JP2015223660A - Marking torque wrench - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a marking torque wrench capable of stably executing marking to a leg of a bolt projected from a nut, by operating based on the movement of a thrust member.SOLUTION: A marking torque wrench 1 is connected to a thruster 6 on the rear end side of a stay 20 provided along an operation rod 4. The head side of this stay 20 is connected to the side of the short side 22a of an L type stay 22. The L type stay 22 can rotate by journaling a bending part 22c, and the side of the long side 22b extends so as to abut above a stamp holder 18 provided in a marking mechanism 15. The stamp holder 18 is slidably arranged to a socket 12, and is incorporated with a stamp 16 so as to project a stamp surface 16a downward. The stamp 16 is energized downward to the stamp holder 18.

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 preventing forgetting to tighten and unnecessary tightening by marking a fastening target when the specified torque is reached.

  Conventionally, various marking torque wrenches have been used in order to prevent forgetting to tighten the fastening target or unnecessary tightening for the fastening target that has already been completed. Among these, a mechanical marking mechanism is incorporated into a torque wrench that detects a specified torque by operating a toggle link between a thruster urged by a spring or the like and a head member. There is a configuration example. As an example of this, FIG. 9 shows a marking torque wrench that uses the movement of a thruster.

  In the marker built-in type torque wrench 101 of FIG. 9, the end of the rod 120 arranged along the grip tube 104 is connected to the thrust member 106 and the other end is connected to the link 122. On the other hand, a slide shaft 119 is inserted into the socket 112 that can accommodate the fastening object 50. A marking member 116 is provided in the slide shaft 119, and is configured integrally with a sleeve 118 that is slidably disposed along the outer periphery of the socket 112. The above-described link 122 is connected to the sleeve 118. With this configuration, when a predetermined torque is reached during the fastening operation and the thrust member 106 is slightly pushed out to the head member 102 side, this movement is transmitted through the rod and the link, and the sleeve is pushed down. It is done. Thereby, the marking member provided in the interior is lowered, and it is possible to mark the fastening target.

Japanese Utility Model Publication No. 2-78279

  However, in the marker built-in type torque wrench 101 as described above, the movement of the thrust member 106 when the specified torque is generated is slight. For this reason, when the fastening object 50 has a constant shape (projection height) like the head of the bolt, marking is easy, but it is difficult to mark the foot side of the bolt protruding to the nut side. It is.

  That is, in the nut fastening operation, the protruding amount of the bolt foot varies depending on the thickness or size of the fastened object. For this reason, it is necessary to transmit force so that a sufficient stroke can be obtained on the marking member 116 side, but the movement of the thrust member 106 of the driving source is slight and difficult.

  It is also difficult to obtain a necessary and sufficient stroke on the side of the marking member 116 for the feet of bolts having different protruding heights.

  Therefore, an object of the present invention is to provide a marking torque wrench that operates based on the movement of a thrust member and can stably perform marking on a foot of a bolt protruding from a nut.

  In order to achieve the above object, the marking torque wrench of the present invention is configured such that a head provided with a socket and a thruster urged from the rear end side of the operating rod are connected by a toggle link, and the thruster toward the head side of the thruster. A marking torque wrench that performs marking based on movement, a stamp for marking, a stamp holder that is slidable along the fastening axis direction of the socket, and holds the stamp with the stamp surface facing the fastening work side; , A holder urging means for urging the stamp holder away from the fastening operation side, a stamp urging means for urging the stamp in the stamp holder so that the stamp surface protrudes toward the fastening operation side, and one end of the thruster Between the other end of the stay and the stamp holder, Provided, characterized by comprising a link mechanism for converting the displacement of the head side of the thruster to the displacement of the fastening operation side of the stamp holder, a.

  In addition to the above configuration, the marking torque wrench of the present invention includes a link mechanism that is pivotally supported with the bending position as a fulcrum, a short side connected to the stay, and a long side of the stamp holder. It is characterized by comprising an L-shaped stay extending to a position in contact with the end opposite to the fastening work side.

  The marking torque wrench of the present invention, in addition to the above configuration, is a cylindrical member in which the stamp holder is formed with an opening formed on the fastening work side and a spring receiver protruding from the outer peripheral surface. The biasing means is a first coil spring that biases the spring receiver so as to be separated from the fastening work side, and the stamp has a shoulder that can be engaged with the inner peripheral edge of the opening of the stamp holder in the vicinity of the stamp surface. The stamp urging means is a second coil spring that urges the stamp toward the fastening work side.

  In addition to the above configuration, the marking torque wrench according to the present invention has a regular hexagonal housing portion formed on the fastening work side, and further can be inscribed in six faces inside the fastening work side. An outer peripheral surface is formed from the outer flat surface of each of the six curved surfaces formed so as to be continuous between the adjacent outer flat surfaces and the distance from the center is slightly larger than the distance to the outer flat surface, An ink holding member that can come into contact with the stamp surface is embedded in a recess formed at one end, and a removable resin cap is provided on the socket.

  As described above, according to the present invention, when the specified torque is reached, the stay moves to the head side along the operating rod based on the displacement of the thruster to the head side, and further, by the link mechanism connected to the stay. The stamp holder is pushed down toward the fastening work side against the bias of the stamp biasing means. As a result, the stamp surface protruding from the stamp holder toward the fastening work side is abutted against the fastening object and marked.

  At this time, since the stamp is biased toward the fastening work side, if the distance between the stamp surface and the fastening target does not match, the stamp can be retracted into the stamp holder against the stamp biasing means. The effects of differences can be absorbed.

  Further, according to the present invention, in addition to the above-described effects, the L-shaped stay used for configuring the link mechanism is connected to the stay that connects the short side to the thruster, and the long side is the fastening work side of the stamp holder. Since it is disposed so as to abut on the opposite end and is pivotally supported at the bent position, a slight movement of the thruster is amplified and reflected in the movement of the stamp holder in the fastening axis direction.

  As described above, since the stroke of the stamp holder is increased, the marking is stably performed even when the protrusion height to be fastened varies.

  According to the present invention, in addition to the above effect, the first coil spring is disposed along the outer peripheral surface of the stamp holder as the holder biasing means, and the second coil spring is employed as the stamp biasing means. Therefore, since coil springs having different winding diameters can be combined, two urging means can be provided in a space-saving manner.

Further, according to the present invention, in addition to the above-described effect, the six outer planes that can contact the inner surface of the regular hexagonal socket and the curved surfaces that connect the adjacent outer planes are alternately arranged, whereby the resin An outer peripheral surface of the cap made of metal is formed, and the curved surface is formed so as to project slightly larger on the outer diameter side than the outer flat surface. As a result, when the resin cap is inserted so that the outer flat surface is aligned with the inner surface of the socket and rotated around the fastening shaft, the curved surface is crushed and the outer peripheral surface of the cap becomes the socket with the elastic deformation of the resin. Stable by being pressed against the inner surface.
Further, since the ink holding member is embedded in the concave portion formed at one end of the resin cap, it is possible to protect the ink with the ink attached to the stamp surface simply by inserting the resin cap.

It is a side sectional view showing the internal structure of the marking torque wrench according to the embodiment of the present invention. It is sectional drawing in the planar view which showed the internal structure of the marking torque wrench of FIG. It is a whole perspective view of the marking torque wrench of FIG. FIG. 2 is an enlarged cross-sectional view of the periphery of the head in FIG. 1. 1 is an operation state of the marking torque wrench of FIG. 1, (a) shows a state where the protruding height of the bolt is relatively large, and (b) is an enlarged sectional view showing a state where the protruding height of the bolt is relatively small. It is. It is the perspective view which showed the resin-made caps of the marking torque wrench which concerns on embodiment of this invention. FIG. 7 is an enlarged cross-sectional view showing a state where the resin cap of FIG. 6 is attached to the marking torque wrench of FIG. 1. It is the enlarged view seen from the socket side about the mounting state of the resin cap of FIG. 6, (a) shows the state where the outer side plane followed the inner surface of the socket, and (b) shows the curved surface pressed against the inner surface of the socket. It is the figure which showed the state. It is sectional drawing of the conventional marker built-in type torque wrench.

  Hereinafter, a marking torque wrench according to an embodiment of the present invention will be described with reference to the drawings. The overall configuration of the marking torque wrench 1 will be described with reference to FIGS. 1 to 3, and the configuration around the head 2a of the head member 2 will be described in detail with reference to FIG. The operation will be described with reference to FIG. 6 to 8, the configuration and usage of the resin cap 30 will be described.

