Implements or apparatus for applying pushing or pulling force – Floor jack type – Single throw lever
Reexamination Certificate
2000-07-20
2001-10-16
Hail, III, Joseph J. (Department: 3723)
Implements or apparatus for applying pushing or pulling force
Floor jack type
Single throw lever
C254S131000
Reexamination Certificate
active
06302375
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
(Not applicable)
STATEMENT REGUARDING FEDERALLY SPONSORED RESEARCH
(Not applicable)
REFERENCE TO A MICROFICHE APPEXDIX
(Not applicable)
BACKGROUND OF INVENTION
This invention relates to a single lever prying apparatus, specifically to prying apart lumber and lifting objects from the earth, and prying large sheets of drywall from walls.
Field of search 254/31.5,133r,132,120,121,113,018,019,131
BACKGROUND DESCRIPTION
What the invention accomplishes:
Contractors and builders of many trades need various tools to accomplish tasks involved in building. My said invention combines a pry bar, leverage bar and pick into one tool.
The demolition-leverage tool is used for multiple construction tasks. Prying apart lumber which is nailed or screwed together is the main function. It can also be swung like a pick to penetrate walls and pry off drywall or the like. A base pad can be attached by a single bolt on the base of the tool. This allows the tool to be used as a leverage bar and the base pad keeps the tool from sinking into soft soil.
The demolition tool in U.S. Pat. No. 4,183,503 has the limited use of prying only, and due to the smaller size, requires a larger amount of human energy to pry the boards apart. My said invention has a long enough handle to pry larger material apart with minimum effort.
It is common for older homes to have lumber that is very difficult to pry apart. Conventional pry bars are of insufficient size to pry apart larger boards. Conventional pry bars quickly tire the operator out because of the added strength needed to pry apart the boards. The demolition-leverage tool holds multiple advantages over conventional pry bars. One major benefit of my demolition-leverage bar is the operator can pry up floor boards while standing up. This saves the operator from having to crawl on their hands and knees to work. This saves time, energy and medical troubles for operators.
In the customary use of a conventional prying or lifting bar, the tip of the bar is forced underneath the object that needs to be lifted. The operator then must find blocks of wood, etc. to use as a fulcrum point in order to gain leverage on the item to be lifted. By adding the optional base plate on the demolition-leverage tool of present invention, it can be utilized as a leverage bar capable of lifting heavy objects such as concrete, large rocks, pavement and the like. The chisel-like prying member is forced into the earth under the item the operator wants to lift. The operator then positions their body opposite the item to be lifted, not standing on top of the item to be lifted. The operator then pulls on the handle similar to the aforementioned operation of prying, causing the chisel-like prying member to rise up causing the item to lift.
Conventional tools such as picks, shovels and the like normally have a wooden handle which often breaks. The demolition-leverage tool is built of such solid construction it is extremely difficult to break the handle.
In the customary use of conventional wrecking-bars, the chisel-like end of one of the two prying members thereof must be forced between the floor joist or wall-stud, on the one hand, and the floor board or wall board on the other hand. This is done by repeatedly ramming or hammering the prying member of the wrecking-bar between the joist or stud and the board or roofer nailed thereto, until the prying member has sufficiently penetrated therebetween to enable the operator to pry the board or roofer from the joist or stud as in U.S. Pat. No. 5,695,172. Such repeated ramming action needed for each successive floor-board, roofer or sheathing board not only consumes more time and requires the expenditure of more energy than is necessary, than by using the demolition-leverage tool of the present invention, but also damages the board so removed as well as the joist or stud to which it is nailed, so as to impair their subsequent re-use or salvage value in cases where it is desired to re-use the dismantled boards and joist and studs.
Because the demolition-leverage tool lifts under the entire board at one time, and the fulcrum point rests on the stud or stringer, the operator can apply steady pressure to pry the boards apart, therefore causing minimal damage to the board. Also, due to the large fulcrum point, extremely long pole barn shank nails can easily be removed without having to place blocks of wood behind the tool, as is needed when prying with a hammer or prybar with too short of fulcrum point as seen in U.S. Pat. Nos. 4,844,416, 4,183,503 and 5,695,172.
In using the demolition-leverage tool of present invention substances commonly known as sheet-rock, drywall or plywood can also be removed. The operator swings the demolition-leverage tool similar to an ax or hammer swing, causing the chisel-like tip penetrate the wall. The operator then uses the wall-stud as a leverage point for the pivot bar. This operation saves time by breaking the drywall into larger pieces, which take less time to clean up.
OBJECTS AND ADVANTAGES
Accordingly, besides the objects and advantages of the demolition-leverage tool described in my above patent, several objects and advantages of the present invention are:
(a) An operator can pry flooring boards while standing up, saving unnecessary back strain.
(b) An operator can penetrate walls, and pry siding off without switching tools, therefore saving time.
(c) An operator can pry up large sheets of plywood at one time, due to the large fulcrum point not found in other patents.
(d) An operator can place said tool under a stud wall, door, or window and quickly lift into the needed position for shimming without the operator having to bend over
(e) Fire departments and rescue crews can quickly break hinges off doors to gain access to buildings.
BRIEF SUMMARY OF THE INVENTION
The object of the present invention is a versatile one-piece demolition-leverage tool of simple, inexpensive and effective construction for prying floor-boards from floor-joists to which they are nailed and for prying wall-boards or wall-sheathing strips from wall-studs to which they are attached. This invention can also be plunged through a wall to remove drywall or sheetrock.
This invention has an attachment that independently connects to the base of the bar, which assists the operator in lifting heavy objects such as concrete, pavement and rocks. The base pad helps keep the tool from sinking into soft ground. A further object of the present invention is to facilitate and to reduce the labor and time required for such demolition operations, and to minimize the damage to the pried-apart pieces, thereby to preserve their utility for re-use.
Accordingly, the demolition-leverage tool of the present invention comprises of a straight steel tube handle bar with a shorter straight prying member affixed by welding to the steel tube at a right angle. The prying member has a pointed chisel-like tip at the end, opposite the base, for punching through walls, or to get underneath of the earth to lift concrete or the like. At the base of the tool where the prying member is connected to the tube handle is a crosswise-disposed pivot bar. This pivot bar serves as a pivot point for the prying member when force is applied to the handle bar.
A steel pad can be attached by a single bolt to the base of the tool. This base helps keep the tools from sinking into soft soil.
REFERENCES:
patent: D. 199019 (1964-08-01), Marson
patent: 1570192 (1926-01-01), Younick
patent: 2502271 (1950-03-01), Parker
patent: 2520427 (1950-08-01), Nelson
patent: 3049337 (1962-08-01), Griggs
patent: 5325576 (1994-07-01), Henderson
Heil Eric George
Heil George Burrill
Hail III Joseph J.
Wilson Lee
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