Patent US3668813A successfully refreshed from Google Patents.
US3668813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lapping machine
Assignee: RA Stokvis & Fils
•
Filing: 1971-03-23
•
Granted: 1972-06-13
•
Expires: 1991-03-23
Abstract
Abstract In a surface lapping machine in which workpieces to be lapped are confined in rings placed on the rotatable bed of the machine, the workpiece or workpieces in each ring being loaded by a cover and the rings being retained on the bed by arms provided with rollers, the arms being disposed in star formation and forming a rotary assembly which is movable stepwise around a vertical or substantially vertical shaft disposed coaxially or substantially coaxially with the bed, while at the periphery of the bed adjacent to the stopping positions of the rings there is disposed a plane, smooth table permitting the feeding of the rings to, and the withdrawal of rings from, the bed by sliding, there is provided an articulated arm with vertical pivoting axes which is pivotally mounted on said shaft, this articulated arm carrying a vertically guided raising means engageable with said cover.
Inventors
- 👤 Jacques Barragan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:25
CPC Classifications
B; B24; B24B; B24B37/00; B24B37/34; B24B37/345
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
225 words
A surface lapping machine in which workpieces to be lapped are confined in rings placed on the rotatable bed of the machine, the workpiece or workpieces in each ring being loaded by a cover and the rings being retained on the bed by arms provided with rollers, the arms being disposed in star formation and forming a rotary assembly which is movable stepwise around a vertical or substantially vertical shaft disposed coaxially or substantially coaxially with the bed, while at the periphery of the bed adjacent to the stopping positions of the rings there is disposed a plane, smooth table permitting the feeding of the rings to, and the withdrawal of rings from, the bed by sliding, characterized in that an articulated arm with vertical pivoting axes is pivotally mounted on said shaft, which articulated arm carries a vertically or substantially vertically guided raising means adapted to be brought into engagement with said cover; and, in which the vertical guidance of the raising means is provided by at least two compass links of which the planes intersect at the axis of the said raising means, the extremity of the upper branch of each compass link being pivoted to the articulated arm and the end of the lower branch being pivoted to means engageable with the cover, all the pivoting axes being horizontal or substantially horizontal.
Claim 2
Dependent Claim
225 words
A surface lapping machine in which workpieces to be lapped are confined in rings placed on the rotatable bed of the machine, the workpiece or workpieces in each ring being loaded by a cover and the rings being retained on the bed by arms provided with rollers, the arms being disposed in star formation and forming a rotary assembly which is movable stepwise around a vertical or substantially vertical shaft disposed coaxially or substantially coaxially with the bed, while at the periphery of the bed adjacent to the stopping positions of the rings there is disposed a plane, smooth table permitting the feeding of the rings to, and the withdrawal of rings from, the bed by sliding, characterized in that an articulated arm with vertical pivoting axes is pivotally mounted on said shaft, which articulated arm carries a vertically or substantially vertically guided raising means adapted to be brought into engagement with said cover; and, in which the vertical guidance of the raising means is provided by at least two compass links of which the planes intersect at the axis of the said raising means, the extremity of the upper branch of each compass link being pivoted to the articulated arm and the end of the lower branch being pivoted to means engageable with the cover, all the pivoting axes being horizontal or substantially horizontal.
Claim 3
Dependent Claim
202 words
In a surface lapping machine for workpieces comprising a rotatable circular horizontal bed, rings for confining said workpieces on said bed, a cover in each ring for loading said confined workpieces; a vertical shaft protruding at the center of said bed; a rotary assembly having arms provided with rollers and disposed in star formation for retaining the rings on said bed in fixed position, said rotary assembly being adapted for stepwise rotation about said vertical shaft and a smooth table level with respect to said bed adapted for the feeding of a ring to and the withdrawal of the ring from the bed by sliding, the combination of a first arm portion, one end of which is pivotally carried by said shaft and a second arm portion, one end of which is pivotally carried about a vertical axis at the end of the first arm portion; electro-mechanical raising means carried by the outer part of said second arm portion, adapted to be brought into and out of engagement with said cover; guiding means for rigidly ensuring vertical displacement of said raising means; and grasping means carried by the outer end of said second arm portion for manual operation of the whole arm.
Claim 4
Dependent Claim
202 words
In a surface lapping machine for workpieces comprising a rotatable circular horizontal bed, rings for confining said workpieces on said bed, a cover in each ring for loading said confined workpieces; a vertical shaft protruding at the center of said bed; a rotary assembly having arms provided with rollers and disposed in star formation for retaining the rings on said bed in fixed position, said rotary assembly being adapted for stepwise rotation about said vertical shaft and a smooth table level with respect to said bed adapted for the feeding of a ring to and the withdrawal of the ring from the bed by sliding, the combination of a first arm portion, one end of which is pivotally carried by said shaft and a second arm portion, one end of which is pivotally carried about a vertical axis at the end of the first arm portion; electro-mechanical raising means carried by the outer part of said second arm portion, adapted to be brought into and out of engagement with said cover; guiding means for rigidly ensuring vertical displacement of said raising means; and grasping means carried by the outer end of said second arm portion for manual operation of the whole arm.
Claim 5
Dependent Claim
58 words
A machine according to claim 2, in which the means engageable with the cover comprises a disc of truncated conical shape which is freely rotatable at the lower end of the raising means and which comprises pins at its periphery which are engageable in bayonet slots provided in a crown fixed to the upper face of each cover.
Claim 6
Dependent Claim
48 words
A machine according to claim 3, in which raising of the disc is effected by a chain fixed at one of its ends to the disc, which chain passes over an idler pinion and is fixed at its other end to a pinion driven by an electric motor.
Claim 7
Dependent Claim
25 words
A machine according to claim 4, in which the driving pinion is fixed to a cam controlling at least one end of travel reversing contact.
Claim 8
Dependent Claim
71 words
A machine according to claim 4, in which the driving pinion has a pitch circle length equal to the vertical travel of the raising means and the cam acts on the same end of travel contact at the upper and lower limits of the vertical travel of the raising means, the said end of travel contact being connected to a bistable electrical device controlling the direction of rotation of the motor.
Claim 9
Dependent Claim
27 words
A machine according to claim 4, in which the end of the articulated arm carries a maneuvering handle associated with a switch for supplying the electric motor.
References Cited (Backward Citations)
US2005130A
Cited
US2559531A
Cited
US3505766A
Cited
US3487586A
Cited
US3457682A
Cited
US3570188A
Cited
US3521409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |