Eccentric gear backlash take-up mechanism for seat latches

Chairs and seats – Movable back – Tiltable

Patent

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Details

297362, 297379, B60N 202

Patent

active

052056090

ABSTRACT:
A vehicular seat back recliner hinge comprises first and second hinged members that are mutually rotatably arranged about a common pivot. The first member has a gear rack arranged thereon which is adapted to be engaged by a pinion spur gear. The pinion spur gear is fixed on an adjacent ratchet wheel spur gear in mutually dependent rotatable relation about a common concentric shaft secured on a second hinged member. A selected one of the above-mentioned shaft and pivot are eccentrically mounted on a rotatable bushing arranged on a corresponding one of the members. The bushing is operable to selectively position the pinion spur gear and the rack in first mutually proximal and second mutually spaced positions. A locking pawl arranged on a second of the members is adapted to lockingly engaged with and unlockingly disengage from the ratchet wheel spur gear. In this way, the backlash between the rack and pinion is reduced when the locking pawl, the ratchet wheel spur gear, the pinion spur gear, and the rack are serially engaged in mutually secured relation to resist relative rotation between the two hinged members, about their common pivot. In addition, this arrangement permits backlash to be increased between the pinion spur gear and the rack when the locking pawl is serially disengaged from the ratchet wheel spur gear, in order to ease the relative rotation of the two hinged members about their common pivot.

REFERENCES:
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patent: 4875735 (1989-10-01), Moyer et al.
patent: 4946223 (1990-08-01), Croft et al.
18 Ways to Reduce Backlash Ingearing Product Engineering Oct. 1959.

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