JP2009154259A - Socket mounting structure of torque wrench with marking function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To mount a general purpose socket without impairing a marking function in a torque wrench with the marking function. <P>SOLUTION: In a cylindrical socket mounting part (square tube part 4a) with a built-in stamp mechanism (a marking stamp 6), an engaging hole 4c communicable with a through-hole 5c provided to pass through a mounting port (a tube hole 5a) from an outer peripheral surface of the socket 5 mounted in the socket mounting part and having a smaller diameter than that of the through-hole 5c is formed. A stepped engaging pin 10 is provided to have a large diameter part inserting into the through-hole 5c and a small diameter part inserting into the engaging hole 4c and to have the large diameter part having a cross sectional shape which is not capable of inserting into the engaging hole 4c and the small diameter part having a length which does not reach a marking mechanism. Alternatively, a ring-shaped belt mounted on an outer periphery and an engaging pin which has one end fixed to the ring-shaped belt, is inserted into the engaging hole 4c from the through-hole 5c and has a front end which does not reach the marking mechanism are provided. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a socket mounting structure for a torque wrench with a marking function in which a stamp mechanism operates to automatically perform marking when a tightening force on a bolt or nut reaches a predetermined value.

In production lines of engines, vehicles, etc., there are many cases where marking is performed after completion of bolt tightening with a torque wrench as a measure to prevent bolt tightening in the assembly process. Recently, a torque wrench with a marking function that can automatically perform marking when tightening is completed has been proposed (see, for example, Patent Document 1).
A commercially available torque wrench mechanism with a marking function, as shown in FIG. 5, when the bolt tightening torque is reached, the displacement of the swing of the head 23 due to the operation of the toggle mechanism 21 provided in the torque wrench body 20. The marking stamp unit 30 is moved up and down via the mechanical link mechanism 24 to perform the stamping operation on the bolt 50 and the like. The link mechanism 24 is provided in the upper part of the torque wrench body 20, and the marking stamp part 30 is accommodated in the extension 25. A cylindrical adapter 26 is connected to the extension 25, and a socket 27 for tightening bolts and nuts is fitted to the cylindrical adapter 26.

  By the way, the torque wrench with marking function is surely marked after tightening, it is small and does not interfere with other parts, it is lightweight and does not cause fatigue to the operator even for long-time use, wear It is required that the socket, which is a product, be easily replaced and the socket unit price is low. However, in the torque wrench with a marking function disclosed in Patent Document 1, the marking mechanism passes through the center of the socket, and a special special socket is required for its size and shape. Dedicated sockets are expensive (distribution volume, complexity of shape), and increase production costs in mass production processes that are handled as consumables. In addition, since the socket itself becomes large, there is a problem that interference with adjacent parts occurs when tightening.

  The ability to use a commercially available product (small and inexpensive) in general is very advantageous in that the socket unit price is low, and a torque wrench with a marking function capable of using a commercially available socket is desired. If the socket is easily exchanged, it will easily drop off from the mounting part, so a general torque wrench provides a ball plunger on the outer surface of the mounting part and a recess on the inner surface of the mounting port of the socket. The ball plunger is accommodated in the recess to prevent the socket from falling off.

In addition, through holes are formed along the radial direction in some commercially available sockets, and through holes are similarly provided on the mounting portion side, and the sockets are dropped by inserting pins through the respective through holes. There is also a thing which prevents (for example, patent document 2).
JP-A-6-297352 Japanese Utility Model Publication No. 4-35876

  However, since the torque wrench with marking function has a built-in stamp mechanism in the mounting part, it is necessary to provide a ball plunger on the mounting part side in order to use a commercially available socket because of space constraints and strength. It is practically difficult, and it is difficult to adopt a drop prevention measure by inserting the pin because the pin and the stamp mechanism interfere with each other, making it difficult to use a commercially available socket.

  The present invention has been made against the background of the above circumstances, and it is intended to prevent the socket from falling off by using the through-hole of the socket without damaging the stamp mechanism even with respect to the mounting portion incorporating the stamp mechanism. Therefore, it is an object of the present invention to provide a socket mounting structure for a torque wrench with a marking function that makes it possible to use a small and inexpensive commercially available socket.

