US2110771A

US2110771A - Apparatus for storing and displaying maps

Info

Publication number: US2110771A
Application number: US146843A
Authority: US
Inventors: Myron D Mccauley
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-06-07
Filing date: 1937-06-07
Publication date: 1938-03-08
Anticipated expiration: 1955-03-08

Description

March, 1938. M. D. MccAULEY APPARATUS FOR STORINCTND DISPLAYING MAPS Filed June 7, 1937 4 Shee'cs-Sheel l |lllllllllllllll l I l l l 1 l l I l l l I l s l l I l l l l l 1 l l l l I l l l l l Il L :inventor Gttorneg w, UAHU, WCTURE Mar'ch 8, 1938. M. D. MCCAULEY APPARATUS Foa sToaING AND DISPLAYING MAPS Filed June 7, 1937 4 Sheets-Sheet 2 5 Search Rouw March 8, 1938. M. D. MccAuLEY APPARATUS FOR STORING AND DISPLAYING MAPS Filed June '7, 1937 4 Sheets-Sheet 3 :inventor E 771k: (22a/,54

40. CARD, PICUHE, AND

SlGN EXHBlTlNG,

March 8, 1938. M. D. MccAULEY 2,110,771

APPARATUS FOR sToRING AND DISPLAYING MAPS Filed June 7, 1937 4 Sheets-Sheet 4 :inventor 40. CARD, PlCTURE, ANU

SlGN EXl-llBlllNG,

Patented Mar. 8, 1938 UNITED STATES PATENT OFFICE APPARATUS Fon sToRING AND DISPLAY- ING MAPS 17 Claims.

I'he present invention relates to apparatus for storing maps and like display articles of roll form in a protective cabinet and for selectively unrollng the maps or display articles to extend them through an opening and above their storage compartment for the purpose of displaying the same to view. The apparatus is particularly designed for handling large maps, such as are used by municipalities, cities, governments, oil companies, public utilities, railroads, Steamship companie's, etc., and which ordinarily are of such great size and weight that moving them by hand is very diicult.

The primary object of the present invention is to provide a protective cabinet in which several roll maps or display articles may be stored or filed, the maps so stored or filed being protected from destruction by re, water, dust or grime.

Another object of the invention is to provide a ling or storage cabinet of the character above referred to with electrically powered apparatus for selectively moving the map rolls into a position adjacent an opening therein'whereby apparatus positioned above the same may be operated to unroll a selected map and extend it vertically so that it may be conveniently and closely inspected, and also for extending an unWound portion of the map in an angular position, similar to a drafting board position, where it may be inspected, checked, corrected or redesigned. As to this latter respect the member which is provided to normally close the opening through which an unwound map extends is adapted to be moved to an inclined position, similar to a drafting board position, so that work may be conveniently performed upon a portion of a map resting upon the same.

Another object of the present invention is to provide apparatus of the character above referred to embodying electrically powered means for rewinding an unrollcd map upon its respective drum and in combination therewith a friction brake for retarding reverse movement of the map unwinding means in order that the rewound map will be wound in a fairly tight condition on its drum. The means for unwinding the map from a selected drum comprises an electrically powered roller mounted above the housing in which the several map supporting drums are contained and depending from the drum are straps which are adapted to be hooked on to the selected map to unwind it from its drum and to extend it vertically above the housing', and in some cases to Wind the map upon the roller. During rewinding of the map upon its drum there is a tendency for (Cl. I0-30) the unwinding roller to overrun the winding drum and to prevent such a condition friction means acts to retard movement of the roller in an unwinding direction.

Another object of the invention is to provide controls for the means for selectively positioning the drums in their operative position, said controls being so constructed whereby the means is manually placed in operation and is automatically stopped. That is, in selecting a map drum the operator manually holds the control in an operative position, and upon releasing the same so that it falls to its inoperative position, the drum moving means continues to operate until the next drum is placed in its operative position, at which time it automatically stops.

Another object of the present invention is to provide means for indicating, visibly, the relative position of the map drums with respect to the operative position. This means co-operates especially with respect to the above mentioned controls inasmuch as the operator may release the manual control upon indication that the drum next to the one desired has passed the operative position so that the automatic control v/ill automatically stop the drum carrier with the selected drum in operative position.

Another object of the invention is to provide manual controls for the means for unwinding the maps from or rewinding the maps upon their drums, the controls including a foot operated friction clutch so that the operator may conveniently start and stop movement of a map when it is desired to inspect diierent portions thereof. In some cases the maps may be quite long, say fty or a hundred feet, and in view of this condition the controls for moving the maps are provided with means for varying their speed of movement. This means enables the longer maps to be rapidly unwound from or Wound upon their drums.

Another object of the present invention is to provide means for automatically stopping operation of the map unwinding means in order to prevent the maps from being torn from their drums With the above and other ends in View the invention is more fully disclosed with reference to the accompanying drawings, in which Figure 1 is a front elevation;

Fig. 2 is a vertical, transverse section;

Fig. 3 is a vertical section through the housing, illustrating the operating mechanism in elevation;

Fig. 4 is a view taken at right angles to Fig. 3;

Fig. 5 is a horizontal section, illustrating a part of the controls and the indicator in plan;

Fig. 6 is an enlarged fragmental plan of a control device; 1

Fig. '1 is an end elevation corresponding with Fig. 6;

Fig. 8 is a side elevation corresponding with Fig. 6;

Figs. 9 and 10 are sections taken on lines 9-9 and IU-I respectively, of Fig. 5;

Figs. 11 and 12 are sections illustrating safety controls for the map drums.

Fig. 13 is a fragmental perspective illustrating the map unwinding means;

Fig. 14 is a transverse section of the map unwinding roller, and

Fig. 15 is a fragmentary section of a detail.

Like characters of reference are employed throughout to designate corresponding parts.

rIhe numeral I designates the vertical end members of a cabinet, the end members being united at their upper ends by a cross structure 2 and having a storage housing 3 between the lower ends thereof. The storage housing 3 comprises a rear vertical wall 4, a front vertical wall 5 and a removable cover 6. The front and rear walls, the cover 6, and also the bottom 1 are insulated at 8 to render the housing waterproof. The front wall of the housing has an opening in which a fiat closure I 0 is supported by a hinge II. The closure I0 depends from the hinge II and has a roller I2 on its lowermost, horizontal edge. In one of its operative positions the roller I2 is supported in the position shown in Fig. 2 by full lines, and in another operative position the roller is supported in the position shown in broken lines in Fig. 2. In the broken line position illustrated the closure I0 is held in an inclined position by a collapsible supporting structure I3. The inclined position of the closure is hereinafter termed the drafting board position.

Also-,hingedly mounted in the opening 9 is a closure element I4, which is adapted to be moved to the position shown in broken lines (in Fig. 2) in order to permit access to the interior of the housing 3.

Mounted in the housing 3 is a movable support for a plurality of drums upon which maps or similar articles are wound. The support cornprises two, vertically spaced, rotatable shafts I5 and I6 with sets of sprockets |1 and I8, respectively, thereon. Endless chains |9 are trained over the sprockets on the respective shafts, the chains having special links 20 at regularly spaced intervals which constitute bearings for rotatably supporting drums 2|. The drums 2| have maps 22 Wound thereon. It is obvious that, by rotating one of the shafts I5 or I6, by a suitable power means, the chains I9 will carry the drums 2|- past the opening 9. The invention, as will hereinafter be described, provides means for so moving the chains I9 and means for controlling said moving means in order that any selected drum 2| may be placed in a, position where a map may be unwound therefrom and trained under the roller I2.

The means for moving the chains I9 comprises an electric motor 23, supported by a cross frame member 24 in one of the vertical end members I, and connected through a gear reduction mechanisrn contained in the housing 25 to the shaft I5. The motor 23 is of the reversible type and when operated in either direction causes movement of the chains I9.

The switch for controlling the motor 23 is of standard type and its details of construction are not, therefore, shown here. For an understanding of the invention, it is assumed that the switch generally designated 26 and shown as having a control shaft 21, functions when the shaft 21 is moved rotatively in one direction to operate the motor 23 in one direction, and when the switch is operated in a reverse direction, to operate the motor in a reverse direction. When the shaft 21 is in an intermediate position the switch is open and the motor 23 is inoperative.

The means for operating the switch 26 comprises a horizontal rod 28, co-axial with the shaft 21 and having a handle 29 disposed externally of the end member I whereby the rod may be manually rotated. On the inner end of the rod 28 is secured a head 30 having two parallel pins 3| slidably mounted therein. The ends of the pins 3| are inclined, as indicated at 32 in Fig. 6, and the pins are yieldably held with their inclined ends projected by coiled springs 33. Each pin 3| has a radial finger 34. Adjacent the head 30 is a bracket 35 carrying two cam surfaces 36,

and when the head 30 is rotated, by manually/25 rotating the rod 21, the fingers 34 on respective pins are adapted to engage respective cams 36. That is, if the head 30 is rotated clockwise, the nger on one pin engages the adjacent cam surface 36 and functions to retract that pin, and conversely, if the head 30 is rotated counterclockwise, the finger on the other pin engages the other cam 36 and retracts said other pin.

Secured on the switch shaft 21, adjacent the head 30, is a collar 31 having a radial arm 38 normally disposed between the ends 32 of the pins 3|. Therefore, when the head 39 is moved rotatively in one direction, one of the pins 3| carries the arm 38 and imparts rotation to the switch shaft 21 to operate the switch 26, whereas rotation of the head 30 in the other direction causes the other pin 3| to move the arm 38 in the other direction and causes rotative movement of the switch shaft 21 in the opposite direction. Movements of the shaft 21 in this manner operate the switch 26 to operate the motor 23 in opposite directions. With the radial arm 38 vertical, as shown in Figs. 6, '1 and 8, the switch is in a neutral position and the motor 33 is inoperative.

Mounted upon the collar 31 is a second radial arm 39, the latter arm being disposed diametrically opposite with respect to the arm 38. That is, the arm 38 in its normal position, extends vertically above the collar 31, and the arm 39, under the same conditions, extends vertically below the collar. Connected to the radial arm 39 is a depending link 4U having a pair of spaced collars 4| and 42 fixed thereon (see Figs. 2 and 4). A lever 43, mounted upon a rotatable shaft 44, has its swinging end normally held in yielding engagement with the collar 4I by a coiled spring which is sleeved on the link 4I! and supported by the collar 42. Also mounted upon the shaft 44 is a second lever 46 having a camlike head 41 adapted to be engaged by axially projecting elements 48, one of which is provided on each drum 22.

In the vertical end member I, adjacent the control handle 29, is provided an opening 49. Mounted behind this opening, and having indicia thereon adapted to be displayed through said opening, is a rotatable disk 50. The disk is connected to the driven shaft I5 by a chain 5| and sprockets 52 whereby it rotates in unison therewith. As the shaft I5 is rotated and the 40. CMO, P!

Tirrenia drums 22 are moved with the chains I9, the indicia on the disk 50 indicates which drum is in or which drums are near the operative position relative to the roller l2.

Each drum 22 has a friction disk 53a thereon, and when a selected drum is in the so-called operative position, mentioned above, the friction disk 53a thereon is in a position whereby it may be engaged by a driving disk 53. The driving disk 53 is rotated through gearing contained in the housing 54 by an electric motor 55. The electric motor is suspended by arms 56 which have a bearing 51 slidably mounted upon a trunnion shaft 58. A flexible arm 59 has .a roller |60 upon its upper end engaging a bearing surface .|6I on the arms 56 whereby swinging movement of the flexible arm 59 swings the motor 55 and housing 54 to move the disk 53 into contact with the properly positioned friction disk 53a. The two disks 53 and 53a are thus related with their axes of rotation at right angles and when the periphery of the disk 53 engages the face of the disk 53a it imparts rotation thereto.

With a drive mechanism of the character above described, that is, where the periphery of one disk engages the face of the other disk, the distance of such contact from the center of rotation determines the relative speed of vrotation between the two disks. In the present case, by sliding the bearing 51 on the trunnion shaft 58, the point of contact of the disk 53 on the disk 53a may be varied so that such contact takes place nearer or more remote from the center of the disk 53a. The proper relationship is maintained between the two disks 53 and 53a during such adjustment movement by a bracket |59, secured to the motor and housing 54, and having an elongate slot therein into which the projecting element 48 on the aligned drum 22 is adapted to engage, after the motor has been swung but a comparatively short distance upon its swinging support. y

The means for swinging the exible arm 59 to cause the above described swinging movement of the motor 55, or in other words, engagement of the clutch parts 53 and 53a, comprises a rotatable shaft 6| having a foot pedal 62 thereon. Slidably splined upon the shaft 6| is a dog-tooth clutch part 63 adapted to engage a similar clutch part 64 connected to the flexible arm 59 and providing a support therefor upon the shaft 6I. The splined clutch part 63 may be moved into or out of engagement with the clutch part 64 by a rocking lever 65 having a forked end 66 engaging a pin 61 on the clutch part 63.

