Patent US5809831A successfully refreshed from Google Patents.
US5809831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric actuator
Assignee: SMC Corp
•
Filing: 1996-07-12
•
Granted: 1998-09-22
•
Expires: 2016-07-12
Abstract
Abstract An electric actuator includes a hollow actuator housing, an electric motor connected to the hollow actuator housing, a feed screw shaft coupled to the drive shaft of the electric motor, for transmitting rotational drive power from the electric motor, and a spline tube disposed in the hollow actuator housing in surrounding relationship to the feed screw shaft and held in engagement with the feed screw shaft, for displacement axially with respect to the hollow actuator housing with the rotational drive power transmitted by the feed screw shaft. Since the feed screw shaft is surrounded by the spline tube, dust and dirt particles are prevented from being deposited on the feed screw shaft.
Inventors
- 👤 Shigekazu Nagai
- 👤 Shuuzou Sakurai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:31
CPC Classifications
F; F16; F16H; F16H25/00; H; H02; H02K; H02K7/00; H02K7/06; F16H25/18; F16H25/20; F16H2025/2062; F16H2025/2075; F16H25/22; F16H25/2204; F16H25/24; F16H25/2454; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/18712
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
An electric actuator comprising: a hollow actuator housing; an electric rotational drive power source connected to said hollow actuator housing, said electric rotational drive power source having a drive shaft; rotational drive power transmitting means comprising a feed screw shaft coupled to said drive shaft of the electric rotational drive power source, for transmitting rotational drive power from said electric rotational drive power source; and displacing means comprising a spline tube having a plurality of splines extending axially substantially from one end to another end of said spline tube, said spline tube being disposed in said hollow actuator housing in surrounding relationship to said rotational drive power transmitting means and held in engagement with said rotational drive power transmitting means, for displacement axially with respect to said hollow actuator housing with the rotational drive power transmitted by said rotational drive power transmitting means.
Claim 2
Dependent Claim
143 words
An electric actuator comprising: a hollow actuator housing; an electric rotational drive power source connected to said hollow actuator housing, said electric rotational drive power source having a drive shaft; rotational drive power transmitting means comprising a feed screw shaft coupled to said drive shaft of the electric rotational drive power source, for transmitting rotational drive power from said electric rotational drive power source; and displacing means comprising a spline tube having a plurality of splines extending axially substantially from one end to another end of said spline tube, said spline tube being disposed in said hollow actuator housing in surrounding relationship to said rotational drive power transmitting means and held in engagement with said rotational drive power transmitting means, for displacement axially with respect to said hollow actuator housing with the rotational drive power transmitted by said rotational drive power transmitting means.
Claim 3
Dependent Claim
29 words
An electric actuator according to claim 1, wherein said rotational drive power transmitting means is integrally formed coaxially with said drive shaft of the electric rotational drive power source.
Claim 4
Dependent Claim
64 words
An electric actuator according to claim 1, further comprising a drive power transmitting medium, wherein said rotational drive power transmitting means is coupled parallel to said drive shaft of the rotational drive power source through said drive power transmitting medium, said drive power transmitting medium comprising a timing belt trained around pulleys mounted respectively on said rotational drive power source and said displacing means.
Claim 5
Dependent Claim
29 words
An electric actuator according to claim 1, further comprising a sensor disposed in said hollow actuator housing for detecting return of said displacing means to an original position thereof.
Claim 6
Dependent Claim
54 words
An electric actuator according to claim 1, wherein said rotational drive power transmitting means is coupled in series to said drive shaft of the electric rotational drive power source, said spline tube being threaded over said feed screw shaft for displacement axially along said feed screw shaft upon rotation of the feed screw shaft.
Claim 7
Dependent Claim
55 words
An electric actuator according to claim 5, further comprising a boss fastened to said hollow actuator housing, wherein said spline tube has a plurality of grooves defined between said splines on an outer circumferential surface thereof, said boss engaging in said grooves for preventing said spline tube from being rotated around said feed screw shaft.
Claim 8
Dependent Claim
29 words
An electric actuator according to claim 5, further comprising a brake mechanism mounted on an end of said feed screw shaft for braking the feed screw shaft against rotation.
Claim 9
Dependent Claim
44 words
An electric actuator according to claim 5, further comprising a damper mounted on an end of said spline tube for dampening shocks at a stroke end position of the spline tube and guiding the spline tube for displacement axially along said feed screw shaft.
Claim 10
Dependent Claim
16 words
An electric actuator according to claim 8, further comprising a ring-shaped magnet fitted over said damper.
Claim 11
Dependent Claim
67 words
An electric actuator according to claim 1, wherein said hollow actuator housing has four side surfaces each having two grooves defined therein and extending axially thereof, each of said two grooves comprising an actuator mounting slot of a substantially T-shaped cross section for mounting the electric actuator on a member, and a sensor attachment slot of a substantially arcuate cross section contiguous to the actuator mounting slot.
References Cited (Backward Citations)
US2860266A
Cited
US3153948A
Cited
US3606801A
Cited
GB1352078A
Cited
US3682283A
Cited
FR2088239A1
Cited
US4082247A
Cited
US4635491A
Cited
US4739669A
Cited
FR2587690A1
Cited
FR2641424A1
Cited
US5090513A
Cited
US5488880A
Cited
EP0601185A1
Cited
US5346045A
Cited
US5269343A
Cited
DE9212073U1
Cited
US5673591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-09-21 | 2002-03-23 | 2002-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-21 | 2006-03-23 | 2006-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-21 | 2010-03-23 | 2010-09-22 | $7700.00 | Window Closed / Lapsed |