JPH05212162A - Shank of cutting tool - Google Patents

Abstract

PURPOSE:To position a flange piece of metal certainly through the use of a spacer by forming a grip in the condition that the spacer is fitted on a core piece. CONSTITUTION:A groove 10 is formed between both of side plates 12 of a spacer 9 made of a highpolymer material, and a flange piece 18 of metal is fitted on an insert 19 where a core piece 1 extended from the body 2 of a cutting tool is fitted in the groove 10, and the flange piece 18 is supported by supporting parts 17 outside of the side plates 12 of spacer 9. A molding space is formed between the inner surface of the flange piece 18 and the periphery of the spacer 9, and highpolymer material is put in molding space in the flange piece 18 and the periphery of the insert 19 so as to form a grip part. Accordingly, it is not likely that a large wall thickness part is produced at the grip 20 owing to both side plates 12, that prevents generation of shrinkage cavities, etc., and the flange piece 18 can be located certainly when the grip 20 is molded in a single piece with the insert 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a handle having a mouthpiece such as a knife and a knife.

[0002]

2. Description of the Related Art Conventionally, in a handle of this type, as shown in FIGS. 13 and 14, for example, a core 1 extending continuously from a blade 2 made of metal is inserted into a cavity in a mold. The core 20 is made of a polymer material.
Is integrally formed on the outer periphery of the.

The width and thickness of the grip 20 and the dimensional ratio between them are limited to some extent by the conditions such as the ease of gripping the grip 20, so that the relationship with the core 1 in the form of a thin plate. The thickness of the gripping portion 20 along the thickness direction of the upper and the core 1 is the core 1
It was larger than the wall thickness of the gripping portion 20 along the width direction of.

However, if the gripping portion 20 has a partial thick portion, the balance between the volume decrease of the molten plastic compressed in the mold due to the temperature decrease and the volume increase due to the pressure decrease is lost. However, there is a risk that sink marks may occur on the surface of the grip portion 20 or cavities may occur inside the grip portion 20.

By the way, there are some which have the base 18 like the handle shown. A space between the inner surface of the mouthpiece 18 and the outer peripheral surface of the core 1 is filled with a filling portion 20 a continuous with the grip portion 20.

[0006]

As described above, when the grip 20 is integrally formed on the outer periphery of the core 1, the mouthpiece 18 must be positioned on the core 1. For that purpose, some positioning means must be provided between the core 1 and the base 18.

The applicant of the present invention has provided a handle of a blade according to Japanese Patent Application No. 3-51401. Although not shown, the handle of the blade includes an insert portion including a core and a spacer, and a grip portion formed by integrally molding a polymer material on the outer periphery of the insert portion. This spacer is composed of a bottom plate and both side plates rising from both sides thereof, and a groove is formed between them. The core is fitted in this groove.

As described above, when the grip portion is formed with the spacer fitted to the core, even if the thickness of the core is smaller than the thickness of the grip portion, both sides of the spacer are formed. The thickness of the grip portion along the thickness direction of the core can be reduced by the thickness of the plate portion. Therefore, a thick portion is less likely to be formed in the grip portion, and sink marks and cavities can be prevented from occurring.

The applicant of the present invention has noticed that such a spacer can be effectively used as the mouthpiece positioning means. Therefore, the present invention is one in which the base is reliably positioned using this spacer.

[0010]

As shown in the drawings of the embodiments described below, in a handle according to the present invention, a spacer 10 made of a polymer material is provided with a groove 10 between both side plate portions 12, A core 1 extending from the blade 2 is fitted into the groove 10 to form an insert portion 19. The base 18 is fitted around the outer periphery of the insert portion 19. A support portion 17 is formed outside the both side plate portions 12 of the spacer 9, and the base 18 is supported by the support portion 17. This base 18
A molding space F is formed between the inner surface of the spacer and the outer peripheral surface of the spacer 9. Outer periphery of the insert portion 19 and the base 1
The polymer material is molded in the molding space F inside the gripping portion 20.
It has become.

[0011]

In the present invention, since the gripping portion 20 is molded with the spacer 9 fitted to the core 1, the thickness L of the core 1 is made smaller than the thickness of the gripping portion 20, for example. Even
The thickness of the gripping portion 20 along the thickness direction of the core 1 can be reduced by the thickness of both side plate portions 12 of the spacer 9.

Further, the spacer 9 having such a function
By the support portion 17 formed on the outer side of the both side plate portions 12 of
Since the base 18 is supported, the spacer 9 can also be used as a positioning means for the base 18. Moreover, since a forming space F is formed between the outer peripheral surface of the spacer 9 and the inner surface of the die 18, when the gripping portion 20 is integrally molded on the outer periphery of the spacer 9, the molding space F is also filled with the filling portion 20a. The base 18 is securely fixed to the core 1 together with the spacer 9.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENT A handle of a cutting tool according to an embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the core 1 extends from the base end of the blade 2, and they are integrally formed by a thin metal plate and are continuous with each other. The vertical width of the core 1 is narrower than the vertical width of the base end of the blade 2, and a step 3 is formed between the back side of the base end of the blade 2 and the upper edge of the core 1. And the jaw 4 formed on the ventral side of the base end of the blade 2.
Two step portions 5 and 6 are formed between and the lower edge of the core 1. A locking recess 7 is formed in the central portion of the lower edge of the core 1 in the longitudinal direction, and stopper holes 8 are formed in the core 1 on both sides of the locking recess 7.

The spacer 9 is separated from the core 1 and is molded in advance from a polymer material such as plastic.
The spacer 9 is formed with a groove 10 extending from the front end to the base end side. The groove 10 forms a bottom plate portion 11 and both side plate portions 12 rising from both sides thereof.
As shown in FIG. 2, the bottom plate portion 11 is formed with a lower end opening 10 a that opens the inner bottom of the groove 10. At the tip opening 10b of the groove 10, locking projections 13 extending in the vertical direction are formed on the inner surfaces of both side plate portions 12 so as to face each other. In addition, the bottom plate portion 11 is formed in the groove 10 at the central portion in the longitudinal direction.
A locking projection 14 is formed over the inner surfaces of the both side plate portions 12, and locking projections 15 extending in the vertical direction are opposed to the inner surfaces of the both side plate portions 12 on both sides of the locking projection portion 14. Is formed. A pair of stopper holes 16 are also provided in the side plate portions 12 so as to face each other.

Particularly, a supporting portion 17 is provided so as to protrude outside the both side plate portions 12 in the vicinity of the tip end opening 10b of the groove 10 of the spacer 9. The metal base 18 has a tubular shape and is supported by both supporting portions 17 of the spacer 9 when the distal end portion of the spacer 9 is inserted as shown in FIG.

As shown in FIG. 3, the groove 10 of the spacer 9 is shown.
The cores 1 are fitted to the inserts 19 to form the insert parts 19. In this insert portion 19, as shown in FIG. 4, the lower edge of the core 1 abuts on the bottom plate portion 11 so that the locking concave portion 7 of the core 1 is fitted into the locking convex portion 14 on the bottom plate portion 11. In addition, as shown in FIGS. 5 and 6, the core 1 is held between the locking projections 13 and 15 on the inner surfaces of the side plate portions 12,
A gap S is formed between the core 1 and the inner surfaces of the side plate portions 12 except for the contact portion between them. In addition,
The stepped portion 6 continuing to the lower edge of the core 1 is the tip opening 1 of the groove 10.
It is located at 0b.

The mouthpiece 18 is inserted into the outer periphery of the insert portion 19, is supported by both support portions 17 thereof at the tip portion of the spacer 9, and the step portion 3 of the blade 2 is also supported.
It is in contact with 6. A spacer 9 is provided inside the base 18.
A molding space F is formed between the core 1 and the core 1.

The insert portion 19 is inserted into the cavity in the mold. When a polymer material such as plastic is injected into this cavity, a grip 20 is integrally formed on the outer periphery of the insert 19 as shown in FIGS. The gap S in the groove 10 and the lower end opening 10a thereof are filled. Also, the base 18
The inner molding space F is filled with a filling portion 20a that is continuous with the grip portion 20, and the respective stop holes 8 and 16 are also filled with a polymer material to form a connecting shaft portion 20b. The step portions 3 and 6 of the blade 2 are also continuously filled in the grip portion 20.

As described above, since the gripping portion 20 is integrally molded with the spacer 9 fitted to the core 1, the thickness of the core 1 is smaller than that of the gripping portion 20 as shown in FIG. Even if the thickness L is reduced, the thickness of the grip portion 20 along the thickness direction of the core 1 can be reduced by the thickness of both side plate portions 12 of the spacer 9. Therefore, a thick portion is less likely to occur in the grip portion 20, and sink marks and cavities are prevented from occurring.

