US2585859A - Turntable for paper roll stands - Google Patents

Description

Feb. 12, 1952 w, SHOWALTER 2,585,859

TURNTABLE FOR PAPER ROLL STANDS Filed Oct. 14, 1947 5 Sheets-Sheet 1 INVENTOR. [FAY/V6 l L /mn flz rae 1952 F. w. SHOWALTER 2,585,859

TURNTABLE FOR PAPER ROLL STANDS I Filed 001:. 14, 1947 v 5 sheets-shed? IN VEN TOR. fk/i/VK W 5/0/4492 x5e Feb. 12, 1952 F. w. SHOWALTER TURNTABLE FOR PAPER ROLL STANDS 5 Sheets-Shae 5 Filed 001;. 14, 1947 e 5 E .a. 0 5 l 0 W; 5 n 5 c m5 W\ W l W k M Z 5 Y 3 0 w r a 0 Q W 5 5 1 O 1 w 0 1 .2 3 u a B m k E w 2 4 a 3 4 H 1952 F. w. SHOWALTER 2, 9

TURNTABLE FOR PAPER ROLL STANDS Filed Oct. 14, 1947 5 Sheets-Sheet 5 77 a; as,

mmvrox. Fran/z h! .fwmqzrz-ze [Iraq/vy- Patented Feb. 12, 1952 UNITED PATENT. OFFICE j E 2,585,359 F V PAPER ROLL STANDS- Frank wf s howauer', west Carrollton, Ohio, as-

signp1.,.t0 The; American Envelope Company, West Carrollton Ohio, a corporation of Ohio Application Octobe'rl l, 1947,'Seria1No. 779,753

11 Claims (01. 242-64)' This invention relates to a turntable for paper roll stands.

' Asis well known paper comes from the paper making machine in the -form'oi 'a continuous web which is wound into rolls-for handling and storage. When the paper is'to be used'or shipped in the form of sheets the webs 'areied'from the rolls to a cutting machine which severs'the same into sheets or sections of: the-desired length.

It is desirable that the webs be simultaneously withdrawn from a plurality ofrolls and fed to the cutting machine is superposed- "relation sothat each cutting operation will sever sheets from all the webs. For this purpose a plurality Iof rolls may be rotatably supportedbn' the respective stands of a series of roll standsso arranged that the web from each succeeding roll willrextend lengthwise of and will'be superposed on the web from the next preceding roll, and the several superposed webs fed to the "cutting machines: A

roll of paper of normal size isvery heavy. and

considerable time is required 'fo'r 'mounting the same on a stand. Consequently: when the .webs have been completely Withdrawn from a series of rolls a relatively long time is requiredto-mount other rolls on those stands and during this time the cutting machine is idle. and productionceases.

One object of the invention is to. provide means "A further object of the .invention isto provide a'rotatable structure having thereontwo series. of roll stands so arranged that, apartial rotation;

of the structure'will move. the stands of'one series from delivery position to loading position and at the same .time move'thestandsof the other series from loading. positionwto delivery.

A further object of the invention is to providesuch a rotatable structure having power 'operposition.

ated means for moving the: structure to: a predetermined position'and means for. looking. the

same in said position.

a locking device for such a rotatable structure including a locking member on saidstructure, a

second locking member supported independently of: said structure'andmeans for indicating to an webs there A further object of the invention is to provide operator the relative positions of said locking members.

A iurther object of the invention is to provide such a rotatable structure with means for interrupting the movement thereof when it moves beyond locking position.

I A' further object of the invention is to provide each stand with simple and eihcient means for supporting a roll thereon and for adjusting the roll with relation thereto.

Other objects of the invention may appear as the mechanism is described in detail.

In the accompanying drawings Fig. 1 is a top plan view, partly in section, of an apparatus embodying the invention; Fig. 2 is an enlarged section taken on the line 2--2 of Fig. 1; Fig. 3 is a section taken on the line 3-3 of Fig. 1, partly broken away; Fig. 4 is a detail view of one of the rotating devices; Fig. 5 is a plan view of an adjustable arbor supporting device, or saddle;

Fig.6 is a side elevation of the device of Fig. 5;

Fig. 7 is a section taken on the line l'! of Fig. 5; Fig. 8 is a side elevation of a non-adjustable ar-borsupporting device; Fig. 9 is a section taken on the line 99 of Fig. 8; Fig. 10 is a section on line Ill-I0 of Fig. 11, with the power unit in elevation and partly broken away; Fig. 11 is a top plan view of the locking device; Fig. 12 is a section on the line l2--I2 of Fig. 11; Fig. 13 is ,a side elevation of one roller mounting; Fig. 14 is an axial section taken through a roller mounting and the roller driving element; and Fig. 15 is a circuit diagram of the control mechanism.

In these drawings I have illustrated one embodiment of my invention and have shown the *same in a form designed primarily for supporting two series of paper roll stands and for moving said series alternately into and out of alinement with a paper cutting machine, but it is to be understood that the mechanism as a whole, as well as the several parts thereof, may take various forms and may be used for various purposes without departing from the spirit of the invention.

In the illustrated embodiment the invention comprises a turntable including a frame 20 mounted for movement about a vertical axis 2l.'

The frame may take various forms and is here shown as comprising two pairs of beams 22 and 23 connected one with the other by other beams or bars 24. The frame is provided at its center with a vertical socket 25 which receives and is rotatably supported on a pivot pin 2! which is rigidly mounted on the base structure or floor 26. Preferably boards or sheet material are placed on the beams 24 to form a floor between adjacent beams 22 and 23. The frame is supported for rotation about its vertical axis by a plurality of series of rollers, there being in the present instance three concentric annular series of rollers 21, each including four rollers, which travel on corresponding series" of annular tracks 28. In the arrangement shown each roller is mounted in a mounting or bracket 29 rigidly secured to and depending from one of the beams,

22and23. 7

Mounted on the frame are 'two' parallel'series of paper roll stands arranged on. the respective sides of the vertical axis 2 l, theitwo. seriesbeing here designated as A and B. Each stand ofeach .22.. or 23. The roll supporting devices on the higher stands are so arranged that each upper roll will be supported above the two adjacent series comprises two upright 7 standards, the

standards of series A being mounted respectively on the two beams 22 and the standards-of series B being mounted respectively on the two beams 23. Adj cent stands. oi bo h series rep eierably of difierent heights, and the outer and... inner tandar s of-each hi her, st nd are desi nate repectively as 3.9 and. Shandthe outerand inner standards of e ch lower stand ar designated. respectively as a and 31m. Th standards of. ach stand, both hishand low. are provideda their upper, ends with. saddles.:..o.r supportin bea n forthe. arhors...32..of the paper rolls. The saddle for one standard; of. each stand. in. the present instancethe outenstandardtfl or 30a, comprises a..base;.33. mounted on the upper end of the standard and havinga suideway. extending lengthwise. of.the.arbor 3 2. slidably, mounted in the .guideway isa. supporting member 34. which may be-adjustedby ascrew 35. rotatably mounted-on the base 33-, having at its Quterend a hand wheel. andv having on its innor threaded portion a uttlwhich is arranged between lugs..38. dependingfrom the supporting; member 34 so as to cause: thatmember to move.

' with thenut. .The supporting. member 34. is.

provided in its upper: portion withv a guideway 39 extending transversely/to the arbor, 32. and. slidably mounted in. this guideway is a block In. which is adjusted by a screw M rotatably mounted on and held against axial movement with relation to. the block ML andv having, on. its threaded portion. a nut 42 arrangedbetween lugs. 43 on the supporting. member. 34. theblock M! for rotation about. a vertical. axis is a bearing block 44. having in the uppersurface thereof anopenhearing recess 45 to receive and. support one end portion of the arbor 32. Mounted. on e b aringblook .44. s by. means ofa stu 46, is a flexible member. such. as a metallic strap 41, which extends forwardly fromthe stud and.

then upwardly and rearwardly above the bearing recess 45 and is apertured to receiveanscrew threaded stud 48 on which is mounted a. nutv 59;

by which the strap 41 may be secured in posl tion above the arbor in the bearing, recess, to. retain the latter in the recess.

Mounted on the other standard, 3| 017,311 of each stand is a base 50 on which is mounted, a bearing member 5| having therein a bearing recess 52 to receive the adjacent end portion of the arbor 32. Pivotally mounted on the bearing, member on one side of the recess is an 21111153 adapted to extend forwardly above an arbor in the bearing recess and having pivotallymounted thereon a latch member 54 movable into-and out of engagement with a lug or keeper 55, on the bearing block 5|. The. bearing member 51 is. preferably mounted on the base 50 for movement Mounted .on

rolls onthe lower stands with its axis in a vertical plane between said lower rolls, thus enone to the other so that a large number of rolls 1 may be mounted in a relatively small space, there being in the present instance twelve rolls in each series of rolls. With the rolls so arrangedthe web from the foremost upper roll willbe withdrawn from the tape! the roll lengthwise of, th series. the web from. the. foremost lower roll will bewithdrawn. upwardly aboutthe foremost. upper rolland superposed onithe web, from the first on- Dev roll, the web. fromthe second upper roll will be. withdrawn from thetop thereof abovethe two Preceding rolls. and. so on; until the webs from the twelve rolls are superposed one upon the other. and move in true parallelism to the point at. which. they are tobe. operated upon. The severing mechanism is:.usually, a cutting machine having feeding meansfpr moving thesuperposed webs. between the cutting. elements, and it is in-. dicated diagrammatically. at 51. so supported on the stands of series A, in Fig. 1. that the webs will be withdrawn therefrom in a forward direction toward the-severing mechanism, asshown in Fig. 2. In reloading the stands of series. Bthe. rolls are somounted thereon that the webs. extend therefrom in a direction opposite the direction in which they are being withdrawn from'the rolls'oi. series A. the. supporting structure. is rotated to move the stands of series. B into line with the severing mechanism the webs will be withdrawn from the rolls. onsaid stands toward the severing mechanism.

5 Rotary movement may be imparted to the frame 20-, to reverse-the positions of the two series of stands, in any. suitable manner. Preferably apart ofthe rollers which support the frame are motor driven. In the present arrangement each of the four rollers- 21 which travel on the outer-- most annular. track 28" is provided with a driving element, such as a sprocket wheel 58, which is.'shown in Fig. 14. as rigidly secured to the shaft 59 on which the. roller is mounted; This driving element is 'operatively connected with a reversible electric motor 60 mounted on the frame 20. and, in'the. present. instance, the sprocket wheel 58fis connected .by a sprocket chain 6| with aspr'ocket wheel 62 secured to. a shaft 63 which is driven by the motor 60 through conventional;

gearing. nothereshown- The operationof these motors is manuallycontrolled by an operator as will bahereinafter described and means are pro vided for-locking the rotatable frame in either of two positions, that is in a position in which either the stands of series A or the stands of series B willbe in a, position to deliver the webs to the cutting mechanism. For this purpose a locking deviceis provided. comprising a locking membersecuredtothe rotatable frame and a second look- The rolls are.

Thus when 5.. ing member mounted on a fix'ed' support adjacent the frame for movement into and out oflocking engagement of the locking member on the frame. Preferably two such locking devices are arranged at the opposite sides of the frame. As shown in Fig. l the two locking members 64 are rigidly secured to the frame in diametrically opposite positions and are preferably in the natureof sockets. Mounted on the supporting base 26 adjacent the locking positions of the respective locking members-6 3 are bolts 65 and 65a, each bolt being adapted to enter and thus have locking engagement with either of the locking members 64 which is moved into line therewith. The locking bolts 65 and 65a are preferably power operated and each is here shown as mounted in a guide member 66 which is rigidly secured to a, base plate 61. Also mounted on the base plate '61 is a fluidcylinder I58 having therein a piston 69, which is connected by a piston rod with the bolt, and

of informing theoperator as to the relative positions of the locking members 64 and 65 there is provided at the control station an indicating device which is controlled by the rotary movement of the frame 28 and is connected with the controls for the motor circuits.

- Electric current is supplied to the motor 69 through apower line 4 and this power line is provided with magnetically operated switches to control the operation of the motors and the direction of rotation of the frame. These switches are shown diagrammaticallyat I5 and I6 and are connected in a control circuit IL-18; Manually operated switches I9 and 80 in the control circuit'separately energize the two power line switches and I6; Also connected in the power circuit are the devices for indicating the relative positions of the locking members. In the present instance separate indicating devices are provided for the two locking devices. The conductor I8 of the control circuit leads from the source of current, such as 110 volt service line, to a normally closed microswitch 8I having an actuating member 82 by which it may be opened. A conductor 83 leads from the normally closed switch 8| to a second normally closed microswitch 84 which has an actuating member 85. A conductor 86 leads from the switch 84 to a normallyclosed microswitch 8'! having an actuating'member' 88.

A conductor 89 leads from the switch 81 to a lamp 90 which in the present instance is designated as a green lamp and which is connected with the conductor T1 of the control circuit. The conductor 86 is also connected with a two way microswitch 9| the terminal 92 of which is connected by a conductor 93 with a second lamp 94 also connected with the conductor 11 and here indicated as a red lamp. The terminal 95 of the switch SM is connected by a conductor 96 with one side of.

a normally closed microswitch 98 which is con nected by a conductor 99 with a second g'reen; The conductor 91 is also connected light I00. with a two way microswitch I 0| having an actuating device I02. The terminal I03 of thesw-itch- IOI is connected by a conductor I 04 with a second red lamp I05. The second terminal I06 of the 6. switch IN is connected by: a conductor I01 with oneside of the manually operated control switch 80, the other side of which is connected with the power line switch'l fi. Switches 8'! and 9| are controlled by a switch actuating device carried by the rotatable frame.. The actuating members 88 and 9Ia are spaced apart a short distance vertically and the actuating device is in the nature of a wedge-shaped element I08 adapted to enter the space between these actuating devices to actuate one or both of the switches 81 and 9| 'depending upon the continued movement of the frame. The actuating devices 98a and I02 for the switches 98 and IOI are similarly arranged and are actuated by a switch actuating device IlIBa'. The present control mechanism contemplates that the turntable shall rotate alternately in opposite directions through the same half circle to move each series of stands alternately into loading position and into feeding position. Thus the turntable moves first in one direction, which for convenience may be termed the forward direction, to position a given series of stands in line with the cutting mechanism and "is then moved in the reverse'direction to move that-se ries of stands into loading position. Consequent- 1y it is desirable that both the actuating devices I08 and 1&1 should be located at the same side of the turntable and they are here shown as formed-in one piece, the tapered ends of the two devices extending in opposite directions. In Fig. 12 the actuating device I08 is shown in full lines in contact with the actuating device 88 of switch 81 and the actuating device mm is shown indotted lines in contact with the actuating device 98a. of switch 98, on that side of the turntable opposite switch 81. The microswitches BI and 84 are biased toward circuit opening positions and the actuating members 82 and thereof are .arranged to be engaged by the bolts 65 and 65a when these bolts are in their retracted positions, thus maintaining these switches in circuit closing positions so long as the respective bolts are in their retracted positions.

When the turntable is to be rotated in a forward direction the operator closes control switch I9 to actuate a power line switch 15 and thus close the circuits through the motor in a direction to rotate the turntable forwardly and this control switch 'l9 is retained closed until the turntable has completed its movement in that direction. The locking bolts 65 and 65a being then in their retracted positions, switches 8| and 84 are closed and current in the control circuit will flow from supply line 18 throughswitch 8I, wire 83, switch 84, wire 86, normally closed switch 8?, wire 89, green lamp to the returnline 11, thus illuminating the green lamp 90. At the same time current-will flow from the switch 84 through wire 97, switch 9s and green lamp I00 to the return line TI, thus illuminating both of the green lamps. As the locking sockets 64 closely approach alinement with the locking bolts 65 and 65a the actuating device I08 will open switch 8! and thus extinguish the green, lamp 90 indicating that thebolt 65 is in a position to enter the locking socket. The operator then releasesthe control switch 19 and stops the motor and then actuates the control valve 12 to energize the hydraulic devices 68 and move both bolts into locking relation to their respective sockets. The movement of the bolts to' locking positions opens the switches 8| and '84 and thus extinguishes the" green lamp I00 as well as the green lamp 90; Both green lamps being'dark theoperatorzknows that the turntableis locked. It: is not essential that the turntable should be stopped with the sockets in exact alinement with the respective bolts because the tapered ends f the bolts will permit the same to enter the sockets and the force exerted upon the bolts will impart to the turntable any movement necessary to bring the sockets into exact alinement withthe bolts. However, should the operator fail to open the circuit promptly the continued movement of the turntable would; carry the sockets slightly beyond locking, relation to the bolts and when this happens the further movement of the actuating device I08 will close normally open switch SI and current will flow through wire 93, red lamp 94', to the return line 11, thustilluminating the red lamp and notifying the operator that the locking devices are notin alinement. He then closes control switch 80' to energize power line switch I6 and reverse the direction of operation of the motor and of the turntable. The actuating device I08 is thus retracted and releases switch 9I and permits the same to open. Thus both the green lamp 951 and the red lamp 94 are dark and the operator knows that the locking devices are in alinement and operates the controlling valve to move the bolts to locking positions, and this movement of the bolts opens switches 8| and 84 and extinguishes all the lamps.

When the turntable is to be rotated from its locked position in a reverse direction all lamps are dark and the operator knows that the turntable is locked and that he must actuate his control valve [2 to release the table before energizing the motors. retracted he closes the control switch 80 and energizes the power line switch 16 to cause the turntable to be rotated in a reverse direction. The closing of control switch 80 closes the circuit through the switches 8!, 84, 98, wire 99, and green lamp I00, to the return line 11. At the same time thecurrent flows as above described through switch a'l and green lamp 90 so that both green lamps are illuminated. The operation is then the same as above described and as the bolts appreach locking positions the actuating device I08a will open switch 98 to darken green lamp I00 and the operator releases the control switch. If the locking devices move beyond locking positions the circuit is closed through switch IOI,

wire I 01, and red lamp I05 to return line I1, thus illuminating red lamp I05 andnotifying the operator that the locking devices are out of alinement and he proceeds to restore the same as before.

-It will be noted that the green lamps 90. and I00 are connected in the control circuit independently of the control switches I9 and 80. Consequently if the bolts 65 and 65a are in their retracted positions and the master switch, not shown, in the control line is closed the green lamps will be illuminated to inform the operator that the turntable is unlocked and that the motors may be energized. The extinction of either green lamp notifies the operator that the.

While I have shown and described one embodiment of my invention,.I wish it to be understood that I do not desireto be limited to the details When the bolts have been thereof: as various modifications personskilled in the art.

Having now fully described my invention what I, desire to secure by Letters Patent is:

1. A turntable for paper roll stands comprising a horizontal frame mounted for rotation about a vertical axis, rollers supporting said frame for movement about said axis, two substantially parallel series of roll stands mounted on said frame on opposite sides of said axis, each stand having means for supporting a roll of paper for movement about a horizontal axis, the several roll supporting means of each series of stands being so arranged that the webs of paper may be withdrawn from the rolls on said series of stands lengthwise of said series of stands and in superposed relation one to the other. and means for imparting rotary movement to said frame.

2. A-turntable for paper roll stands comprising a horizontal frame mounted for rotation about a vertical axis, rollers supporting said frame for movement about said axis, two substantially parallel series or" roll stands mounted on saidframe on opposite sides of said axis, each stand having means for supporting a roll of paper for movement about a horizontal axis, the several roll supporting means of each series of may occur to 8.

stands beingso arranged that the webs of paper.

may be withdrawn from the rolls on said series of stands lengthwise of said series of stands and in superposed relation one to the other, means for adjusting said rolls with relation to their respective stands to cause said webs to move in. paths having a predetermined relation one to the other, and means for imparting rotary movement to said frame.

3. A turntable for paper roll stands comprising a horizontal frame mounted for rotation about a vertical axis, rollers supporting said frame for movement about said axis, two substantially parallel series of roll stands mounted on said frame onopposite sides of said axis, each stand including a. pair of laterally spaced upright standards, bearings carried by the standards of each pair of stands to receive the respective end portions of an arbor for a roll of paper, alternate stands of each series of stands being. of different heights and the several stands of each series being spaced one from the other distances less than the initial diameter of one of said rolls of paper, whereby each roll on the higher stands is supported with its axis above and in a vertical plane between the adjacent rolls on the lower stands, and the webs may be simultaneously withdrawn from all rolls on said series of stands in superposed relation one to the other.

4. A turntable for paper roll stands comprising a horizontal frame mounted for rotation about a vertical axis, rollers supporting said frame for movement about said axis, two substantially parallel series of roll stands moimted on said frameon opposite sides of said axis, each stand having means for supporting a roll of paper for movementabout a. horizontal axis, the severalv roll supporting means of each series of stands being so arranged that the webs of paper may be withdrawn from the rolls on said series of stands lengthwise of said series .of stands and in superposed relation one to the other,.power operated means on said frame for imparting rotary movement thereto, and means for controlling the movement of, said frame by said power operating means.

5. A turntablefor paper roll stands comprising a horizontal frame mounted for movement about a vertical axis, a plurality of annular tracks 'below said frame and concentric with the axis thereof, a corresponding plurality of series of rollers having supporting connection with said frame and movable on the respective tracks, two straight line series of roll stands mounted' o'n said frame -*onopposite sides 1 of said axis, each s'tand having-means for-supporting a roll of paper formdvement about its-longitudinal axisj't he roll supporting means of each series of stands being so arrangedthat the webs of paper may be simultaneously withdrawn from the rolls on said series of stands lengthwise of said series and in superposed relation one to the other, a plurality of motors mounted on said frame and having driving connection with the respective rollers of one series of rollers, and controlling means for said motors supported independently of said frame.

6. A turntable for paper roll stands comprising a horizontal frame mounted for rotation about a vertical axis, rollers supporting said frame for movement about said axis, two substantially parallel series of roller stands mounted on said frame on opposite sides of said axis, each stand having means for supporting a roll of paper for movement about a horizontal axis, the several roll supporting means of each series of stands being so arranged that the webs of paper may be withdrawn from the rolls on said series of stands lengthwise of said series of stands and in superposed relation one to the other, power operated means on said frame for imparting rotary movement thereto, a locking member on said frame, a second locking member movable into and out of locking relation to the first mentioned locking member, a control station, and means-at said control station to control the movement of said frame by said power means and to cause said second locking member to move into locking relation to said first mentioned locking member.

7. A turntable for paper roll stands comprising a horizontal frame mounted for rotation about a vertical axis, rollers supporting said frame for movement about said axis, two substantially parallel series of roll stands mounted on said frame on opposite sides of said axis, each stand having means for supporting a roll of paper for movement about a horizontal axis, the several roll supporting means of each series of stands being so arranged that the webs of paper may be withdrawn from the rolls on said series of stands lengthwise of said series of stands and in superposed relation one to the other, a motor on said frame drivingly connected with one of said rollers to rotate said frame, means for energizing said motor, a locking member on said frame, a second locking member mounted on a fixed support adjacent said frame, an actuating device for said second locking member, and means controlled by the movement of said frame to indicate the relative positions of said locking element. 7 v

8. A turntable for paper roll stands comprising a horizontal frame mounted for rotation about a vertical axis, rollers supporting said frame for movement about said axis, two substantially parallel series of roll stands mounted on said frame on opposite sides of said axis, each stand having means for supporting a roll of paper for movement about a horizontal axis, the several roll supporting means of each series of stands being so arranged that the webs of paper may be withdrawn from the rolls on said series of stands lengthwise of said series of stands "and" in-'-'su'perpo's 2d relation" one-to the other, a motor'on said frame drivingly connected with one of'sa'id rollers to rotate" said frame, means for energizing said motor; a: locking member carriedb'y saidframa a second locking member "movablysupportedadjacent said frame, a power operated -fdevice "to move said second locking member into engagement with the locking memher off said frame, a control station adjacent said' frame, and meaiis -at-saidstation to energize respectiv ly said motorand said power operated-devicet- 9. A turntable for paper roll stands comprising a horizontal frame mounted for rotation about a vertical axis, rollers supporting said frame for movement about said axis, two substantially parallel series of roll stands mounted on said frame on opposite sides of said axis, each stand having means for supporting a roll of paper for movement about a horizontal axis, the several roll supporting means of each series of stands being so arranged that the webs of paper may be withdrawn from the rolls on said series of stands lengthwise of said series of stands and in superposed relation one to the other, a motor on said frame drivingly connected with one of said rollers to rotate said frame, means for energizing said motor, a locking member carried by said frame, a second locking member movably supported adjacent said frame, a power operated device to move said second locking member into engagement with the locking member on said frame, a control station adjacent said frame, means at said station to energize respectively said motor and said power operated device, and a device located at said station and controlled by the movement of said frame to indicate the position of the locking member on said frame with relation to said second locking member.

10. In a device of the character described, a structure mounted for rotation about a fixed axis, means for locking said structure in a predetermined position including a locking member on said structure and a second locking member mounted independently of said structure, means including a motor for rotating said structure and accurately locating the locking member thereon in a position to be engaged by said second locking member, an indicating device comprising two electric lamps of different colors, a normally closed switch in circuit with one of said lamps, a normally open switch in circuit with the other of said lamps, and switch actuating means carried by said rotatable structure to open the first mentioned switch as the locking member on said structure moves into locking position and to close the last mentioned switch as said locking member moves beyond locking position.

11. In a device of the character described, a structure mounted for rotation about a fixed axis, means for locking said structure in a predetermined position including a locking member on said structure and a second locking member mounted independently of said structure, means including an electric motor for rotating said structure and accurately locating the locking member thereon in a position to be engaged by said second locking member, a manually operable switch to control the operation of said motor, an indicating device comprising two lamps, a normally closed switch in circuit with one of said lamps, a two way switch in circuit with the other of said lamps and with said motor controlling switch and normally in open circuit s,

position with relation to said lamp, switch actu- REFERENCES CITED Ming means carried by Said rotatable structure The following references are of record in the to open said normally closed switch when the file of this Patent:

locking member on said structure moves into 5 locking position and to actuate the last men- UNITED STATES PATENTS tioned switch to close the circuit through the Number I Y Name Date second lamp and to open the circuit through 1,078,8 1 Koch Nov. 18, 1913 said motor controlling switch when said lock- 1, 94,248 Smith i Aug. 8, 1916 ing member moves beyond locking position. 1. 1,506,327 Perrault Aug. 26, 1924 2,218,352 Fischer Oct. 15, 1940 FRANK W. SHOWALTER. 2,346,903 Cafirey Apr. 18, 1944

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