WO2008001552A1

WO2008001552A1 - Grip for tool or the like and method of producing the same

Info

Publication number: WO2008001552A1
Application number: PCT/JP2007/059752
Authority: WO
Inventors: Yasuaki Taguchi; Jiro Taguchi
Original assignee: Vessel Industrial Co., Ltd.
Priority date: 2006-06-28
Filing date: 2007-05-11
Publication date: 2008-01-03
Also published as: EP2033744A4; CN101466505A; EP2033744A1; JPWO2008001552A1

Abstract

A grip for a tool or the like, which is easy to grip and which increases transmission efficiency of rotational torque from a hand and fingers to the tool or the like. The grip has a core (2) fitted to a handle of a tool, grip members (3) fitted to the outer periphery of the core (2) and each having a double layer structure having a grip inner layer (3A) and a grip outer layer (3B), and an elastic layer (4) placed between the grip inner layer (3A) and the grip outer layer (3B) and enabling deformation of the grip outer layer (3B) when the grip is gripped by a hand. At multiple positions in the circumferential and longitudinal directions of the grip, there are formed bridge sections (3C, 3D) integrally formed with the grip inner layers (3A) in a manner radially projecting from the grip inner layers (3A). The elastic layer (4) is formed between bridge sections, and a grip outer layer (3B) is formed between outer ends of the bridge sections.

Description

Specification

Tool grip and manufacturing method thereof

Technical field

[0001] The present invention relates to a grip for a driver or other manually operated tools, and a method for manufacturing the grip.

Background art

[0002] Conventionally, the grip portion of a driver has a handle portion coated with a hard grease, and a groove or an uneven portion for preventing slippage is formed on the outer surface, or a rubber layer or a foamed grease layer is provided. (For example, see Patent Document 1).

Patent Document 1: Japanese Patent Publication No. 8-501026

Disclosure of the invention

Problems to be solved by the invention

[0003] However, if the handle is covered with a hard resin, the surface will be slippery even if a strong rotational torque is to be applied, and the fingers will hurt quickly, which may hinder long working hours. there were. In addition, those provided with a rubber layer or foamed resin layer have the disadvantage that the torque in the rotational direction is used for compressing and deforming the resin and is not easily transmitted to the rotation of the shaft.

An object of the present invention is to provide a grip for a tool and a method for manufacturing the same that can increase the transmission efficiency of rotational torque that is easy to grip.

Means for solving the problem

[0004] In order to achieve the above object, the present invention has a double inner / outer structure having a core fitted to a handle portion of a tool and an outer periphery of the core fitted to the outer periphery of the core. In a grip of a tool having a grip member and an elastic layer that is interposed between the grip inner layer and the grip outer layer of the grip member and enables grip deformation of the grip outer layer, the grip is provided at a plurality of locations in the grip circumferential direction. The bridging portion is integrally formed so as to protrude from the grip inner layer, the elastic layer is formed between the bridging portions, and the grip outer layer is integrally formed between the outer ends of the bridging portions.

[0005] According to this configuration, the bridging portion can be deformed while enabling the grip outer layer to be gripped by the elastic layer. Thus, the rotational torque can be efficiently transmitted to the handle portion of the tools. Rotational torque is transmitted by direct transmission by the bridging part and secondary transmission transmitted from a state where the elastic layer is pressed against the bridging part and compressed and deformed.

The bridging part is a case where only those which are scattered in the longitudinal direction and the circumferential direction of the grip and a case where only those which are continuous in the longitudinal direction of the grip are mixed. In the case of! /, Even if it is a deviation! /.

[0006] In addition, the manufacturing method of the present invention includes a mold cavity for forming a grip for tools, a core space in which a core is disposed in the mold cavity, and two types of resin are injected into the mold cavity. The mold cavity outer surface force, and a plurality of pins are arranged toward the core space. Using a separable mold, the first resin is injected and injected from the inlet. While forming the grip inner layer and the grip outer layer on the core surface and the outer peripheral surface of the mold cavity, a bridging portion connecting the grip inner and outer layers is formed around the pin, and then the second resin is injected and injected from the inlet. Thus, an elastic layer is formed so as to surround the bridge portion between the inner and outer layers of the grip.

The invention's effect

[0007] According to the present invention, it is possible to obtain a grip of a tool that can improve the transmission efficiency of rotational torque from a finger that is easy to grip.

Brief Description of Drawings

FIG. 1 is a cross-sectional view of a first embodiment of a grip according to the present invention.

FIG. 2 is a longitudinal sectional view of the grip.

FIG. 3 is a perspective view of a grip.

FIG. 4 is a perspective view of an additional U grip.

FIG. 5 is a cross-sectional view of the second embodiment.

FIG. 6 is a cross-sectional view showing an example of a mold used for manufacturing a grip.

Explanation of symbols

[0009] S handle

1 grip 3 A Grip inner layer

3B grip outer layer

4 Elastic layer

5 Shellfish

8, 9 mold

10 pin

Type 11 cavity

12 Core space

13 Inlet

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show a first embodiment of the present invention. A grip 1 includes a core 2 that is fitted to a handle S of a tool, and the core 2 is surrounded around the outside of the core 2. The grip inner layer 3A and the grip outer layer 3B formed integrally with the grip inner layer 3A and the inner and outer dual grip members 3 and the grip inner layer 3A and the outer outer layer 3B of the grip member 3 are arranged. And an elastic layer 4 that enables the grip outer layer 3B to be gripped and deformed.

[0011] The grip inner layer 3A is formed in a plurality of locations in the grip circumferential direction so as to protrude outward in the radial direction, and the elastic layer 4 is formed between the cross-linked portions 3C. The grip outer layer 3B is formed between the outer ends of 3C.

As shown in FIG. 1, the bridging portion 3C illustrates a case where the elastic layer 4 is divided into a plurality of portions in the circumferential direction of the grip 1 between the grip inner layer 3A and the grip outer layer 3B. Figure 1 may be divided into two or more forces, for example, four, which is the case when divided into two.

In the grip member 3, the grip inner layer 3A, the grip outer layer 3B, and the bridging portion 3C are formed of a resin having a hardness higher than that of the elastic layer 4 but lower than that of the core 2, and a circumferential width of the bridging portion 3C. Is formed larger than the thickness of the grip inner layer 3A and the grip outer layer 3B.

[0012] The core 2 is made of a resin having a higher melting point and harder than the resin constituting the grip member 3. For example, polypropylene, nylon, ABS, etc. are used for the resin constituting the core 2. The

By forming the core 2 with a harder grease than the grip member 3, the rotational torque from the grip member 3 can be reliably transmitted from the core 2 to the handle portion S of the tools. Further, by configuring the core 2 with a high melting point resin, the grip member 3 can be formed by insert injection molding a low melting point resin around the core 2 than the core 2.

[0013] The grip member 3 is formed of a thermoplastic elastomer that can be injection-molded, for example, an elastomer or rubber that is rich in resilience, such as an olefin or styrene, and a styrene elastomer is particularly preferable. Good to use! ,.

The grip member 3 can be made of the same elastomer as the above-mentioned elastomer as the resin constituting the elastic layer 4 formed to have a JIS-A hardness of 55 ° ± 15 ° by the above-mentioned elastomer. JIS—A hardness is 10 ° ± 5 °. By doing so, the elastic layer 4 elastically supports the grip member 3 which is not easily deformed, and appropriate softness that does not cause the fingers to feel pain can be obtained. The elastic layer 4 can also be a gel-like resin.

As shown in FIG. 2, the grip member 3 and the elastic layer 4 are arranged over almost the entire length of the grip 1 of the tool. The grip member 3 is integrated into an annular groove 2 a formed on the outer peripheral surface of the core 2 so as not to be displaced in the longitudinal direction of the grip 1.

As shown in Fig. 1, the outer peripheral surface of the core 2 and the inner peripheral surface of the grip inner layer 3A are integrally rotated in the circumferential direction of the grip 1 by non-rotating engaging portions 2b and 3a made of radial irregularities. It is locked to do. In particular, the detent engagement portions 2b and 3a are formed between the bridging portion 3C and the core 2.

[0015] In addition, the slip prevention between the grip inner and outer layers 3A, 3B and the elastic layer 4 is achieved by fusing (adhering) the surfaces of the resin together by integral molding, and the wedge (anchor) effect by the interspersed bridging portions 3D The elastic layer 4 is pressed against the bridge portion 3C (wall) where the elastic layer 4 is continuously or intermittently arranged, and the elastic layer 4 is covered in a cellular shape by the bridge portions 3C and 3D between the inner and outer layers 3A and 3B of the dip. This is presumed to be performed by a combined action with the effect of limiting the movement of the elastic layer 4. The grip inner layer 3A and the elastic layer 4 are provided with radial concave and convex engaging portions 3b and 4a at a plurality of locations in the circumferential direction (see FIG. 1). The elastic layer 4 and the grip outer layer 3B are also formed with radial concave and convex engaging portions 4b and 3c at a plurality of locations in the circumferential direction (see FIG. 1). In addition, anti-slip recesses 3d are appropriately arranged on the outer surface of the outer outer layer 3B. An appropriate shape such as a groove or a recess is employed for the non-slip recess 3d.

