JP2001347463A - Extension bar and fastening tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extension bar capable of being fastened at an arbitrary length position of a main bar or fastened in a state it is inclined to a rotational central shaft of a fastening tool. SOLUTION: The main bar 101 is formed into the shape of a regular polygonal cylinder, insertion squares 102a and 102b are mounted on both ends of the main bar 101, and a tip part and a basic part of one 102b of the insertion squares are thinned with respect to its central part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an extension bar used by being inserted into a socket of a socket wrench.
And a tightening tool having the same.

[0002]

2. Description of the Related Art FIG. 9 is a perspective view showing an example of a conventional socket wrench. In the figure, a socket wrench 200
Has a ratchet handle 201 provided with a ratchet portion 202 at one end, and a socket 203 as an engaging portion. The ratchet portion 202 rotatably supports the insertion angle 205, and the rotation direction of the insertion angle 205 is regulated by a direction switching knob 204. When the insertion angle 205 of the ratchet part 202 is inserted into the insertion port 203a, the socket 203
02 is rotatably held. Also, a socket hole 203b provided on the side opposite to the insertion port 203a.
With a fastener such as a nut. In the socket wrench 200 having such a configuration, the operator
The ratchet handle 20 around the ratchet portion 202
The socket 203 engaged with the fastener can be rotated only in the tightening direction or the loosening direction only by rotating the socket 1 back and forth at an arbitrary angle.

However, in FIG. 9, an obstacle 501 is provided around a hexagonal bolt 500 as a fastener, and the ratchet handle 201 is moved before the socket 203 and the hexagonal bolt 500 are engaged. The object 501 gets caught. Therefore, when such an obstacle 501 exists, as shown in FIG. 10, the extension bar 204 is connected between the socket 203 and the ratchet handle 201, and the ratchet is placed at a position where the obstacle 501 is not caught. The handle 201 is rotated.

[0004]

However, in the conventional extension bar 206, the ratchet handle 20 is not provided.
The connection position with 1 can be provided only at one end thereof. Therefore, as shown in FIG. 11, when there is an obstacle 501 that restricts the rotation angle of the ratchet handle 201 around this connection position, the ratchet handle 201 can be rotated only within the restriction angle θ. Since it is not possible, the efficiency of the fastening operation is significantly reduced.

In FIG. 10, a hexagon bolt 500
Hex bolt 500, socket 2
03. The extension bar 206 must be held straight so that the respective rotation center axes of the extension bar 206 are aligned. Therefore, when there is any obstacle on the extension of the rotation center axis of the hexagon bolt 500 and the extension bar 206 must be inclined with respect to the rotation center axis, the tightening operation of the hexagon bolt 500 should be performed. Could not.

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing background, and has as its object to tighten a main body bar at an arbitrary length position or to tilt the main body bar with respect to the rotation center axis. An object of the present invention is to provide an extension bar capable of performing a tightening operation in a state where the extension bar is set, and a tightening tool using the same.

[0007]

To achieve the above object, according to the present invention, there is provided an extension bar having a main body bar and an insertion angle for connecting to a socket of a socket wrench. Into a regular polygonal prism,
An insertion angle is provided at both ends of the main body bar, and a tip portion and a root portion of one of the insertion angles are formed thinner than a central portion.

According to a second aspect of the present invention, there is provided a tightening tool for tightening a fastener such as a nut, wherein the extension bar according to the first aspect and a ratchet wrench corresponding to the diameter of the main body bar are provided. It is characterized by having.

According to a third aspect of the present invention, there is provided the fastening tool according to the second aspect, further comprising a gripping member that is inserted into the extension bar and gripped by an operator in a state of being engaged. Things.

According to a fourth aspect of the present invention, in the tightening tool of the third aspect, a rotational force is applied to the ratchet mechanism of the ratchet wrench in a state where the grip portion of the ratchet wrench is fixedly held without rotating. A knob member for transmission is provided on the ratchet wrench.

In these inventions, the main body bar of the extension bar is formed in a regular polygonal prism, and a tool such as a spanner, a monkey wrench, a spectacle wrench, a ratchet wrench is engaged with an arbitrary length of the main body bar. Then, the main body bar can be rotated. Therefore, the tightening operation can be performed at an arbitrary length position of the main body bar. In addition, two extension bars are provided at both ends of the main body bar of the extension bar.
Of the two insertion angles, if the socket is inserted into the insertion angle of the tip part and the root part that are formed thinner than the center part,
As shown in FIG. 1, the joint between the insertion angle (102b) and the socket (203) can be rotated while bending the joint. Therefore, the tightening operation can be performed in a state where the extension bar is inclined with respect to the rotation center axis of the fastener.

[0012] In particular, in the fastening tool of the second aspect, the socket is repeatedly hooked on the fastener such as the nut by the ratchet mechanism of the ratchet wrench engaged with an arbitrary length position of the main body bar. Even if the so-called re-hanging operation of tightening the fastener while fixing is not performed, the fastener can be tightened only by reciprocating the ratchet wrench at an arbitrary angle.

[0013] In particular, in the fastening tool of the third aspect, the fastening operation of the fastener can be performed not only by the ratchet wrench but also by the gripping member inserted into the extension bar.

In particular, in the fastening tool according to the fourth aspect, the fastening operation of the fastener can be performed also by operating the handle member provided on the ratchet wrench.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an extension bar to which the present invention is applied will be described below. FIG. 2 is a perspective view showing the extension bar according to the present embodiment together with a socket. In FIG. 2, the main body bar 101 of the extension bar 100 is formed in a regular hexagonal column shape that can be engaged with a tool (not shown) such as a spanner, a monkey wrench, a spectacle wrench, and a ratchet wrench. At both ends of the main body bar 101, insertion angles 102a and 102b that can be inserted into the insertion holes 203a of the socket 203 are provided.

A positioning ball 103 is provided on one side surface of each of the insertion angles 102a and 102b.
The positioning sphere 103 is urged by urging means (not shown) so as to protrude from the side surfaces of the insertion angles 102a and 102b, but when the insertion angles 102a and 102b are inserted into the insertion port 203a of the socket 203. Is designed to come into contact with the inner surface of the insertion port 203a and to be retracted from the side surface. When the insertion angles 102a and 102b are inserted to their proper positions, the positioning sphere 103 which has been retracted so far projects from the insertion angle side surface facing a positioning recess (not shown) provided on the inner surface of the square insertion port 203a. . With the positioning sphere 103 protruding in the insertion port 203a in this manner, the insertion angles 102a and 103b are fixed at the regular insertion positions (depths).

Balls 104 having the same configuration as the positioning ball 103 are provided near both ends of the main body bar 101, respectively. The functions of these balls 104 will be described later.

Of the two insertion angles 102a and 102b,
As shown in FIG. 3, the tip portion and the root portion of 102b are formed thinner than the central portion. In such a configuration, as shown in FIG. 1, the insertion port 203a of the socket 203 and the insertion angle 102b can be engaged with the joint between the socket 203 and the main body bar 101 being bent. In the bent state, the rotation axis X1 of the socket 203 and the rotation axis X2 of the main body bar 101 including the insertion angle 102b are displaced.
The socket 203 cannot be rotated simply by rotating the main body bar 101 about the rotation axis X2. However, the socket 203 can be rotated by rotating the main body bar 101 about the rotation axis X2 while slightly changing the bending posture of the joint portion.

FIG. 4 shows the extension bar 10.
0 is a perspective view showing a ratchet wrench 150 used in combination with the socket 203. FIG. In FIG. 1, the ratchet wrench 150 includes a ratchet portion 152 at one end of a rod-shaped handle 151. Numerous fine grooves 155 are formed on the peripheral surface on the other end side of the handle 151 formed of a steel material such as iron or stainless steel so that an operator can easily grip the handle. The ratchet portion 152 rotatably supports a drum-shaped socket portion 153. The socket portion 153 has a hexagonal hole that is engaged with a fastener such as a hexagonal bolt or a hexagonal nut. A ratchet 153 a is formed on the outer peripheral surface of the socket portion 153 so as to mesh with the tip of the direction switching lever 154. In the illustrated example, of the two ends of the direction switching lever 154 formed in a crescent shape, the other end (not shown) is engaged with the ratchet wheel 153a at a position not shown. In this state, the socket 15
When 3 is rotated clockwise in the figure, the tip (not shown) of the direction switching lever 154 is hooked on the claw side surface of the ratchet wheel 153a, so that the clockwise rotation of the socket portion 153 is prevented. However, when the socket 153 is rotated counterclockwise in the drawing, the tip (not shown) is flipped by the claw of the ratchet wheel 153a and does not catch on the side surface of the claw. Rotation is allowed. On the other hand, when the direction switching lever 154 is swung about the shaft pin 154a in the direction of arrow A in the drawing, the illustrated end of the direction switching lever 154 comes into contact with the ratchet wheel 153a. In this state,
The clockwise rotation of the socket 153 is allowed, and the counterclockwise rotation is prevented. In the ratchet wrench 150 having such a configuration, the operator simply reciprocates the handle 151 at an arbitrary angle around the ratchet portion 152 to engage the socket portion 1 engaged with the nut or the like.
53 can be rotated only in the tightening or loosening direction.

The ratchet wrench 15 shown in FIG.
0, the knob member 1 is attached to the end of the socket portion 153 so that the socket portion 153 can be rotated even when the handle 151 is fixedly held without rotating.
56 are connected. If the socket part 153 is rotated by the knob member 156, a fastener such as a hexagon bolt can be temporarily tightened to a certain strength.

FIG. 5 shows the extension bar 10.
It is a perspective view which shows an example of the tightening operation of the tightening tool which consists of a combination of the socket 0, the socket 203, and the ratchet wrench 150. As shown in the drawing, in this fastening tool, after a socket (not shown) of the ratchet wrench 150 is inserted into the extension bar 100 and engaged with the extension bar 100, the ratchet wrench 150 is connected to the main body bar 1 of the extension bar 100.
01, the main body bar 10 is slid.
The rotation operation of the ratchet wrench 150 can be performed at any arbitrary length position. Therefore, the ratchet wrench 150 can be rotated at a position not obstructed by the obstacle 501. Further, the ratchet mechanism of the ratchet wrench 150 allows the ratchet wrench 150 to reciprocate at an arbitrary angle without performing a so-called re-latching operation of tightening the fastener while repeatedly re-fastening the socket 203 to a fastener such as a hexagon bolt. Just by rotating, the fastener can be tightened.

FIG. 6 is a perspective view showing a gripping member used in combination with the tightening tool shown in FIG. In FIG. 6, the gripping member 160 is formed into a shape that fits the palm, and is inserted into the end of the main body bar 101 of the extension bar 100 to engage with the hexagonal hole 16.
1 is provided. The depth of the hexagonal hole 161 is formed larger than the lengths of the insertion angles 102a and 102b of the extension bar 100.

The main bar 1 of the extension bar 100
When the handle member 160 is inserted into the main body bar 101, the sphere 104 is caught in the hexagonal hole 161 of the handle member 160, thereby preventing the handle member 160 from coming off the main body bar 101. Plays.

After inserting the socket portion 153 of the ratchet wrench 150 into the extension bar 100,
When the handle member 160 is inserted into the end of the extension bar 100, the fastening operation of the fastener can also be performed by the handle member 160. However, in the ratchet wrench 150, the fastener can be tightened by the movement of the entire arm, whereas in the grip member 160, the fastener is tightened mainly by the snap movement of the wrist, which is smaller than when the ratchet wrench 150 is used. Tightening force becomes weak. For this reason, it is desirable that the handle member 160 be used for temporary fastening of the fastener similarly to the knob member 156.

Here, even if the main body bar 101 of the extension bar 100 is directly gripped and rotated by hand, the fastener can be temporarily tightened to a certain strength. However, in such a temporary tightening, when a small foreign matter such as sand is caught in a screw portion of the fastener (for example, a screw portion of a nut and a bolt), the tightening force is insufficient. Can not be rotated. On the other hand, the knob member 1
Since the turning radius of the handle 56 and the handle member 160 is larger than the turning radius of the main body bar 101 of the extension bar 100, the principle of leverage works, and
Can exert a stronger tightening force than when directly gripping. For this reason, even when a minute foreign substance is biting in the screwing portion of the fastener, the fastener can be easily rotated.

In general, when the fastener is temporarily tightened by the ratchet wrench 150, since the screwing force of the fastener is extremely weak, when the handle 151 rotates in the direction opposite to the tightening direction, the ratchet mechanism is activated. The fastener also reverses rotation before functioning. Therefore, in order to avoid such reverse rotation, it is necessary to rotate the handle 151 in one direction instead of reciprocating rotation, which deteriorates the work efficiency of the temporary fastening. On the other hand, in the temporary fastening of the fasteners by the knob member 156 or the handle member 160, the fasteners can be rotated in the tightening direction without rotating the fasteners in reverse by holding them while holding them.

FIG. 7 shows the extension bar 10.
FIG. 10 is an explanatory view showing an example of a tightening operation of a tightening tool including a combination of a socket 0, a socket 203, a ratchet wrench 150, and a gripping member 160. FIG. 7 shows a state in which the ratchet wrench 150 is inserted into the extension bar 100 from the knob member 156 side. In such a state, when the handle 151 of the ratchet wrench 150 is gripped with, for example, the left hand, the fastener is temporarily tightened without holding the handle 151 by holding the grip member 160 with the empty right hand. be able to. Further, for example, when the handle 151 is gripped with the right hand, the fastener can be temporarily tightened without holding the handle 151 by gripping the knob member 156 with the empty left hand.

FIG. 8 is an explanatory view showing a state in which the ratchet wrench 150 is inserted into the extension bar 100 from the side opposite to the knob member 156. Generally, in the tightening operation, the handle 151 of the ratchet wrench 150 is used.
By gripping the extension bar 150 indirectly, the extension bar 100 is caused to take a posture such that the extension bar 150 is straightened with respect to a fastener such as a hexagon bolt (not shown). In order to apply the temporary tightening force to the extension bar 150 having such a posture, it is desirable to perform the temporary tightening operation at a position relatively close to the ratchet wrench 150 supporting the extension bar 150. For example, the ratchet wrench 150 gripped by the left hand is placed in the socket 2
When performing the temporary tightening operation by sliding to the side of 03,
The right hand becomes difficult to reach the handle member 160 inserted into the right end of the extension bar 150 in the drawing. But,
Since the right hand can easily reach the knob member 156, the temporary tightening can be easily performed by rotating the knob member 156 with the right hand.

On the other hand, when the extension bar 100 has a relatively large diameter and a relatively large weight, it may be difficult to support the extension bar 100 only with the ratchet wrench 150 gripped by one hand.
However, for example, when the ratchet wrench 150 gripped by the left hand is slid to the handle member 160 side from the illustrated state to perform the temporary fastening operation, the right hand can easily reach the handle member 160. Then, if the grip member 160 is gripped with the right hand, the grip member 160 can be rotated while supporting the extension bar 100 with both hands, and the temporary tightening can be easily performed.

The knob member 156 and the handle member 160 are desirably made of a resin material and subjected to a rough surface finishing process. This is because with such a knob member 156 and the handle member 160, the frictional resistance with the palm becomes larger than that made of a metal material, and it becomes difficult to slide.

