Land vehicles – Wheeled – Running gear
Patent
1984-10-22
1986-12-30
Bertsch, Richard A.
Land vehicles
Wheeled
Running gear
180 78, 280750, B60R 2102
Patent
active
046324240
ABSTRACT:
An apparatus for absorbing energy between movable members. The apparatus includes first and second telescopingly engagable members. The second member is formed to be increasingly and forceably engaged with the first member as an external force is exerted on the second member urging it into the second member. In a preferred embodiment, a helical twist is formed in the second member to cause the forced engagement of the first and second members. The helical twist is variable over the longitudinal length of the second member from a first end and increases gradually from the first end to an intermediate portion an then increasingly from the intermediate portion outward towards the second end of the second member. This provides a controlled forced rate build up as the second member is urged into the first member to control energy absorption of the force urging the second member into the first member. In an alternate embodiment, the second member is formed with knurlings on opposed surfaces of varying and increasing depth from the first end to cause the increasing forced engagement of the second member into the first member.
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