JPH0611971U - driver - Google Patents

Abstract

(57) [Abstract] [Purpose] In a driver that can select the blade edge to be used by attaching the edge of the shank to the handle with the blade edge provided on both sides. Relaxes the moment and gains its life prolonging effect. [Structure] The shank 2 is formed separately from the handle 1, and different types of cutting edges 31 and 32 are formed at the front end and the rear end thereof, respectively. The handle 1 has a receiving portion 21 that detachably receives a part of the shank 2. The cutting edge receiving portion 3 is provided on the inner bottom portion of the receiving portion 21 and is formed of a material having a higher strength than the handle 1, and is engageable with and engaged with each of the cutting edges of the shank 2. It is intended to prevent the shank 2 from rotating in the axial direction with respect to the cutting edge.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a driver used for turning a screw or the like, and more particularly to an improvement in a driver that can reverse the front and rear of a shank.

[0002]

[Prior art]

 Conventionally, for example, as shown in FIG. 4, one side of a shank b having a plus blade edge b1 at one end and a minus blade edge b2 at the other end is used to receive a resin-molded handle a as shown in FIG. A driver to be inserted into a1 and used in the state shown in FIG. 6 was found. With such a screwdriver, depending on the type of screw head to be tightened, such as plus or minus, remove the shank b from the handle a and select the cutting edge to be inserted into the receiving part a1 so that the necessary cutting edge is exposed. It is something you can do. The cross section of at least the central portion of the shank b is formed in a substantially rectangular shape such as a square, and the inner edge portion a2 provided near the opening of the receiving portion a1 corresponds to the cross sectional shape of the shank b 1. It has a cross-sectional shape, that is, the same rectangular cross-sectional shape as the shank b. That is, when the screwdriver is rotated to tighten or loosen the screw, the inner edge portion a2 receives a moment generated by the shank b, so that the shank b does not rotate with respect to the handle a. Usually, in the driver whose shank can be replaced because the blade edge is selected, the above-mentioned inner edge portion a2 receives the moment from the shank in order to ensure the easy attachment / detachment.

[0003]

[Problems to be solved by the device]

 However, such an inner edge portion a2 is usually formed of plastic or the like, and is also formed of resin as a part of the handle a. In addition, due to the simplicity of manufacturing due to the progress of resin molding in recent years, the handle a is made of resin as described above, and it is cracked when a large moment is concentrated on the inner edge a2. Often occurred. The present invention is intended to solve such a problem.

[0004]

[Means for Solving the Problems]

 Therefore, the driver according to the present invention is provided with the handle 1, the shank 2, and the cutting edge receiving portion 3, and has the following configuration. That is, the shank 2 is formed separately from the handle 1, and different kinds of cutting edges 31 and 32 are formed at the front end and the rear end thereof, respectively. The handle 1 has a receiving portion 21 that detachably receives a part of the shank 2. The cutting edge receiving portion 3 is provided on the inner bottom portion of the receiving portion 21 and is made of a material having a strength higher than that of the handle 1. The cutting edge receiving portion 3 is engageable with the respective cutting edges of the shank 2. This prevents the shank 2 from rotating in the axial direction of the shank 2.

[0005]

[Action]

 In the present invention using the above means, the handle itself can be made of a resin which is inexpensive to manufacture, while at the same time, when the driver is used, the handle is provided with an appropriate strength provided on the inner bottom portion of the receiving portion 21. Since the blade edge receiving portion 3 that it has receives the moment transmitted from the blade edge of the shank 2, the generation of a large moment does not damage other parts inside the receiving portion 21. Further, since the blade edge receiving portion 3 for canceling out the moment is provided on the inner bottom portion of the receiving portion 21, it is possible to smoothly attach and detach the shank 2 without causing the resistance when the shank 2 is attached and detached. In addition, if the inner edge portion that receives the moment from the shank 2 body portion that is normally formed near the opening portion of the receiving portion 21 and the above-mentioned blade edge receiving portion 3 are provided side by side, the moment from the shank 2 is provided at two locations. As a result, the driver will be more durable and durable.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the driver according to the present invention. As shown in the drawing, the driver according to the present invention comprises a handle 1, a shank 2, and a blade edge receiving portion 3, and has the following configuration.

The shank 2 is a separate body from the handle 1, is appropriately formed into a long strip of material such as tool steel, and the cross-sectional shape of the body is rectangular or other polygonal shape. Is. A cutting edge 31 that can be fitted with a plus screw is formed at the tip of the shank 2, and a cutting edge 32 that can be fitted with a minus screw is formed at the other end. It is sufficient that the cutting edges of the shank 2 have different shapes corresponding to the shapes of the parts to which the screws are fitted, and the shapes are not limited to plus and minus different shapes. However, it is possible to implement even if the size differs by minus.

The handle 1 is made of a material suitable for manufacturing synthetic resin, wood, or the like, as in the conventional case. The handle 1 has an opening 22 on the tip side thereof and a receiving portion 21 that detachably receives a part of the shank 2. The receiving portion 21 is located at the center of the handle 1 (in a cross sectional view), and the inner peripheral edge portion 23 of the opening 22 is formed of a material having an appropriate strength such as plastic, vinyl chloride or metal. There is. The hollow inner cross-sectional shape of the inner peripheral edge portion 23 corresponds to the cross-sectional shape of the shank 2 body portion (not shown in order to avoid complication of the drawing). That is, if the cross-sectional shape of the shank 2 is substantially square, it is formed into a square having almost the same size. When the handle 1 is made of resin, the inner peripheral edge portion 23 can be installed by embedding it at the above-described position during molding.

The inside of the receiving portion 21 extends to near the rear portion 10 of the handle 1. The inner bottom portion of the receiving portion 21 communicates with the tip of the cutting edge receiving portion 3 described later. The cutting edge receiving portion 3 is made of a material such as steel having a higher strength than the handle 1. The shank 2 is engageable with the respective cutting edges of the shank 2, and the shank 2 is prevented from rotating in the axial direction with respect to the handle 1.

More specifically, the cutting edge receiving portion 3 is formed in a rivet shape as shown in FIG. That is, it is composed of a dish-shaped head portion 310 and a shaft portion 320 provided upright in the center of the back surface of the head portion 310. The cutting edge receiving part 3 is entirely formed of a suitable metal having sufficient strength. It is embedded in the center of the rear part of the handle 1, and the head part 310 is exposed from the rear end of the handle 1. Since the rear part of the driver may be hit with a hammer in some cases, the head 310 of the cutting edge receiving part, which has sufficient strength, is exposed to the outside as described above for the convenience. The shaft portion 320 of the cutting edge receiving portion 3 is provided with a plurality of skirt-shaped folds 330 on the surface. A plurality of folds 330 are provided along the length of the shaft portion 320, and the individual folds 320 gradually increase in outer diameter toward the head 310 side of the cutting edge receiving portion 3, that is, at the rear (the head 310). The side) has a skirt open. By forming such a fold 330, it functions as a barb which prevents the cutting edge receiving portion 3 from falling off the handle 1. The tip of the shaft portion 320 (opposite to the portion where the head portion 310 is provided) bears a part (center) of the inner bottom portion of the receiving portion 21 in the handle 1.

As shown in FIG. 3, a blade receiving groove 300 intersecting with the cross shape is formed at the tip of the shaft portion 320 of the blade tip receiving portion 3 (on the side opposite to the portion where the head portion 310 is provided). . FIG. 3 shows a state in which the cutting edge receiving portion 3 is viewed from the direction of arrow A in FIG. The cutting edge receiving portion 3 is formed so as to intersect the cross shape so as to be able to receive both of the cutting edges provided on the shank 2, but the cutting edges provided on both ends of the shank 2 are minus as described above. When they are mutually adjacent, they may be formed in one character. However, also in this case, the blade edge receiving portion 3 needs to have a size (width, length, depth) in which both blade edges can sufficiently enter even when crossing the cross shape.

In FIG. 1, the receiving portion 21 is narrowed toward the back so as to correspond to the shape (the narrowed portion) of the blade edge 32 of the shank 2, and the bottom portion thereof is the blade receiving groove of the blade edge receiving portion 3. It is formed so as to coincide with 300. However, the present invention is not limited to such an embodiment. For example, the diameter is not narrowed toward the back and the diameter is the same as far as the depth, and the tip surface of the shaft portion 320 of the blade receiving portion 3 (the blade receiving groove 300). It is also possible to implement it as the bottom part is formed by (including other parts).

By being formed as described above, the cutting edge receiving groove 300 of the cutting edge receiving portion 3 fits with the cutting edge of the shank 2 inserted into the receiving portion, and the moment transmitted from the shank 2 by the turning of the driver. Therefore, the moment is not directly applied to the handle 1 which is normally made of resin or the like. In particular, since the opening 22 and the inner peripheral edge portion 23 are provided side by side, the above-mentioned moments are received at two points, which further contributes to the dispersion of the force. Further, when hitting the rear part of the driver with a hammer etc. to loosen the strongly tightened screw, by hitting the head 310 of the blade tip receiving part 3, the force can be directly transmitted from the tip of the shaft part 320 to the shank 2. It is possible, and in this case the handle 1 is not overloaded.

[0014]

[Effect of device]

 According to the implementation of the present invention, when the driver is used, the blade edge receiving portion 3 provided at the inner bottom portion of the receiving portion 21 has a proper strength, and receives the moment transmitted from the blade edge of the shank 2, resulting in a large moment. By the occurrence of the above, the other parts in the receiving portion 21 are not damaged, and a great effect of prolonging the life of the driver is achieved. Further, while obtaining such an effect, the smoothness of attaching / detaching the shank 2 is not impeded. In addition, if the inner edge portion that receives the moment from the shank 2 body portion that is normally formed near the opening portion of the receiving portion 21 and the above-mentioned blade edge receiving portion 3 are provided side by side, the moment from the shank 2 is provided at two locations. The driver will be more durable and will last longer.

[Brief description of drawings]

FIG. 1 is an overall schematic vertical sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory view of a main part of the above embodiment.

FIG. 3 is an explanatory view of a main part of the above embodiment.

FIG. 4 is a front view showing a shank of a driver according to the related art and the present invention.

FIG. 5 is a vertical sectional view showing a handle of a conventional driver.

6 is an explanatory view showing a state where the shank of FIG. 5 is attached to the handle of FIG.

[Explanation of symbols]

 1 Handle 2 Shank 3 Blade receiving part 21 Receiving part

Claims (1)

[Scope of utility model registration request] 1. A handle (1), a shank (2), and a cutting edge receiving part (3) are provided, and the shank (2) is formed separately from the handle (1), and its front and rear ends. Different types of cutting edges (3
1) and (32) are formed, the handle (1) has a receiving portion (21) for detachably receiving a part of the shank (2), and the cutting edge receiving portion (3) includes a receiving portion (21). 21) is formed on the inner bottom of the shank (2) and is made of a material stronger than the handle (1), and is engageable with the respective cutting edges of the shank (2). A driver characterized by preventing rotation in the circumferential direction.