US3794369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lifting tool
Assignee: TACONITE ENG AND Mfg CO
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Filing: 1972-10-02
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Granted: 1974-02-26
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Expires: 1992-10-02
Abstract
Abstract A tool for lifting objects having an opening into which the tool may be inserted and its jaws expanded to grip the article. Although especially adapted to facilitate moving liner segments of rod and ball mills, the tool is adapted to lifting other articles having holes or other openings into which the tool may be inserted, such as pipe, drill rod, etc. The tool is characterized by an easily insertable tip associated with manual squeeze operated positive jaw contraction for ease of insertion in openings, spring assistance to expand the jaws into gripping position and eye means for crank hook-up to permit the load to actuate the jaws for positive gripping as the article is lifted. While the article being lifted is in transit, the lifter operating handle is inoperative and cannot release.
Inventors
- 👤 K Hnatko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:32
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/10; B66C1/42; B66C1/44; B66C1/54
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
181 words
A tool for lifting articles having an opening into which the tool may be inserted and expanded, said tool comprising: A. an elongated linear lifting member, B. an insertion tip at one end of said lifting member, C. hoist engaging means at the opposite end of the lifting member secured directly thereto and fixed longitudinally relative to the lifting member, D. a tubular body extending around and fixedly secured to said lifting member, the end of the body adjacent the tip end of the lifting member being open, E. a tubular jaw carrier disposed within the body at the open tip end for reciprocal movement relative thereto, F. a plurality of longitudinally extending jaws disposed around said lifting member, and pivotal support means connecting one end of each of the jaws in said jaw carrier, and G. means for reciprocating said jaw carrier relative to said tubular body and said lifting member, whereby when the jaw carrier is retracted within the body the jaws are contracted and when the jaw carrier is partially extended from the body the jaws are expanded.
Claim 2
Dependent Claim
181 words
A tool for lifting articles having an opening into which the tool may be inserted and expanded, said tool comprising: A. an elongated linear lifting member, B. an insertion tip at one end of said lifting member, C. hoist engaging means at the opposite end of the lifting member secured directly thereto and fixed longitudinally relative to the lifting member, D. a tubular body extending around and fixedly secured to said lifting member, the end of the body adjacent the tip end of the lifting member being open, E. a tubular jaw carrier disposed within the body at the open tip end for reciprocal movement relative thereto, F. a plurality of longitudinally extending jaws disposed around said lifting member, and pivotal support means connecting one end of each of the jaws in said jaw carrier, and G. means for reciprocating said jaw carrier relative to said tubular body and said lifting member, whereby when the jaw carrier is retracted within the body the jaws are contracted and when the jaw carrier is partially extended from the body the jaws are expanded.
Claim 3
Dependent Claim
17 words
A tool according to claim 1 further characterized in that said lifting member is a wire rope.
Claim 4
Dependent Claim
23 words
A tool according to claim 2 further characterized in that said insertion tip is a conical load button swaged to said wire rope.
Claim 5
Dependent Claim
23 words
A tool according to claim 2 further characterized in that said hoist eng the handle, the actuating pin and jaw carrier are retracted.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |