Patent US3924085A successfully refreshed from Google Patents.
Patent US3736114A successfully refreshed from Google Patents.
US3736114A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three point contact steady rest
Assignee: Toyoda Koki KK
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Filing: 1971-12-06
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Granted: 1973-05-29
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Expires: 1991-12-06
Abstract
Abstract In a steady rest for supporting a workpiece of the type comprising upper, lower and side contact shoes adapted to engage the workpiece and means for simultaneously moving the contact shoes toward and away from the workpiece, there are provided a main body of the steady rest having a bore, a sleeve rotatably received in the bore, means provided for the main body for rotating the sleeve, a rest shaft slidably contained in the sleeve, means for mounting the side contact shoe on one end of the rest shaft, means responsive to the rotation of the sleeve for axially moving the rest shaft, an upper contact shoe supporting member pivotally mounted on the main body, a lower contact shoe supporting member pivotally mounted on the main body, and means responsive to the rotation of the sleeve for pivotally rotating the upper and lower contact shoe supporting members in the opposite directions whereby the upper, lower and side contact shoes are moved simultaneously toward and away from the workpiece by the rotation of the sleeve.
Inventors
- 👤 T Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:12
CPC Classifications
B; B24; B24B; B24B41/00; B24B41/06; B24B41/065; Y; Y10; Y10T; Y10T82/00; Y10T82/25; Y10T82/2593; Y10T82/2597
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
174 words
In a steady rest for supporting a workpiece of the type comprising upper, lower and side contact shoes adapted to engage the workpiece and means for simultaneously moving said contact shoes toward and away from said workpiece, the improvement comprising a main body of the steady rest having a bore, a sleeve rotatably received in said bore, means provided for said main body for rotating said sleeve, a rest shaft slidably contained in said sleeve, means for mounting said side contact shoe on one end of said rest shaft, means responsive to the rotation of said sleeve for axially moving said rest shaft, an upper contact shoe supporting member pivotally mounted on said main body, a lower contact shoe supporting member pivotally mounted on said main body, and means responsive to the rotation of said sleeve for pivotally rotating said upper and lower contact shoe supporting members in the opposite directions whereby said upper, lower and side contact shoes are moved simultaneously toward and away from said workpiece by the rotation of said sleeve.
Claim 2
Dependent Claim
174 words
In a steady rest for supporting a workpiece of the type comprising upper, lower and side contact shoes adapted to engage the workpiece and means for simultaneously moving said contact shoes toward and away from said workpiece, the improvement comprising a main body of the steady rest having a bore, a sleeve rotatably received in said bore, means provided for said main body for rotating said sleeve, a rest shaft slidably contained in said sleeve, means for mounting said side contact shoe on one end of said rest shaft, means responsive to the rotation of said sleeve for axially moving said rest shaft, an upper contact shoe supporting member pivotally mounted on said main body, a lower contact shoe supporting member pivotally mounted on said main body, and means responsive to the rotation of said sleeve for pivotally rotating said upper and lower contact shoe supporting members in the opposite directions whereby said upper, lower and side contact shoes are moved simultaneously toward and away from said workpiece by the rotation of said sleeve.
Claim 3
Dependent Claim
28 words
The steady rest according to claim 1 wherein said main body is slidably mounted on a pilot bar and is moved along said pilot bar by driving means.
Claim 4
Dependent Claim
20 words
The steady rest according to claim 2 wherein said driving means comprises a piston-cylinder assembly located beneath said main body.
Claim 5
Dependent Claim
48 words
The steady rest according to claim 1 wherein said sleeve rotating means comprising a fluid pressure piston-cylinder assembly mounted on said main body, a rack operated by the piston of said fluid pressure piston cylinder assembly, and a pinion formed on said sleeve, said pinion meshing said rack.
Claim 6
Dependent Claim
70 words
The steady rest according to claim 1 wherein said means responsive to the rotation of said sleeve for axially moving said rest shaft comprises a plug having screw threads mating with screw threads provided on the inner surface of sleeve, means for preventing rotation of said plug but permitting axial movement thereof, an adjusting bolt extending through said plug and operatively connected to the opposite end of said rest shaft.
Claim 7
Dependent Claim
50 words
The steady rest according to claim 1 wherein said last mentioned means for operating said shoe supporting members comprises a pair of cams formed on the periphery of said sleeve, a pair of radially extending pins respectively interposed between said cams and said upper and lower contact shoe supporting members.
Claim 8
Dependent Claim
40 words
The steady rest according to claim 6 wherein said pins are operatively connected to said upper and lower contact shoe supporting members through adjusting screws, each of said adjusting screws having a tapered head engaging one end of said pin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |