# US 4,396,096 A · Mechanical shock absorber

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- Number: US 4,396,096 A
- Document ID: US4396096A
- Status: Granted
- Kind: A
- Application number: 06/223,770
- Filed: 1981-01-09
- Granted: 1983-08-02
- Earliest claimed: 1978-06-10
- Assignees: LISEGA Kraftwerkstechnik GmbH & Co. KG
- Inventors: Fredrik W. de Groot; Jorg D. Bernert
- Web page: https://patentgrep.com/patent/US4396096A

## CPC

- F16L 3/202: the transverse movement being converted to a rotational movement (F16L3/215 takes precedence)
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

A shock absorber for attenuating a shock effect between a fixed point and a movable element which comprises a casing, a threaded element mounted for axial movement within the casing, and a first engagement member and a second engagement member mounted for rotary and axial movement within the casing in response to a shock effect, the first engagement member being in normal contact engagement with the threads of the threaded element for converting the axial movement of the threaded member into a rotary movement of the second engagement member and the second engagement member being adapted to engage the threads of the threaded element, whereby upon the application of the shocking effect above a predetermined amount, the second engagement member abuts against the threads of the threaded element to block further rotational movement of the second engagement member by becoming lockingly engaged with the threads of the threaded element while the shocking force is applied thereto.

## Claims

### Claim 1

A shock absorber for attenuating a shock effect between a fixed point and a movable element comprising:
a casing;
a threaded element having a longitudinal axis and being mounted for axial movement within said casing;
a first engagement means being mounted for limited radial movement relative to said longitudinal axis of said threaded element; and
a second engagement means being mounted for rotary movement within said casing and axial movement with said casing relative to said threaded element in response to a shock effect;
said first engagement means being in normal contact engagement with the threads of said threaded element for converting the axial movement of said threaded element into a rotary movement of the second engagement means and said second engagement means being normally out of engagement with the threads of said threaded element, whereby upon the application of said shocking effect above a predetermined amount, the first engagement means moves radially away from the threads of the threaded member permitting axial movement of the threaded member which abuts against the second engagement means to block further rotational movement of the second engagement means by becoming lockingly engaged with the threads of said threaded element while said shocking force is applied thereto;
said second engagement means including a body and said first engagement means being mounted in the body of said second engagement means.

### Claim 2 (depends on 1)

The shock absorber according to claim 1, wherein said first engagement means including at least one pin disposed adjacent to the periphery of said threaded element to normally engage the flank portion of said threaded element and space the flank portion of said threaded element a predetermined distance from said second engagement means, said pin being operatively positioned for rotational and radial movement.

### Claim 3 (depends on 1, 2)

The shock absorber according to claim 1 or 2, wherein said second engagement means including a spindle nut normally spaced a predetermined distance from the flank portion of said thread element.