US3815470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo feed system for machine tool provided with locking mechanism
Assignee: Ateliers des Charmilles SA
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Filing: 1972-09-28
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Granted: 1974-06-11
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Expires: 1992-09-28
Abstract
Abstract A locking mechanism for a hydraulically actuated movable rod member of a machine tool, such as the electrode tool holder of an electron-erosion machining apparatus, consisting of a locking member preferably in the form of an annular expansible member surrounding a linearly and/or angularly displaceable rod member and normally biased in engagement with the surface of the rod member. The annular member is supported by a stationary element of the machine and normally engages the rod member so as to immobilize it in a predetermined position as long as the machine servo mechanism is not activated. When the machine servo mechanism is activated, pressurized fluid is introduced in a chamber dependent from the annular member, causing an expansion of the annular member releasing the rod member for normal actuation thereof by the servo mechanism.
Inventors
- 👤 T Goiffon
- 👤 H Lehmann
- 👤 H Schaidl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:35
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/20; F15B15/26; F15B15/262
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
In a servo feed mechanism providing controlled rectilinear displacement of a rod member relatively to a stationary element and to bearing means for said rod member, locking means attached to said stationary element and normally engaging said rod member for preventing rectilinear displacement of said rod member relatively to said stationary element, means for disengaging said locking means from said rod member for permitting free movement thereof relatively to said stationary element only upon actuation of the servo feed mechanism for causing controlled rectilinear displacement of said rod member relatively to said bearing means and said stationary element, wherein said locking means prevents free angular motion of said rod member when said locking means is engaged with said rod member, and means associated with said locking means for permitting controlled angular positioning of said rod member.
Claim 2
Dependent Claim
136 words
In a servo feed mechanism providing controlled rectilinear displacement of a rod member relatively to a stationary element and to bearing means for said rod member, locking means attached to said stationary element and normally engaging said rod member for preventing rectilinear displacement of said rod member relatively to said stationary element, means for disengaging said locking means from said rod member for permitting free movement thereof relatively to said stationary element only upon actuation of the servo feed mechanism for causing controlled rectilinear displacement of said rod member relatively to said bearing means and said stationary element, wherein said locking means prevents free angular motion of said rod member when said locking means is engaged with said rod member, and means associated with said locking means for permitting controlled angular positioning of said rod member.
Claim 3
Dependent Claim
43 words
The locking means of claim 1 comprising an expansible annular member disposed around said rod member, biasing means normally contracting said annular member in engagement with said rod member and means for expanding said annular member out of engagement from said rod member.
Claim 4
Dependent Claim
79 words
The locking means of claim 1 wherein the means for permitting controlled angular positioning of said rod member comprises a second annular member disposed between said expansible annular member and said stationary element, means interconnecting said expansible annular member and said second annular member for allowing expansion and contraction of said expansible annular member relatively to said second annular member while preventing angular displacement therebetween, and means for angularly adjusting said second annular member relatively to said stationary element.
Claim 5
Dependent Claim
229 words
In a fluid operated servo feed mechanism comprising a cylinder supported by a stationary element, a reciprocable piston disposed in the cylinder, a rod member attached to the piston for rectilinear displacement thereby, a bearing in at least one end of the cylinder for supporting and guiding the rod member, the piston being reciprocated as a result of a pressuRized fluid being introduced in the cylinder on one side or the other of the piston, locking means for the rod member comprising a locking member supported by said stationary element, biasing means normally urging said locking member into engagement with said rod member, means for causing said locking member to disengage from said rod member as soon as the pressure of said fluid reaches a predetermined value, wherein said locking member comprises an expansible annular member disposed around said rod member, biasing means normally contracting said annular member in engagement with said rod member, fluid operated means for expanding said annular member out of engagement from said rod member, a rigid annular member disposed between said expansible annular member and said stationary element, means interconnecting said expansible annular member and said rigid annular member for allowing expansion and control of said expansible annular member relatively to said rigid annular member while preventing angular displacement therebetween, and means for angularly adjusting said second annular member relatively to said stationary element.
Claim 6
Dependent Claim
229 words
In a fluid operated servo feed mechanism comprising a cylinder supported by a stationary element, a reciprocable piston disposed in the cylinder, a rod member attached to the piston for rectilinear displacement thereby, a bearing in at least one end of the cylinder for supporting and guiding the rod member, the piston being reciprocated as a result of a pressuRized fluid being introduced in the cylinder on one side or the other of the piston, locking means for the rod member comprising a locking member supported by said stationary element, biasing means normally urging said locking member into engagement with said rod member, means for causing said locking member to disengage from said rod member as soon as the pressure of said fluid reaches a predetermined value, wherein said locking member comprises an expansible annular member disposed around said rod member, biasing means normally contracting said annular member in engagement with said rod member, fluid operated means for expanding said annular member out of engagement from said rod member, a rigid annular member disposed between said expansible annular member and said stationary element, means interconnecting said expansible annular member and said rigid annular member for allowing expansion and control of said expansible annular member relatively to said rigid annular member while preventing angular displacement therebetween, and means for angularly adjusting said second annular member relatively to said stationary element.
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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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |