GB2390640A - Torsion Spring Assembly for Up and Over Door - Google Patents

Torsion Spring Assembly for Up and Over Door Download PDF

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Publication number
GB2390640A
GB2390640A GB0216070A GB0216070A GB2390640A GB 2390640 A GB2390640 A GB 2390640A GB 0216070 A GB0216070 A GB 0216070A GB 0216070 A GB0216070 A GB 0216070A GB 2390640 A GB2390640 A GB 2390640A
Authority
GB
United Kingdom
Prior art keywords
carriage
torsion spring
spring
spring shaft
shaft
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
GB0216070A
Other versions
GB0216070D0 (en
GB2390640B (en
Inventor
Peter John Kirton
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.)
P C Henderson Ltd
PC Henderson Ltd
Original Assignee
P C Henderson Ltd
PC Henderson Ltd
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
Application filed by P C Henderson Ltd, PC Henderson Ltd filed Critical P C Henderson Ltd
Priority to GB0216070A priority Critical patent/GB2390640B/en
Publication of GB0216070D0 publication Critical patent/GB0216070D0/en
Publication of GB2390640A publication Critical patent/GB2390640A/en
Application granted granted Critical
Publication of GB2390640B publication Critical patent/GB2390640B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
    • E05D13/00—Accessories for sliding or lifting wings, e.g. pulleys, safety catches
    • E05D13/003—Anti-dropping devices
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
    • E05D13/00—Accessories for sliding or lifting wings, e.g. pulleys, safety catches
    • E05D13/10—Counterbalance devices
    • E05D13/12—Counterbalance devices with springs
    • E05D13/1253—Counterbalance devices with springs with canted-coil torsion springs
    • E05D13/1261—Counterbalance devices with springs with canted-coil torsion springs specially adapted for overhead wings
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
    • E05D15/00—Suspension arrangements for wings
    • E05D15/40—Suspension arrangements for wings supported on arms movable in vertical planes
    • E05D15/44—Suspension arrangements for wings supported on arms movable in vertical planes with pivoted arms and vertically-sliding guides
    • E05D15/445—Suspension arrangements for wings supported on arms movable in vertical planes with pivoted arms and vertically-sliding guides specially adapted for overhead wings
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/80—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling
    • E06B9/82—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic
    • E06B9/84—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic against dropping
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
    • E05Y2900/106—Application of doors, windows, wings or fittings thereof for buildings or parts thereof for garages

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Closing And Opening Devices For Wings, And Checks For Wings (AREA)

Abstract

A torsion spring assembly for an up and over canopy door includes at least one torsion spring 130, 132 mounted about a spring shaft 118. A carriage 134 is connected to the at least one torsion spring and an axial stop means 148 and a restraint means 152, 154 are also provided. The arrangement is such that upon failure of the at least one torsion spring, the carriage is moved axially with respect to the spring shaft until halted by the axial stop means at which point further rotation of the carriage and the spring shaft is prevented by the restraining means. The arrangement prevents the door from dropping from an open position in the event of a failure of the at least one torsion spring.

Description

- 1 Improvements in and relating to an improved torsion spring assembly
The present invention relates to an improved torsion spring assembly, and in particular to such an assembly for use in an operating or lifting gear. The 5 invention has particular application in the operating or lifting gear of doors of the kind known as "canopy" doors.
There are many types of operating gear used in providing balancing forces on canopy doors such as garage doors. In one form a torsion spring is used to 10 provide the force required to balance a door leaf in order to make the operation of opening and closing the door leaf easier. A torsion spring is securely fixed at one end to a rigid structure. The free end of the torsion spring is rotated to tension the torsion spring before it is locked onto a central spindle which has a cone or drum fixed at each end. These drums provide support for cables that are wound 15 around the cones and fixed to the door leaf. The tension provided in the spring.
À À provides a lifting action to the door leaf through the cables supported on each drum.... À - - À-: In the event of the door leaf being in an open position the torsion spring provides À - - 20 forces to balance the door leaf. In the event of a spring failure all of the retaining À.
Àe - force will be lost and it is a problem that the door leaf will fall to a closed position À.
without restraint. In this situation the full mass of the door leaf becomes dangerous and is capable of causing injury to any persons and/or damage to vehicles or other items in the closing path of the door leaf.
It is an advantage of the present invention that it eliminates or significantly reduces this problem in that a means for acting upon failure of the torsion spring assembly is provided to minimize movement of the door leaf to avoid the risk of damage to people or property.
According to a first aspect of the present invention a torsion spring assembly comprising at least one torsion spring mounted about a spring shaft, a carriage
- 2 connected to the at least one torsion spring, axial stop means and a restraining means, such that upon failure of the at least one torsion spring the carriage is moved axially with respect to the spring shaft until halted by the axial stop means at which point further rotation of the carriage and the spring shaft is prevented by 5 the restraining means.
Preferably, the at least one torsion spring comprises a first torsion spring and a second torsion spring in which the carriage is connected between the first torsion spring and the second torsion spring, the first torsion spring, the second torsion 10 spring and the carriage being mounted about the spring shaft.
More preferably, the carriage comprises a main body portion located about the spring shaft and having first and second radially extending flanges, the axial stop means comprises an axially displaceable secondary spindle having at a first part 15 a radially extending flange, in use adapted to be disposed between the first and..
second radially extending flanges, at second part a region having first and second radially extending regions and at a third part limiting means to limit axial À.
movement of the second spindle, and the restraining means comprises a À.
protrusion extending radially from and fixed axially to the spring shaft for rotation 20 therewith such that upon failure of the at least one torsion spring the carriage and the stop means are displaced axially until halted by the limiting means at which point further rotation of the carriage and the spring shaft is prevented by abutment of the protrusion and one of the first and second radially extending regions of the stop means.
Aiterantively, the carriage comprises first and second ends between which extend a plurality of abutment means each of which being so shaped and disposed so as to provide a relatively narrow freedom of rotation about the spring shaft towards each end of the carriage and a relatively large freedom of rotation about the 30 spring shaft therebetween, the restraining means comprises a protrusion extending radially from and fixed axially to the spring shaft for rotation therewith and the axial stop means comprises stop elements disposed to either side of the
- 3 carriage such that upon failure of the at least one torsion spring the carriage is displaced axially until halted both against axial and rotational movement by the axial stop means at which point further rotation of the spring shaft is prevented by abutment of the protrusion and one of the abutment means.
In an alternative embodiment, the axial stop means comprise stop elements disposed to either side of the carriage, and the restraining means comprises a displaceable element associated with the carriage and adapted for rotation therewith, such that upon failure of the at least one torsion spring the carriage is 10 displaced axially until halted by one of the stop elements at which point abutment of the displaceable element with one of the stop elements thereby urges the displaceable element into braking contact with the spring shaft to prevent rotation thereof. 15 Preferably, the displaceable element comprises a lever mounted within the..
carriage. Alterantvely, the displaceable element comprises a bar retained within the carnage. In each case, biasing means may be provided in the carriage to..
bias the displaceable element away from the spring shaft. À...
20 In a further alternative, the carriage comprises first and second end plates having a connecting structure extending therebetween, the restraining element comprises a radially displaceable element supported thereon, such that upon failure of the at least one torsion spring the carriage is displaced axially until halted by one of the stop elements at which point further rotation of the spring 25 shaft is prevented by abutment of the displaceable element with one of the stop elements thereby urging the displaceable element into braking contact with the spring shaft to prevent rotation thereof.
Preferably, the restraining means is formed integrally with the carriage.
- 4 According to a second aspect of the invention, a canopy door assembly incorporates a torsion spring assembly in accordance with a first aspect of the present invention.
5 The invention will now be described, by way of example only, with reference to the accompanying Figures, in which Figure 1 shows an example of a prior art torsion spring assembly and an
associated canopy door leaf; Figure 2 shows a torsion spring assembly in accordance with a first embodiment 10 of the present invention; Figure 3 shows a torsion spring assembly in accordance with a second embodiment of the present invention; Figure 4 shows a torsion spring assembly in accordance with a third embodiment of the present invention; 15 Figure 4A shows a section along line A-A of Figure 4;..
Figure 5 shows a torsion spring assembly in accordance with a fourth embodiment of the present invention; Figure 5A shows a section along line A-A of Figure 5; À Figure 6 shows a torsion spring assembly in accordance with a fifth embodiment....
20 of the present invention; and.
Figure 6A shows a section taken in the direction of arrow A in Figure 6. À Referring first to Figure 1, there may be seen a framed canopy door in which the operating or lifting gear is provided by a known torsion spring assembly.
A frame 2, comprising a frame head 4 and first and second frame legs 6, is provided about a door leaf 8. The door leaf 8 is supported by first and second canopy arms 10 that are free to pivot within respective first and second head brackets 12 which are fixed to the frame head 4. The head brackets 12 support a 30 torsion spring assembly. A torsion spring 14 is anchored at one end to one of the first and second head brackets 12. The free end of the torsion spring is wound using a spring plug 16 and then locked using a grub screw (not shown) to a
- s - spr.ng shaft 18. A cone and cable set 20 is secured at each end of the spring shaft 18. Each cable is attached to a roller spindle 22 that is supported on the door leaf 8. The tension within the torsion spring 14 is transmitted through the spring shaft 18 and each of the cone and cable sets 20. This provides a vertical 5 force to each roller spindle 22 that can be used to balance the door leaf 8 during opening and closing operations. Each roller spindle 22 is restrained in a jamb channel 24 that is fixed to a respective one of the frame legs 6.
If the torsion spring 14 fails for any reason, then the force applied to the door 10 leaf 8 is lost. If this occurs when the door leaf 8 is fully or partially open, then the door leaf 8 will close with an increasing velocity due to gravitational acceleration.
A first embodiment of the invention will now be described with reference to Figure A torsion spring assembly comprises a first torsion spring 130 and a...
l5 second torsion spring 132. A carriage 134 is located between the first torsion.
spring 130 and the second torsion spring 132 to join the respective torsion springs 13O,132 together. The carriage 134 and the torsion springs 13O,132 are supported about a spring shaft 118. In this way the carriage 134 may slide and.
rotate with movement induced by the torsion springs 13O, 132. As may be seen....
20 the carriage 134 comprises a main body portion on which are provided first and..
second radially extending flanges 136,138 spaced from one another. À The spring shaft 118 is supported on head brackets 112 (only one of which is shown in the Figure for clarity) attached to a frame head 104. One or more 25 support brackets 140 may also be attached to the frame head 104. Such support brackets 140 will prevent sag in the adjacent torsion springs 13O,132.
A secondary spindle 142 is supported at one end by the head bracket 112 and at a second end by a second bracket 144. The secondary spindle 142 is provided 30 with a guide plate 146 in the form of a radially extending flange. At least a part of the guide plate 146 is positioned between the radially extending flanges 136, 138 of the carriage 134.
- 6 A stop 148 Is provided at the first end of the secondary spindle 142 between first and second limbs of the head bracket 112. A lock keep 150 is fixed to the secondary spindle 142 between the head bracket 112 and the second S bracket 144. The lock keep 150 comprises two spaced axially extending regions or lands 154. A lock pin 152 is provided extending through the spring shaft 118 and rotates with the spring shaft 118. In normal operation the lock pin 152 is free to rotate between the lands 154 of the lock keep 150.
10 A spring plug 116, cone 122 and canopy arm 110 are also shown in Figure 2.
Upon failure of either one of the first torsion spring 130 or the second torsion spring 132, the other of the first torsion spring 130 and the second torsion spring 132 will move the carriage 134 to the left or right as the case may be.
15 Movement of the carriage 134 will push one of the first and second..
flanges 136,138 on the carriage into contact with the guide plate 146 and thereby move the guide plate 146 and associated secondary spindle 142 in the same À.
d irection. À. 2 À- 20 Movement of the secondary spindle 142 will be halted when the stop 148 is..
moved into contact with one of the limbs of the head bracket 112. In this position one of the lands 154 of the lock keep 150 prevents movement of the lock pin 152 and thus rotation of the spring shaft 118. Since the spring shaft 118 cannot rotate movement of the associated door leaf (not shown) is halted.
In a modification (not shown) a single torsion spring may replace the first and second torsion springs 130, 132 with the carriage component being carried from the single torsion spring to move the guide plate 146 in the event of spring failure.
30 A second embodiment of the invention is shown in Figure 3. A torsion spring assembly comprises a first torsion spring 230 and a second torsion spring 232. A carriage 234 is located between the first torsion spring 230 and the second
torsion spring 232 to join the respective torsion springs 230, 232 together. The carriage 234 and the torsion springs 23O, 232 are supported on a spring shaft 218. A lock pin 252 is provided through the spring shaft 218 and is adapted to rotate therewith. In normal use, the lock pin 252 is located between the first S and second torsion springs 230, 232 within a space defined by the carriage 234.
The carnage 234 comprises first and second ends 258, each end joined to a respective torsion spring 230, 232. Between the ends 258 there extend a number of radially directed flats 256. Each flat 256 includes a recessed region 10 between axially extending portions 254 adjacent the first and second ends 258.
The recessed regions of the flats 256 define the space within which the lock pin 252 is normally free to rotate. First and second lock keeps 250 are provided on the frame head 204 to either side of the normal operating position of the carriage 234. À 15:.'.
Upon failure of either one of the first torsion spring 230 or the second torsion spring 232, the other of the first torsion spring 230 and the second torsion spring..
232 will move the carriage 234 to the left or right as the case may be. In either À..
case, the carriage 234 will move and one of the raised portions 254 will engage a 20 the lock pin 252 to key these components together for rotational movement. The axial movement of the Carriage 234 is halted when an end 258 of the carriage.' 234 abuts one of the lock keeps 250. Engagement with the lock keep 250 then prevents rotations of the carriage 234. Since the carriage 234 is held against rotation, the spring shaft 218 is also held against rotation due to the action of the 25 lock pin 252 keyed thereto. Since the spring shaft 218 cannot rotate, movement of the associated door leaf (not shown) is halted.
A third embodiment of the present invention is shown in Figures 4 and 4A. The torsion spring assembly comprises a first torsion spring 330 and a second torsion 30 spring 332. A carriage 334 is located between the first torsion spring 330 and the second torsion spring 332 to join the respective torsion springs together. The carriage 334 and the torsion springs 330, 332 are supported on a spring
- 8 shaft 318. In normal operation, the carriage 334 is disposed between first and second lock restraints 350.
The carriage 334 supports a lever 352. The lever 352 is adapted to pivot about a 5 pivot pin 362 and in the illustrated embodiment is in normal use pushed away from the spring shaft 318 by biasing means 360. In the illustrated embodiment the biasing means 360 comprises a compression spring, through other biasing means may be adapted. For example the biasing means may comprise a torsion or tension spring integral with the lever 352. In a modification (not shown) the 10 biasing means may be omitted, since in normal operations it is sufficient that the lever 352 will not be directed against the spring shaft 318.
Upon failure of either one of the first torsion spring 330 or the second torsion spring 332, the other of the first torsion spring 330 and the second torsion Is spring 332 will move the carriage 334 to the left or the right as the case may be..
into one of the first and second lock restraints 350.
À:. A free end of the lever 352 then rotates (in the direction of arrow A in Figure 4A) A., into contact with the lock restraint 350. The force exerted by the biasing 20 means 360 is overcome and the lever 352 pushed into engagement with the..
spring shaft 318 to brake movement of the spring shaft 318 (as indicated by À.
arrow B). In the illustrated embodiment, a rear surface of the lever 352 is provided with a recessed portion 364 for engagement with the spring shaft 318.
Since the spring shaft 318 is held against rotation, movement of the associated 25 door leaf (not shown) is halted.
The interface between the spring shaft 318 and the lever 352 may be modified by the provision of flats or indents on either the spring shaft 318 or the lever 352.
30 A fourth embodiment of the present invention is shown in Figures 5 and 5A. As before, a torsion spring assembly comprises a first torsion spring 430 and a second torsion spring 432. A carriage 432 is located between the first torsion
spring 430 and the second torsion spring 432 to join the respective torsion springs together. The carriage 432 and the torsion springs 430, 432 are supported about a spring shaft 418. In normal operation, the carriage 434 is disposed between first and second lock restraints 450.
The carriage 434 retains a brake bar 452 therein. In normal operation, the brake bar 452 is free to slide within a suitable recess 466 provided in the carriage 434.
The limit of the movement of the brake bar 452 is defined by co-operation between a pin 462 provided in the carriage 434 and a track or recess 468 10 provided in the brake bar 452.
Upon failure of either one of the first torsion spring 430 or the second torsion A.
spring 432, the other of the first torsion spring 430 and the second torsion À. À, spring 432 will move the carriage 434 to the left or the right as the case may be 15 into one of the first and second lock restraints 450.; A free end of the brake bar 452 then rotates (in the direction of arrow A in Figure.' 5A) into contact with the lock restraint 450. The force exerted between the brake À., bar 452 and the lock restraint 450 drives the brake bar 452 into engagement with 20 the spring shaft 418 (as indicated by arrow B). The spring shaft 418 will then be held against rotation, thereby preventing movement of the associated door leaf (not shown).
In the illustrated embodiment, one end of the brake bar 452 is provided with a 25 recessed portion 464 for engagement with the spring shaft 418. The interface between the spring shaft 418 and the brake bar 452 may be modified by the provision of flats or indents on either the spring shaft 418 or the brake bar 452.
A fifth embodiment of the present invention is shown in Figures 6 and 6A. Once 30 again, a torsion spring assembly comprises a first torsion spring 530 and a second torsion spring 532. A carriage 534 is located between the first torsion spring 530 and the second torsion spring 532 to join the respective torsion
- 10 sprngs together. The carriage 534 and the torsion springs 530, 532 are supported about a spring shaft 518 In normal operation, the carriage 534 is disposed between first and second lock restraints 550.
5 The carriage 534 comprises a first end plate 536 attached to one end of the first torsion spring 530 and a second end plate 538 attached to one end of the second torsion spring 532. The first and second end plates 536, 538 are held rigidly with respect to one another by pins or other fasteners 572 extending between the first and second end plates 536, 538. A spring brake 552 is carried between the first 10 and second end plates 536, 538.
The spring brake 552 is provided with a first set of clearance holes 574 (shown in A.
ghost in Figure 6A) through which the pins 572 extrude. A central bore 570. a, (shown in ghost in Figure 6A) is provided through which the spring shaft 518 Is passes. In normal operation, the spring shaft 518 may rotate freely through the central bore 570.
Upon failure of either one of the first torsion spring 530 or the second torsion À..
spring 532, the other of the first torsion spring 530 and the second torsion spring 20 532 will move the carriage 134 to the left or the right as the case may be towards one of the first and second lock restraints 550. The spring brake 552 will be forced into contact with one of the lock restraints 550. As may be seen in ghost in Figure 6 and more clearly in Figure 6A a clearance is provided between the lock restraints 550 and the first and second end plates 536, 538.
When the spring brake 552 is pulled into contact with one of the lock restraints 550, the tapered edges 576 on the spring brake 552 come into contact with the ramped edges 578 (shown dotted in Figure 6) on the lock restraint 550.
This interference and the force provided from the intact torsion spring force the 30 central bore 570 of the spring brake 552 into contact with the spring shaft 518.
This creates a braking force thereby preventing rotation of the spring shaft 56 and supporting the door leaf (not shown) against rotation.
The interface between the spring shaft 518 and the spring brake 552 may be modified by the provision of flats or indents on either the spring shaft 518 or the spring brake 552.
In a modification (not shown) the carriage is constructed as a unitary piece with the spring brake. This modification operates in a very similar way to the embodiment shown in Figures 6 and 6A. A central bore in the modified spring brake is provided with clearance around the spring shaft until one of the first and 10 second torsion springs breaks when the interference as the spring brake is pulled into the lock restraint once again provides the braking force. In this way the number of components are reduced which simplifies construction of the carriage. i:.
as the modified spring brake has the ends of each torsion spring attached directly.' thereto and also has a taper on the outside edge running all of the way around 15 the perimeter thereof.
À. ...DTD:

Claims (1)

  1. - 12 CLAIMS
    1 A torsion spring assembly comprising at lease one torsion spring mounted about a spring shaft, a carriage connected to the at least one torsion spring, axial 5 stop means and a restraining means, such that upon failure of the at least one torsion spring the carriage is moved axially with respect to the spring shaft until halted by the axial stop means at which point further rotation of the carriage and the spring shaft is prevented by the restraining means.
    10 2 An assembly according to claim 1, in which the at least one torsion spring comprises a first torsion spring and a second torsion spring in which the carriage is connected between the first torsion spring and the second torsion spring, the..
    first torsion spring, the second torsion spring and the carriage being mounted.., about the spring shaft.
    15.; 3 An assembly according to claim 1 or claim 2, in which the carriage comprises a main body portion fixed to the spring shaft and having first and.
    second radially extending flanges, the axial stop means comprises an axially I., displaceable secondary spindle having at a first part a radially extending flange, 20 in use adapted to be disposed between the first and second radially extending flanges, at second part a region having first and second radially extending regions and at a third part limiting means to limit axial movement of the second spindle, and the restraining means comprises a protrusion extending radially from and fixed axially to the spring shaft for rotation therewith such that upon failure of 25 the at least one torsion spring the carnage and the stop means are displaced axially until halted by the limiting means at which point further rotation of the carriage and the spring shaft is prevented by abutment of the protrusion and one of the first and second radially extending regions of the stop means.
    30 4 An assembly according to claim 1 or claim 2, in which the carriage comprises first and second ends between which extend a plurality of abutment means each of which being so shaped and disposed so as to provide a relatively
    - 13 narrow freedom of rotation about the spring shaft towards each end of the carriage and a relatively large freedom of rotation about the spring shaft therebetween, the restraining means comprises a protrusion extending radially from and fixed axially to the spring shaft for rotation therewith and the axial stop 5 means comprises stop elements disposed to either side of the carriage such that upon failure of the at least one torsion spring the carriage is displaced axially until halted both against axial and rotational movement by the axial stop means at which point further rotation of the spring shaft is prevented by abutment of the protrusion and one of the abutment means.
    5 An assembly according to claim 1 or claim 2, in which the axial stop means comprise stop elements disposed to either side of the carriage, and the '-
    restraining means comprises a displaceable element associated with the carriage.,; and adapted for rotation therewith, such that upon failure of the at least one 15 torsion spring the carnage is displaced axially until halted by one of the stop elements at which point abutment of the displaceable element with one of the stop elements thereby urges the displaceable element into braking contact with.; the spring shaft to prevent rotation thereof..
    20 6 An assembly according to claim 5, in which the displaceable element comprises a lever mounted within the carriage.
    7 An assembly according to claim 5, in which the displaceable element comprises a bar retained within the carriage.
    8 An assembly according to claim 6 or claim 7, in which biasing means are provided in the carriage to bias the displaceable element away from the spring shaft. 30 9 An assembly according to claim 5, in which the carriage comprises first and second end plates having a connecting structure extending therebetween, the restraining element comprising a radially displaceable element supported
    - 14 thereon, such that upon failure of the at least one torsion spring the carriage is displaced axially until halted by one of the stop elements at which point further rotation of the spring shaft Is prevented by abutment of the displaceable element with one of the stop elements thereby urging the displaceable element into 5 braking contact with the spring shaft to prevent rotation thereof.
    10 An assembly according to claim 9, in which the restraining means is formed integrally with the carriage.
    10 11 A torsion spring assembly substantially as described herein with reference to and as illustrated in any of Figures 2 to 6A of the accompanying drawings.
    12 A canopy door assembly incorporating a torsion spring assembly in., accordance with any preceding claim 15. c :',
GB0216070A 2002-07-11 2002-07-11 Improvements in and relating to an improved torsion spring assembly Expired - Fee Related GB2390640B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0216070A GB2390640B (en) 2002-07-11 2002-07-11 Improvements in and relating to an improved torsion spring assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0216070A GB2390640B (en) 2002-07-11 2002-07-11 Improvements in and relating to an improved torsion spring assembly

Publications (3)

Publication Number Publication Date
GB0216070D0 GB0216070D0 (en) 2002-08-21
GB2390640A true GB2390640A (en) 2004-01-14
GB2390640B GB2390640B (en) 2005-03-30

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Application Number Title Priority Date Filing Date
GB0216070A Expired - Fee Related GB2390640B (en) 2002-07-11 2002-07-11 Improvements in and relating to an improved torsion spring assembly

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201700004519A1 (en) * 2017-01-17 2018-07-17 Sandrini Serrande Srl Overhead door, comprising an improved balancing device and / or a parachute device and / or an improved fixing system.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2278093A (en) * 1993-05-11 1994-11-23 Birtley Building Prod Tensioner for torsion spring
WO2000006861A1 (en) * 1998-07-27 2000-02-10 Hörmann KG Brockhagen Spring monitoring device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2278093A (en) * 1993-05-11 1994-11-23 Birtley Building Prod Tensioner for torsion spring
WO2000006861A1 (en) * 1998-07-27 2000-02-10 Hörmann KG Brockhagen Spring monitoring device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201700004519A1 (en) * 2017-01-17 2018-07-17 Sandrini Serrande Srl Overhead door, comprising an improved balancing device and / or a parachute device and / or an improved fixing system.

Also Published As

Publication number Publication date
GB0216070D0 (en) 2002-08-21
GB2390640B (en) 2005-03-30

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Effective date: 20090711