Patent US783548A successfully refreshed from Google Patents.
Patent US3859952A successfully refreshed from Google Patents.
US3859952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock absorbing tilt mechanism for stern drives for boats
Assignee: Individual
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Filing: 1974-02-15
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Granted: 1975-01-14
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Expires: 1994-02-15
Abstract
Abstract A tilt and shock absorbing mechanism for a boat stern drive unit which includes a pair of telescoping cylinders threaded one over the other and connected such that, when one is rotated relative to the other in opposite directions, the tiltable section of the drive unit is pivoted upwardly and downwardly. A compression spring assembly is enclosed with the cylinders to permit tilting of the movable section of the drive unit against a spring bias and a friction snubbing device is operated in response to compression of the spring assembly to damp and limit the tilting movement of the movable section of the drive unit under the control of the spring assembly.
Inventors
- 👤 Aldo Celli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:29
CPC Classifications
B; B63; B63H; B63H20/00; B63H20/08; B63H20/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
272 words
A mechanical lift and shock absorbing mechanism for a stern drive unit for a boat, said drive unit being of the type having one section fixed to the stern of the boat and another section pivotally supported thereon for upward and downward tilting movement comprising, a cylinder assembly interconnecting said fixed and tiltable sections of the drive unit, said cylinder assembly comprising a pair of cylinders coaxially telescoped one within the other, the outer cylinder being threaded over the inner cylinder, one of said cylinders being fixed against rotation relative to one section of the drive unit and the other cylinder being rotatably supported on the other section of the drive unit, means for rotating said last mentioned cylinder relative to the other to vary the effective length of said link so that, when the link is extended, the movable section is tilted upwardly and, when the link is contracted, the movable section is tilted downwardly, first coil spring means within said cylinders, means operatively connecting said first spring means with one of said sections for biasing the tiltable section to a lowered operative position, said first spring means being adapted to be compressed in response to tilting of the movable section upwardly against the bias of the spring means, second coil spring means surrounding said first spring means and engaging the outer periphery thereof so that the second spring means are expanded diametrically in response to compression of the first spring means, said second spring means being dimensioned to frictionally engage the bore of the cylinder enclosing the same when expanded to progressively resist further compression of the first spring means.
Claim 2
Dependent Claim
272 words
A mechanical lift and shock absorbing mechanism for a stern drive unit for a boat, said drive unit being of the type having one section fixed to the stern of the boat and another section pivotally supported thereon for upward and downward tilting movement comprising, a cylinder assembly interconnecting said fixed and tiltable sections of the drive unit, said cylinder assembly comprising a pair of cylinders coaxially telescoped one within the other, the outer cylinder being threaded over the inner cylinder, one of said cylinders being fixed against rotation relative to one section of the drive unit and the other cylinder being rotatably supported on the other section of the drive unit, means for rotating said last mentioned cylinder relative to the other to vary the effective length of said link so that, when the link is extended, the movable section is tilted upwardly and, when the link is contracted, the movable section is tilted downwardly, first coil spring means within said cylinders, means operatively connecting said first spring means with one of said sections for biasing the tiltable section to a lowered operative position, said first spring means being adapted to be compressed in response to tilting of the movable section upwardly against the bias of the spring means, second coil spring means surrounding said first spring means and engaging the outer periphery thereof so that the second spring means are expanded diametrically in response to compression of the first spring means, said second spring means being dimensioned to frictionally engage the bore of the cylinder enclosing the same when expanded to progressively resist further compression of the first spring means.
Claim 3
Dependent Claim
62 words
The mechanism called for in claim 1 wherein said first spring means comprise a pair of coaxially opposed coil springs within the inner cylinder, said second spring means encircling only one of said coil springs so that the compression of the other coil spring is unhampered by the frictional engagement of the second spring means with The bore of the inner cylinder.
Claim 4
Dependent Claim
25 words
The mechanism called for in claim 2 wherein one of said first coil springs is designed to compress more readily under load than the other.
Claim 5
Dependent Claim
27 words
The mechanism called for in claim 2 wherein the coil spring enclosed by the second spring means compresses less readily under load than the other coil spring.
Claim 6
Dependent Claim
48 words
The mechanism called for in claim 2 wherein the coil spring not encircled by the second spring means is adapted to compress to a greater extent than the other coil spring before the second spring means expand into substantial frictional engagement with the bore of the inner cylinder.
Claim 7
Dependent Claim
99 words
The mechanism called for in claim 1 wherein said means operatively connecting the first spring means with one of said sections comprising a rod extending coaxially into said cylinders from one end thereof, said rod being pivotably mounted on one of said sections, said cylinders being axially slideable on said rod and said one cylinder being fixed against rotation on said rod, the distal end of the rod having an abutment thereon, said first spring means having one end abutting against said abutment and the other end abutting the end of the inner cylinder through which said rod extends.
Claim 8
Dependent Claim
29 words
The mechanism called for in claim 6 wherein the inner cylinder is fixed against rotation relative to said rod and relative to said fixed section of the drive unit.
Claim 9
Dependent Claim
29 words
The mechanism called for in claim 1 wherein the first coil spring means comprises a pair of opposed coil springs arranged in end abutting relation within said inner cylinder.
Claim 10
Dependent Claim
28 words
The mechanism called for in claim 8 including a diaphragm disposed between the adjacent opposed ends of said springs and slideable within the bore of the inner cylinder.
Claim 11
Dependent Claim
36 words
The mechanism called for in claim 1 wherein the second spring means comprises a coil spring having the inner periphery of each convolution engaging the radially outer portions of adjacent convolutions of the first spring means.
Claim 12
Dependent Claim
56 words
The mechanism called for in claim 10 wherein the inner periphery of the convolutions of said coil spring is of generally triangular cross section with the apex thereof facing radially inwardly and the opposed inclined sides thereof acting as cam faces engaging the radially outer portions of the adjacent convolutions of the second coil spring means.
Claim 13
Dependent Claim
39 words
The mechanism called for in claim 11 wherein the outer periphery of the convolutions of said coil spring defines a generally cylindrical surface adapted to frictionally engage the bore of the inner cylinder when the coil spring is expanded.
Claim 14
Dependent Claim
33 words
The mechanism called for in claim 1 wherein the outer cylinder is rotatably supported on the tiltable section and the means for rotating the same comprises a motor mounted on the tiltable section.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |