Patent US3698729A successfully refreshed from Google Patents.
US3698729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power operated clamping device for machine tools
Assignee: Forkardt Deutschland GmbH
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Filing: 1971-02-17
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Granted: 1972-10-17
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Expires: 1991-02-17
Abstract
Abstract A power operated clamping device for machine tools in which a chuck body having radially moveable jaws is mounted on one end of a spindle while an oscillatory fluid motor is mounted on the other end of the spindle. Actuating blocks on the chuck body are connected to the motor and engage the jaws and move the jaws positively when the motor is actuated. When the motor is turned beyond a certain limit, the blocks disengage from the jaws while simultaneously a control system is actuated to prevent rotation of the spindle.
Inventors
- 👤 Hans Scharfen
- 👤 Josef Steinberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:17
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/16; B23B31/16045; B23B31/16066; B23B31/1607; Y; Y10; Y10T; Y10T279/00; Y10T279/12; Y10T279/1208; Y10T279/19; Y10T279/1926; Y10T279/1946; Y10T279/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
224 words
In a chucking device for a machine tool, a hollow spindle, a chuck body on one end of the spindle having jaw means guided for radial movement thereon, an actuating wedge block adjacent each jaw means and guided substantially tangentially on said body for movement in a direction at an angle to the direction of movement of the respective jaw means, inclined interengaging teeth on each jaw means and the respective actuating block operable to cause radial movement of said jaw means in response to reciprocal movement of said actuating wedge blocks, each actuating wedge block having rock teeth on the side facing the axis of said spindle, a drive gear co-axial with the spindle and meshing with said rock teeth, a rotating tube in the hollow spindle drivingly engaging said gear, an oscillating fluid motor carried by said spindle at the end opposite said chuck body and having a vane connected directly to said tube for reversible rotation thereof to move said jaw means radially on said chuck body, a pressure fluid conveying housing adjoining said fluid motor, a pivot portion carrying said pressure fluid conveying housing and connected to said vane, and means operatively connected with said motor for control thereof and adapted for actuation in response to movement of said vane beyond a predetermined rotational limit in at least one direction.
Claim 2
Dependent Claim
224 words
In a chucking device for a machine tool, a hollow spindle, a chuck body on one end of the spindle having jaw means guided for radial movement thereon, an actuating wedge block adjacent each jaw means and guided substantially tangentially on said body for movement in a direction at an angle to the direction of movement of the respective jaw means, inclined interengaging teeth on each jaw means and the respective actuating block operable to cause radial movement of said jaw means in response to reciprocal movement of said actuating wedge blocks, each actuating wedge block having rock teeth on the side facing the axis of said spindle, a drive gear co-axial with the spindle and meshing with said rock teeth, a rotating tube in the hollow spindle drivingly engaging said gear, an oscillating fluid motor carried by said spindle at the end opposite said chuck body and having a vane connected directly to said tube for reversible rotation thereof to move said jaw means radially on said chuck body, a pressure fluid conveying housing adjoining said fluid motor, a pivot portion carrying said pressure fluid conveying housing and connected to said vane, and means operatively connected with said motor for control thereof and adapted for actuation in response to movement of said vane beyond a predetermined rotational limit in at least one direction.
Claim 3
Dependent Claim
73 words
A chucking device according to claim 1, in which said control means comprise an axial control pin carried by and rotatable with said motor and spring urged in one direction, at least one radial pin element carried by said pivot portion, and cam track means engageable by said radial pin element when said motor moves beyond said predetermined rotational limit and operable to move said axial control pin against the spring bias thereon.
Claim 4
Dependent Claim
27 words
A chucking device according to claim 2, in which said cam track means is in the form of an arcuate recess having at least one inclined end.
Claim 5
Dependent Claim
76 words
A chucking device according to claim 1, in which there are pin means comprising inclined means at the end nearest said motor, cam actuator means comprising radial plunger means having an inner end engaging the inclined means on said pin means and rotatable with said motor, and stationary cam track means engaging the outer end of said plunger means operablE for moving the plunger means radially inwardly when said motor moves beyond said predetermined rotational limit.
Claim 6
Dependent Claim
80 words
A chucking device according to claim 1, in which said control means includes three axially movable control pin means carried by said spindle and spring biased in one direction, cam actuator means operated by said motor and operatively engageable with said pin means when said motor moves beyond said predetermined rotational limit so as to move said pin means against the spring bias acting thereon, and switch means adapted for actuation in response to said movement of said pin means.
Claim 7
Dependent Claim
37 words
A chucking device according to claim 1, in which said drive gear has a splined central bore and said tube connected directly to said vane has a splined end axially telescopically engaging the splines in said bore.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |