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| Door or panel seal |
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Inflatable dock seal
| Details |
Inventors: Ouellet, Wilfred P.;
Assignee: L.K. Goodwin Co., Inc. (Providence, RI)
Primary Examiner: Chilcot, Jr.; Richard E.
Assistant Examiner:
Attorney, Agent or Firm: Salter & Michaelson
An inflatable dock seal includes inflatable top and side seal sections which are adapted to be secured to a building wall adjacent the top and side extremities of a loading dock opening therein, an inflating mechanism for inflating the top and side seal sections and a retracting mechanism for retracting the top and side seal sections when the inflating mechanism is deactuated. In one embodiment of the dock seal the retracting mechanism includes constant force springs for retracting the top and side seal sections thereof and in a second embodiment the retracting mechanism includes a constant force spring for retracting the top seal section thereof and a pair of resiliently expandable cord elements for retracting the side seal sections thereof. In both embodiments of the dock seal the side seal sections are preferably adapted to extend angularly outwardly from the respective building walls on which they are mounted and inwardly toward the respective loading dock openings thereof so that they are more effective for yieldably engaging the side surfaces of truck bodies stationed at the respective loading dock openings thereof. |
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DETAILED DESCRIPTION What is claimed: 1.
In an inflatable dock seal for a loading dock opening in a building wall, said opening having opposite side extremities and a top extremity extending between said side extremities, said dock seal including a pair of opposite side seal sections securable to said wall adjacent opposite side extremities of said opening, a top seal section securable to said wall adjacent the top extremity of said opening so that said top seal section extends between said side seal sections, each of said side seal sections and said top seal section including an inflatable portion which is inflatable to an expanded disposition and retractable to a collapsed disposition, means for inflating said inflatable portions to the expanded dispositions thereof and means for retracting said inflatable portions to the collapsed dispositions thereof upon deactuation of said inflating means, the improvement comprising said retracting means comprising substantially constant force resilient spring means for retracting at least a portion of said inflatable portions, said resilient spring means applying substantially constant, uniform retracting forces to said portion of said inflatable portions as said inflatable portions are moved between the collapsed and the expanded dispositions thereof.
2.
In the dock seal of claim 1, said spring means comprising a plurality of resilient recoil springs.
3.
In the dock seal of claim 1, said spring means comprising a pair of resilient side retracting assemblies and a resilient top retracting assembly, said side and top retracting assemblies being mounted within the inflatable portions of said side seal sections and said top seal section, respectively, and being operative for retracting said side seal sections and said top seal section, respectively.
4.
In the dock seal of claim 2, said spring means comprising a pair of side resilient recoil spring mechanisms and a top resilient recoil spring mechanisms, one of said side recoil spring mechanisms being mounted in the inflatable portion of each of said side seal sections, said top recoil spring mechanism being mounted in the inflatable portion of said top seal section
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