High-absorption bumper device for vehicles

US4262778A · kind A · utility

Assignee

• Ugine Aciers · FR

Inventor

• Francois Flusin · Paris, FR

Key dates

• Filing date: May 2, 1979
• Grant date: Apr 21, 1981
• Expiry date: May 2, 1999

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60R19/32
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

PCT No. PCT/FR78/00007 Sec. 371 Date May 2, 1979 Sec. 102(e) Date May 2, 1979 PCT Filed Jul. 7, 1978 PCT Pub. No. WO79/00124 PCT Pub. Date Mar. 22, 1979 The bumper device which is the object of the invention relates principally to the absorption of high energy impacts which can be sustained by all types of moving bodies or vehicles and in particular by cars. In its preferred embodiment, the device comprises one or more capacities usually arranged at the front of the vehicle and containing a hydraulic fluid. Each of these capacities is connected by a pipe to a receiving chamber which can be deformed by expansion and is also filled with fluid. Under the influence of a violent impact, these capacities crush and eject the fluid which they contain towards the receiving chambers, the walls of which dilate in proportion to the entry of the fluid. The plastic deformation of these walls absorbs the energy of the impact. This device is more particularly suited to the production of high absorption bumpers for cars and preferably comprises receiving chambers made of austenitic steel with unstable austenite.