Patent Grant
6959751
The present invention relates to a winding system. More particularly, the present invention relates to a winding system for winding a rolling door assembly, such as mini-warehouse doors, commercial rolling steel doors, and the like, for example. The present invention also relates to a rolling door assembly provided with such a winding system and to a kit for assembling the winding system.
Rolling door assemblies, such as mini-warehouse doors, commercial rolling steel doors, and the like, are very well known in the art.
These rolling door assemblies typically comprise an overhead shaft which is mounted onto a fixed structure, such as a wall for example, a drum mounted about the overhead shaft, and a door curtain foldable (i.e. wound, coiled-up, etc.) about the drum and unfoldable from the same via a rotation of the drum so as to alternatively lower and raise the curtain, i.e. operate the door. Generally, these rolling door assemblies also generally comprise at least one, but typically a pair of, counterbalancing spring(s) having ends operatively connected to corresponding parts of the assembly for providing the same with a suitable counterbalancing force. This counterbalancing force is used namely to decrease force required to open the door and also facilitate its closing.
Also known in the art are two main types of rolling door assemblies, namely “dead shaft” rolling door assemblies and “live shaft” rolling door assemblies.
A “dead shaft” rolling door assembly is one in which, after proper installation thereof, the overhead shaft is securely fixed and tightened onto the fixed structure by means of brackets and corresponding fasteners, and thus does not rotate during normal operation of the rolling door assembly. In contrast, a “live shaft” rolling door assembly is one in which, after proper installation thereof, the overhead shaft is pivotally connected to the fixed structure and rotates thereabout during normal operation of the rolling door assembly.
In the case of a “dead shaft” rolling door assembly, the drum is pivotally mounted about the overhead shaft and rotates thereabout, and each counterbalancing spring typically has first and second ends operatively connected to the shaft and drum respectively so as to be wound and unwound accordingly, depending on the operation of the door assembly, so as to provide a corresponding counterbalancing force thereto.
In the case of a “live shaft” rolling door assembly, the drum is securely mounted about the overhead shaft and rotatable therewith with respect to the fixed structure, and each counterbalancing spring typically has first and second ends operatively connected to the shaft (or drum) and fixed structure respectively so as to be wound and unwound accordingly, depending on the operation of the door assembly, so as to provide a corresponding counterbalancing force thereto.
It is also known in the art that with “live shaft” rolling door assemblies for example, the winding thereof needs to be properly calibrated in order to ensure a suitable operation of the door assembly. Typically, an installer must use a winding system having a portion which cooperates with the fixed structure onto which a corresponding end of the counterbalancing spring of the assembly is operatively connected, said portion having corresponding sockets for receiving a winding bar. The aforementioned portion of the winding system is rotated by the installer with the winding bar inserted into a corresponding socket in order to provide the counterbalancing spring with a suitable torque, such that the latter may offer a corresponding suitable counterbalancing force. A problem associated with this type of winding is that it is carried out at elevated heights, typically using a ladder, given the fact that the overhead shafts of rolling door assemblies are generally located well above ground level or well out of human reach. Another problem associated with this type of winding is that is it difficult to achieve a precise winding because the winding of the assembly results from a rough estimate of the installer manually operating the winding bar, which is used as a lever arm for winding the assembly. Another problem associated with the above-mentioned type or winding is that a considerable effort is required from the installer to carry out the above-mentioned maneuvers, often causing him to force onto the parts and causing him also to undertake very precarious movements and/or positions, which is undesirable. Another problem associated with the above-mentioned conventional winding system is that it is not provided with a safety device which would prevent the rolling door assembly and/or the winding (or “counterbalancing”) thereof from being inadvertently tampered with.
Hence, in light of the aforementioned, there is a need for an improved system and/or method for winding a rolling door assembly which would be able to overcome some of the aforementioned problems.
The object of the present invention is to provide a winding system which, by virtue of its design and components, satisfies some of the above-mentioned needs and is thus an improvement over other related winding systems and/or methods known in the prior art.
In accordance with the present invention, the above object is achieved with a winding system for winding a rolling door assembly having an overhead shaft mounted about a fixed structure and rotatable thereabout along opposite first and second directions of rotation, a drum mounted about said overhead shaft, a door curtain foldable about the drum and unfoldable from the drum via a rotation of the drum, and a counterbalancing spring having first and second ends operatively connected to the overhead shaft and the fixed structure respectively for counterbalancing the rolling door assembly, the winding system comprising:
a support bracket rigidly connectable to the fixed structure, said support bracket having receiving means and supporting means, the receiving means comprising a hub projecting from the support plate;
a first gear pivotally mounted about the hub of the receiving means of the support bracket and rotatable thereabout along opposite first and second directions of rotation, the first gear being operatively connectable to the second end of the counterbalancing spring, a portion of the overhead shaft being extendable through said first gear and said hub;
a second gear pivotally mounted about the supporting means of the support bracket and rotatable thereabout along opposite first and second directions of rotation, said second gear being threadably engaged with the first gear such that, rotation of said second gear along one of its first and second directions of rotation causes the first gear to rotate along a corresponding one of its first and second directions of rotation, thereby resulting in a corresponding winding of the counterbalancing spring of the rolling doer assembly; and
at least one spacer projecting from the support bracket said at least one spacer being positioned proximate the hub for abutting the first gear and delimiting positioning of the first gear front the support bracket, the hub comprising at least one longitudinal strip being foldable against the first gear for maintaining the first gear secured against the at least one spacer.
According to another aspect of the present invention, there is also provided a rolling door assembly having an overhead shaft mounted about a fixed structure and rotatable thereabout along opposite first and second directions of rotation, a drum mounted about said overhead shaft, a door curtain foldable about the drum and unfoldable from the drum via a rotation of the drum, and a counterbalancing spring having first and second ends operatively connected to the overhead shaft and the fixed structure respectively for counterbalancing the rolling door assembly, the rolling door assembly being provided with a winding system comprising:
a support bracket rigidly connectable to the fixed structure, said support bracket having receiving means and supporting means, the receiving means comprising a hub projecting from the support plate;
a first gear pivotally mounted about the hub of the receiving means of the support bracket and rotatable thereabout along opposite first and second directions of rotation, the first gear being operatively connected to the second end of the counterbalancing spring, a portion of the overhead shaft being extendable through said first gear and said hub;
a second gear pivotally mounted about the supporting means of the support bracket and rotatable thereabout along opposite first and second directions of rotation, said second gear being threadably engaged with the first gear such that, a rotation of said second gear along one of its first and second directions of rotation causes the first gear to rotate along a corresponding one of its first and second directions of rotation, thereby resulting in a corresponding winding of the counterbalancing spring of the rolling door assembly; and
at least one spacer projecting from the support bracket said at least one spacer being positioned proximate the hub for abutting the first gear and delimiting positioning of the first gear from the support bracket, the hub comprising at least one longitudinal strip being foldable against the first gear for maintaining the first gear secured against the at least one spacer.
According to yet another aspect of the present invention, there is also provided a kit for assembling a winding system for winding a rolling door assembly having an overhead shaft mounted about a fixed structure and rotatable thereabout along opposite first and second directions of rotation, a drum mounted about said overhead shaft, a door curtain foldable about the drum and unfoldable from the drum via a rotation of the drum, and a counterbalancing spring having first and second ends operatively connected to the overhead shaft and the fixed structure respectively for counterbalancing the rolling door assembly, the kit comprising:
a support bracket rigidly connectable to the fixed structure, said support bracket having receiving means and supporting means, the receiving means comprising a hub projecting from the support plate;
a first gear pivotally mountable about the hub of the receiving means of the support bracket and rotatable thereabout along opposite first and second directions of rotation, the first gear being operatively connectable to the second end of the counterbalancing spring, a portion of the overhead shaft being extendable through said first gear and said hub;
a second gear pivotally mountable about the supporting means of the support bracket and rotatable thereabout along opposite first and second directions of rotation, said second gear being operatively connected to the second end of the counterbalancing spring and being also threadably engaged with the first gear when the winding system is assembled such that, rotation of said first gear along one of its first and second directions of rotation causes the second gear to rotate along a corresponding one of its first and second directions of rotation, thereby resulting in a corresponding winding of the counterbalancing spring of the rolling door assembly; and
at least one spacer projecting from the support bracket, said at least one spacer being positioned proximate the hub for abutting the first gear and delimiting positioning of the first gear front the support bracket, the hub comprising at least one longitudinal strip being foldable against the first gear for maintaining the first gear secured against the at least one spacer.
The objects, advantages and other features of the present invention will become more apparent upon reading of the following non-restrictive description of preferred embodiments thereof, given for the purpose of exemplification only with reference to the accompanying drawings.
In the following description, the same numerical references refer to similar elements. The embodiments shown in the figures are preferred.
In the context of the present description, the expression “rolling door assembly” includes various types of rolling door assemblies, such as mini-warehouse doors, commercial rolling steel doors, and the like. Although the present invention was primarily designed for a live shaft rolling door assembly, it may be used with other kinds of rolling door assemblies, such as fire doors or shutters, or with any other counterbalanced door assemblies using an overhead shaft, as apparent to a person skilled in the art. For this reason, the expression “live shaft” and/or “rolling door assembly” should not be taken as to limit the scope of the present invention and includes all other kinds of doors assemblies or items with which the present invention may be used and could be useful.
Moreover, in the context of the present description, the expressions “door” and “assembly”, “curtain” and “door”, “counterbalancing shaft” and “overhead shaft”, “system” and “device”, “winding” and “counterbalancing”, as well as any other equivalent expressions and/or compound words thereof, may be used interchangeably. The same applies for any other mutually equivalent expressions, such as “plate” and “bracket” for example, as apparent to a person skilled in the art.
In addition, although the preferred embodiment of the present invention as illustrated in the accompanying drawings comprises various components such as a hub, a plug, spacer(s), strip(s), supporting arm(s), a cap, a flange, tongue(s), slit(s), a safety device, a tab, a spring, etc., and although the preferred embodiment of winding system 1 and corresponding parts of the present invention as shown consists of certain geometrical configurations as explained and illustrated herein, not all of these components and geometries are essential to the invention and thus should not be taken in their restrictive sense, i.e. should not be taken as to limit the scope of the present invention. It is to be understood, as also apparent to a person skilled in the art, that other suitable components and cooperations thereinbetween, as well as other suitable geometrical configurations may be used for the winding system 1 according to the present invention, as will be briefly explained herein and as can be easily inferred herefrom, without departing from the scope of the invention.
Broadly described, the winding system 1 according to the present invention, as exemplified in the accompanying drawings, is a winding system 1 devised for winding a rolling door assembly 3, such as mini-warehouse doors, commercial rolling steel doors, and the like, but may also be used for other types of installations where a torque must be applied onto a counterbalanced system having an overhead shaft.
The winding system 1 according to the present invention is particularly useful for winding a rolling door assembly 3 having an overhead shaft 5 mounted about a fixed structure 7 and rotatable thereabout along opposite first and second directions, corresponding respectively to a raising and a lowering of the door 9. The rolling door assembly 3 generally further comprises a drum (not shown) mounted about the overhead shaft 5 and a door curtain 9 foldable about the drum and unfoldable from the same via rotation of the drum. The rolling door assembly 3 preferably also comprise a counterbalancing spring 11 operatively connected between corresponding parts of the assembly 3 for counterbalancing the same. In the case of a “live shaft” rolling door assembly 3 for example, the counterbalancing spring 11 is operatively connected between the overhead shaft 5 (or drum for example) and a fixed structure 7 of the assembly 3 for counterbalancing the rolling door assembly 3. It is worth mentioning that, instead of using a counterbalancing spring 11, the rolling door assembly 3 according to the present invention may be counterbalanced by other suitable means, such as counterweights for example, as apparent to a person skilled in the art.
According to the present invention, and as better shown in
Preferably, the support bracket 13 is rigidly connected to the fixed structure 7, such a wall for example, by means of suitable fasteners 21, as better shown in FIG. 6. The fasteners 21 may consist of a bolt combined with other suitable complementary pieces, such as a nut, a washer, a spacer, and/or the like, as exemplified in FIG. 6 and as apparent to a person skilled in the art. In such a case, the support bracket 13 of the winding system 1 preferably acts as a wall bracket 13 for the rolling door assembly 3, as is known in the art. The support bracket 13 according to the present invention is preferably devised to have receiving means 23 for receiving the first gear 15 and supporting means 25 for supporting the second gear 17.
Indeed, as can be easily understood when referring to
As better shown in
As better shown in
The supporting means 25 also preferably comprise a cap 37 having a portion removably mountable onto the supporting arms 35 and another portion removably securable onto the support bracket 13. As better shown in
Preferably also, the winding system 1 comprises a plug 45 pivotally mounted about the overhead shaft 5, the plug 45 being used namely to operatively connect the second end 19 of the counterbalancing spring 11 to the first gear 15. The plug 45 preferably comprises a flange 47 operatively connected to the second end 19 of the counterbalancing spring 11 and connecting means 49 for removably connecting the plug 45 onto the first gear 15. The flange 47 of the plug 45 is preferably in abutment with the second end 19 of the counterbalancing spring 11, as shown in
As a protective measure, the winding system 1 preferably comprises a safety device 57 for maintaining the rolling door assembly 3 in a stable and fixed configuration, upon proper winding thereof, so as to not have to rely entirely on the worm gear assembly (e.g. first and second gears 15,17) of the winding system 1.
Indeed, as better shown in
Preferably, the safety device 57 further comprises a tab 63 extending from the pawl arm 59, said tab 63 being shaped and sized so as to cover access to the second gear 17 when the safety device 57 is in the first position, as better shown in
Preferably also, the winding system 1 comprises biasing means 65 for biasing the safety device 57 into the first position, and the biasing means 65 preferably comprise a spring 67 operatively connected between the pawl arm 59 and the support bracket 13, as better shown in FIG. 8.
As can be easily understood when contrasting FIGS. 6 and 7-9, and as aforementioned, the safety device 57 is preferably operable between first and second positions (“locked” and “unlocked” positions respectively). The first position corresponds to the configuration where the hook-shaped pawl arm 59 of the safety device 57 is interlocked with the teeth 61 of the first gear 15, as better shown in
Referring now back to
As can be easily understood, although the safety device 57 of the winding system 1 is not an essential feature thereof, it nevertheless provides the same with substantial advantages, as discussed above.
It is to be understood that several modifications could be made to the present winding system 1 according to the present invention without departing from the scope of the present invention. Indeed, as aforementioned, the biasing means 65 are operatively connected between the support bracket 13 and the safety device 57 so as to exert a biasing force for urging the pawl arm 59 of the safety device 57 into the first gear 15. The biasing means 65 preferably comprise a loaded spring member 67, capable of storing potential energy via deformation so as to provide a potential force, the spring member 67 having a first end operatively connected to the support bracket 13 and a second end operatively connected to the safety device 57. It is worth mentioning however that other suitable biasing means 65 which do not use potential energy for providing a biasing force may be used according to the present invention, so long as these biasing means 65 are capable of biasing the pawl arm 59 of the safety device 57 in a suitable way towards the first gear 15 in the manner discussed above, as apparent to a person skilled in the art.
Moreover, it is worth mentioning that the biasing means 65 may have other suitable dispositions on the winding system 1 so as to ensure a corresponding biasing force on the pawl arm 59 of the safety device 57 towards the first gear 15. It is also worth mentioning that, according to the present invention, the spring member 67 is not absolutely necessary for proper operation of the winding system 1. Indeed, the biasing means 65 may simply consist of the effect of gravity acting on the safety device 57, in which case, the pawl arm 59 and tab 63 would be positioned, shaped, and sized onto the support bracket 13 so that, by virtue of the effect of gravity acting thereon, as apparent to a person skilled in the art, it would cause the safety device 57 to be in the first position, that is, to have namely the pawl arm 59 to be engaged with the first gear 15, said pawl arm 59 being releasable from the first gear 15 preferably by using the tab 63 as a lever arm, as described above.
It is worth mentioning also though that, according to the present invention, the safety device 57 may be disposed otherwise on support bracket 13 and/or on other parts of the winding system 1, as briefly described hereinabove and as apparent to a person skilled in the art.
The winding system 1 and corresponding parts (hub 27, plug 45, spacers 31, strips 33, supporting arms 35, cap 37, a flange 43, tongues 51, slits 55, safety device 57 and corresponding pawl arm 59, tab 63, spring 67, etc.) are preferably made of substantially rigid materials, such as metallic materials (steel, etc.), hardened polymers, composite materials, and/or the like, so as to ensure a proper operation thereof depending on the particular applications for which the winding system 1 is intended and the different parameters in cause (counterbalancing force in the spring 11, weight of the door 9, number of cycles, etc.), as apparent to a person skilled in the art.
It is to be understood that other modifications could be made to the present winding system 1 according to the present invention without departing from the scope of the present invention. Indeed, as aforementioned, the safety device 57 may be shaped, positioned, and sized in such a way that the effect of gravity will act to replace the biasing force of the spring member 67. Moreover, the end 19 of the counterbalancing spring 11 may be operatively connected directly onto the first gear 15 instead of using a plug 45. Moreover, instead of being mounted onto a hub 27, the first gear 15 could be mounted onto a corresponding orifice of the support bracket 13, as apparent to a person skilled in the art. Moreover, the winding system 1 may comprise a bearing 73 operatively positioned between the hub 27 (or orifice) of the support bracket 13 and the overhead shaft 5 and/or a bearing 73 operatively positioned between the plug 45 and the overhead shaft 5, as shown in
According to another aspect of the present invention, there is provided a rolling door assembly 3 provided with the above-mentioned winding system 1.
According to another aspect of the present invention, there is also provided a kit comprising some or several of the preferred components constituting the winding system 1 according to the present invention, as exemplified in
As may now be better appreciated, the present invention is a substantial improvement and presents several advantages over devices and/or methods known on the prior art. Indeed, the present invention may be used in the garage door industry, with new door assemblies or existing door assemblies. In such cases, the present invention is devised to adjustably and precisely wind a rolling door assembly 3 without the use of a winding bar as in the case with conventional winding systems. The present invention is a compact, reliable, easy to use, easy to maintain, and cost effective system 1 for winding rolling door assemblies 3. Moreover, the present winding system 1 provides an easier way of winding rolling door assemblies 3 than what is possible with the devices and/or methods available in the prior art. Furthermore, the present invention may be used with other kinds of door assemblies 3, such as fire doors 9 and/or shutters for example, or with any other items provided with a shaft 5 requiring to be properly adjusted, rotation-wise, as aforementioned and as apparent to a person skilled in the art.
As may now be appreciated, the present invention is also a substantial improvement over the prior art in that by virtue of its safety device 57, it enables several advantages. Firstly, because the safety device 57 is biased against the first gear 15 in its first position (locked position), it enables to lock the gear in place in case of sliding between the worm gear assembly (i.e. first and second gears 15,17), thus provided with an added safety feature. Furthermore, by virtue of its design and components, namely its shielding tab 63, the safety device 57 enables to block the access to the worm assembly and assures that nobody may inadvertently wind and/or unwind the assembly 3 without previously disengaging the safety device 57 of the winding system 1.
Of course, numerous modifications could be made to the above-described embodiments without departing the scope of the invention, as defined in the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2382822 | Apr 2002 | CA | national |
| 2392417 | Jul 2002 | CA | national |
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|---|---|---|---|
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| 5964268 | Carper et al. | Oct 1999 | A |
| 6125582 | Mondragon et al. | Oct 2000 | A |
| 6263942 | Miller | Jul 2001 | B1 |
| Number | Date | Country | |
|---|---|---|---|
| 20030230389 A1 | Dec 2003 | US |
