KR101856782B1 - Grip for driver and method for manufacturing the same - Google Patents

Abstract

The object of the present invention is to provide a grip for a driver which can easily grip the grip body and can transfer rotational torque efficiently to the core when the rotation torque is applied to the grip body and a method of manufacturing the grip. A rigid core 2 formed to be long and fixed to the fringe 11 of the tool 1 and an elastic grip body 3 formed in a cylindrical shape and fixed to the outer periphery of the core 2 The grip body 3 has a grip outer layer 31 forming an outer peripheral portion and an elastic layer 34 disposed inside the grip outer layer 31 and capable of grasping the grip outer layer 31 , The core (2) has a protrusion (22, 23) protruding in a direction perpendicular to the longitudinal direction and arranged along the longitudinal direction, wherein the protrusion (22, 23) is perpendicular to the longitudinal direction The distal ends 22a and 23a are extended so as to be exposed.

Description

Technical Field [0001] The present invention relates to a grip for a driver,

The present invention relates to a manually operated driver grip and a method of manufacturing the same.

Grips of a tool having a rigid core formed to be long and fixed to a fringe portion of a tool and an elastic grip body formed in a cylindrical shape and fixed to the outer periphery of the core are known as grips of conventional tools For example, Patent Document 1). According to the grip of the tool, since the elastic layer is formed on the inner side of the grip outer layer in the grip body, it is possible to grasp the grip outer layer and to grasp easily.

Japanese Patent Application Publication No. 2009-520609

However, in the grip of the tool according to Patent Document 1, since the elastic layer is disposed between the outer layer of the grip and the core, when the rotational torque is applied to the grip body, the elastic layer is deformed in the circumferential direction. Therefore, a relative displacement in the circumferential direction between the outer layer of the grip and the core is largely generated, and the rotational torque can not be efficiently transmitted to the core.

Further, in the method of manufacturing a grip of a tool according to Patent Document 1, a welded portion is formed in order to form the resin by joining together the resins in the mold, and as a result, the mechanical strength is lowered (tends to be a starting point, , There is a problem that the appearance of the design is damaged by the weld line formed at the welded portion. The term " welded portion " refers to a portion where resins are joined together in a mold during resin molding, and " weld line " means that the resin is hardened before completely fused with each other in the welded portion , And a line-shaped mark formed in a V-groove shape between the resin and the inner surface of the metal mold.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a driver grip capable of efficiently transmitting a rotational torque to a core when grip torque is applied to the grip body in addition to easy gripping of the grip body .

Further, in view of the above circumstances, the present invention is not only easy to grasp the grip main body, but also allows the rotational torque to be efficiently transmitted to the core when the rotational torque is applied to the grip main body, And to provide a method for manufacturing a grip for a driver.

The driver grip according to the present invention has a rigid core formed to be long and fixed to a fringe portion of a tool and an elastic grip body formed in a cylindrical shape and fixed to the outer periphery of the core, And an elastic layer disposed on the inside of the grip outer layer to enable grip deformation of the grip outer layer. The core includes a core body formed in a cylindrical shape, And one projecting portion protrudes in a direction opposite to a direction in which the other projecting portion protrudes from the core body, and each projecting portion has a length In such a manner that the distal end portion is extended to divide the grip main body into two portions in a direction orthogonal to the longitudinal direction, The elastic layer is characterized by being arranged in an arc shape along the circumferential direction so that the force applied to the grip body in the radially inward direction acts toward the protruding portion and each end portion is extended so as to face the protruding portion.

According to the driver grip according to the present invention, the projecting portion is extended so that the tip end portion is exposed in a direction perpendicular to the longitudinal direction. This prevents the relative displacement between the outer grip layer and the core in the circumferential direction from occurring when the elastic layer is deformed in the peripheral direction when the rotation torque is applied to the grip body because the protrusion is connected to the grip outer layer .

In addition, since the projecting portion is extended so that the tip end portion is exposed in the direction perpendicular to the longitudinal direction, the projecting portion is extended to the outside of at least part of the elastic layer and the grip outer layer. Therefore, a force acting on the grip outer layer or the elastic layer along the circumferential direction can reliably be received at the protruding portion.

Further, according to the driver grip according to the present invention, since the pair of protrusions with which the tip end is exposed is provided, the grip main body can be divided into two parts. Thereby, the forces applied to the respective portions of the grip body can be reliably received at the corresponding protruding portions.

Further, according to the driver grip according to the present invention, since the elastic layer is disposed along the circumferential direction, when the grip body is gripped, the elastic layer is compressively deformed. Therefore, in the grip body, Force is applied. When a rotational torque is applied to the grip body, the force along the circumferential direction is also received by the protrusion, so that the rotational torque applied to the core can be further increased.

Further, in the driver grip according to the present invention, each of the projections may be tapered toward the tip end.

Further, in the driver grip according to the present invention, the elastic layer may have an elastic portion having a lower hardness than the grip outer layer, and a deformation promoting portion for promoting deformation of the elastic portion in the circumferential direction when the grip body is gripped.

According to the driver grip having such a configuration, when the grip body is grasped, that is, in the direction orthogonal to the longitudinal direction and when a force is applied toward the core (toward the inside), the deformation promoting portion has elasticity To deform the part in the circumferential direction. Therefore, when the grip body is gripped, a force along the circumferential direction tends to be applied to the grip body.

Further, in the driver grip according to the present invention, the projecting portion may have a wide portion that is wide in the circumferential direction at a predetermined position in the longitudinal direction.

According to the driver grip having such a configuration, the wide portion having a wide width in the circumferential direction is formed at a predetermined position in the longitudinal direction. As a result, the width in the circumferential direction of the grip body at a predetermined position in the longitudinal direction is smaller than the other positions, so that the amount of deformation of the grip body is reduced. Therefore, in the driver, when the screw is to be started to be turned (to start tightening), the screw is turned quickly, so that by operating the position where the deformation of the grip body is small, it is possible to cope with a fast spiral turning operation.

In the method of manufacturing a driver grip according to the present invention, the driver grip is the driver grip, and the grip main body includes an inner grip layer forming an inner peripheral portion and a crosslinking portion connecting the grip outer layer and the grip inner layer, A method for manufacturing a driver grip which is disposed between an inner layer and a grip outer layer and a crosslinking portion, the method comprising the steps of: arranging a core in a mold cavity so that the protrusion contacts the inner surface of the mold cavity; A step of intermittently injecting the first resin into the mold cavity through the injection port formed at the same number as the number of the projections to form the outer layer and the cross-linking portion; and a step of forming at least a part of the elastic layer between the inner layer of the grip, , A step of injecting a second resin, which is tighter than the first resin, into the mold cavity from the injection port while the injection of the first resin is stopped .

According to the method for manufacturing a driver grip according to the present invention, the core is disposed in the mold cavity of the mold, then the first resin is injected from the injection port into the mold cavity intermittently, The second resin is injected while the injection of the first resin is stopped. As a result, the first resin is brought into contact with the inner surface of the mold cavity, the inner layer of the grip, the outer layer of the grip and the crosslinking portion are formed by the first resin, and the second resin is disposed in the first resin. At least a part of the elastic layer is formed between the grip inner layer and the grip outer layer and the bridging portion.

Further, in a state in which the protruding portion is in contact with the inner surface of the mold cavity of the mold, each resin is injected into the mold cavity through the injection port formed in the same number as the number of the protruding portions. As a result, it is possible to prevent the welded portion from being generated in the grip body (the weld line is generated in the grip outer layer), so that the mechanical strength of the grip body (grip outer layer) can be increased.

Specifically, in the case where a plurality of protrusions are formed, a plurality of spaces (the same number as the protrusions) partitioned by protrusions of the core are formed in the mold cavity, and each resin from one injection port Lt; / RTI > The first resin injected from each injection port is expanded (expanded) into a balloon shape by the later injected resin. However, by the protrusions contacting the inner surface of the mold cavity, the first resin injected from each injection port It is possible to prevent the occurrence of the welded portion because the resins do not join together.

Further, when one protrusion is formed, one space is formed in the mold cavity, and each resin is injected from one injection port into the one space. The first resin injected first from the injection port is expanded (expanded) into a balloon shape by the later injected resin, but the first resin injected from the injection port by the protruding portion, which is in contact with the inner surface of the mold cavity, It is possible to prevent the occurrence of the welded portion.

In the method of manufacturing a driver grip according to the present invention, the driver grip is the driver grip, and the grip main body includes an inner grip layer forming an inner peripheral portion and a crosslinking portion connecting the grip outer layer and the grip inner layer, A method for manufacturing a driver grip which is disposed between an inner layer and an outer layer of a grip and a crosslinking portion, the method comprising the steps of: disposing a core in a mold cavity so that the protrusion contacts the inner surface of the mold cavity; The step of continuously injecting the first resin into the mold cavity through the injection port formed at the same number as the number of the projections to form the crosslinked part and the step of forming at least a part of the elastic layer between the inner grip layer and the outer- , And a step of injecting a second resin, which is tighter than the first resin, in the mold cavity from the injection port while the first resin is continuously injected .

According to the method for manufacturing the driver grip according to the present invention, the core is disposed in the mold cavity of the mold, and then the first resin is continuously injected from the injection port into the mold cavity, The second resin is injected while the first resin is continuously injected. As a result, the first resin is brought into contact with the inner surface of the mold cavity, the inner layer of the grip, the outer layer of the grip and the crosslinking portion are formed by the first resin, and the second resin is disposed in the first resin. At least a part of the elastic layer is formed between the grip inner layer and the grip outer layer and the bridging portion.

Further, in a state in which the protruding portion is in contact with the inner surface of the mold cavity of the mold, each resin is injected into the mold cavity through the injection port formed in the same number as the number of the protruding portions. As a result, it is possible to prevent the welded portion from being generated in the grip body (the weld line is generated in the grip outer layer), so that the mechanical strength of the grip body (grip outer layer) can be increased.

As described above, according to the driver grip according to the present invention, it is easy to grasp the grip main body, and when the rotation torque is applied to the grip main body, the rotation torque can be efficiently transmitted to the core .

Further, according to the method for manufacturing a driver grip according to the present invention, not only is it easy to grasp the grip body, but also when the rotational torque is applied to the grip body, the rotational torque can be efficiently transmitted to the core, And exhibits an excellent effect that the mechanical strength can be increased.

Fig. 1 is an overall view of a driver grip according to an embodiment of the present invention. Fig. 1 (a) is a perspective view (front view, plan view and right side view, (b) is a perspective view (rear view, bottom view, and left side view, and the same is applied hereinafter) as seen from the other side.
Fig. 2 is an overall view of the grip according to the embodiment of Fig. 1, Fig. 2 (a) is a front view, and Fig. 2 (b) is a rear view.
Fig. 3 is an overall view of the grip according to the embodiment of Fig. 1, wherein Fig. 3 (a) is a plan view and Fig. 3 (b) is a bottom view.
Fig. 4 is an overall view of the grip according to the embodiment of Fig. 1, wherein Fig. 4 (a) is a right side view and Fig. 4 (b) is a left side view.
Fig. 5 is an overall view of the grip according to the embodiment of Fig. 1, Fig. 5 (a) is a cross-sectional view taken along the line AA of Fig. 2, and Fig. Respectively.
Fig. 6 is an overall view of the grip according to the embodiment of Fig. 1, Fig. 6 (a) is a cross-sectional view taken along line CC of Fig. 3, and Fig.
Fig. 7 is a view for explaining the action of the grip according to the embodiment of Fig. 1, and Figs. 7 (a) and 7 (b) show cross-sectional views taken along the direction orthogonal to the longitudinal direction.
Fig. 8 is a view for explaining a method of manufacturing the grip according to the embodiment of Fig. 1, wherein Fig. 8 (a) is a cross-sectional view taken along the longitudinal direction, and Fig. 8 (b) Respectively.
9 (A) is a sectional view taken along the longitudinal direction, and Fig. 9 (B) is an enlarged sectional view taken along the line EE of Fig. 9 Respectively.
Fig. 10 is an overall view of a grip according to another embodiment of the present invention. Fig. 10 (a) is a perspective view from one side, and Fig. 10 (b) is a perspective view from the other side.
11 is an overall view of the grip according to the embodiment of Fig. 10, wherein Fig. 11 (a) is a front view and Fig. 11 (b) is a rear view.
Fig. 12 is an overall view of the grip according to the embodiment of Fig. 10, wherein Fig. 12 (a) is a plan view and Fig. 12 (b) is a bottom view.
Fig. 13 is an overall view of the grip according to the embodiment of Fig. 10, wherein Fig. 13 (a) is a right side view and Fig. 13 (b) is a left side view.
Fig. 14 is an overall view of the grip according to the embodiment of Fig. 10, Fig. 14 (a) is a cross-sectional view taken along line FF of Fig. 11, and Fig. 14 (b) is a cross- Respectively.
Fig. 15 is an overall view of a grip according to another embodiment of the present invention, wherein Fig. 15 (a) is a perspective view from one side and Fig. 15 (b) is a perspective view from the other side.
FIG. 16 is an overall view of the grip according to the embodiment of FIG. 15, wherein FIG. 16 (a) is a front view and FIG. 16 (b) is a rear view.
17 is an overall view of the grip according to the embodiment of Fig. 15, wherein Fig. 17 (a) is a plan view and Fig. 17 (b) is a bottom view.
18 is an overall view of the grip according to the embodiment of Fig. 15, wherein Fig. 18 (a) is a right side view and Fig. 18 (b) is a left side view.
Fig. 19 is an overall view of the grip according to the embodiment of Fig. 15, Fig. 19 (a) is a cross-sectional view taken along the line HH in Fig. 16, Respectively.
Fig. 20 is an overall view of a grip according to another embodiment of the present invention. Fig. 20 (a) is a perspective view from one side, and Fig. 20 (b) is a perspective view from the other side.
FIG. 21 is an overall view of the grip according to the embodiment of FIG. 20, wherein FIG. 21 (a) is a front view and FIG. 21 (b) is a rear view.
FIG. 22 is an overall view of the grip according to the embodiment of FIG. 20, wherein FIG. 22 (a) is a plan view and FIG. 22 (b) is a bottom view.
Fig. 23 is an overall view of the grip according to the embodiment of Fig. 20, wherein Fig. 23 (a) is a right side view and Fig. 23 (b) is a left side view.
Fig. 24 is an overall view of the grip according to the embodiment of Fig. 20, Fig. 24 (a) is a cross-sectional view taken along a line KK in Fig. 21, Respectively.
Fig. 25 is an overall view of a grip according to another embodiment of the present invention. Fig. 25 (a) is a perspective view from one side, and Fig. 25 (b) is a perspective view from the other side.
Fig. 26 is an overall view of a grip according to still another embodiment of the present invention, and shows a cross-sectional view cut in a direction orthogonal to the longitudinal direction.

Hereinafter, one embodiment of the driver grip according to the present invention will be described with reference to Figs. 1 to 9. Fig.

As shown in Figs. 1 to 6, the driver according to the present embodiment includes a rigid construction tool (tool) 1 formed into a long rod shape (cylindrical shape) And a stiff core 2 fixed to one end of the stitch portion 11 in the longitudinal direction thereof. The driver further includes a resilient grip body 3 formed in a cylindrical shape and fixed to the outer periphery of the core 2.

The tool construction (1) has a screw fitting portion (12) fitted in a groove formed in the head of the screw, at the other end portion in the longitudinal direction. Further, in the present embodiment, the screw fitting portion 12 is formed in a cross shape so as to fit into a cross-shaped groove formed in the head of the screw. The coplanar construction 1 is provided with a large diameter engaging portion 111 on the fringe portion 11 for engaging the core 2 in order to prevent the core 2 from slipping out. And the hollow structure 1 is formed of a metal.

The core 2 has a tubular core body 21 fitted to the fringe 11 of the hollow construction 1 and a cylindrical core body 21 projecting in the direction perpendicular to the longitudinal direction from the core body 21, And protruding portions 22 and 23 protruding toward the center. In the present embodiment, a pair of projections 22 and 23 are formed. The core 2 is formed of a hard synthetic resin.

The core body 21 is formed such that the end portions 211 and 212 in the longitudinal direction are larger in diameter than the middle portion 213. The core body 21 is provided with a recessed portion 214 to be caught by the retaining portion 111 of the hollow shell 1 inserted in the inner peripheral portion. The other end portion 212 is formed in a tapered shape toward the front end. On the surface of the other end 212, recesses 212a and 212b are formed.

(Hereinafter also referred to as " second projecting portion ") 23 of the other projecting portion (hereinafter also referred to as " first projecting portion " And protrudes from the core body 21 in the direction indicated by the arrow. The projections 22 and 23 are arranged along the longitudinal direction of the core 2 (core body 21). Specifically, each of the projections 22 (23) extends along the longitudinal direction so as to extend from one end 211 of the core body 21 to the other end 212 thereof.

The protrusions 22 and 23 are extended so as to expose the tip portions 22a and 23a in the direction orthogonal to the longitudinal direction of the core 2, that is, in the radial direction of the core 2. The grip body 3 is divided into the plurality of portions 3a and 3b by the plurality of protrusions 22 and 23 formed. The protrusions 22 and 23 are formed so as to be tapered toward the distal ends 22a and 23a in a direction perpendicular to the longitudinal direction of the core 2.

The first projection 22 has a protruding body 221 arranged along the longitudinal direction of the core 2. The first projecting portion 22 has a wider portion 222 on the other side in the longitudinal direction of the core 2 (the projecting portion main body 221) and wider in the circumferential direction than the projecting portion main body 211.

The wide portion 222 is formed gradually wider from one end to the middle portion in the longitudinal direction of the core 2 (protruding body 221), and narrows gradually from the middle portion toward the other end Respectively. More specifically, the wide portion 222 is formed in an elliptical shape as viewed from the front. The wider portion 222 is disposed in correspondence with the position where the palm is in contact with the end portion 211 on one side of the core 2 and is operated to be screwed with a plurality of fingers (a plurality of fingertips touch).

Each of the portions 3a and 3b of the grip body 3 includes a grip outer layer 31 forming an outer circumferential portion, an inner grip layer 32 forming an inner circumferential portion, a grip outer layer 31 and an inner grip layer 32 And bridging parts (33, 33) for connection. Each of the portions 3a and 3b of the grip body 3 is disposed on the inside of the grip outer layer 31 and on the outside of the grip inner layer 32, that is, between the grip outer layer 31 and the grip inner layer 32 And an elastic layer 34 is provided to enable the grip outer layer 31 to be gripped and deformed.

Each grip outer layer 31 is disposed along the circumferential direction. Specifically, each grip outer layer 31 is formed in an arc shape in a cross section cut in a direction orthogonal to the longitudinal direction of the grip body 3, and at each end 31a in the circumferential direction, (22a, 23a) of the pair of arms (22, 23).

Each of the grip outer layers 31 is elastically deformed together with the elastic layer 34 when the grip body 3 is gripped and pressed so that the thickness (width dimension in the radial direction) is smaller than the thickness of the elastic layer 34 Respectively. Each grip outer layer 31 is formed in a concavo-convex shape on its surface (outer surface) so that a rotational torque can be easily applied when the grip body 3 is gripped.

Each grip inner layer 32 is disposed along the circumferential direction. Specifically, each grip inner layer 32 is formed in an arc shape in a cross section cut in a direction orthogonal to the longitudinal direction of the grip body 3, and at the respective end portions 32a in the circumferential direction, (22b, 23b) of the base plates (22, 23). Each of the grip inner layers 32 is formed so that the thickness (width dimension in the radial direction) is thinner than the thickness of the elastic layer 34. [

Each of the bridging portions 33 is disposed along the radial direction of the grip body 3 so as to connect the circumferential end portion 31a of the grip outer layer 31 and the circumferential end portion 32a of the grip inner layer 32 have. Each of the bridging portions 33 is connected from the distal end portions 22a and 23a of the protruding portions 22 and 23 to the base end portions 22b and 23b.

Each of the elastic layers 34 has elastic portions 341, ..., which are lower in hardness than the grip outer layer 31. Each of the elastic layers 34 is deformed in the circumferential direction when the grip body 3 is gripped in the middle portion in the longitudinal direction of the grip body 3, (342, ...) for accelerating the deformation.

Each of the elastic layers 34 is disposed between the grip outer layer 31 and the grip inner layer 32 and between the bridging portions 33 and 33. Each of the elastic layers 34 is arranged along the circumferential direction. Specifically, each of the elastic layers 34 is formed in an arc shape in a cross section cut in a direction orthogonal to the longitudinal direction of the grip body 3. Each of the elastic layers 34 is formed so that each end portion 34a in the circumferential direction extends toward each of the projecting portions 22 and 23.

The plurality of elastic portions 341, ... are arranged in the circumferential direction in the middle portion in the longitudinal direction of the grip body 3. Each of the elastic portions 341 is made of a resin having elasticity, which is lower in hardness than the grip outer layer 31.

Each of the deformation promoting portions 342 is formed continuously with the end portion in the circumferential direction of each elastic portion 341 so that the middle portion 342a in the radial direction is bent so as to protrude toward the protruding portions 22, Respectively. More specifically, each of the deformation promoting portions 342 is formed so that the middle portion 342a is larger than each of the radial end portions 342b in the cross section cut in the direction orthogonal to the longitudinal direction of the grip body 3, And is arranged so as to protrude toward the end portion 34a (or the projecting portions 22, 23) of the elastic layer 34. [

Each of the grip outer layers 31, each of the grip inner layers 32 and each of the bridging portions 33 has a hardness higher than that of the elastic portion 341 of the elastic layer 34 and lower than that of the core 2, As shown in Fig. Each of the grip outer layers 31, each of the grip inner layers 32 and each of the bridging portions 33 is formed of the same resin as the deformation promoting portion 342 of the elastic layer 34 in this embodiment.

The configuration of the grip according to the present embodiment is as described above. Next, the operation of the grip according to the present embodiment will be described with reference to Fig. In Fig. 7, hatching (parallel diagonal lines) of the cut surfaces is omitted.

As shown in Fig. 7 (a), when the grip body 3 is gripped, the force (gripping force) P1 in the radially inward direction is applied to the grip body 3. A force P11 approaching each of the end portions 342b and 342b is applied to each of the deformation promoting portions 342 of the elastic layer 34 so that the elastic portions 341 of the elastic layer 34 are compressed in the circumferential direction . As a result, forces P12 and P13 along the direction in which the elastic layer 34 is disposed, that is, along the circumferential direction are applied to the grip body 3.

As shown in Fig. 7 (b), when the grip body 3 is rotated while being gripped, a circumferential force (rotation torque) P2 is applied to the grip outer layer 31. Since the protruding portion 23 and the grip outer layer 31 are connected to each other, the rotary torque P2 can be received by the protruding portion 23, and consequently the rotary torque P2 can be surely transmitted to the core 2. In addition, since the force P12 along the circumferential direction generated by the gripping force P1 is also received by the protruding portion 23, the rotational torque P12 + P2 applied to the core 2 can be further increased.

The operation of the grip according to the present embodiment is as described above. Next, a method of manufacturing the grip according to the present embodiment will be described with reference to Figs. 8 and 9. Fig.

First, as shown in Figs. 8 and 9, a grip manufacturing apparatus 8 for manufacturing a grip will be described. The grip manufacturing apparatus 8 is provided with a pair of dies 81 and 81 having die cavities 811 formed therein. The grip manufacturing apparatus 8 is provided with injection means for injecting two types of resins 3c and 3d into the mold 81 through injection ports 812 formed in the respective molds 81 ) ≪ / RTI >

Each of the molds 81 has contact portions 813 and 813 protruding inward so as to come into contact with the projecting portions 22 and 23 of the core 2 when the core 2 is placed and held in the mold cavity 811 . The pair of molds 81 hold the core 2 by holding end portions 211 and 212 in the longitudinal direction of the core body 21 and hold the end portion 212 of the core body 21 The recesses 212a and 212b position the core 2 in the circumferential direction.

The injection ports 812 and 812 are formed in the same number as the projections 22 and 23 (two in this embodiment). Each injection port 812 is disposed between the contact portions 813 and 813 in the circumferential direction (width direction) of each metal mold 81. Specifically, each injection port 812 is disposed at the center of both the width direction and the longitudinal direction of each metal mold 81.

The injection means 82 has a mixed color forming nozzle (not shown) 821 connected to the injection port 812 of the mold 81. The injection means 82 injects the first resin 3c as the base material from the mixed color forming nozzle 821 and injects the second resin 3d flowing in a separate system into the first resin 3c .

As shown in Fig. 8, in order to manufacture the grip by the grip manufacturing apparatus 8, the grip 81 is fixed to the pattern portion 11 of the tool construction 1 in the mold cavity 811 of the mold 81 The core 2 is disposed. Since the tip ends 22a and 23a of the protrusions 22 and 23 contact the inner surfaces of the mold cavity 811, that is, the contact portions 813 and 813, the protrusions 22 and 23 are formed in the mold cavity 811 Two spaces of the same number are formed, and one injection port 812 is disposed for one of the divided spaces.

Then, the first resin 3c is injected into the mold 81 by a predetermined amount. Thereafter, the injection of the first resin 3c is intermittently performed, and the second resin 3d is injected into the mold 81 only when the injection of the first resin 3c is stopped.

As described above, the first resin 3c and the second resin 3d are alternately injected so that the first resin 3c that has entered the mold cavity 811 from each injection port 812 expands into a balloon shape, 2 and flows in both circumferential directions around the core 2. Further, the second resin 3d is introduced into the first resin 3c expanded in the balloon shape, and the second resin 3d is also inflated into the balloon shape.

9, the first resin 3c injected for the first time is brought into close contact with the mold cavity 811 and the core 2 to form the grip outer layer 31, the grip inner layer 32, and the cross- 33, and 33 are formed. The first resin 3c firstly injected from the one injection port 812 and the first resin 3c injected from the other injection port 812 are separated from each other by the protrusions 22 and 23, The first resin 3c injected from the first resin 3c is not joined. Therefore, the welded portion (weld line in the grip outer layer 31) is not formed in the grip body 3.

A part of the elastic layer 34, that is, each elastic part 341 of the elastic layer 34 is formed by the second resin 3d and the first resin 3c injected after the second resin 3d The deformation promoting portion 342 of the elastic layer 34 is formed. That is, the injection of the first resin 3c and the injection of the second resin 3d are sequentially performed, and the first resin 3c injected while the second resin 3d is injected causes the respective strain promoting portions 342 .

The portions 3a and 3b of the grip main body 3 are formed by covering the second resin 3d with the first resin 3c and covering the first resin 3c with the second resin 3d By repeating this, it is composed of a plurality of layers.

The first resin 3c is a relatively hard resin and is made of a thermoplastic elastomer capable of injection molding, for example, an elastomer or rubber rich in repellency such as an olefin type or styrene type. Is preferably 60 to 80. The second resin 3d is a comparatively soft resin, and the same resin as the elastomer can be used. It is preferable that the second resin 3d is 10 to 30 in JIS-A hardness.

As described above, according to the grip according to the present embodiment, the protruding portions 22 (23) are extended so that the distal end portions 22a (23a) are exposed in the direction orthogonal to the longitudinal direction. Thus, even if the elastic layer 34 is deformed in the circumferential direction when the rotation torque P2 is applied to the grip body 3, since the projections 22 and 23 are connected to the grip outer layer 31, It is possible to suppress the occurrence of relative displacement in the circumferential direction between the outer layer 31 and the core 2.

The elastic layer 34 disposed inside the grip outer layer 31 allows the grip outer layer 31 to be gripped and deformed so that the grip body 3 can be easily grasped, The rotation torque P2 can be efficiently transmitted to the core 2 when P2 is applied.

In addition, since the projections 22 and 23 are extended so that the distal ends 22a and 23a are exposed in the direction orthogonal to the longitudinal direction, the projections 22 and 23 are formed on the elastic layer 34 and the grip outer layer 31 As shown in Fig. Therefore, it is possible to reliably receive the force acting on the grip outer layer 31 or the elastic layer 34 along the circumferential direction at the protruding portions 22 and 23.

Since the grip according to the present embodiment has a plurality of protrusions 22 and 23 in which the distal ends 22a and 23a are exposed, the grip body 3 is divided into the plurality of portions 3a and 3b can do. As a result, the forces applied to the respective portions (3a, 3b) of the grip body 3 can be reliably received by the corresponding protruding portions (22, 23).

According to the grip according to the present embodiment, since the elastic layer 34 is disposed along the circumferential direction, when the grip body 3 is gripped (when the gripping force P1 is applied to the grip body 3) The forces P12 and P13 along the direction in which the elastic layer 34 is disposed, that is, along the circumferential direction are applied to the grip body 3. When the rotation torque P2 is applied to the grip main body 3, the force P12 (P13) along the circumferential direction is received at the projections 23 and 22 so that the rotational torque P12 (P13) applied to the core 2 + P2) can be increased.

According to the grip according to the present embodiment, the first protruding portion 22 is formed with the wide portion 222, which is wide in the circumferential direction, at the other position in the longitudinal direction of the core 2. Thus, at this position in the longitudinal direction, the width in the circumferential direction of the grip body 3 is smaller than the other positions, so that the amount of deformation of the grip body 3 is reduced. Therefore, in the driver, when the screw starts to be turned (to start tightening), it is desired to rotate the screw quickly, so that by operating such a position where the deformation of the grip body 3 is small, it is possible to cope with a fast spiral turning operation.

According to the grip according to the present embodiment, in the state where the projections 22 and 23 are in contact with the inner surface of the mold cavity 811 of each of the molds 81, the number of projections 22 and 23, And the resins 3c and 3d are injected into the mold cavity 811 from the molds 812 and 812, respectively. As a result, it is possible to prevent the welded portion from being generated in the grip body 3, so that the mechanical strength of the grip body 3 can be increased and the weld line can be prevented from being generated in the grip outer layer 31, It is possible to prevent the appearance of the chair from being damaged.

It should be noted that the driver grip according to the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. It goes without saying that the constitution and the method according to the various modifications described below may be arbitrarily selected and employed in the constitution and the method according to the above embodiment.

In the driver grip according to the above embodiment, the structure in which the hollow section 1 and the core 2 are separate members has been described, but the present invention is not limited to such a structure. For example, the hollow structure and the core may be integrally formed (formed of the same material).

In the driver grip according to the above embodiment, the projections 22 and 23 are arranged in the longitudinal direction of the core 2. However, the present invention is not limited to this configuration. For example, the projections may be arranged at a position where the elastic layer 34 is formed in a predetermined length in the longitudinal direction, specifically, in the longitudinal direction.

In the driver grip according to the above embodiment, the wide portion 222 is disposed on the other side in the longitudinal direction of the core 2 (the projecting portion body 221). However, Do not. For example, the wide portion 222 may be arranged on one side in the longitudinal direction of the core 2 (protruding body 221), and as shown in Figs. 10 to 14, the core 2 (The protruding portion main body 221) in the longitudinal direction.

In the driver grip according to the above-described embodiment, the wide portion 222 is formed in an elliptical shape. However, the present invention is not limited to this configuration. For example, the wide portion 222 may have a polygonal shape, specifically, a diamond shape, a hexagonal shape, or a rectangular shape as shown in Figs. 15 to 19, Or may be formed to be long along the longitudinal direction as shown in Fig.

In the driver grip according to the above embodiment, the wide portion 222 is formed on one projecting portion 22. However, the present invention is not limited to this configuration. For example, the wide portion may not be formed, the plurality of projections may be formed separately, or a plurality of projections may be formed on one projected portion.

In the driver grip according to the above-described embodiment, in order to reduce the amount of deformation in the circumferential direction of the grip body 3, the wider portion 222 having a larger width in the circumferential direction is provided in the longitudinal direction of the core 2 But the present invention is not limited to this configuration. For example, as shown in Fig. 25, in addition to the projections 22 and 23 arranged in the longitudinal direction, the protrusions 24 and 24 arranged only at a predetermined position (the other position in the longitudinal direction of the core 2) ... so that the amount of deformation in the circumferential direction of the grip body 3 at such a predetermined position may be reduced.

In the driver grip according to the above embodiment, the grip body 3 includes the grip outer layer 31, the grip inner layer 32, the bridging portions 33 and 33, and the elastic layer 34 However, the present invention is not limited to such a configuration. For example, the grip body 3 may be configured such that the bridging portions 33 and 33 are not formed, and as shown in Fig. 26, the grip inner layer 32 and the bridging portions 33 and 33 are formed But it may be constituted by only the grip outer layer 31 and the elastic layer 34. [

In the driver grip according to the embodiment, the elastic layer 34 includes the deformation promoting portions 342, ..., but the present invention is not limited to this configuration. For example, the elastic layer 34 may be composed of only the elastic portion 341 as shown in Fig.

In the driver grip according to the above embodiment, the injection of the first resin 3c is intermittently performed, and the second resin 3d is injected while the injection of the first resin 3c is stopped The present invention is not limited to such a method. For example, the injection of the first resin 3c may be continuously performed, and only the second resin 3d may be injected intermittently. Alternatively, the grip body 3 may be formed separately, and then the grip body 3 may be fixed (adhered) to the core 2. Alternatively,

In the driver grip according to the present invention, the one end portion 342b of the deformation promoting portion 342 is connected to the grip outer layer 31 and the other end portion 342b of the deformation promoting portion 342 is connected to the grip inner layer 32 So that the deformation promoting portion 342 functions as a bridge portion connecting the grip outer layer 31 and the grip inner layer 32. [

1: Tooling (tool)
2: Core
3: grip body
3a: part of the grip body
3b: part of the grip body
11:
22: (first) protrusion
22a:
23: (second) protrusion
23a:
31: outer grip layer
34: elastic layer
81: Mold
222: wide portion
341:
342:
811: Mold joint
812:

Claims (6)

A rigid core which is elongatedly formed and fixed to the fringe portion of the tool, and an elastic grip body which is formed in a cylindrical shape and fixed to the outer periphery of the core,
The grip body includes a grip outer layer forming an outer peripheral portion and an elastic layer disposed inside the grip outer layer and capable of grasping the grip outer layer,
Wherein the core is a driver grip having a core body formed in a cylindrical shape and having a pair of protrusions protruding from the core body in a direction perpendicular to the longitudinal direction and disposed along the longitudinal direction,
One projecting portion is projected in a direction opposite to a direction in which the other projecting portion projects from the core body,
Each protrusion is formed so as to extend in a direction orthogonal to the longitudinal direction so that the distal end portion is exposed so as to divide the grip body into two portions,
Characterized in that the elastic layer is arranged in an arc shape along the circumferential direction so that a force radially inwardly applied to the grip body acts toward the protruding portion and each end portion is extended so as to face the protruding portion. The driver grip according to claim 1, wherein each projection is formed to be tapered toward the tip end.  The driver grip as claimed in claim 1 or 2, wherein the elastic layer has an elastic portion having a lower hardness than the grip outer layer and a deformation promoting portion for promoting deformation of the elastic portion in the circumferential direction when the grip body is gripped.  The driver grip as claimed in claim 1 or 2, wherein the projection has a wide portion in a circumferential direction at a predetermined position in the longitudinal direction. The grip for a driver according to any one of claims 1 to 3, wherein the grip body includes an inner grip layer forming an inner peripheral portion, and a cross link portion connecting the outer grip layer and the inner grip layer, wherein the elastic layer comprises a grip inner layer, A method for manufacturing a driver grip,
A step of disposing the core in the mold cavity so that the protrusion contacts the inner surface of the mold cavity of the mold;
A step of intermittently injecting the first resin into the mold cavity through the injection port formed at the same number as the number of the projections to form the grip inner layer, the grip outer layer, and the cross-
And a step of injecting a second resin, which is tighter than the first resin, from the injection port into the mold cavity while the injection of the first resin is stopped, in order to form at least a part of the elastic layer between the inner grip layer and the grip outer layer and the cross- Wherein the method comprises the steps of: The grip for a driver according to any one of claims 1 to 3, wherein the grip body includes an inner grip layer forming an inner peripheral portion, and a cross link portion connecting the outer grip layer and the inner grip layer, wherein the elastic layer comprises a grip inner layer, A method for manufacturing a driver grip,
A step of disposing the core in the mold cavity so that the protrusion contacts the inner surface of the mold cavity of the mold;
Continuously injecting the first resin into the mold cavity through the injection port formed in the same number as the number of the projections, in order to form the inner grip layer, the grip outer layer, and the cross-
And a step of injecting a second resin, which is tighter than the first resin, from the injection port into the mold cavity during the continuous injection of the first resin so as to form at least a part of the elastic layer between the inner grip layer and the grip outer layer and the cross- Of the grip portion.

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