolled up into a bundle for storage when not in use.

Abstract: A trap for receiving a projectile travelling along a substantially horizontal axis of travel at high velocity includes a pair of side walls, and primary, secondary and tertiary deflecting plates. The primary plate obliquely intersects the axis of travel of the projectile to downwardly deflect the projectile or particles thereof to approximately a second axis of travel. The secondary plate obliquely intersects the second axis of travel to further downwardly deflect the projectile or particles thereof to approximately a third axis of travel. The tertiary pate obliquely intersects the third axis of travel to further downwardly deflect the projectile or particles thereof to approximately a fourth axis of travel. Each deflection shows particle velocity. A bottom surface extends below the plates so that the plates, the sides and the bottom surface define a rectangular mouth for receiving the projectile and a chamber for containing the projectile or particles thereof.

Abstract: A contaminant recovery system for a rifle range having an upstanding retaining wall which serves as a rear wall for the range. A sloped berm is located in front of the rear wall and serves as a target backstop. Drainage means are provided for collecting and diverting water which passes through the berm and for recovering contaminants in the water.

Abstract: A golf swing practice device has a netting supported from a frame to provide a wedge-shaped pocket. The length of the sides of the wedge are adjustable to permit the open end of the wedge to be rotated by rotating the portion of the frame supporting the open end of the wedge with respect to the portion of the frame supporting the length of the wedge to permit a golfer to stand within the opening while avoiding the frame of the opening with his swing.

Abstract: A portable, collapsible practice device which forms an enclosure for containing balls which are pitched, hit, kicked or batted into the enclosure is described. The device is attached to and supported by a permanent backstop or other structure at the practice area. The device comprises a pair of frame members comprising pivotally connected support, netting or other foldable material which is suspended from and between the supports thereby forming the enclosure, means for attaching one end of the supports to the permanent structure and wires or ropes for maintaining the rigidity of the device.

Abstract: The invention relates to a backstop assembly comprising a container (1, 1', 1", 1'") having an opening (11, 11', 11", 11'") covered up by a medium (2) and serving as a projectile entry opening, said container containing a particulate flowable granulate (3) as a medium for slowing down projectiles.

Abstract: A pitching trainer includes an automatic ball return includes a frame defining a ball-receiving chamber including a cushion at the back wall of the chamber, a floor therebeneath, and a ball-expelling machine connected to the floor for returning a ball cast into the chamber to the user. The cushion is configured to absorb the impact of the ball and allow it to drop onto the floor, which is preferably smooth-surfaced, inclined and provided with a hole through which the ball may pass to the ball-expelling machine. The cushion is provided with a target area, and an indicator which signals when a ball impacts the target area. A ramp may be provided at the front of the trainer whereby a ball directed below the floor of the chamber may be guided therein, and the ramp may be provided with indicia corresponding to a specific sport to assist the user in his efforts to hit the target area.

Abstract: A bullet trap for a horizontally fired bullet includes a passageway bounded by upper and lower flat plates which may be inclined to the horizontal at an angle of between 0.degree. and 7.degree.. The passageway has an entrance opening and a shallow exit opening or throat, and a generally spiral-walled spent bullet energy-dissipating chamber having a horizontal axis communicates substantially tangentially with the passageway through the throat. A white water lubricant is sprayed against the circumferential boundary wall of the chamber and engulfs any lead dust, spent bullets, and other particles, the lubricant then flowing down through the throat into the passageway and along the lower plate into a collecting vessel, flushing the lead dust, spent bullets, etc. into the vessel without possibility of escape into the environment. The self-cleaned lubricant is continuously recirculated from the collecting vessel to the spray head in the chamber.

Abstract: A bullet trap, for catching a projectile fired from a firearm not more powerful than a .44 Magnum handgun, includes a passageway which has an entrance opening and a shallow exit opening or throat, bounded by upper and lower flat plates inclined to the horizontal at an angle of between 0.degree. and about 15.degree., and a generally spiral-walled spent projectile energy-dissipating chamber which has a horizontal axis and communicates substantially tangentially with the passageway through the throat. The chamber wall has an initial part which is an upwardly curving extension of the lower plate and a terminal part which is located at the rear end of the upper plate, and the angle of inclination of the plates ensures that the projectile enters the chamber at a relatively low angle to the initial part of the chamber wall and moves along the latter without being shattered or damaging the wall.

Abstract: A practice backstop for ball playing sports has a support frame including a pair of crossed arcuate poles covered by a three sided enclosure, open at the front. A flexible target sheet is supported within the enclosure so as to be struck by and absorb the impact of balls directed at the backstop 10. The enclosure may additionally include a floor surface and a series of fasteners may be provided for supporting the target sheet at various front to back spaced apart positions within the enclosure.

Abstract: This invention relates to a firing ground consisting of standard modules (1, 21, 25, 36, 52) which are preferably realized according to the ISO standards, the firing ground comprising in particular a ball-arrester module (1), one or more intermediate modules (21) which are arranged in front of the ball-arrester module (1), a so-called "firing positions" module (25) arranged in front of the last one of the intermediate modules (21), and a so-called "firing controller position" module (36) provided next to the "firing positions" module (25), each one of the modules being provided with structure (11) for quick connection to the adjacent modules, as well as with structure (12) for electric and/or hydraulic lines and/or adjacent module ducts connection, and with tight sealing along the connection wall with the adjacent module, with wheels (20) for motion during the assembling operation of the firing ground, and with inside heat- and sound-insulation (14), in addition to a number of other ancillary modules which ca

Abstract: A bullet trap for a horizontally fired bullet includes a passageway bounded by upper and lower flat metal plates which may be inclined to the horizontal at an angle of between 0.degree. and 7.degree.. The passageway has an entrance opening and a shallow exit opening or throat, and a generally spiral-walled spent bullet energy-dissipating chamber having a horizontal axis communicates substantially tangentially with the passageway through the throat. The chamber wall, no part of which has a radius or curvature smaller than 28 inches, has an initial part which is an upwardly curving extension of the lower plate and a terminal part which is located at the rear end of the upper plate. A white water lubricant may be sprayed against the initial part of the chamber wall and, upon flowing down the same into the passageway and along the lower plate into a collecting vessel, may be recirculated to the spray head in the chamber.

Abstract: An apparatus for use in practicing pitching of baseballs to enable the user to improve pitching accuracy and to indicate pitched balls delivered within a strike zone having a vertical backboard with a rectangular opening therethrough, four trapezoidal shaped wings secured to the backboard and serving to form an opening defining a strike zone, each of the wings being pivotal when engaged by a baseball, electrical contacts activated as each trapezoidal wing is pivoted when struck by a baseball and electrical indicators for signaling when a baseball strikes one of the trapezoidal wings to indicate that the baseball has been pitched high, low, inside or outside of the strike zone.

Abstract: The apparatus of the invention comprises a backboard; a matrix of panels representing a strike zone; springs for resiliently biasing each of the panels outwardly from the backboard; switches mounted to the backboard behind the panels, whereby the impact of a pitched ball will move the panel inwardly towards the backboard causing the switch to momentarily close; a horizontal array of red, yellow and green lamps mounted to the backboard adjacent the top of the backboard, one lamp in vertical alignment with each of the columns of panels; a left vertical array of red, yellow and green lamps mounted to the backboard adjacent the left edge of the backboard, one lamp in horizontal alignment with each row of panels; a right vertical array of red, yellow and green lamps mounted to the backboard adjacent the right edge of the backboard, a power source; and electrical wiring to connect the power source, switches and lamps.

Abstract: A backstop frame for intercepting projectiles is disclosed as including a holding plate having a series of parallel slots in which a series of lamellas are mounted, fasteners, secured the plate to a supporting structure and connectors join the lamellas to the plate.

Abstract: Golf practice device such as a net or the like for use from within or outside a garage, the net being mounted internally of the garage door adjacent its upper edge in both a storage condition and a use condition and being rolled up on a bar or rod and supported out of the way on end brackets on the inside of the door in said storage condition. The mounting and brackets are designed so as to enable the door to be raised and lowered as needed when the device is in storage condition, and to further enable the door to be raised while the net is in its use condition, without obstruction of door movement and without risk of damage to the net or the door. The brackets themselves are also adapted to be mounted on either a vertical wall or suspended from a horizontal ceiling, in either of which locations, the brackets can serve for both storage and use of the net.

Abstract: A portable baseball batting practice device is disclosed as including a rectangular upright frame, defined by two separate upper and lower vertical frame sections retained and interposed by coupler units; frame is vertically supported by support members connected to each side of the upper vertical frame section and extending back vertically joined at support unit, retaining support members in position; a pair of extension legs join a baseball batting tee to the lower vertical frame section permitting horizontal to vertical rotation thereof; the baseball batting tee comprising of a pair of interchangable, flexible ball receiving elements and an upper tee stem inserted into a lower tee stem permitting height adjustability and retained vertically by tee base; a vertical flexible net is suspended from the upper vertical frame section covering the opening between the upper and lower vertical frame sections presenting an impact area for a driven ball.

Abstract: The flexible projectile arresting device is used typically in the playing or practicing of a ball game such as baseball, golf or soccer to restrict the flight of the ball to a limited area. The elements of the device include side and roof panels of flexible material, such as netting, loosely suspended by cord or rope between rigid compression struts or poles at corners. The struts are inclined so as to be located behind the panels out of the path of the ball or projectile. The tops of the struts are restrained by tension guys secured at the ground. The device moves upon impact by the projectile thereby absorbing and dissipating kinetic energy and preventing dangerous rebound. The device returns to its original shape after impact.

Abstract: A training device (b 10) for receiving thrown, hit or kicked balls includes a main frame (11) carrying a target frame (14) defining an open target area which is backed by a net (15). The size of the open target area is adjustable so that the user may practice with target areas of varying sizes. Adjustment of the target size is made possible by the provision of horizontal and vertical frame members, the horizontal frame members (23) being slidably adjustable on the vertical frame members (19). A plurality of spaced apart grooves (27) are placed along the vertical frame members (19) and an elastic ban or O-ring (28) is selectively placed in a groove (27) to hold the horizontal frame members (23) in a predetermined position.

Abstract: A self-regeneration ballistic projectile-arrester, suitable for small arms indoor firing ranges comprises granulated material in form of a heap, to absorb the kinetic energy of the fired projectiles. A pair of belts moving in opposite and converging directions, and being inclinable with respect to the firing plane and being spaced from and opposite to one another, are arranged as supports at the bottom of the material heap with their longitudinal axis parallel to the firing axis, for conveying the material towards a zone where it is separated from the exploded projectiles. The regenerated material is then carried onto the top of the heap for recycling.

Abstract: A new game is disclosed, involving substantially the same rules as American football (e.g., NFL or NCAA) except that kicks or passes into the end zone may be deflected back onto the playing field as a playable ball by a rebounding assembly that surrounds the goalposts. Upon an attempted field goal, an errant kick will result in the ball hitting the rebounding assembly instead of passing between the vertical uprights of the goalpost. The reflected ball can be caught before it hits the ground by only players of the team defending the goal. Once caught, the defending team may advance the ball toward the opposite goal in accordance with the normal rules of American football. If the ball reflected off of the rebounding assembly hits the ground before it is caught by a player of the team defending the goal, the ball is free for players of either team to advance.

Abstract: A ball and target net game apparatus is set forth wherein a target net includes a perimeter framework securing a generally planar net wherein the frame work includes a plurality of forwardly extending horizontal legs and associated bracing to maintain the netting in a secure arrangement in use. The framework and the legs of the apparatus are telescoping to effect a compact structure easily stored when not in use. An inner net is selectively securable to spaced elongate straps longitudinally secured relative to the main net portion of the apparatus to provide a target in variable orientation relative to the main net.

Abstract: A multi-purpose ball expelling apparatus which can be used with repeated operations for the training of baseball fielders, batters and pitchers comprising in combination a special netted frame in which a ball can be thrown, collected and pass into a special ball expelling machine which can be adjusted to expell the ball as a grounder, pop-fly or straight pitch. An inverted U-shaped frame is in a generally vertical plane and has a net stretched tightly across it. A brace is connected to each side leg of the U. A rectangular frame is supported in a generally horizontal plane by the U-shaped frame and braces. A second net is also stretched tightly across the rectangular frame. The rectangular frame downward somewhat toward its front edge to direct a ball into the expelling machine. A third net is attached to the top of the U-shaped frame and hangs loosely down to the net on the rectangular frame. This third net has a rectangular opening which serves as a baseball pitching target.

Abstract: A ballistic mat assembly and installation method therefor employ a sheet of elastomeric material and a cellular foam substrate which are mounted to a rigid panel. The panel is mounted to an armor steel plate by driving fasteners through the elastomeric material and the substrate to secure the panel to the metal plate. Projectiles which strike the asssembly impact against the plate and projectile fragmentation is contained within the assembly.

Abstract: A bullet trap comprises a lid over a container body holding aggregated, randomly- or not-randomly-arranged swatches of one or more types of polyacrylamide fiber material or the like. The lid is penetrable by bullets and the aggregated swatches slow any bullets which penetrate the lid sufficiently to retain them in the container. The bullet trap is intended for use in a method of safely loading and unloading firearms in which the firearm is aimed at the trap during loading and unloading to trap any bullets accidentally discharged during loading and unloading.

Abstract: An anti-splatter screen safety apparatus in which a screen of rubber-like material adapted to self-closing when penetrated by bullets is secured to the front face of a deflector plate for a bullet trap and spaced forwardly of the front face to form a space between the screen and the plate. When penetrated by a bullet which then strikes the plate, the material of the screen immediately closes behind the bullet to block passage of the spent bullet, fragments and particulate. The space between the screen and the plate allows bullets to completely penetrate the screen and allows all spent bullets and all fragments and particulate from spent bullets to move through the space without restriction to a well of the bullet trap. The screen provides total protection against splattering of bullets, fragments and particulate, prevents ricochet of all spent bullets, and contains all spent bullets, fragments and particulate.

Abstract: A portable bullet trap device for catching bullets fired at the device comprising a box having a bottom, a top, and front, back, and opposing sides. The front has an opening for the passage of bullets fired at the device. A plurality of vertically oriented resilient panels are provided in the box aligned with the opening in the front. The panels are spaced from each other to form spaces between the central portions of the panels through which spent bullets can fall if they cannot penetrate the next successive panel. The panels may be provided as a replaceable cell having spacers between the marginal edges of the panels. Alternatively, the panels may be separately mounted in slots in the opposing sides of the box. A target means is provided to spread shots over the panels.

Abstract: A projectile backstop assembly for decelerating projectiles is disclosed as including a container filled with a liquid for decelerating a projectile, an inlet opening in said container, an elongated sheet of material sealing the inlet opening and a pressure applying frame for pressing the material against the inlet opening, and an advancing mechanism for advancing the elongated sheet of material and thereby replace the pierced part of the sheet with an adjacent unpierced part.

Abstract: A goal apparatus for a game which selectively traps incoming objects such as softballs, soccer balls, footballs, and other objects, propelled at the goal from any, direction around the perimeter of the goal, by individual suspended members, draped ropes or chains, or netting.

Abstract: A game of skill, played on a generally level playing surface having a firm base with a yieldable covering. A spherical ball is placed on a court area of the surface, and a series of toroidal rings are thrown, one at a time, from one or several standard throwing distances toward the ball in an attempt to encircle the ball with at least one ring, either by direct landing or by bouncing a ring over and around it, or by causing the ball to roll over and into a previously thrown ring. If the attempt causes a ring to rest directly against a ball or to lean on it, points are also awarded.

Abstract: An improved bullet trap effective to stop and retain bullets fired from a firearm and enabling the recovery of such bullets in a reuseable condition. The bullet trap includes an elongate tubular housing defining a chamber open at each end, and a pair of cover assemblies are provided which are releasably secured to the opposite end portions of the housing, the cover assemblies each including a membrane formed of a material easily penetrated by a bullet fired from a firearm. The chamber defined by the housing is loosely filled with a relatively low density filler material in the form of particles effective to stop and retain bullets fired therein without significant deformation of the bullets. The bullet trap also includes a basket incorporating an open mesh screen which enables removal of bullets from the trap without requiring removal of the filler material therefrom.

Abstract: Apparatus readily useful for setting up to play a plurality of water and yard or court games. The construction comprises a plurality of tubing sections, preferably made of polyvinylchloride. The parts can be glued together in large part so that only one or two pieces need to be changed out to set up for different games or sports. The tubing permits the use of water as the ballasting medium, which is readily available and disposable in most situations.

Abstract: This invention relates to a knocking-down septum comprising a steel shutter structure on the slats of which a granulated material rests. The granulated material may consist of granules of natural or synthetic rubber, also of recovery rubber and possibly of a self-extinguishing type of rubber, of dry sand, or of a mixture of sand and rubber or the like. This granulated material lies on the slats of the shutter structure in accordance with the shutter's natural angle of repose and is thereby retained by the shutter. When a bullet crosses the thickness of the granulated material the granulated material slows down the velocity of the bullet.

Abstract: A splatter resistant removable cover slips over a ballistic target for containing backsplatter. The cover is constructed from panels which form an envelope surrounding the target with one of the panels being spaced forwardly from the target face. A second panel engages the back portion of the target to removably secure the cover in fixed position with the target. A projectile which is directed at the target penetrates a panel which is formed of elastomeric material and strikes the target to form fragments which are generally initially contained within the cover.

Abstract: A multi-purpose sports apparatus has a frame which has spaced-apart support members adapted to rest upon a supporting surface, such as the ground, a net extending between the support members, and a backboard carrying a basketball goal hoop supported between the support members above the net, the backboard being adjustably rotatable horizontally between a vertical position and a horizontal position, whereby the basketball goal hoop can be positioned to extend horizontally or vertically.

Abstract: A ballistic projectile arrester having a regeneration and/or recovery system for the impact material, and which is particularly suitable for the recovery of projectiles fired by small arms or the like in indoor firing ranges or shooting galleries is disclosed. The projectiles are fired into a quantity of granular material which is preferably fireproof and capable of dissipating the kinetic energy of projectiles in a safe way. The granular material is supported so as to provide a sloping surface having a maximum thickness at the point of penetration of the projectiles into the granular materials. The mixture of materials and projectiles is kept circulating in such a manner that the projectiles absorbed by the granular materials can be removed and the granular materials can be continuously recycled back into the separator to replenish the materials which have been removed from the impact area.

Abstract: A rebounding net (16) is supported in a portable frame (19). The net (16) includes a rectangular forward end (18) which provides a ball entry/exit way of a certain area through which a ball can move. The net (16) further includes a rearward end (32) which provides a ball-rebounding surface, and the net's forward end is connected to its rearward end by converging sidewalls (24,26,28,30). The sidewalls (24,26,28,30) have a generally trapezoidal-like shape and the net's rearward end (32) has a generally rectangular shape. The net (16) is supported by the frame in such a manner that tension in the net can be adjusted to influence the net's ball rebounding or returning characteristics.

Abstract: A collapsible goal frame having a crossbar, four uprights, two rear crossmembers and four sidemembers. The crossbar is detachable from sockets on the front uprights and pulls apart into three members of equal length and uniform diameter held together by an elastic cord threaded through the members. Uprights and crossmembers consist of telescoping members which are held in extended position by spring buttons. Telescoping members are retracted to collapse the frame. Four hinges join the sidemembers to the rear crossmembers, so that after the telescoping members are retracted, sides fold parallel to rear crossmembers. Lower sidemembers are weighted to add stability.

Abstract: A firing range assembly includes a transportable container which encloses a firing range. The assembly further includes a ventilating system for ventilating the firing range. Each wall of the container is provided with a lining which functions to: (i) resist penetration by projectiles; and (ii) inhibit rebounding of projectiles.

Abstract: An indoor gun firing range enclosure having an air supply plenum disposed at the uprange end wall of the enclosure and at least one air exhaust plenum located proximate the bullet trap located proximate the downrange end wall of the enclosure. The ceiling of the enclosure uniformly slopes downwardly from the uprange wall in a direction toward the downrange end wall of the enclosure. In an advantageous embodiment of the indoor gun firing range enclosure the air supply plenum is disposed at the intersection of the ceiling and uprange end wall and is designed to emit one-third of the air at an angle of approximately 45.degree. to the vertical and the remaining two-third portion of air in a downwardly direction.

Abstract: A remote controlled target device comprises a housing with an open front face, side panels and back and bottom panels angled to deflect misses projectiles back into the rear portion of the housing. A pivot bar extending across the housing holds a plurality of targets which are attached so as to permit them to revolve to knock-down positions when hit. A return bar is controlled by a cord which extends to a remote location to effect resetting the targets.

