US3695144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo feed system for machine tool provided with locking mechanism
Assignee: Ateliers des Charmilles SA
•
Filing: 1970-08-05
•
Granted: 1972-10-03
•
Expires: 1990-08-05
Abstract
Abstract A locking mechanism for a hydraulically actuated movable rod member of a machine tool, such as the electrode tool holder of an electro-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 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
- 👤 Thierry Goiffon
- 👤 Hans Rudolf Lehmann
- 👤 Hubert Schaidl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:47
CPC Classifications
B; B23; B23Q; B23Q1/00; B23Q1/25; B23Q1/26; B23Q1/30; B23H; B23H7/00; B23H7/26; B23H7/30; B23Q1/28; F; F15; F15B; F15B15/00; F15B15/20; F15B15/26; F15B15/262
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 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 comprising an expansible annular member disposed around said rod member, biasing means peripherally disposed on said annular member for contracting said annular member for normally engaging said rod member for preventing rectilinear displacement of said rod member relatively to said stationary element, means expanding said annular member for disengaging said annular member 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, and bearing means between said locking means and said stationary element for allowing free rotation of said rod member relative to said stationary element when said locking means is engaged with said rod member.
Claim 2
Dependent Claim
160 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 comprising an expansible annular member disposed around said rod member, biasing means peripherally disposed on said annular member for contracting said annular member for normally engaging said rod member for preventing rectilinear displacement of said rod member relatively to said stationary element, means expanding said annular member for disengaging said annular member 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, and bearing means between said locking means and said stationary element for allowing free rotation of said rod member relative to said stationary element when said locking means is engaged with said rod member.
Claim 3
Dependent Claim
170 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 an expansible annular locking member surrounding said rod member and supported by said stationary element, biasing means peripherally disposed on said annular member for normally contracting said locking member into peripheral engagement with said rod member, fluid operated means for causing said locking member to expand so as to disengage from said rod member as soon as the pressure of said fluid reaches a predetermined value, and bearing means disposed between said expansible annular member and said stationary element for providing free rotational motion of said annular member.
Claim 4
Dependent Claim
170 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 an expansible annular locking member surrounding said rod member and supported by said stationary element, biasing means peripherally disposed on said annular member for normally contracting said locking member into peripheral engagement with said rod member, fluid operated means for causing said locking member to expand so as to disengage from said rod member as soon as the pressure of said fluid reaches a predetermined value, and bearing means disposed between said expansible annular member and said stationary element for providing free rotational motion of said annular member.
Claim 5
Dependent Claim
50 words
The locking means of claIm 2 wherein said fluid operated means for expanding said annular member comprises an annular groove formed on a surface of said annular member normally engaging said rod member and a passageway placing said annular groove in fluid communication with a source of said pressurized fluid.
Claim 6
Dependent Claim
160 words
In a fluid operated servo feed mechanism comprising a cylinder supported by a stationary element, a reciprocable piston disposed in the cylinder, a rotatable 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, a bearing between said locking means and said stationary element, the locking means comprising a locking member, biasing means normally urging said locking member into engagement with said rod member and means for causing said locking member to disengage from said rod member as soon as the pressure of said fluid reaches a predetermined value, whereby said rod member is locked for rectilinear displacement and free for rotation when the fluid pressure is lower than said predetermined value.
Claim 7
Dependent Claim
160 words
In a fluid operated servo feed mechanism comprising a cylinder supported by a stationary element, a reciprocable piston disposed in the cylinder, a rotatable 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, a bearing between said locking means and said stationary element, the locking means comprising a locking member, biasing means normally urging said locking member into engagement with said rod member and means for causing said locking member to disengage from said rod member as soon as the pressure of said fluid reaches a predetermined value, whereby said rod member is locked for rectilinear displacement and free for rotation when the fluid pressure is lower than said predetermined value.
Claim 8
Dependent Claim
49 words
The locking means of claim 4 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 and fluid operated means for expanding said annular member out of engagement from said rod member.
Claim 9
Dependent Claim
50 words
The locking means of claim 5 wherein said fluid operated means for expanding said annular member comprises an annular groove formed on a surface of said annular member normally engaging said rod member and a passageway placing said annular groove in fluid communication with a source of said pressurized fluid.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |