GB2135590A - Theatrical stage - Google Patents

Theatrical stage Download PDF

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Publication number
GB2135590A
GB2135590A GB8305714A GB8305714A GB2135590A GB 2135590 A GB2135590 A GB 2135590A GB 8305714 A GB8305714 A GB 8305714A GB 8305714 A GB8305714 A GB 8305714A GB 2135590 A GB2135590 A GB 2135590A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
shearlegs
screw
tables
members
stage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8305714A
Other versions
GB8305714D0 (en )
GB2135590B (en )
Inventor
Urho Heikkinen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elevator GmbH
Original Assignee
Elevator GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/065Scissor linkages, i.e. X-configuration
    • B66F7/0666Multiple scissor linkages vertically arranged
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/0608Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement driven by screw or spindle
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/065Scissor linkages, i.e. X-configuration
    • B66F7/0658Multiple scissor linkages horizontally arranged
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H3/00Buildings or groups of buildings for public or similar purposes; Institutions, e.g. infirmaries, prisons
    • E04H3/10Buildings or groups of buildings for public or similar purposes; Institutions, e.g. infirmaries, prisons for meetings, entertainments, or sports
    • E04H3/22Theatres; Concert halls; Studios for broadcasting, cinematography, television or similar purposes
    • E04H3/24Constructional features of stages
    • E04H3/26Revolving stages; Stages able to be lowered

Abstract

The stage comprises a plurality of side-by-side, screw-operated shearlegs tables (1), each such table having its own operating mechanism (3) connected to a screw (2) and the movement of the tables being synchronized by employing electro- hydraulic step motors as the operating mechanisms. The screw (2) acts on the linkage members (5, 6, 7, 8) via transmission members (9, 10, 11, 12) and may be automatically arrested on the stopping of movement of the tables by means of a brake (4) provided on its shaft. <IMAGE>

Description

SPECIFICATION Theatrical stage The present invention relates to a theatrical stage comprising a plurality of side-by-side, screw-operated shearlegs tables, each such table having its own operating mechanism connected to the screw.

The theatrical stage of the invention is characterized in that the movement of the shearlegs tables has been synchronized by employing electro-hydraulic step motors for operating mechanism. With the aid of the invention, the positions of the tables, both individually and with reference to each other, are always at correct elevation because a step motor in connection with a mechanical screw causes no errors to the tables in vertical direction. The hydraulic step motor will not stop until it has turned the screw the required number of turns, whereby the table will positively remain stationary at the correct height. When it is desired to have all tables or part of them on the same level, they will indeed, thanks to the step motor, position themselves at the same level with very high accuracy.

An advantageous embodiment of the invention, wherein there are shearlegs members between the platform and the base, by the aid of which the platform is held in a constant direction in spite of vertical movements and wherein the vertical movements of the platform have been accomplished by means of a screw connected with the shearlegs members, as characterized in that the screw has been connected to the shearlegs members by transmission members with the aid of which the movement of the platform will be throughout nearly linear in relation to the rotation of the screw. Hereby the task can be managed with a less powerfull lifting motor, because the required lifting force is the same in the upper as well as lower position of the platform.When the platform has been stopped at a given level, it is held firmly stationary because the screw has no elasticity, nor any ieakage, like a hydraulic cylinder.

Another embodiment of the invention, featuring two shearlegs members located one over the other and pivotally joined, and each shearlegs member having its own pair of linkage arms, is characterized in that the lower end of the linkage arm pair of the upper shearlegs member has been pivotally attached at one common pivotal point of the shearlegs members, and that the upper end of the linkage arm pair of the lower shearlegs member has been pivotally attached at the other end common pivotal point of the shearlegs members, and that one and the same screw acts on both linkage arm pairs. It thus becomes possible by one and the same screw to make the lifting movements act on both shearlegs members, whereby the forces are more uniformly distributed over the whole lifting system.

A third embodiment of the invention is characterized in that the step motors are electrically controllable from one and the same control desk.

One embodiment of the invention is further characterized in that the screws of the tables have been arranged, on stopping of the screws' motion, to be automatically arrestable by means of a brake on the shaft of the screw. Thus the table will remain firmly stationary when the rotary motion of the step motor has stopped.

The invention is described in the following with the aid of an example, with reference made to the attached drawing, wherein Fig. 1 presents part of a theatrical stage, simplified and viewed obliquely from above.

Fig. 2 presents the shearlegs table in elevational view.

The theatrical stage comprises a plurality of side-by-side, screw-operated shearlegs tables 1, each such table having its own operating mechanism 3 connected to the screw 2. The movement of the shearlegs tables 1 has been synchronized, employing as operating mechanism 3 electro-hydraulic step motors. The step motor comprises an electrically driven pulse motor, operating by electrical pulses and controlling the rotary movements of a hydraulicaliy driven operating motor in accordance with instructions given in advance. After the commands and control actions, it is always known at which elevation the table is residing. The step motors are electrically controllable from one and the same control desk. The screws 2 of the tables have been arranged, after stopping of the movement, to be automatically arrestable by means of a brake 4 on the shaft of the screw.

The screw 2 acts on the linkage rods 5, 6, 7, 8 of the shearlegs table by the aid of linkage arms 9, 10, 11, 12, whereby the movement of the table will be linear throughout, in relation to the rotation of the screw. As a consequence also the simultaneous movements of a plurality of tables, compared with each other, will be equal in amount at all times, and the overall impression gained of the transformation of the theatrical stage is smooth and controlled.

It is obvious to a person skilled in the art that different embodiments of the inventoin may vary within the scope of the claims stated below. For instance, this system may be further elaborated by techniques known in themselves in the art, e.g.

by providing the control desk with a memory carrying records of the transformations in the theatrical stage required in theater programmes, whereby the transformations will be accomplished rapidly and without exertion.

1. Theatrical stage, comprising a plurality of side-by-side, screw-operated shearlegs tables (1), each such table having its own operating mechanism (3) connected to the screw (2), characterized in that the movement of the shearlegs tables (1) has been synchronized by using for operating mechanisms (3), electro hydraulic step motors.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Theatrical stage The present invention relates to a theatrical stage comprising a plurality of side-by-side, screw-operated shearlegs tables, each such table having its own operating mechanism connected to the screw. The theatrical stage of the invention is characterized in that the movement of the shearlegs tables has been synchronized by employing electro-hydraulic step motors for operating mechanism. With the aid of the invention, the positions of the tables, both individually and with reference to each other, are always at correct elevation because a step motor in connection with a mechanical screw causes no errors to the tables in vertical direction. The hydraulic step motor will not stop until it has turned the screw the required number of turns, whereby the table will positively remain stationary at the correct height. When it is desired to have all tables or part of them on the same level, they will indeed, thanks to the step motor, position themselves at the same level with very high accuracy. An advantageous embodiment of the invention, wherein there are shearlegs members between the platform and the base, by the aid of which the platform is held in a constant direction in spite of vertical movements and wherein the vertical movements of the platform have been accomplished by means of a screw connected with the shearlegs members, as characterized in that the screw has been connected to the shearlegs members by transmission members with the aid of which the movement of the platform will be throughout nearly linear in relation to the rotation of the screw. Hereby the task can be managed with a less powerfull lifting motor, because the required lifting force is the same in the upper as well as lower position of the platform.When the platform has been stopped at a given level, it is held firmly stationary because the screw has no elasticity, nor any ieakage, like a hydraulic cylinder. Another embodiment of the invention, featuring two shearlegs members located one over the other and pivotally joined, and each shearlegs member having its own pair of linkage arms, is characterized in that the lower end of the linkage arm pair of the upper shearlegs member has been pivotally attached at one common pivotal point of the shearlegs members, and that the upper end of the linkage arm pair of the lower shearlegs member has been pivotally attached at the other end common pivotal point of the shearlegs members, and that one and the same screw acts on both linkage arm pairs. It thus becomes possible by one and the same screw to make the lifting movements act on both shearlegs members, whereby the forces are more uniformly distributed over the whole lifting system. A third embodiment of the invention is characterized in that the step motors are electrically controllable from one and the same control desk. One embodiment of the invention is further characterized in that the screws of the tables have been arranged, on stopping of the screws' motion, to be automatically arrestable by means of a brake on the shaft of the screw. Thus the table will remain firmly stationary when the rotary motion of the step motor has stopped. The invention is described in the following with the aid of an example, with reference made to the attached drawing, wherein Fig. 1 presents part of a theatrical stage, simplified and viewed obliquely from above. Fig. 2 presents the shearlegs table in elevational view. The theatrical stage comprises a plurality of side-by-side, screw-operated shearlegs tables 1, each such table having its own operating mechanism 3 connected to the screw 2. The movement of the shearlegs tables 1 has been synchronized, employing as operating mechanism 3 electro-hydraulic step motors. The step motor comprises an electrically driven pulse motor, operating by electrical pulses and controlling the rotary movements of a hydraulicaliy driven operating motor in accordance with instructions given in advance. After the commands and control actions, it is always known at which elevation the table is residing. The step motors are electrically controllable from one and the same control desk. The screws 2 of the tables have been arranged, after stopping of the movement, to be automatically arrestable by means of a brake 4 on the shaft of the screw. The screw 2 acts on the linkage rods 5, 6, 7, 8 of the shearlegs table by the aid of linkage arms 9, 10, 11, 12, whereby the movement of the table will be linear throughout, in relation to the rotation of the screw. As a consequence also the simultaneous movements of a plurality of tables, compared with each other, will be equal in amount at all times, and the overall impression gained of the transformation of the theatrical stage is smooth and controlled. It is obvious to a person skilled in the art that different embodiments of the inventoin may vary within the scope of the claims stated below. For instance, this system may be further elaborated by techniques known in themselves in the art, e.g. by providing the control desk with a memory carrying records of the transformations in the theatrical stage required in theater programmes, whereby the transformations will be accomplished rapidly and without exertion. CLAIMS
1. Theatrical stage, comprising a plurality of side-by-side, screw-operated shearlegs tables (1), each such table having its own operating mechanism (3) connected to the screw (2), characterized in that the movement of the shearlegs tables (1) has been synchronized by using for operating mechanisms (3), electro hydraulic step motors.
2. Theatrical stage according to claim 1, having between the platform and base shearlegs members (5, 6, 7, 8) by the aid of which the platform is held in the same orientation regardless of the vertical movements, and in this stage the vertical movements of the platform having been accomplished with the aid of a screw (2) connected to the shearlegs members, characterized in that the screw (2) has been connected to the shearlegs members (3, 4) by transmission members (9, 10, 11, 12) by the aid of which the movement of the platform is almost linear in relation to the rotation of the screw all the time.
3. Theatrical stage according to claim 2, comprising two shearlegs members (5, 6, 7, 8) located one above the other and pivotally joined, each shearlegs member having its own linkage arm pair (9, 10, 11, 12), characterized in that the lower end of the linkage arm pair (11, 12) of the upper shearlegs member (7, 8) has been pivotally attached at one common pivotal point of the shearlegs members and the upper end of the linkage arm pair (9, 10) of the lower shearlegs member (5, 6) has been pivotally attached at the other common pivotal point of the shearlegs members, and that one and the same screw (2) acts on both linkage arm pairs (5, 6, 7, 8).
4. Theatrical stage according to any one of claims 1-3, characterized in that the step motors (3) are electrically controllable from one and the same control desk.
5. Theatrical stage according to any one of claims 1-4, characterized in that the screws (2) of the tables (1 ) have been arranged after stopping of the motion to be automatically arrestable by means of a brake (4) on the shaft of the screw.
6. Theatrical stage substantially as herein described with reference to the accompanying drawings.
GB8305714A 1981-09-03 1983-03-02 Theatrical stage Expired GB2135590B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FI812721A FI65761C (en) 1981-09-03 1981-09-03 Teaterscen

Publications (3)

Publication Number Publication Date
GB8305714D0 GB8305714D0 (en) 1983-04-07
GB2135590A true true GB2135590A (en) 1984-09-05
GB2135590B GB2135590B (en) 1986-10-22

Family

ID=8514672

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8305714A Expired GB2135590B (en) 1981-09-03 1983-03-02 Theatrical stage

Country Status (4)

Country Link
DE (1) DE3232476C2 (en)
FI (1) FI65761C (en)
FR (1) FR2542031B1 (en)
GB (1) GB2135590B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2607856A1 (en) * 1986-12-03 1988-06-10 Chatenay Catherine mobile structure for meetings rooms or shows
GB2386062A (en) * 2002-03-07 2003-09-10 Huntleigh Technology Plc Adjustable bed
US7607962B2 (en) 2006-05-04 2009-10-27 Mattel, Inc. Electronic toy with alterable features
GB2470033A (en) * 2009-05-06 2010-11-10 Nick South Programmable adjustable foot rest for standing performer
CN103523707A (en) * 2013-10-15 2014-01-22 唐易平 Shear mode mechanism capable of being controlled in numerical mode and shear mode mechanism drive system formed by shear mode mechanisms in combined mode

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3816382A1 (en) * 1988-05-13 1989-11-23 Hydro Geraetebau Gmbh & Co Kg Ancillary apparatus for an aircraft loading and unloading device
DE102004044969A1 (en) * 2004-09-01 2006-03-02 Hans Balzer Gmbh & Co. Kg Werkstatt- Und Fahrzeugtechnik Lifting device for motor and rail vehicles comprises a platform which moves along a pit base

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1386398A (en) * 1971-07-31 1975-03-05 Keeble D Load-lifting apparatus
GB1432094A (en) * 1974-03-14 1976-04-14 Bissell H M Stage platform control system
EP0034221A1 (en) * 1980-01-31 1981-08-26 Hans-Jochen Eisenberg Vertically adjustable platform-trestle for theatre stages or the like

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1124664B (en) * 1957-11-25 1962-03-01 Maschf Augsburg Nuernberg Ag Control means for the simultaneous drive of a lifting floors Theaterbuehne
FR1383677A (en) * 1964-03-05 1964-12-24 Geilinger & Co Scissor lift
US3982718A (en) * 1975-07-31 1976-09-28 Dentsply Research & Development Corporation Operatory chair operating mechanism
FR2503119A1 (en) * 1981-04-07 1982-10-08 Ruettinger Armin Lifting frame for ceiling panel installation - has motor driven double scissor linkages with telescopic upper links carrying travel limiting switches

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1386398A (en) * 1971-07-31 1975-03-05 Keeble D Load-lifting apparatus
GB1432094A (en) * 1974-03-14 1976-04-14 Bissell H M Stage platform control system
EP0034221A1 (en) * 1980-01-31 1981-08-26 Hans-Jochen Eisenberg Vertically adjustable platform-trestle for theatre stages or the like

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2607856A1 (en) * 1986-12-03 1988-06-10 Chatenay Catherine mobile structure for meetings rooms or shows
EP0271402A1 (en) * 1986-12-03 1988-06-15 Catherine Marie épouse Compagnone Chatenay Mobile structure for meeting or civic spectacle rooms
US4854092A (en) * 1986-12-03 1989-08-08 Chatenay Epouse Catherine M Mobile structure for meeting halls or auditoriums
GB2386062A (en) * 2002-03-07 2003-09-10 Huntleigh Technology Plc Adjustable bed
GB2386062B (en) * 2002-03-07 2004-04-28 Huntleigh Technology Plc Adjustable bed
US7607962B2 (en) 2006-05-04 2009-10-27 Mattel, Inc. Electronic toy with alterable features
GB2470033A (en) * 2009-05-06 2010-11-10 Nick South Programmable adjustable foot rest for standing performer
GB2470033B (en) * 2009-05-06 2011-10-12 Nick South Adjustable rock step
CN103523707A (en) * 2013-10-15 2014-01-22 唐易平 Shear mode mechanism capable of being controlled in numerical mode and shear mode mechanism drive system formed by shear mode mechanisms in combined mode

Also Published As

Publication number Publication date Type
FI812721L (en) 1983-03-04 grant
DE3232476A1 (en) 1983-03-17 application
FR2542031B1 (en) 1988-03-04 grant
DE3232476C2 (en) 1991-01-24 grant
FI812721A (en) application
FI65761B (en) 1984-03-30 application
GB8305714D0 (en) 1983-04-07 grant
FI65761C (en) 1984-07-10 grant
GB2135590B (en) 1986-10-22 grant
FR2542031A1 (en) 1984-09-07 application

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950302