Jerk arresting mechanism

Details Jerk arresting mechanism Jerk arresting mechanism

1995-02-24

1997-06-17

Butler, Douglas C.

Brakes

Operators

Automatic

188 67, 188265, 74 8915, 2973611, A47C 1027, E05D 1108, E05F 500

Patent

active

056389256

ABSTRACT:
The present invention relates to a jerk arresting mechanism to prevent the back rests of office chairs from unexpected movement such as rebounding and impacting upon users in an undesirable fashion. More generally, the mechanism described positively arrests an acceleration of one part moving relative to another part. This is accomplished in a housing fastened to one of the parts, wherein the mechanism resides, through which a spirally contoured shaft is passed that is connected to the other part. As the acceleration exceeds a predictable threshold, a nut with an outer toothed surface is axially translated relative to the shaft movement and engages a complementarily toothed surface integral with the housing. This engagement stops the rotational and linear movement of both the nut and shaft thereby arresting the movement of the parts relative to each other.

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