Further, as shown in FIG. 6, the thickness L of the core 1 is
Is smaller than the thickness M of the groove 10 and is substantially the same as the interval N between the locking projections 13 and 15. Therefore, the core 1 is sandwiched between the locking projections 13 and 15 for positioning, and the locking recess 7 of the core 1 is positioned by engaging with the locking projection 14 on the bottom plate 11. It Due to a molding error, the thickness L of the core 1 causes each locking projection 13,
If the core 1 is inserted between them when the distance N is larger than the interval N between the two, the metal-made core 1 scrapes the respective locking ridges 13 and 15 made of plastic, or The plate portions 12 are spread apart from each other due to their elasticity,
The core 1 is sandwiched between the locking projections 13 and 15, and is reliably positioned to prevent rattling. Thus, the thickness M of the groove 10
Even if a slight error occurs in the thickness L of the core 1 within the range of, the spacer 9 does not have to be changed according to the thickness L of the core 1 and the same one can be used. -The versatility of the service 9 is improved.

Particularly, in this embodiment, since the mouthpiece 18 is supported by the support portions 17 formed outside the side plate portions 12 of the spacer 9 having such a function, the spacer 9 is supported. Can also be used as the positioning means for the mouthpiece 18, and no special positioning means is required between the core 1 and the mouthpiece 18, and the structure thereof can be simplified. Moreover, space
Since a molding space F is formed between the outer peripheral surface of the spacer 9 and the inner surface of the die 18, when the gripping portion 20 is integrally molded on the outer periphery of the spacer 9, the molding space F is also filled with the filling portion 20a, 18 is securely fixed to the core 1 together with the spacer 9. Further, since the retaining pin cannot be seen at all on the outer periphery of the grip portion 20, it is preferable in appearance.

In another example of the mouthpiece 18 shown in FIGS. 11 and 12, the shape of the core insertion hole 18a is changed at one end side which abuts on both the step portions 3 and 6 of the blade 2.

[0024]

The blade handle according to the present invention has a space
By the action of both side plate portions 12 of the server 9, not only the thick portion is less likely to be generated in the grip portion 20 to prevent sink marks and cavities, but also the spacer 9 is effectively used to support the mouthpiece 18. At the same time, since the molding space F is formed between them, when the gripping portion 20 is integrally molded with the insert portion 19, the mouthpiece 18 can be reliably positioned, and the filling portion 20a in the molding space F secures the mouthpiece 18. Can be fixed to.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing a core, a spacer, and a base according to this embodiment.

FIG. 2 is a partial sectional view of this spacer.

FIG. 3 is a partial perspective view showing a state where the spacer is fitted to the core and the mouthpiece is fitted to the insert portion.

FIG. 4 is a partial sectional view of the same.

5 (a) is an enlarged sectional view taken along line AA of FIG.
(B) is an enlarged cross-sectional view taken along line BB of FIG. 4.

6 (a) is an enlarged cross-sectional view taken along line CC of FIG.
FIG. 6B is an enlarged cross-sectional view taken along the line DD of FIG.

FIG. 7 is a partial perspective view showing a state in which a grip portion is formed on the outer periphery of the insert portion.

FIG. 8 is a partial sectional view of the same.

9 (a) is an enlarged sectional view taken along line EE of FIG.
FIG. 9B is an enlarged sectional view taken along line FF of FIG. 8.

10 (a) is an enlarged cross-sectional view taken along line GG of FIG.
FIG. 9B is an enlarged sectional view taken along line HH of FIG. 8.

FIG. 11 is a perspective view showing another example of the base.

FIG. 12 is a partial cross-sectional view of a handle using this mouthpiece.

FIG. 13 is a partial perspective view showing a conventional handle.

14A is an enlarged sectional view taken along line I-I of FIG. 13, and FIG. 14B is an enlarged sectional view taken along line JJ of FIG.

[Explanation of symbols]

1 core, 2 blade, 3 step part, 6 step part, 9 spacer, 10 groove, 12 side plate part, 17 support part, 18
Clasp, 19 insert part, 20 gripping part, 20a
Filling part, 20b Connection shaft part, F molding space.

Claims (1)

[Claims] 1. A spacer (9) made of a polymer material is formed with a groove (10) between both side plate portions (12), and a core (1) extending from a blade (2) is formed in the groove (10). 10) is fitted to form an insert portion (19), and a mouthpiece (18) is inserted around the outer periphery of the insert portion (19) so as to be outside the side plate portions (12) of the spacer (9). The formed support portion (17) supports the base (18), and a molding space (F) is formed between the inner surface of the base (18) and the outer peripheral surface of the spacer (9).
The handle of the cutting tool, characterized in that a gripping part (20) is formed by molding a polymer material into the outer periphery of the insert part (19) and the molding space (F) in the die (18).