Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Patent
1977-11-14
1979-02-06
Scott, Samuel
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
254103, 74 25, 361 31, F16D 326
Patent
active
041377842
ABSTRACT:
Disclosed herein is an electromechanical actuator which acts as an analog of a fluid operated cylinder. A tubular piston moves along the axis of a fixed outer cylinder. One end of the piston is fitted with a threaded stud to which a clevis or other load attachment device can be attached. The other end of the piston, inside the outer cylinder, is attached to a coaxial drive nut. The drive nut is threaded onto a coaxial lead screw which passes through the drive nut and clears the inside of the piston. The drive nut is notched at a plurality of locations, the notches corresponding to a plurality of axially extending protrusions on the inside of the outer cylinder. Thus, when the lead screw is rotated, translational motion is imparted to the drive nut due to its inability to rotate relative to the outer cylinder. A small bar magnet is affixed to the drive nut and cooperates with an external reed switch to provide intermediate shutoff points. A double acting elastomeric spring fitted to the non-driven end of the lead screw is put in compression at either end of the piston's travel. The spring provides a gradually increasing loading on the motor which makes it feasible to use the increased motor current to sense the end of travel. Thus, the end of travel detection associated with the motor control can be carried out remote from the actuator itself, thereby allowing the use of reliable solid state electronics.
REFERENCES:
patent: 2321828 (1943-06-01), Lane
patent: 3668940 (1976-01-01), Sons
patent: 3873066 (1975-05-01), Opyrchal
patent: 3932789 (1972-06-01), Avena
patent: 4041789 (1977-08-01), Hoback
patent: 4048662 (1977-09-01), Burguburu
Anderson Geralda
Industrial Device Corporation
Scott Samuel
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