Patent US3712488A successfully refreshed from Google Patents.
US3712488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Launching device for boat trailers
Assignee: Individual
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Filing: 1971-10-28
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Granted: 1973-01-23
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Expires: 1991-10-28
Abstract
Abstract A launching device detachably mountable upon the stanchion of a boat trailer to exert force upon the prow of the boat to push the boat rearwardly relative the trailer to launch the boat when the rear portion of the trailer is immersed in water. The device comprises a series of pivotally joined pairs of arms which are capable of extension and retraction in scissors fashion. A crank means rotates a screw which threadedly engages with corresponding pivots to forceably move said pivots alternately closer and farther to effect the contraction and expansion of the device. Expansion of the device exerts pressure upon the prow of the boat thereby urging said boat rearwardly relative the trailer.
Inventors
- 👤 L Steves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:58
CPC Classifications
B; B60; B60P; B60P3/00; B60P3/06; B60P3/10; B60P3/1033; B60P3/1066
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
435 words
In a boat trailer adapted to be towed by a powered vehicle and releasably support a boat thereon, which trailer includes: a generally elongate load bearing frame having a forward end and a rearward end, wheeled running gear for supporting said frame, a tongue extending forwardly from said frame and having a hitch arrangement at the free end thereof for coupling to said powered vehicle, boat support means secured upon the top of said frame, a stanchion proximate the front of said trailer, and winch means secured to said stanchion for pulling said boat onto said trailer to be supported by said boat support means, whereby said boat normally is carried upon said support means in co-axial longitudinal alignment with said frame, the prow of said boat being proximate said stanchion, the improvements in said boat trailer adapted to assist in launching said boat by moving said boat rearward relative to said trailer whereby said boat may float free of said trailer when the rearward end of said trailer is immersed in water, which improvements comprise: a. a mounting bracket securable to said stanchion; b. a first pair of elongate arms having a first end and a second end pivotally secured about a vertical axis of rotation at the first end thereof to said mounting bracket and extending horizontally divergent therefrom; c. a second pair of elongatE arms, substantially longer than said first pair of arms, and having first and second ends, one of each of said arms pivotally secured at the first end thereof about a vertical axis of rotation to the second end of one of said first pair of elongate arms, said arms extending horizontally convergent from said pivotal securement to cross proximate at the common center of the length of both said arms and having a pivotal securement about a vertical axis at said common center at the length of said arms; d. a third pair of elongate arms at least as long as the first said pair of arms, and having first and second ends; each said arm pivotally secured about a vertical axis of the first end thereof to the second end of said second pair of arms and extending horizontally convergently therefrom; e. a second bracket pivotally secured to the second ends of said third pair of elongate arms, each said arm pivotally secured thereto about a vertical axis of rotation; f. means extending from said second bracket for cradling the prow of said boat; and g. means reacting upon each said pivotal securement to controllably vary the distance between the said mounting bracket and said second bracket.
Claim 2
Dependent Claim
435 words
In a boat trailer adapted to be towed by a powered vehicle and releasably support a boat thereon, which trailer includes: a generally elongate load bearing frame having a forward end and a rearward end, wheeled running gear for supporting said frame, a tongue extending forwardly from said frame and having a hitch arrangement at the free end thereof for coupling to said powered vehicle, boat support means secured upon the top of said frame, a stanchion proximate the front of said trailer, and winch means secured to said stanchion for pulling said boat onto said trailer to be supported by said boat support means, whereby said boat normally is carried upon said support means in co-axial longitudinal alignment with said frame, the prow of said boat being proximate said stanchion, the improvements in said boat trailer adapted to assist in launching said boat by moving said boat rearward relative to said trailer whereby said boat may float free of said trailer when the rearward end of said trailer is immersed in water, which improvements comprise: a. a mounting bracket securable to said stanchion; b. a first pair of elongate arms having a first end and a second end pivotally secured about a vertical axis of rotation at the first end thereof to said mounting bracket and extending horizontally divergent therefrom; c. a second pair of elongatE arms, substantially longer than said first pair of arms, and having first and second ends, one of each of said arms pivotally secured at the first end thereof about a vertical axis of rotation to the second end of one of said first pair of elongate arms, said arms extending horizontally convergent from said pivotal securement to cross proximate at the common center of the length of both said arms and having a pivotal securement about a vertical axis at said common center at the length of said arms; d. a third pair of elongate arms at least as long as the first said pair of arms, and having first and second ends; each said arm pivotally secured about a vertical axis of the first end thereof to the second end of said second pair of arms and extending horizontally convergently therefrom; e. a second bracket pivotally secured to the second ends of said third pair of elongate arms, each said arm pivotally secured thereto about a vertical axis of rotation; f. means extending from said second bracket for cradling the prow of said boat; and g. means reacting upon each said pivotal securement to controllably vary the distance between the said mounting bracket and said second bracket.
Claim 3
Dependent Claim
179 words
The improved boat launcher of claim 1 wherein said means for controllably varying the distance between the said mounting bracket and said second bracket includes: a. a first bracket integral with the pivot mount of one end of said second arm and having a horizontally threaded aperture therethrough; b. a second bracket integral with the pivot mount of the same end of said second arm as said first bracket and having a horizontally threaded aperture of reverse rotation from the threaded aperture of said first bracket extending therethrough said first bracket substantially parallel to said second bracket wherein the longitudinal axis of the threaded aperture of said first bracket is in horizontal axial alignment with the axis of the aperture of said second bracket; c. a shaft having threaded portions of opposite rotation extending inwardly from either end thereof and extending through the aperture of said bracket and the aperture of said second bracket and having the threaded portions thereof threadedly engaging the corresponding rotationally threaded aperture of each said bracket; and d. means for rotating said threaded shaft.
Claim 4
Dependent Claim
79 words
The boat launcher of claim 1 wherein said means extending from said second bracket for abutting the prow of said boat includes: a. a shaft having a first end and a second end pivotally secured about a horizontal axis of rotation at the first end thereof to said second bracket, and b. an upstanding cradle secured to the second end of said shaft said cradle substantially sized and shaped to engage and mate with the prow of said boat.
Claim 5
Dependent Claim
15 words
The boat launcher of claim 3 wherein said cradle is detachably secured to said shaft.
Claim 6
Dependent Claim
15 words
The boat launcher of claim 3 including means for adjusting the length of said shaft.
References Cited (Backward Citations)
US3038617A
Cited
US3682335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |