JP4437597B2 - Tightening tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tightening tool used for tightening a fastener composed of bolts and nuts, and in particular, various fasteners having different sizes of tool engaging portions such as bolt heads and outer surfaces of nuts can be tightened. The invention relates to a general-purpose type tightening tool.
[0002]
[Prior art]
Conventionally, as a tightening tool of this type, according to Japanese Patent Laid-Open No. 7-251380, a plurality of engaging members that can be engaged with a tool engaging portion of a fastener are supported at the distal end of a rotating shaft so as to be movable in a radial direction. In addition, an adjustment sleeve that can be rotated with respect to the rotation shaft is provided on the outer periphery of the distal end portion of the rotation shaft, and the radial direction in which the inner periphery of the adjustment sleeve can come into contact with the radially outer surface of each engagement member There are known ones in which a plurality of seats having different positions are arranged in the circumferential direction. In this case, each engagement member is urged outward in the radial direction by a spring, and the seat that matches the size of the tool engagement portion of the fastener is rotated by the adjustment sleeve to radiate each engagement member. The engagement member is biased and held at a radial position that is regulated by this seat.
[0003]
[Problems to be solved by the invention]
In the conventional tightening tool, any kind of fastener is always tightened by engaging the engaging member with the tool engaging portion. Here, a fastener with a large size of the tool engaging portion has a large tightening torque, and the engaging member is forced to be easily worn and damaged, resulting in a decrease in durability.
This invention makes it a subject to provide the general purpose type clamping tool excellent in durability in view of the above point.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a tightening tool used for tightening a fastener, wherein a plurality of engaging members that can be engaged with a tool engaging portion of the fastener are radially disposed at the distal end portion of the rotating shaft. An adjustment sleeve that can be rotated with respect to the rotation shaft is provided on the outer periphery of the distal end portion of the rotation shaft, and a radially outer surface of each engagement member is brought into contact with the inner periphery of the adjustment sleeve. In a configuration in which a plurality of seats having different radial positions are arranged side by side in the circumferential direction, the tip of the rotating shaft can be engaged with a tool engaging portion of a predetermined size of the fastener. A socket part having a hole is formed, and slits facing the engagement holes are formed at a plurality of locations around the socket part so that each engagement member can be projected and retracted into the engagement hole through each slit. The radial direction of each engaging member in the radial position of the current position of the current position In the state of being contact with an outer surface, and so as to be displaced radially outward of the position to be engaged with the tool engagement portion sized to each engagement member is engaged with the engaging hole.
[0005]
According to the present invention, a fastener with a small tool engaging portion is engaged with an engaging member for tightening, and a fastener with a large tool engaging portion is engaged with a socket for tightening. be able to. In this way, by properly using the engaging member and the socket portion, it is possible to prevent the engaging member from being forced and to improve durability.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, reference numeral 1 denotes a rotating shaft of a tightening tool. A connecting hole 2 for connecting a driving shaft of a driving source such as a nut runner is formed at the tail end of the rotating shaft 1, and a tool member of a fastener W made of a bolt or a nut is formed at the tip of the rotating shaft 1. A socket portion 3 having an engagement hole 3a capable of engaging with the mating portion Wa is formed.
[0007]
As shown in FIG. 2, the socket portion 3 is formed with slits 3 b, 3 b, 3 b around the engagement hole 3 a over the substantially entire length of the socket portion 3. Then, three engaging members 4, 4, 4 that can be engaged with the tool engaging portion Wa of the fastener W are inserted into the slits 3b, 3b, 3b. Each engaging member 4 is pivotally supported by the socket portion 3 through a pin 4a at the tail end so as to be swingable in the radial direction, and the tip end portion thereof is engaged through each slit 3b by the swinging of each engaging member 4. It is made to appear and disappear in the joint hole 3a. Each engagement member 4 is urged radially outward by urging means 4b formed of a torsion coil spring.
[0008]
An adjustment sleeve 5 is provided on the outer periphery of the socket portion 3 so as to be rotatable with respect to the socket portion 3. The half inner peripheral surface on the tail end side of the adjustment sleeve 5 is formed into a cylindrical surface, but the half inner peripheral surface on the tip end side of the adjustment sleeve 5 can be brought into contact with the radially outer surface of the engagement member 4. Each engaging member 4 is formed with two first and second groove-shaped seats 5a, 5b arranged in the circumferential direction. These seats 5a and 5b have mutually different radial positions, and the first seat 5a is located relatively inward and the second seat 5b is located relatively outward. Then, when the adjustment sleeve 5 is rotated to a phase where the first abutment 5a coincides with the operating position opposite to the radially outer side surface of each engagement member 4 as shown in FIGS. 1 (A) and 2 (A). Thus, when the tip of each engagement member 4 protrudes into the engagement hole 3a and the adjustment sleeve 5 is rotated to a phase where the second abutment 5b matches the operating position, FIG. 1 (B) and FIG. As shown in FIG. 2 (B), each engaging member 4 is displaced radially outward from the position where it engages with the tool engaging portion Wa having a size that engages with the engaging hole 3b.
[0009]
The adjustment sleeve 5 is slidable in the axial direction with respect to the socket portion 3 and is normally biased and held by a spring 5d at a retracted position regulated by a stopper 5c provided on the rotary shaft 1. The seats 5a and 5b can be engaged with the engaging members 4 in the retracted position. When the adjustment sleeve 5 is moved forward in the axial direction from the retracted position, as shown in FIG. 1C, the engagement of the seats 5a and 5b with respect to the engagement members 4 is released, and the adjustment sleeve 5 is rotated. Dynamic operation is possible.
[0010]
According to the above configuration, for the fastener W having a small size of the tool engaging portion Wa, the engaging member 4 protrudes into the engaging hole 3a of the socket portion 3, and the engaging member 4 is moved to the tool engaging portion Wa. The fasteners W are tightened by engaging them with each other, and for the fasteners W having a large size of the tool engaging portion Wa, the engaging member 4 is displaced outwardly from the engaging hole 3a of the socket portion 3 to engage with it. The tool W can be fastened by engaging the tool engaging portion Wa with the hole 3a. Here, since the tool W having a large size of the tool engaging portion Wa is used when a large tightening torque is required, the tool W is fastened to the rotary shaft 1 via the movable engaging member 4. However, in this embodiment, the fastener W is tightened via the socket portion 3 integrated with the rotary shaft 1, so The combined member 4 or the like is not forced and the durability is improved.
[0011]
In the above embodiment, the engaging member 4 is pivotally supported by the socket portion 3, but the engaging member 4 may be supported by the socket portion 3 so as to translate in the radial direction. Each engagement member 4 is provided with three or more seats having different radial positions, and a plurality of seats excluding the seat located at the outermost radial direction have a plurality of large and small steps for projecting the engagement members into the engagement holes. It is also possible to cope with three or more types of fasteners having different tool engaging portions.
[0012]
【The invention's effect】
As is apparent from the above description, according to the present invention, the engagement member movable with respect to the rotating shaft and the socket portion integrated with the rotating shaft can be used properly according to the size of the tool engaging portion of the fastener. Further, it is possible to prevent the engaging member from being forced and improve the durability.
[Brief description of the drawings]
FIG. 1A is a longitudinal sectional view showing an adjustment state according to a small size fastener of the tool of the present invention, and FIG. 1B is a longitudinal sectional view showing an adjustment state according to a large size fastener of the tool of the present invention. (C) Longitudinal sectional view showing a state when the adjustment state of the tool of the present invention is switched. [Fig. 2] (A) A sectional view taken along line IIA-IIA in Fig. 1 (A), (B) IIB in Fig. 1 (B). -IIB line cross section [Explanation of symbols]
W Fastener Wa Tool engagement portion 1 Rotating shaft 3 Socket portion 3a Engagement hole 3b Slit 4 Engagement member 5 Adjustment sleeves 5a and 5b

Claims (1)

A tightening tool used for tightening a fastener,
A plurality of engaging members that can be engaged with the tool engaging portion of the fastener are supported at the distal end of the rotating shaft so as to be movable in the radial direction, and the outer periphery of the distal end of the rotating shaft is rotated with respect to the rotating shaft. A flexible adjustment sleeve is provided, and on the inner periphery of the adjustment sleeve, a plurality of seats that can be brought into contact with the radially outer side surface of each engagement member and that have different radial positions are arranged side by side in the circumferential direction. ,
The distal end portion of the rotating shaft is configured as a socket portion having an engagement hole capable of engaging a tool engagement portion of a predetermined size of the fastener,
A slit facing the engagement hole is formed at a plurality of locations around the socket portion so that each engagement member is projected and retracted into the engagement hole through each slit.
In a state in which the radially outer surface of each engaging member is in contact with the radially outermost seat among the plurality of seats, the tool member is sized to engage each engaging member with the engaging hole. Displaced radially outward from the position engaging the joint,
Tightening tool characterized by that.

Images