US3631945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed-changing device for a rotary member
Assignee: Olivetti SpA
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Filing: 1970-06-02
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Granted: 1972-01-04
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Expires: 1990-06-02
Abstract
Abstract A speed-changing device for a machine tool spindle comprises two driven gears of different diameters secured to the spindle, two driving gears for meshing with respective ones of the driven gears and angularly fixed relative to each other, the spindle being orientable in a predetermined angular position. The driving gears are axially slidable with respect to the driven gears for selecting which of the two pairs of driven and driving gears is in mesh. The gear ratios are such and the fixed angular relationships between the driven gears and between the driving gears are such that one gear of each said pair has a tooth aligned exactly with a space of the other gear of the pair. The two driving gears have an overall axial length greater than the axial clearance between the other two gears whereby, when changing speed, one pair of gears commences to mesh before the other pair has ceased to mesh.
Inventors
- 👤 Giorgio Ollearo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:21
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H2708/00; F16H2708/10; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/19279; Y10T74/19293; Y10T74/19298; Y10T74/19326
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
A speed-changing device comprising a driven rotary member carrying two driven gears angularly fixed to said rotary member and having different diameters, two driving gears for meshing with respective ones of the driven gears and angularly fixed relative to each other, means for orienting said rotary member in a predetermined angular position when said driving gears are stationary, and means for producing a relative axial shifting between said driving gears and said driven gears for selecting which pair of associated driven and driving gears is in mesh, the gear ratios being such and the fixed angular relationships between the driven gears and between the driving gears being such that, when the rotary member 13 is oriented in the predetermined angular position, one gear of each said pair has a tooth aligned exactly with a space of the other gear of the pair.
Claim 2
Dependent Claim
142 words
A speed-changing device comprising a driven rotary member carrying two driven gears angularly fixed to said rotary member and having different diameters, two driving gears for meshing with respective ones of the driven gears and angularly fixed relative to each other, means for orienting said rotary member in a predetermined angular position when said driving gears are stationary, and means for producing a relative axial shifting between said driving gears and said driven gears for selecting which pair of associated driven and driving gears is in mesh, the gear ratios being such and the fixed angular relationships between the driven gears and between the driving gears being such that, when the rotary member 13 is oriented in the predetermined angular position, one gear of each said pair has a tooth aligned exactly with a space of the other gear of the pair.
Claim 3
Dependent Claim
45 words
A device according to claim 1, wherein said two driving gears have an overall axial length greater than the axial clearance between the other two gears whereby, when changing speed, one pair of gears commences to mesh before the other pair has ceased to mesh.
Claim 4
Dependent Claim
46 words
A device according to claim 1, wherein the transmission ratio of one of the pairs of gears is a whole multiple of the transmission ratio of the other pair, the numbers of teeth on all said gears being whole multiples of the first said whole multiple.
Claim 5
Dependent Claim
35 words
A device according to claim 1, wherein said driven gears are fixed axially as well as angularly relative to said rotary member and said two driving gears are integral to each other and slidable axially.
Claim 6
Dependent Claim
38 words
A device according to claim 4, wherein said driving gears are themselves driven by a pinion fixed on a driving shaft, said pinion having such a width that it in constant mesh with one of the driving gears.
Claim 7
Dependent Claim
38 words
A device according to claim 5, wherein said rotary member is a machine tool spindle, comprising a clutch for actuating said driving shaft, and means operable concomitantly with said orienting means for disengaging said clutch during said alignment.
Claim 8
Dependent Claim
46 words
A device according to claim 5, comprising an eccentric mounting said driving shaft and adapted to be fixed in different angular positions, and a plurality of pinions of different diameter adapted to be fixed on said driving shaft to mesh with one of said driving gears.
Claim 9
Dependent Claim
42 words
A device according to claim 4, wherein said driving gears are rotatably mounted on an intermediate shaft at a fixed axial position relative thereto, said intermediate shaft being axially shiftable by means of a fluid pressure piston and cylinder actuator coupled thereto.
Claim 10
Dependent Claim
34 words
A device according to claim 8, comprising a mechanical interlock between said intermediate shaft and said orienting means such that said intermediate shaft can only be shifted axially upon operation of said orienting means.
Claim 11
Dependent Claim
117 words
A device according to claim 9, wherein said orienting means comprise an axially movable cylinder adapted to slide over said rotary member for engaging a projection thereof by two internal converging edges to constrain said projection to rotate into alignment with the point to which they converge, said interlock comprising a lever which is urged normallY to engage in one or the other of a pair of annular grooves in a rod fixed to said intermediate shaft, the outer surface of said cylinder being shaped to cam an intermediate element to a position in which it moves said lever out of the engaged groove of said pair when said cylinder has slid fully over said rotary member.
Claim 12
Dependent Claim
43 words
A device according to claim 10, wherein a member fixed on said rotary member has a single V-shaped notch in which a positioning member is moved by a fluid pressure actuator to effect fine adjustment of the orientation established by said orienting cylinder.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |