| 摘要 |
In accordance with the present invention, the traction device 10 includes mounting plate assembly 30, and cleats 40. Mounting assembly 30 comprises plate 31 and center ring 35. Plate 31 and center ring 35 are made of steel aluminum alloy or other heavy-duty material capable of withstanding the stresses to be encountered during the application of the invention. Tabs 32 are part of plate 30. As an example they may be formed by bending and folding material up 90 degrees from the plate surface during the manufacturing process. Center ring 35 fits down over and is welded to tabs 32 such that after assembly, holes 37 in center ring 35 will match holes 38 in tabs 32.Each cleat 40 is a single piece of steel or another heavy-duty material capable of withstanding the stresses expected to be encountered during the application of the invention. Cleats 40 are manufactured such that a portion of each cleat 40 is bent and folded to form a gripping element 41. Each cleat 40 is assembled to mounting plate 30 with bolt 42, compression spring 48, washer 47, and nut 49. Handles 45 are attached to cleats 40 by welded studs 53. Bolts 42, compression springs 48, washers 47, and nuts 49 are off-the-shelf items available at any hardware store or building supply house. Handles 55 can be made of metal, plastic, or any other suitable material. They are commonly available items found in hardware stores or building supply houses, or manufactured especially for this application.
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