Patent US3682283A successfully refreshed from Google Patents.
US3682283A
Expired / Lapsed
US
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Motor-driven actuator and safety overload mechanism therefor
Assignee: Individual
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Filing: 1971-03-02
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Granted: 1972-08-08
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Expires: 1991-03-02
Abstract
Abstract A motor-driven actuator comprises an electric motor connected to rotationally drive a threaded shaft and a piston member in threaded engagement with the threaded shaft whereby rotation of the threaded shaft effects reciprocal movement of the piston member. A safety mechanism is incorporated into the actuator to automatically deenergize the electric motor whenever an overload condition exists thereby preventing damage to the internal components of the actuator. The safety mechanism comprises a pair of limit switches and a splined coupling interconnecting the motor output shaft and the shaft and the threaded shaft allowing axial sliding movement of, the threaded shaft to effect actuation of one of the limit switches in response to an overloading of the actuator.
Inventors
- 👤 Mitumasa Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:52
CPC Classifications
B; B23; B23Q; B23Q11/00; B23Q11/04; F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/2015; F16H25/2021; H; H02; H02K; H02K7/00; H02K7/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
184 words
An actuator comprising: means defining a housing; a piston member disposed within said housing and having means therein defining an axially extending threaded opening; mounting means mounting said piston member for reciprocal sliding movement in an axial direction within said housing and in rotational rigid relationship with respect to said housing; a rotatable threaded shaft in threaded engagement with said threaded opening; electrically energizable rotary driving means operative when energized to rotationally drive said threaded shaft in both a given rotary direction and another rotary direction opposite thereto to effect reciprocal sliding movement of said piston member; and safety means operative during rotation of said threaded shaft and in response to an external load applied to said piston member greater than a predetermined value for effecting translational movement of said rotatable threaded shaft a pre-selected distance relative to said piston member in a direction opposite to the direction of sliding movemenT of said piston member immediately before application of said external load to effect deenergization of said electrically energizable rotary driving means whereby said actuator is safely shut off whenever an overload condition exists.
Claim 2
Dependent Claim
184 words
An actuator comprising: means defining a housing; a piston member disposed within said housing and having means therein defining an axially extending threaded opening; mounting means mounting said piston member for reciprocal sliding movement in an axial direction within said housing and in rotational rigid relationship with respect to said housing; a rotatable threaded shaft in threaded engagement with said threaded opening; electrically energizable rotary driving means operative when energized to rotationally drive said threaded shaft in both a given rotary direction and another rotary direction opposite thereto to effect reciprocal sliding movement of said piston member; and safety means operative during rotation of said threaded shaft and in response to an external load applied to said piston member greater than a predetermined value for effecting translational movement of said rotatable threaded shaft a pre-selected distance relative to said piston member in a direction opposite to the direction of sliding movemenT of said piston member immediately before application of said external load to effect deenergization of said electrically energizable rotary driving means whereby said actuator is safely shut off whenever an overload condition exists.
Claim 3
Dependent Claim
88 words
An actuator according to claim 1; wherein said safety means includes means mounting said rotatable threaded shaft for axial translational movement relative to said piston member comprising a supporting piston member slidably mounted within said housing in axially spaced-apart relationship from said piston member, and means mounting said rotatable threaded shaft for rotational movement integral with said electrically energizable rotary driving means and relative to said supporting piston member and for sliding movement integral with said supporting piston member and relative to said electrically energizable rotary driving means.
Claim 4
Dependent Claim
57 words
An actuator according to claim 2; wherein said safety means includes a pin projecting outwardly from said supporting piston member and axially movable therewith, and a pair of limiting switches disposed along the path of travel of said pin on opposite sides thereof individually operative when actuated to effect deenergization of said electrically energizable rotary driving means.
Claim 5
Dependent Claim
37 words
An actuator according to claim 2; including spring means biasing said supporting piston member with a predetermined force into a normal axial position whenever a load less than said predetermined value is applied to said piston member.
Claim 6
Dependent Claim
29 words
An actuator according to claim 4; wherein said spring means comprises a pair of compression springs respectively positioned within said housing on opposite sides of said supporting piston member.
Claim 7
Dependent Claim
41 words
An actuator according to claim 4; wherein said spring means comprises a first abutting surface integral with said housing, a second abutting surface integral with said supporting piston member, and a compression spring disposed between said first and second abutting surfaces.
Claim 8
Dependent Claim
87 words
An actuator according to claim 2; wherein said means mounting said rotatable threaded shaft for rotational movement integral with said electrically energizable rotary driving means and sliding movement relative to said electrically energizable rotary driving means comprises a cylindrical member having axially extending splines disposed in circumferentially spaced-apart relationship around the interior thereof and connected for rotation with said electrically energizable rotary driving means, and complementary axially extending splines on an end portion of said rotatable threaded shaft in engagement with the splines on said cylindrical member.
Claim 9
Dependent Claim
106 words
An actuator according to claim 2; wherein said means mounting said rotatable threaded shaft for rotational movement integral with said electrically energizable rotary driving means and sliding movement relative to said electrically energizable rotary driving means comprises a cylindrical member having means therein defining a pair of axially extending opposed slots and connected for rotation with said electrically energizable rotary driving means, a pin extending through an end portion of said rotatable threaded shaft and projecting outwardly therefrom into said opposed slots, and a pair of bushings each rotatably mounted on said pin at a portion thereof wherein same projects into respective ones of said slots.
Claim 10
Dependent Claim
57 words
An actuator according to claim 1; wherein said mounting means comprises an elongated key extending axially along a portion of said housing and connected thereto, and means defining a groove in said piston member slidably accommodating therein said elongated key whereby said piston member may slide along said key but is prevented from rotating by said key.
Claim 11
Dependent Claim
38 words
An actuator according to claim 9; including means defining a plurality of axially spaced-apart apertures in said portion of said housing beneath said elongated key, and welded connections in said apertures connecting said elongated key to said housing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |