US3874121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Workpiece mounting apparatus for an internal grinding machine
Assignee: Toyoda Koki KK
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Filing: 1973-10-05
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Granted: 1975-04-01
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Expires: 1993-10-05
Abstract
Abstract A workpiece mounting apparatus in which a measuring gauge for measuring a cylindrical bore of a workpiece is provided with a tapered portion thereon and is fixedly mounted on a shiftable rod which in turn is slidably mounted within a spindle. The measuring gauge projects from a reference face plate on a chuck housing a predetermined amount as a result of axial movement of the shiftable rod so as to align the axis of the workpiece with the axis of the spindle. When the workpiece is clamped on the reference plate by clamping means, the tapered portion of the measuring gauge is engaged with the cylindrical bore of the workpice. Thus, axial alignment between the spindle and the workpiece is established by confirming the engagement of the tapered portion of the measuring gauge and the bore of the workpiece by means of a detector and thereafter, the tapered portion thereof is extracted from the cylindrical bore of the workpiece.
Inventors
- 👤 Makoto Kikuchi
- 👤 Ikuo Otsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:11
CPC Classifications
E; E04; E04G; E04G23/00; E04G23/08; B; B24; B24B; B24B41/00; B24B41/06; B24B41/061; B24B5/00; B24B5/02; B24B5/06; B24B5/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
256 words
An apparatus for mounting a workpiece in an internal grinding machine having a bed, a spindle head slidably mounted upon said bed, a table slidably mounted upon said bed and movable toward and away from said spindle head, and a whheel head mounted upon said table and rotatably carrying a grinding wheel, comprising: a main body of said spindle head; a spindle rotatably mounted on said main body; a chuck housing fixedly mounted on said spindle at one end thereof and provided with a reference face; clamping means axially slidably mounted within said spindle and provided for clamping the workpiece on the reference face of said chuck housing; aligning means disposed within said spindle in axial alignment therewith and having an aligning portion for establishing alignment between the axis of the workpiece and the axis of said spindle through engagement with the cylindrical bore of the workpiece when the workpiece is clamped on said reference face by means of said clamping means; a measuring gauge integrally provided on said aligning means and adapted to be snugly inserted into the cylindrical bore of the workpiece to confirm the completion of the machining operation when the bore is machined into a finished size; and positioning means mounted on said main body and capable of selectively projecting said alignment means from the one end of said chuck housing through first and second predetermined distances so as to align the workpiece with said spindle by said aligning portion and confirm the completion of the machining operation by said measuring gauge.
Claim 2
Independent Claim
256 words
An apparatus for mounting a workpiece in an internal grinding machine having a bed, a spindle head slidably mounted upon said bed, a table slidably mounted upon said bed and movable toward and away from said spindle head, and a whheel head mounted upon said table and rotatably carrying a grinding wheel, comprising: a main body of said spindle head; a spindle rotatably mounted on said main body; a chuck housing fixedly mounted on said spindle at one end thereof and provided with a reference face; clamping means axially slidably mounted within said spindle and provided for clamping the workpiece on the reference face of said chuck housing; aligning means disposed within said spindle in axial alignment therewith and having an aligning portion for establishing alignment between the axis of the workpiece and the axis of said spindle through engagement with the cylindrical bore of the workpiece when the workpiece is clamped on said reference face by means of said clamping means; a measuring gauge integrally provided on said aligning means and adapted to be snugly inserted into the cylindrical bore of the workpiece to confirm the completion of the machining operation when the bore is machined into a finished size; and positioning means mounted on said main body and capable of selectively projecting said alignment means from the one end of said chuck housing through first and second predetermined distances so as to align the workpiece with said spindle by said aligning portion and confirm the completion of the machining operation by said measuring gauge.
Claim 3
Dependent Claim
105 words
An apparatus for mounting a workpiece according to claim 1, wherein said aligning means comprises: a shiftable rod slidably mounted within said spindle and provided with said aligning portion and said measuring gauge at the one end thereof in co-axial alignment with said spindle; and wherein said positioning means comprises: a hydraulic actuator connected with said shiftable rod for regulating projected positions of said aligning portion and said measuring gauge; and spring means for urging said shiftable rod so that said mesuring gauge may be yieldably projected from the reference face of said chuck housing through said second predetermined distance determined by said hydraulic actuator.
Claim 4
Dependent Claim
95 words
An apparatus for mounting a workpiece according to claim 1, wherein said clamping means comprises: an operating member slidably mounted within said spindle in axial alignment therewith; a supporting member axially pivotably mounted on said operating member; a clamping claw pivotably mounted on said supporting member and urgingly held by means of pushing means interposed between the same and said chuck housing so as to be disengaged from the workpiece; control cylinder means operably connected with said operating member for engaging said clamping claw with the workpiece against the urging force of said pushing means.
Claim 5
Dependent Claim
81 words
An apparatus for mounting a workpiece according to claim 3, wherein said control cylinder means comprises: a cylinder integrally connected with said spindle; a piston fixedly mounted on said operating member and slidably received within said cylinder so as to move said clamping claw toward the periphery of the workpiece for clamping the same on the reference face of said chuck housing; and a rotatable distributor attached to said cylinder for introducing the fluid under pressure to axially move said piston.
Claim 6
Dependent Claim
178 words
An apparatus for mounting a workpiece according to claim 1, wherein said positioning means includes shifting means operably connected with said aligning means so as to move the same toward and away from the cylindrical bore of the workpiece and said shifting means comprises a shiftable rod slidably mounted within said spindle and operably connected with said aligning means: a receiving member rotatably journaled on said shiftable rod at the other end thereof and refrained from axial movement with respect thereto; a connecting shaft rotatably supported within said main body; a first swing arm secured to the one end of said connecting shaft and operatively connected with said shiftable rod for axially sliding the same through said receiving member; a second swing arm fixedly mounted on the other end of said connecting shaft; a pivotable arm secured on said connecting shaft for regulating the rotational movement of said first swing arm; spring means interposed between said second swing arm and said bed so as to rotatably move said second swing arm by means of the urging force thereof.
Claim 7
Dependent Claim
153 words
An apparatus for mounting a workpiece according to claim 5, wherein said positioning means further includes control means operably connected with said shifting means for controlling the advancing position of said shiftable rod and said control means comprises: a cylinder provided on said main body; a first piston and second piston slidably received within said cylinder and different from each other with respect to the area subject to the fluid under pressure; change-over valve means arranged to change the direction of fluid supplied to said cylinder and control the slidable movement of said first and second pistons; an abutment integrally connected to said second piston and protruding outwardly of said cylinder for regulating the pivoting movement of said pivotable arm through the engagement therewith in accordance with controlling of the axial movement of said second piston; and switching means provided on said main body for detecting the original position of said shiftable rod.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |