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US 4,466,851 AGranted
Method and apparatus for scraping adherent material from a smooth work surface
AssigneeLinear Pneumatics Inc.
InventorBrent K. Hoffman
Life of this patent
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AssigneeLinear Pneumatics Inc.
InventorBrent K. Hoffman
Estimating the term…
A pneumatic impact tool has a tubular housing with an impact head secured in and extending outwardly from one end of the housing and a valve secured within the housing but spaced from the impact head so that a piston chamber is formed within the housing. The valve has an inlet port adapted to be connected to a source of pressurized fluid and two outlet ports for the alternate release, respectively, of pressurized fluid. One outlet port opens directly into the piston chamber while the other is connected by a passage to the piston chamber immediately adjacent the impact head. At least one exhaust port is provided through the housing for exhausting pressurized fluid from the piston chamber when the piston reaches the end of its travel in each direction of its stroke. The housing is adapted to be connected to a source of pressurized fluid so that pressurized fluid enters the inlet port of the valve. The impact head is adapted to have an implement attached thereto for performing certain jobs such as removing stuck gaskets from engine blocks and the like.
A method of scraping adherent material from a smooth work surface, comprising placing the working end of a chisel-like blade, having a blade edge extending transversely of the blade and defined by at least one beveled blade surface, with its said blade surface flat against said work surface;
In a pneumatic tool having a tool body adapted to be easily held in and manipulated by one hand of the user and having an impact head fixedly secured thereto against relative movement, piston means for exerting successive impacts against said head, and means for introducing and exhausting a pneumatic fluid into and from said tool body for causing said piston means to rapidly and repeatedly impact said head, the combination therewith of an implement in the form of a blade fixedly secured to said impact head against relative movement, said blade having a blade edge defined by at least one beveled blade surface adapted to be held flat against a smooth work surface, said blade edge extending transversely of the blade so that said tool can be used to separate tightly adherent material from said work surface without marring said surface.
Dependencies are inferred from the claim text.