Rotary-to-linear actuator

Details Rotary-to-linear actuator Rotary-to-linear actuator

1999-06-02

2001-01-09

Marmor, Charles A (Department: 3681)

Machine element or mechanism

Mechanical movements

Reciprocating or oscillating to or from alternating rotary

Reexamination Certificate

active

06170346

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to rotary-to-linear actuators of the general type disclosed in U.S. Pat. No. 3,713,932, issued Jan. 30, 1973, and in U.S. Pat. No. 4,282,764 issued Aug. 11, 1981, which patents are incorporated herein by reference and which patents constitute prior art.
In U.S. Pat. No. 4,282,764, an external metallic helical hexagon thread form is employed, which thread form is required to be machined, which machining is excessively costly.
SUMMARY OF THE INVENTION
The invention provides a rotary-to-linear actuator which includes a rigid shaft having a diameter, and a plurality of rolled parallel helical grooves, and a resinous collar fabricated of low friction material and having a like plurality of corresponding spiral ridges received in the grooves, whereby one rotation of the shaft displaces the collar through a distance equal to the lead or pitch.
The invention also provides a rotary-to-linear actuator which includes a rigid shaft, and a plurality of rolled parallel helical grooves which are eight or more in number, which have a projecting face, which are generated by a straight line extending at a fixed angle respecting a plane normal to the helical axis, and which provide a lead or pitch, and a resinous collar fabricated of low friction material and including a like plurality of corresponding spiral ridges received in the grooves and reinforced by successive layers of parallel filaments helically wound over and around the low friction material and including first inner layers wound at an angle not greater than the fixed angle such that the filaments lie across the projecting faces of the spiral ridges, whereby one rotation of the shaft displaces the collar a distance which may be a multiple of the diameter of the shaft.
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings.


REFERENCES:
patent: 3461470 (1969-08-01), Cochrum
patent: 3713932 (1973-01-01), Butzow et al.
patent: 3772720 (1973-11-01), Yamamoto
patent: 3813718 (1974-06-01), Kamiya
patent: 4282764 (1981-08-01), Harris
patent: 4648285 (1987-03-01), Carson
patent: 4760635 (1988-08-01), Miller
patent: 4782688 (1988-11-01), Kawashima
patent: 4811618 (1989-03-01), Takayama
patent: 4840077 (1989-06-01), Katahira
patent: 4964314 (1990-10-01), Wilkes
patent: 5725344 (1998-03-01), Petrella

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