Papierlocher

Abstract

Paper punch with a lower part (12) and a pressure lever (24) pivotally mounted on lateral bearing blocks (22) of the lower part (12), the pressure lever (24) acting against the restoring force of a spring (34) on punching tools (33) slidably mounted on the lower part (12), the pressure lever (24) having a cover part (26) pivotally connected to downwardly projecting side walls (28) on the bearing blocks (22) and two pressure bolts (32) for actuating each of the punching tools (33), and the pressure bolts (32) each being attached at a first end (36) to a fastening tongue (40) projecting downwards from the cover part (26) at a distance from one of the side walls (28), characterized in that the pressure bolts (32) each being attached at a second end (46) to the respective side wall (28) and to the respective other side wall (28). are attached to the inner side (48).

Description

[0001] The invention relates to a paper punch according to the preamble of claim 1 or according to the preamble of claim 11.

[0002] Paper punches of the type mentioned above are, for example, marketed by the applicant under the name "LEITZ 5008" and have proven themselves exceptionally reliable in practice. This paper punch has a pressure lever with a sheet metal cover that is pivotally mounted on lateral bearing blocks of the base. The pressure lever also has two pressure pins, each of which acts on a punch and, when the pressure lever is depressed, pushes downwards against the force of a spring to punch a hole in the sheet material resting on a support surface on the base. The pressure pins each pass through a side flange of the cover and are thickened at one end so that they engage behind the outer surface of the side flange.Similarly, a pivot rod, through which the pivot axis runs around which the pressure lever can pivot relative to the lower part, passes through both the bearing blocks and the side walls and is thickened at its ends so that it engages the side walls on their outer surface and is not displaceable. This fastening of the pressure bolts and the pivot rod is very stable, but is often considered a disadvantage from a design perspective.

[0003] It is therefore an object of the invention to further develop a paper punch of the type mentioned above in such a way that it has a more attractive design.

[0004] This problem is solved according to the invention by a paper punch having the features of claim 1, or alternatively by a paper punch having the features of claim 11. Advantageous embodiments of the invention are the subject of the dependent claims.

[0005] The invention is based on the idea of ​​creating a paper punch with a more appealing design by giving the user-facing outer surfaces of the lid a smooth and uniformly colored surface. According to claim 1, the first end of each of the push pins is attached to a mounting tab that projects downwards from the lid in the area between the side panels. The second end of the mounting pins is also not visible from the outside, as it is attached to the respective side panel on its inner surface facing the other side panel. Therefore, it is not necessary to pass the push pin through the side panel to form a widened head on the outer surface of the side panel, so that the push pins are arranged entirely inside the lid between the side panels and are practically invisible to the user.It is preferred that the lid part is made of sheet metal, with the fastening tongues being integrally formed on the lid part. The lid part and the fastening tongues can be manufactured together from a single piece of sheet metal using a forming process, for example, by punching followed by die-cutting or bending. The pressure bolts, also made of metal, can then advantageously be welded to the inner sides of the side walls, preferably using a butt welding process.

[0006] Advantageously, the pressure bolts are each passed through a hole in the respective mounting tongue. This provides a particularly simple way to achieve force transmission from the mounting tongue to the pressure bolt. However, it has been found that butt welding the pressure bolts to the side walls yields unsatisfactory results if a large portion of the welding current flows away through the mounting tongue. For this reason, it is preferred that the holes each have a larger diameter than the pressure bolt, so that when welding the pressure bolt to the respective side wall, the pressure bolt can be held at a distance from the edges of the hole and no welding current flows away through the mounting tongue.To achieve a stable connection between the mounting tongue and the pressure bolt, a sleeve is advantageously inserted through each hole. This sleeve receives the first end of the respective pressure bolt and has a head that engages behind the mounting tongue on its side facing the other mounting tongue. The sleeves can advantageously be permanently connected to the corresponding pressure bolt and / or the corresponding mounting tongue. This allows the pressure bolt to be welded to the corresponding side plate first, without it being in contact with the mounting tongue during the welding process. The sleeve is then inserted through the hole and engages the mounting bolt. The sleeve fills the gap between the pressure bolt and the mounting tongue, creating a stable connection between them.The head prevents the sleeve from slipping through the hole. The connection between the sleeve and the pressure bolt and / or the sheet metal tongue can be made by pressing, welding, or gluing.

