HOLE PUNCHING DEVICE

Abstract: A device for manual hole punching of sheet material is made up from extruded profiles, one forming a cover (1), which is movable towards a bottom part (2) formed from two combined sections (7, 8). The cover carries punches (22) running in holes (23). A counter-acting spring bias is obtained by spring means (25) inserted between the cover and bottom part.

Description: HOLE PUNCHING DEVICE 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 cover- shaped 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. accord- ing 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 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 trouble¬ some 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 bottom part may be provided with a large number of holes mutually forming different hole spacing correspond- ing to different standards applicable to different markets. The punches are removably fixed in the fasten¬ ing means of the lid, and the punches can thus be set against the hole spacing prevailing at the moment.. Preferred Embodiment The invention will now be described in detail in connection with a preferred embodiment and with reference to the accompanying drawings, on which Figure 1 is a perspective view of a hole punch in accordance with the invention, Figure 2 is a section II - II according to Figure 1 , Figure 3 illustrates the parts from which a hole punch in accordance with the invention is made, and Figure 4 and 5 illustrate modified embodiments of sections for the bottom part of the hole punch. As will be seen from Figures 1 and 2, the device for manual hole punching has, in a preferred embodiment, an elongate shape. The device includes a cover 1 , bottom part 2 and end walls 3, 4. A sheet insertion slit 5 is made in the bottom part 2. The end walls, exemplified in Figure 1 by the end wall 3, may have a corresponding slit if the hole punch is to be provided with a setting plate 6, as is the case in the illustrated embodiment. The setting plate 6 is withdrawably mounted in the bottom part 2 for conventionally enabling adjustment for sheets of different sizes. It will be seen from Figure 2, which is a section II - II according to Figure 1 , how the device is constructed. The bottom part 2 is formed from two units, namely a foot unit 7 and an intermediate unit 8. The foot unit 7 has a closed space 9 for accommodating punch roundels. A web 10 is formed on the ceiling of the space 9 along one long side of the foot unit 7. The web 10 has two fastening flanges 11 parallel to the ceiling, and each having a bulb 12, the bulbs being directed in the same direction. The fastening flanges 11 and their bulbs 12 on the foot unit 7 are intended to coact with strips 13 correspondingly formed on the intermediate unit 8. The intermediate unit 8 thus has two flat portions 14, 15, each having a strip 13. The lower flat portion 14 is inserted on assembly of the hole punch in the space between the fastening flanges 11, simultaneously as an elastic locking means 16 is arranged between the lower flat portion 14 and the upper fastening flange 11. The foot and intermediate units 7 and 8 will accordingly be firmly fixed to each other and between them form the sheet insertion slit 5. Both flat portions 14 and 15 of the intermediate unit 8 are united with each other by transverse walls 17. The upper flat portion 15 projects out past the side edges formed by one of the transverse walls 17 of the intermediate unit 8 and the upright 10, abutments 18 thus being formed. These abutments 18 coact with the cover 1, which is acted on by upwardly directed spring bias, the cover having along its lower edge inwardly directed stop means 20 on each side surface 19. On the inside of the ceiling of the foot unit 7, there is a bulbed strip 27 formed to thrust into the space 9. Together with a bead 28 formed on the adjacent side wall, this bulbed strip 27 is intended to carry the optional setting plate 6 (Figure 1 ) . As will be seen from Figure 2, the cover 1 has a substantially C-shaped cross section. The ceiling of the cover 1 has fastening means 21 for an optional number of punches 22. The fastening means 21 comprise two axially parallel flanges, the free ends of which each have a bulb 23 directed towards the other flange. The bulbs 23 engage in a recess 24 on the fastening portion of each punch 22. On the side facing away from the punch, the fastening means 21 form a support for the spring means 25 exerting the upwardly directed spring bias on the cover 1. Each punch is assigned a hole 26, which is made by boring through both flat portions 14, 15 of the intermediate unit 8 and the ceiling of the foot unit 7. In an unoperated state, i.e. in the rest position of the hole punch, the punch 22 extends down through the holes in both flat portions 14, 15, such as to be moved past the sheet insertion slit 5 on operating the hole punch by depressing the cover 1 against spring bias, the punch continuing down into the corresponding hole in the ceil¬ ing of the foot unit 7. Three extruded sections, preferably of aluminium, are illustrated in Figure 3, for use in fabricating the cover 1, foot unit 7 and intermediate part 8. The lock¬ ing means 16 is advantageously made from rubber, and the spring means 25 of an elastomer of substantially the same length as the cover 1. Both end walls 3, 4 are advantageously made of compression moulded plastics with a configuration corresponding to the cross section of the hole punch. By providing the plastics end walls with suitable beads or the like, they can be removeably fastened to the bottom part 2. The embodiment described above of the hole punch in accordance with invention has thus a bottom part 2, comprising the assembled intermediate and foot units 8 and 7. The sections for these units may be modified for assembly with an interference fit, the locking means 16 then no longer being needed. In Figures 4 and 5, there are illustrated modified sections 2A and 2B for the bottom part 2 of the hole punch. In this case the sections illustrated in Figures 2 and 3 for the intermediate unit 8 and foot unit 7 are replaced by a single section 2A or 2B, whereby all assembly work for the bottom part 2 is dispensed with. This single section can be formed by extrusion moulding as a single part, or alternatively by extrusion moulding two sections 7B, 8B, which can be rolled together at , according to Figure 5. The inventive hole punch may thus be realized in different ways within the scope of the invention. Apart from its being possible to give the bottom part 2 different embodiments, the diameters of the punches 22 may vary, and thus be even greater than the width between the fastening means 21. Furthermore, the punches 22 may, of course, be centrally attached to the ceiling of the cover, but the fastening means 21 may also be displaced in parallel relative the central axis of the cover so that the punches are given a laterally displaced fixation, The invention may therefore not be regarded as limited to what has been described above and illustrated on the accompanying drawings.

Claims: CLAIMS 1. Device for manual hole punching of paper sheets and the like, including a bottom part (2) , carrying a cover-shaped movably mounted operative member (1 ) in which at least two punches (22) are fastened in register with corresponding holes (26) in the bottom part, the operative member being arranged for pressing down against the bottom part by two opposingly situated legs (19) on the member being guided by side walls (10, 17) arranged on the bottom part, such as to cause the punches to pass through a sheet insertion slit (5), arranged in the bottom part, characterized in that the operative member (1) includes a cover with a substantially C-shaped cross section, the opposing legs (19) of which coact with at least one abutment (18) on the side walls (10, 17) of the bottom part (2) to limit the upward movement of the cover and define its rest position, the punches (22) being fastened to the ceiling of the cover by fastening means along the longitudinal axis of the cover, and in that the spring bias is generated by spring means (25) accommodated in the cover on either side of the punch fastening means such as to engage against the opposing surfaces on the cover and bottom part. 2. Apparatus as claimed in claim 1, characterized in that the fastening means (21) of the cover (1) for the punches (22) are formed by two axially and mutually parallel inwardly thrusting flanges on the ceiling of the cover, the free ends of each having a bulb (23) directed at right angles to said flange and towards the other for engagement in a recess on the fastening portion of the punch, the side of the respective flange facing away from the punch forming support for adjacent spring means (25) . 3. Device as claimed in claim 2, characterized in that the spring means (25) are formed from elastic block material, e.g. an elastomer. 4. Device as claimed in claim 1, characterized in that the bottom part (2) includes a foot unit (7) and an intermediate unit (8) between which the sheet insertion slit (5) is arranged on the outer face of the upper wall of a closed space (9) formed in the foot unit for collecting punch roundels, the foot unit web (10) extending along one long side of said upper wall, from said web there projecting parallel to said web two bulb flanges (11) for coaction with the intermediate unit (8) which is associated with the bottom part and formed with strips (13), engaging with the bulb flanges, said flanges and strips firmly engaging with each other with the aid of an elastic locking means (16) inserted between mutually opposing surfaces on one of the flanges and one of the strips. 5. Device as claimed in claims 2 and 4, characterized in that the cover (1), foot unit (7) and intermediate unit (8) are each formed from an extruded section, the intermediate unit having through holes (23) for guiding the punches (22) fastened to the cover, and in that the foot unit upper wall has corresponding holes in which the punches move on depressing the cover against spring bias from the spring means (25) .

Inventors: LINDBERG BO, LINDBERG, BO
Applicants: LINDBERG BO, LINDBERG, BO
Application year: 1986
Main classification: B26F1
IPC codes: B26D7, B26F1