JP2009125906A - Marking torque wrench - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a marking torque wrench for performing marking automatically without requiring a link mechanism or the like by utilizing displacement which is generated accompanied by the action of a toggle mechanism. <P>SOLUTION: When a fastening force reaches a predetermined value, the toggle mechanism acts, and a stamping mechanism (a stamp-pushing rod 7 and a marking stamp 5) acts to perform the marking automatically. The marking torque wrench comprises a starting magnet 22 for moving in conjunction with the displacement accompanied by the action of the toggle mechanism, and a stamp-pushing magnet 9 mounted on the stamping mechanism side and causing the magnetic forces of itself and the starting magnet to act each other when the starting magnet 22 moves. The stamping mechanism is constituted so that the stamp-pushing magnet 9 moves by magnetic forces acting between the starting magnet 22 and the stamp-pushing magnet 9 when the starting magnet 22 moves, to thereby perform the stamping action. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, when a bolt or nut is tightened, the toggle mechanism operates when the tightening force reaches a predetermined value so that the tightening force becomes constant and the tightening with the predetermined tightening force is completed. The present invention relates to a marking torque wrench that can be automatically marked.

  A torque wrench used for tightening bolts and nuts is a pre-set that prevents the tightening force from becoming excessive or insufficient by operating the toggle mechanism when the tightening force reaches a predetermined value. The set type is widely used. By properly using this torque wrench, it is possible to perform a bolt tightening operation or the like with a constant tightening force.

On the other hand, there are many cases where bolt tightening completion marking is implemented as a measure for preventing forgetting bolt tightening in an assembly process in a production line or the like. Recently, a torque wrench with a marking function (see, for example, Patent Document 1) that can automatically perform marking when tightening is completed is commercially available from a torque wrench manufacturer.
As a torque wrench mechanism with marking function currently provided, when the bolt tightening torque is reached, the displacement of the ratchet part and the swing of the handle part due to the wrench toggle operation is used to operate the marking stamp via a mechanical link Is.

In addition to this, a torque wrench has also been proposed by utilizing the pressure of air (see Patent Document 2). In this torque wrench, the stamping operation is performed with an air supply force supplied from the outside by an air hose or the like.
JP-A-6-297352 JP-A-62-130182

However, the conventional torque wrench using the mechanical link described above has a problem that it is difficult to reduce the size of the component parts for securing the stamp stroke, and the number of parts increases, so that it is difficult to handle as a work tool. Furthermore, there are problems such as the occurrence of failures due to wear of moving parts.
On the other hand, a torque wrench that uses air pressure can eliminate the problem by eliminating a mechanism for transmitting a driving force, such as a link mechanism, but there is a problem that an air hose or an air supply source is required. .

  The present invention has been made against the background of the above circumstances, and provides a marking torque wrench that can perform marking by utilizing the magnetic force of a magnet without requiring a special mechanism or external connection. With the goal.

That is, of the marking torque wrench of the present invention, the first aspect of the present invention is that the toggle mechanism operates when the tightening force for the bolt or nut reaches a predetermined value, and the stamp mechanism operates to automatically For torque wrench marking,
An activation magnet that moves in conjunction with the displacement associated with the operation of the toggle mechanism;
A stamp pressing magnet that is attached to the stamp mechanism side and in which the magnetic force acts by the movement of the starter magnet;
The stamp mechanism is configured such that a stamping operation is performed by moving the stamp pressing magnet by a magnetic force acting between the starting magnet and the stamp pressing magnet by the movement of the starting magnet. And

  In the marking torque wrench of the second aspect of the present invention, in the first aspect of the present invention, the starting magnet and the stamp pressing magnet repel each other due to the same magnetic force acting on each other as the starting magnet moves. It is arranged so that force is generated.

  The marking torque wrench of the third aspect of the present invention is the marking torque wrench of the first or second aspect of the present invention, wherein the activation magnet returns to the initial position when the operation of the toggle mechanism is released, and the activation magnet and the stamp pressing It is configured to eliminate the magnetic force acting with the magnet, and has an elastic member that returns the stamp pressing magnet to the position before the stamp and cancels the stamp operation of the stamp mechanism when the magnetic force disappears. Features.

  In the marking torque wrench of the fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the activation magnet and the stamp pressing magnet may be configured such that the operation of the toggle mechanism is released and the activation magnet is initially set. By returning to the position, the stamp pressing magnet is returned to the position before the stamp by the magnetic force acting between the activation magnet and the stamp pressing magnet, and the stamp operation of the stamp mechanism is released. It is characterized by that.

  In the marking torque wrench of the fifth aspect of the present invention, in the fourth aspect of the present invention, the activation magnet and the stamp pressing magnet are configured such that the operation of the toggle mechanism is released and the activation magnet returns to the initial position. They are arranged so that magnetic forces of different polarities act on each other to generate an attractive force.

The present invention utilizes the displacement of the ratchet, body, etc. caused by the toggle operation of the torque wrench, and uses magnetic force as a mechanism for operating the stamp.
In the present invention, when tightening of the torque wrench is completed, the arm attached to the torque wrench is displaced in conjunction with the ratchet portion due to the toggle displacement of the toggle, the swing displacement of the handle portion, etc., and the starting magnet moves accordingly. . At that time, a magnetic force acts between the pressing magnet attached to the stamp mechanism in the upper part of the stamp or the stamp pressing rod and the starting magnet attached to the lower part of the arm, etc., thereby causing the stamp mechanism to perform the stamping operation. The magnetic force acting at this time may use a repulsive force due to the same polarity, or may use any attractive force due to a different polarity. In order to obtain a simpler structure, it is desirable to perform the stamping operation so as to push the marking mechanism using the repulsive force.

  When the toggle operation of the torque wrench is released, the starting magnet returns to the initial position, and the magnet repulsive force is lost, so that the stamp can be returned to the initial position by a force such as a return spring.

  Also, by devising the magnet magnetizing method, the magnetized surface where the magnetic force acts changes from the same polarity to the opposite polarity to each other as the starting magnet moves and returns. By providing a plurality of different magnetic poles, it is possible to perform both stamp pressing and stamp releasing operations with magnetic force.

As described above, according to the marking torque wrench of the present invention, the toggle mechanism operates when the tightening force on the bolt or nut reaches a predetermined value, and the stamp mechanism operates to automatically perform marking. In a torque wrench, an activation magnet that moves in conjunction with the displacement associated with the operation of the toggle mechanism, and a stamp pressing magnet that is attached to the stamp mechanism and that acts as a result of the movement of the activation magnet. The stamp mechanism is configured such that the stamp pressing magnet is moved by the magnetic force acting between the activation magnet and the stamp pressing magnet by the movement of the activation magnet to perform a stamping operation. Therefore, the following effects can be obtained.
1. 1. Since mechanical contact parts can be reduced, failure due to wear can be avoided. Since a large stamp displacement can be obtained by the magnet repulsive force regardless of the displacement of the movable component, the components can be simplified and miniaturized.
3. Regardless of the operating force of the moving parts, a strong stamp pressing force can be obtained by the magnet repulsive force, so that the components can be simplified and miniaturized.

(Embodiment 1)
Below, the marking torque wrench of one Embodiment of this invention is demonstrated based on FIGS. 1-3.
FIG. 1 is a partial cross-sectional view showing the entire marking wrench 1, and a head member 3 is rotatably attached to the distal end side of a cylindrical torque wrench main body 2. A part of the head member 3 extends into the torque wrench body 2 and is connected to one side of a toggle mechanism 10 provided in the torque wrench body 2. The other side of the toggle mechanism 10 is connected to the torque wrench body 2 side.
When the specified torque is tightened, the toggle mechanism 10 releases the fixed state between the torque wrench main body 2 and the head member 3 by a toggle operation, and the head member 3 does not follow the tightening force applied to the torque wrench main body 2, and the head The member 3 side swings at a predetermined angle. At this time, a part of the head member 3 hits the torque wrench main body 2 and makes a sound so that the operator can know that the specified torque has been tightened. The configuration of the toggle mechanism 10 is not limited to a specific one in the present invention, and a known one can be used.

Further, a drive member 3 a is fixed to the head member 3, and an extension cylinder 4 is provided on the drive member 3 a so as to intersect the torque wrench body 2, and a bolt is attached to the tip of the extension cylinder 4. A socket 5 for fastening is provided.
A marking stamp 6 along the axial direction is disposed in the extension cylinder 4 so as to be movable in the axial direction. The leading end side of the marking stamp 6 is inserted into the socket 5 through a through hole 5 a provided in the socket 5. Protruding and stamping on the tip side is possible. A step 6a is provided at the center of the marking stamp 6, and a stamp push-back spring 7 is arranged as an elastic material between the step 6a and the step 4a provided on the extension cylinder 4. Yes. When the marking stamp 6 is in a normal position (initial position), the stamp push-back spring 7 is only subjected to its own weight such as the marking stamp 6 and is supported by elastic force, and the marking stamp 6 moves forward (downward in the figure). The stamp push-back spring 7 is compressed to generate an elastic force that pushes the marking stamp 6 back to the initial position.

  Further, on the proximal end side of the marking stamp 6, the distal end side of the stamp pressing rod 8 which is also disposed in the extension cylinder 4 along the axial direction is located. The proximal end side of the stamp pressing rod 8 is the head end side. It protrudes upward of the head member 3 through a through hole 3 b provided in the member 3. A stamp pressing magnet 9 having a magnetic pole on the surface is attached to the protruding end of the stamp pressing rod 8. A marking mechanism is constituted by the marking stamp 6 and the stamp pressing rod 8 described above.

  An extension plate 20 that extends along the longitudinal direction of the torque wrench body 2 is fixed to the head member 3 above the torque wrench body 2. An activation arm 21 disposed along the longitudinal direction of the torque wrench body 2 is located above the extension plate 20. The activation arm 21 is pivotally supported at its rear side by a pin 25 at the rear end portion of the extension plate 20. The starting arm 21 extends rearward from the shaft stopping portion and is rotatably supported by a pin 26 provided on the torque wrench body 1. These activation arms 21 and the like are covered with a cover 28 attached to the extension plate 20.

The distal end side of the activation arm 21 extends so as to reach the position of the stamp pressing rod 8 described above, and an activation magnet 22 having a magnetic pole on the surface is provided at the distal end side toward the stamp pressing magnet 9 side. It is attached.
The stamp pressing magnet 9 and the starting magnet 22 are magnetized so as to have magnetic poles on opposite sides as described above, and the magnetic poles are the same. As shown in FIG. 2, the starter arm 21 has the pin so that the starter magnet 22 is in an initial position away from the opposed position of the stamp pressing magnet 9 when the operation of the toggle mechanism 10 is released. 25 is provided at a position deviated in the width direction, and therefore the activation arm 21 is positioned with an inclination with respect to the longitudinal direction of the torque wrench body 2.

  On the other hand, when the specified torque is tightened, when the toggle mechanism 10 is operated and the head member 3 is swung, the starting arm 21 rotates by a predetermined angle around the pin 25 with the pin 26 acting as a point of action. . As a result, the distal end side where the activation magnet 22 is provided is positioned so that the activation magnet 22 faces the stamp pressing magnet 9 in the positive direction. When the toggle is released, the activation arm 21 returns to the initial position, and the activation magnet 22 and the stamp pressing magnet 9 are in a positional relationship away from the facing position where no magnetic force acts on each other. In addition, the distance to the mounting position of the pin 25 and the starting magnet 22 is made larger than the distance between the pins 25 and 26, and the moving amount by the above-mentioned swinging operation is amplified and the starting magnet 22 moves.

Next, the operation of the marking torque wrench 1 will be described.
Torque for tightening is preset in the marking torque wrench 1, and the bolt head 30 to be tightened is accommodated in the socket 5. At this time, since the toggle mechanism 10 is opened, the activation arm 21 is in the initial position, and the activation magnet 22 is located away from the position facing the stamp pressing magnet 9. For this reason, there is almost no influence of the mutual magnetic force between the two magnets, and no forces that interact with each other are generated. Further, the marking stamp 6 is supported by a stamp push-back spring 7 and is in an initial position. The stamp pressing magnet 9 protrudes upward from the head member 3, and the tip of the marking stamp 6 is also in the socket 5. Is substantially not protruding.

  When tightening is performed via the torque wrench main body 2 in the above state, the bolt head 30 is rotated by the socket 5 until the preset torque is reached. When the tightening force reaches the preset torque, the toggle mechanism 10 operates and the head member 3 swings. With this swinging motion, the activation arm 21 rotates around the pin 25 as described above, and the activation magnet 22 faces the stamp pressing magnet 9. Note that the extension plate 20 is provided with a stopper 27 that prevents the rotation of the starting arm 21 that has been rotated by contact with the extension plate 20 so that the starting arm 21 is positioned in the directly-facing position.

  Both magnets have the same magnetic pole as described above, and by facing each other, the mutual magnetic force acts to generate a repulsive force. Since the starting magnet 22 is supported by the starting arm 21, the vertical position is maintained, while the stamp pressing magnet 9 moves away from the starting magnet 22.

  As the stamp pressing magnet 9 moves, the stamp pressing rod 8 moves to advance the marking stamp 6 against the elastic force of the stamp pressing back spring 7. As the marking stamp 6 advances, the tip of the marking stamp protrudes from the through hole 5a of the socket 5, finally reaches the bolt head 30, and the bolt head 30 is stamped. When the tightening via the torque wrench body 2 is stopped, the toggle mechanism 10 is opened and the head member 3 swings back. As a result, the activation arm 21 also rotates so as to return to the initial position, and the activation magnet 22 also moves to a position away from the position facing the stamp pressing magnet 9. As a result, the magnetic force acting between the magnets disappears, and the repulsive force that moves the stamp pressing magnet 9 is lost. Then, the pressing force applied to the marking stamp 6 via the stamp pressing rod 8 is lost, and the marking stamp 6 is pushed back by the elastic force of the stamp pushing back spring 7 to return to the initial position. By the above operation, a large stroke can be given to the marking mechanism using a small displacement of the starting arm without requiring a special mechanism.

(Embodiment 2)
In the above-described embodiment, when the toggle is released, the returning operation of the marking mechanism is performed using the elastic force of the elastic material. However, by devising the magnetic pole distribution of the starting magnet and the stamp pressing magnet, the elastic material The stamp mechanism can be restored using the magnetic force of the magnet. That is, by using a magnet having different N / S poles in the radial direction, a single-sided multipole magnet, or the like and changing the positional relationship of the magnets, the repulsive force and attractive force generated can be changed. This eliminates the need for a spring or the like for returning the stamp to the original position when not operating.

This Embodiment 2 is demonstrated based on FIG. In addition, about the structure similar to the said Embodiment 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted or simplified.
In the second embodiment, a stamp pressing magnet 90 is attached to the proximal end side of the stamp pressing rod 8, and an activation magnet 220 is attached to the distal end side of the activation arm 21. The starting magnet 90 and the stamp pressing magnet 220 are partitioned and magnetized so that magnetic poles having different polarities in the moving direction (stroke direction) of the starting arm 21 are positioned in the same order. When the starting arm 21 is in the initial position, the magnetic poles having different polarities of the starting magnet 90 and the stamp pressing magnet 220 face each other, and the starting magnet 90 and the stamp pressing magnet 220 have the same polarity at the moving position during the toggle operation. The magnetic poles are partitioned so that they face each other.

  In FIG. 4, when the activation magnet 220 and the stamp pressing magnet 90 face each other, the same polarity (N poles and S poles) face each other, the toggle is released, and the activation magnet 90 returns to the initial position. In some cases, a configuration is shown in which the north and south poles face each other.

  The operation of the torque wrench will be described. When the activation arm 21 is in the initial state when the toggle is opened, as shown in FIGS. 4 and 5, one of the divided S poles of the activation magnet 220 and the stamp pressing magnet 90. The other N poles of the magnets face each other and the other magnetic poles of the magnets do not interact with each other. In the above state, the activation magnet 90 and the stamp pressing magnet 220 attract each other, and the stamp pressing magnet 90 moves toward the activation magnet 220 by the attractive force with respect to the activation magnet 220 supported by the activation arm 21. This movement is transmitted from the stamp pressing rod 8 to the marking stamp 6 connected thereto, and the marking stamp 6 is retracted and placed in the initial position.

  On the other hand, when the toggle mechanism 10 is operated by tightening a bolt head or the like, the activation arm 21 rotates, and the activation magnet 220 and the stamp pressing magnet 90 face each other. As a result, one of the S poles of the starting magnet 220 and one of the S poles of the stamp pressing magnet 90, and one of the N poles of the starting magnet 220 and one of the stamp pressing magnets 90 are divided. The N poles of each other face each other, and the magnetic force acts on each other to generate a repulsive force. Due to this repulsive force, the stamp pressing magnet 90 moves downward in the figure with respect to the starting magnet 220 fixed to the starting arm 21, and the marking stamp 6 advances through the stamp pressing rod 8 to perform the stamping operation.

  When the toggle is released, the activation arm 21 rotates as described above, an attractive force acts between the activation magnet 220 and the stamp pressing magnet 90, and the stamp pressing magnet 90 is attracted to the activation magnet 220 side. Then, the marking stamp 6 moves backward through the stamp pressing rod 8 and returns to the initial position.

(Embodiment 3)
In each of the above embodiments, the magnets that act on each other are arranged so that the opposing surfaces are substantially parallel to each other. However, if they are separated from each other, the acting magnetic force is weakened. It is possible to prevent the working distance from becoming small. In addition, about the structure similar to each said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  That is, as shown in FIG. 6, a taper-shaped activation magnet 221 is attached to the activation arm 21, or a step-shaped activation magnet 222 is attached to the activation arm 21 as shown in FIG. 7. In the starting magnet 221, the magnetized surface is inclined so that the distance from the stamp pressing magnet 221 becomes smaller as it is farther from the stamp pressing magnet 9, and the starting magnet 222 is positioned downward on the side away from the stamp pressing magnet 9. A stepped portion 222a is provided. In these starting magnets 221, 222, the starting magnets 221, 222 and the stamp pressing magnet 9 are also moved when the stamp pressing magnet 9 moves in the crossing direction by the magnetic force as the starting magnets 221, 222 move to the facing position. It is possible to obtain an effect of a strong magnetic force by reducing the expansion of the clearance. In this embodiment, the shape of the starter magnet is changed. However, the shape of the stamp pressing magnet may be changed.

(Embodiment 4)
Examples of the arrangement of the magnetic poles of the starting magnet and the stamp pressing magnet have been described in the first and second embodiments. However, in the present invention, the method of arranging the magnetic poles in the magnet is not limited to this, and various forms are conceivable. An example of this will be described with reference to FIG.

  (A) The figure is magnetized along the thickness direction of a cylindrical magnet, and magnetic poles having different polarities appear on the front and back surfaces. (B) The figure is magnetized along the surface direction, and magnetic poles having different polarities in an angular range of 180 degrees appear on the outer peripheral surface. (C) In the figure, the magnet is magnetized along the thickness direction of the cylindrical magnet, and is divided into magnetic poles having different polarities in the radial direction (both sides: 4 poles). (D) In the figure, magnets are magnetized on one side along the thickness direction of a cylindrical magnet, and magnetic poles having different polarities in the radial direction are arranged (single-sided 2-poles).

  (E) In the figure, one side of a cylindrical magnet is provided with magnetic poles having different polarities at every predetermined angle (single-sided multipole), and (f) in the figure, on the outer circumferential surface of the cylindrical magnet. Magnetic poles having different polarities at every predetermined angle are provided (peripheral multipolar). (G) The figure is a modified example of the figure (a), in which the magnet shape is formed into a ring shape. (H) The figure shows the same ring shape and is magnetized along the radial direction. Further, FIG. (I) is a modified example of FIG. (E), in which the magnet shape is a ring shape (single-sided multipolar). (J) The figure shows a magnetic pole having a different polarity for each predetermined angle on the inner peripheral surface of the ring-shaped magnet (inner peripheral multipole). (K) The figure shows the outer periphery of the ring-shaped magnet. Magnetic poles having different polarities at predetermined angles are formed on the surface (peripheral multipolar).

  (L) The figure is magnetized along the thickness direction of the prismatic magnet. (M) The figure shows that magnetic poles having different polarities in the plane direction are formed on one side of the prismatic magnet. Thus, it is magnetized in the thickness direction (single-sided multipole). (N) In the figure, a prismatic magnet is magnetized along the thickness direction so that magnetic poles having different polarities in the surface direction are alternately formed (double-sided multipole).

(Embodiment 5)
In each of the above-described embodiments, the swinging motion of the head member based on the operation of the toggle mechanism is converted into the rotation of the activation arm. At this time, since the position of the swing axis of the head member and the rotation axis of the starter arm are shifted, it is desirable that the starter arm rotate smoothly with the head member swinging operation. . This configuration will be described with reference to FIG.

  That is, between the starting arm 21 described in the first embodiment and the pins 25 and 26, the sizes of the shaft holes 21a and 21b through which the pins 25 and 26 are inserted are appropriately set, and appropriate between them. Smooth rotation can be achieved by providing a clear clearance. In addition, the clearance in the shaft hole 21b through which the pin 26 is inserted is preferably larger than the clearance (B) in the shaft hole 21a through which the pin 25 is inserted. It is desirable that the clearance (A1) along the longitudinal direction of the wrench main body 2 is made larger than the clearance (A2) in the width direction so that the shaft hole 21b has a long hole shape. Therefore, the desirable relationship of the clearance is represented by B <A2 <A1.

  The present invention has been described above based on the above embodiment. However, the present invention is not limited to the content of the above embodiment, and naturally changes can be made without departing from the scope of the present invention. Is possible.

It is a partial sectional view showing a marking torque wrench of one embodiment of the present invention. Similarly, it is a plan view. Similarly, it is a figure explaining operation | movement of a marking mechanism. It is a figure explaining operation | movement of the marking mechanism in other embodiment of this invention. Similarly, it is an enlarged view. It is a figure which shows other embodiment of this invention. It is a figure which shows other embodiment of this invention. It is a figure which shows other embodiment of this invention. It is a figure which shows the attachment state of the starting arm in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Marking torque wrench 2 Torque wrench body 6 Marking stamp 7 Stamp pushing back spring 8 Stamp pushing rod 9 Stamp pushing magnet 10 Toggle mechanism 21 Starting arm 22 Starting magnet 90 Stamp pressing magnet 220 Starting magnet 221 Starting magnet 222 Starting magnet

Claims (5)

In the torque wrench that operates automatically when the tightening force on the bolt or nut reaches a predetermined value, and the stamp mechanism operates to automatically mark,
An activation magnet that moves in conjunction with the displacement associated with the operation of the toggle mechanism;
A stamp pressing magnet that is attached to the stamp mechanism side and in which the magnetic force acts by the movement of the starter magnet;
The stamp mechanism is configured such that a stamping operation is performed by moving the stamp pressing magnet by a magnetic force acting between the starting magnet and the stamp pressing magnet by the movement of the starting magnet. Marking torque wrench.   The said starting magnet and the said stamp pressing magnet are arrange | positioned so that a repulsive force may be produced by the mutually same magnetic force acting with the movement of the said starting magnet. Marking torque wrench.   The activation magnet is configured to return to the initial position when the operation of the toggle mechanism is released, and to eliminate the magnetic force acting between the activation magnet and the stamp pressing magnet. The marking torque wrench according to claim 1 or 2, further comprising an elastic member for returning the stamp pressing magnet to a position before the stamp to release the stamping operation of the stamp mechanism.   The activation magnet and the stamp pressing magnet are configured such that the stamp pressing is performed by a magnetic force acting between the activation magnet and the stamp pressing magnet when the operation of the toggle mechanism is released and the activation magnet returns to an initial position. The marking torque wrench according to any one of claims 1 to 3, wherein the magnet is returned to a position before stamping to cancel the stamping operation of the stamp mechanism.   The starter magnet and the stamp pressing magnet are arranged so that the magnetic force of different polarities acts on each other to generate an attractive force when the operation of the toggle mechanism is released and the starter magnet returns to the initial position. The marking torque wrench according to claim 4, wherein the marking torque wrench is provided.

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