US3636954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound lever mechanism
Assignee: Mediplast AB
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Filing: 1969-11-17
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Granted: 1972-01-25
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Expires: 1989-11-17
Abstract
Abstract A compound lever mechanism of integral construction comprising a pair of opposed compound levers having common fulcra each compound lever comprising two or more simple first order levers articulated in series, the common fulcra and joints between the simple levers being provided by localized zones of the construction adapted to flex preferentially when sufficient force is applied to the levers. The mechanism is suited for incorporation in a compound lever forceps or like device, thus enabling devices having a scissors action to be formed in one piece, for example as one-shot polypropylene injection moldings.
Inventors
- 👤 David Frederick Weston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:05
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/28; A61B17/2804; B; B25; B25B; B25B7/00; B25B7/06; B25B7/08; Y; Y10; Y10T; Y10T24/00; Y10T24/44; Y10T24/44641; Y10T24/44744; Y10T24/44752; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20582; Y10T74/20588; Y10T74/20594
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
158 words
Forceps-type device of integral construction in plastics material comprising a first compound lever comprising a first operating handle and a first jaw member each being first order levers, a first flexible joint joining the first operating handle to the first jaw member, a second compound lever comprising a second operating handle and a second jaw member each being first order levers, a second flexible joint joining the second operating handle to the second jaw member, a first common fulcrum for the first and second operating handles, a second common fulcrum for the first and second jaw members, said first and second flexible joints and said first and second common fulcra comprising localized portions of the integral construction which flex without substantial flexure of the attached operating handles or jaw members on application of force to said operating handles or jaw members and constitute lines of flexure about which the operating handles or jaw members rotate in hingelike manner.
Claim 2
Dependent Claim
158 words
Forceps-type device of integral construction in plastics material comprising a first compound lever comprising a first operating handle and a first jaw member each being first order levers, a first flexible joint joining the first operating handle to the first jaw member, a second compound lever comprising a second operating handle and a second jaw member each being first order levers, a second flexible joint joining the second operating handle to the second jaw member, a first common fulcrum for the first and second operating handles, a second common fulcrum for the first and second jaw members, said first and second flexible joints and said first and second common fulcra comprising localized portions of the integral construction which flex without substantial flexure of the attached operating handles or jaw members on application of force to said operating handles or jaw members and constitute lines of flexure about which the operating handles or jaw members rotate in hingelike manner.
Claim 3
Dependent Claim
19 words
A forceps-type device according to claim 1 which is in the form of a single piece of plastics material.
Claim 4
Dependent Claim
15 words
A forceps-type device according to claim 2 in the form of a one-shot injection moulding.
Claim 5
Dependent Claim
23 words
A forceps-type device according to claim 2 in which the plastics material is selected from ethylene polymers, propylene polymers, polyamides, polyesters and polyacetals.
Claim 6
Dependent Claim
14 words
A forceps-type device according to claim 4 in which the plastics material is polypropylene.
Claim 7
Dependent Claim
18 words
A forceps-type device according to claim 1 having means for releasably locking the jaws in their gripping position.
Claim 8
Dependent Claim
51 words
A forceps-type device according to claim 1 wherein said first and second flexible joints are opposed to each other in spaced relationship between said fulcra, the joined levers being so shaped between said fulcra that the thickness varies gradually from a minimum at said joints to a maximum at said fulcra.
Claim 9
Dependent Claim
57 words
A forceps-type device according to claim 7 wherein the levers are gradually tapered inwardly from the flexible joints to the fulcra so that each flexible joint is essentially a line across the width of the joined levers and an essentially diamond-shaped open space is left between the fulcra and joints to permit inward movement of the joints.
Claim 10
Dependent Claim
60 words
A forceps-type device according to claim 8 wherein the levers constituting said first and second operating handles are shaped so that when the jaw members are open, the distance between said handles increases gradually from the first common fulcrum to the outer ends of said handles and said outer ends may be brought into contact to close said jaw members.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |