JPH09155796A - Punch for office work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the novel punch for office work, on which improvement is made to eliminate structural defects. SOLUTION: A movable side plate 2 is connected with a fixed side plate 1 in such a way as to be freely opened/closed at the rear side periphery of the stationary side plate, cutting edge holes 16 and 17 are provided for the side plate 1, and fixedly attaching pins 18 and 19 are also provided for the movable side plate 2 at places corresponding to the aforesaid cutting edge holes 16 and 17. Separately from the aforesaid items, cutting edge bodies 23 and 24 are formed out of rigid synthetic resinous material where four cutting edges in a substantial triangular pyramid shape each are projected in a state that these cutting edges are in a continuous condition while being located in the four directions, and also in a state that one side surface of each triangular cone is formed into the extended surface of the outer circumferential surface of a cylindrical body, in the tip end surface of the cylindrical body of an outer circumferential diameter fairly smaller than the diameter of each cutting edge hole 16 and 17. The inner diameter holes of the cutting edge bodies 23 and 24 are fitted to the fixedly attaching pins 18 and 19, and the cutting edge bodies 23 and 24 are fixed onto the movable side plate 2 by crushing and widening the tip ends of the fixedly attaching pins 18, 19 with these tip ends heated up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin office punch, and more particularly to an office punch mainly having a modified cutting blade structure.

[0002]

2. Description of the Related Art Conventionally, there has been known an office punch in which a cutting blade body is integrally projected from a movable side plate, and a cylindrical tip end surface is ground into an arc surface to form a pair of left and right cutting edges. Office punches with blades are known, but the former is composed of movable and fixed side plates when a hard material is used to improve the sharpness of the cutting blade body that is integrally projected from the movable side plate. However, when the material is made somewhat soft to facilitate the construction of the movable side plate and the fixed side plate, the cutting edge becomes inferior in sharpness, and the latter has a hole cut by the cutting blade body part. Since it started to be cut from two sides, it had poor sharpness, and the cut holes did not finish cleanly.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new office punch which is devised to eliminate the above-mentioned structural inconvenience.

[0004]

In order to achieve the above object, an office punch according to the present invention comprises a movable side plate 2 which is slidably mounted on a rear edge of a fixed side plate 1 and a cutting blade is attached to the fixed side plate 1. The holes 16 and 17 are also provided in the movable side plate 2 as the cutting edge holes 16 and 1.
7 are provided with fastening pins 18 and 19 at positions corresponding to 7 respectively, and separately from this, a substantially triangular pyramid shape is provided on the tip surface of a cylindrical body 21 having an outer diameter slightly smaller than the diameter of the cutting edge holes 16 and 17. The four cutting blades 22 having the shape are projected in a state in which these cutting blades 22 are continuous, in a state in which they are located on all sides, and in which one side surface of the triangular pyramid forms an extension surface of the outer peripheral surface of the cylindrical body 21. The cutting blades 23, 24 are made of a hard synthetic resin material, and the inner diameter holes 26 of the cutting blades 23, 24 are fitted into the fastening pins 18, 19 and the fastening pins 18, 19,
The cutting blade bodies 23 and 24 are fixed to the movable side plate 2 by crushing and expanding the tip of 19 by heating.

[0005]

The embodiment shown in the drawing is a main body in which a movable side plate 2 is continuously connected to a rear side edge of a fixed side plate 1 via a bendable portion using a hard thermoplastic synthetic resin material having a slight elasticity. 3 is formed, and large square holes 4 and 5 are opened in the central portions of the fixed side plate 1 and the movable side plate 2, and a rising portion 6 is formed at the rear cutting edge of the square hole 4 on the side of the fixed side plate 1 and the rising portion. Forward projecting portions 7 are integrally provided on the upper edge of 6 to form a groove 9 for setting the perforated object 8, while the other movable side plate 2 is provided.
The square hole 5 of the above-mentioned structure functions as an escape hole for the rising portion 6 and the projecting portion 7, and the hook-shaped engaging projections 10, 11 and the engaging portions are provided at the left and right portions of the fixed side plate 1 and the movable side plate 2 on the rear side. The hook-shaped portions 14 and 15 at the tips of the hook-shaped engaging projections 10 and 11 are fitted into the engaging holes 12 and 1, respectively.
It is provided integrally as a state of engaging with the engaging edges 12 and 13 after coming into contact with the cutting edge of No. 3, and a pair of left and right cutting edge holes 16 and 17 is provided at the front side portions on both left and right sides of the fixed side plate 1. Then
In the movable side plate 2, fastening pins 18 and 19 are integrally erected at the locations corresponding to the cutting edge holes 16 and 17, and separately from this, an outer diameter of slightly smaller than the diameter of the cutting edge holes 16 and 17 is provided. Four cutting blades 22 having a substantially triangular pyramid shape are provided on the front end surface of the cylindrical body 21 in a state in which these cutting blades 22 are continuous, in a state of being positioned in four directions, and one side surface of the triangular pyramid is the cylindrical body 21.
A pair of cutting blades 23, 24 protruding so as to form extended surfaces of the outer peripheral surface of the cutting blades 23, 24 are made of a hard synthetic resin material.
Each of the cutting blade bodies 23, 2 is fitted into the cutting edge body 8 and 19 and the tips of the fastening pins 18 and 19 are crushed and expanded by heating.
4 is fixed to the movable side plate 2, and further, in the movable side plate 2, the attachment points of the cutting blade bodies 23 and 24 and the hook-shaped engagement projections 10 and 11 are attached.
The point 25 on the horizontal line that crosses the point where the above is provided is made thin so that the point 25 can be bent, and a pair of left and right mounting holes 27 are opened at the rear side of the fixed side plate 1.
In the figure, reference numeral 29 is a non-slip surface, and 30 is a triangular mark for indicating the center position.

The above embodiment is used, for example, as follows. That is, first, the movable side plate 2 is erected to be in an open state (see FIG. 1), and in this opened state, the perforated object (paper) 8 is set in the setting groove portion 9, and then the movable side plate 2 is tilted and hooked. The thin ends of the movable side plates 2 are formed by bringing the tips of the engagement protrusions 10 and 11 into contact with the cut edges of the engagement holes 12 and 13 (see the phantom line in FIG. 7) and applying a pressing force to the movable side plates 2. The outside of the point 25 on the horizontal line is bent to be in a state parallel to the fixed side plate 1 (see the solid line in FIG. 7), and the above pressing force is continuously applied, whereby the cutting blades 22 and the cutting blades 23 and 24 are cut. The holes 16 and 17 start cutting from the four sides of the holed object 8 to open the binding holes, and the chips are discharged downward from the cutting edge holes 16 and 17.

[0007]

As described above, the office punch according to the present invention is movable on the rear side edge of the fixed side plate 1 so as to be movable.
And the fixing side plates 1 are provided with cutting edge holes 16 and 17, and the movable side plate 2 is provided with fastening pins 18 and 19 at positions corresponding to the cutting edge holes 16 and 17, respectively. Four cutting blades 22 having a substantially triangular pyramid shape are provided on the front end surface of a cylindrical body 21 having an outer peripheral diameter slightly smaller than the diameters of the blade holes 16 and 17, and these cutting blades 22 are continuous with each other and are positioned in four directions. And a cutting blade body 2 protruding so that one side surface of the triangular pyramid forms an extension surface of the outer peripheral surface of the cylindrical body 21.
3, 24 are made of a hard synthetic resin material, the inner diameter holes 26 of the cutting blades 23, 24 are fitted into the fastening pins 18, 19 and the tips of the fastening pins 18, 19 are crushed and expanded by heating. Therefore, the cutting blades 23, 24 are fixed to the movable side plate 2, so that the cutting blades 23, 24
24 can be made of a hard material different from the fixed side plate 1 and the movable side plate 2, and the cutting blade bodies 23, 24
Is a device in which the cutting holes 22 provided in a four-way arrangement are used to start cutting from four sides to open the binding holes, and the above-mentioned inconvenience can be sufficiently eliminated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an office punch according to the present invention.

FIG. 2 is a perspective view showing a state in which a movable side plate is closed.

FIG. 3 is a sectional view taken along the line AA of FIG. 2;

FIG. 4 is a sectional view taken along the line BB in FIG. 2;

FIG. 5 is a sectional view taken along the line CC of FIG. 2;

FIG. 6 is a perspective view showing a state in which a movable side plate is partially closed.

FIG. 7 is a sectional view taken along the line DD in FIG. 6;

FIG. 8 is a cross-sectional view taken along the line E-E of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed side plate 2 Movable side plate 3 Main body 4, 5 Square hole 6 Standing part 7 Overhanging part 8 Opening hole 9 Set groove part 10, 11 Engagement protrusion 12, 13 Engagement hole 14, 15 Hook-shaped part 16, 17 Cut Blade hole 18, 19 Fastening pin 21 Cylindrical body 22 Cutting blade 23, 24 Cutting blade body 25 Horizontal line location 26 Inner diameter hole 27 Mounting hole 29 Non-slip irregularity 30 Triangle mark

Claims (1)

[Claims] 1. A movable side plate 2 is provided continuously on the rear edge of the fixed side plate 1 so as to be freely slidable, and the fixed side plate 1 has cutting edge holes 16 and 17, and the movable side plate 2 corresponds to the cutting edge holes 16 and 17. In addition to providing the fastening pins 18 and 19 respectively, the four pins each having a substantially triangular pyramid shape are provided on the tip end surface of the cylindrical body 21 having an outer peripheral diameter slightly smaller than the diameter of the cutting edge holes 16 and 17 separately. The cutting blades 22 are in a state in which these cutting blades 22 are in a continuous state, in a state in which they are located on all sides, and one side surface of the triangular pyramid is the cylindrical body 2.
The cutting blades 23, 24 protruding so as to form an extended surface of the outer peripheral surface of No. 1 are made of a hard synthetic resin material, and the inner diameter holes 26 of the cutting blades 23, 24 have the fastening pins 18, 1
An office punch, characterized in that the cutting blade bodies (23, 24) are fixed to the movable side plate (2) by being fitted to the fastening pin (9) and crushing and expanding the ends of the fastening pins (18, 19) by heating.