JPH0957638A - Male threads with rotation stopper and female thread fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To preclude transmission of a raction force to the operator and prevent drop of the working effectiveness by furnishing a bolt, etc., at its tail which is the end of reverse side of the head part of male screw with a fixing hole for stopping rotation or a rotation stopper such as a fixing projection. SOLUTION: A shaft 9 is provided with a rotation stopper which is not movable in the rotating direction relative to the body of a female thread fastening device 3 but slidable in the axial direction, and is installed in a socket holder 7 in such a condition as penetrating it. That is, the shaft 9 is to prevent the base end from being drawn by the rotating motion of a nut 2 to cause rotation of the bolt 1 side, wherein the base end is secured fast to the body of the fastening device 3 by a pin 10 constituting rotation stopper. The base end is inserted slidably in a slide hole on the side with the body of the fastening device 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a male screw with a rotation stop having a fixing hole for preventing rotation or a rotation stopper such as a fixing protrusion provided at the tail of a male screw such as a bolt, and a female screw for tightening the female screw to the male screw with rotation stop. The present invention relates to a female screw tightening device to be used, and more particularly to a male screw with a rotation stop and a female screw tightening device which prevent a reaction force from being transmitted to a hand or the like when tightening a female screw.

[0002]

2. Description of the Related Art Many screw tightening tools utilizing the rotational driving force of an electric motor (or an air motor or the like) have been developed and used.

When tightening a screw with a screw tightening tool utilizing the driving force of such an electric motor (or an air motor), for example, when a bolt is inserted into a member to be mounted and tightened with a nut or the like, When these bolts, nuts, etc. are completely tightened to the end, the reaction force of the tightening force on the screw tightening tool side returns to the hand of the person who operates / holds this tool as a reaction.

Therefore, in an electric power tool or the like which generates such a high tightening force, a reaction force receiving member 10 is applied to the main body 100 of the electric power driver, such as the electric screwdriver shown in FIG.
Those provided with 1 are being developed. In such an electric screwdriver, the reaction force receiver 101 is used when tightening the bolt 102 inserted into the member to be attached 104, and the generated reaction force is applied to the member to be attached 104 instead of the main body 100 of the electric driver. It receives and absorbs the reaction force there.

[0005]

However, in such a screw tightening tool, the reaction force receiver is applied to the member to be tightened to transmit the reaction force so that the member to be tightened may receive the impact of the reaction force. Since it is absorbed, the work to be tightened may be damaged by a large reaction force in some cases, or the work posture may be restricted due to the tightening work with the reaction force receiver set. There is a risk of causing a fall or the like and causing an unexpected injury with a hand caught between the reaction force receiving member and the tightened member. Also, in this case, a catch for receiving the reaction force (for example, a locking portion on the member to be tightened)
Therefore, it cannot be applied to a member to be fastened without such a locking portion.

Further, in the screw tightening tool having such a structure, since an accessory such as a reaction force receiver is required, the operability is reduced and the convenience is reduced. Further, when tightening a female screw such as a nut to a male screw such as a bolt, the male screw may idle.

In view of the above-mentioned drawbacks, the present invention prevents the transmission of reaction force to the worker and at the same time prevents the workability from deteriorating. Further, there is no restriction on the work posture and from the viewpoint of safety. Another object of the present invention is to provide a convenient male screw and female screw tightening device with rotation stop.

[0008]

That is, according to the invention of claim 1, a tail hole which is an end portion on the side opposite to the head portion of a male screw such as a bolt has a rotation stop such as a fixing hole or a fixing projection for rotation prevention. I have.

Further, the invention of claim 2 is a female screw tightening device for screwing a female screw such as a nut to a male screw with a rotation stop by screwing, and when the female screw is rotated and tightened to the male screw, Fix the male screw in a rotationally immovable state ・
It is provided with a means for holding it.

According to the invention of claim 3, there is provided a female screw tightening device for screwing a female screw such as a nut onto a male screw with a rotation stop, which is rotated by a driving force of a driving means such as an electric motor or an air motor. -Shaped hollow rotating part, a tightening part that is mounted in a state of rotating integrally with the hollow rotating part, and is fitted into an internal thread of the nut or the like to be tightened; It is provided slidably in the axial direction, and the fitting part on the tip side fits into the rotation stop such as the fixing hole or fixing projection of the male screw, and the male screw rotates when tightening the female screw in rotation. And a rotation stop portion for preventing the rotation of the male screw with the rotation stopper when the female screw is tightened to the male screw with the rotation stopper, the male screw is prevented from rotating, and the tightening reaction force is absorbed. Reaction force with the a portion for gripping fastening in which is configured so as not transmitted.

Further, the invention according to claim 4 is a hand-held female screw tightening device provided with a gripping part to be gripped by an operator, and a hand gripping the gripping part of the female screw tightening device. It is configured so that the tightening reaction force is not transmitted.

[0012]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic side view showing a bolt 1 with a fixing hole according to the present invention. The bolt 1 with a rotation stop of this embodiment has a fixing hole 1 for stopping rotation (rotation stop) in a tail 12 which is an end opposite to the head 11.
2A (see FIG. 2) is provided. Although the fixing hole is used as the rotation stopper in this embodiment, the fixing hole is not limited to this, and a fixing protrusion or the like may be used as long as the same effect can be obtained.

FIG. 2 is a front view showing the bolt 1 with the nut 2 tightened. In this figure, a fixing hole denoted by reference numeral 12A is used to prevent rotation (rotation stop) when the nut 2 (see FIG. 2) is screwed into the bolt 1 screwed into the member to be attached (not shown). This is a hexagonal hole in this embodiment. In addition, as this fixing hole,
In addition to that of this embodiment, for example, one having a substantially D-shaped cross section,
For example, the one with a triangular hole in cross section should stop rotation (stop).
Of course, the shape is not limited to these, as long as it has a configuration capable of achieving this.

FIG. 3 is a schematic diagram showing a female screw tightening device 3 used when tightening a nut 2 on a bolt 1 with a fixing hole according to the present invention. The female screw tightening device 3 of this embodiment is configured to be gripped by an operator by hand.
The motor 4, the speed reduction mechanism 5, the socket holder 7, the socket 8, the shaft 9, and the (rotation stop) pin 10 are provided.

The motor 4 starts its operation with a start switch 32 provided on the grip portion 31 of the main body 3 of the device 3 to be held by hand, and operates with a limit switch (not shown) when the motor 4 is tightened to a predetermined position and completely tightened. Is automatically stopped. The limit switch may be configured to operate and stop when a constant current is reached. In addition, the motor 4 is also provided with a stop button separately so that an emergency stop can be performed by this. Further, although an electric motor is used in this embodiment, an air motor using a rotary operation by a fluid may be used as a matter of course.

The deceleration mechanism section 5 is designed to reduce the rotational speed on the motor 4 side and increase the torque, and an appropriate mechanism can be applied.

The socket holder 7 is composed of a hollow, substantially cylindrical member (which constitutes a hollow rotating portion), is rotatably held by the motor 4 via a bearing 71, and is rotationally driven by the motor 4. By force, it rotates integrally with the socket 8 attached to the tip side.

A shaft 9 penetrates the inside of the socket 8, and a mounting portion 8A that rotates while mounting the nut 2 in a fitted state is formed at a tip portion of the socket 8. In addition, different sockets are prepared according to the (outer diameter) dimension of the nut to be used, and these sockets are detachable from the socket holder 7 so that they can be appropriately replaced and used. However, in addition to this, for example, various sizes integrally formed with the socket holder side may be prepared, and these may be detachably exchanged with the main body of the female screw fastening device 3.

The shaft 9 constitutes a rotation stopper which is immovable in the rotational direction with respect to the main body of the female screw tightening device 3 and slidable in the axial direction, and penetrates into the socket holder 7. It is provided in the state. That is, the shaft 9 is for preventing the rotation of the bolt 1 side (rotation stop) by the base end portion 91 being dragged by the rotation operation of the nut 2 as shown in FIGS. 4 and 5. ,
The base end 91 is firmly fixed to the body side of the female screw fastening device 3 by the pin 10 that constitutes the rotation stopper. It should be noted that this base end portion 91 is provided with the slide hole 33 on the main body side of the female screw fastening device 3.
It is slidably inserted in. In addition, this slide hole 3
It is preferable that the length dimension of 3 is at least as large as the fastening dimension of the nut 2 that is fastened to the bolt 1.

A spring 34 is interposed between the base end 91 of the shaft 9 and the slide hole 33. The spring 34 applies an elastic force to the shaft 9 so as to always push the shaft 9 toward the front end, whereby the fixing hole 12 for the male screw is formed.
The tip portion of the shaft 9 is securely fitted to A, and is prevented from separating.

That is, in order to prevent a reaction force and the idling of the bolt 1, the nut 2 is provided at the tip of the shaft 9.
A fitting portion 95 that fits into the fixing hole 12A of the bolt 1 (hexagonal in cross section) is formed during screwing, but of course the outer shape of the fitting portion is appropriately changed according to the shape of the fixing hole. It is a thing.

Therefore, according to this embodiment, the bolt 1 is completely inserted, for example, into a tightened member (not shown).
Next, the female screw tightening device 3 of this embodiment is gripped by hand, and the nut 2 is tightened to the bolt 1. In this case, the tip side of the shaft 9 is fitted into the engagement hole 12A of the bolt 1 with the nut 2 penetrating the nut 2 to prevent the bolt 1 from rotating.

In this state, the female screw tightening device 3
When the start switch 32 is turned on, the motor 4 starts to operate, so that the socket holder 7 and the socket 8 rotate integrally via the reduction mechanism portion 5, and the nut 2 mounted on the socket 8 is tightened to the bolt 1. Will be taken. In this case, it is possible to effectively prevent the bolt 1 from idling in the same direction due to the tightening operation by the stopping force of the shaft 9 that is immovable with respect to the female screw tightening device 3, and to completely remove the nut 2 to the end. The reaction force generated when tightening is suppressed and absorbed by the same stopping force of the shaft 9.

[0024]

As described above, according to the present invention, it is possible to effectively prevent the male screw from idling in the same direction due to the tightening operation of the female screw by the restraining force of the rotation restraining portion in the immobile state. The force generated when the female screw is completely tightened to the end can be suppressed by the reaction force of the same rotation stopper, and absorbed, so there is no need to use a conventional reaction force receiver, and workability and operability are eliminated. It is possible to expect a drastic improvement in the above, and there is no fear that the member to be tightened will be damaged. Further, since it is possible to prevent a finger or the like from being caught between the member to be tightened and the reaction force receiver, it is possible to provide a female screw tightening device excellent in safety.

Further, according to the present invention, by utilizing only one side surface of the member to be tightened, the female screw can be completely tightened to the male screw, and at the same time, the reaction force can be absorbed, thereby further improving the workability. Can be planned.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing a bolt with a fixing hole according to the present invention.

FIG. 2 is a plan view showing a state in which a nut is screwed on the bolt.

FIG. 3 is a schematic configuration diagram showing a female screw tightening device according to the present invention.

FIG. 4 is an enlarged cross-sectional view showing a main part of a rotation stopper of the device.

FIG. 5 is a cross-sectional view taken along the line AA of the rotation stopper.

FIG. 6 is an explanatory view showing a conventional example.

[Explanation of symbols]

 1 Rotation Stop Bolt 12 Tail 12A (Rotation Stop) Fixing Hole 2 Nut 3 Female Thread Tightening Device 4 Electric Motor 5 Speed Reduction Mechanism 7 (Hollow Rotating Part) Socket Holder 8 (Tightening Part) Socket 9 (Rotation Stopping Part) Shaft 10 ( Rotation stop) Pin

Claims (4)

[Claims] 1. A non-rotating male screw having a rotation stop such as a fixing hole for preventing rotation or a fixing projection at a tail portion which is an end portion on the side opposite to the head portion of the male screw such as a bolt. 2. A female screw tightening device for screwing a female screw such as a nut onto a male screw with rotation stop to screw the male screw into a stationary state when the female screw is rotated and tightened to the male screw. A female screw tightening device comprising means for fixing and holding. 3. A female screw tightening device for screwing a female screw such as a nut onto a male screw with a detent, and a cylindrical hollow rotating portion that is rotated by a driving force of a driving unit such as an electric motor or an air motor. A tightening portion that is mounted so as to rotate integrally with the hollow rotating portion and is fitted into an internal thread of the nut or the like to be tightened, and is fixed in the hollow rotating portion in the rotational direction and slides in the axial direction. A rotation stop that is provided in a ready state and that the fitting part on the tip side fits into a rotation stop such as a fixing hole or a fixing projection of the male screw to prevent the male screw from rotating when the female screw is rotationally tightened. When the female screw is tightened to the male screw with rotation stopper, the male screw is prevented from rotating and the tightening reaction force is absorbed, so that the female screw tightening device is gripped at a position where the male screw is gripped. A female screw tightening device characterized in that the reaction force is not transmitted. 4. A hand-held female screw tightening device having a gripping part to be gripped by an operator, wherein the tightening reaction force is not transmitted to the hand gripping the gripping part of the female screw tightening device. The female screw tightening device according to claim 2 or 3, characterized in that.