US3848477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for guiding and resuming the axial clearance in screws of reduction worms, particularly for low power geared motor
Assignee: Industrie Magneti Marelli SRL
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Filing: 1973-03-02
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Granted: 1974-11-19
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Expires: 1993-03-02
Abstract
Abstract Device for guiding and controlling the axial shifting of the worm in worm reduction gears, including a spring acting upon an end of the worm to counteract its axial thrust, a cap at the end of the worm for radially supporting same and upon which the spring operates and further comprising a wedge shaped block with its inclined surface inclined transversely to the axis of the worm and the spring acting to bias the block transversely to the axis of the worm.
Inventors
- 👤 A Giandinoto
- 👤 U Gilardelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:48
CPC Classifications
F; F16; F16H; F16H57/00; F16H57/02; F16H57/021; F16H1/00; F16H1/02; F16H1/04; F16H1/12; F16H1/16; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0806; F16H37/0826; F16H55/00; F16H55/02; F16H55/22; F16H55/24; H; H02; H02K; H02K7/00; H02K7/08; H02K7/081; F16H2057/0213; H02K2205/00; H02K2205/03; H02K2213/00; H02K2213/09; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19828
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
155 words
Device for automatically absorbing the axial motion of a gear worm, which motion results from engagement of the worm with a reciprocating element or the like, comprising: a motor, a motor shaft driven by said motor; said shaft having an axis; a gear worm secured on and coaxial with said motor shaft, such that said motor drives said shaft and said gear worm to rotate; said shaft having a free end which undergoes axial shift due to axial force applied to said worm; wedge means in communication with said shaft free end; said wedge means being shaped and positioned such that reciprocation thereof transversely to said shaft axis reciprocates said shaft along said axis, and said wedge means being shaped such that reciprocation of said wedge means in one direction thrusts said shaft axially away from said wedge means; spring means connected to said wedge means for reciprocating said wedge means in said one direction.
Claim 2
Dependent Claim
155 words
Device for automatically absorbing the axial motion of a gear worm, which motion results from engagement of the worm with a reciprocating element or the like, comprising: a motor, a motor shaft driven by said motor; said shaft having an axis; a gear worm secured on and coaxial with said motor shaft, such that said motor drives said shaft and said gear worm to rotate; said shaft having a free end which undergoes axial shift due to axial force applied to said worm; wedge means in communication with said shaft free end; said wedge means being shaped and positioned such that reciprocation thereof transversely to said shaft axis reciprocates said shaft along said axis, and said wedge means being shaped such that reciprocation of said wedge means in one direction thrusts said shaft axially away from said wedge means; spring means connected to said wedge means for reciprocating said wedge means in said one direction.
Claim 3
Dependent Claim
114 words
The device of claim 1, wherein said wedge means comprises a block that is in communication with said shaft free end and that reciprocates transversely with respect to said shaft axis; said wedge means further comprises an abutment which is fixed in position relative to both of said shaft and said block; said block having a first surface in engagement with said abutment and a second surface generally on the opposite side of said block from said first surface and in communication with said shaft free end; at least one said block surface being inclined with respect to said shaft axis; whereby as said block reciprocates, it axially shifts said shaft and said worm.
Claim 4
Dependent Claim
15 words
The device of claim 2, wherein said block inclined surface is said first surface thereof.
Claim 5
Dependent Claim
15 words
The device of claim 2, wherein said block inclined surface is said second surface thereof.
Claim 6
Dependent Claim
137 words
The device of claim 2, further comprising: a support casing surrounding said shaft in the vicinity of said shaft free end; a centering bushing in said casing, said bushing being of a cross sectional size to be held in said casing so as to only be axially slidable through said casing; said bushing having a receiving opening of a cross sectional size approximating that of said shaft in the vicinity of said free end thereof; said shaft free end extending into said bushing and said shaft being held and supported against shifting, other than axial shifting of said shaft, by means of said bushing and said casing; said bushing including an end wall which is engaged on one side by said shaft free end and which is engaged on the opposite side by said second block surface.
Claim 7
Dependent Claim
117 words
The device of claim 5, wherein said casing extends past said bushing and said shaft free end toward and beyond said block and behind said first surface of said block; said block having a clearance opening extending therethrough; said bushing having an extension projecting through said block clearance opening; the portion of said casing behind said block first surface being shaped to define a receiving opening that is dimensioned and of a length to receive said bushing extension to permit axial shifting of said bushing extension and being of a cross section approximating that of said bushing extension to prevent shifting, other than axial shifting, of said bushing extension; said bushing extension extending into said casing opening.
Claim 8
Dependent Claim
47 words
The device of claim 5, wherein said support casing has said block and said spring means positioned therein; said block engaging abUtment being fixedly positioned with respect to said block within said casing; said spring means extending between and being compressed between said casing and said block.
Claim 9
Dependent Claim
15 words
The device of claim 7, wherein said block inclined surface is said first surface thereof.
Claim 10
Dependent Claim
15 words
The device of claim 7, wherein said block inclined surface is said second surface thereof.
Claim 11
Dependent Claim
49 words
The device of claim 2, further comprising a support casing in which said block and said spring means are positioned; said block engaging abutment being fixedly positioned with respect to said block within said casing; said spring means extending between and being compressed between said casing and said block.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |