referring to fig1 a masking unit 10 of the invention is illustrated as installed in its operating position across the end of a pair of companion bowling lanes 12 and 14 respectively . typically , the lane pair share a common ball return ( not shown ) that runs between and beneath the two lanes . since it is common for bowlers on opposing teams to switch lanes between frames , the two lanes are treated as a unit in many ways , one of which is that they share a common masking panel 20 which bears a design that generally extends between the right end 21 and the left end 22 of the panel 20 . first and second ball lights 13 and 15 for lanes 12 and 14 are mounted to a bottom support element 25 for the masking panel 20 . each masking panel 20 is supported at ends 21 and 22 by stanchions 23 and 24 , respectively , in a manner disclosed below . since a bowling establishment typically includes many pairs of lanes , adjacent masking panels such as 31 and 32 to the right and left , respectively , of panel 20 will share stanchions 23 and 24 with masking unit 20 , as will be apparent from the following description of the supporting mechanisms . fig1 also illustrates an upper stepped panel assembly 50 including a series of vertical panels 51 - 54 ( see fig2 ) and means for supporting each panel in front , above and vertically overlapping the one behind . the purpose of these panels is to cover the area between the top of masking panel 20 and the ceiling and at the same time provide a sense of depth and provide means for adding a pleasing artistic touch to the decor of the establishment . the entire assembly of the masking unit 10 and the vertical panel assembly 50 is steadied by a lateral brace 56 that extends across the back and is attached to each vertical support 58 of the panel structure 50 . referring to fig2 the vertical support 23 is anchored to the foundation 16 of its associated bowling lane 14 by a metal horizontal base 17 which is attached by conventional means to a longitudinal stringer of the lane foundation 16 . the vertical support 23 is typically bolted to the base member 17 . a brace 18 is attached to the base member 17 and angles up to the vertical support 23 . slots 19 in the base member 17 permit fore and aft positioning of the vertical support 23 and brace 18 . a bracket 40 ( best illustrated in fig5 ) is attached to the top of the vertical support member 23 . wheeled carriages 60 attached to bracket 40 engage a track 70 attached to the panel 20 so that the panel 20 may be raised and lowered as described below . the track 70 is sized to accept and trap the carriages 60 therein in a closely fitting relationship , so that the panel 20 will glide smoothly up and down . a rotatable arm 29 is attached to support 23 approximately one foot below the bracket 40 . this arm engages the bottom support 25 for the panel 20 or the track 70 when the panel is in the raised position . its function is to prop the panel 20 in the raised position . the stepped panel assembly 50 includes a horizontal top support member 55 which extends forwardly of the vertical support 58 and the panel 20 and is attached to and supported by the vertical support 58 . the panels 51 - 54 are each held in position by frames 51a - 54a , each of which has an upper inverted u - shaped channel 57 and a lower u - shaped channel 59 sized to accept its respective panel . the upper channel 57 is deep enough to permit the upper edge of a panel to be placed therein and the panel lifted up over the front edge of and the lower channel 59 and then lowered thereinto for retention without coming out of the upper channel 57 . the panel may be taken out of the frame by lifting up and moving the lower edge forward of the frame . the frames 51a - 54a are attached to and held in place by vertical members 51b - 54b which are attached to the horizontal top support member 55 by conventional means . the members 51b - 54b vary in length so as to position the panels 51 - 54 in stepped overlapping arrangement , as viewed from the head of the lane , between the top of the panel 20 when in the down position and the ceiling ( not shown ). the entire panel assembly 50 remains clear of the area above the vertically moving panel 20 so that the panel 20 may be raised to the full extent permitted by the support mechanism . fig3 is a front view of stanchion 23 and the various elements of the invention attached thereto that support adjacent masking panels 20 and 31 for vertical movement . the assembly 100 attached to the right side of stanchion 23 interacts with the track 70 on the left end 33 of the masking panel 31 and the assembly 101 attached to the left side of stanchion 23 interacts with the track 70 on the right end 21 of a masking panel 20 , as explained below . as the panels 20 , 31 and 32 are mechanically identical , fig3 is representative of the mechanisms that support the opposite ends of each one , i . e . assembly 100 supports the left end of each panel and assembly 101 supports the right end of each panel . ( note : the directions &# 34 ; left &# 34 ; and &# 34 ; right &# 34 ; used in this specification are as seen from the head of the bowling lanes .) referring to fig3 and 5 , the right assembly 100 includes a mounting bracket 40 which is bolted to stanchion 23 and has upper and lower tabs 41 and 42 , respectively , which extend outwardly at 90 degrees from the stanchion 23 . upper and lower wheeled carriages 61 and 62 , respectively , are bolted to the front faces of tabs 41 and 42 . a flange bearing assembly 80 is bolted to bracket 40 between the carriages 61 and 62 . the bearing 80 supports a plain bearing 81 within which rides a shaft 91 which is attached to the left end of a tube 90 . the tube 90 is a rigid tube that extends between adjacent stanchions such as 23 and 24 . its left end is illustrated in assembly 100 and its right end in assembly 101 . a shaft 92 attached to the right end of tube 90 rides within a plain bearing 82 held by a bearing retainer 80 attached to a bracket 40 on the left side of stanchion 23 . an identical sprocket wheel 83 is fixedly attached to each of the shafts 91 and 92 , which are in turn fixedly attached to their respective ends of the tube 90 , so that the tube 90 and sprocket wheels 83 rotate in unison . the sprocket wheels 83 engage chains 75 attached to each end of the panels as explained below , so that one end does not move up or down faster than the other and alignment of assembly is maintained . locking collars 86 and associated set screws 87 serve to axially position the shafts 91 and 92 and their attached sprocket wheels 83 in alignment with their associated chains 75 on the back of the panel 20 . the tube 90 may have a torque applied thereto to aid in lifting its associated panel 20 . for this purpose a coil spring 94 is disposed around the tube 90 . the end of the spring 95 adjacent to stanchion 23 engages a bracket 96 bolted to bracket 40 in a manner that enables the spring 94 to be torqued about the tube 90 . the other end 97 of spring 94 is locked to the tube 90 after torquing by a collar 98 which receives the internal end 97 of the spring 94 and is in turn pinned to the tube by locking pins 99 . once the panel 20 is engaged with the sprocket wheels 83 , the spring 94 may be torqued to the desired degree . fig4 illustrates the track and chain assemblies 102 and 103 attached to the back of masking panels 20 and 31 , and which interact with assemblies 100 and 101 , respectively , of fig3 . the right - hand side of each panel 20 , 30 or 31 has a track and chain assembly identical to 103 and the left - hand side has a track and chain assembly identical to 102 . each of the moving masking panels 20 , 31 and 32 is mounted on a rectangular metal frame 30 comprised of the bottom 25 , a top 26 , a left side member 27 and a right side member 28 . each of the side members 27 and 28 of the frame 30 has a track 70 attached by the back thereof extending from top to bottom of the frame . a motion control chain 75 is positioned adjacent to the inside edge 71 of each track 70 . the upper end of the chain 75 is attached to the track 70 by an upper chain anchor 76 . a bolt 77 passes through the upper anchor 76 and the upper end of the track 70 . a connecting link of chain connects the chain to the anchor . referring to fig4 a and 7 , the lower end of the chain 75 is attached to the side of the track 70 by means of an adjustable anchor mechanism 110 which includes an elongated base 111 , an up - turned end 112 and upturned side ears 113 . a threaded chain attaching finger 114 passes through a hole 115 in the upturned end 112 of the anchor 110 and is retained in the desired position by lock nuts 118 threaded thereon in opposite sides of the upturned portion 112 of the anchor 110 . the outer end 116 of the finger 114 has a bore 117 therethrough sized to accept a linking pin of the chain 75 . by adjustment of the nuts 118 , tension on the chain may be adjusted . it is desirable to keep the chain taught to maintain positive contact between the chain 75 and the sprocket wheel 83 . the finger 114 has a moderate &# 34 ; s &# 34 ; curve therein so as to hold the chain close to its supporting side frame member 26 or 27 . the lower chain anchor 78 is attached to the track 70 by a bolt 79 which passes through the ears 113 and the lower end of the track 70 . the attaching bolts 77 and 79 prevent the track 70 from sliding off of the carriages 60 . referring to fig5 and 6 , each carriage 60 has a body 65 to which the wheels 63 are attached in a manner known to the art . the body 65 is attached to the carriage base 64 by an arm 66 which is securely attached to the base 64 . the base 64 is bolted to one of the tabs 41 or 42 of the bracket 40 . carriages suitable for this purpose are those used in sliding door assemblies and may be purchased over the counter . for example , l . e . johnson products , inc ., 2100 sterling avenue , elkhart , ind . is a manufacturer and sells carriages suitable for this purpose and specified in their literature as a hanger no . 1020 . the track 70 is also manufactured by this company and is designated by part no . 111 - 0048 , particularly for use with their part no . 1020 . the flange bearing assembly 80 is attached to the bracket 40 and is positioned so that when the shaft 91 is assembled therein , the sprocket wheel 83 will engage the chain 75 on the back of the panel 20 . a plane bearing 81 is held by the bearing housing 80 in a conventional manner and the housing 80 is attached to the bracket 40 by bolts 84 . referring to fig6 the track 70 is an extruded aluminum piece having a cross - sectional shape configured to accept through an open end and support therein the carriages 60 . the clearance between sides of the wheels 63 of the carriage 60 and the inside side walls 72 of the track , and the clearance between the wheels 63 and the inside front 73 and back 74 of the track 70 should be sufficient to permit easy movement of the carriage within the track , yet maintain the alignment of the attached chain 75 with sprocket wheel 83 . this clearance permits the wheels 63 to engage either the front 73 or the back 74 of the track 70 and thus rotate without binding when the masking panel 20 is raised or lowered . upon assembly of a moving panel 20 to its supporting elements , its track and chain assemblies 102 and 103 illustrated in fig4 will engage with carriage and sprocket assemblies such as 100 and 101 , respectively , illustrated in fig3 . an upper 61 and a lower 62 carriage will be engaged within a track 70 and the spokes of the sprocket wheel 83 will be aligned with and engaged upon the chain 75 positioned adjacent the track 70 . once assembled , the chain retaining bolts 77 and 79 prevent the panel 20 from sliding free of the carriage 61 or 62 . fig9 and 9a illustrates the support assembly for vertical panels 52 shown in fig1 and 10 , and is representative of each of the supports for the panels 51 - 54 . the support has an arm 53b which may be attached to the horizontal support member 55 by any conventional means . attached at the lower end of arm 53b , are top horizontal member 46 and a bottom horizontal member 47 , each extending approximately 8 to 10 inches on either side of the arm 53b . the bottom horizontal member 47 has its lower edge turned up to form a channel 47a therealong having a depth of approximately 1 / 2 inch . the top horizontal member 46 has its upper edge turned down to form a channel 46a therealong having a depth of 1 inch . on such support is provided for each end of the panels 51 - 54 . the deeper upper channel 46a permits the panel to be inserted therein and lifted high enough to permit the lower edge of the panel to clear the upper lip of the channel 47a . when lowered into channel 47a , the panel 53 must be high enough so that its top edge remains within channel 46a . the panel 53 may be removed by reversing the insertion process . the horizontal support members 55 and attached support arms 51b - 54b for the stepped panel array 50 are located between each lane pair , and the frame elements 46 and 47 suspended therefrom extend to each side of the horizontal support member 55 , so as to provide support for the ends of two adjacent vertical panels extending to opposite sides of the support arm 55 and across adjacent lane pairs . fig1 illustrates the vertical stepped panel assembly 50 of the invention with the panels 51 - 54 installed within their supporting frames 51a - 54a . each of the panels overlaps the one behind sufficiently to prevent the top edge of the panel behind from being visible to a bowler standing at the head of the lane or seated in the bowler seating provided . this arrangement reduces the amount of panel material required to a minimum . at the outer sides of the first and last lanes , the frame elements 46 and 47 of the frames 51a - 54a may be removed or adjusted in length to hold a panel extending to the nearby wall , or otherwise adjusted to accommodate a partial panel length . it is contemplated that panels 51 - 54 will be decorated to provide a pleasing effect and to enhance the sense of depth provided by the assembly 50 . fig8 illustrates an embodiment of the invention which has not yet been built and tested but is believed to be the best embodiment of the invention envisioned to date . in this embodiment , the carnages 260 are attached to the back faces 243 of the wings 241 of the bracket 240 and so extend aft therefrom toward the sprocket wheel 283 . the tracks 270 are attached to the vertical side frame members 28 and 27 of the masking panels 20 and 31 respectively by u - shaped brackets 200 which are attached to and extend the length of their respective side arms 28 and 27 of their frames 30 . the u - shaped bracket 200 is oriented so that it opens to the outer edge of the panel 20 . the forward arm 201 of the u - shaped bracket 200 is attached to the side frame member 21 , while the track 270 is attached to the inside of the back arm 202 of the bracket 200 . the track 270 is laterally positioned on the arm 202 so as to engage the carriages 261 and a companion lower carriage ( not shown ) as described above . a chain 275 is attached to the back side of the arm 202 , with its longitudinal axis parallel to and in fore - and - aft alignment with the longitudinal axis of the track 270 . upper and lower chain anchors are attached to the back arm 202 of the u - shaped bracket 200 and the chain 275 is tensioned between these two anchors . sprocket wheels 283 and attached shafts 291 , similar in function to wheel 83 and shaft 91 described above , are positioned within flange bearings 280 so that the sprocket wheels 283 and their teeth maintain pressure contact with the chain 275 . the extent of the said pressure may be adjusted by changing the tension of the chain , as earlier described . the remainder of the support assembly , e . g . the connecting tube 90 , spring 94 and spring anchor brackets 96 and 98 , remain essentially the same as illustrated in fig3 - 5 and described above . the principal advantage of this embodiment of the invention is that the controlling action of the chain and sprocket wheel assembly is more positive , due primarily to the fore and aft alignment of each track , its attached chain 75 and sprocket wheel assembly . it will be understood that the invention may be embodied in other specific forms without departing from the spirit or central characteristics thereof . the present examples and embodiments , therefor , are to be considered as illustrative and not restrictive , and the invention is not to be limited to the details given herein .
a masking unit for bowling lanes equipped with automatic pinsetters , comprising a vertically moving masking panel and a series of stepped panels in front of the moving panel and extending from the top thereof to the ceiling of the bowling establishment . stanchions at each end of a panel hold wheeled carriages which engage tracks on the back of the moving panel so that the panel may be vertically raised and lowered . chain driven control means assures that one end of the panel does not get ahead of the other when the panel is being moved , and spring biasing means aid in raising the panel .