Mounted for both sliding and rotary movement, adjacent the control rod 28, is a second control rod 68. Splined upon the control rod 68, and held against longitudinal movement by a bracket 69 attached to the vertical end member is a collar 10 having a parti-circumferential spiral groove 1|. A pin 12 on the upper end of the rocking lever 65 extends into the groove 1| so that rotation of the'collar rocks the lever. A handle |12 is mounted on the outer end of the rod 68 for manually rotating the same.

From the description immediately foregoing it becomes apparent that by rotating the rod 68 in the proper direction, the lever 65 will be rocked, and the clutch element 63 will be moved, from the inoperative position shown in Fig. 4, into engagement with the clutch element 64. Therofore, manually moving the foot pedal 62 rotates the shaft 6|, the

clutch parts

63 and 64, and swings the exible arm 59 whereby the clutch disk 53 engages the disk 53a. When the manual pressure is removed, gravity causes disengagement of the disks 53 and 53a.

The relative speed of the two clutch parts 53 and 53a.l is also controlled by the rod 68, and comprises a collar 13, fixed upon the rod 68, and having a radial pin 14. A vertical shaft 15 has a radial lever 16 thereon with a forked end 11, and the pin 14 is moved, upon rotation of the rod 68 toI engage the clutch disks 53 .and 53a, to engage the forked end of the lever 16. At its lower end, the vertical shaft 15 has a radially extending lever 18 with a forked end 19 engaging a pin 80 on the bearing 51. Upon the shaft 15 is .a torsion spring 8| which tends to rotate the shaft 15 to hold the bearing 51 in the position shown in Fig. 4, which is the low speed position. By manually pulling the rod 68 outwardly, rotation of the shaft 15 may be caused, and the lever 18 will shift the bearing 51 toward the left hand side of Fig. 4. This movement shifts the point of contact of the disk 53 with the disk 53a nearer to the center of the disk 53a. and increases the speed of rotation of the disk 53a.

Mounted in the cross structure 2 is a roll 82 having a friction disk 83 connected thereto'. Adjacent the end of the roll 82 is a trunnion shaft 84 having a bearing 85 slidably an-d rotatably mounted thereon and supporting the arms 86. A motor 81, gear housing 88 and .a friction disk 89, driven through gearing contained in the housing 88 by the motor 81, are pivotally supported upon the upper ends of the arms 86. A bracket 90 is connected to the gear housing and motor and has a. slot 9| through which the end of a projecting element 92 on the roll 82 extends.

To move the friction disk 89 into engagement with the friction disk 83, a exible arm 93 is mounted to swing upon a trunnion 94, there being an arm 95 at right angles to the flexible arm 93 and a roller 96 upon the upper end of the iiexible arm engaging a bearing surface 91 on the swinging arms 86. The right angular arm 95 is connected by a link 98 to a radial arm 99 on a clutch part on the shaft 6|. The clutch part |00 is adapted to be engaged by the splined clutch part 63 to connect the same whereby rotation of the shaft 6|, caused by manual pressure on the pedal 62, pulls the link 98 downwardly and rocks the flexible arm 93 and causes engagement of the

friction disks

83 and 89.

In order toY vary the relative speed of the friction disks 83 and 89 a lever |0| is provided upon a vertical shaft |03, coaxial with the vertical shaft 15, and has a forked end engaging a pin |02 whereby swinging movement of the lever |0|, resulting from rotative movement of the shaft |03, causes the motor 81 and housing 88 to shift axially of the trunnion 84, and the disk 89 to be moved nearer to the center of the disk 83. A spring (not shown) similar to spring 8|, normally holds the motor 81, the housing 88 and the friction disk 89 in the low speed position shown in Figs. 3 and 4. To rotate the vertical shaft |03 a lever |04 is mounted on its lower end and its forked end is adapted to be engaged by the pin 14 whereby sliding movement of the rod 13 will impart rotation thereto.

The springs which hold their respective friction disks in the low speed position have an additional function. Referring again to the bracket 59, it will be noted that it is provided with a projecting portion |08 which engages a brake shoe |01, supported by a swinging arm |08, so that the pressure exerted by the spring 8| forces the shoe UUl bil into engagement with the periphery of the disk 53a. As will hereinafter appear, the brake shoe I 01 also assists in positioning a selected drum 22 in the operative position. The bracket 90 has a similar projecting portion |09 acting upon the brake shoe H0 to force it into engagement with the periphery of the friction disk 83 under pressure of a torsion spring (not shown) similar to and functioning in the same manner as the spring 8|.

In co-axial alignment with the control rod 68 is a switch H|, the rod 68 having a sliding connection therewith as designated at H2. The switch is of standard type and functions upon rotation of the rod 68 and its operating shaft H3, through the connection H2, in one direction to set the motor 55 in operation, and in the other direction, to set the motor 81 in operation.

The roll 82 has a plurality of clrcumferentially extending grooves I I4 in which flexible straps I I 5 are mounted, one of such grooves and straps being shown in Fig. 13. At their free ends, the several straps are united by a hook member H6, and the roll 82 has a longitudinal groove |I1 for the reception of the hook member when the straps are completely wound in their respective grooves. Each map 21 has a hook member H8 attached thereto and adapted to be connected to the hook member H6 as shown in Fig. 13.

In each drum 2| is provided a screw I I9, the screw being received in a screw-threaded bore in one of their axial supporting members |20. The special link 20, which receives the axial drum supporting member |20, has a plate |2| secured thereto and supporting a pin I22 extending into a groove |23 in the screw H9. In the end member adjacent the axis of the drum 2|, which at this time is in the operative position, is a control switch |24 having an actuating plunger |25. As the drum 2| is rotated, as will hereinafter appear, the screw I9 is projected and finally engages the plunger |25 to actuate the switch |24. Actuation of the switch |24 controls a motor circuit which prevents further unwinding of the map 22 from the drum 2|.

In operating the above described device to display any selected map, the operator observes which number on the indicia bearing disk is displayed through the opening 49. As shown, the number is displayed, which means that drum member I is in the operative position. Supposing, for example, it is desired to display the map on the drum member 5. The operator manually moves the control handle 29 and actuates the switch 26 to operate the motor 23. The switch 28 is actuated by engagement of one of the pins 3| with the radial arm 38. Operation of the motor 23 moves the chains I9, and as the indicia 4 on the disk 50 passes the opening 49, the operator restores the handle 29 to its original position. When the rod 28 is rotated, say for example, clockwise in Fig. '1, the pin 3| at the left hand side of the radial arm 38 causes movement of the radial arm, whereas the pin 3| at the right hand side of the radial arm 38 is retracted by engagement of its finger 34 with the adjacent cam 3B. Therefore, when the rod 28 is restored to its original position, the radial arm is permitted to remain in the position to which it was moved, and the switch 26 remains closed.

When the radial arm 38 was moved angularly, the arm 39 moved therewith, pulled the link 40 upwardly, and the pressure of the spring 45 caused the

levers

43 and 46 to swing the cam head 41 into the path of movement of the projecting elements 48 on the drums 2|. While the radial arm 38 was held in its angular position, by the operator holding the handle 29, the

levers

43 and 46 were rocked each time a projecting element engaged the cam head 41, such rocking merely causing compression of the spring 45. When the handle 29 was released at the passage of the fourth drum indicia, engagement of the projecting element 48 on the fth drum with the cam head 41 oscillates the shaft 44 and swings the lever 43 to pull the link 40 downwardly, thereby restoring the

radial arms

38 and 39 and the switch 26 to their original positions. During this return movement the radial arm 38 strikes the inclined surface 32 on the above referred to right hand pin 3|, which was restored to its original position by its spring 34, and snaps to a position between the two pins 3|.

At this stage in the operation, the previously selected fth drum (according to the indicia on the disk 50,) will be placed in the operative position. The closure I4 is then swung to its open position so that access may be had to the said fth drum. The straps I I5 upon the roller 82 are pulled downwardly and their hook member H6 is connected to the hook member ||8 on the map rolled upon the previously positioned drum.

The operator then operates the handle |12 to move the rod 68 clockwise, thus actuating the switch to set the motor 81 in operation and to place the pin 14 in engagement with the forked end |05 of the lever |04. Rotation of the rod 88 also rotates the collar 10, and the pin 12 acting in the spiral groove 1|, rocks the lever 85 and moves the splined clutch element 63 into engagement with the clutch element |00. Thereupon the foot pedal 62 is depressed and rotation of the shaft 6 I, caused thereby, swings the lever 99, pulls the link 98 downwardly, rocks levers 95 and 93, and forces the friction disk 89 into engagement with the friction disk 83. The roller 82 is thus caused to rotate and the straps II 5, in being wound around the same in their respective grooves H1, unwind the map 22 and cause it to extend vertically in front of the cabinet as indicated in broken lines at A in Fig. 2. Continued rotation of the roller causes the map 22 to be wound: around the same.

The maps 22 are ordinarily quite long and in some cases it is desirable to move them rapidly until the portion which is to be inspected is exposed. The speed of movement of the map may be varied by pulling the rod 68 outwardly, in which case the pin 14, in engagement with the lever |04 as above described, rotates the shaft |03 and swings the lever |0| to shift the motor 81 etc., whereby the point of contact between the periphery of the friction disk 89 with the surface of the friction disk 83 is moved nearer the center of rotation of the latter. When such movement takes place the number of rotations of the disk 83 resulting from each rotation of the disk 89 is increased.

When the desired amount of the map has been displayed its movement may be stopped by releasing the foot pedal 62 or by restoring the handle |12 to its original position where it renders the switch |I| inoperative. In order to prevent the map from being completely unwound from its drum the screw I9 and the switch |24 function in the nature of a safety control, as above described.

In order to rewind the map upon the drum from which it was unwound, the handle I 12 is rotated counterclockwise and by rotating the rod 68 actuates the switch Ill to set the motor 55 in operation. This counterclockwise movement rotates the collar 10 and through means of the pin 'l2 and spiral groove 1| rocks the lever 65 to move the splined clutch element 63 into engagement with the clutch element 64. The pedal 62 is then depressed and through rotating the

clutch elements

63 and 64 swings the flexible lever 59 and causes engagement of the friction disk 53 with the friction disk 53a on the aligned drum. Rotation is thus imparted to the drum 22 and the map rewound thereupon.

Counterclockwise movement of the rod 68 places the pin 14 in engagement with the forked end 71 of the lever 16, and by pulling the rod 68 outwardly the shaft 'l5 is caused to rotate. Such rotation swings the lever 18 and shifts the bearing l to move the friction disk 53 nearer to the Acenter of the friction disk 53a. to vary the speed of operation of the drum.

Any of the several drums 2| may be selectively placed in the operative position in which they are aligned with the friction disk 43 and may be moved upwardly or downwardly by manipulation of the above described controls. They may also be supported in a drafting board position whereby work may be performed upon the same by placing the closure element I0 in the inclined position shown at B in Fig. 2. With the closure element l0 in the inclined position B, an idler roller lZ is dropped from the elevated position shown in full lines in Fig. 2 to the position shown in dotted lines. It may be held, by its own weight, in the broken line position, or any suitable securing means known to the art might be used to hold the idler roller in its lowered position.

Fig. 15 illustrates a slack take-up for the map which functions upon movement of the closure l0 when it is moved from the position shown in broken lines at B to the full line position shown in Fig. 2. With the roller 82 and the operative drum stationary, such movement of the closure tends to loosen the extended portion of the map. This slack is taken up by rotative movement of the roller 82 relative to its supporting shaft 82a caused by a torsion spring B2b. The roller 82 is free to rotate relative to its supporting shaft 82a, and is yieldably connected thereto by the spring 82h. As the roller is rotated to extend a map, as above described, the spring 82h is placed under tension by the tension on the map. As the map tension is released, by lowering the closure l0, the tension of the spring rotates the roller until the slack in the map is taken up.

Although a specific embodiment of the invention has been illustrated and described it will be understood that various changes may be made within the scope of the appended claims without departing from the spirit of the invention and such changes are contemplated.

What I claim is:-

1. In combination, a cabinet having a compartment for the reception of a plurality of rolls of displays, movable means in said compartment supporting said rolls, said compartment having an opening through which unwound portions of said displays may be extended for inspection, means adapted to be connected to a display positioned adjacent said opening to unwind it from its roll and to extend the unwound portion thereof for inspection above said compartment, means for moving said movable means to selectively place said rolls in the position adjacent said opening, and means for supporting an unwound portion of a display in a. drafting board position.

2. In apparatus of the character described, a plurality of drums having displays rolled thereon, movable means rotatably supporting said drums, a housing enclosing said drums and movable means and having an opening through which an unwound portion of a display may be extended for inspection when the drum bearing said unwound display is positioned adjacent said opening, said movable means being adapted upon movement thereof to selectively position said drums adjacent said opening, means above said housing for unwinding a selected display and for extending it for inspection above said housing, and means for rewinding an unwound display upon its drum, said means for unwinding said display comprising a roller having means wound about the same and adapted to be connected to a selected display whereby rotation thereof causes the unwinding display to be wound about the roller, and frictional means for retarding rotation of the roller while said unwinding display is being rewound about its drum.

3. In apparatus of the character described, a plurality of drums having displays rolled thereon, movable means rotatably supporting said drums, a housing enclosing said drums and movable means and having an opening through which an unwound portion of a display may be extended for inspection when the drum bearing said unwound display is positioned adjacent said opening, said movable means being adapted upon movement thereof to selectively position said drums adjacent said opening, means above said housing for unwinding a selected display and for extending it for inspection above said housing. means for rewinding an unwound display upon its drum, and means for supporting an unwound portion of a display in a drafting board position.

4. In apparatus of the character described, a housing having an opening therein, a rotatable support within said housing, a. plurality of display supporting drums rotatably mounted on said support and adapted to be positioned adjacent said opening by rotative movement of said support, means for rotating said support, a roller positioned above said housing in spaced relation thereto, means for rotating said roller, and connecting members depending from said roller and adapted to be connected to the display on a drum adjacent said opening whereby rotation of said roller unwinds the display from the drum and causes it to extend through said opening and upwardly above said housing.

5. Inl apparatus of the character described, a housing having an opening therein, a rotatable support Within said housing, a plurality of display supporting drums rotatably mounted on said support and adapted to be positioned adjacent said opening by rotative movement of said support, means for rotating said support, a

roller positioned above said housing in spaced relation thereto, means for rotating said roller, connecting members depending from said roller and adapted to be connected to the display on a drum adjacent said opening whereby rotation of said roller unwinds the display from the drum and causes it to extend through said opening and upwardly above said housing, and meansy for rotating a drum positioned adjacent said opening in a direction to rewind an unwound display thereon.

6. In apparatus of the character described, a housing having an opening therein, a rotatable support Within said housing, a plurality of display supporting drums rotatably mounted on said support and adapted to be positioned adjacent said opening by rotative movement of said support, means for rotating said support, a roller positioned above said housing in spaced relation thereto, means for rotating said roller, connecting members depending from said roller and adapted to be connected to the display on a drum adjacent said opening whereby rotation of said roller unwinds the display from the drum and causes it to extend through said opening and upwardly above said housing, means for rotating a drum positioned adjacent said opening in a direction to rewind an unwound display thereon, and friction means adapted to oppose rotation of said roller during rewinding of a display.

7. In apparatus of the character described, a housing having an opening therein, a rotatable support within said housing, a plurality of display supporting drums rotatably mounted on said support and adapted to be positioned adjacent said opening by rotative movement of said support, means for rotating said support, a roller positioned above said housing in spaced relation thereto, means for rotating said roller, connecting members depending from said roller and adapted to be connected to the display on a drum adjacent said opening whereby rotation of said roller unwinds the display from the drum and causes it to extend through said opening and upwardly above said housing, and means for supporting an unwound portion of a display in a drafting board position.

8. In apparatus of the character described, a housing, a plurality of rolls of displays, a movable wall in said housing adapted to be moved to provide an opening whereby a display roll positioned adjacent thereto may be unwound and extended through the opening for the purpose of inspection, means for supporting said plurality of rolls, means for moving said last named means to selectively position said rolls adjacent said opening, means for unwinding the display from a roll positioned adjacent said opening to extend the same above said housing, and means for rotating a roll positioned adjacent said opening in a direction to wind a distplay thereon.

9. In apparatus of the character described, a housing, a plurality of rolls of displays, a movable wall in said housing adapted to be moved to provide an opening whereby a display roll positioned adjacent thereto may be unwound and extended through the opening for the purpose of inspection, means for supporting said plurality of rolls, means for moving said last named means to selectively position said rolls adjacent said opening, means for unwinding the display from a roll positioned adjacent said opening to extend the same above said housing, means for rotating a roll positioned adjacent said opening in a direction to Wind a display thereon, and means for supporting said movable wall in an inclined position and for training an unwound portion of the display thereover.

10. In combination, a cabinet having a housing, a drum in said housing having a map wound therearound, a roller above said housing havingl means thereon adapted to be connected to the map on said drum whereby rotation of the roller unwinds the map from said drum, a motor adjacent said drum, a motor adjacent said roller, and independently operable clutch means between the drum and motor and the roller and motor respectively.

11. In combination, a cabinet having a housing, a drum in said housing having a map wound therearound, a roller above said housing having means thereon adapted to be connected to the map on said drum whereby rotation of the roller unwinds the map from said drum, a motor adjacent said drum, a motor adjacent said roller, independently operable clutch means between the drum and motor and the roller and motor respectively, and a single actuator adapted to be rendered operative to operate the different clutch means selectively.

12. In combination, a cabinet having a housing, a drum in said housing having a. map wound therearound, a roller above said housing having means thereon adapted to be connected to the map on said drum whereby rotation of the roller unwinds the map from said drum, a motor adjacent said drum, a motor adjacent said roller,

and a combined variable speed drive and clutch mechanism between the drum and motor and roller and motor respectively.

13. In combination, a cabinet having a housing, a drum in said housing having a map wound therearound, a roller above said housing having means thereon adapted to be connected to the map on said drum whereby rotation of the roller unwinds the map from said drum, a motor adjacent said drum, a motor adjacent said roller, and a combined variable speed drive and clutch mechanism between the drum and motor and roller and motor respectively, a single actuator for the variable speed drives and a single actuator for said clutch, said actuators being adapted to render said drives and clutches operative selectively.

14. In combination, a cabinet, having a compartment for the reception of a plurality of rolls of displays, movable means in said compartment supporting said rolls, said compartment having an opening through which unwound portions of said displays may be extended for inspection, means adapted to be connected to the end of a display positioned adjacent said opening to unwind it from its roll and to extend the unwound portion thereof above said compartment for inspection, means for moving said movable means to selectively place said rolls in the position adjacent said opening, and means for controlling the movement of said movable means, said last named means being manually operable to start movement of said movable means and automatically operable to stop such movement.

15. In combination, a cabinet having a compartment for the reception of a plurality of rolls of displays, movable means in said compartment supporting said rolls, said compartment having an opening through which unwound portions of said displays may be extended for inspection, means adapted to be connected to the end of a display positioned adjacent said opening to unwind it from its roll and to extend the unwound portion thereof above said compartment for inspection, means for moving said movable means to selectively place said rolls in the position adjacent said opening, means for controlling the movement of said movable means, said last named means being manually operable to start movement of said movable means and automatically operable to stop such movement, and means on said movable means for causing the automatic operation of said controlling means.

16. In combination, a cabinet having a compartment for the reception of a plurality of rolls of displays, movable means in said compartment 40. CARD, PICTURE, AND

ai EXHIBmNG,

supporting said rolls, said compartment having an opening through which unwound portions of said displays may be extended for inspection, means adapted to be connected to a display positioned adjacent said opening to unwind it from its roll and to extend the unwound portion thereof for inspection above said compartment, means for moving said movable means to selectively place said rolls in the position adjacent said opening, means in said compartment for rewinding an unrolled display, manual means for operating said movable means for positioning a selected display adjacent said opening and in an operative position with respect to said rewinding means, and automatic means for stopping said movable means when said selected roll is in said operative position.

17. In combination, a cabinet having a compartment for the reception of a plurality of rolls of displays, movable means in said compartment Search Room supporting said rolls, said compartment having an opening through which unwound portions of said displays may be extended for inspection, means adapted to be connected to a display positioned adjacent said opening to unwind it from its roll and to extend the unwound portion thereof for inspection above said compartment, means for moving said movable means to selectively place said rolls in the position adjacent said opening, means in said compartment for rewinding an unrolled display, manual means for operating said movable means for positioning a selected display adjacent said opening and in an operative position with respect to said rewindjng means, means for indicating the position of the selected roll with respect to said operative position, and automatic means for stopping said movable means when said selected roll is in said operative position.

MYRON D. MCCAULEY.