Cutting – With receptacle or support for cut product
Patent
1986-12-17
1988-05-10
Kazenske, E. R
Cutting
With receptacle or support for cut product
83588, 83618, B26F 132
Patent
active
047427442
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for manually punching holes in sheets of paper and the like. The device includes a bottom part, carrying a overshaped movably mounted operative member, to which there are attached at least two punches in register with corresponding holes in the bottom part, the operative member being adapted for pressing down towards the bottom part by two mutually opposing legs on the member being guided in side walls arranged on the bottom part for causing the punches to pass through a sheet insertion slit arranged in the bottom part.
BACKGROUND ART
Such hole punching devices are well known, and are often implemented in pressed sheet metal, e.g. according to the German published specification 1 063 575, the different parts being welded or riveted to each other. With regard to this, assembly work is difficult and requires many work operations which cause the finished product to be more expensive.
It is also known to implement hole punches which work according to a swinging arm principle. Here there are problems with regard to oblique loading on the punches, the downward press movement of which is caused by the swinging movement of the operative member. Such a device is known, e.g. from the German patent No. 3,135,786. The hole punch device recited in this patent is constructed from extruded sections and has a pressure plate or a cover which is mounted as a simple lever. The punch, mounted with the aid of a spring in the bottom part of the device, has a sliding surface for coaction with the inside of the cover. A troublesome shear stress occurs in the punch for the turning movement carried out by the cover during punching operations, and to obtain a trouble-free axial movement the punch must be accommodated in a long guide hole with tight tolerances. In turn, this means troublesome problems with high friction between the punch body and the long guide hole
Known hole punch devices furthermore have a deficiency in that it is not possible to adjust the punches for different hole spacing. This is extremely troublesome for manufacturers intending to sell the device on different markets, since there are so many different standards with respect to hole spacing. The manufacturers have thus been compelled to manufacture and stock hole punches with different hole and punch spacing, which of course also makes the product more expensive.
DISCLOSURE OF INVENTION
The above-mentioned disadvantages are surmounted with a device in accordance with the present invention. This is characterized in that the operative member includes a cover with a substantially C-shaped cross section, the opposing legs of which coact with at least one abutment on the side walls of the bottom part for limiting the upward movement of the lid and defining its rest position. The punches are attached to the ceiling of the cover with means extending in the longitudinal direction of the cover. Spring bias is generated by spring means which are arranged in the lid on either side of the attachment means of the punches and engage against the surfaces facing towards each other on the lid and bottom part.
In a preferred embodiment of the hole punch in accordance with the invention, the bottom part comprises a foot unit forming a closed space for punch roundels, and along one long side it has a web provided with bulbed flanges which are fixable on correspondingly formed strips on an intermediate unit associated with the bottom part. Fixation can here take place with an elastic locking means inserted between opposing surfaces on one of the flanges and one of the strips, respectively. This embodiment is well suited for being produced from extruded sections. Accordingly, the cover, foot and intermediate units may be manufactured from such sections, which are relatively cheap from the manufacturing aspect.
With this implementation, manufacture of a hole punch will be particularly simple, since it is not necessary to resort to welding or riveting Furthermore, if desired, the foot and intermediate units of the botto
REFERENCES:
patent: 3906633 (1975-09-01), Inoue
patent: 4166404 (1979-09-01), Almog
Kazenske E. R
Phan Hien H.
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