US3667165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conditioning grinder
Assignee: G & B Automated Equipment Ltd
•
Filing: 1971-02-16
•
Granted: 1972-06-06
•
Expires: 1991-02-16
Abstract
Abstract A travelling carriage carrying a motor driven grinding wheel at the end of a pivoted arm reciprocates back and forth along a steel slab workpiece. A hydraulic cylinder forces the wheel down against the workpiece, this downward movement being controlled in accordance with the power being supplied to the motor and the speed of reciprocating travel of the carriage. Control of the contact pressure of the wheel is thus based on the power being absorbed by the motor, which ensures a substantially constant rate of work output by the wheel. These conditions prevail during carriage travel at normal speed. When the carriage slows down to change direction at the ends of its reciprocal travel, a mechanism sensing the carriage speed reduces the rate of work output of the grinding wheel to obtain a more constant value for the work output per unit distance of travel, the result being more uniformity in the depth of cut. Provision is made for indexing the arm transversely of the workpiece at each end of carriage travel. The maximum magnitude of the acceleration and deceleration of the carriage at the travel ends is limited in order to increase the comfort of an operator seated on the carriage. The grinding wheel peripheral speed is kept constant by a radioactive source and detector system that measures wheel diameter and speeds up the motor as the wheel wears. To facilitate this speed control a D.C. motor is used. As an alternative to a moving carriage, the structure carrying the grinding wheel can be stationary, the workpiece holder then reciprocating, the same controls over the grinding wheel pressure being exercised.
Inventors
- 👤 Philip R Mcdowell
- 👤 Charles W Vekovious
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:45
CPC Classifications
B; B24; B24B; B24B7/00; B24B7/07; B24B7/075; B24B49/00; B24B49/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
226 words
A conditioning grinder comprising a. a main structure, b. a workpiece holder, c. an arm movably mounted on said main structure, d. a grinding wheel mounted on said arm, e. displacement means acting between said structure and said arm to move the wheel in a displacement direction into and out of grinding contact with a surface of a workpiece mounted on said holder, f. an electric motor connected to the grinding wheel for driving the same, g. means for effecting relative movement between said structure and the workpiece holder in a first direction of extent of the workpiece surface to travel along the workpiece surface, said first direction being substantially perpendicular to said displacement direction, h. first sensing means for sensing the power absorbed by said motor, i. second sensing means for sensing the speed of said travel, j. and control means connected to said first and second sensing means and to said displacement mEans for moving the grinding wheel towards the workpiece surface in response to reduction of said power below a predetermined level and for moving the grinding wheel away from said workpiece surface in response to increase of said power above said predetermined level, and for reducing said predetermined level upon reduction of said speed whereby to render the work output of the grinding wheel per unit distance of travel more nearly constant.
Claim 2
Dependent Claim
226 words
A conditioning grinder comprising a. a main structure, b. a workpiece holder, c. an arm movably mounted on said main structure, d. a grinding wheel mounted on said arm, e. displacement means acting between said structure and said arm to move the wheel in a displacement direction into and out of grinding contact with a surface of a workpiece mounted on said holder, f. an electric motor connected to the grinding wheel for driving the same, g. means for effecting relative movement between said structure and the workpiece holder in a first direction of extent of the workpiece surface to travel along the workpiece surface, said first direction being substantially perpendicular to said displacement direction, h. first sensing means for sensing the power absorbed by said motor, i. second sensing means for sensing the speed of said travel, j. and control means connected to said first and second sensing means and to said displacement mEans for moving the grinding wheel towards the workpiece surface in response to reduction of said power below a predetermined level and for moving the grinding wheel away from said workpiece surface in response to increase of said power above said predetermined level, and for reducing said predetermined level upon reduction of said speed whereby to render the work output of the grinding wheel per unit distance of travel more nearly constant.
Claim 3
Dependent Claim
48 words
A grinder according to claim 1, wherein said means for effecting relative movement between the structure and the workpiece holder comprises k. means for effecting reciprocation of the grinding wheel back and forth along the workpiece between a pair of extreme positions corresponding to ends of the workpiece.
Claim 4
Dependent Claim
78 words
A grinder according to claim 2, wherein said main structure includes l. a secondary structure on which said arm is movably mounted and m. means for moving said secondary structure stepwise relative to the remainder of the main structure in a second direction of extent of the workpiece surface, said second direction being substantially perpendicular both to said first direction and to said displacement direction whereby to index the grinding wheel across the workpiece upon successive reciprocations thereof.
Claim 5
Dependent Claim
69 words
A grinder according to claim 2, wherein the workpiece holder is stationary and the main structure comprises a carriage including wheels for engaging fixed rails, the grinder further including l. a cable extending between fixed points at opposite ends of said rails, m. a capstan motor mounted on said carriage, n. and sheaves drivingly engaging the cable and driven by said capstan motor for positive driving of said carriage.
Claim 6
Dependent Claim
49 words
A grinder according to claim 4, including, o. means supplying power to said capstan motor for alternately driving the same in opposite directions for effecting said reciprocation of the grinding wheel along the workpiece, p. and means for limiting the magnitude of acceleration and deceleration of said capstan motor.
Claim 7
Dependent Claim
68 words
A grinder according to claim 2, wherein the main structure is stationary and the workpiece holder comprises a carriage including wheels for engaging fixed rails, the grinder further including l. a cable having ends connected to respective ends of said carriage, m. a capstan motor mounted on said structure, n. and sheaves drivingly engaging the cable and driven by the capstan motor for positive driving of said carriage.
Claim 8
Dependent Claim
63 words
A grinder according to claim 1, including k. third sensing means mounted on said arm for sensing the diameter of the grinding wheel, l. and further control means connected to said third sensing means and to the electric motor for increasing the rotational speed thereof inversely with said diameter whereby to maintain a substantially constant linear speed at the periphery of said wheel.
Claim 9
Dependent Claim
100 words
A grinder according to claim 7, wherein said third sensing means comprise m. a radioactive source located on one side of the wheel, n. a detector for energization by and aligned with said source on the other side of the wheel, o. means for moving said source and detector radially of the wheel, p. means connected to said detector for actuating said moving means to move the source and detector radially inwardly until the source is obscured from the detector by the grinding wheel, q. and means for transmitting the position of said moving means to said further control means.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |