JP4149505B1 - Tool grip and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably transmit a force applied to an outer grip layer to an inner grip layer while maintaining elasticity by an elastic layer.
A grip inner layer 2 forming an inner peripheral cylinder, a grip outer layer 3 forming a grip outer peripheral surface, and a grip elastic deformation of the grip outer layer 3 are arranged between the grip inner layer 2 and the grip outer layer 3. And an elastic layer 4 that enables it. A main cross-linking portion 5 and a sub-cross-linking portion 6 that connect the grip inner layer 2 and the grip outer layer 3 are formed at intervals in the grip circumferential direction, and the elastic layer 4 is formed between the cross-linking portions 5 and 6. The sub-crosslinking portion 6 is formed in a substantially circular arc shape in which a midway portion 6b is displaced in the grip circumferential direction from both end portions 6a connected to the grip inner layer 2 and the grip outer layer 3.
[Selection] Figure 1

Description

  The present invention relates to a grip for a driver and other manually operated tools, and a manufacturing method thereof.

Conventionally, a grip such as a driver is disposed between the grip inner layer forming the inner peripheral cylinder, the grip outer layer forming the grip outer peripheral surface, and the grip inner layer and the grip outer layer so that the grip outer layer can be gripped and elastically deformed. (For example, refer to Patent Document 1).
Japanese Utility Model Publication No. 52-164660

  In the prior art, since the elastic layer is disposed between the grip inner layer and the grip outer layer, the grip outer layer can be gripped elastically deformed and is easy to grip, but when applying a strong rotational torque, The elastic layer is greatly deformed in the grip circumferential direction, and the relative movement in the circumferential direction between the grip inner layer and the grip outer layer is greatly generated, and the torque is hardly transmitted. Also, when pressing the tool with the grip applied in the grip longitudinal direction (tool axis direction), the elastic layer is greatly deformed in the grip longitudinal direction, the grip outer layer moves greatly relative to the grip inner layer, and torque is transmitted. It will be difficult.

It is an object of the present invention to provide a grip for a tool and a method for manufacturing the same, which can solve the problems of the prior art.
The present invention forms a main cross-linking portion and a sub-cross-linking portion that connect the grip inner layer and the grip outer layer, and forms the sub-cross-linking portion in a substantially arc shape in cross section, thereby maintaining the elasticity by the elastic layer. An object of the present invention is to provide a grip for a tool capable of reliably transmitting a force applied to an outer layer to the inner layer of the grip.
In the present invention, the first resin is intermittently or continuously injected from the injection port, and the second resin softer than the first resin is intermittently injected from the injection port, whereby the grip inner layer and the grip outer layer are formed. It is an object of the present invention to provide a method of manufacturing a grip for a tool that can form a main cross-linking portion and a sub-cross-linking portion to be joined and an elastic layer therebetween.

Specific means for solving the problems in the present invention are as follows.
First, the grip is disposed between the grip inner layer forming the inner peripheral cylinder, the grip outer layer forming the grip outer peripheral surface, and the grip inner layer and the grip outer layer, and enables grip elastic deformation of the grip outer layer. In the grip of tools having an elastic layer,
A main cross-linking portion and a sub-cross-linking portion connecting the grip inner layer and the grip outer layer are formed at intervals in the grip circumferential direction, and the elastic layer is formed between the respective cross-linking portions,
The sub-bridging portion is formed in a substantially arc-shaped cross section in which a middle portion is displaced in the grip circumferential direction from both ends connected to the grip inner layer and the grip outer layer , and the middle portion is thicker than the both ends. Formed,
The sub-crosslinked portions are arranged with the main cross-linked portion interposed therebetween, and each sub-crosslinked portion has a convex arc facing the main cross-linked portion .

Secondly, in the grip circumferential direction, a plurality of main bridge portions are arranged at positions that equally divide the grip circumferential direction, and an even number of sub-bridge portions are arranged between the main bridge portions. The sub-crosslinking portion is formed in a substantially arc shape in cross section that is recessed with respect to the center between the main cross-linking portions.
Thirdly, the grip is characterized in that each of the plurality of main cross-linking portions is formed along the grip longitudinal direction, and the sub-cross-linking portion is formed in a ring shape between the main cross-linking portions in a side view of the grip. To do.

Fourthly, the grip is characterized in that the sub-bridging portion having a substantially arc-shaped cross section has a substantially crescent shape with a thicker middle portion than both ends.
The manufacturing method of a grip is a tool that firstly arranges a core in a mold forming mold cavity of a mold and injects two kinds of resins, a first resin and a second resin, into the mold cavity from an injection port. In the manufacturing method of the grip,
The first resin is intermittently injected to form a grip inner layer and a grip outer layer on the inner surface of the mold cavity, and a main bridge portion connecting the grip inner layer and the grip outer layer is formed. The second resin that is softer than one resin is injected to form an elastic layer between the grip inner layer, the grip outer layer, and the main cross-linking portion, and at least one first injection is performed after the second resin forming the elastic layer is injected. Resin injection and second resin injection are sequentially performed, and a sub-crosslinking portion that connects the grip inner layer and the grip outer layer with the first resin is formed between the injections of the second resin.

Secondly, the grip manufacturing method is a tool in which a core is disposed in a mold mold cavity of a mold, and two types of resins, a first resin and a second resin, are injected into the mold cavity from an injection port. In the manufacturing method of the grip,
The first resin is continuously injected to form a grip inner layer and a grip outer layer on the inner surface of the mold cavity, and a main cross-linking portion connecting the grip inner layer and the grip outer layer is formed, and the first resin is continuously injected. In the meantime, the second resin softer than the first resin is injected once to form an elastic layer between the grip inner layer, the grip outer layer, and the main bridge portion, and the second resin forming the elastic layer is intermittently injected. Then, when the second resin is cut off, a sub-crosslinking portion that connects the grip inner layer and the grip outer layer is formed by the continuous injection of the first resin.
[Action]
The grip 1 is disposed between the grip inner layer 2 and the grip outer layer 3, and has an elastic layer 4 that allows the grip outer layer 3 to be gripped and elastically deformed, and the main bridge that connects the grip inner layer 2 and the grip outer layer 3. The portion 5 and the sub-crosslinking portion 6 are formed at an interval in the grip circumferential direction. When a torque is applied by gripping the grip outer layer 3, the torque is applied to the grip inner layer via the main cross-linking portion 5 and the sub-crosslinking portion 6. Even if the elastic layer 4 is elastically deformed, torque can be reliably transmitted without causing excessive circumferential relative movement between the grip inner layer 2 and the grip outer layer 3. Even when the grip is pushed in the grip longitudinal direction, the amount of displacement of the grip outer layer 3 relative to the grip inner layer 2 can be suppressed, and the pressing force can be reliably transmitted to the grip inner layer 2.

In addition, since the sub-crosslinking portion 6 is formed in a substantially arc shape in cross section in which the midway portion 6b is displaced in the grip circumferential direction from both end portions 6a connected to the grip inner layer 2 and the grip outer layer 3, this sub-crosslinking portion. 6 is also elastically deformed in the grip radial direction and the circumferential direction, and the necessary force can be transmitted while maintaining the desired elasticity as the grip 1.
When a plurality of main bridge portions 5 are arranged at positions that equally divide the grip circumferential direction, and even number of sub-bridge portions 6 are arranged between the main bridge portions 5, force transmission by the main bridge portions 5 is performed in a plurality of grip circumferential directions. If the even-numbered sub-bridging portion 6 has a substantially arc-shaped cross section that is recessed with respect to the center between the main bridging portions 5, Regardless of whether the rotation direction of the grip 1 is forward or reverse, force transmission is possible while elastically deforming in the grip radial direction and circumferential direction.

When a plurality of main cross-linking portions 5 are formed along the grip longitudinal direction and the sub-cross-linking portions 6 are formed in a ring shape between the main cross-linking portions 5 in a side view of the grip, the sub-cross-linking portions 6 are formed in the length of the grip. Force transmission is also possible while elastically deforming in the grip circumferential direction and longitudinal direction in a wide range of directions.
The sub-crosslinking portion 6 is elastically deformed so that the thin end portions 6a approach each other around the midway portion 6b when the midway portion 6b is thicker than the both end portions 6a. The intermediate portion 6b having a large deformation resistance is deformed after the deformation of the both end portions 6a, and the grip inner layer 2 and the grip outer layer 3 are integrated when the most force is applied. Force can be transmitted in the state.

The grip 1 has an outer surface that is immersive and deformed by the pressure of the fingers, increasing the contact area, reducing the pain and fatigue of the fingers, making it easier to grasp and less slippery with the fingers, and rotating torque or pressing force to grip It is possible to efficiently transmit from the outer layer 3 to the handle portion 9 of the tools, and the force transmission efficiency can be increased.
In the manufacturing method of the grip 1, when the first resin is intermittently injected from the injection port 13 into the grip forming mold cavity 11, the first injected portion of the first resin is the inner surface of the mold cavity 11. To form a grip inner layer 2 and a grip outer layer 3, and a tip portion flowing in both directions in the circumferential direction of the grip forms a main bridge portion 5, and then the second resin injected is the grip inner layer 2 and the grip A first elastic layer 4 that adheres to the outer layer 3 and faces the main bridge portion 5 in the grip circumferential direction and is elastically deformable is formed.

When the second resin is intermittently injected, the first resin forms a wall that partitions the second resin before and after the second resin, that is, the sub-crosslinking portion 6. Since the portion 6 is made of the same material as the grip inner layer 2 and the grip outer layer 3, both end portions 6 a are formed in a state of being connected to the grip inner layer 2 and the grip outer layer 3.
Since the resin flows in the grip forming mold cavity 11 so that the balloon swells from the injection port 13, both the elastic layer 4 and the sub-crosslinking part 6 are formed in a substantially circular arc shape with the injection port 13 as the center. Since 6 is derived from the first resin, both end portions 6a thereof are pulled by the grip inner layer 2 and the grip outer layer 3, and the midway portion 6b is large and flows so as to have an arc shape and a substantially crescent shape. Since the second resin also receives flow resistance with the first resin, both end portions 6a are thin and the middle portion 6b is substantially crescent shaped.

  The first resin and the second resin injected from the injection port 13 into the mold cavity 11 have a plurality of ring shapes centering on the injection port 13 when the grip 1 is viewed from the outside. That is, the first resin injected from the two injection ports 13 collides in the middle of the two injection ports 13 to become the main bridge portion 5 along the grip longitudinal direction, and the elastic layer 4 and the sub-bridge portion 6 are circular or oval. It is formed in a ring shape.

  According to the present invention, the force applied to the outer grip layer can be reliably transmitted to the inner grip layer while maintaining the elasticity of the elastic layer.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of the present invention. The grip 1 is arranged so as to surround an outer periphery of a core 12 fitted to a handle portion 9 of a tool such as a driver. The grip inner layer 2 forming the inner cylinder to be fitted, the grip outer layer 3 forming the grip outer periphery, and the grip elasticity of the grip outer layer 3 disposed between the grip inner layer 2 and the grip outer layer 3 And an elastic layer 4 that enables deformation, and has a three-layer structure in which the elastic layer 4 is sandwiched between two layers.

The elastic layer 4 is formed of a soft synthetic resin that is softer and more flexible than the inner grip layer 2 and the outer grip layer 3, and the inner grip layer 2 and the outer grip layer 3 are harder than the elastic layer 4 but lower in hardness than the core 12. It is made of resin and is thinner than the elastic layer 4, and in particular, the grip outer layer 3 is backed up by the elastic layer 4 so as to be elastically deformable.
Both ends 1a and 1b in the longitudinal direction of the grip 1 are made of the same resin material as the grip inner layer 2 and the grip outer layer 3, and are integrally formed at the same time when they are formed.
Between the grip inner layer 2 and the grip outer layer 3, a main cross-linking portion 5 and a sub-cross-linking portion 6 are formed so as to connect them, and the main cross-linking portion 5 and the sub-cross-linking portion 6 are in the grip circumferential direction. The elastic layer 4 is also formed between the respective bridging portions.

The sub-bridging portion 6 is formed in a substantially circular arc shape in which a midway portion 6b is displaced in the grip circumferential direction from both end portions 6a connected to the grip inner layer 2 and the grip outer layer 3.
In FIG. 1, a plurality of main bridge portions 5 (two displaced by 180 degrees) are arranged in the grip 1 in the grip circumferential direction of the cross section of the grip, and the grip circumferential direction is equally divided. An even number (two in total, four in total) of the sub-bridging portions 6 are arranged, and the sub-bridging portions 6 between the main bridging portions 5 have a substantially arc-shaped cross section that is recessed with respect to the center between the main bridging portions 5. Is formed. The elastic layer 4 between the main cross-linked portion 5 and the sub-cross-linked portion 6 and between the sub-cross-linked portions 6 is also formed in a substantially circular arc shape that is recessed with respect to the center between the main cross-linked portions 5.

That is, a total of two sets of sub-bridging portions 6A and 6B are arranged in a pair of left and right so as to sandwich one main bridging portion 5, and each group of sub-bridging portions 6 has a convex arc as a main bridging portion 5. The middle part 6b is thicker than the both end parts 6a, and has a substantially crescent shape. The surface 5a of the main bridge part 5 facing the sub-bridge part 6 also has a substantially arcuate cross section.
In addition, two sets of elastic layers 4A and 4B are arranged in a pair of left and right so as to sandwich one main bridge portion 5, and each set of elastic layers 4 has a convex arc facing the main bridge portion 5 In addition, the middle part is thicker than the both end parts, and has a substantially crescent shape.

The elastic layer 4 and the sub-crosslinked portion 6 are a first elastic layer 4A, a first sub-crosslinked portion 6A, a second elastic layer 4B, and a second sub-crosslinked portion 6B from the side close to the main cross-linked portion 5, A third elastic layer 4C is formed at the center between the main cross-linking portions 5, and each of the first and second elastic layers 4A and 4B and the sub-cross-linking portions 6A and 6B has a substantially crescent shape.
As for the thickness of each part, the thickness in the circumferential direction of the main bridge portion 5 is the thickest, the grip outer layer 3 is next thick, the grip inner layer 2 is the thinnest, and the grip outer layer 3 extends from the main bridge portion 5 to the main bridge portion. 5, the elastic layer 4 and the sub-crosslinked portion 6 between the main cross-linked portion 5 and the sub-cross-linked portion 6 are formed to have substantially the same thickness in the circumferential direction. ing.

The grip 1 is formed in the grip longitudinal direction, the main bridge portion 5 is formed along the longitudinal direction, and the sub-bridge portion 6 is connected to the grip inner layer 2 and the grip outer layer 3 as shown in FIG. The grip diameter direction midway portion 6b is formed in a substantially circular arc shape with a cross section displaced in the longitudinal direction.
The sub-bridging portion 6 is formed in a substantially arc shape in cross section that is recessed with respect to the center in the grip longitudinal direction in the grip longitudinal direction (longitudinal sectional view), and the middle portion 6b is thicker than the both ends 6a. It is. In addition, the surface 1c which opposes the subbridge part 6 of the longitudinal direction both ends 1a and 1b of the grip 1 is also a cross-sectional arc shape.

The grip side view shape of the elastic layer 4 and the sub-bridge portion 6 of the grip 1 is formed in a ring shape between the main bridge portions 5 as shown in FIG. This is because when two types of resin are injected into the mold space of the mold from one injection port 13 at the time of injection molding of the grip 1, the resin expands in a circle around the injection port 13. The elastic layer 4C has a circular outer periphery, the second sub-crosslinking portion 6B closest to the injection port 13 is formed in an oval shape, and the first sub-crosslinking portion 6A and the second elastic layer 4B are formed in an oval shape. The ring shape is centered on the inlet 13.
That is, the first and second sub-crosslinking portions 6A and 6B, the second elastic layer 4B, etc. are substantially crescents regardless of the cross section of the ring, and the thickness of the middle part of the crescents continuously changes in thickness. is doing.

The sub-bridging portion 6 has such a ring shape, so that when the torque in the grip circumferential direction is applied or when the pressing force in the grip longitudinal direction is applied, the force of the sub-bridging portion 6 is increased by those forces. The ring shape is deformed, the deformation resistance exerts a spring effect, and the force can be transmitted from the grip outer layer 3 to the grip inner layer 2 while maintaining elasticity.
On the outer peripheral surface of the grip outer layer 3, an uneven surface is formed that prevents slipping in the grip circumferential direction and the longitudinal direction between the grip and the hand.
In FIG. 1, when the grip 1 configured as described above is gripped by applying a gripping force P1, the elastic layer 4 is pressed and deformed so that the sub-crosslinking portion 6 also has the forces T1 and T2. The crescent shape is deformed so that both end portions 6a approach each other, and the elastic restoring force of the elastic layer 4 and the elastic restoring force due to the substantially crescent shape of the sub-crosslinking portion 6 harder than the elastic layer 4 Due to the elastic restoring force, the grip 1 fits the palm, lowers the surface pressure, and increases the frictional resistance with the palm.

When the grip 1 is rotated and the torque P2 is applied by turning, the main bridge portion 5 transmits the torque P2 to the grip inner layer 2, but the auxiliary bridge portion 6 also has a force in the grip circumferential direction. On this side, the substantially crescent shape is further deformed so that both end portions 6a approach the grip circumferential direction and the radial direction, and a pressing force T3 along the substantially crescent shape is generated, and the torque P2 is applied by pushing the grip inner layer 2. introduce.
When the torque P2 is applied in the vicinity of the elastic layer 4C, the auxiliary cross-linking portions 6A and 6B are located closer to the main cross-linking portion 5 and are located at positions where the torque P2 can be easily transmitted, and assist torque transmission more efficiently.

Further, the main cross-linking portion 5 and the sub-cross-linking portion 6 on the side opposite to the direction in which the torque P2 is applied receive the tensile force T4, but the resistance force against the tensile force T4 of the sub-crosslinking portion 6 is also torque transmission to the grip inner layer 2, Substantial torque transmission is supported.
[Experimental example]
FIG. 5 shows the result of the twist test of the driver grip.
A grip A indicated by a solid line is a grip 1 having first and second sub-crosslinking portions 6A and 6B between two main bridge portions 5 shown in the above embodiment, and a grip B indicated by a dotted line is two grips B. A grip having the main cross-linking portion 5 but not having the sub-cross-linking portion, and a grip C indicated by a one-dot chain line is a grip having only one main cross-linking portion 5.

In the test, the tool handle 9 is fixed, the grip is gripped and rotated, and the torque corresponding to the rotation angle of the grip is measured.
The grip A always has a larger torque corresponding to the rotation angle than the grips B and C. At a rotation angle of 60 degrees, the grip A is 8N. m or more, while grips B and C each have a torque of 6 N.m. m, 5N. Only torque of m or less can be obtained. Moreover, a constant torque, for example, 4N. In order to obtain m, the grip A may be rotated approximately 17 degrees, but the grips B and C must be rotated 20 degrees and 24 degrees or more, respectively.

As is clear from this test result, the elastic outer layer 4 is provided to allow elastic deformation of the outer grip layer 3 and the first and second sub-crosslinking portions 6A and 6B are provided between the two main bridging portions 5. When torque is applied to the grip 1, there is little movement of the grip outer layer 3 with respect to the grip inner layer 2, and torque can be reliably transmitted from the grip outer layer 3 to the grip inner layer 2.
[Production method]
Next, a manufacturing method of the grip having the above-described configuration will be described.
FIG. 2 is a longitudinal cross-sectional view taken along the mold dividing surface. In FIG. 2, 10U and 10D are upper and lower halves, and a grip forming mold cavity 11 is formed therein. The core 12 fitted to the tool handle 9 such as a driver is disposed in the mold cavity 11 and two types of resin are injected from the injection port 13 to form the grip 1.

The injection holes 13 (shown in phantom lines in FIG. 3) communicating with the mold cavity 11 are formed on the left and right mold dividing surfaces of the upper and lower split molds 10U and 10D one by one. The second resin is intermittently injected with a delay from the injection of the first resin.
The first resin is a relatively hard resin that forms the grip inner layer 2, the grip outer layer 3, the main cross-linking portion 5, and the sub-crosslinking portion 6, and is a thermoplastic elastomer that can be injection-molded, such as olefin-based or styrene-based It is formed of an elastomer or rubber having a high resilience, and a JIS-A hardness of 55 ° ± 15 ° is preferable.

The second resin is a relatively soft resin that forms the elastic layer 4, and the same resin as the elastomer can be used, and the JIS-A hardness is preferably 10 ° ± 5 °.
A color mixing molding nozzle (not shown) is connected to the injection port 13, and a first resin as a basic material is injected from the color mixing molding nozzle, and a second resin that has flowed through another system into the first resin. Eject.
The injection amounts of the first resin and the second resin may be the same or different, and are appropriately determined depending on the grip 1 and the applied tool, the required elasticity, and the like.

Since the first resin forms the grip inner layer 2, the grip outer layer 3, and the grip longitudinal direction both ends 1a and 1b, a predetermined amount is injected before the second resin. The first resin is injected intermittently, and the second resin is injected only when the first resin is disconnected.
When the first resin and the second resin are alternately injected in this way, first, the first resin that has entered the mold cavity 11 from each inlet 13 swells in a balloon shape, collides with the core 12 and collides with the core 12. The second resin flows into the balloon-shaped first resin and the second resin swells into a balloon shape, and the outermost first resin forms the mold. The grip inner layer 2 and the grip outer layer 3 are formed in close contact with the inner surface of the cavity 11 (including the outer peripheral surface of the core 12), and flows toward the back of the mold cavity 11. The first resins injected into 11 are bonded to each other in the middle to form two main bridge portions 5 along the grip longitudinal direction at positions displaced by 180 degrees.

The second resin injected at the time of the first first resin injection cut is swollen by the second first resin injected thereafter, and the inner elasticity of the grip inner layer 2, the grip outer layer 3 and the two main bridge portions 5 are inflated. A layer 4A is formed, and a sub-crosslinking portion 6A that connects the grip inner layer 2 and the grip outer layer 3 is formed inside the elastic layer 4A by the second first resin.
By injecting the elastic layer 4 and the sub-crosslinking portion 6 twice to form the elastic layers 4A and 4B and the sub-crosslinking portions 6A and 6B, and then injecting the second resin, it is elastic in the center in the longitudinal direction of the grip. The layer 4C is formed, and then the first resin is injected to form the grip outer layer 3 that covers the elastic layer 4 so as not to be exposed.

In addition, the grip can be formed by continuously injecting the first resin and intermittently injecting only the second resin.
That is, when the first resin continuously entering the mold cavity 11 from each inlet 13 swells in a balloon shape and the second resin intermittently enters the balloon-shaped first resin, the first resin enters the balloon shape. The outermost first resin swells closely to the inner surface of the mold cavity 11 to form the grip inner layer 2 and the grip outer layer 3, and the first resins from the two inlets 13 are bonded to each other at the back of the mold cavity 11. The two main cross-linking portions 5 are formed, and during the molding of the grip inner layer 2, the grip outer layer 3 and the main cross-linking portion 5, the second resin forms the elastic layer 4A on the inside thereof, and the second resin is injected. At the time of disconnection, the sub-crosslinked portion 6A is formed by the first resin inside the elastic layer 4A. Similarly, the second elastic layer 4B, the sub-crosslinking portion 6B, and the third elastic layer 4C are formed.

In the present invention, the shape of each member and the positional relationship between the front, rear, left, and right in the embodiment are best configured as shown in FIGS. However, it is not limited to the said embodiment, A material, a member, a structure, etc. can be variously deformed and a combination can also be changed.
For example, only one injection port 13 of the mold 10 is formed and only one main cross-linking portion 5 is formed, or three or more injection ports 13 are formed at equal intervals in the grip circumferential direction. Then, three or more main cross-linking portions 5 may be formed, and the injection ports 13 of the mold 10 may be formed at a plurality of locations at intervals in the grip longitudinal direction.

Further, in the grip circumferential direction, the sub-crosslinking portions 6 are formed in a total of four in pairs of two, but only one set or three or more sets may be formed, and the flow direction of the second resin may be changed. You may make it control and arrange | position the 1 or several subbridge part 6 only to the one main bridge | crosslinking part 5 side from the injection port 13. FIG.
Furthermore, the thickness of the elastic layer 4 and the sub-crosslinking portion 6 may be different, or the thickness of the grip inner layer 2 may be made thicker than the grip outer layer 3. When the thickness of the grip inner layer 2 is made thicker than that of the grip outer layer 3, only the grip 1 may be molded by the mold 10 and fitted to the core 12 after molding.

Furthermore, a plurality of pins penetrating the mold cavity 11 and reaching the core 12 in the mold 10 are scattered in the grip circumferential direction and the longitudinal direction, and the first resin injected into the mold cavity 11 is the pin. It may be formed by adding a thin cylindrical pillar-shaped sub-bridging portion 6 that connects the grip inner layer 2 and the grip outer layer 3 together.
In addition, an uneven surface that prevents displacement movement in the grip circumferential direction and the longitudinal direction between the core 12 and the inner peripheral surface of the grip inner layer 2 may be formed.

It is a cross-sectional view of a grip showing an embodiment of the present invention. It is a longitudinal cross-sectional view of a grip. It is a partial cross section side view of the grip showing the side view shape of a subbridge part. It is a side view of a grip. It is a graph which shows the twist test of the grip for drivers.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grip 2 Grip inner layer 3 Grip outer layer 4 Elastic layer 5 Main bridge | crosslinking part 6 Subbridge part 6a End part 6b Midway part 9 Tool handle part 10 Die 11 Type | mold cavity 12 Core 13 Inlet

Claims (6)

A tool having a grip inner layer forming an inner peripheral cylinder, a grip outer layer forming a grip outer peripheral surface, and an elastic layer arranged between the grip inner layer and the grip outer layer and capable of gripping elastic deformation of the grip outer layer. In the kind of grip,
A main cross-linking portion and a sub-cross-linking portion connecting the grip inner layer and the grip outer layer are formed at intervals in the grip circumferential direction, and the elastic layer is formed between the respective cross-linking portions,
The sub-bridging portion is formed in a substantially arc-shaped cross section in which a middle portion is displaced in the grip circumferential direction from both ends connected to the grip inner layer and the grip outer layer , and the middle portion is thicker than the both ends. Formed,
A grip for a tool, characterized in that the sub-crosslinking portions are arranged with the main cross-linking portion interposed therebetween, and each sub-crosslinking portion has a convex arc facing the main cross-linking portion .   In the grip circumferential direction, a plurality of the main bridges are arranged at positions equally dividing the grip circumferential direction, an even number of sub-bridges are arranged between the main bridges, and the sub-bridges between the main bridges are the main bridges. 2. The grip for a tool according to claim 1, wherein the grip is formed in a substantially arc shape in cross section that is recessed with respect to the center between the parts.   The plurality of main cross-linking portions are respectively formed along the grip longitudinal direction, and the sub-cross-linking portions are formed in a ring shape between the main cross-linking portions in a grip side view. Grip for tools.   The tool grip according to any one of claims 1 to 3, wherein the sub-crosslinking portion having a substantially arc-shaped cross section has a substantially crescent shape with a thicker middle portion than both ends. In a method of manufacturing a grip for a tool, in which a core is arranged in a mold cavity for grip molding of a mold and two kinds of resins, a first resin and a second resin, are injected into the mold cavity from an injection port.
The first resin is intermittently injected to form a grip inner layer and a grip outer layer on the inner surface of the mold cavity, and a main bridge portion connecting the grip inner layer and the grip outer layer is formed. The second resin that is softer than one resin is injected to form an elastic layer between the grip inner layer, the grip outer layer, and the main cross-linking portion, and at least one first injection is performed after the second resin forming the elastic layer is injected. An injection of a resin and an injection of a second resin are sequentially performed, and a sub-crosslinking portion that connects the grip inner layer and the grip outer layer with the first resin is formed between the injections of the second resin. Production method. In a method of manufacturing a grip for a tool, in which a core is arranged in a mold cavity for grip molding of a mold and two kinds of resins, a first resin and a second resin, are injected into the mold cavity from an injection port.
The first resin is continuously injected to form a grip inner layer and a grip outer layer on the inner surface of the mold cavity, and a main cross-linking portion connecting the grip inner layer and the grip outer layer is formed, and the first resin is continuously injected. In the meantime, the second resin softer than the first resin is injected once to form an elastic layer between the grip inner layer, the grip outer layer, and the main bridge portion, and the second resin forming the elastic layer is intermittently injected. A method for manufacturing a grip for a tool, comprising: forming a sub-crosslinking portion that connects the grip inner layer and the grip outer layer with the continuous injection of the first resin when the second resin is cut off.

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