  That is, of the socket mounting structure of the torque wrench with marking function according to the present invention, the first aspect of the present invention is that the marking mechanism operates automatically when the tightening force to the bolt or nut reaches a predetermined value. In the socket mounting structure of a torque wrench with marking function, the cylindrical socket mounting portion having the stamp mechanism built therein is provided so as to penetrate from the outer peripheral surface of the socket mounted on the socket mounting portion to the mounting opening. An engagement hole having a smaller diameter than the through hole is formed, and further includes a large diameter portion inserted into the through hole and a small diameter portion inserted into the engagement hole. The large-diameter portion has a cross-sectional shape that cannot be inserted into the engagement hole, and the small-diameter portion has a stepped engagement pin whose length does not reach the marking mechanism.

  According to the first aspect of the present invention, the large-diameter portion of the engagement pin is not inserted into the engagement hole when the stepped engagement pin is passed through the socket through hole and the engagement hole of the mounting portion. By being regulated by the outer wall of the mounting part, the engagement pin does not move further inward, and the length of the small diameter part does not reach the stamp mechanism, so the stamp with the stepped engagement pin Without damaging the mechanism, the socket and the mounting portion are securely engaged to prevent the socket from falling off.

  According to a second aspect of the present invention, there is provided a socket mounting structure for a torque wrench with marking function according to the first aspect of the present invention, wherein the large-diameter portion has a length shorter than the through hole. An O-ring is mounted on the outer peripheral side of the large diameter portion.

  According to the second aspect of the present invention, the O-ring prevents the stepped engagement pin from falling off to the outer peripheral side.

  The socket mounting structure of the torque wrench with marking function according to the third aspect of the present invention is a torque wrench with marking function that automatically performs marking by operating a stamp mechanism when a tightening force to a bolt or nut reaches a predetermined value. In the socket mounting structure, the cylindrical socket mounting portion in which the stamp mechanism is built can communicate with a through hole provided so as to penetrate from the outer peripheral surface of the socket mounted on the socket mounting portion to the mounting port. An engagement hole is formed, a ring-shaped belt mounted on the outer periphery of the socket, and one end is fixed to the ring-shaped belt and inserted from the through hole to the engagement hole, and the tip reaches the marking mechanism. It is characterized by having an engagement pin with no length.

  According to the third aspect of the present invention, when the engagement pin is held by the ring-shaped belt, and the engagement pin is inserted into the through hole of the socket and the engagement hole of the mounting portion, the ring-shaped belt is By being mounted on the surface, the engagement pin is prevented from moving further inward, and the engagement pin is prevented from dropping to the outer peripheral side. Further, since the engagement pins are integrated with the ring-shaped belt, replacement work and the like are facilitated, and loss of the engagement pins is prevented. The ring belt or O-ring is preferably made of a material such as rubber having appropriate stretchability. Further, the stepped engagement pin and the engagement pin are preferably made of metal so that the engagement is ensured.

  As described above, according to the present invention, the stepped engagement pin that does not reach the stamp mechanism or the engagement pin is restricted from moving inward to the through hole of the socket and the engagement hole of the mounting portion. The socket can be securely inserted into the mounting portion and prevented from falling off without being damaged by the stamp mechanism. As a result, in the torque wrench with a marking function, it is possible to use a small and inexpensive commercial socket.

(Embodiment 1)
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a partial cross-sectional view in which a part of a torque wrench 1 with a marking function having the mounting structure of the embodiment is omitted, and a head 3 is rotatably attached to a distal end side of a cylindrical torque wrench main body 2. ing. A part of the head 3 extends into the torque wrench body 2 and is connected to one side of a toggle mechanism (not shown) provided in the torque wrench body 2, and the other side of the toggle mechanism is connected to the torque wrench body 2 side.
In the toggle mechanism, when the specified torque is tightened, the torque wrench body 2 side and the head 3 side are unfixed by the toggle operation, and the head 3 does not follow the tightening force applied to the torque wrench body 2, and the torque wrench body 2 On the other hand, the head 3 side relatively swings at a predetermined angle. The configuration of the toggle mechanism is not limited to a specific one in the present invention, and a known one can be used.

  A drive part 3a is fixed to the head 3, and an extension cylinder 4 is attached to the drive part 3a so as to intersect the torque wrench main body 2, and a square cylinder part 4a at the tip thereof will be described later. A cylindrical socket 5 is attached. Therefore, the square tube portion 4a at the tip of the extension tube 4 corresponds to a mounting portion for mounting the socket.

  A marking stamp body 6 along the axial direction is disposed in the extension cylinder 4 so as to be movable in the axial direction as a stamp mechanism. A small-diameter stamp portion 6a on the tip side of the marking stamp body 6 is a socket. It is possible to project into the socket opening 5b of the socket 5 through the five cylindrical holes 5a. A stamp push-back spring 7 is disposed between a step provided in the center of the marking stamp main body 6 and a step provided in the extension cylinder 4. When the marking stamp body 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 body 6 and is supported by elastic force, and the marking stamp body 6 moves forward ( When the stamp push-back spring 7 is compressed, an elastic force is generated to push the marking stamp body 6 back to the initial position. The main part of the marking stamp body 6 can be constituted by an ink cartridge containing ink.

  Further, a resin-made stamp cap portion 6b is provided on the base end side (upper end side in the drawing) of the marking stamp body 6, and the axial direction is also formed in the extension cylinder 4 on the stamp cap portion 6b. A stamp pressing rod 8 disposed along the tip end side of the stamp pressing rod 8 is located and connected, and the base end side of the stamp pressing rod 8 protrudes upward from the drive portion 3a and is linked to the operation of the toggle mechanism (illustrated Is not driven). In addition, the mechanism interlock | cooperated with operation | movement of a toggle mechanism is not specifically limited as this invention, It can comprise by a link mechanism etc.

Further, as described above, the bolt tightening socket 5 is attached to the square tube portion 4a at the tip of the extension tube 4 through the tube hole 5a. Therefore, the cylindrical hole 5a of the socket 5 corresponds to the mounting opening of the present invention.
Two engagement holes 4c, 4c are formed in the square tube portion 4a at intervals of 180 degrees along the radial direction, and the socket 5 attached to the square tube portion 4a is in the attached state in the engagement state. Through holes 5c and 5c communicating with the joint holes 4c and 4c are formed from the outer peripheral wall to the cylindrical hole 5a which is a mounting opening. The engagement holes 4c and 4c have a smaller diameter than the through holes 5c and 5c.

  A stepped engagement pin 10 is inserted through the through hole 5c and the engagement hole 4c. The stepped engagement pin 10 includes a large-diameter portion 10a inserted through the through hole 5c and a small-diameter portion 10b inserted through the engagement hole 4c. The large-diameter portion 10a cannot be inserted into the engagement hole 4c. , That is, a cross-sectional shape that cannot be inserted. As a result, the stepped engagement pin 10 is restricted from moving further inward by the front end of the large-diameter portion 10a hitting the rectangular tube portion 4a. The small-diameter portion 10b is shorter than the through hole 5c, and has a length that does not reach the marking stamp body 6 (including the stamp portion 6a) built in the extension cylinder 4. On the other hand, the large-diameter portion 10a is shorter than the through-hole 5c, and on the outer peripheral side of the large-diameter portion 10a, an O-ring 11 is attached to the through-hole 5c to prevent the stepped engagement pin 10 from falling off. Yes.

Next, the operation of the torque wrench 1 with a marking function will be described.
A torque for tightening is preset in the marking torque wrench 1, and a bolt head 15 to be tightened is accommodated in the socket 5. At this time, since the toggle mechanism is opened, the stamp pressing rod 8 is in the initial position without being lowered. Further, the marking stamp body 6 is supported by a stamp pushing back spring 7 and is in an initial position.

  When tightening is performed via the torque wrench body 2 in the above state, the bolt head 15 is rotated by the socket 5 until a preset torque is reached. When the tightening force reaches the preset torque, the toggle mechanism operates and the head 3 swings. With this swinging operation, the stamp pressing rod 8 is pushed downward, and the marking stamp body 6 is advanced against the elastic force of the stamp pushing back spring 7. By the advancement of the marking stamp main body 6, the stamp portion 6a protrudes from the cylindrical hole 5a of the socket 5 to the socket opening 5b, finally reaches the bolt head 15 and the bolt head 15 is stamped. At this time, the stepped engagement pin 10 is located in the engagement hole 4 c and does not interfere with the marking stamp body 6.

