JPH0588873U - Impact wrench - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide an impact wrench that can be operated with one hand without being hit hard. An impact wrench 1 configured to rotate a nut or a bolt B by applying an impact force to the nut or the bolt B, and a fitting member 3 fitted to a head of the nut or the bolt B. The operating member 6 is swingably attached to the outer periphery of the fitting member 3, and the operating member 6 collides between the fitting member and the operating member as the operating member swings. It is characterized in that the contact portions 4, 10 and 15 are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an impact wrench that applies an impact force to a nut or bolt to rotate the nut or bolt.

[0002]

[Prior Art]

 Conventionally, in order to twist a nut or bolt, a spanner, which is a combination of a fitting part that fits these parts and an operating lever that rotates the fitting part, is fitted to the head part of the nut or bolt. , The operation lever is grasped and rotated.

In such a spanner, when the nut or the bolt is retightened or the screwed-in screw is loosened, after the wrench is fitted to the head of the nut or the bolt, the operation is performed. The lever is hit with a hammer or the like.

[0004]

[Problems to be solved by the device]

 However, in the conventional spanner, the operating lever is hit with a hammer or the like.Therefore, it is possible to damage the spanner, nut, etc. by hitting too hard and it is necessary to operate with both hands. However, there is a problem such as poor operability.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an impact wrench that can be operated with one hand without being hit hard.

[0006]

[Means for Solving the Problems]

 The impact wrench of the present invention is an impact wrench that applies an impact force to a nut or a bolt to rotate the nut or the bolt, and is a fitting member that is fitted to the head of the nut or the bolt. And an operating member that is attached to the outer peripheral portion of the fitting member in a swinging manner. The fitting member and the operating member collide with each other as the operating member swings. It is characterized in that a contact portion is provided.

[0007]

[Action]

 According to the impact wrench of the present invention, when the operating member is gripped and shaken with respect to the fitting member, an impact force in the rotation direction is applied to the fitting member via the abutting portion, and Causes the nut or bolt to be twisted. At the time of retightening or loosening, an appropriate impact force due to the swing of the operating member acts on the fitting member, and excessive impact force does not act on the bolts and nuts, and they are not damaged. Moreover, since the operating member and the fitting member are swingably connected, they can be operated with one hand, and the operability is high.

[0008]

【Example】

 An impact wrench according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the impact wrench 1 of the present embodiment includes a fitting member 3 formed by penetrating a fitting hole 2 that fits into the head of the bolt B. A projecting portion 4 projecting in the radial direction is formed on the coupling member 3. An operating member 6 having a tubular portion 5 formed at the tip thereof is connected to the projecting portion 4 by a pin 7 in a state where the tip of the projecting portion 4 is inserted and housed up to near the bottom of the tubular portion 5. ing. As a result, the operating member 6 is swingably connected to the fitting member 3 about the pin 7 in a plane orthogonal to the axial direction of the fitting hole 2 of the fitting member 3. A gap 8 is provided between the side surface (contact portion) 9 of the protrusion 4 and the inner wall (contact portion) 10 of the tubular portion 5 so that the operating member 6 can be rotated relative to the fitting member 3. Are formed. A gap is formed between the front and back surfaces 11 of the protruding portion 5 and the inner surface 12 of the tubular portion 5 to such an extent that the swinging of the operating member 6 is not hindered. The fitting hole 2 has a so-called dodecagonal shape in which two regular hexagonal grooves corresponding to the head of the bolt B are formed with their phases shifted from each other.

Next, a method of using the impact wrench 1 of this embodiment will be described.

First, the head of the bolt B is inserted into the fitting hole 2 of the fitting member 3. Then, the operating member 6 is gripped and rotated, and the operating member 6 is rotated about the pin 7 as indicated by a chain double-dashed line in FIG. Then, the operating member 6 rotates with respect to the fitting member 3 by the amount of the gap 8, and the inner wall 10 of the tubular portion 5 of the operating member 6 collides with the side surface 9 of the protruding portion 4 and the fitting member 3 3 is shocked. Due to this impact force, the fitting member 3 rotates about the axis and the bolt B is twisted.

Since the rotation amount of the operation member 6 is regulated by the gap 8, the excessive impact force does not act on the fitting member 3, and the bolt B can be prevented from being damaged.

Further, since the operating member 6 and the fitting member 3 are connected by the pin 7, it is sufficient to rotate the operating member 6 with one hand in order to screw the bolt B. The workability can be increased.

FIG. 3 shows an impact wrench 11 according to another embodiment of the present invention. In this device, a fitting member 13 having a fitting hole 12 is provided with a projecting portion 14, and an operating member 16 is swingably connected to the projecting portion via a pin 17 so that the side surface of the projecting portion 14 can be operated. The stopper portion 15 is provided so that the operating member 16 abuts when the member 16 is swung. The side surface of the protruding portion 14 and the stopper portion 15 form the contact portion of the present invention. Also with this, similarly to the above-mentioned embodiment, the bolt B can be twisted by swinging the operation member 16 to exert an impact force on the stopper portion 15.

[0015]

[Effect of the device]

 As described above, according to the impact wrench of the present invention, the fitting member fitted to the head of the nut or the bolt, and the operation member swingably mounted on the outer peripheral portion of the fitting member. Since the abutting portion is provided between the fitting member and the operating member, the abutting portion colliding with the swinging motion of the operating member. It can be operated with one hand.

[Brief description of drawings]

FIG. 1 is a plan view showing an impact wrench according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line EE of FIG.

FIG. 3 is a plan view showing an impact wrench according to another embodiment of the present invention.

[Explanation of symbols]

 1,11 Impact wrench 3,13 Fitting member 4,14 Projection part (contact part) 5 Cylindrical part 6,16 Operation member 7,17 Pin 10 Inner wall (contact part) 15 Stopper part

Claims (1)

[Scope of utility model registration request] 1. An impact wrench adapted to rotate a nut or a bolt by applying an impact force to the nut or the bolt, and a fitting member fitted to the head of the nut or the bolt, and the fitting member. An operating member is swingably attached to the outer periphery of the coupling member, and an abutting portion is provided between the fitting member and the operating member, the abutting portion colliding with the operating member when the operating member swings. Impact wrench that is characterized by