[0007] The lid section, with its side panels, advantageously surrounds the bearing blocks on their opposite outer surfaces. This gives the paper punch an attractive design. According to the alternative embodiment of claim 11, the pivotable attachment of the pressure lever to the lower part is achieved by a pivot axis, about which the pressure lever can pivot relative to the lower part, passing through at least one connecting element that extends through the lower part and is attached to the inner surfaces of the side panels. In contrast to the previously known paper punch, in which the pivot axis extends through a pivot axis reaching to the outer surfaces of the side panels, the at least one connecting element according to the invention is again only attached to the inner surfaces of the side panels and is hardly visible to the user.Ideally, both aspects of the invention are combined so that neither the at least one connecting element nor the pressure bolts are visible to the user.

[0008] Two pivot pins are particularly suitable as connecting elements, through which the pivot axis runs, and each of which is rotatably mounted in one of the bearing blocks and firmly connected to the inner side of the corresponding side panel. In particular, it is possible that the pivot pins are welded to the inner sides of the side panels, preferably by butt welding. Advantageously, the pivot pins each engage in a hole in the corresponding bearing block, from which an insertion channel extends, open to a rear area of ​​the lower part. In the manufacture of the paper punch, the pivot pins are first welded to the side panels. Then, the side panels are bent apart a short distance, and the pivot pins are inserted into the holes in the bearing blocks. For this purpose, they are pushed through the insertion channel until they engage in the holes.The insertion channels thus ensure that the holes have a shallower depth towards the rear, i.e., where only small forces act on the bearing blocks from the pivot pins when using the paper punch.

[0009] Alternatively, the pivot axis can extend through a telescopic pivot rod, which is rotatably mounted in both bearing blocks and is pressed against the inner sides of the side walls by the force of a compression spring housed within it. Advantageously, the length of the pivot rod can be reduced against the force of the compression spring so that it can be inserted between the bearing blocks. When the force acting on the pivot rod is removed, it extends due to the restoring force of the compression spring, passes through the holes in the bearing blocks, and is pressed against the inner sides of the side walls, where it is advantageously held in the receptacles surrounding its ends.

[0010] The paper punch can also be advantageously equipped with a locking device. This device comprises a first slider section slidably guided on the pivot rod, a second slider section rigidly connected to it and slidably guided on a guide rod located in the lower part, and a locking element. The locking element is slidable between a locking position, in which it rests against one of the retaining tongues and inhibits its movement, and a release position, in which it releases the retaining tongue. The pressure lever can then be fixed in its depressed position, in which the paper punch assumes its smallest possible size, which is advantageous, for example, for packaging purposes.

[0011] The invention will now be explained in more detail with reference to the exemplary embodiments schematically illustrated in the drawing. The drawing shows... Fig. 1a, Fig. 1b a paper punch according to a first embodiment in perspective view from the rear and in rear view; Fig. 2a, Fig. 2b Parts of the paper punch according to Fig. 1a, Fig. 1b, each partially shown in exploded view; Fig. 3a, Fig. 3b a paper punch according to a second embodiment in a perspective view from behind and in a sectional view and Fig. 4a, Fig. 4b Parts of the paper punch according to Fig. 3a, Fig. 3b.

[0012] The in Fig. 1a, Fig. 1b paper hole punch shown 10 has a lower part 12 up, which is in a front area 14 with a contact surface 16 It is designed for perforating sheets of paper. The underside of the lower part has... 12 a schnitzel tub 18for receiving punched-out paper scraps that extend from the front area 14 up to a gripping cutout 19 in a rear area 20 of the lower part 12 extends. The lower part 12 features two lateral support blocks arranged at a distance from each other 22 on which a pressure lever 24 The pressure lever is pivotally mounted. 24 a lid part 26 made of sheet metal, which forms the bearing blocks 22 side cheeks enclosing their outer sides 28 as well as one in the direction of the rear area 20 free end protruding diagonally upwards 30 features a lever that a user can grip while punching holes to activate the pressure lever. 24 to press down. The pressure lever 24 It also has two pressure bolts 32 made of metal, each mounted on a sliding mechanism in the lower part 12guided punching tool, in the present embodiment a punch 33 , resting on top and when pressing down the free end 30 the relevant punch 33 against the force of a spring designed as a compression spring 34 to penetrate the surface 16 Press down on the overlying leaf material.

