F - Mech Eng,Light,Heat,Weapons – 16 – F
Patent
F - Mech Eng,Light,Heat,Weapons
16
F
267/85
F16F 9/16 (2006.01) B60R 19/32 (2006.01)
Patent
CA 1192234
SHEAR TYPE PRESSURE RELIEF DEVICE FOR HYDRAULIC ENERGY ABSORPTION UNIT Abstract of the Disclosure 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. The flange should be of sufficient thickness to provide stability across its unsupported dimension. However, if the shear and yield relationship of the material from which a relief device of preferred configuration is formed are such that yield could take place before shear, then it is desirable that the flange of the device be of a lesser sized cross sectional area adjacent to the sharp juncture between the flange and projection to assure shearing before significant yield occurs at a predetermined pressure level. In the case of vehicle bumpers the shear device is located on the shiftable, bumper-mounted piston thereof, and circumscribes the usual station- ary, 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.
409967
Fike Metal Products Corporation
Gowling Lafleur Henderson Llp
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