US3638804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hoisting apparatus
Assignee: Pacific Gas Equipment Co
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Filing: 1969-09-17
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Granted: 1972-02-01
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Expires: 1989-09-17
Abstract
Abstract A telescoping boom is pivotally mounted at one end on a base framework, the other end of the boom carrying a sheave over which is led a cable connected at one end to a power winch. The other end of the cable carries a hook, or the like for attachment to a load. A remotely operated clamping mechanism on the boom controls the lifting and lowering of the load in conjunction with operation of the winch, the clamping mechanism selectively serving to grip or release a translatable portion of the boom at the appropriate juncture, as determined by the operator and depending upon the attitude of the boom and the horizontal location of the load.
Inventors
- 👤 Carman H Blakeway
- 👤 Darold D Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:49
CPC Classifications
B; B60; B60P; B60P1/00; B60P1/54; B60P1/5404; B60P1/5423; B60P1/5428; B66; B66C; B66C23/00; B66C23/18; B66C23/36; B66C2700/00; B66C2700/03; B66C2700/0321; B66C2700/0357; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636; Y10T74/2066
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
338 words
A hoisting apparatus, comprising: a. a rigid frame adapted to be mouNted adjacent the forward end of a truck bed, said frame including an upwardly extending portion and a rearwardly extending portion; b. an elongated extensible boom pivotally mounted at one end to said frame for angular movement in a vertical plane, said boom including a first, axially fixed member pivotally secured to said upwardly extending portion and a second, axially movable member mounted on said first member for axial movement with respect thereto; c. a supporting arm pivotally secured at one end thereon said rearwardly extending portion at a point which is immediately above the level of the bottom of said frame and substantially below the level of the pivot of said boom, said supporting arm being pivotally connected at its other end to said second member; d. a winch mounted on said hoisting apparatus in a position adjacent the point of pivotal securement of said first member; e. a sheave mounted directly on and adjacent the outer end of said second member; f. a cable carried on said winch and trained over said sheave, said cable terminating in a load-supporting end; g. means on said cable for abutting the outer end portion of said boom when said cable is drawn toward said winch to thereby raise and retract said boom toward said frame; h. releasable gripping means carried by said first and second boom members and operable while said load-supporting end of said cable is moved vertically for selectively locking together said first and second members to prevent axial movement of said second member, said gripping means being self-locking in a boom extending direction and being self-releasable in a boom shortening direction in that release of the gripping means is initiated by retraction of said second boom member and said gripping means is maintained out of engagement with said second member by control means disposed at a position remote from said gripping means and connected thereto for selectively operating said gripping means from said remote position.
Claim 2
Dependent Claim
338 words
A hoisting apparatus, comprising: a. a rigid frame adapted to be mouNted adjacent the forward end of a truck bed, said frame including an upwardly extending portion and a rearwardly extending portion; b. an elongated extensible boom pivotally mounted at one end to said frame for angular movement in a vertical plane, said boom including a first, axially fixed member pivotally secured to said upwardly extending portion and a second, axially movable member mounted on said first member for axial movement with respect thereto; c. a supporting arm pivotally secured at one end thereon said rearwardly extending portion at a point which is immediately above the level of the bottom of said frame and substantially below the level of the pivot of said boom, said supporting arm being pivotally connected at its other end to said second member; d. a winch mounted on said hoisting apparatus in a position adjacent the point of pivotal securement of said first member; e. a sheave mounted directly on and adjacent the outer end of said second member; f. a cable carried on said winch and trained over said sheave, said cable terminating in a load-supporting end; g. means on said cable for abutting the outer end portion of said boom when said cable is drawn toward said winch to thereby raise and retract said boom toward said frame; h. releasable gripping means carried by said first and second boom members and operable while said load-supporting end of said cable is moved vertically for selectively locking together said first and second members to prevent axial movement of said second member, said gripping means being self-locking in a boom extending direction and being self-releasable in a boom shortening direction in that release of the gripping means is initiated by retraction of said second boom member and said gripping means is maintained out of engagement with said second member by control means disposed at a position remote from said gripping means and connected thereto for selectively operating said gripping means from said remote position.
Claim 3
Dependent Claim
16 words
A hoisting apparatus as in claim 1 wherein said winch is power driven and remotely controlled.
Claim 4
Dependent Claim
37 words
A hoisting apparatus as in claim 1 wherein said extensible boom comprises a first member and a second member telescopingly arranged relative to said first member for axial movement between a first position and a second position.
Claim 5
Dependent Claim
53 words
A hoisting apparatus as in claim 3 including a ratchet on said first member; a pawl carried on said second member selectively engageable with said ratchet for immobilizing said first member relative to said second member at a predetermined boom length; and means for selectively effecting engagement between said pawl and said ratchet.
Claim 6
Dependent Claim
34 words
A hoisting apparatus as in claim 4 further including a spring effective to bias said pawl into engagement with said ratchet; and means for remotely urging said pawl away from engagement with said ratchet.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |