Implements or apparatus for applying pushing or pulling force – Nail extractor type – Single throw lever
Reexamination Certificate
2003-01-16
2003-12-16
Wilson, Lee D. (Department: 3723)
Implements or apparatus for applying pushing or pulling force
Nail extractor type
Single throw lever
C254S131000, C254S030000
Reexamination Certificate
active
06663083
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to crowbars or pry bars, and, in particular, to a crowbar which can be used to more easily separate two pieces of wood without marring the wood.
Crowbars and pry bars have long been used to separate pieces of wood or other items which are connected (i.e., nailed) together. Often during construction, for example, of a house or other building, it is necessary to separate two cross-bars which have been connected together. When a traditional crowbar is used, the head or claw of the crowbar is forced between the two pieces of wood, and the top piece of wood is pried off the bottom piece of wood. While this works to separate the two pieces of wood, the act of forcing the claw between the two pieces of wood can mar or splinter one or both pieces of wood, making either or both pieces of wood unusable. As can be appreciated, this results is waste.
Crowbars have been designed to help tear up floors. For example, Waddell, Pat. No. 977,986 discloses a crowbar having arms extending out from opposite sides of the crowbar's claw which act as a fulcrum to provide for extra stabilization of the crowbar during use. The bottom of the arms are level with the bottom of the claw. Hence, the claw will be difficult to properly position to separate two cross-beams. Further, the position of the arms changes the direction of force which is applied to the claw (and hence to the boards being separated) making it difficult to pry apart cross-beams, unless the claw is forced between the two cross-beams. Such use of the crowbar, as noted above, can lead to marring and splintering of the beams being separated.
BRIEF SUMMARY OF THE INVENTION
Briefly stated, a crowbar of the present invention includes a shaft, a curved neck at one end of the shaft, a straight section extending from the end of the curved neck, and a pivot arm positioned substantially at the junction between the curved neck and the straight section. The pivot arm is positioned above the straight section and preferably forms an angle of about 90° with said straight section. Additionally, the pivot arm is relatively short, having a length of less than 4″. Preferably, the pivot arm has a length of about 2″ to about 4″. Additionally, although the crowbar could be supplied with a single pivot arm, it is preferably supplied with two pivot arms extending in opposite directions from each other.
REFERENCES:
patent: 178407 (1876-06-01), Butts
patent: 977986 (1910-12-01), Waddell
patent: 1309734 (1919-07-01), Hemfling, Sr.
patent: 1570192 (1926-01-01), Younick
patent: 2087148 (1937-07-01), Hempy
patent: 2457231 (1948-12-01), Henderson
patent: 2525226 (1950-10-01), Lawellin
patent: 2693935 (1954-11-01), Halbert
patent: D199019 (1964-08-01), Marson
patent: 3522932 (1970-08-01), Nakasone
patent: 3744758 (1973-07-01), Nakasone
patent: 4183503 (1980-01-01), Ward
patent: 4380326 (1983-04-01), Marzorati et al.
patent: 5547168 (1996-08-01), Kelly
patent: 5855358 (1999-01-01), Witter
patent: 6186479 (2001-02-01), Witter
Polster Lieder Woodruff & Lucchesi L.C.
Wilson Lee D.
LandOfFree
Crowbar with pivot arm does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Crowbar with pivot arm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crowbar with pivot arm will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3125145