JP2002210671A - Socket for impact tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently transmit the impact force without rattling in the rotating direction. SOLUTION: In this socket 4, a plate spring 11 is externally fitted to an outer periphery of a first square hole 6 for fitting ad mounting an anvil 3 of an impact wrench, elastic pieces 12, 12 are inserted into first communication holes 9, 9, communicated to the first square hole 6, steel balls 10, 10 in the first communication holes are respectively projected and energized in the first square hole 6, and the socket 4 is rotationally urged to the anvil 3 in the direction opposite to the rotating direction of the anvil 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact tool socket used for tightening or releasing bolts and nuts using an impact tool such as an impact wrench.

[0002]

2. Description of the Related Art Impact tool sockets (hereinafter "sockets")
Abbreviated. ) Can be fitted with a first square hole such as a square that can be fitted to the anvil serving as the output shaft of the impact wrench at the rear end of the socket body, and a bolt head or nut can be fitted at the front end of the socket body. For example, when tightening the bolt, an anvil is fitted and mounted in the first square hole at the rear end, and the head of the bolt is fitted into the second square hole at the front end. If the impact wrench is driven by the engagement, the socket rotates integrally with the rotation of the anvil to tighten the bolt, and the bolt can be further tightened by an intermittent impact force from a striking mechanism built in the impact wrench.

[0003]

However, the first square hole and the second square hole of the socket are formed slightly large because they need to be attached to and detached from the anvil and the head of the bolt. And the impact force is not efficiently transmitted from the anvil to the bolts and nuts. However, as disclosed in Japanese Patent Application Laid-Open No. 7-164341, a ring-shaped spring is provided around the outer periphery of the socket, and at one end of the spring, a tongue portion which enters the hexagonal hole of the socket is formed. There is known an invention in which a bolt head and a side face of a nut that are fitted are elastically pressed to hold the bolt and the nut in the socket. Because it is intended to prevent falling, it is enough if bolts etc. are simply held in the hexagonal hole,
There is no consideration for rattling in the rotation direction, and loss of impact force is the same.

Accordingly, the first and second aspects of the present invention provide a hitting tool socket capable of efficiently transmitting an impact force from a hitting tool without rattling in a rotating direction. It is intended for that purpose.

[0005]

According to a first aspect of the present invention, an output shaft fitted and mounted on a first square hole is pressed to connect a socket body to the output shaft. And a biasing means for biasing the rotation in the direction opposite to the rotation direction of. In order to achieve the above object, a second aspect of the present invention is directed to a second aspect in which a bolt or a nut fitted to a second square hole is pressed to rotationally urge the socket body in the rotation direction of the output shaft. It is characterized by providing a force means. According to the third aspect of the present invention, in addition to the object of the first aspect, the second square hole is provided so that the second square hole is capable of transmitting an impact force more efficiently without rattling. 2 is provided. According to the invention described in claim 4, in addition to the object of any one of claims 1 to 3, in order to easily and rationally configure the urging means, the urging means is formed by a leaf spring externally provided on the socket body. The cut and raised elastic piece is penetrated into the socket body, and the output shaft or the bolt or the nut is pressed directly or indirectly by the elastic piece.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a front end portion of the impact wrench (the right side will be described as a front side). It can be transmitted to the anvil 3 at the tip with a predetermined torque accompanied by a striking action. The tip of the anvil 3 has a square cross-sectional shape with a chamfered corner. Reference numeral 4 denotes a socket. At the rear end of the cylindrical socket body 5, as shown in FIG. 2, a first square hole 6 having a rectangular cross section to which the anvil 3 can be fitted is formed, while the front end of the socket body 5 As shown in FIG. 3, a second rectangular hole 7 having a hexagonal cross section is formed in which a bolt head and a nut can be fitted. Also, the socket body 5
A ring-shaped concave groove 8 is formed at the position of the first square hole 6 on the outer periphery of the socket body 5.
A pair of first communication holes 9 and 9 are formed to communicate the concave groove 8 and the first square hole 6 at a point symmetrical position with respect to the axis of the first communication hole 9, and a steel ball 10 is provided in each first communication hole 9. It has been inserted.

[0007] A leaf spring 11 is provided in the concave groove 8. The leaf spring 11 is a belt-like member that substantially circulates around the concave groove 8.
The elastic pieces 12, 12 are cut and raised so as to be inserted into the first communication holes 9, 9, respectively, and the steel balls 10, 1 are formed.
0 is elastically pressed toward the first square hole 6 side. However, the first
The side of the communication holes 9, 9 that communicates with the first square hole 6 is opened with an area slightly smaller than the diameter of the steel ball 10, so that the steel balls 10, 10 are elastic pieces 12, 12.
As a result, it is urged in a state where it partially projects into the first square hole 6. The first communication holes 9, 9 are provided in the steel balls 10, 9 in a direction for urging the socket body 5 relative to the anvil 3 in a direction opposite to the rotation direction when the anvil 3 is tightened as indicated by an arrow in FIG. 2. 10 are arranged to work.

The structure of the urging means including the communication hole, the steel ball, and the leaf spring is similarly employed in the second square hole 7. That is, as shown in FIG. 3, in the socket body 5, a pair of second communication holes 13, which allow the outer periphery of the socket body 5 to communicate with the second square hole 7 at a position symmetrical with respect to the axis of the socket body 5, 13 is formed, and steel balls 14 and 14 are loosely inserted into the respective second communication holes 13, and a leaf spring 15 which substantially circulates around the socket main body 5 is provided on the outer periphery of the socket main body 5. Means are configured. At the position of the second communication holes 13, the leaf springs 15 are also formed by cutting and raising the elastic pieces 16, 16 so as to be inserted into the second communication holes 13, 13.
Is elastically pressed toward the second square hole 7, but the second communication hole 13
The opening on the side communicating with the second square hole 7 is slightly smaller than the diameter of the steel ball 14, so that the steel balls 14, 14 partially project into the second square hole 7 by the elastic pieces 16, 16. It will be energized in the state of having done.
The second communication holes 13, 13 are opposite to the first communication holes 9, 9 in that the steel balls 14, 14 correspond to the bolt heads 17 in the second square holes 7 by arrows in FIG. 3. The socket body 5 is arranged so as to work in a direction for urging the socket body 5 to rotate in the rotating direction at the time of tightening.

[0009] The socket 4 constructed as described above has a first
When the anvil 3 of the impact wrench 1 is inserted into the square hole 6, the steel balls 10, 1 projecting into the first square hole 6 are inserted.
0 urges the side surface of the anvil 3 point-symmetrically, so that the socket 1 slightly rotates in the direction opposite to the tightening direction with respect to the anvil 3 as shown in FIG. Each corner is brought into contact. Next, the second square hole 7 of the socket body 5
When a bolt head 17 or a nut is fitted to the bolt, the steel balls 14 projecting into the second square hole 7 similarly urge the side face of the head 17 point-symmetrically, as shown in FIG. As described above, the socket 1 is slightly rotated with respect to the head 17 in the tightening direction to bring the respective corners of the head 17 into contact with the inner surface of the second square hole 7. Therefore, when the impact wrench 1 is operated to rotate the anvil 3 in this state, the socket 4 rotates integrally with the anvil 3, and the socket 4 rotates the head 17 in the tightening direction. When the load on the anvil 3 increases due to the tightening, the impact force is intermittently applied to the anvil 3 by the impact mechanism in the impact wrench 1. Will be done.

In this tightening operation, the corners of the anvil 3 are always in contact with the first square holes 6 due to the urging of the steel balls 10, 10 in the first square holes 6. The anvil 3 does not rattle, and the impact force from the anvil 3 is transmitted to the socket 4 without loss. Similarly, since the corners of the head 17 are always in contact with the second square hole 7 due to the urging of the steel balls 14, 14 in the second square hole 7,
The head 17 does not rattle in the second square hole 7, and the impact force from the socket 4 is transmitted to the head 17 without loss. Therefore, according to the socket 4, the impact force generated in the impact wrench 1 can be efficiently transmitted to the head 17, and the work efficiency of the tightening operation is improved. Also, the steel balls 14, 14 urged into the second square holes 7 allow the bolt head 1 to be used.
7 and nuts are held in the second square holes 7, so that the bolts and nuts are carried to the tightening position without being dropped while being mounted on the socket 4, and the tightening work can be performed as it is, which is excellent in workability. The following effects can also be obtained.

In the above embodiment, a pair of communication holes and steel balls for rotationally urging the anvil and the bolt head are provided, but the number may be increased. The biasing of the steel ball can be replaced by a coil spring. However, if the elastic piece is cut and raised from the leaf spring as described above, the number of parts is reduced, and the biasing means is configured simply and rationally. It becomes possible. Furthermore, if the elastic piece alone can directly press the anvil or the bolt head, the steel ball can be omitted. And in the above embodiment,
Although the first invention is described between the anvil and the socket body, and the second invention is provided between the socket body and the bolt or the nut, this is a socket to which only one of the inventions is applied. A rattling preventing action is obtained. on the other hand,
Here, a structure for preventing rattling when tightening bolts and nuts is described. However, in the first square hole, a biasing means for rotating and biasing in a direction opposite to the direction in which the bolt or the like is loosened is used. The sockets for removal provided with biasing means for rotating and biasing in the direction of rotation to loosen, eliminating looseness when loosening bolts and nuts after tightening, and efficiently transmitting the impact force when releasing tightening. can do.

[0012]

According to the first aspect of the present invention, since the biasing means is provided in the first square hole, the anvil does not rattle in the first square hole. Can be efficiently transmitted to the socket, and the work efficiency of the tightening or releasing operation is improved. According to the second aspect of the present invention, since the urging means is provided in the second square hole, bolts and nuts do not rattle in the second square hole, so that the power is transmitted from the anvil to the socket. The impact force can be efficiently transmitted to the bolts and nuts, and the work efficiency of the tightening or releasing operation is improved. According to the third aspect of the invention, in addition to the effect of the first aspect, by providing the urging means of the second aspect in the second square hole, the first square hole and the second square hole can be provided. The rattling can be prevented, and the impact force generated by the striking tool can be more efficiently transmitted to the bolts and nuts, thereby further improving the work efficiency of the tightening work. According to the invention described in claim 4, in addition to the effect of any one of claims 1 to 3, the urging means allows the elastic piece cut and raised from a leaf spring provided on the socket body to penetrate into the socket body. Since the output shaft or the bolt or the nut is pressed directly or indirectly by the elastic piece, the urging means can be simply and rationally configured.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a front end portion of an impact wrench.

FIG. 2 is a sectional view taken along line AA.

FIG. 3 is a sectional view taken along line BB.

[Explanation of symbols]

1. Impact Wrench, 3. Anvil, 4. Socket, 5. Socket Body, 6. First Square Hole, 7. Second Square Hole, 9, First Communication Hole, 10, 14.・ Steel ball, 11,15 ・ ・ Leaf spring, 12,16 ・ ・ Elastic piece,
13. Second communication hole.

Claims (4)

[Claims] 1. A first square hole which can be fitted to and attached to an output shaft of a hitting tool at a rear end of a socket body, and a second square hole which can be fitted to a bolt or a nut at a front end of the socket body. A biasing tool socket formed so as to press the output shaft fitted and mounted in the first square hole to bias the socket body in a direction opposite to a rotation direction of the output shaft. A socket for a striking tool, characterized by comprising: 2. A first square hole which can be fitted and mounted on an output shaft of a hitting tool at a rear end of the socket body, and a second square hole which can be fitted with a bolt or a nut at a front end of the socket body. A hitting tool socket formed, comprising: an urging means for pressing the fitted bolt or nut in the second square hole to urge the socket body to rotate in the rotation direction of the output shaft. A hitting tool socket characterized by the above-mentioned. 3. The impact tool socket according to claim 1, wherein the urging means according to claim 2 is provided in the second square hole. 4. An urging means penetrates an elastic piece cut and raised from a leaf spring provided on a socket body into the socket body, and directly or indirectly presses an output shaft or a bolt or a nut by the elastic piece. The hitting tool socket according to any one of claims 1 to 3, wherein the hitting tool socket is used.