Implements or apparatus for applying pushing or pulling force – Nail extractor type – Single throw lever
Reexamination Certificate
2003-08-29
2004-12-07
Watson, Robert C. (Department: 3723)
Implements or apparatus for applying pushing or pulling force
Nail extractor type
Single throw lever
Reexamination Certificate
active
06827333
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a hammer with extendible fulcrum for use in connection with hammers. The hammer with extendible fulcrum has particular utility in connection with hammer having an extendible fulcrum with a fulcrum lever guard.
2. Description of the Prior Art
Hammer with extendible fulcrums are desirable for more easily removing nails with a claw type hammer. Currently, to remove nails with a claw type hammer on the head is used as a fulcrum, at times items will be placed under the head to increase the fulcrum arm length of the hammer. A need was felt for a hammer with an extendible portion that would act as a fulcrum arm for the hammer and that had a lever guard so that the fulcrum could not accidentally be released.
The use of hammers is known in the prior art. For example, U.S. Pat. No. 619,325 to Martin discloses a nail drawing device that has a handle and a spring dog. A spring actuated bar has a sliding relation to the handle. The bar has a rack and ratchet teeth which is adapted to engage the rack at an end of the ratchet teeth. When the rack passes the dog the tension of the spring that actuated the bar is given freedom to force the bar continuously outward without further manipulation of the dog until the nail is entirely withdrawn. However, the Martin '325 patent does not have a lever guard to prevent accidental release of the extension arm.
Similarly, U.S. Pat. No. 2,741,456 to Williams discloses a break over hammer that has a head having a cavity therein, a hollow gripping portion, a handle interconnecting the head and the gripping portion and a break over member slidably mounted in the cavity. A rod is affixed to the inner end of the break over and extends slidably through the handle to the gripping portion. A pair of diametrically opposed latch members are radially slidable in the wall of the gripping portion and each have a radially extending slot therein. A U-shaped trigger member longitudinally moves in the gripping portion. Barbed ends of the trigger portion are positioned in the slots. A stem is affixed to the trigger and slidably extends through the outer end of the gripping portion. A control button is affixed to the outer end of the stem. Rack teeth on the free end portion of the rod selectively engage with one of the latch members. An inverted tooth upon the rod is diametrically opposed to the teeth and is capable of engaging with the other of the latch members. Spring means in the gripping portion normally urge the barbed ends out of engagement with the slots in the latch members. However, the Williams '456 patent does not have a lever guard to prevent accidental release of the extension arm.
Lastly, U.S. Pat. No. 540,967 to Eveleth discloses a hand hammer that having a handle, with a claw head secured thereto and provided with a socket aligned with the handle. A plunger is movably mounted in the socket with one end flattened and movably adjustable to project at different distances beyond the head to form a fulcrum for the claw. A means for locking the plunger in the socket. However, the Eveleth '967 patent does not have a lever guard to prevent accidental release of the extension arm.
While the above-described devices fulfill their respective, particular objectives and requirements, the aforementioned patents do not describe a hammer with extendible fulcrum that allows hammer having an extendible fulcrum with a fulcrum lever guard. The Martin '325, Williams '456 and Eveleth '967 patents make no provision for have a lever guard to prevent accidental release of the extension arm.
Therefore, a need exists for a new and improved hammer with extendible fulcrum that can be used for hammer having an extendible fulcrum with a fulcrum lever guard. In this regard, the present invention substantially fulfills this need. In this respect, the hammer with extendible fulcrum according to the present invention substantially departs from the conventional concepts and designs of the prior art, and in doing so provides an apparatus primarily developed for the purpose of hammer having an extendible fulcrum with a fulcrum lever guard.
SUMMARY OF THE INVENTION
In view of the foregoing disadvantages inherent in the known types of hammers now present in the prior art, the present invention provides an improved hammer with extendible fulcrum, and overcomes the above-mentioned disadvantages and drawbacks of the prior art. As such, the general purpose of the present invention, which will be described subsequently in greater detail, is to provide a new and improved hammer with extendible fulcrum and method which has all the advantages of the prior art mentioned heretofore and many novel features that result in a hammer with extendible fulcrum which is not anticipated, rendered obvious, suggested, or even implied by the prior art, either alone or in any combination thereof.
To attain this, the present invention essentially comprises a handle having a bore. A claw head is connected to the handle. An elongate extension arm is slidably connected to the handle. The extension arm has a locking notch therein. A locking arm is detachably connectable to the extension arm locking notch. A button guard is connected to the handle and extends beyond the handle. A release button is slidably connected to the button guard. The release button is connected to the locking arm for actuating the locking arm.
There has thus been outlined, rather broadly, the more important features of the invention in order that the detailed description thereof that follows may be better understood and in order that the present contribution to the art may be better appreciated.
The invention may also include a button spring, an extension spring, a rubber grip and an extension arm rocker portion. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject matter of the claims attached.
Numerous objects, features and advantages of the present invention will be readily apparent to those of ordinary skill in the art upon a reading of the following detailed description of presently preferred, but nonetheless illustrative, embodiments of the present invention when taken in conjunction with the accompanying drawings. In this respect, before explaining the current embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of descriptions and should not be regarded as limiting.
As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, there fore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.
It is therefore an object of the present invention to provide a new and improved hammer with extendible fulcrum that has all of the advantages of the prior art hammers and none of the disadvantages.
It is another object of the present invention to provide a new and improved hammer with extendible fulcrum that may be easily and efficiently manufactured and marketed.
An even further object of the present invention is to provide a new and improved hammer with extendible fulcrum that has a low cost of manufacture with regard to both materials and labor, and which accordingly is then susceptible of low prices of sale to the consuming public, thereby making such hammer with extendible fulcrum economically available to the buying public.
Still another object of
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