JPH1176640A - Blade body retraction type cutter knife and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve appearance quality and to reduce a size by preventing the shrinkage in the external shape, such as warpage, at the design surface of a clamping part. SOLUTION: A holder consisting of the clamping part 12 and a guide part 13 fitted into this clamping part 12 is composed. A blade body 16 is supported at this holder retractably from the guide part 13. A blade body housing space 20 is formed by enclosing the inside surface of a recessed part 21 formed along the longitudinal direction of the clamping part 12 and the inside surface of a cap 22 put on this recessed part 21. If such constitute is adopted, the cap 22 is used for the part where the thickness of the clamping part 12 is reduced by accompanying the miniaturization of the cutter knife and, therefore, the nonuniformization of the packing density of the synthetic resin is prevented. The occurrence of the shrinkage in the external shape, such as warpage, at the design surface of the clamping part 12 is thereby averted at the cooling time of a synthetic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter blade retractable cutter knife and a method for manufacturing the same.

[0002]

2. Description of the Related Art In a cutter knife of this kind, a holder has a channel-shaped synthetic resin holding portion and a metal guide portion mounted inside the holding portion. The guide portion of the holder supports a blade body that can protrude and retract from the tip. A blade body accommodating space is formed in the holder, and a spare blade body is accommodated in the blade body accommodating space. When replacing a blade with reduced sharpness with a new blade, a spare new blade is taken out of the blade housing space.

[0003]

However, in order to reduce the size of the cutter body retractable cutter knife in the prior art, it is necessary to partially reduce the thickness of the grip portion in the blade body accommodating space. For this reason, upon cooling after filling with the synthetic resin, a partial difference occurs in the degree of shrinkage of the synthetic resin, and the outer shape shrinks, such as warpage, on the design surface of the grip portion. Therefore, in order to prevent the appearance quality of the gripping portion from deteriorating, the thickness of the gripping portion must be set to a predetermined value or more, and there is a problem that the entire gripping portion becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to prevent appearance shrinkage such as warpage of a design surface of a grip portion, thereby improving appearance quality, The goal is to reduce the size.

[0005]

According to a first aspect of the present invention, there is provided a holder including a grip portion and a guide portion fitted into the grip portion, and the blade body can be protruded and retracted from the guide portion in the holder. And a blade body retractable cutter knife having a blade body accommodating space formed in a holder, wherein the inner surface of a concave portion provided along the longitudinal direction of the grip portion and the inner surface of a lid covered by the concave portion are enclosed. Thus, the gist is that the blade housing space is formed.

According to a second aspect of the present invention, in the cutter knife according to the first aspect, the lid is bonded or welded to the recess. According to a third aspect of the present invention, in the blade knife retractable cutter knife according to the first or second aspect, an engaging portion is provided on one of the lid and the grip portion, and an engaged portion is provided on the other. The gist is that the lid and the gripping portion are joined by the engaging portion being engaged with the engaged portion.

According to a fourth aspect of the present invention, there is provided a holder comprising a grip portion and a guide portion fitted into the grip portion, wherein the holder supports the blade body so as to be able to protrude and retract from the guide portion. In the method for manufacturing a blade body retractable cutter knife having a blade body accommodating space formed therein, the blade body accommodating space is formed by covering a concave portion provided in the grip portion with a lid separate from the grip portion. A method for manufacturing a blade-retractable cutter knife.

According to a fifth aspect of the present invention, in the method of manufacturing a cutter blade retractable cutter knife according to the fourth aspect, the lid is bonded or welded to the concave portion.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 6, the holder 11 includes a grip portion 12 made of a synthetic resin, and a metal guide portion 1 fitted in an attachment groove 12 a of the grip portion 12.
3, and the distal end of the guide 13 protrudes from the distal end of the grip 12. A slide groove 14 is formed on the front side of the guide portion 13 between both ends in the longitudinal direction. A slider 15 made of synthetic resin is movably fitted in the slide groove 14. A blade 16 is accommodated in the slide groove 14. A through hole 16a is formed at the base end of the blade body 16, and the protrusion 15a of the slider 15 is engaged with the through hole 16a, so that the blade body 16 is detachably connected to the slider 15.

[0010] One side edge of the slide groove 14 is provided with a locking uneven portion 1.
Numerals 7 are arranged side by side along the longitudinal direction of the slide groove 14, and a leaf spring (not shown) fitted to the slider 15 is engaged with the locking uneven portion 17. Therefore, when the slider 15 is moved along the slide groove 14 at the time of use, the blade body 16 moves together with the slider 15 while the plate spring is engaged with and disengaged from the locking unevenness portion 17, and projects from the tip of the slide groove 14.

As shown in FIG. 2 to FIG.
Is formed with a blade housing space 20 extending along its longitudinal direction. The blade body housing space 20 includes an inner surface of a concave portion 21 formed on one side of the grip portion 12 along the longitudinal direction,
The cover 21 is formed so as to be surrounded by an inner surface of a lid 22 made of synthetic resin which covers the recess 21. A dovetail 23 is formed on the inner surface of the lid 22 so as to extend in the longitudinal direction of the lid 22. A dovetail groove 24 is formed on both edges of the opening of the concave portion 21 of the grip portion 12, and the dovetail portion 23 is engaged with the dovetail groove 24, whereby the lid 22 is attached to the grip portion 12. Then, in a state where the dovetail portion 24 is engaged with the dovetail groove 24, the periphery of the lid 22 is fixed to the periphery of the concave portion 21 of the grip portion 12 by ultrasonic welding.

As shown in FIGS. 1 to 3 and 6, a cap 18 is provided at the base end of the mounting groove 12a in the grip portion 12. The projection 18a of the cap 18 is engaged with the base end of the mounting groove 12a of the gripper 12, so that the cap 18 is detachable. The cap 18 closes one end of the blade housing space 20.

Now, the operation of the above-structured blade-retractable cutter knife will be described. It is assumed that a spare new blade 16 is stored in the blade housing space 20. The blade 16 with reduced sharpness is replaced with a new blade 1
In the case of replacing with 6, after removing the cap 18,
The slider 15 is pulled out from the base end of the slide groove 14 and the blade body 16 is removed. Then, a new blade body 16 is taken out from the blade body accommodating space 20, the new blade body 16 is mounted on the slider 15, and the slider 15 is inserted into the slide groove 14 and inserted toward the distal end. Thereafter, the old blade body 16 removed from the slider 15 is housed in the blade body housing space 20, and the cap 18 is attached to the grip portion 12.

The blade body accommodating space 20 of the blade body retractable cutter knife is formed as follows. That is, when the distal end of the lid 22 is inserted from the base end of the concave portion 21 in the grip portion 12, the dovetail groove 24 is engaged with the dovetail portion 23, and the concave portion 21 of the grip portion 12 is covered with the lid 22. And the lid 22
Ultrasonic welding along the periphery of the
Fix 2

Next, effects that can be found from the present embodiment will be described below. The inner surface of the concave portion 21 formed in the grip portion 12 and the concave portion 2
The blade body accommodating space 20 was formed by being surrounded by the inner surface of the lid 22 covered by the cover 1. Therefore, it is not necessary to partially reduce the thickness of the grip portion 12 in order to reduce the size of the entire cutter holder. Therefore, by preventing external design contraction such as warpage of the design surface of the grip portion 12, it is possible to improve the external appearance quality and to reduce the size. Further, the blade body accommodating space 20 can be formed by a simple method of covering the concave portion 21 with the lid 22.

Since the lid 22 is ultrasonically welded to the concave portion 21, the lid 22 can be reliably prevented from coming off the grip portion 12. In addition, since the joint between the lid 22 and the grip portion 12 is not visible, the appearance is good.

While the dovetail groove 24 is provided in the grip portion 12,
The dovetail portion 23 is provided on the lid 22, and by engaging the two 23 and 24, the lid 22 is prevented from coming off from the side of the grip portion 12. Accordingly, since the lid 22 can be temporarily fixed to the grip portion 12, ultrasonic welding can be performed smoothly and quickly.

The above embodiment may be configured as follows. -While providing the dovetail part 23 in the grip part 12, providing the dovetail groove 24 in the lid 22. Bonding the lid 22 to the grip 12 with an adhesive; Or, instead of ultrasonically welding or bonding the lid 22, the lid 22
And a locking concave portion is provided in the grip portion 12 so as to correspond to the locking claw. Then, the locking claw is engaged with the locking recess, and the lid 22 is fixed to the grip portion 12.

One end of the lid 22 is rotatably connected to the grip 12 via a thin hinge, and the other end of the lid 22 is
Provide a hook that can be engaged and disengaged. With this configuration,
When removing the blade 16 from the blade housing space 20, the lid 22
Can be taken out in the open position, so that the blade body 16 can be easily taken out.

Next, technical ideas other than the claims that can be grasped from the embodiment will be described together with their effects. (1) The blade body retractable cutter knife according to claim 3, wherein the lid and the gripping part are such that the engaging part and the engaged part are joined in a dovetail relationship. According to this configuration, the lid and the gripper can be joined with a simple configuration.

[0021]

The present invention is configured as described above, and has the following effects. According to the first aspect of the present invention, it is possible to improve the appearance quality and to reduce the size by preventing external contraction such as warpage of the design surface of the grip portion.

According to the second aspect of the present invention, since the lid is bonded or welded to the concave portion, it is possible to reliably prevent the lid from coming off the grip portion. According to the third aspect of the present invention, since the lid is not displaced from the gripping part by the engagement of the engaging part with the engaged part, the lid is more securely prevented from coming off the gripping part. Can be prevented. Further, when the lid is welded or welded to the grip portion, the lid can be temporarily fixed.

According to the fourth aspect of the present invention, the blade body accommodating space can be formed by a simple method of covering the grip portion with the lid. According to the fifth aspect of the present invention, it is possible to reliably prevent the lid from coming off the grip portion by a simple method of bonding or welding the lid to the recess.

[Brief description of the drawings]

FIG. 1 is a front view of a cutter knife showing one embodiment.

FIG. 2 is a rear view of the cutter knife.

FIG. 3 is a bottom view of the cutter knife.

FIG. 4 is a sectional view taken along line AA in FIG. 1;

FIG. 5 is a sectional view taken along line BB in FIG.

FIG. 6 is an exploded perspective view of the cutter knife.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... holder, 12 ... grip part, 13 ... guide part, 16 ... blade body, 20 ... blade body accommodation space, 21 ... recessed part, 22 ... lid, 23
… Dove part (engagement part), 24 ... Dove groove (engaged part)

Claims (5)

[Claims] 1. A holder comprising a grip portion and a guide portion fitted into the grip portion, wherein the blade body is supported by the holder so as to be able to protrude and retract from the guide portion, and a blade body housing space is formed in the holder. A blade body having a blade body housing space formed by surrounding an inner surface of a concave portion provided along a longitudinal direction of the grip portion and an inner surface of a lid covered by the concave portion. A retractable cutter knife. 2. The cutter knife according to claim 1, wherein the lid is bonded or welded to the recess. 3. An engaging portion is provided on one of the lid and the grip portion, and an engaged portion is provided on the other, and the engaging portion is engaged with the engaged portion. The blade-retractable cutter knife according to claim 1 or 2, wherein the lid and the grip are joined. 4. A holder comprising a grip portion and a guide portion fitted in the grip portion, wherein the blade body is supported by the holder so as to be able to protrude and retract from the guide portion, and a blade body housing space is formed in the holder. In the method for manufacturing a blade body retractable cutter knife, the blade body retractable cutter knife is configured to form a blade body accommodating space by covering a concave portion provided in the grip portion with a lid separate from the grip portion. Production method. 5. The method according to claim 4, wherein the lid is bonded or welded to the recess.