Punch for office use
AssigneeCarl Manufacturing Co., Ltd.
InventorChuzo Mori
Life of this patent
Estimating the term…
Abstract
A large punch for piercing a thick bundle of sheets of paper at a time. A gear mechanism is operationally associated with a handle to move vertically a pair of paper holding plates cooperating with a pair of cylindrical piercing blades provided on a base, and thereby reduces the force required for moving the handle for the piercing operation. A base plate, which has a pair of holes each defining a passage for one of the piercing blades, is vertically rotatably supported on the base, and is normally biased upwardly to facilitate removal of the piercing blades from a thick bundle of sheets of paper after it has been pierced. The piercing blades and the paper holding plates are removably attached to the base and the gear mechanism, respectively, so that both of them can be easily changed to new ones if required.
Claims12
A punch for office use comprising:
- a base, having a tip end side and a rear end side,
- a hollow upstanding structural member provided at the tip end side of the base and having a gap portion from the base at its side corresponding to the side of the rear end of the base,
- a pair of stationary cylindrical piercing blades upstandingly provided on and fixedly secured to the base forming the gap portion,
- a base plate for placing a thick stack of sheets of paper to be pierced thereon having one end pivoted at the rear end side of the base, the other end having holes for receiving the pair of piercing blades,
- spring means connected to the other end of the base plate and the hollow upstanding structural member to upwardly bias the base plate,
- a handle supported on the upstanding structural member by a shaft which penetrates the upstanding structural member and is rotatably supported thereto, said handle rotatably movable with respect to the base,
- gear means attached to the shaft supporting the handle, said gear means located within the upstanding structural member,
- vertically movable gear means movable within a portion of the upstanding structural member above the gap portion, and engageable with the gear means attached to the shaft, said vertically movable gear means reciprocating with respect to the pair of piercing blades through the gear means attached to the shaft as the handle is moved, and
- a pair of paper holding plates provided on the bottom of the vertically movable gear means, corresponding to the pair of piercing blades so as to thrust against the ends of the piercing blades.
Dependencies are inferred from the claim text.