| Concrete slab lifter -> Monitor Keywords |
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  Concrete slab lifterThe Patent Description & Claims data below is from USPTO Patent Application 20070261363. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application is a continuation of, and claims priority of, U.S. patent application Ser. No. 11/128,504, filed May 12, 2005, entitled "Concrete Slab Lifter", issuing as U.S. Pat. No. 7,213,380 on May 8, 2007. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to systems and methods of removing concrete. [0004] 2. Related Art [0005] Concrete floors are generally between four and twelve inches thick. When removing concrete flooring, there are two alternative approaches. The first is to saw trenches into the concrete so that the concrete is cut into rectangular slabs between eighteen and forty-eight inches long in a grid-like pattern. Each piece, which can weigh up to five hundred pounds, must be pried off the ground, lifted by hand, and then placed on a dolly to be removed from the site. This requires the laborer to get his fingers under one end of the slab, lift that end up off of the ground, and roll the slab onto the dolly. Two laborers are generally required to roll the slab onto the dolly. [0006] The second approach is to break the concrete floor into many small pieces and then remove the pieces from the site. This requires the laborer to make many trips with the pieces. It also produces small chunks and dust which are difficult to remove, making it difficult to leave the workplace clean after the concrete floor has been removed. SUMMARY OF THE INVENTION [0007] The present invention is a mechanical device used to grab, lift, and transport slabs of concrete comprising a central support member, a bottom plate, and a jaw which clamps the concrete slab between the jaw and the bottom plate. BRIEF DESCRIPTION OF THE DRAWINGS [0008] The accompanying drawings illustrate several aspects of embodiments of the present invention. The drawings are for the purpose only of illustrating preferred modes of the invention, and are not to be construed as limiting the invention. [0009] FIG. 1 is a front perspective view of the preferred embodiment of the present invention in the upright, locked position with the wheels in the lowered position. [0010] FIG. 2 is a rear perspective view of the preferred embodiment of the present invention in the upright, locked position with the wheels in the lowered position. [0011] FIG. 3 is a rear perspective view of the preferred embodiment of the present invention with the jaw unlocked from the central support. [0012] FIG. 4 is a rear perspective view of part of the preferred embodiment of the present invention showing the latch unlocking the jaw from the central support. [0013] FIG. 5 is a side view of the preferred embodiment of the present invention in the upright, locked position and the wheels in the lowered position. [0014] FIG. 6 is a side view of part of the preferred embodiment of the present invention showing the wheels swiveling between two positions against the central support. [0015] FIG. 7 is a rear view of the preferred embodiment of the present invention in the upright, locked position. [0016] FIG. 8 is a front view of the preferred embodiment of the present invention in the upright, locked position. [0017] FIG. 9 shows the preferred embodiment of the present invention at a workplace with trenches cut into the concrete floor to form a grid of rectangular concrete slabs. [0018] FIG. 10 shows the preferred embodiment of the present invention being lowered to lift a concrete slab with the base plate pressing against one end of the concrete slab and the jaw in the locked position. [0019] FIG. 11 shows the preferred embodiment of the present invention with the bottom plate pressed against one end of the concrete slab and central support being shortened to slide the tooth under the opposite end of the concrete slab, but the jaw still locked against the central support. [0020] FIG. 12 shows the preferred embodiment of the present invention with the jaw unlocked from the central support, the handle end being raised, and the concrete slab still on the ground but being tightly clamped between the bottom plate and the jaw. [0021] FIG. 13A shows the preferred embodiment of the present invention as it is being used to lift the concrete slab off of the ground after the wheels have pivoted upward relative to the central support. Continue reading... Full patent description for Concrete slab lifter Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Concrete slab lifter patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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