It is desirable to use the knob member 156 having a shape and size that fits in the palm of the hand. In such a knob member 156, unlike a circular member, the knob member 156 is easily caught in the palm of the hand,
Even wet hands or oily hands can be easily rotated. In addition, because it is large enough to fit in the palm, the fastener can be turned by the force of the wrist instead of the force of the fingertip. Can be provided. Therefore, when a small foreign matter such as sand is caught in the screwed portion of the fastener, even if the fastener cannot be directly rotated only by the force of the fingertip, the fastener can be easily rotated by the knob member 156 and temporarily. Can be tightened.

Note that the extension bar 1
Although the example in which 00 is used in combination with the ratchet wrench 150 has been described, the extension bar may be used in combination with another tool such as a spanner, a monkey wrench, or an eyeglass wrench.

[0033]

According to the first aspect of the present invention, a rotation operation is performed at an arbitrary length position of the main body bar, and a rotation operation is performed with the extension bar inclined with respect to the rotation center axis of the fastener. There is an excellent effect that can be.

In particular, according to the second aspect of the present invention, there is an excellent effect that the fastener can be tightened without performing the re-mounting operation only by reciprocating the ratchet wrench at an arbitrary angle.

In particular, according to the invention of claim 3, there is an excellent effect that the fastening operation of the fastener can be performed not only by the ratchet wrench but also by the gripping member inserted into the extension bar.

In particular, according to the invention of claim 4, the operation of the handle member provided on the ratchet wrench also enables
There is an excellent effect that the fastening operation of the fastener can be performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an insertion state of an insertion angle of an extension bar according to the present invention and an insertion hole of a socket.

FIG. 2 is an exemplary perspective view showing an extension bar according to the embodiment together with a socket;

FIG. 3 is a side view showing the insertion angle of the two insertion angles of the extension bar in which the tip portion and the root portion are formed thinner than the center portion.

FIG. 4 is a perspective view showing a ratchet wrench used in combination with the extension bar.

FIG. 5 is a perspective view showing an example of a tightening operation of a tightening tool including a combination of the socket, the extension bar, and the ratchet wrench.

FIG. 6 is a perspective view showing a gripping member used in combination with a tightening tool.

FIG. 7 is an explanatory view showing an example of a tightening operation of a tightening tool including a combination of the socket, the extension bar, the ratchet wrench, and the holding member.

FIG. 8 is an explanatory view showing a state in which the ratchet wrench is inserted into the extension bar from a side opposite to the knob member.

FIG. 9 is a perspective view showing an example of a conventional socket wrench.

FIG. 10 is a perspective view showing the same socket wrench in a state where a conventional extension bar is combined.

FIG. 11 is a perspective view showing a state where there is an obstacle around a connection position between a conventional extension bar and a ratchet handle.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 extension bar 101 main body bar 102a, 102b insertion angle 103 positioning ball 104 ball 150 ratchet wrench 151 handle 152 ratchet portion 153 socket portion 153a ratchet wheel 154 direction switching lever 155 groove 156 knob member 160 gripping member 161 hexagon socket 200 socket wrench 201 Ratchet handle 202 Ratchet part 203 Socket 203a Insertion port 203b Socket hole 204 Direction switching knob 205 Insertion angle 206 Conventional extension bar

Claims (4)

[Claims] 1. An extension bar having a main body bar and an insertion angle for connecting to a socket of a socket wrench, wherein the main body bar is formed into a regular polygonal prism, and insertion angles are provided at both ends of the main body bar. An extension bar, wherein a tip portion and a root portion of one of the insertion angles are formed thinner than a central portion. 2. A tightening tool for tightening a fastener such as a nut, comprising: the extension bar according to claim 1; and a ratchet wrench corresponding to a diameter of the main body bar. Attached tool. 3. The tightening tool according to claim 2, further comprising a gripping member that is inserted into the extension bar and gripped by an operator in a state of being engaged. 4. A tightening tool according to claim 3, wherein a knob member for transmitting a rotational force to a ratchet mechanism of the ratchet wrench in a state where the grip portion of the ratchet wrench is fixedly held without rotating. A tightening tool provided on the ratchet wrench.