As shown in FIG. 2, each of the bridging portions 3C, 3C is cut in the middle of the grip 1 in the longitudinal direction and is in an intermittent state, and an elastic layer 4 is disposed in the cut portion. That is, the bridging portions 3 C are arranged in a state dotted in both the circumferential direction and the longitudinal direction of the grip 1. The bridge portion 3C may be continuous in the longitudinal direction of the grip 1.

Between the bridge parts 3C and 3C, bridge parts 3D having a smaller volume than the bridge part 3C and scattered in the longitudinal direction and the circumferential direction of the grip 1 are provided. In this specification, the cross-linked portion 3C that is continuous or intermittent in the longitudinal direction of the grip 1 and has a large volume is referred to as a main cross-linked portion, and the cross-linked portion 3D that is dotted and has a volume smaller than that of the cross-linked portion 3C is a subsidiary. This is called a cross-linked part. However, the intermittent state is a state in which one directionality can be recognized in the dotted state.

[0017] The sub-crosslinking portion 3D is formed as a cylindrical column that extends from the grip inner layer 3A through the elastic layer 4 to reach the grip outer layer 3B. The through hole 5 in the cylindrical column is formed by the grip member 3 It is formed to open outward. As shown in FIG. 1, the sub-bridge portion 3D includes a first sub-bridge portion 3D1 in which the through-hole 5 (cylinder axis) is directed in the diameter direction, and the first sub-bridge portion 3D1 and the through-hole 5 are parallel to each other. And the second sub-crosslinking portion 3D2 is formed on both sides of the first sub-crosslinking portion 3D1 symmetrically (or asymmetrical). The second sub-crosslinking portion 3D2 may also be formed in the diameter direction (all the sub-crosslinking portions are formed radially).

[0018] The sub-bridge portion 3D is formed such that the thickness of the portion connected to the grip inner and outer layers 3A and 3B of the cylindrical bridge is increased, and the connection strength with the grip inner and outer layers 3A and 3B is secured.

The through hole 5 is a straight hole having a diameter of 1 to 2 mm or a tapered hole (a draft angle of the pin) that expands outward in the radial direction. The through-holes 5 are formed in the process of interspersing the bridging portions 3D. As an incidental effect of the through-holes 5, the grip 1 is prevented from slipping and the sub-crosslinking portion 3D is improved in the radial deformability. Is obtained. The through hole 5 may have a circular shape, a square shape, or other shapes. [0019] The position where the sub-bridge portion 3D is arranged can be coarsely and densely arranged in the longitudinal direction and the Z or circumferential direction of the grip 1, and is arranged at a dense pitch particularly in a portion where the transmission torque from the grip handshake is large. The parts having a small transmission torque are arranged at a rough pitch (for example, appropriately set within a range of 5 to 20 mm).

Fig. 3 shows the sub-bridge 3D intermittently arranged in multiple strips (three strips) along the length of the grip 1. In this case, the pitch of the sub-bridge 3D in each strip is small at the tip of the grip 1. The comb is enlarged on the rear end side. Such bridging portions 3D are formed symmetrically at two locations in the circumferential direction of the grip.

[0020] FIG. 4 shows two sub-crosslinking portions 3D, which are arranged in an approximately X shape. In this case, the intermittently arranged pitch of the sub-crosslinking portions 3D is reduced on the front end side of the grip 1, and the rear It is enlarged on the end side. Such sub-bridges 3D are symmetrically formed at two locations in the circumferential direction of the grip 1.

The intermittent arrangement shape of the sub-crosslinking portion 3D can be any other suitable shape such as a Y shape or a W shape. In this case, it is desirable that the arrangement density of the sub-crosslinking portions 3D is dense at a portion where the fingertip that is a main portion of torque transmission of the grip 1 comes into contact and rough on the hand side that is an auxiliary portion.

FIG. 5 shows a second embodiment, in which main bridge portions 3C that are intermittently (or continuous) in the grip longitudinal direction are formed at two locations in the grip circumferential direction, and between the main bridge portions 3C and 3C. Are formed with two second secondary cross-linking portions 3D2 having a through-hole 5 (cylinder axis) parallel to one diameter line between the main cross-linking portion 3C and the second sub-crosslinking portion 3D2. In addition, a rod-like protrusion 3E that protrudes from the grip outer layer 3B to the midway portion in the radial direction of the elastic layer 4 is formed between the two second sub-bridges 3D2 and 3D2. An outwardly open recess 5 ′ is formed in the rod-shaped protrusion 3E. That is, the grip outer layer 3B penetrates into the elastic layer 4 to form a bottomed cylindrical column.

[0022] In the grip 1 of the second embodiment, when the grip outer layer 3B and the elastic layer 4 are deformed radially inward by the compression force from the radially outer side, the second sub-crosslinking portions 3D2, 3D2 The tip end of the rod-like protrusion 3E in between is in contact with the outer surface of the grip inner layer 3A, and further elastic deformation of the grip outer layer 3B is suppressed or prevented. In addition to or instead of the second sub-crosslinking portion 3D2, the first sub-crosslinking portion 3D1 may be formed. Each embodiment of the present invention also has the above-described configuration force. According to the configuration shown in these embodiments, the outer surface is indented and deformed by the finger pressing force, and the contact area is increased. Rotating torque that is familiar to fingers and easy to grasp can be efficiently transmitted from the grip member 3 to the handle S of the tool.

[0023] In particular, in the present invention, the grip 1 is cushioned to reduce hand fatigue and increase rotational torque transmission efficiency. For example, when only reducing hand fatigue, the elastic layer 4 may be provided between the grip inner layer 3A and the grip outer layer 3B. However, in this case, when trying to transmit the rotational torque, most of the rotational torque generated on the grip is spent on the compression and deformation of the elastic layer 4 in the circumferential direction, and only the remaining torque passes through the core 2 and the handle S It will be transmitted to. In other words, the elastic layer 4 is sufficiently compressed and deformed in the circumferential direction of the grip, and torque is not transmitted to the core 2 unless it is force. Therefore, torque transmission loss increases.

Therefore, in the present invention, a bridging portion capable of reliably transmitting torque is provided, and the bridging portions are scattered and arranged at a dense pitch at a portion where the transmission torque needs to be increased, so that the transmission torque may be small. In other parts, the bridging portions are scattered at a rough pitch to reduce torque transmission loss and reduce hand fatigue. For this purpose, the dotted arrangement of the bridging portions is set in consideration of the balance between the function of improving the reduction of hand fatigue and the function of improving torque transmission.

FIG. 6 exemplifies a mold used in the manufacturing method of the grip 1, and a mold cavity 11 for forming the grip 1, a core space 12 for arranging the core 2 in the mold cavity 11, and The core 2 is arranged in the core space in the molds 8 and 9 having an injection port 13 for injecting two types of resin into the mold cavity 11 and can be divided into two in the vertical direction. These pins 10 are arranged in parallel to the direction perpendicular to the dividing surface 14 of the upper and lower molds 8 and 9 to enable die cutting. The arrangement and density of the pins 10 are set in accordance with the arrangement and density of the sub-bridge portion 3D and the through holes 5 described above.

[0025] In the manufacturing method of the present invention, the core 2 formed in a separate process in advance is placed in the core space 12 in the upper and lower molds 8 and 9, and positioned by the pin 10, and an integral molding method, for example, Molded by a sandwich molding method using a color mixing machine. In this sandwich molding method, the resin and elastic layer 4 constituting the grip member 3 are formed in the mold cavity 11 between the periphery of the core 2 installed in the upper and lower molds 8 and 9 and the inner surfaces of the molds 8 and 9. The resin to be configured is molded from the two nozzles of the color mixing machine through the same nozzle. First, a certain amount of the resin constituting the grip member 3 is injected, and then the resin constituting the elastic layer 4 Project a certain amount of. As a result, the resin constituting the grip member 3 previously injected is cured from the portion facing the molds 8 and 9 and is still heated in the center of the inner and outer layers of the mold cavities 11 of the molds 8 and 9. By filling the resin layer constituting the elastic layer 4 injected later into the fluidized state, the resin material constituting the grip member 3 is pushed onto the surface of the mold cavity 11 of the molds 8 and 9. The three-layered (sandwich) structure is filled with the resin that constitutes the elastic layer 4 inside.

That is, the previously injected resin flows while forming a solidified film on the inner wall surfaces of the molds 8 and 9 and the surface of the core 2 to flow inside and outside the grip inner layer 3A and the outer grip layer 3B. At the same time, it entangles with the pin 10 and forms a bridge 3D around it. Then, the resin injected later is cured by the internal and external surface force of the mold cavity 11 of the molds 8 and 9 as described above, and the internal and external layers 3A of the grip structure 3A, The elastic layer 4 is formed by filling the portion where 3B is formed. Thus, a sandwich structure is formed in which the elastic layer 4 is sandwiched between the grip inner layer 3A and the grip outer layer 3B of the grip member 3. At this time, the previously injected resin is diffused by each pin 10 and flows and fills every corner of the mold cavity 11, and adheres to the periphery of each pin 10 and solidifies, and the sub-crosslinking portion. 3D will be scattered. When a plurality of injection ports 13 are formed, a cross-linking portion (main cross-linking portion) 3C continuous in the longitudinal direction is formed at a location far from each of the injection ports 13. In addition, by forming a relief part of the resin in the mold where the main cross-linking part 3C is to be formed, the relief part injected by the succeedingly injected resin can be removed from the release part. An intermittent portion (interrupted portion of the main bridge portion) in which the elastic layer 4 is filled is formed. The elastic layer 4 fills the gap between the grip inner and outer layers 3A and 3B and between the main cross-linking portion 3C, the first sub-cross-linking portion 3D1, and the second sub-cross-linking portion 3D2 connecting them.

[0027] The present invention is not limited to these embodiments and may be implemented with appropriate modifications. For example, the main cross-linking portion 3C may be omitted and only the sub-cross-linking portion 3D may be used. The rear end portion may be applied to a ball end grip having a large diameter spherical shape. In addition, The lip member 3 and the elastic layer 4 may be molded by a molding method other than the sandwich molding method. In addition, the secondary cross-linking portion 3D is formed using a pin 10 and thus has a cylindrical column shape. May be.

Industrial applicability

The present invention may be applied to grips of other manually operated tools that are suitable for application to driver grips.

Claims

The scope of the claims

[1] A core that is fitted to the handle portion of the tool, a grip member having an inner / outer dual structure that is fitted to the outer periphery of the core and has a grip inner layer and a grip outer layer, and the grip of the grip member For a grip of a tool having an elastic layer that is interposed between the inner layer and the outer layer of the grip to enable grip deformation of the outer layer of the grip.

Cross-linking parts are integrally formed at multiple locations in the grip circumferential direction so as to protrude from the grip inner layer.

The elastic layer is formed between the cross-linked portions, and the grip outer layer is formed between the outer ends of the cross-linked portions.

A grip for a tool, wherein the grip member has a grip inner layer, a grip outer layer, and a bridging portion formed of a resin having a hardness higher than that of an elastic layer but lower than that of a core.

[2] The grip for a tool according to claim 1, wherein the bridging portions are scattered in a longitudinal direction and a circumferential direction of the grip.

[3] Interspersed positions of the bridging portions are formed in the grip in the longitudinal direction and in the Z or circumferential direction, the portions where the transmission torque from the grip handshake is large are densely arranged, and the portions where the transmission torque is small are rough. The tool grip according to claim 2, wherein the tool grip is disposed on the tool.

[4] The cross-linking portion is characterized in that there are a mixture of those scattered in the longitudinal direction and the circumferential direction of the grip and those that are continuous in the longitudinal direction of the grip. Grip for equipment described in 1.

[5] The tool grip according to any one of [1] to [4], wherein the bridging portion is formed with a through-hole extending to the grip inner layer inner surface force grip outer layer outer surface.

[6] The bridging portion has a circumferential width that is greater than the thickness of the grip inner layer and the grip outer layer at two locations in the circumferential direction and is continuous or intermittent in the longitudinal direction. The inner side force of the grip inner layer is scattered in the direction and has a sub-crosslinking portion having a through-hole reaching the outer surface of the grip outer layer, and this sub-cross-linking portion has a first sub-crosslinking portion having a through-hole oriented in the diametrical direction. The tool grip according to claim 1, further comprising: a second sub-crosslinking portion having a through-hole parallel to the through-hole of the first sub-crosslinking portion.

[7] Mold cavity for forming grips for tools, and core in which the core is placed Using a separable mold comprising a space and an injection port for injecting two types of resin into the mold cavity, and a plurality of pins are arranged from the outer surface of the mold cavity toward the core space, Injecting and injecting the first resin from the injection port to form a drip inner layer and a grip outer layer on the outer surface of the core and the mold cavity, forming a bridging portion that connects the grip inner and outer layers around the pin, Subsequently, a method of manufacturing a grip for a tool, comprising injecting and injecting a second resin from the injection port to form an elastic layer surrounding the bridging portion between the grip inner and outer layers.