[0013] The pressure bolts 32 are, as in Fig. 2b shown in detail, each with its first end 36 through a hole 38 in a space at a distance from the corresponding side cheek 28 one-piece on the lid part 26 molded-on, downward-pointing fastening tongue 40 recorded. The diameter of the holes 38 in the fastening tongues 40 is larger than the diameter of the pressure bolts 32 The first ends 36 the pressure bolt 32 are therefore each by a sleeve 42made of metal, which fit precisely into the hole 38 the relevant fastening tongue 40 is inserted and has a fastening tongue. 40 on their other fastening tongue 40 facing side, reaching behind head 44 exhibits at its second end 46 is each of the pressure bolts 32 on an inside 48 the corresponding side cheek 28 welded to the other side panel 28 is facing towards. For this purpose, the side cheeks are 28 on their inner sides 48 each with a depth 50 provided with a mandrel inserted before the welding process begins 52 at the second end 46 of the relevant pressure bolt 32 intervenes, forming excess material that is melted during welding and interacts with the associated side panel. 28 connects. In addition, the pressure bolts 32still with their casings 42 connected, each of which in turn is firmly attached to the corresponding fastening tongue. 40 It is connected. Welding processes are also suitable for this fastening, as are gluing or pressing.

[0014] For pivotable attachment of the pressure lever 24 on the lower part 12 indicates the paper punch 10 according to the first embodiment, two pivot pins 54 made of metal, each rotatable in a hole 56 in one of the bearing blocks 22 are mounted, and through which the pivot axis runs, around which the pressure lever 24 opposite the lower part 12 Each of the pivot pins is pivotable. 54 is on the inside 48 one of the side cheeks 28 welded on. For this purpose, the inner sides are welded. 48 each one further depth 58arranged, into which there is an excess of material in the form of another mandrel 60 at the pivot pin 54 intervenes, which melts during welding and is attached to the side wall. 28 is connected. From each of the holes 56 in the bearing blocks 22 extends to the rear area 20 open insertion channel 62 towards the rear area 20 , over which the pivot pins 54 during the assembly of the paper hole punch 10 into the holes 56 to be inserted. For this purpose, the lid part 26 in the area of ​​the side cheeks 28 bent apart a little and elastically deformed until the pivot pins 54 into the insertion channels 62 can be inserted. Then the pressure lever 24 advanced until the pivot pins 54 into the holes 56 in the bearing blocks 22can intervene. The engagement of the pivot pins 54 into the holes 56 This is achieved through an elastic restoring force acting on the side walls. 28 it works, or by bending back the side cheeks 28 .

[0015] The paper punch 110 according to the second embodiment ( Fig. 3a to Fig. 4b) corresponds in most components to the paper hole punch. 10 according to the first embodiment. Identical features are therefore identified by the same reference numerals and are mostly not described in detail below.

[0016] At the paper punch 110 According to the second embodiment, the pivot axis around which the pressure lever runs 24 opposite the lower part 12 is pivotable, not by two pivot pins 54 , but by means of a swivel rod 64 The swivel rod 64 runs through the holes56 in the bearing blocks 22 and lies with its ends on the inner sides 28 the side cheeks 28 on. The ends of the swivel rod 64 are located within circular recording borders 66 on the side cheeks 28 They fit precisely so that they cannot slip radially. The swivel rod 64 It is multi-part and telescopic. As can be seen particularly in the exploded view in Fig. As shown in 4a, a first part 68 and one into the first part 68 intervening and movable second part guided within it 70 up. The length of the swivel rod 64 can be achieved by moving the two parts 68 , 70 against each other against the restoring force of one in the first part 68 absorbed compression spring 72 will be reduced. During the assembly of the paper punch 110 First, the swivel rod will be64 through the holes 56 in the bearing blocks 22 This is done. Then their length is adjusted by compressing them against the restoring force of the compression spring. 72 reduced, so that the pressure lever 24 on the lower part 12 can be placed on it, with the side cheeks 28 the bearing blocks 22 grasp. Finally, the swivel bar 64 released, so that the force of the compression spring 72 their two parts 68 , 72 against the inner sides 48 the side cheeks 28 presses, with its ends in the recording edges 66 are recorded.

[0017] In summary, the following can be stated: The invention relates to a paper hole punch. 10 , 110 with a lower part 12 and with one on lateral bearing blocks 22 of the lower part 12 swivel-mounted, on the lower part 12slidingly mounted punching tools 33 each against the restoring force of a spring 34 acting pressure lever 24 , wherein the pressure lever 24 a downward-facing side panel 28 swiveling with the bearing blocks 22 connected lid part 26 and two pressure bolts 32 to actuate one of the punching tools each 33 features and wherein the pressure bolts 32 each with a first end 36 at a distance from one of the side cheeks 28 from the lid part 26 downward-pointing mounting tongue 40 are fastened. According to the invention, it is provided that the pressure bolts 32 each with a second end 46 on the affected side cheek 28 on the opposite side cheek 28 facing inside 48 are attached.

Claims

[1] Paper punch with a lower part (12) and a pressure lever (24) pivotally mounted on lateral bearing blocks (22) of the lower part (12), the pressure lever (24) acting against the restoring force of a spring (34) on punching tools (33) slidably mounted on the lower part (12), the pressure lever (24) having a cover part (26) pivotally connected to the bearing blocks (22) on downwardly projecting side cheeks (28) and two pressure bolts (32) for actuating each of the punching tools (33), and the pressure bolts (32) each being attached at a first end (36) to a fastening tongue (40) projecting downwards from the cover part (26) at a distance from one of the side cheeks (28), characterized by , that the pressure bolts (32) are each attached with a second end (46) to the respective side cheek (28) on its inner side (48) facing the other side cheek (28). [2] Paper punch according to claim 1, characterized by, that the lid part (26) is made of sheet metal. [3] Paper punch according to claim 2, characterized by , that the fastening tongues (40) are integrally formed on the lid part (26). [4] Paper punch according to claim 2 or 3, characterized by , that the pressure bolts (32) are made of metal and are welded to the insides (48) of the side walls (28), preferably by butt welding. [5] Paper hole punch according to any of the preceding claims, characterized by that the pressure bolts (32) are each passed through a hole (38) in the respective fastening tongue (40). [6] Paper punch according to claim 5, characterized by that the holes (38) in the fastening tongues (40) each have a larger diameter than the inserted pressure bolt (32). [7] Paper punch according to claim 6, characterized by, that a sleeve (42) receiving the first end (36) of the respective pressure bolt (32) is passed through the holes (38) in the fastening tongues (40), which has a head (44) engaging behind the respective fastening tongue (40) on its side facing the other fastening tongue (40). [8] Paper punch according to claim 7, characterized by that the sleeves (42) are each firmly connected to the associated pressure bolt (32) and / or to the associated fastening tongue (40). [9] Paper punch according to any of the preceding claims, characterized by , that the lid part (26) with its side cheeks (28) encompasses the bearing blocks (22) on their outer sides facing away from each other. [10] Paper punch according to claim 9, characterized by, that the pressure lever (24) is pivotable about a pivot axis relative to the lower part (12) which passes through at least one connecting element (54, 64) which passes through the lower part (12) and is attached to the inner sides (48) of the side walls (28). [11] Paper punch with a lower part (12) and a pressure lever (24) pivotally mounted on lateral bearing blocks (22) of the lower part (12), the pressure lever acting on punching tools (33) slidably mounted on the lower part (12) against the restoring force of a spring (34), wherein the pressure lever (24) has a cover part (26) pivotally connected to the bearing blocks (22) on downwardly projecting side cheeks (28), the cover part (26) encompassing the bearing blocks (22) on their opposite outer sides with its side cheeks (28), characterized by, that the pressure lever (24) is pivotable about a pivot axis relative to the lower part (12) which passes through at least one connecting element (54, 64) which passes through the lower part (12) and is attached to the inner sides (48) of the side walls (28). [12] Paper punch according to claim 10 or 11, characterized by , that the pivot axis passes through two pivot pins (54), each of which is rotatably mounted in one of the bearing blocks (22) and is firmly connected to the inside (48) of the associated side wall (28). [13] Paper punch according to claim 12, characterized by , that the pivot pins (54) are welded to the inner sides (48) of the side walls (28), preferably by butt welding. [14] Paper punch according to claim 12 or 13, characterized by, that the pivot pins (54) each engage in a hole (56) in the associated bearing block (22), from which an insertion channel (62) extends open to a rear area (20) of the lower part (12). [15] Paper punch according to claim 10 or 11, characterized by , that the pivot axis runs through a telescopic pivot rod (64) which is rotatably mounted in both bearing blocks (22) and is pressed against the inner sides (48) of the side walls (28) by the force of a compression spring (72) contained in it. [16] Paper punch according to claim 15, characterized bya locking device comprising a first slide part slidably guided on the pivot rod (64), a second slide part rigidly connected to it and slidably guided on a guide rod arranged in the lower part (12), and a locking part, wherein the locking device is slidable between a locking position in which the locking part rests against one of the fastening tongues (40) and inhibits its movement, and a release position in which the locking part releases the fastening tongue (40).

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