JP6818352B2 - Marking torque wrench - Google Patents

Description

The present invention relates to a torque wrench capable of confirming a specified torque, and more particularly to a marking torque wrench capable of marking a fastening target to prevent forgetting to tighten and unnecessary retightening when the specified torque is reached.

Conventionally, various types of marking torque wrenches have been used in order to prevent forgetting to tighten the fastening target and unnecessary retightening of the fastening target for which work has already been completed. Of these, a mechanical marking mechanism is adopted for the torque wrench in which a toggle link is interposed between the thruster urged by a spring or the like and the head member, and the specified torque is detected by the operation of the toggle link. There is an example. As an example of this, FIG. 7 shows a marking torque wrench that utilizes the movement of a thruster.

In the marker built-in type torque wrench 101 of FIG. 7, the end portion of the rod 120 arranged along the grip tube 104 is connected to the thrust member 106, and the other end side is connected to the link 122. On the other hand, a slide shaft 119 is inserted and arranged in the socket 112 capable of accommodating the fastening target 50. A marking member 116 is provided in the slide shaft 119, and is integrally formed with a sleeve 118 slidably arranged along the outer circumference of the socket 112. The link 122 described above is connected to the sleeve 118. With this configuration, when the specified torque is reached during the fastening work and the thrust member 106 is slightly pushed toward the head member 102, this movement is transmitted via the rod 120 and the link 122, and the sleeve. 118 is pushed down. As a result, the internal marking member 116 is lowered, and the fastening target 50 can be marked.

Patent Document 1 describes such a torque wrench 101 with a built-in marker.

Jikkenhei 2-78269 Gazette

However, in the torque wrench 101 with a built-in marker as described above, at least a space for the marking member 116 and a space for the marking member 116 to be raised and lowered are required in the axial direction of the bolt to be fastened 50. If a link mechanism for raising and lowering the marking member 116 is included in this, it must be designed so as to project greatly in the axial direction.

With such a configuration, for example, when bolting to the inside of channel steel or the like, there is a problem that the size of the fastening direction exceeds the channel width due to the addition of the marking mechanism, and the tool cannot be inserted. Occurs.

Further, when it is necessary to make markings on the nut side instead of the head side of the bolt, the length of the foot of the bolt protruding from the nut is not constant. For this reason, it is necessary to solve the problem that was not necessary in the configuration of marking the head side of the bolt, such as the need to set the stroke of the marking member to be larger in order to correspond to various bolt lengths. ..

Therefore, it is an object of the present invention to provide a marking torque wrench capable of marking the nut side and suppressing the height of the bolt in the axial direction at least around the head.

In order to achieve the above object, in the marking torque wrench of the present invention, the rear end side of the head portion pivotally supported on the tip end side of the operating lever is connected to the thruster urged to the head portion side by a toggle link. A marking torque wrench that makes markings based on the displacement of the thruster to the rear end side when the specified torque is reached, and stamps from the rear end side of the screw fitting portion toward the screw fitting portion of the head portion. The stamp portion is arranged so as to face the surface and is slidably held in the longitudinal direction of the operating lever, and is pivotally supported so as to be swingable in the longitudinal direction, and the swing end is on the rear end side of the stamp portion. a lever connected to, and the oscillating end across the pivot point of the front Symbol lever one end connected to the coupling end on the lever opposite to integrally rotatably directly the other end against the thrusters It is characterized by having a connected stay.

Further, in addition to the above configuration, the marking torque wrench of the present invention is characterized in that the swinging end of the lever is connected to the rear end side of the stamp portion via a first spring.

Further, in the marking torque wrench of the present invention, in addition to the above configuration, the second spring having a smaller spring constant than the first spring urges the stamp portion toward the rear end side with respect to the operating stick. , It is characterized in that it is provided between the operation stick side and the stamp portion.

Further, in the marking torque wrench of the present invention, in addition to the above configuration, the stamp portion has a holder in which an opening for accommodating a removable stamp body is formed toward the head portion side, and slides with the operation rod side. The operation rod has a sliding contact portion extending from the holder so as to be contactable, and the operating rod has a sliding contact guide portion that guides the sliding contact portion so as to be relatively slidable, and is independent of the sliding contact portion. the as can slide relative to said held together in the sliding guide portion and the sliding contact portion, characterized by comprising the stamp body and capable of accommodating cover the holder from the rear end side.

As described above, according to the present invention, the movement of the thruster is converted into the sliding movement of the stamp portion in the longitudinal direction through the movement of the lever that swings in the longitudinal direction, so that the protrusion length of the screw is increased. Marking can be performed from the radial direction of the screw shaft regardless of the variation.

Further, according to the present invention, in addition to the above effect, the first spring interposed between the stamp portion and the lever causes a time delay in the movement transmitted from the swing end of the lever to the stamp portion. As a result, a sufficient time can be provided until the stamp portion, which swings relative to the head portion, stops moving, so that the marking operation can be performed in a stable state.

Further, according to the present invention, in addition to the above effect, since the second spring urges the stamp portion toward the rear end side, the rear end side of the stamp portion is always in contact with the first spring. As a result, the force transmitted from the first spring can be transmitted toward the rear end side of the stamp portion without causing loss.

Further, according to the present invention, in addition to the above effects, the cover body capable of accommodating the stamp body including the stamp surface and the holder from the rear end side is slid so as to be slidable relative to the stamp portion. Since it is held by the contact guide portion, the stamp surface can be protected when not in use, and the operation of the stamp body and the holder is not hindered when in use.

It is an overall perspective view of the marking torque wrench which concerns on embodiment of this invention. It is the whole perspective view which showed by the partial breakage of the marking torque wrench of FIG. The internal structure of the area around the head of the marking torque wrench shown in FIG. 1 is shown by a partial breakage. (A) is a state in which no load is applied to the head, and (b) is the moment when the specified torque is reached and the lever rotates. A transient state in the middle of movement, (c) is a front view showing a state in which the rotation of the lever is completed. The periphery of the head portion of the marking torque wrench of FIG. 1 is shown, (a) is a plan view showing a state in which no load is applied to the head portion, and (b) is a plan view showing a tightening completed state in which a specified torque is reached. It is a schematic diagram which shows the operation about the modification 1 of the marking torque wrench of FIG. It is an overall perspective view which showed the modification 2 of the marking torque wrench of FIG. It is sectional drawing of the conventional torque wrench with a built-in marker.

Hereinafter, the marking torque wrench according to the present invention will be described with reference to the drawings.

First, the outer shape will be described with reference to FIG. FIG. 1 is an overall perspective view of a marking torque wrench 1 according to an embodiment of the present invention. As will be described in detail later, the marking torque wrench 1 is provided with a mechanical marking mechanism as opposed to a general preset type torque wrench having a built-in toggle link.

A head portion 4 having a ratchet mechanism at one end of a tubular operating rod 2 is pivotally supported by a rotating shaft 6. Hereinafter, for convenience of explanation, the head portion 4 side will be referred to as the front end side, and the operation stick 2 side will be referred to as the rear end side. Further, when it is called the longitudinal direction, it means the direction in which the operation stick 2 extends.

A stamp portion 12 is arranged above the head portion 4 in parallel with the longitudinal direction of the operating rod 2. Since the stamp portion 12 is covered with the cover body 16, it does not appear in this figure. The cover body 16 is fixed to the guide cylinder 20 described later by a set screw 16a. By loosening the set screw 16a and sliding the cover body 16 with respect to the guide cylinder 20, the inner stamp portion 12 can be exposed for maintenance.

Next, the internal structure of the marking torque wrench 1 will be described with reference to FIG. FIG. 2 is an overall perspective view showing a partial breakage of the marking torque wrench of FIG.

A toggle 10 is arranged at substantially the center of the operating rod 2 in the longitudinal direction. The toggle 10 constitutes a toggle link that connects the shaft end portion 4b extending from the head portion 4 on the front end side via the rotation shaft 6 and the thruster 8 on the rear end side. A spring 9 for urging the thruster 8 toward the head portion 4 is provided on the rear end side of the thruster 8.

On the other hand, the stamp body 14 is built in the stamp portion 12. In the state shown in FIG. 1, the slump portion 12 and the stamp body 14 are hidden by a cap 17 attached to the tip end side of the cover body 16. A lever 22 for sliding the stamp portion 12 in the longitudinal direction is pivotally supported by the support portion 18 on the rear end side of the cover body 16 and the stamp portion 12. A stay 24 for swinging the lever 22 is provided on the rear end side of the support portion 18. The rear end side of the stay 24 is connected to the above-mentioned thruster 8 by a connecting pin 11.

The connecting pin 11 is arranged so as to penetrate the operating rod 2 in the orthogonal direction, and is set so as to be movable along an elongated hole 2a formed through the operating rod 2 at a position facing each other in the radial direction.

The stay 24 is arranged so that the long side 24a is along the operating rod 2, and the short side 24b is formed in a substantially L shape so as to extend in the radial direction of the operating rod 2. The short side 24b of the stay 24 is connected to the connecting end 22b on the side opposite to the lower swinging end 22a via the shaft fulcrum 18a of the lever 22. That is, when the swinging end 22a is regarded as the point of action and the connecting end 22b is regarded as the point of effort, the so-called first-class lever is arranged so that the shaft fulcrum 18a is lined up between the swinging end 22a and the connecting end 22b.

With this configuration, when the specified torque is reached, the toggle 10 operates, and when the thruster 8 moves toward the rear end side against the urging of the spring 9, the stay 24 connected by the connecting pin 11 Is integrated with the thruster 8 and pulled toward the rear end side. Then, the connecting end 22b of the lever 22 is pulled toward the rear end side by the short side 24b of the stay 24 pulled toward the rear end side, so that the lower swinging end 22a swings toward the tip end side along the longitudinal direction.

The shaft fulcrum 18a of the lever 22 is supported by a support portion 18 provided on the tip end side of the operating rod 2. The support portion 18 is fixed to the operating rod 2 by a set screw 19.

Next, the internal structure of the stamp portion 12 will be described. Inside the stamp portion 12, a replaceable stamp body 14 is held in the holder 12a. The stamp body 14 is arranged along the extending direction of the operating rod 2 so that the stamp surface 14a faces the hexagonal screw fitting portion 4a of the head portion 4 from the rear end side.

A slide shaft 12b (sliding contact portion) extends from the rear end side of the holder 12a of the stamp portion 12. A guide cylinder 20 (sliding contact guide portion) is provided on the tip end side of the support portion 18, and the slide shaft 12b of the stamp portion 12 projects a part of the rear end side into the support portion 18. Therefore, it is arranged so as to be slidable inside the guide cylinder 20.

The portion of the support portion 18 surrounded by the alternate long and short dash line is extracted and shown as a partially enlarged view at the lower part of the drawing. With reference to this partially enlarged view, a spring 30 (second spring) is provided around the rear end side of the slide shaft 12b. One end of the spring 30 is in contact with the rear end side of the guide cylinder 20, and the other end is in contact with the back side of the head of the spring stopper 21 fastened to the shaft end of the slide shaft 12b. Due to the elastic force of the spring 30 in the extension direction, the stamp portion 12 including the holder 12a and the slide shaft 12b is urged toward the rear end side with respect to the support portion 18 integrally formed with the operating rod 2 side. ..

A spring 28 (first spring) is arranged between the spring stopper 21 and the swing end 22a of the lever 22. A spring 28 having a spring constant larger than that of the spring 30 is used. Therefore, when a force is applied from the rear end side by the swing end 22a of the lever 22, the spring 30 side contracts more than the spring 28.

Next, the operation of the marking mechanism including the stamp portion 12 and the lever 22 will be described with reference to FIG.

FIG. 3 is a front view showing the internal structure of the periphery of the head portion 4 of the marking torque wrench 1 due to partial breakage. FIG. 3A shows a state in which no load is applied to the head portion 4, FIG. 3B shows a transient state in which the lever 22 is in the middle of rotation at the moment when the specified torque is reached, and FIG. 3C shows rotation of the lever 22. Indicates the completed state. Here, the usage state in which the cap 17 shown in FIG. 1 is removed from the cover body 16 is shown.

First, with reference to FIG. 3A, the nut 50b fitted to the screw fitting portion 4a of the head portion 4 is shown by a dotted line. The bolt 50a fastened to the nut 50b projects upward. Since the protruding length of the bolt 50a is not constant, for example, when a stamp mechanism is provided in the vertical direction along the axis of the bolt 50a in order to mark the protruding end side, it is possible to cope with different protruding lengths. A structure that can take a large stroke is required. Therefore, when a nut is fastened to a bolt protruding inside a channel steel having a narrow channel width, the walls at opposite positions interfere with each other and the head cannot be inserted inward.

On the other hand, in the marking torque wrench 1 according to the present embodiment, the stamp portion 12 is arranged so as to be able to move forward and backward along the operation stick 2 instead of the fastening direction. As a result, the overhang in the fastening direction is suppressed, so that the head portion 4 can be easily inserted into the channel steel.

FIG. 3A shows a no-load state in which no rotational power is applied to the head portion 4, so that the stay 24 does not exert a force on the lever 22 and the lever 22 stands upright. ing. In order to show the extending direction of the lever 22, the alternate long and short dash line along the lever 22 is superimposed on the shaft fulcrum 18a.

The upper part of the lever 22 is substantially linear, but the lower side is formed so as to be inclined toward the rear end side. Due to such a shape, the swing center is close to directly below the shaft fulcrum 18a, so that the spring 28 can be expanded and contracted along the substantially longitudinal direction of the operating rod 2 without the action of scooping up the rear end side of the spring 28. It is possible.

In the configuration according to the present embodiment, the shape in which the lower part of the lever 22 is bent linearly toward the rear end side is shown as an example, but as described above, the swing center is in the vicinity of the shaft fulcrum 18a. The shape between the shaft fulcrum 18a and the swing end 22a is not limited as long as the configuration can be set to. At least, the swing end 22a may be offset toward the rear end side from the shaft fulcrum 18a in the no-load state.

In this way, the swing end 22a of the lever 22 can smoothly push the slide shaft 12b by applying a constant force along the substantially longitudinal direction, so that the loss due to friction that hinders the operation of the toggle link is reduced. It is possible to do.

Regarding the stamp body 14 built in the cover body 16, the stamp surface 14a is located inside the opening position of the cover body 16 in the no-load state as shown in FIG. 3A. Therefore, when the head portion 4 is fitted to the nut 50b, it is possible to prevent an erroneous operation such as contacting the stamp surface 14a with the bolt 50a.

Next, refer to FIG. 3 (b). Here, the state at the moment when the stay 24 is pulled toward the rear end side by the thruster 8 (see FIG. 2) by the detection of the specified torque and the lever 22 starts swinging is shown. In reality, the operation of the toggle link when the specified torque is reached is completed instantly, but it is shown for convenience to explain the transient operation.

Similar to FIG. 3A, the alternate long and short dash line along the lever 22 is superimposed on the shaft fulcrum 18a to show the extending direction of the lever 22. In FIG. 3B, the portion above the shaft fulcrum 18a is slightly tilted toward the rear end side as compared with that in FIG. 3A. The short alternate long and short dash lines A and B represent the movable limit angles on the front end side and the rear end side of the lever 22, respectively.

Here, paying attention to the relationship between the stamp surface 14a and the opening position of the cover body 16, the stamp surface 14a is slightly closer to the opening position of the cover body 16 than the positional relationship shown in FIG. 3A. It is still located inside the cover body 16. That is, since the inertial force of the stamp portion 12, the frictional force between the slide shaft 12b and the guide cylinder 20, and the elastic force of the spring 30 act as drag forces, the movement of the lever 22 is not directly transmitted, and the lever Even if 22 starts swinging, a short time is generated so that the stamp surface 14a stays in the cover body 16. The effects obtained from this feature will be described later.

Then, refer to FIG. 3 (c). Here, a state in which the swing end 22a of the lever 22 swings toward the front end side is shown by pulling the stay 24 toward the rear end side with the displacement of the thruster 8 toward the rear end side. Due to the repulsive force of the spring 28 pushed into the swing end 22a in this way, the stamp portion 12 slides toward the tip side, and the stamp surface 14a of the stamp body 14 protrudes from the cover body 16 and comes into contact with the side surface of the bolt 50a. There is. In this way, the marking operation is completed.

Next, the operation shown in FIG. 3 will be described from a different viewpoint. FIG. 4 is a plan view showing the periphery of the head portion 4 of the marking torque wrench 1. FIG. 4A shows a state in which no load is applied to the head portion 4, and FIG. 4B shows a fastening completed state in which the specified torque is reached. That is, FIG. 4 (a) represents the state of FIG. 3 (a), and FIG. 4 (b) represents the state of FIG. 3 (c). Here, the alternate long and short dash line along the operating rod 2 is superimposed on the rotating shaft 6 so that the rotational position of the operating rod 2 with respect to the position of the head portion 4 can be easily understood.

With reference to FIG. 4A, in the no-load state, the stamp body 14 is housed in the cover body 16 and the stamp surface 14a is the bolt 50a, as described with reference to FIG. 3A. Away from. In FIG. 4A, the toggle 10 is pushed toward the shaft end portion 4b side of the head portion 4 by the thruster 8 (see FIG. 2), so that the head portion 4 is in the extending direction of the operation stick 2. It is in a state of being slightly tilted upward in the figure.

On the other hand, referring to FIG. 4 (b), the operating rod 2 rotates relative to the head portion 4 around the rotation axis 6 due to the toggle 10 extending in the longitudinal direction (see also FIG. 2). doing. That is, the head portion 4 has shifted to a state of being tilted downward in the drawing with respect to the extending direction of the operating rod 2. Further, the stamp portion 12 is pushed out toward the tip end side so that the stamp surface 14a is in contact with the bolt 50a.

As can be seen from the above change from FIG. 4A to FIG. 4B, in the marking torque wrench 1, the tip end side of the stamp portion 12 is pushed out while rotating so as to cross the vicinity of the bolt 50a with the fastening operation. ..

Recalling the states of FIGS. 3 (b) and 3 (c), when the stay 24 is pulled toward the rear end side by the thruster 8, the stamp surface 14a protrudes from the cover body 16 at the same time as the lever 22 swings. (The state of FIG. 3B), the cover body 16 protruded with a slight time difference from the completion of fastening (the state of FIG. 3C).

That is, the marking torque wrench 1 according to the present embodiment does not protrude from the cover body 16 at the stage where the stamp portion 12 is rotating relative to the head portion 4, and the fastening operation is completely completed. The stamp surface 14a comes into contact with the bolt 50a in a state where the stamp portion 12 is substantially stopped relative to the head portion 4. As a result, the event that the stamp surface 14a is rubbed against the thread of the bolt 50a is avoided, so that the stamp surface 14a can be prevented from being worn. Further, unnecessary damage due to a force acting on the slide shaft 12b from a direction other than the slide direction is prevented, and deterioration of the slide mechanism of the stamp portion 12 can be suppressed.

(Modification example 1)
Next, a modification 1 of the marking torque wrench 1 will be described with reference to FIG.

FIG. 5 is a partially enlarged view of the configuration of the rear end side of the stamp portion 12, and schematically shows the swing end 22a of the slide shaft 12b, the spring stopper 21, the spring 28, the spring 30, and the lever 22. ing. The difference between this modification 1 and the marking torque wrench 1 described above is that it does not have a structure that regulates the movement of the slide shaft 12b toward the tip side other than the spring 30.

To explain this regulatory structure, reference is made again to FIGS. 2 and 3 (c).

As can be seen in the enlarged view of the part surrounded by the alternate long and short dash line in FIG. 2, the inner diameter of the through hole in which the slide shaft 12b is arranged is reduced by one step by the shoulder structure 18b on the tip side. ing. The shoulder structure 18b is formed so as to project in the diameter reduction direction so that the head of the spring stopper 21 at the rear end of the slide shaft 12b can be engaged. Therefore, the movement of the slide shaft 12b is restricted from the position where the spring stopper 21 abuts on the shoulder structure 18b toward the tip end side.

In the marking torque wrench 1, as shown in FIG. 3C, there is a slight gap between the spring stopper 21 and the shoulder structure 18b when the stamp surface 14a at the completion of fastening is in contact with the bolt 50a. Is configured to be formed. That is, at the fastening completion position, the elastic force of the spring 28 acts on the bolt 50a via the stamp surface 14a.

Therefore, the stamp surface 14a can be pressed against the bolt 50a with a necessary and sufficient force, and a buffering action is generated by receiving the force acting on the stamp surface 14a from the bolt 50a side by the elastic force of the spring 28. It is configured in.

Returning to the description of FIG. 5, in the first modification, the movable range of the slide shaft 12b is large because it does not have a configuration like the shoulder structure 18b of FIG. 2 that comes into contact with the spring stopper 21. As a result, a motion similar to the coupled vibration due to the combination of the spring 28 and the spring 30 as shown below is likely to occur.

5A shows a no-load state in which no fastening force is applied, FIG. 5B shows a state immediately after the fastening is completed, FIG. 5C shows a state in which the slide shaft 12b is pushed out with a time delay, and FIG. 5D shows a spring 28. And the spring 30 are balanced, and the slide shaft 12b is in a stable state. The position P1 indicated by the alternate long and short dash line in the figure indicates the position on the rear end side of the spring 28 before reaching the specified torque. The position P2 is the position on the rear end side of the spring 28 when the fastening is completed. Further, the position P3 is the position on the rear end side of the spring 30 before reaching the specified torque, and the position P4 is the position on the rear end side when the spring 30 is most compressed. Further, the position P5 indicates the position on the rear end side of the spring 30 when it is in a stable state after the fastening is completed.

The operation will be described step by step from FIGS. 5A to 5D.

In FIG. 5A, the moment when the spring 28 is compressed from the position P1 by the swinging end 22a of the lever 22 to reach the state of FIG. 5B is similar to that of FIG. 3B. This is the state before the energy stored in the spring 28 is released to the slide shaft 12b side. The force that releases the spring 28 pushes the slide shaft 12b toward the tip, and the rear end of the spring 30 reaches position P4. Then, as the spring 28 whose energy is released contracts, a pushing force acts from the spring 30, and the rear end side of the spring 30 stabilizes at the position P5 slightly closer to the tip side than the initial position P3.

When the slide shaft 12b does not have a structure for restricting the movement toward the tip end side as in the first modification, vibrations as shown in FIGS. 5A to 5D occur with the fastening operation. That is, if the slide shaft 12b is configured to be able to vibrate freely, the spring 30 can be contracted to the position P4 on the tip side of the stable position P5 in FIG. 5 (d). In other words, position P4
This means that the stroke of the slide shaft 12b can be earned by the distance D between the position and the position P5. With this configuration, it is possible to stably mark bolts having different diameters.

(Modification 2)
Next, the marking torque wrench 51, which is a modification 2 of the marking torque wrench 1, will be described with reference to FIG. Here, the same configuration as the marking torque wrench 1 will be described with the same reference numerals.

The marking torque wrench 51 shown in FIG. 6 is different from the marking torque wrench 1 in that the axial direction of the shaft fulcrum 52a of the support portion 52 that supports the lever 22 is arranged parallel to the fastening direction. Therefore, the stay 53 has a long side 53a arranged along the operating rod 2 and a short side 53b extending in a direction orthogonal to the fastening direction. The configuration inside the support portion 52 is the same as that of the marking torque wrench 1. With such a configuration, the overhang in the fastening direction can be further suppressed, which is more advantageous than the marking torque wrench 1 in a situation where the fastening direction is narrow.

The configuration of the above embodiment is an example of the present invention, and further includes the following modifications.

In the above embodiment, a configuration in which the spring 28 is interposed between the swing end 22a of the lever 22 and the slide shaft 12b of the stamp portion 12 is shown as an example. However, the structure may be such that the swing end 22a and the slide shaft 12b are connected so as to be relatively rotatable without the intervention of the spring 28.

Further, in the above-described embodiment, the lever 22 is formed by inclining the lower side (swinging end 22a) toward the rear end side as an example. However, the shape of the lever 22 may be a linear shape or a curved shape as long as it satisfies the positional relationship of the first-class lever arranged in the order of the swing end 22a, the shaft fulcrum 18a, and the connecting end 22b.

Further, in the above embodiment, the configuration in which the stay 24 is formed in an L shape is shown as an example. However, the configuration is not limited to the L type as long as the displacement of the thruster 8 can be transmitted to the lever 22.

Further, in the above embodiment, a configuration in which a spring 30 is provided between the guide cylinder 20 and the slide shaft 12b in order to urge the stamp portion 12 toward the rear end side is shown as an example. However, if the swing end 22a or the spring 28 and the slide shaft 12b can be connected so that the thruster 8 can be integrated with the lever 22 and pulled back to the rear end side together with the return operation of the thruster 8, the spring urging toward the rear end side. 30 is not an essential configuration.

Further, in the above embodiment, a configuration in which a tubular cover body 16 is provided so as to cover the stamp portion 12 is shown as an example. However, the cover body 16 may not be formed in a tubular shape as long as it can prevent interference between the stamp portion 12 (particularly, the stamp surface 14a) and the bolt 50a at the time of installation.

In the marking torque wrench of the present invention, since the stamp portion is slidably arranged along the operating rod, it is possible to make markings on the foot side of a bolt whose length is not constant. In particular, since it can be designed to be compact with respect to the fastening direction, it is useful for work such as inside channel steel where the work space in the fastening direction is insufficient.

1, 51 Marking torque wrench 2 Operation rod 2a Long hole 4 Head part 4a Screw fitting part 4b Shaft end part 6 Rotating shaft 8 Thruster 9 Spring 10 Toggle 11 Connecting pin 12 Stamp part 12a Holder 12b Slide shaft (sliding contact part)
14 Stamp body 14a Stamp surface 16 Cover body 16a Set screw 17 Cap 18, 52 Support part 18a, 52a Shaft fulcrum 18b Shoulder structure 19 Set screw 20 Guide tube (sliding contact guide part)
21 Spring stop 22 Lever 22a Swing end 22b Connecting end 24, 53 Stay 24a, 53a Long side 24b, 53b Short side 28 Spring (first spring)
30 spring (second spring)
50 Fastening target 50a Bolt 50b Nut D Distance P1, P2, P3, P4, P5 Position

Claims (4)

The rear end side of the head portion axially supported on the tip end side of the operating rod is connected to the thruster urged to the head portion side by a toggle link, and is based on the displacement of the thruster toward the rear end side when the specified torque is reached. It is a marking torque wrench that makes markings.
A stamp portion that is arranged so as to face the stamp surface from the rear end side of the screw fitting portion toward the screw fitting portion of the head portion and is held so as to be slidable in the longitudinal direction of the operation stick.
A lever that is pivotally supported so as to be swingable in the longitudinal direction and whose swing end is connected to the rear end side of the stamp portion .
Across the pivot point of the front Symbol lever, wherein the oscillating end one end connected to the coupling end on the lever opposite to a stay coupled integrally rotatably directly with the other end against the said thrusters A marking torque wrench characterized by being equipped. The marking torque wrench according to claim 1, wherein the swinging end of the lever is connected to the rear end side of the stamp portion via a first spring. A second spring having a smaller spring constant than the first spring is provided between the operating rod side and the stamp portion so as to urge the stamp portion toward the rear end side with respect to the operating rod. The marking torque wrench according to claim 1 or 2, wherein the marking torque wrench is provided. The stamp portion has a holder in which an opening for accommodating a removable stamp body is formed toward the head portion side, and a sliding contact portion extending from the holder so as to be slidable with the operating rod side. And
The operation stick has a sliding contact guide portion that guides the sliding contact portion so as to be relatively slidable.
Wherein to allow relative sliding movement independently of the sliding contact portion, said sliding contact portion are both held in the sliding guide portion, provided with a housing capable cover the stamp member and the holder from the rear end side The marking torque wrench according to any one of claims 1 to 3, wherein the marking torque wrench is characterized.