US3721047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crush dressing control mechanism
Assignee: SHEFFIELD MACHINE TOOL COMPANY A CORP OF OH
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Filing: 1971-07-06
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Granted: 1973-03-20
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Expires: 1991-07-06
Abstract
Abstract A mechanism for controlling the infeed point at which the crush dressing sequence occurs for grinding machines including a position referencing rod slidably fitted in a base with a friction snubbing means preventing free motion therein and positioned by a driving engagement with the wheelhead during infeed motion, and an arrangement producing reduction of the wheelhead infeed to the crush feed rate after a predetermined extent of relative motion therebetween, combined with a spring biased pin slidable in the base and fixed during crush cycling, and controlling the depth of crush by an agreement which discontinues the low speed traverse after a predetermined extent of relative motion between the wheelhead and the pin, thereafter the pin being relocated on a plate carried by the position referencing rod. By this arrangement, the wheelhead returns to the point of the previous crush cycle at a rapid traverse infeed while the crush depth of each cycle remains the same.
Inventors
- 👤 Merle E Ryan
- 👤 William D Stremel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:30
CPC Classifications
B; B24; B24B; B24B49/00; B24B49/18; B23; B23Q; B23Q16/00; B23Q16/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
240 words
An improved arrangement for controlling the motion of a grinding machine wheelhead structure of the type that includes means for infeeding the grinding wheel into engagement with a dressing mechanism initially at a rapid traverse rate and then a slower dressing rate as the dresser mechanism is approachEd, the arrangement including: a rod assembly including a rod supported for a sliding motion in a base; means causing said rod assembly to be drivingly engaged with said wheelhead during its forward motion so as to be moved therewith; means for causing said wheelhead movement to shift from said rapid traverse rate to said slower dressing rate in response to a predetermined relative movement between said wheelhead and said rod assembly; means discontinuing said forward cycle motion of said wheelhead and initiating return motion thereof in response to a predetermined amount of movement of said drivingly engaged wheelhead and rod assembly said means including: an element disposed to be drivingly contacted by said drivingly engaged wheelhead and rod assembly after a predetermined extent of relative movement between said element and said wheelhead and also including locator means fixing said element during cycling movement of said wheelhead but moving said element to be located by said rod assembly position in response to said discontinuance of said forward cycle motion, whereby the extent of said rapid traverse modal movement increases after each cycle but the extent of said slow rate modal movement remains constant.
Claim 2
Dependent Claim
240 words
An improved arrangement for controlling the motion of a grinding machine wheelhead structure of the type that includes means for infeeding the grinding wheel into engagement with a dressing mechanism initially at a rapid traverse rate and then a slower dressing rate as the dresser mechanism is approachEd, the arrangement including: a rod assembly including a rod supported for a sliding motion in a base; means causing said rod assembly to be drivingly engaged with said wheelhead during its forward motion so as to be moved therewith; means for causing said wheelhead movement to shift from said rapid traverse rate to said slower dressing rate in response to a predetermined relative movement between said wheelhead and said rod assembly; means discontinuing said forward cycle motion of said wheelhead and initiating return motion thereof in response to a predetermined amount of movement of said drivingly engaged wheelhead and rod assembly said means including: an element disposed to be drivingly contacted by said drivingly engaged wheelhead and rod assembly after a predetermined extent of relative movement between said element and said wheelhead and also including locator means fixing said element during cycling movement of said wheelhead but moving said element to be located by said rod assembly position in response to said discontinuance of said forward cycle motion, whereby the extent of said rapid traverse modal movement increases after each cycle but the extent of said slow rate modal movement remains constant.
Claim 3
Dependent Claim
38 words
The arrangement of claim 1 wherein said locator means includes means biasing said element into driving engagement with said rod assembly and means releasing said element when said forward motion is discontinued and before said return motion occurs.
Claim 4
Dependent Claim
18 words
The arrangement of claim 1 including means creating a direct driving contact between said element and said wheelhead.
Claim 5
Dependent Claim
27 words
The arrangement of claim 3 wherein adjustment means is carried by said wheelhead for varying the extent of said predetermined movement causing said discontinuance of forward motion.
References Cited (Backward Citations)
US2097429A
Cited
US2969625A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |