US977500A - Apparatus for handling hanging scenery. - Google Patents

Apparatus for handling hanging scenery. Download PDF

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US977500A
US977500A US1910562791A US977500A US 977500 A US977500 A US 977500A US 1910562791 A US1910562791 A US 1910562791A US 977500 A US977500 A US 977500A
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Prior art keywords
drum
drums
shaft
shafts
members
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Seth G Bailey
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Martin Beck
Andrew C Carson
Seth G Bailey
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    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63JDEVICES FOR THEATRES, CIRCUSES, OR THE LIKE; CONJURING APPLIANCES OR THE LIKE
    • A63J1/00Stage arrangements
    • A63J1/02Scenery; Curtains; Other decorations; Means for moving same
    • A63J1/028Means for moving hanging scenery

Description

' s. G. BAILEY.

APPARATUS FOR HANDLING HANGING SOENERY.

APPLIGATION FILED MAY 21, 1910. 977,500. Patented Dec. 6,1910.

4 SHEETS-*SHBET 1.

S. G. BAILEY.

APPARATUS FOR HANDLING HANGING SGENERY.

' APP-LIOATION FILED MAY 21. 1910.

977,500. Patented Dec; 6, 1910.

4 snnm'ssnu r 2.

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APPARATUS FOR HANDLING HANGING SOENERY. APPLIOATION FIL'ED MAY 21. 1910.

977,500, Patented Dec.6,1910.

4 SHEETSSHEET 3.

S. G. BAILEY. APPARATUS FOR HANDLING HANGING SOENERY.

APPLIOATION FILED MAY 21. 1910.

Patented M06, 1910.

4 SHEETS-SHEET 4.

' UNITED STATES PATENT FIG.

SETH G. BAILEY, OF DENVER, COLORADO, ASSIGNOR OF ONE-FOURTH '10 MARTIN BECK, OF NEW YORK, N. Y., AND ONE-FOURTH TO ANDREW C. CARSON, 0F DENVER.

COLORADO.

APPARATUS FOR HANDLING HANGING SCENERY.

Patented Dec. 6, 1910.

Application filed May 21, 1910. Serial No. 582,791.

To all whom it may concern:

Be it known that I, SETH G. BAILEY, a citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Apparatus for Handling Hanging Scenery; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in apparatus for handling hanging scenery in theaters or wherever mechanism of this kind is required, my object being to facilitate the manipulation of the curtains or flies whereby the entire work which originally required a great many men, may all be accomplished by a single person.

\Vhile my improved apparatus is more especially intended for the handling of hanging scenery in theaters, it must be understood that it may be employed in handling loads of any character and the term scenic member may be considered a generic expression meaning the curtain or fly of the theater or other load which it may be desired to handle.

In my improved construction provision is also made for simultaneously dropping all of the curtains or flies upon the stage when for any reason, as in the case of fire, it might become necessary or advisable to do so. It is evident that if a fire should occur on the stage, the dropping of all of the curtains, flies or hanging members, would smother the fire and prevent its spreading.

In my present apparatus I employ a single unit for each curtain or fly, each unit consisting of two drums loosely mounted upon shafts rotating in opposite directions. In connection with each drum I employ a shiftably or slidably mounted clutch member! having pins in constant engagement with the adjacent drums. lVhen properly adjusted, these pins interlock with members connected with the rotating shafts, whereby the drums are correspondingly rotated.

In the specific construction shown in the drawing the two drums of each unit are located one directly above the other and the two shafts upon which the drums are loosely mounted are rotated through the instrumentality of a worm interposed between two worm wheels one of which is fast upon each shaft. Levers are employed for shifting the clutch members, each lever being cen trally fulcrumed so that when the handle extremity of the lever is shifted in one direction to its limit of movement, one clutch member will be disengaged from its cooperating member mounted on the shaft while the other clutch member will be thrown into engagement with its cooperating member mounted on the other shaft. In this way the rotation of the drum is reversed for the purpose of lifting or dropping the curtains or flies, as may be desired.

Provision is made for automatically actuating the lever connected with each unit, for stopping the movement of the curtain or fly when traveling in either direction. This is accomplished by placing actuating cones or balls upon the cables connected with the curtains, flies or scenic members. When the curtain has been raised, for instance to its limit of movement or to the desired height, the downwardly moving cone upon the cable acts upon the lever, forming a part of the corresponding unit, and shifts the lever sufliciently to disconnectthe clutch members which are in engagement, but not suflicient to interlock the clutch members of the oppositely located drum of the unit. Hence, this automatic movement of the lever leaves both drums disconnected from their shafts for purposes of rotation and consequently the drums are no longer positively actuated and in this event band brakes engaging a brakewheel member connected with the lower drum serves to lock the loose drums against movement in response to the weight of the corresponding scenic member. Each of these controlling levers, is provided at its lower extremity with a cam member which acts upon one arm of a lever connected with the band-brake of the lower drum, and this cam acts upon the band-brake lever, to release the brake when the lever is shifted to either extreme position. This movement of the lever, however, is always manually accomplished, the, automatic action serving only tofirijovethe' lever sufficiently to disengage the cooperating clutch members associ- 65 a ring having a relatively narrow periphery 1 engaged ated with one drum, but not serving to interlock the corresponding clutch members associated with the other drum. Each brake lever is provided at its extremity remote from that engaged by the controlling lever, with a weight of sufficient mass to normally cause the brake-band to lock the lower drum of its unit against rotary movement, and as the lower drum is locked, the upper drum of the unit is also looked, since the two drums must rotate in unison.

Having briefly outlined my improved construction, I will proceed to describe the same in detail, reference being made to the accompanying drawing, in which is illustrated an embodiment thereof.

In this drawing: Figure 1 is a View chiefly in elevation, illustrating my improved apparatus shown in connection with a single scenic member. Fig. 2 is a view partly in elevation and partly in section, on a larger scale, illustrating a series of units, some of which are shown in central section, while others are in elevation, the manipulating levers being shown in both extreme positions as well as in the intermediate position. This is a combination view made for the purpose of illustrating the various positions of the elements constituting the apparatus when in use, a sufficient number of units being illustrated to accomplish this object. Fig. 3 is an end elevation of the apparatus, being a view looking in the direction of arrow 3, Fig. 2. Fig. 4 is a section taken approximately on the line 45, Fig. 2, looking toward the left. Fig. 5 is a section taken on the same line looking toward the right. Fig. 6 is a fragmentary view showing the lower portions of a number of levers, illustrating the various positions of any lever in its relation with the band-brake lever. Fig. 7 is an elevation of a rock-arm operating in unison with each clutch operating lever, for shifting the male members of the clutches upon their respective shafts.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate a motor, and 6 the operating shaft which is equipped with a worm 7 engaging two worm-wheels 8- and 9 between which the worm is interposed. These worm-wheels are respectively fast on shafts 10 and 12, located one above the other. Upon each shaft is located and made fast a series of sleeves, those on the shaft 10 being designated 13 and those on the shaft 12 being designated 14. These sleeves are made fast to their respective shafts by set-bolts 15. Each sleeve of each shaft is provided with a female clutch member 16 which preferably consists of a disk having a number of perforations 17 adapted to receive pins 18 with which the corresponding male member 19 is equipped, the latter consisting of 20, which is engaged from opposite sides by lugs 21 formed on a lever 22. The periphery of this ring of each unit of the apparatus is also engaged from opposite sides by lugs 23, one pair of lugs being located at the upper extremity and the other at the lower extremity of a rock-arm 24 which is fast upon a shaft 25 to which both the rock-arm and the lever of each unit are secured. The body portion of the shaft 25 is angular, preferably square, in cross section, to fit collars 26 and 27 with which the lever and rock-arm are respectively provided. The said arm and lever are prevented .from longitudinal movement upon the shaft 25 by set-bolts 28, the said shaft being journaled in boxes 29 and 30 carried by a suitable framework 31 which may be of any suitable construction.

Loosely mounted upon the respective sleeves 13 and 14, are upper and lower drums 32 and 33, the upper drum having two grooves 34 and 35, the groove 34 being adapted to receive the convolutions of a cable 36 connected with a block 37 carrying a number of pulleys 38, 39 and 40, the said pulleys being engaged by cables 41, 42 and 43 which are connected with the scenic member 44 at points 45, 46 and 47. As shown in the drawing three ropes or cables are employed for each scenic member, these cables engaging guide pulleys 48, 49, 50 and 51. The extremities of these cables 41, 42 and 43 extend downwardly and are connected with the pin-rail 52 for trimming purposes. By loosening these cables from the pin-rail, the scenic member may be trimmed or adjusted to occupy the proper position during its rising and falling movement and after this is accomplished the cables may be secured to the pin-rail and no further adjustment will be required. From this it will be understood that the pulleys 38, 39 and 40 carried by the pulley block 37 engage the cables 41, 42 and 43 intermediate their ex; tremities, the said cables having a running contact with the pulleys of the said block. Since one extremity of each of the cables connected with the scenic member is made fast to the pin-rail, the upward and downward movement of the pulley-block imparts a corresponding movement to the scenic member. The other groove of each drum 32, is adapted to receive an operating cable 53 which is connected with a groove 54 of the drum 33. This last named drum also has a groove 55 which is engaged by a bandbrake 56, the said brake being connected at one extremity as shown at 57, with a stationary bracket 58 while its other extremity is connected as shown at 59 with a lever 60 fulcrumed at 61 and equipped at one extremity with a weight 62 and at its opposite extremity with a foot-plate 63. The arm of this lever where the foot-plate is located, is by a cam 64 formed on the lower extremity of the lever 22, the central portion of the cam being grooved or recessed as shown at 65, while on opposite sides of this groove the cam is provided with clownwardly projecting parts 66, so that when the lever is shifted to either of the extreme positions heretofore explained, the foot-plate extremity of the lever will be depressed to release the brake-band and allow the drum 33 to rotate freely.

Each of the drums 32- and 33 of each unit is provided with perforations 67 adapted to receive the pins 18 of the clutch members 19, whereby the drums and said clutch members are always connected in operative relation. In fact the drums form the support for the male clutch members 19 by virtue of the engagement of the pins with the drums.

Each lever 22 is provided at its upper extremity with a handle 68 for convenience of manipulation. There are three possible positions of this lever and they will be referred to as position A, position B, and position C, the three positions being illustrated in Fig. 6 of the drawing and also in Fig. 2.

The position A of the lever may be termed its normal position, its body portion, as illustrated in the drawing, being then exactly vertical, whereby the pins 18 of the clutch members 19, associated with both drums 32 and 33, are disengaged from their cotiperating clutch members 16. In this event the band-brake is in the normal position whereby its weight 62 serves to lock the drum 33 against movement.

Now if it is desired to raise the scenic member 44, the lever 22 of the unit with which the cable 36 of this particular scenic member is connected, is shifted to the position B (see Fig. 6, and also the unit farthest to the right, and the unit third from the right in Fig. 2). This movement of the lever shifts the lower clutch member 19 of the unit whereby its pins 18 are caused to enter the perforations of the clutch member 19, whereby the drum 33 is connected in operative relation with the shaft 12. It will be understood that both shafts 10 and 12 are assumed to be in motion under the influence of the worm 7 acting on the gears 8 and 9, whereby the said shafts are caused to rotate in reverse directions. Hence, as soon as the clutch members 19 and 16, associted with the drum 33, are interlocked, this drum begins to rotate in the direction of the arrows a in Figs. 1, 3, 4 and 5. This move ment of the drum 33, winds the cable 53 from the drum 32 onto the drum 33, whereby the drum 32 is rotated in a direction to wind the cable 36 thereon, thus moving the pulley-block 37 downwardly and lifting the scenic member 44, as will be readily understood by an inspection of Fig. 1.

lVhen the scenic member has reached a predetermined upward limit of movement (see dotted lines in Fig. 1), an actuating cone 69 fast on the cable 36 passes between a roller 70 mounted on a stationary member 71, and a roller 72 mounted on the upper arm of the lever 22 and shifts the lever from the position B to the position A, thus disengaging the clutch member 19 from its cooperating clutch member 16 associated with the lower drum 33 of the unit. This movement of the lever 22 is just suflicient to dis engage these clutch members associated with the lower drum but not enough to interlock the corresoonding clutch members of the upper drum. Hence, as soon as the cone 69 acts upon the lever 22, both drums will cease to move, since the band-brake 56 is locked upon the drum 33, the position A of the lever 22 allowing the brake-lever to as sume its normal position. In this event it may be assumed that both shafts 10 and 12, together with the clutch member 16 are continuing their movement.

Now, assuming that it becomes necessary to drop a scenic member, the lever 22 of the unit with which the cable 36 of this particular scenic member is connected, will be manually thrown to the position C, whereby the pins 18 of the clutch member 19 associated with the drum 32, are caused to enter the perforations 17 of the corresponding clutch member 16,'whereby the drum 32 is caused to rotate in the direction indicated by arrows 0 in Figs. 1, 3, 1 and 5, thus winding the cable 53 from the drum 33, upon the drum 32, and unwinding the cable 36 from the drum 32 by virtue of the weight of the scenic member acting on the cable 36. W hen this scenic member has reached a predetermined downward limit of movement, an actuating cone 73 fast on the cable 36 will engage a pivoted dog 74 and throw the lever 22 to the position A by virtue of the engagement of the pivoted dog with a roller 7 5 mounted on the lever. This dog 74 is bifurcated to receive the cable 36. Hence, as soon as the lever 22 reaches its normal position, being the position A, as heretofore described, the clutch members associated with the drum 32 will be disconnected, and the brake-band 56 will serve to lock both drums against movement. It will thus be seen that after the manual shifting of the lever 22, whereby the clutch members associated with either drum 32 or 33 of any unit are caused to interlock, the scenic member will rise or fall, as the case may be, to a predetermined limit, in which event the interlocked clutch members will be automatically disconnected, and the band-brake released, whereby both drums of the particular unit in question are locked against movement.

As heretofore explained, it may be necessary or desirable to drop all of the scenic members simultaneously upon the stage, as

in the case of fire, for the purpose of smothering the fire and preventing a serious confiagration. In order to accomplish this object, I employ a single lever arm 76 fast on a rock-shaft 77 extending underneath the weighted arm of each brake-lever 60. Upon this rock-shaft is mounted a series of cams 78 corresponding in number with all of the brake levers and respectively positioned directly beneath the said levers whereby as the lever arm is sufficiently moved, the said cams will simultaneously lift the weighted arms of all of the brake levers, whereby the bandbrakes of all of the drums 33 will be completely released, thus allowing both drums of each unit to rotate freely upon and independently of their respective shafts, in response to the weight of the various scenic members, whereby all of said members will drop in a mass upon the stage.

If it should happen that any scenic men ber of any unit is moving upwardly during this emergency operation of the lever 76, this member will continue its upward movement until the cone 73 of the corresponding cable 36 shall act upon the dog 7% to shift the corresponding lever 22 and disengage the clutch members associated with the corresponding drum 32; and as soon as this occurs, this particular scenic member will also fall automatically upon the stage, since the brake-lever of this particular unit cannot assume the locking position.

In order to further support the clutch members 19 upon the drums 82 and 33, each drum is provided with pins 79 rigidly secured thereto and adapted to enter openings 80 formed in interiorlv projecting lugs 81 with which the clutch members are provided.

Attention is called to the fact that in Fig. 2 the dogs 74, as well as the rollers which are mounted on the stationary frame plates 71 are shaded by the use of parallel horizontal lines. This SAtICllDQf of the rollers 70 is intended to clearly distinguish these rollers from the rollers 72 and 75 which are carried by the levers.

In order to reduce the wear upon the lower cam-shaped ertreinity (36 of each lever 22, the brake lever is provided with an antifrictional roller 82.

Having thus described my invention, what I claim is:

1. The combination with a load, of two shafts, means for rotating the shafts in reverse directions, drums normally loose on the respective shafts, a cable connecting the load with one drum, another cable connecting the two drums, and means for connecting either drum to rotate with its shaft while the other drum is loose on its shaft.

2. The combination with a load, of two cooperating shafts, drums normally loose on the respective shafts, a cable connecting one drum with the load, a second cable connecting the two drums, means for connecting either drum to rotate with its shaft while the other drum is loose on the other shaft.

3. The combination with a load, of two shafts, means for rotating the shafts in reverse directions, drums n rmally loose on the shafts, a cable connecting one drum with the load, a second cable connecting the two drums, means for manually connecting either drum to rotate with its shaft while the other drum is loose on the other shaft, and means for automatically disconnecting the said drum from the shaft.

l. The combination with a load, of two cot perating shafts, means for rotating the shafts in reverse directions, drums normally loose on the respective shafts, a flexible device connecting one drum with the load, a second flexible device connecting the two drums, and a lever for connecting either drum to rotate with its shaft while the other drum is loose on the other shaft.

5. The combination with a load, of two cooperating shafts, means for rotating the shafts in reverse directions, drums normally loose on the respective shafts, a flexible device connecting one druin with the load, a Second flexible device connecting the two drums, and manually operated means for connecting either drum to rotate with its shaft while the other drum is loose on the other shaft.

6. The combination with a load, of two cooperating shafts, means for rotating said shafts in reverse directions, drums loosely mounted on the respective shafts, a flexible device connecting one drum with the load, a second flexible device connecting the two drums, two clutch members associated with each drum, one being fast on the shaft and the other mounted on the drum, one clutch member of each pair being movable into and out of engagement with its her, and means for shifting the movable clutch member to lock the drum on the shaft or release it therefrom, as may be desired.

7. The combination with a load, of two shafts, means for rotating the shafts in reverse directions, drums loose on the respective shafts, a flexible device connecting one druin with the load, a second flexible device connecting the two drums, two clutch members associated with each drum, one being fast on the shaft and the other mounted on the drum, one clutch member of each pair being movable into and out of engagement with its companion member, and means connected with the movable clutch member of both pairs for interlocking ei her pair of clutch members while the members of the other pair are disconnected.

S. The combination with a load, of two shafts rotating in reverse directions, drums COYHPEH'llOlI 1116111- l normally loose on the shafts, a flexible device connecting one drum with the load, a second flexible device connecting the two drums, two clutch members associated with each drum, one being fast on the shaft and the other movably mounted on the drum, and means connected with the movable clutch members of both pairs for interlocking either pair of clutch members while the members of the other pair are disconnected.

9. The combination with a load, of two shafts rotating in reverse directions, drums normally loose on the shafts, a flexible device connecting one drum with the load, a second flexible device connecting the two drums, two clutch members associated with each drum, one being fast on the shaft and the other movably mounted on the drum, and manually operated means connected with the clutch members of both pairs for interlocking either pair of clutch members while the members of the other pair are disconnected.

10. The combination with a load, of two shafts rotating in reverse directions, drums normally loose on the respective shafts, a flexible device connecting one drum with the load, a second flexible device connecting the two drums, two clutch members associated with each drum, one clutch member of each pair being slidably connected with the drum while the other clutch member is fast on the shaft, and a manually operated lever connected with the loose clutch members of both pairs for shifting the movable clutch member of either pair for interlocking the individual members of either pair while the said members of the other pair are disconnected.

11. The combination with a load, of two shafts, means for rotating the shafts in reverse directions, drums loose on the shafts, a flexib e device connecting one drum with the load, a second flexible device connecting the two drums, a pair of clutch members associated with each drum, one clutch member of each pair being slidably mounted, means for manually shifting the movable clutch member of either pair to interlock the clutch members of one pair whereby the corresponding drum is connected to rotate with its shaft while the other drum is loose on the other shaft, and means for automatically disconnecting the interlocked clutch members of one pair without interlocking the clutch members of the other pair.

12. The combination with a load, of two shafts, means for rotating the shafts in reverse directions, drums normally loose on the respective shafts, a flexible device connecting one drum with the load, a second flexible device connecting the two drums, means for manually connecting either drum to rotate with its shaft while the other drum is loose on the other shaft, and means for automatically disconnecting the said drum from its shaft without connecting the other drum with the other shaft.

13. The combination with a load, of two shafts, means for rotating the shafts in reverse directions, drums normally loose on the shafts, a flexible device connecting one drum with the load, a second flexible device connecting the two drums, means for manually connecting the one drum to rotate with its shaft, while the other drum is loose on the other shaft, means for automatically disconnecting the said drum from its shaft, and a brake for locking the two drums against rotation when loose on their respective shafts.

14. The combination with a load, of two shafts, means for rotating the shafts in reverse directions, drums normally loose on the respective shafts, a flexible device connecting one drum with the load, a second flexible device connecting the two drums, a brake engaging one drum and normally locking both drums against movement when both drums are loose on their shafts, and a manually operated lever for connecting either drum to rotate with its shaft while the other drum is loose on the other shaft, the said lever being also connected with the said brake to release the latter simultaneously with the connection of either drum I with its shaft.

15. The combination with a load, of two shafts, means for rotating the shafts in reverse directions, two drums normally loose on the respective shaft-s, an operative connection between one drum and the load, an operative connection between the two drums, whereby when either drum rotates with its shaft, the other drum is simultaneously rotated in harmony therewith, and means for manually connecting either drum to rotate with its shaft while the other drum is loose on the other shaft, substantially as described.

16. The combination with a load, of two shafts, means for rotating the shafts in reverse directions, drums loose on the respec-- tive shafts, an operative connection between one drum and the load for raising and lowering the latter, an operative connection be tween the two drums whereby when one is actuated, the other is rotated in harmony therewith, means for manually connecting either drum with its shaft to rotate therewith, while the other drum is loose on the other shaft, and means for automatically disconnecting either drum from its shaft, without interlocking the other drum with its shaft, and a brake engaging one drum for locking the two drums against movement in response to the weight of the load when both drums are loose on their shafts.

17 The combination with a load, of two shafts, worm wheels fast on the respective shafts, a worm interposed between the two wheels for rotating the shafts in reverse di rections, drums loose on the respective shafts, an operative connection between one drum and the load, an operative connection between the two drums, means for manually interlocking either drum with its shaft while the drum of the other shaft is loose thereon, means for automatically disconnecting either drum from its shaft without interlocking the other drum with the other shaft, and a brake engaging one drum for locking the two drums against movement in response to the pull of the load when both drums are disconnected from their shafts.

18. The combination with a series of movable scenic members, of operating drums, cables connected in operative relation with the respective drums and with the scenic members, band-brakes for controlling the movement of the respective drums, tension levers connected with one extremity of each of the said brakes, means initially operated for simultaneously releasing the brakes of all the drums to allow the latter to rotate in response to the weight of the scenic members connected therewith, said means including a manually operable lever, a rockshaft, and cams carried by the shaft and adapted to act upon the respective brake levers, for the purpose set forth.

19. T he combination with a series of movable scenic members, of a number of operating drums corresponding with the number of scenic members, cables connecting the respective scenic members in operative relation with the drums, brakes applied to the respective drums, and means for simultaneously releasing the brakes of all the drums, including a single operating lever, a rockshaft, and cams mounted on the shaft for acting on the respective brakes, substantially as described.

20. The combination with a series of scenic members, of operating drums corresponding in number with the scenic members, cables connecting the respective scenic members in operative relation with the several drums, means for operating each drum, means for manually connecting the drumoperating means with the drums, means for automatically disconnecting the operating means from each drum when the scenic member has reached its limit of movement in either direction, brakes applied to the various drums, and means for simultaneously releasing all of the brakes, including a manually operated lever, a rock-shaft with which the lever is connected, and cams mounted on the said shaft, substantially as described.

21. The combination with a series of movable scenic members, of two shafts, means for rotating the shafts in reverse directions, and a series of units for handling the scenic members, corresponding in number with said members, each unit consisting of two drums normally loose on the respective shafts, a flexible device connecting one drum with a scenic member, a second flexible device connecting the two drums, means for manually connecting one drum of each. unit to rotate with its shaft while the other drum of the same unit is loose on the other shaft, and means for automatically breaking the rotary relation between the said shaft and drum, while the other drum is loose on its shaft, and means for automatically locking the drums of each unit against rotation when loose on their shafts.

22. The combination with a series of movable scenic members, of two shafts, means for rotating the shafts in reverse directions. and a series of units for handling the scenic members, the said units corresponding in number with the said members, each unit consisting of two drums normally loose on the respective shafts, a flexible device connecting one drum with the scenic member, a second flexible device connecting the two drums, a manually operated lever for connecting either drum to rotate with its shaft while the other drum is loose on the other shaft, and means for automatically breaking the rotary relation between the said shaft and drum, while the other drum is loose on its shaft, and a brake for automatically locking the drums of each unit against rotation when both drums are loose, the said lever being arranged in such relation to the said brake that it releases the brake when actuated to connect either drum to rotate with its shaft, while the lever leaves the brake free to act when both drums are loose on the shaft.

In testimony whereof I aflix my signature in presence of two witnesses.

SETH G. BAILEY. lVitnesses A. J. OBnnnv,

VIRGINIA I. DAVIS.

US977500A 1910-05-21 1910-05-21 Apparatus for handling hanging scenery. Expired - Lifetime US977500A (en)

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US6520485B1 (en) * 2000-10-13 2003-02-18 Olaf Soot Winch system for raising and lowering theatre scenery
US20030111652A1 (en) * 2000-07-28 2003-06-19 Hoffend Donald A. Modular lift assembly
US20040084665A1 (en) * 2000-07-28 2004-05-06 Hoffend Donald A. Brake for hoist assembly
US20040098944A1 (en) * 2000-07-28 2004-05-27 Hoffend, Donald A. Batten for lift assembly
US20040099852A1 (en) * 2000-07-28 2004-05-27 Hoffend Donald A. Modular lift assembly
US20050239588A1 (en) * 2004-04-26 2005-10-27 Lin Cheng L Electric transmission module for window curtains having winding wheel
US20070246695A1 (en) * 2006-04-24 2007-10-25 Hoffend Donald A Jr Modular lift assembly having telescoping member
US9260279B2 (en) 2013-11-22 2016-02-16 Electronic Theatre Controls, Inc. Lift assembly with tapered drums

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US20090045381A1 (en) * 2000-07-28 2009-02-19 Hoffend Jr Donald A Modular lift assembly
US20030111652A1 (en) * 2000-07-28 2003-06-19 Hoffend Donald A. Modular lift assembly
US20040084665A1 (en) * 2000-07-28 2004-05-06 Hoffend Donald A. Brake for hoist assembly
US20040098944A1 (en) * 2000-07-28 2004-05-27 Hoffend, Donald A. Batten for lift assembly
US20040099852A1 (en) * 2000-07-28 2004-05-27 Hoffend Donald A. Modular lift assembly
US20040183060A1 (en) * 2000-07-28 2004-09-23 Hoffend Donald A. Safety sensor for a lift assembly
US6889958B2 (en) 2000-07-28 2005-05-10 Donald A. Hoffend, Jr. Brake for hoist assembly
US8789814B2 (en) * 2000-07-28 2014-07-29 Daktronics Hoist, Inc. Modular lift assembly
US20130001488A1 (en) * 2000-07-28 2013-01-03 Daktronics Hoist, Inc. Modular lift assembly
US6988716B2 (en) * 2000-07-28 2006-01-24 Hoffend Jr Donald A Modular lift assembly
US6997442B2 (en) 2000-07-28 2006-02-14 Hoffend Jr Donald A Safety sensor for a lift assembly
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US7484715B2 (en) 2006-04-24 2009-02-03 Daktronics Hoist, Inc. Modular lift assembly having telescoping member
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