US3177775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic draw bar mechanism for machine tool spindle
Assignee: Scully-Anthony Corp
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Filing: 1963-03-28
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Granted: 1965-04-13
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Expires: 1983-03-28
Abstract
No abstract record available.
Inventors
- 👤 Edward M Alisauskis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:11
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/24; B23B31/26; B23B31/261; B23B31/265; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/309352; Y10T409/309408; Y10T409/309464
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
322 words
IN A MACHINE TOOL OF THE TYPE HAVING A TAPERED SPINDLE SOCKET ADAPTED TO RECEIVE A TOOL HOLDER HAVING A SIMILARLY TAPERED SHANK AND A KNOB MEMBER PROJECTING REARWARDLY THEREFROM, THE IMPROVEMENT COMPRISING AN AUTOMATIC DRAW BAR ASSEMBLY INCLUDING, IN COMBINATION, A SPINDLE HAVING AN AXIAL BORE THEREWIN INCLUDING A TAPERED SOCKET PORTION, A FIRST STRAIGHT CYLINDRICAL PORTION IMMEDIATELY REARWARDLY OF THE REDUCED END OF SAID TAPERED PORTION, A FRUSTO-CONICAL SHOULDER ADJACENT THE REAR END OF SAID FIRST CYLINDRICAL PORTION, AND A SECOND STRAIGHT CYLINDRICAL PORTION OF REDUCED DIAMETER RELATIVE TO SAID FIRST CYLINDRICAL PORTION AND DISPOSED IMMEDIATELY REARWARDLY OF SAID SHOULDER, A SPLIT COLLET SLIDABLE WITHIN SAID AXIAL BORE AND HAVING A PLURALITY OF RADIALLY OUTWARDLY BIASED FLEXIBLE FINGERS HAVING ENLARGED HEAD PORTION AT THE FORWARD ENDS THEREOF, EACH OF SAID ENLARGED HEAD PORTIONS HAVING A RADIALLY OUTER TAPERED SURFACE ADAPTED TO COOPERATE WITH SAID FRUSTO-CONICAL SHOULDER FOR CAMMING SAID HEAD PORTION RADIALLY INWARDLY TO A CLOSED POSITION AND EACH HEAD PORTION HAVING A RADIALLY INNER TAPERED SURFACE ADAPTED WHEN IN THE CLOSED POSITION TO ENGAGE AGAINST A REARWARDLY PROJECTING KNOB ON A TOOL HOLDER WHICH HAS BEEN INSERTED IN SAID SPINDLE SOCKET, A DRAW BAR HAVING ITS FORWARD END SECURED TO THE REAR OF SAID COLLET FOR MOVING THE LATTER AXIALLY BETWEEN A FORWARD POSITION WHEREIN SAID ENLARGED HEAD PORTIONS ARE DISPOSED FORWARDLY OF SAID FRUSTOCONICAL SHOULDER AND IN THEIR RADIALLY OUTER OPEN POSITIONS SO AS TO BEAR AGAINST SAID FIRST CYLINDRICAL PORTION AND A REARWARD POSITION WHEREIN SAID HEAD PORTIONS ARE CAMMED RADIALLY INWARDLY BY SAID SHOULDER AND ARE FREE TO MOVE AXIALLY ALONG SAID SECOND STRAIGHT CYLINDRICAL PORTION, AND MEANS FOR MOVING SAID DRAW BAR AXIALLY TO OPEN AND CLOSE SAID COLLECT WHEREBY WHEN SAID DRAW BAR IS MOVED REARWARDLY SAID COLLET WILL ENGAGE THE KNOB ON A TOOL HOLDER INSERTED IN SAID SPINDLE SOCKET AND PULL THE HOLDER AXIALLY REARWARDLY INTO A SEATED POSITION IN SAID SOCKET.
Claim 2
Dependent Claim
322 words
IN A MACHINE TOOL OF THE TYPE HAVING A TAPERED SPINDLE SOCKET ADAPTED TO RECEIVE A TOOL HOLDER HAVING A SIMILARLY TAPERED SHANK AND A KNOB MEMBER PROJECTING REARWARDLY THEREFROM, THE IMPROVEMENT COMPRISING AN AUTOMATIC DRAW BAR ASSEMBLY INCLUDING, IN COMBINATION, A SPINDLE HAVING AN AXIAL BORE THEREWIN INCLUDING A TAPERED SOCKET PORTION, A FIRST STRAIGHT CYLINDRICAL PORTION IMMEDIATELY REARWARDLY OF THE REDUCED END OF SAID TAPERED PORTION, A FRUSTO-CONICAL SHOULDER ADJACENT THE REAR END OF SAID FIRST CYLINDRICAL PORTION, AND A SECOND STRAIGHT CYLINDRICAL PORTION OF REDUCED DIAMETER RELATIVE TO SAID FIRST CYLINDRICAL PORTION AND DISPOSED IMMEDIATELY REARWARDLY OF SAID SHOULDER, A SPLIT COLLET SLIDABLE WITHIN SAID AXIAL BORE AND HAVING A PLURALITY OF RADIALLY OUTWARDLY BIASED FLEXIBLE FINGERS HAVING ENLARGED HEAD PORTION AT THE FORWARD ENDS THEREOF, EACH OF SAID ENLARGED HEAD PORTIONS HAVING A RADIALLY OUTER TAPERED SURFACE ADAPTED TO COOPERATE WITH SAID FRUSTO-CONICAL SHOULDER FOR CAMMING SAID HEAD PORTION RADIALLY INWARDLY TO A CLOSED POSITION AND EACH HEAD PORTION HAVING A RADIALLY INNER TAPERED SURFACE ADAPTED WHEN IN THE CLOSED POSITION TO ENGAGE AGAINST A REARWARDLY PROJECTING KNOB ON A TOOL HOLDER WHICH HAS BEEN INSERTED IN SAID SPINDLE SOCKET, A DRAW BAR HAVING ITS FORWARD END SECURED TO THE REAR OF SAID COLLET FOR MOVING THE LATTER AXIALLY BETWEEN A FORWARD POSITION WHEREIN SAID ENLARGED HEAD PORTIONS ARE DISPOSED FORWARDLY OF SAID FRUSTOCONICAL SHOULDER AND IN THEIR RADIALLY OUTER OPEN POSITIONS SO AS TO BEAR AGAINST SAID FIRST CYLINDRICAL PORTION AND A REARWARD POSITION WHEREIN SAID HEAD PORTIONS ARE CAMMED RADIALLY INWARDLY BY SAID SHOULDER AND ARE FREE TO MOVE AXIALLY ALONG SAID SECOND STRAIGHT CYLINDRICAL PORTION, AND MEANS FOR MOVING SAID DRAW BAR AXIALLY TO OPEN AND CLOSE SAID COLLECT WHEREBY WHEN SAID DRAW BAR IS MOVED REARWARDLY SAID COLLET WILL ENGAGE THE KNOB ON A TOOL HOLDER INSERTED IN SAID SPINDLE SOCKET AND PULL THE HOLDER AXIALLY REARWARDLY INTO A SEATED POSITION IN SAID SOCKET.
Claim 3
Dependent Claim
285 words
IN A MACHINE TOOL OF THE TYPE HAVING A TAPERED SPINDLE SOCKET ADAPTED TO RECEIVE A TOOL HOLDER HAVING A SIMILARLY TAPERED SHANK AND A KNOB MEMBER PROJECTING REARWARDLY THEREFROM, THE IMPROVEMENT COMPRISING AN AUTOMATIC DRAW BAR ASSEMBLY INCLUDING, IN COMBINATION, A SPINDLE HAVING A TAPERED SOCKET PORTION AND HAVING A STEPPED BORE DISPOSED REARWARDLY OF SAID TAPERED PORTION, A COLLET SLIDABLE AXIALLY IN SAID BORE AND ADAPTED TO COOPERATE THEREWITH WHEREBY SAID COLLET WILL BE OPENED WHEN MOVED FORWARDLY IN SAID BORE AND WILL BE CLOSED ABOUT A PROJECTING KNOB MEMBER ON A TOOL HOLDER DISPOSED IN SAID SOCKET WHEN SAID COLLET FOR MOVING REARWARDLY, A DRAW BAR SECURED TO SAID COLLET FOR MOVING THE SAME AXIALLY WHEREBY WHEN SAID DRAW BAR IS MOVED REARWARDLY SAID COLLET WILL ENGAGE THE KNOB ON A TOOL HOLDER INSERTED IN SAID SOCKET AND PULL THE HOLDER AXIALLY REARWARDLY INTO A SEATED POSITION IN SAID SOCKET, A ROTATABLE SPRING HOUSING MOUNTED OVER THE REAR END OF SAID DRAW BAR AND SUBSTANTIALLY CONCENTRIC WITH RESPECT THERETO, THRUST BEARING MEANS ASSOCIATED WITH THE FORWARD END OF SAID SPRING HOUSING TO PERMIT THE LATTER ROTATE WITH SAID DRAW BAR WHEN SAID SPINDLE IS ROTATED, COMPRESSION SPRING MEANS DISPOSED WITHIN SAID SPRING HOUSING AND ADAPTED TO ACT UPON THE REAR END OF SAID DRAW BAR TO BIAS THE LATTER TOWARDS ITS REARWARD POSITION, A STATIONARY CYLINDER MOUNTED TO A FIXED SUPPORT AND DISPOSED REARWARDLY OF SAID DRAW BAR IN AXIAL ALIGNMENT THEREWITH, AND A HYDRAULICALLY ACTUATED PISTON ASSOCIATED WITH SAID CYLINDER AND NORMALLY SPACED FROM THE REAR END OF SAID DRAW BAR, SAID PISTON BENG ADAPTED UPON ACTUATION TO ENGAGE SAID DRAW BAR AND MOVE THE SAME FORWARDLY TO OPEN SAID COLLET.
Claim 4
Dependent Claim
285 words
IN A MACHINE TOOL OF THE TYPE HAVING A TAPERED SPINDLE SOCKET ADAPTED TO RECEIVE A TOOL HOLDER HAVING A SIMILARLY TAPERED SHANK AND A KNOB MEMBER PROJECTING REARWARDLY THEREFROM, THE IMPROVEMENT COMPRISING AN AUTOMATIC DRAW BAR ASSEMBLY INCLUDING, IN COMBINATION, A SPINDLE HAVING A TAPERED SOCKET PORTION AND HAVING A STEPPED BORE DISPOSED REARWARDLY OF SAID TAPERED PORTION, A COLLET SLIDABLE AXIALLY IN SAID BORE AND ADAPTED TO COOPERATE THEREWITH WHEREBY SAID COLLET WILL BE OPENED WHEN MOVED FORWARDLY IN SAID BORE AND WILL BE CLOSED ABOUT A PROJECTING KNOB MEMBER ON A TOOL HOLDER DISPOSED IN SAID SOCKET WHEN SAID COLLET FOR MOVING REARWARDLY, A DRAW BAR SECURED TO SAID COLLET FOR MOVING THE SAME AXIALLY WHEREBY WHEN SAID DRAW BAR IS MOVED REARWARDLY SAID COLLET WILL ENGAGE THE KNOB ON A TOOL HOLDER INSERTED IN SAID SOCKET AND PULL THE HOLDER AXIALLY REARWARDLY INTO A SEATED POSITION IN SAID SOCKET, A ROTATABLE SPRING HOUSING MOUNTED OVER THE REAR END OF SAID DRAW BAR AND SUBSTANTIALLY CONCENTRIC WITH RESPECT THERETO, THRUST BEARING MEANS ASSOCIATED WITH THE FORWARD END OF SAID SPRING HOUSING TO PERMIT THE LATTER ROTATE WITH SAID DRAW BAR WHEN SAID SPINDLE IS ROTATED, COMPRESSION SPRING MEANS DISPOSED WITHIN SAID SPRING HOUSING AND ADAPTED TO ACT UPON THE REAR END OF SAID DRAW BAR TO BIAS THE LATTER TOWARDS ITS REARWARD POSITION, A STATIONARY CYLINDER MOUNTED TO A FIXED SUPPORT AND DISPOSED REARWARDLY OF SAID DRAW BAR IN AXIAL ALIGNMENT THEREWITH, AND A HYDRAULICALLY ACTUATED PISTON ASSOCIATED WITH SAID CYLINDER AND NORMALLY SPACED FROM THE REAR END OF SAID DRAW BAR, SAID PISTON BENG ADAPTED UPON ACTUATION TO ENGAGE SAID DRAW BAR AND MOVE THE SAME FORWARDLY TO OPEN SAID COLLET.
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) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |