Implements or apparatus for applying pushing or pulling force – Thill-coupling jack
Patent
1988-07-18
1990-07-31
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Thill-coupling jack
B25C 1100
Patent
active
049444913
ABSTRACT:
A staple remover for removing a staple from an object includes an elongate member which is progressively forced under a crown of the staple. The elongate member is preferably a larger claw member which cooperates with a smaller claw member in a pincer-like action. A protrusion or expanding member is provided on each lateral side of the elongate member with the distance between the protrusions being greater than the length of the crown of the staple and ending at a distance from the camming surface of the elongate member which is less than the length of a leg of the staple. Preferably, the protrusion extends generally parallel to the associated camming surface from adjacent the tip to a maximum protruding height which occurs where the distance between the associated camming surface and bearing surface is approximately 40 to 60% of the length of a leg of the staple. A groove is also provided in each lateral side which is spaced from the associated camming surface by a distance less than the length of a leg of the staple and into which the removed legs of the staple are received. Where the staple remover is pincer-like, the smaller claw members also preferably similarly formed with a protrusion. Overall, the distance between the protrusions is about 5 to 20% greater than the length of a crown of the staple.
REFERENCES:
patent: D160420 (1950-10-01), Pankonin
patent: 2375942 (1945-05-01), Palmer
patent: 2624545 (1953-01-01), Pankonin
patent: 3310288 (1967-03-01), Berry
patent: 3484080 (1969-12-01), Tolliver
patent: 3494591 (1970-02-01), Fleming
patent: 3583673 (1971-06-01), Poskin
patent: 3625482 (1971-12-01), Viel, III
patent: 3761057 (1973-09-01), Nembhard et al.
patent: 4054263 (1977-10-01), Delia
patent: 4205823 (1980-06-01), Goldy
patent: 4513951 (1985-04-01), Rogers
patent: 4553737 (1985-11-01), Yi
patent: 4674727 (1987-06-01), McAlister
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