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Patent Searching and Data


Title:
PUNCH FOR PAPER AND THE LIKE
Document Type and Number:
WIPO Patent Application WO/1994/026481
Kind Code:
A1
Abstract:
Punch for paper comprising a bottom part (10) with a punch die, an entering slot (11) for the material to be perforated, and punch guides, for the punches of the punch, and a top part (12) hingedly connected to the bottom part and designed as a pressure plate. As extruded, both the bottom part (10) and the top part (12) are designed with a continously running channel (14, 15), wherein, alternately on the bottom part (10) and the top part (12), certain parts of the channels (14, 15) are removed so that remaining parts on one part may enter into the space between remaining parts on the other part to form a hinge, into which an axle (16) is entered.

Inventors:
EKLUND ARNE (SE)
Application Number:
PCT/SE1994/000446
Publication Date:
November 24, 1994
Filing Date:
May 11, 1994
Export Citation:
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Assignee:
SAMHALL OFFICE AB (SE)
EKLUND ARNE (SE)
International Classes:
B26F1/36; E05D15/14; (IPC1-7): B26F1/32
Foreign References:
DE3226954C21987-10-29
FR2091220A51972-01-14
DE3716405C21991-05-23
DE4208414A11993-09-23
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Claims:
Claims
1. A holepunch, particularly for paper and paper goods, comprising a bottom part (10) having a punch matrix, an ente¬ ring slot (11) for the material to be perforated, and punch guides for the punches of the holepunch, and a top part (12) which is pivotally connected to the bottom part (10), and is designed as a pressure plate, characterized in that the bottom part (10) is provided with a channel (14) that runs conti¬ nuously by the extrusion, whereas the top part (12) in a simi¬ lar manner is provided with a channel (15) that runs conti¬ nuously by the extrusion, and that some portions of the chan¬ nels (14,15) alternatingly on the bottom part (10) and the top part (12) are removed to permit remaining portions of one part to enter into the spaces between remaining portions of the other part to form a hinge, into which a shaft (16) is intro¬ duced.
2. A holepunch as claimed in claim 1, characterized in that the channel (14) of the bottom part (10) has the shape of a forwardly and slightly upwardly open slot, having an essen¬ tially circular crosssection, whereas the channel (15) of the top part (12) has the shape of a rearwardly and slightly down¬ wardly open slot, having an essentially circular crosssec¬ tion.
3. A holepunch as claimed in claim 1 or claim 2, charac¬ terized in that at least a portion of the outer end of the upper part (12) is covered by a cover plate (16) wherein one half of the shaft (15) of the holepunch is affixed.
Description:
PUNCH FOR PAPER AND THE LIKE

The present invention relates to a hole-punch for paper and the like.

A previously known punch (DE 32 30 132 C2) , particularly for paper and paper goods, comprises a bottom part with a punch die, an entering slot for the material to be perforated, and punch guides for the punches of the hole-punch, and a top part which is pivotally but shaft-free connected to the bottom part, and is designed as a pressure plate.

The characterizing feature of this previously known hole- punch is that the top portion and the bottom portion are de¬ signed as separate, pressed or extruded details, and that for the shaft-free connection of these portions to each other one portion has a longitudinal inlet slot, into which fits a pivot extension of the other portion, which extension has its cross- section adapted to that of the inlet slot, is insertable into the slot, and is retained therein with some play.

In simple terms the known hole-punch may be said to have a hinge in the shape of an elongated male/female coupling. In certain cases, in practise, such a hinge has been found to be slightly sluggish.

The present invention aims at remedying the just mention¬ ed problem, and to that end the hole-punch according to the invention is characterized essentially in that the bottom part is provided with a channel that runs continuously by the ex¬ trusion, whereas the top part in a similar manner is provided with a channel that runs continuously by the extrusion, and that some portions of the channels altematingly on the bottom part and the top part are removed to permit remaining portions of one part to enter into the spaces between remaining por¬ tions of the other part to form a hinge, into which a shaft is introduced.

According to the invention it is preferred that the chan¬ nel of the bottom part has the shape of a forwardly and slightly upwardly open slot, having an essentially circular cross-section, whereas the channel of the top part has the shape of a rearwardly and slightly downwardly open slot, ha¬ ving an essentially circular cross-section.

The invention will be disclosed in more details below with reference to the accompanying drawing.

Fig. 1 is a perspective view of one end of a hole-punch according to the invention, picked as an example;

Fig. 2 is a perpective view corresponding to fig. 1, whe¬ re a portion of the top part has been broken away;

Fig. 3 illustrates a modification of the hole-punch.

The hole-punch a shown, which is adapted to be used par¬ ticularly for paper and paper goods, comprises a bottom part

10 having a punch matrix, an entering slot 11 for the material to be perforated, punch guides (not shown) for the punches, similarly not shown, and a top part 12, which is pivotally connected to the bottom part 10 and is designed as a pressure plate. At its lowermost surface the top part 12 has a longi¬ tudinal slot 13, into which ball shaped upper ends of the punches engage to be moved upwardly and downwardly, respec¬ tively, as the top part 12 pivots, in order to perforate the material that has been entered into the slot 11.

The bottom part 10 has a channel 14 that runs conti¬ nuously by the extrusion, which channel is formed as a for- wardly and slightly upwardly open slot having an esentially circular cross-section.

In a similar manner, the top part 12 has a channel 15 that runs continuously by the axtrusion and has the shape of a rearwardly and slightly downwardly open slot, having an essen- tilly circular cross-section.

By the mounting certain portions of the channels 14, 15 are cut way and removed, alternatingly on the bottom part 10 and the top part 12, so that the remaining portions on one part may enter the spaces between remaining portion on the other part. In this manner a hinge is formed, into which a shaft 16 may be introduced and be retained therein in a suit¬ able manner.

As is shown in fig. 3 it is also possible to provide at least one end of the hol-punch with a covering plate 16, whe¬ rein one half of the shaft 15 of the hole-punch is affixed.