Abstract: A bullet trap is provided comprising a succession of metal sheets slanted alternately forwardly and rearwardly and forming a succession of dihedrons with an angle at the apex less than 60.degree.. The metal sheets are joined together two by two at their front end and are close to each other two by two at their rear end, while being separated by a space forming a passage for the bullets. The upper metal sheets are extended rearwardly, beyond the passage, by a curved portion forming a deflector deflecting the bullets against the rear face of the lower metal sheets.

Abstract: An enclosed, substantially bulletproof shooting booth for an individual shooter has a front shooting opening communicating with the interior of an elongated, substantially bulletproof firing tube extending from the booth. The end of the firing tube remote from the shooting booth is closed by a bullet backstop which deflects bullets fired from the booth and collects them in a trough of liquid. The booth, tube and backstop are of double-wall construction with a bulletproofing and noise-suppressing layer of sand between inner and outer walls. Each of the booth, tube and backstop can be at least partially prefabricated at a remote location and transported to a desired range site where they are installed above ground so as to form a space-saving, quiet, enclosed shooting range for an individual shooter.

Abstract: Improved crack propagation resistant acrylic sheets are provided: These sheets are prepared by copolymerizing methyl methacrylate with minor amounts of lower alkyl (C.sub.2 -C.sub.4) methacrylates. One and one quarter inch thick sheets polymerized from a monomer mixture of about 88 weight percent methyl methacrylate and about 12 weight percent butyl methacrylate or from about 76 weight percent methyl methacrylate and about 24 weight percent ethyl methacrylate are useful as indoor and outdoor ballistic glazing materials.

Abstract: A dual chamber bullet trap has a housing divided into two chambers by an impact plate that extends rearwardly and downwardly from the front to the rear of the trap. In one embodiment the impact plate is fixedly sealed to the housing thus defining a lower-forward chamber below the plate partially filled with water for receiving bullets deflected off the plate, and a second water filled chamber above the plate for stopping bullets which penetrate the impact plate when it fails due to repeated bullet impacts. When the impact plate fails water drains from the upper chamber indicating failure of the impact plate. In a second embodiment the impact plate is hinged along its front edge to the top-front of the trap and is free to pivot upwardly upon bullet impact to help dissipate bullet energy. The upper chamber contains a fluid filled container behind the pivoting impact plate. When bullets penetrate the impact plate they pierce the container allowing water to drain therefrom to indicate impact plate failure.

Abstract: A target practice system including reusable cartridges for firearms and a bullet trap for stopping the flight of projectiles from the cartridges. The case of the cartridge is adapted to receive the projectile, or alternative standard cases may be used. The projectile has a cylindrical core of a diameter less than the rifling of the firearm and axially spaced-apart, outwardly opening channels extend circumferentially about the core. Endless resilient rings are inserted into the channels. A powder-receiving hole is provided in the rearward end of the projectile. When fired, the projectile rides on the resilient rings as it travels down the barrel of the firearm. The core does not come in contact with the barrel, and the resilient rings center the core in the barrel during travel down it for improved accuracy. A rocket-like effect is realized from the rearward discharge of gases liberated by combustion. Also, methods of loading the reusable cartridges are disclosed.

Abstract: A target back-stop behind a target area with lamellar rows of lamellae mounted at a distance from one another while the lamellae of a front row of lamellae form a predetermined angle .alpha..sub.1 with the normal of the target area, and while the lamellae of a rear row of lamellae form, in the opposite direction, a predetermined angle .alpha..sub.2 to the normal of the target area. A front end of one lamella of the rear row of lamellae borders on the rear end of one lamella of the front row of lamellae, so that channels will be formed that zigzag between the lamellae, and in which projectiles of widely varying caliber will shuttle to and fro and, in that way, will be braked.

Abstract: A multisport practice device for defining a target for and arresting the flight of a ball or other projectile includes a base supporting a pair of laterally spaced-apart upright posts carrying a net closing the space therebetween. Adjustable crossbar members carry eyelet screws for removably hanging the crossbars from vertically spaced-apart hook screws on the upright posts to define a variable-height target area.