Vehicle fenders – Buffer or bumper type – Bumper having impact force absorbing means directly...
Patent
1981-08-25
1984-01-17
Butler, Douglas C.
Vehicle fenders
Buffer or bumper type
Bumper having impact force absorbing means directly...
137 68R, 188289, 188317, 188376, 267 6415, 267139, 267116, A47C 714, F16F 100, F16F 300
Patent
active
044261098
ABSTRACT:
An improved shear-type pressure relief device is provided which is useful in conjunction with pressure chambers requiring relief when system pressures exceed a predetermined level, such as in the shock absorbing piston and cylinder assemblies of present day vehicle bumpers. The relief device is preferably in the form of an integral, metallic body including a flange in engagement with a pressure chamber wall adjacent a relief opening, with a projection extending into the opening. The juncture between the flange and projection is advantageously very sharp (having a radius of less than about 0.020 inches) and the device is designed to shear upon experiencing high system pressures for relief purposes. In the case of vehicle bumpers the shear device is located on the shiftable, bumper-mounted piston thereof, and circumscribes the usual stationary, tapered, frame-mounted, flow-restricting rod. In this manner the normal operation of the bumper under moderate impact loads remains unaffected, whereas in the case of high impact loads the system pressures shear the device and provide a degree of shock absorption not found in conventional bumpers.
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Butler Douglas C.
Fike Metal Products Corporation
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