  FIG. 1 is a sectional view of the entire marking torque wrench 1 as seen from the side so that the internal structure becomes clear. FIG. 2 shows the marking torque wrench 1 of FIG. 1 in plan view. 2, as in FIG. 1, the whole is shown in a sectional view so that the internal structure is clear.

  With reference to FIGS. 1 and 2, in the marking torque wrench 1 according to the present embodiment, an urging spring 8 is provided on the rear end side. The thruster 6 is biased toward the head by the biasing spring 8. The thruster 6 is connected to the head shaft 2b of the head member 2 via the toggle link 10, and transmits the urging force to the head 2 side. With this configuration, when the specified torque is reached in the fastening operation, the thruster 6 is pushed back toward the rear end side against the biasing force of the biasing spring 8.

  In the present embodiment, the rear end portion of the stay 20 disposed along the operation rod 4 is connected to the thruster 6. As is apparent from FIG. 2, the stay 20 is connected to the thruster 6 by the same connecting shaft 21 together with the toggle 10a. A long hole is formed in the upper surface of the operation rod 4 so that the connecting shaft 21 can follow the movement of the thruster 6.

  The end of the stay 20 on the head 2 a side is connected to the short side 22 a side of the L-type stay 22. The L-shaped stay 22 is pivotally supported by a bent portion 22c so as to be rotatable. To see this pivot structure, reference is made to FIG. FIG. 3 shows an overall perspective view of the marking torque wrench 1. In FIG. 3, an exploded view with the cover 23 protecting the L-type stay 22 removed is shown by a solid line, and the mounted state is shown by a virtual line. As can be seen from FIG. 3, the bent portion 22 c of the L-shaped stay 22 is pivotally supported so as to be sandwiched between the two columns 25.

  The long side 22b of the L-shaped stay 22 extends toward the head 2a, and the tip thereof reaches the marking mechanism 15. The marking torque wrench 1 according to the present embodiment is provided with a marking mechanism 15 above a socket 12 that accommodates bolts 51 and nuts 52 (to be described later) to be fastened. The outside of the marking mechanism 15 is surrounded by a cylindrical cover body 17. Referring to FIG. 1, a stamp holder 18 is provided inside the cover body 17 so as to be slidable in the fastening axis A direction.

  Here, FIG. 4 is referred to in order to show the detailed configuration of the marking mechanism 15. 4 is an enlarged cross-sectional view of the periphery of the head 2a of the marking torque wrench 1. FIG. As described above, the stamp holder 18 provided above the socket 12 is provided to be slidable along the inside of the socket 12. A spring receiver 18 c is provided above the outer periphery of the stamp holder 18, and a coil spring 26 (first coil spring) is disposed between the spring receiver 18 c and the upper end of the socket 12. The stamp spring 18 is biased upward (in the direction of the fastening shaft in the direction away from the housing portion) by the coil spring 26 and is lifted upward of the socket 12.

  Inside the stamp holder 18, the stamp 16 is arranged with the stamp surface 16a facing downward. As can be seen from FIG. 4, an opening 18b is formed below (on the fastening work side) of the stamp holder 18, and the stamp surface 16a of the stamp 16 is arranged so as to protrude downward from this opening. A shoulder portion 16b having a diameter larger than the opening portion 18b of the stamp holder 18 is formed in the vicinity of the stamp surface 16a so that it can be caught in the stamp holder 18. A coil spring 28 smaller than the coil spring 26 is also disposed above the stamp 16. The upper portion of the stamp holder 18 is closed by a holder spiral 18d so as to compress the coil spring 28. For this reason, the stamp 16 is in a state of being biased toward the fastening work side of the socket 12. Thus, the coil spring 26 is provided as a stamp holder biasing means, and the coil spring 28 is provided as a stamp biasing means.

  The cylindrical cover body 17 is open on the rear end side, and is invaded so that the end of the long side 22b of the L-shaped stay 22 contacts.

  Since it is configured as described above, when the fastening torque becomes greater than or equal to a specified value in the fastening operation, the stay 20 is pulled to the rear end side by the thruster 6, and at the same time, the short side 22 a side of the L-type stay 22 is also It is pulled to the rear end side. As a result, a force that pushes down the holder spiral 18 d acts on the long side 22 b of the L-shaped stay 22. Subsequently, this operation will be described with reference to FIG.

  In FIG. 5, two operating states by the marking torque wrench 1 are compared. FIG. 5 (a) shows an operation state for a relatively long foot of the bolt 51, and FIG. 5 (b) shows an operation state for a relatively short foot of the bolt 51. Yes. As can be seen from FIG. 5A, when the foot of the bolt 51 is relatively long, the stamp surface 16 a comes into contact with the back side of the socket 12. However, the rotation angle of the L-type stay 22 is always constant because it is based on the moving distance of the thruster 6 (see FIG. 1). In this case, the coil spring 28 is greatly contracted to correspond to the bolt 51 having a long foot. On the other hand, in the state shown in FIG. 5B, since the foot of the bolt 51 is not as long as the state of FIG. 5A, the stamp surface 16a is in contact with the foot of the bolt 51 slightly below. For this reason, the coil width 28a shown in FIG. 5B is larger than the coil width 28a of the coil spring 28 shown in FIG. Note that the coil width 26a of the coil spring 26 disposed on the outer periphery of the stamp holder 18 is less affected by external force than the small coil spring 28, so there is almost no difference between the states.

  In this manner, in the marking torque wrench 1 according to the present embodiment, the difference in the protruding height of the bolt 51 can be absorbed by the coil spring 28, so that the member to be fastened that is sandwiched between the bolt 51 and the nut 52. Regardless of the thickness or size, it is possible to always perform the marking operation stably.

  Next, FIG. 6 shows a resin cap 30 that can cover the accommodating portion of the socket 12 of the marking torque wrench 1 according to the present embodiment. As shown in FIG. 6, the resin cap 30 has six outer flat surfaces 30a formed on the outer peripheral surface. The resin cap 30 is formed in such a size that it can come into contact with the inner peripheral surface of the socket 12 with six outer flat surfaces 30a. A curved surface 30b is formed between the adjacent outer flat surfaces 30a. As described above, the resin cap 30 is configured such that the six outer flat surfaces 30a and the six curved surfaces 30b are alternately combined to form an outer peripheral surface. In FIG. 6, the boundary between the outer flat surface 30a and the curved surface 30b is indicated by a one-dot chain line so that these configurations become clear. As is clear from FIG. 6, a recess 30c is formed at one end of the resin cap 30, and an ink holding member 32 is provided in the recess 30c. Next, a state in which the resin cap 30 is attached to the socket 12 is shown in FIG.

  As shown in FIG. 7, the recess 30c of the resin cap 30 is formed to have substantially the same diameter as the stamp surface 16a. Therefore, when the resin cap 30 is inserted into the socket 12, the stamp 16 is inserted into the recess 30c. The stamp surface 16a side is inserted. At this time, since the stamp surface 16a contacts the ink holding member 32 in the recess 30c, ink is applied to the stamp surface 16a. Thereby, it is possible to protect the stamp surface 16a and to prevent the stamp surface 16a from drying.

  Next, FIG. 8 shows a mounting state of the resin cap 30 as viewed from the housing side of the socket 12. FIG. 8A shows a state in which the outer flat surface 30 a of the resin cap 30 is in contact with the inner surface of the socket 12. On the other hand, FIG. 8B shows a state in which the curved surface 30 b of the resin cap 30 is pressed against the inner surface of the socket 12.

  In FIG. 8, in order to clarify the arrangement of the resin cap 30 inserted into the socket 12, the specific curved surface 30 b and the center are shown connected by a one-dot chain line. According to this, when changing from the state of FIG. 8A to the state of FIG. 8B, the resin cap 30 is rotated 30 degrees around the fastening shaft (see FIG. 3). Since the resin cap 30 according to the present embodiment is formed so as to protrude in the radial direction from the outer flat surface 30a as described above, after the outer flat surface 30a is inserted along the inner surface of the socket 12, When rotated around the fastening axis, the curved surface 30b can be pressed against the inner surface of the socket 12 with the elastic deformation of the resin, and the resin cap 30 can be stably held in the socket 12. In FIG. 8B, pressure is applied from the curved surface 30b to six locations indicated by arrows.

  In the above-described embodiment, the configuration using the coil spring as the holder urging unit and the stamp urging unit is shown as an example. However, the present invention is not limited to this, and other elastic members such as leaf springs may be employed as the urging means.

  Moreover, in the said embodiment, the structure using one L type stay was shown as an example as a link mechanism which transmits motive power from a stay to a stamp holder. However, the present invention is not limited to this, and a link made up of a plurality of members may be used as long as the power from the stay can be amplified and the stroke of the stamp holder can be sufficiently earned.

  In the above embodiment, the configuration including the ratchet mechanism is illustrated. However, a torque wrench that does not include the ratchet mechanism may be used.

  Further, in the above embodiment, as an example of the curved surface forming the outer peripheral surface of the resin cap, an example is shown in which the outer surface is formed with a smooth curved surface that is convex in the outer diameter direction and has no inflection point. It may have a plurality of inflection points such as a corrugated shape as long as it has a shape protruding to the outer diameter side from the plane. Furthermore, it does not need to have a uniform shape in the longitudinal direction. The same effect can be obtained as long as at least a portion protruding to the outer diameter side from the outer plane is formed in the region inserted into the socket.

DESCRIPTION OF SYMBOLS 1 Marking torque wrench 2 Head member 2a Head 2b Head axis | shaft 4 Operation rod 4a Long hole 6 Thruster 8 Energizing spring 10 Toggle link 10a Toggle 12 Socket 12a Housing part 12b Ratchet tooth 14 Switching part 14a Ratchet claw 15 Marking mechanism 16 Stamp 16a Stamp Surface 16b Shoulder portion 17 Cover body 18 Stamp holder 18a Outer peripheral surface 18b Opening portion 18c Spring receiver 18d Holder spiral 20 Stay 21 Connecting shaft 22 L-type stay (link mechanism)
22a short side 22b long side 22c bent part 23 cover 24 fulcrum (link mechanism)
25 Strut 26 Coil spring (first coil spring, holder biasing means)
26a Coil width 28 Coil spring (second coil spring, stamp urging means)
28a Coil width 30 Resin cap 30a Outer plane 30b Curved surface 30c Recess 32 Ink holding member 51 Bolt (fastening target)
52 Nut (Target for fastening)

Claims (4)

A marking torque wrench that is connected with a toggle link between a head provided with a socket and a thruster urged from the rear end side of the operating rod, and performs marking based on movement of the thruster toward the head side,
A marking stamp,
A stamp holder provided so as to be slidable along a fastening axis direction of the socket, and holding the stamp with a stamp surface facing a fastening work side;
Holder urging means for urging the stamp holder in a direction away from the fastening work side;
Stamp urging means for urging the stamp in the stamp holder so that the stamp surface protrudes toward the fastening work side;
A stay connected at one end to the thruster and arranged along the operating rod;
A link mechanism provided between the other end of the stay extending to the head side and the stamp holder, and converting a displacement of the thruster toward the head side into a displacement toward the fastening work side of the stamp holder;
A marking torque wrench characterized by comprising   The link mechanism is pivotally supported with a bending position as a fulcrum, has a short side connected to the stay, and a long side that contacts the end of the stamp holder opposite to the fastening work side. The marking torque wrench according to claim 1, wherein the marking torque wrench is configured by an L-shaped stay extending to a contact position. The stamp holder is a cylindrical member in which an opening is formed on the fastening work side and a spring receiver protrudes from the outer peripheral surface.
The holder urging means is a first coil spring that urges the spring receiver to separate from the fastening work side,
In the stamp, a shoulder that can be engaged with the inner peripheral edge of the opening of the stamp holder protrudes in the vicinity of the stamp surface,
The marking torque wrench according to claim 1 or 2, wherein the stamp urging means is a second coil spring that urges the stamp toward the fastening work side. The socket has a regular hexagonal accommodating portion formed on the fastening work side,
Further, the distance from the center that is continuous between the six outer planes that can be inscribed in the six inner surfaces on the fastening work side and the adjacent outer plane is slightly larger than the distance to the outer plane. An outer peripheral surface is formed from the six curved surfaces formed as described above, and an ink holding member that can be in contact with the stamp surface is embedded in a recess formed at one end, so that the socket is made of resin. With a cap,
The marking torque wrench according to any one of claims 1 to 3, wherein the marking torque wrench is provided.