Patent Grant
9303449
This invention relates generally to impact protection for overhead closures and in particular, to an overhead coiling door hood guard.
Access openings in warehouse, manufacturing and industrial settings are often secured by overhead (vertically traveling) closures.
Overhead coiling closures are, for example, slatted doors, such as rolling steel doors, which move in a generally vertical path coiling above the opening as the door is opened. Because overhead coiling closures have many fewer parts than sectional doors with less risk for damage and inoperability they often make a better solution for facilities that cannot afford opening downtime.
An overhead coiling closure is either provided with a powered operator to power the door to an open or closed position or it is manually opened and closed with, for example, a looped chain or crank. A shaft is horizontally mounted above the access opening to wind or unwind the coiling closure. The coiling shaft and operator (if present) are usually covered by a hood.
When doors are installed in high traffic areas, for example, shipping and receiving areas the hood and its contents can get damaged if struck by a fork lift transporting cargo. This damage can be caused not only by the forklift itself, but also by the cargo being trucked by the lift. If the hood or its contents become damaged the coiling closure may become non-operational with resultant access opening downtime.
Accordingly, there is still a continuing need for improved designs to protect a coiling closure hood and its contents. The present invention fulfills this need and further provides related advantages.
The disclosed invention prevents damage to a hood and its contents. For example, where the driver of a forklift is slowly traversing an access opening or simply testing passage of the opening by traversing slowly, the invention will absorb the force of a strike and automatically return to a protective position without requiring maintenance.
In a preferred embodiment, a first and second support member are mounted on either side of an access opening. A cross member is slidably retained in a protective, starting position within the support members. The cross member is preferably positioned above the access opening in front of a coiling door hood such that a striking force directed at the hood first encounters the cross member. When struck, the cross member slidably retracts against a force assembly to dissipate the striking force and upon withdrawal of the striking force the cross member returns without human intervention to the protective, starting position.
One advantage of the present invention is the reduction in access opening downtime due to damage of the overhead coiling closure from directed force strikes.
A second advantage is the automatic resetting to the protective, starting position obviating the need to restrict use of the access opening during a manual reset.
Other features and advantages of the present invention will be apparent from the following more detailed description of the preferred embodiments, taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the invention.
The accompanying drawings are included to provide a further understanding of the present invention. These drawings are incorporated in and constitute a part of this specification, illustrate one or more embodiments of the present invention, and together with the description, serve to explain the principles of the present invention.
Other features and advantages of the present invention will be apparent from the following more detailed description of the preferred embodiments, taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the invention.
As required, detailed embodiments of the present invention are disclosed; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention that may be embodied in various forms. The figures are not necessary to scale, and some features may be exaggerated to show details of particular components. Therefore, specific structural and functional details disclosed are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention. Where possible, like reference numerals have been used to refer to like parts in the several alternative embodiments of the present invention described herein.
Turning to
The guide angles 18 are conventionally mounted to the building structure 22, for example, mounted to the door jamb in conventional manner. The support bracket 12 is mounted (either as a new install or optionally retrofitted) to an adjacent coiling closure support structure, for example, a guide angle 18 to extend outward from the building structure 22. Ideally, the support bracket 12 is mounted as close as possible to the coil bracket 20 to keep the cross bar 16 above the access opening while still guarding the hood 6.
Ideally the support bracket 12 is mounted directly against and fastened to the guide angle 18, for example, by using fasteners such as a self-tapping screw 24 or a bolt 26 inserted through a mounting slot 28 utilizing washers 30 and fastened with a nut 32. Wall mounting holes 34 provide for additional attachment points to mount the support bracket 12 using, for example, wall expansion bolts. Optionally, the support bracket 12 may be welded to the guide angle 18 against which the support bracket 12 rests.
It is important when using a self-tapping screw 24 not to tap into multiple guide angles 18 as this will inhibit the movement, for example, due to thermal expansion, of the guide angles 18 during a fire emergency. When the protective hood guard 10 is installed on a fire door, the installer must not inhibit the guide angles 18 by, for example, clamping them together with screws. The guide assembly fasteners pass through a slot that is effectively large enough to allow the expansion upward (guides pushing down on the floor) during extreme heat.
As depicted in
The spring assembly 50 comprises a long bolt 52 which engages at a first end a spring clip angle 60, thereafter passing through a first set of spring washers 54, a spring 56, a second set of spring washers 54, and the cross bar 16 to engage a spring nut 58 as depicted in
During operation, when the cross bar 16 is struck by a striking force the first and second support brackets 12, 14 deflect as the cross bar 16 slides rearward within the elongated slot 40, compressing the spring 56. When the striking force is removed the spring 56 releases to return the cross bar 16 to its protective, starting position. In this manner the hood 6 and its contents are protected from being damaged.
As the cross bar 16 is struck the spring assemblies 50 compress. As the cross bar 16 deflects there will be an imbalance left or right causing the support members 12, 14 to deflect left or right depending on the imbalance of the striking force. It is not required that all three happen for successful protection of the hood 6. The severity of the force impact is determinative.
Although the present invention has been described in connection with specific examples and embodiments, those skilled in the art will recognize that the present invention is capable of other variations and modifications within its scope. These examples and embodiments are intended as typical of, rather than in any way limiting on, the scope of the present invention as presented in the appended claims.
| Number | Name | Date | Kind |
|---|---|---|---|
| 1003015 | Thomas | Sep 1911 | A |
| 1450449 | Pelosi | Apr 1923 | A |
| 2186137 | Halladay | Jan 1940 | A |
| 3746384 | Ripley | Jul 1973 | A |
| 6659158 | Laugenbach | Dec 2003 | B2 |
| 7891401 | Decola | Feb 2011 | B2 |
| 20090183842 | DeCola | Jul 2009 | A1 |
| Number | Date | Country | |
|---|---|---|---|
| 20150240557 A1 | Aug 2015 | US |
