JPH0639897Y2 - Socket mounting structure for power wrench - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a structure for mounting a socket on a tip of an anvil of a power wrench for tightening screws such as bolts and nuts.

[Conventional technology]

Conventionally, for example, when screwing a screw such as a wheel nut of an automobile, a socket having a square hole into which the nut is fitted is attached to the anvil tip of a power wrench, and the nut is fitted into the socket to mount the anvil. The nut is screwed onto the bolt by rotating the bolt.

In the conventional socket mounting structure for such an anvil, a diametrical pin hole is provided at the tip of the anvil, while a pin insertion hole penetrating both sides of the cylindrical wall of the socket on the same center line as the pin hole. A hole is bored, the pin insertion hole is aligned with the pin hole of the anvil when the socket is attached, and the pin is inserted between both insertion holes, and the O-ring is fitted on the anvil to prevent the inserted pin from coming off. The configured one is adopted.

[Problems to be solved by the device]

However, according to such a structure, not only the pin insertion hole must be provided in the anvil and the socket, but also the structure becomes complicated because a pin, an O-ring and the like are required. After inserting the pin while aligning the pin insertion holes of the socket and the socket,
Since the O-ring must be covered, and the O-ring and the pin must be removed in order to remove the anvil, the socket replacement work becomes troublesome, and the pin, O-ring, etc. are lost. There was a problem that the socket could not be attached.

Further, there is a problem that a contact noise is generated at the connecting portion between the anvil and the socket during the rotation of the anvil, which causes noise.

The present invention solves these problems and provides a socket mounting structure for a power wrench that allows the socket to be mounted on the anvil with one touch and prevents contact noise between the anvil and the socket from leaking to the outside. It is intended.

[Means for Solving the Problems]

In order to achieve the above object, the socket mounting structure of the power wrench of the present invention has a fitting hole (7) for the socket (4) at the front part and a mounting hole having a diameter smaller than the fitting hole (7) at the rear part. Hard rubber holder (6) with holes (8)
The small-diameter mounting hole (8) of the wrench body (1) is fitted to the tip of the anvil (2), and an engaging shaft portion (which is an angular shaft protruding from the center of the tip surface of the anvil (2) ( 3) is made to pass through the center of the fitting hole (7) on the front side of the holder (6) and has its tip portion projected forward from the fitting hole (7). The base portion of the socket (4) is removably inserted into the space portion (9) between the mating shaft portions (3) to form an engagement hole (5) formed of a square hole in the base portion. It is characterized in that it is configured to be engaged with the portion (3).

[Action]

When the base portion of the socket (4) was fitted into the space portion (9) between the inner peripheral surface of the holder (6) and the outer peripheral surface of the anvil (2), it was provided on the inner peripheral surface of the base portion of the socket (4). The engaging hole (5) consisting of a square hole is fitted to the engaging shaft portion (3) protruding from the center of the tip surface of the anvil (2), and the outer peripheral surface is the inner circumference of the hard rubber holder (6). The socket (4) is held in a state of being connected to the anvil (2) by sliding contact with the surface and by the elastic force of the holder (6).

After mounting the socket (4) on the anvil (2) in this manner, a nut is fitted into the socket (4) and the anvil (2) is rotated to be screwed into the bolt.

Further, if the socket (4) is pulled out against the holding force of the holder (6), it can be easily removed from the anvil (2) and can be replaced with a desired socket.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. (1) is a power wrench holder such as an air impact wrench, and an engaging shaft portion formed of a square shaft such as a quadrangle or a hexagon at the center of the tip surface of the anvil (2). (3) is projectingly provided, and the engaging shaft (3) is engaged with an engaging hole (5) made of a square hole provided on the inner peripheral surface of the base of the socket (4) to form an anvil (2). Is configured to be transmitted to the socket (4).

(6) is a short cylindrical hard rubber holder, and a fitting hole (7) having the same shape as the outer peripheral surface of the base of the socket (4) is formed in the front portion of the holder, and the inner circumference of the fitting hole (7) is formed. The base outer peripheral surface of the socket (4) is elastically brought into sliding contact with the surface, and the rear inner peripheral surface is formed in a mounting hole (8) having a diameter smaller than the fitting hole (7). The holder (6) is attached to the anvil (2) by elastically fitting the hole (8) to the tip of the anvil (2), and the holder (6) is provided at the center of the tip surface of the anvil (2). The engaging shaft portion (3) is passed through the mounting hole (7) on the front side of the holder (6), and the tip portion thereof is projected forward from the mounting hole (7). (9) is a space for inserting the socket (4) provided between the fitting hole (7) of the holder (6) and the outer peripheral surface of the engaging shaft portion (3) of the anvil (2).

(10) is a fitting hole (7) and a mounting hole (8) of the holder (6)
The holder (6) is attached to the anvil (2) in a state in which it is substantially aligned with the base end step of the engaging shaft portion (3) of the anvil (2) at the peripheral step portion formed continuously with the anvil (2). ing.

In addition, the protrusions (11) and (12) are provided around the inner peripheral surfaces of the fitting hole (7) and the mounting hole (8) of the holder (6), respectively, and the outer peripheral surface of the base of the socket (4) is formed. And circumferential grooves (13) (14) fitted to these ridges (11) (12) on the anvil (2)
By engraving each of them, the holder (6) can be attached to the anvil (2) more firmly and the socket (4) can be held more reliably by the holder (6).

With this configuration, for example, when screwing a wheel nut (not shown) of an automobile, the socket (4) provided with a square hole (15) that fits the nut is provided with an engaging shaft of the anvil (2). Insert into part (3).

At this time, the base of the socket (4) is inserted into the space (9) between the inner peripheral surface of the fitting hole (7) of the holder (6) and the outer peripheral surface of the engaging shaft portion (3) of the anvil (2). Then, first, the engagement hole (5) of the socket (4) is fitted into the engagement shaft portion (3) of the anvil (2) protruding from the fitting hole (7) of the holder (6), and the protrusion is generated. The end portion is used as a guide and is inserted into the space portion (9) so that the engagement hole (5) of the socket (4) fits into the engagement shaft portion (3) of the anvil (2) and its outer peripheral surface is made of hard rubber. The socket (4) is slidably contacted with the inner peripheral surface of the holder (6) so that the socket (4) is moved to the anvil (2).
Is held in a state of being connected to.

Thus, after mounting the socket (4) on the engaging shaft portion (3) of the anvil (2), a nut is fitted into the socket (4), and the wrench body (1) is actuated to rotate the anvil (3). This is for screwing the nut.

After use, the socket (4) can be removed from the engaging shaft portion (3) of the anvil (2) by pulling out the socket (4) against the holding force of the holder (1). Can be replaced and the screwing operation can be performed again.

〔effect〕

As described above, according to the socket mounting structure of the power wrench of the present invention, the fitting hole (7) of the socket (4) is provided in the front part and the mounting hole (diameter smaller than the fitting hole (7) is provided in the rear part. The mounting hole (8) of the hard rubber holder (6) provided with 8) is fitted to the tip part of the anvil (2) of the wrench body (1) and protruded at the center of the tip surface of the anvil (2). The engaging shaft portion (3) made of a square shaft is passed through the central portion of the front fitting hole (7) of the holder (6) and the tip thereof is projected forward from the fitting hole (7). The base portion of the socket (4) is removably inserted into the space portion (9) between the fitting hole (7) and the engagement shaft portion (3), and the square hole provided in the base portion is removed. Since the engaging hole (5) is made to engage with the engaging shaft portion (3), the hard rubber holder (6) is provided at the rear portion. The small-diameter mounting hole (8) is fitted into the anvil (2) in a crimped state by elastic force so that it does not come off from the anvil (2) when carrying or using the electric wrench, and the socket (4) is The holder (6) can be easily attached by simply inserting it into the front fitting hole (7).

At that time, the tip of the engaging shaft portion (3) projecting from the center of the tip surface of the anvil (2) projects from the front fitting hole (7) of the holder (6) attached to the anvil (2). Therefore, first, by fitting the engaging hole (5) of the socket (4) into the protruding end of the engaging shaft portion (3), the axial center of the socket (4) is adjusted to the axial center of the anvil (2). The socket (4) with the projecting end as a guide in this state and the space between the engaging shaft (3) and the front fitting hole (7) of the holder (6). It can be easily inserted into the anvil (9), and thus the engagement hole (5) of the socket (4) is inserted into the anvil (2) despite the hard rubber holder (6) being attached. The engaging shaft portion (3) of (2) can be securely and easily engaged, and the socket (4) can be mounted more easily. It is what it is.

Further, in the mounted state, the socket (4) is fitted to the tip end portion of the anvil (2), and the outer peripheral surface thereof is held by the inner peripheral surface of the fitting hole (7) of the holder (6) and comes out. There is no fear that screwing work of nuts etc. can be performed smoothly, and if the socket (4) is pulled out from the anvil (2), it can be easily removed and socket replacement work is easy. Becomes

Also, the hard rubber holder (6) allows the socket (4)
Since the mounting part of is covered, the anvil (2)
The contact sound generated at the joint between the socket and the socket (4) is absorbed and prevented from leaking to the outside.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a partially longitudinal front view of the same, and FIG. 2 is a longitudinal front view of an essential part of another embodiment of the present invention. (1) …… Wrench body, (2) …… Anvil, (3)…
... engaging shaft, (4) ... socket, (5) ... engaging hole,
(6) …… Hard rubber holder, (7) …… Mating hole,
(8) ... Mounting hole, (9) ... Space.

Claims (1)

[Scope of utility model registration request] 1. A hard rubber holder (6) having a fitting hole (7) for a socket (4) in the front part and a mounting hole (8) having a smaller diameter than the fitting hole (7) in the rear part. ) The small-diameter mounting hole (8) of (1) is fitted on the tip of the anvil (2) of the wrench body (1), and the engaging shaft portion formed of an angular shaft projecting at the center of the tip surface of the anvil (2). (3) is in a state in which the front end portion of the holder (6) is passed through the central portion of the fitting hole (7) on the front side and is projected forward from the fitting hole (7),
The base portion of the socket (4) is removably inserted into the space portion (9) between the fitting hole (7) and the engaging shaft portion (3), and is formed by a square hole provided in the base portion. A socket mounting structure in a power wrench, characterized in that a dowel hole (5) is configured to be engaged with the engaging shaft portion (3).