US3898911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remotely operated draw bar tool changer
Assignee: FADEL ENGINEERING Co
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Filing: 1974-08-26
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Granted: 1975-08-12
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Expires: 1994-08-26
Abstract
Abstract A remotely operated draw bar for enhancing the removal or insertion of tool holders. The draw bar contains a threaded portion at one end for connection to suitable tool holders. The other end that extends through the spindle is splined for mating with a spindle having mating splined portions. The spindle is held in a non-engaging relationship with the draw bar and is remotely operated to move in an axial direction into an engaging relationship with the draw bar. The driving motor is energized in a direction depending upon whether the tool holder is being inserted or removed. Engagement between the spline on the spindle and the splines on the draw bar is enhanced by momentarily causing the spindle to rotate as the spindle is moved from a nonengaging position to an engaging position with the draw bar. Upon being fully engaged the spindle is powered in the rotary direction depending upon the function being desired.
Inventors
- 👤 David Edward Decaussin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:17
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/24; B23B31/26; B23B31/261; B23B31/266; Y; Y10; Y10T; Y10T408/00; Y10T408/03; Y10T408/73; Y10T408/94; Y10T408/95; Y10T409/00; Y10T409/30; Y10T409/309352; Y10T409/309408; Y10T409/309464
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
141 words
A machine tool having a draw bar located in a machine head and adapted to be connected to a tool holder at one end and to a remotely operated spindle at the other end for rotating said draw bar comprising: one end of said spindle and said other end of said draw bar having interengaging means, means for moving said spindle in an axial direction from a noninterengaging position with respect to said draw bar to an interengaging position, means for automatically and slightly rotating said spindle as said spindle is moved from said non-interengaging position and before reaching said interengaging position with said draw bar, and means for automatically and fully rotating said spindle upon said spindle being interengaged with said draw bar whereby said tool holder is tightened or loosened depending upon the direction of rotation of said spindle.
Claim 2
Dependent Claim
141 words
A machine tool having a draw bar located in a machine head and adapted to be connected to a tool holder at one end and to a remotely operated spindle at the other end for rotating said draw bar comprising: one end of said spindle and said other end of said draw bar having interengaging means, means for moving said spindle in an axial direction from a noninterengaging position with respect to said draw bar to an interengaging position, means for automatically and slightly rotating said spindle as said spindle is moved from said non-interengaging position and before reaching said interengaging position with said draw bar, and means for automatically and fully rotating said spindle upon said spindle being interengaged with said draw bar whereby said tool holder is tightened or loosened depending upon the direction of rotation of said spindle.
Claim 3
Dependent Claim
37 words
A machine tool according to claim 1 in which said spindle is maintained in said non-interengaging position by means of a compression spring and air pressure moves said spindle in said interengaging position against said compression spring.
Claim 4
Dependent Claim
64 words
A machine tool according to claim 1 which includes a microswitch normally in an Off position and cam means for actuating said switch as said spindle moves in said axial direction, said cam means being operable for momentarily placing said switch in an On position and then in an Off position thereby causing said spindle to rotate before being interengaged with said draw bar.
Claim 5
Dependent Claim
42 words
A machine tool according to claim 3 in which said cam means includes a cam for placing said switch in an On position after said spindle is interengaged with said draw bar, thereby rotating said spindle while interengaged with said draw bar.
Claim 6
Dependent Claim
54 words
A machine according to claim 4 in which said cam means includes a single cam in the form of an axial shaft having suitable cutouts for momentarily operating said microswitch when said spindle is first moved in an axial direction and suitable cutouts for continuously rotating said spindle after interengagement with said draw bar.
Claim 7
Dependent Claim
119 words
A machine tool having a draw bar located in the machine head and adapted to be connected to a tool holder at one end comprising: said draw bar at the other end having interengaging portions, a spindle having complementary interengaging portions for engagement, with said draw bar, means supporting said spindle for rotation and for axial movement from a non-interengaging position to an interengaging position, means for moving said spindle from said non-interengaging position to said interengaging position whereby said spindle and said draw bar are in a driviNg relationship, and means for automatically and slightly, rotating said spindle as said spindle is moved from said non-engaging position thereby causing said spindle to rotate before reaching said interengaging position.
Claim 8
Dependent Claim
119 words
A machine tool having a draw bar located in the machine head and adapted to be connected to a tool holder at one end comprising: said draw bar at the other end having interengaging portions, a spindle having complementary interengaging portions for engagement, with said draw bar, means supporting said spindle for rotation and for axial movement from a non-interengaging position to an interengaging position, means for moving said spindle from said non-interengaging position to said interengaging position whereby said spindle and said draw bar are in a driviNg relationship, and means for automatically and slightly, rotating said spindle as said spindle is moved from said non-engaging position thereby causing said spindle to rotate before reaching said interengaging position.
Claim 9
Dependent Claim
146 words
A machine tool having a draw bar located in the machine head and adapted to be connected to a tool holder at one end comprising: said draw bar at the other end having interengaging portions, an axially moveable piston aligned with said draw bar and adapted to move axially, a spindle having complementary interengaging portions for interengaging with said draw bar rotationally supported within said piston for axial movement from a non-interengaging position to a interengaging position with said draw bar, means for moving said piston from said non-interengaging position to said interengaging position whereby said spindle and said draw bar are in a driving relationship, and means for automatically and slightly rotating said spindle as said spindle is moved from said non-interengaging position and before said spindle is moved into said interengaging position thereby causing said spindle to rotate before interengaging with said draw bar.
Claim 10
Dependent Claim
146 words
A machine tool having a draw bar located in the machine head and adapted to be connected to a tool holder at one end comprising: said draw bar at the other end having interengaging portions, an axially moveable piston aligned with said draw bar and adapted to move axially, a spindle having complementary interengaging portions for interengaging with said draw bar rotationally supported within said piston for axial movement from a non-interengaging position to a interengaging position with said draw bar, means for moving said piston from said non-interengaging position to said interengaging position whereby said spindle and said draw bar are in a driving relationship, and means for automatically and slightly rotating said spindle as said spindle is moved from said non-interengaging position and before said spindle is moved into said interengaging position thereby causing said spindle to rotate before interengaging with said draw bar.
Claim 11
Dependent Claim
180 words
A machine tool having a draw bar located in the machine head and adapted to be connected to a tool holder at one end comprising: said draw bar at the other end having a plurality of splines, a cylinder assembly completely covering and aligned with said splines, a piston located partially within said cylinder and aligned with said splined draw bar and being movable axially from a normal position to an extended position, a spindle rotationally supported within said piston for axial movement therewith from said normal position to said extended position, said spindle having a splined surface for mating with said splined draw bar in a driving relationship, means for moving said piston from said normal position to said extended position whereby said spindle and said draw bar are in said driving relationship, and means for automatically and slightly rotating said spindle as said spindle is moved from said normal position and before said spindle is moved into said driving relationship, whereby said spindle engages fully with said draw bar before full rotational power is applied to said spindle.
Claim 12
Dependent Claim
180 words
A machine tool having a draw bar located in the machine head and adapted to be connected to a tool holder at one end comprising: said draw bar at the other end having a plurality of splines, a cylinder assembly completely covering and aligned with said splines, a piston located partially within said cylinder and aligned with said splined draw bar and being movable axially from a normal position to an extended position, a spindle rotationally supported within said piston for axial movement therewith from said normal position to said extended position, said spindle having a splined surface for mating with said splined draw bar in a driving relationship, means for moving said piston from said normal position to said extended position whereby said spindle and said draw bar are in said driving relationship, and means for automatically and slightly rotating said spindle as said spindle is moved from said normal position and before said spindle is moved into said driving relationship, whereby said spindle engages fully with said draw bar before full rotational power is applied to said spindle.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |