Telescoping energy absorber with pressure relief valve capsule

Abstract From the Canadian patent

Abstract of the Disclosure, An energy absorber unit having inner and outer telescoping cylinders with a pressure relief valve capsule retained in a centralized opening in or forming an integral part of the cylinder cap to control the flow of fluid between contractible and expandable fluid chambers in the unit. The valve capsule being load-sensitive maintains a substantially constant pressure in the unit so that unit stroke is proportional to impact velocity. With this construction, the corners of vehicle bumpers experience a reduced swing arc as compared to velocity sensitive units so that clearance between bumper corners and vehicle body work can be reduced. On rebound return spring means …