Anti-jam linear leadscrew drive and devices utilizing the drive

Details Anti-jam linear leadscrew drive and devices utilizing the drive Anti-jam linear leadscrew drive and devices utilizing the drive

1999-01-19

2000-09-26

Metjahic, Safet

Optics: image projectors

Lens support

Lens position adjustable

74841, G03B 2114

Patent

active

061234265

ABSTRACT:
A linear actuator (20) includes a frame (50) having a frame bore (52) that is threaded with an internal coarse thread (54). An antijam nut (56) is externally threaded with the coarse thread (58) and engaged to the internal coarse thread (54) of the frame bore (52) within the frame bore (52). The antijam nut (56) is also internally threaded with a fine thread (62). A first antijam nut endstop (70) is affixed to the frame (50) such that the antijam nut (56) contacts the first antijam nut endstop (70) at a first range limit within the frame bore (52). A leadscrew (64) has a first portion externally threaded with the fine thread (66) and engaged to the internal fine thread (62) of the antijam nut (56). A leadscrew support (82) is engaged to the leadscrew (64), and a rotational drive (84) is connected to the leadscrew (64). The frame (50) and the leadscrew support (82) are linearly movable relative to each other. As the leadscrew (64) turns the antijam nut (56) and the antijam nut (56) is released from the antijam nut endstop (70), the frame (50) is released from its first hard stop (69) and moved until it is stopped by the opposite endstop of the frame (50). When the leadscrew (64) is reversed, it backs the antijam nut (56) away from the first antijam nut (56) endstop, again releasing the frame (50), and the leadscrew (64) moves the frame (50) in the opposite direction until the next hard stop (69) is reached by the moving frame (50).

REFERENCES:
patent: 3293925 (1966-12-01), Linsley
patent: 4723453 (1988-02-01), Kannapan et al.
patent: 5808757 (1998-09-01), Ikeda

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