US3633457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for securing and releasing of worktools in a worktool machine spindle
Assignee: Friedrich Deckel AG
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Filing: 1969-10-06
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Granted: 1972-01-11
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Expires: 1989-10-06
Abstract
Abstract Electric motor and gearing means for securing and releasing of worktools in the spindle of a machine tool. The motor drives through suitable reduction gearing a planet carrier which is connected simultaneously to two sun gears. One sun gear is connected to a drawbar for screwing and unscrewing same into and off from the tool. The other sun gear is connected to means responding to rotation of said last-named sun gear for applying sufficient tension to said drawbar to set its threads with sufficient force against the threads of the tool to assure against accidental unscrewing of such tool from the drawbar. The parts are arranged so that the first-mentioned sun gear operates to apply said tensioning force sufficient to prevent unscrewing of said tool from the drawbar. Release of the tool is accomplished first by releasing said tensioning force following by unscrewing of the drawbar from the tool.
Inventors
- 👤 Rudolf Reeber
- 👤 Horst Lanzenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:26
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/24; B23B31/26; B23B31/261; B23B31/266; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/309352; Y10T409/309408; Y10T409/309464
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
270 words
A device for securing and releasing of work tools with respect to the spindle of a machine tool in response to a rotative movement in respectively opposite directions by a source of rotative force, comprising in combination: a work tool driving spindle mounted for rotation and connectable to means for driving same; a drawbar extending centrally through said spindle and provided with threaded means for attachment to a tool; a planet gear carrier carrying planet gears thereon and mounted for rotation and means associating said source of rotative force with said planet gear carrier for driving said planet gear carrier; a pair of sun gears mounted for rotation independently of each other but in mesh with said planet gears for operation of both thereby; means connecting said drawbar to one of said sun gears for rotation thereby; releasable bias means for applying an axial load onto said drawbar; load means responsive to rotation of the other of said sun gears for releasing said axial load of said releasable bias means upon a rotation of said other of said sun gears in a first direction; limit means limiting the amount of movement of said load means in the direction of applying or releasing of said axial load; the said load means normally having an internal resistance that upon initial rotation of said planet gear carrier, said other of said sun gears will rotate first in said first direction to move said load means against said limit means to release said axial load of said releasable bias means after which said one of said sun gears will rotate to release said tool.
Claim 2
Independent Claim
270 words
A device for securing and releasing of work tools with respect to the spindle of a machine tool in response to a rotative movement in respectively opposite directions by a source of rotative force, comprising in combination: a work tool driving spindle mounted for rotation and connectable to means for driving same; a drawbar extending centrally through said spindle and provided with threaded means for attachment to a tool; a planet gear carrier carrying planet gears thereon and mounted for rotation and means associating said source of rotative force with said planet gear carrier for driving said planet gear carrier; a pair of sun gears mounted for rotation independently of each other but in mesh with said planet gears for operation of both thereby; means connecting said drawbar to one of said sun gears for rotation thereby; releasable bias means for applying an axial load onto said drawbar; load means responsive to rotation of the other of said sun gears for releasing said axial load of said releasable bias means upon a rotation of said other of said sun gears in a first direction; limit means limiting the amount of movement of said load means in the direction of applying or releasing of said axial load; the said load means normally having an internal resistance that upon initial rotation of said planet gear carrier, said other of said sun gears will rotate first in said first direction to move said load means against said limit means to release said axial load of said releasable bias means after which said one of said sun gears will rotate to release said tool.
Claim 3
Dependent Claim
26 words
A device according to claim 1, wherein said load means comprises a screw thread connection between said limit means and said other of said sun gears.
Claim 4
Dependent Claim
68 words
A device according to claim 1, wherein said load means includes casing means having an internally threaded portion thereon and a sleeve secured to said spindle having an externally threaded portion thereon engaged with said internally threaded portion of said casing means; including coupling means for coupling said casing means to said other of said sun gears for rotative movement therewith while permitting a relative longitudinal movement therebetween.
Claim 5
Dependent Claim
38 words
A device according to claim 3, wherein said drawbar includes stop means on the end thereof adjacent said connecting means; and wherein said releasable bias means includes a spring mounted between said casing means and said stop means.
Claim 6
Dependent Claim
73 words
A device according to claim 4, wherein said connecting means includes a splined connection betwEen said one of said sun gears and said drawbar whereby a rotation of said one of said sun gears and said drawbar will cause said drawbar to move toward said spring to compress said spring between said stop means and said casing means and to thereby tighten said tool onto said spindle to secure said tool against release.
Claim 7
Dependent Claim
37 words
A device according to claim 3, wherein said limit means includes a pin secured to said casing means and extending away therefrom and a recess provided in said sleeve for receiving the free end of said pin.
Claim 8
Dependent Claim
26 words
A device according to claim 1, wherein said one of said sun gears has a lesser number of teeth than said other of said sun gears.
Claim 9
Dependent Claim
104 words
A device according to claim 1, wherein said source of rotative force includes means defining an electric motor having a stator and a rotor coaxial therewith, said stator being arranged coaxially of and connected to said spindle; including transmission means for connecting said rotor to said sun gears; and wherein said transmission means includes at least a pair of reversing gears rotatably supported on shafts and drivingly coupled between said rotor and said planetary gear carrier; said reversing gear being drivingly connected to said rotor on diametrically opposite sides thereof whereby the moments of inertia on said shafts supporting said reversing gears are equal.
Claim 10
Dependent Claim
28 words
A device according to claim 8, including a rotating disk secured to said rotor, said disk having symmetrically arranged bores arranged therein for balancing said moment of inertia.
Claim 11
Dependent Claim
14 words
A device according to claim 8, wherein said shafts are secured to said spindle.
References Cited (Backward Citations)
US3254567A
Cited
US3220313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |