Patent US3680437A successfully refreshed from Google Patents.
US3680437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Milling machine draw bar device
Assignee: Individual
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Filing: 1970-07-15
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Granted: 1972-08-01
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Expires: 1990-07-15
Abstract
Abstract There is described in the specification a manually operated drawbar device for changing the collet or cutting tool on a milling head of a milling machine. The drawbar device is lowered to engage the drawbar head with a wrench socket. The socket is rotated in either direction with a hand crank and chain drive to loosen or secure a collet or cutting tool in the milling head spindle. After loosening the drawbar head and raising the wrench socket from engagement with the drawbar head, the drawbar head is automatically impacted to ensure that the collet or tool releases readily from the spindle.
Inventors
- 👤 Mark C Cravens Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:04
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/24; B23B31/26; B23B31/261; B23B31/266; Y; Y10; Y10T; Y10T408/00; Y10T408/94; Y10T408/95; Y10T409/00; Y10T409/30; Y10T409/309352; Y10T409/309408; Y10T409/309464
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
205 words
A device for securing collets or tools to, or for removing from, the spindle of a milling machine head having a screw-type drawbar, said device comprising: a rotatable wrench socket mounted above and axially aligned with the drawbar of said milling machine, said drawbar including a turnable drawbar head connected with its upper end; holding means connected with said drawbar at its lower end and operable to secure a tool thereto; rotating means connected to said wrench socket and operable to turn said wrench socket in either direction; handle means connected with said wrench socket and operable to lower said wrench socket into engagement with said drawbar head and to raise said wrench socket out of engagement with said drawbar head; impact means positioned above said drawbar head; and release means operable connected with said handle means and operable when said handle means is in one position to prevent downward movement of said impact means and operable when said handle means is moved to another position to permit downward movement of said impact means into impacting engagement with said drawbar head, said impacting engagement of said impact means with said drawbar head being operable to tend to cause said holding means to release said tool.
Claim 2
Independent Claim
205 words
A device for securing collets or tools to, or for removing from, the spindle of a milling machine head having a screw-type drawbar, said device comprising: a rotatable wrench socket mounted above and axially aligned with the drawbar of said milling machine, said drawbar including a turnable drawbar head connected with its upper end; holding means connected with said drawbar at its lower end and operable to secure a tool thereto; rotating means connected to said wrench socket and operable to turn said wrench socket in either direction; handle means connected with said wrench socket and operable to lower said wrench socket into engagement with said drawbar head and to raise said wrench socket out of engagement with said drawbar head; impact means positioned above said drawbar head; and release means operable connected with said handle means and operable when said handle means is in one position to prevent downward movement of said impact means and operable when said handle means is moved to another position to permit downward movement of said impact means into impacting engagement with said drawbar head, said impacting engagement of said impact means with said drawbar head being operable to tend to cause said holding means to release said tool.
Claim 3
Dependent Claim
12 words
The device of claim 1 wherein the rotating means is manually actuated.
Claim 4
Independent Claim
207 words
A device for securing a collet or a tool to, or removing a collet or tool from, the spindle of a milling machine head of the type having a screw-type drawbar with turntable head, said device comprising: a stationary support means for said device positioned above said turnable head; a rotatable wrench socket; shaft means axially aligned with said drawbar and slidable in said support means to support said wrench socket; handle meaNs pivotally connected to said shaft means to move said wrench socket into engagement with said drawbar head and to move said wrench socket out of engagement with said drawbar head; rotating means rotatably connected to said wrench socket and operable to turn said wrench socket in either of opposite rotary directions; impact means positioned above said drawbar head and carried on said shaft means and axially movable therewith; resilient means operable to urge said impact means toward said drawbar head; latch means positioned to engage said shaft means and operable to hold said resilient means in compression when said handle means is moved downwardly to engage said drawbar head; and camming means operable to disconnect said latch means when said handle is moved upwardly thereby releasing said impact means to strike said drawbar head.
Claim 5
Independent Claim
207 words
A device for securing a collet or a tool to, or removing a collet or tool from, the spindle of a milling machine head of the type having a screw-type drawbar with turntable head, said device comprising: a stationary support means for said device positioned above said turnable head; a rotatable wrench socket; shaft means axially aligned with said drawbar and slidable in said support means to support said wrench socket; handle meaNs pivotally connected to said shaft means to move said wrench socket into engagement with said drawbar head and to move said wrench socket out of engagement with said drawbar head; rotating means rotatably connected to said wrench socket and operable to turn said wrench socket in either of opposite rotary directions; impact means positioned above said drawbar head and carried on said shaft means and axially movable therewith; resilient means operable to urge said impact means toward said drawbar head; latch means positioned to engage said shaft means and operable to hold said resilient means in compression when said handle means is moved downwardly to engage said drawbar head; and camming means operable to disconnect said latch means when said handle is moved upwardly thereby releasing said impact means to strike said drawbar head.
References Cited (Backward Citations)
US2994250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |