Implements or apparatus for applying pushing or pulling force – Thill-coupling jack
Patent
1995-10-13
1997-08-05
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Thill-coupling jack
B25C 1100
Patent
active
056534248
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the field of staple removers and is particularly concerned with an ergonomic staple remover having a set of interchangeable blades for unclenching the staples and lifting them away from the stapled sheets and a claw assembly for graspingly pulling the removed staples towards a removable storage compartment.
BACKGROUND OF THE INVENTION
The art of staple removers is replete with various devices for removing conventional staples clenched on paper-type material. A relatively large number of staple removing devices are of the so-called "jaw-type". U.S. Pat. No. 4,054,263 issued to Michael Delia on Oct. 18, 1977, constitutes a typical example of a patent disclosing a so-called "jaw-type" staple remover.
These so-called "jaw-type" devices incorporate a pair of oppositely disposed cooperable jaws. Both jaws have upper and lower camming surfaces adapted to be inserted between the crown portion of a staple and the material to which the staple is attached. When the jaws are forced together, they simultaneously press upwardly on the crown portion of the staple and downwardly on the material. The staple is thus pulled out of the material.
The so-called "jaw-type" of staple removers suffers from a set of drawbacks. Firstly, they are relatively difficult and awkward to operate. They require a certain amount of manual dexterity and occasionally damage the fingernails of the user. Secondly, they often lead to tearing or damaging of both the staple and the sheet to which it is attached during the staple removing operation.
Thirdly, although some "jaw-type" staple removers has built-in components for retaining the removed staples, most of these staple retaining components have proven to be both costly and inefficient. Consequently, commercially successful "jaw-type" staple removers are sold without any staple retaining component and the removed staples must be disposed of one at a time by hand.
Although this problem might seem at first trivial it sometimes leads to more serious situations. Staples removed individually by hand frequently find their way on desk surfaces or floors as well as adjacent structures and equipment. The used staples which tend to become scattered clutter the premises.
The used staples occasionally fall by gravity onto the floor surface. When the floor surface is covered with a carpet, the sharp end portions thereof typically become embedded in the carpet by pressure contact with shoes as persons walk on the carpet. The staples after becoming wholly or partially embedded in the carpet are removed therefrom only with great difficulty. Not only do the used staples impart an unsightly appearance to the carpet when they are partially embedded therein, but they may also potentially cause serious injury to a child inadvertently trying to swallow them. Furthermore, if the used staples fall between the various operating parts of office machines such as photocopiers, they could potentially cause malfunctions and damages.
Another type of conventionally used staple remover is the so-called "blade-type" staple remover. An example of such staple remover is disclosed in U.S. Pat. No. 3,625,482 issued on Dec. 7, 1971, to Charles F. Viel III and in U.S. Pat. No. 4,513,951 issued on Apr. 30, 1985, to E. Mark Rodgers.
The so-called "blade-type" of staple removers has a forwardly projecting blade adapted to be inserted between the crown of the staple and the top surface from which the staple is to be removed. The blade typically has a forwardly tapering configuration. As the blade is slid between the crown section of the staple and the top surface of the material from which it is being removed, the thickness of the blade increases thus pushing the staple upwardly and unclenching it. Although relatively easier to operate than the so-called "claw-type" of staple removers, the so-called "blade-type" of staple removers also suffers from a set of drawbacks.
Indeed, even though the structures disclosed in both hereinbefore cited patents are provided with means for sto
REFERENCES:
patent: 2631816 (1953-03-01), Neilsen
patent: 3009155 (1961-10-01), Leniz
patent: 3528643 (1970-09-01), Munson
patent: 4513951 (1985-04-01), Rogers
patent: 5090663 (1992-02-01), Crutchfield et al.
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