Tools – Receptacle closure remover – Gripping type
Patent
1978-03-16
1980-01-01
Smith, James G.
Tools
Receptacle closure remover
Gripping type
259 77, 1401235, B25B 700, B66F 300
Patent
active
041810465
ABSTRACT:
A clamping device for stretching sheet material, such as a canvas painting, about a frame member is disclosed. The apparatus of the invention comprises a hand-held clamping device which includes a pair of pivotally connected jaw-carrying members that are movable from an open position, in which the opposing jaws are spaced apart from each other, to a clamping position in which the opposing jaws are placed in tight engagement with each side of the canvas or like sheet material. The first jaw carrying member comprises an elongated handle-type structure or arm that is pivotally connected with the second jaw-carrying member. The latter comprising a plate-like structure having two parallel sides which form a groove for receiving the first jaw-carrying member. A locking mechansim is slidably mounted within the second jaw-carrying member in a manner such that when the device is in a canvas-holding position, one end of the locking bolt presses against a shoulder formed on the first jaw-carrying member and imparts a clockwise locking motion to the jaw formed on the first jaw-carrying member. Thus, the upper jaw is pressed tightly and locked against the opposing jaw, the latter serving to increase and maintain the gripping force between the upper and lower jaws. A particularly advantageous concept of the invention involved the use of a pre-set tension spring which serves as a primary functional component of a tension gage mounted on the device so that the tension or pressure exerted on the sheet material can be readily determined.
REFERENCES:
patent: 148347 (1974-03-01), Boller
patent: 1156597 (1915-10-01), Hanson
patent: 2362707 (1944-11-01), Malmquist
patent: 2608793 (1952-09-01), Gant
patent: 2627769 (1953-02-01), Anderson et al.
patent: 4114433 (1978-09-01), Bowen
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