When the tightening via the torque wrench body 2 is stopped, the toggle mechanism is released and the head 3 swings back. As a result, the pressing force applied to the marking stamp main body 6 via the stamp pressing rod 8 is eliminated, and the marking stamp main body 6 is pushed back (reversed) by the elastic force of the stamp pushing back spring 7 to return to the initial position. . Also at this time, the stepped engagement pin 10 does not interfere with the marking stamp body 6.
With the above operation, the marking mechanism can be reliably marked by applying a large stroke to the marking mechanism using a small displacement of the starting arm without requiring a special mechanism. It is definitely prevented.
When it is necessary to remove the socket 5, the socket 5 can be easily removed from the rectangular tube portion 4a by removing the O-ring 11 from the through hole 5c and extracting it from the engagement hole 4c and the through hole 5c. When attaching the socket 5 again or when attaching a new socket 5, after mounting the socket 5 to the rectangular tube portion 4a via the tube hole 5a, the stepped engagement pin 10 is inserted through the through hole 5c and the engagement hole 4c. By inserting and mounting the O-ring 11 on the outer peripheral side, the socket can be easily mounted.

(Embodiment 2)
In the first embodiment, the socket is prevented from falling off by the stepped engagement pin. However, it is also possible to prevent the socket from falling off by using a straight engagement pin. The embodiment will be described below with reference to FIGS. In addition, about the structure similar to the said Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.
In this embodiment, a rubber ring-shaped belt 13 mounted on the outer periphery of the through-hole 5c of the socket 5 is provided, and the ring-shaped belt 13 has a width larger than the diameter of the through-hole 5c. Engagement pins 12 along the radial direction are integrated with the inner surface of the ring-shaped belt 13.

  The engagement pin 12 can be embedded in a belt material in a mold at the time of manufacturing the ring-shaped belt 13 and integrated by heating and pressurization. At this time, in order to ensure the coupling between the ring-shaped belt 13 and the engagement pin 12, an uneven shape, for example, a circumferential groove 12a is formed on the engagement pin 12 as shown in FIG. The contact area can be increased and the connectivity can be improved.

The engagement pin 12 is inserted into the through hole 5c and the engagement hole 4c, and the ring belt 13 is attached to the outer peripheral surface of the socket 5 so as to cover the through hole 5c. In this mounting, the tip of the engagement pin 12 is accommodated in the engagement hole 4c and does not reach the marking stamp body 6 including the marking portion 6a. In this embodiment, one engagement hole 4c is formed in the square tube portion 4a along the radial direction in accordance with the number of engagement pins 12.
Also in this embodiment, the engaging pin 12 does not interfere with the stamp portion 6a which is a part of the marking mechanism during the marking operation, and the marking operation is smoothly performed in a state in which the socket 5 is prevented from falling off.

  Further, since the ring-shaped belt 13 and the engagement pin 12 are integrated, the handling is easy. Further, the engagement pin 12 alone is easy to be lost, but since the engagement pin 12 is integrated with the ring-shaped belt 13, there is an advantage that it is difficult to lose. In the above embodiment, the ring-shaped belt 13 is integrated with one engagement pin 12. However, the two engagement pins 12 are integrated with the ring-shaped belt 13. May be. In that case, two engagement holes 4c and 4c are formed in the rectangular tube portion 4a in accordance with the number of the engagement pins 12.

  Although the present invention has been described based on the above embodiment, the present invention is not limited to the content of the above embodiment, and can be appropriately changed without departing from the present invention. .

It is the partial cross section figure which abbreviate | omitted a part of the torque wrench with a marking function which has the mounting structure of one Embodiment of this invention. Similarly, it is a partially enlarged view showing the mounting structure. It is a partially expanded view which shows the mounting structure of other embodiment of this invention. Similarly, it is the top view and partial expanded sectional view which show the ring-shaped belt and engagement pin which were integrated. It is a figure which shows the conventional torque wrench with a marking function.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Torque wrench with a marking function 2 Torque wrench main body 3 Head 3a Drive part 4 Extension cylinder 4a Square cylinder part 4c Engagement hole 5 Socket 5c Through hole 10 Stepped engagement pin 10a Large diameter part 10b Small diameter part 11 O ring 12 Engagement Pin 13 Ring-shaped belt

Claims (3)

In the socket mounting structure of a torque wrench with marking function that automatically performs marking when the clamping force on the bolt or nut reaches a predetermined value,
The cylindrical socket mounting portion in which the stamp mechanism is built can communicate with a through hole provided so as to penetrate from the outer peripheral surface of the socket mounted in the socket mounting portion to the mounting port, and has a smaller diameter than the through hole. A large-diameter portion that is inserted through the through-hole and a small-diameter portion that is inserted through the engagement hole, and the large-diameter portion cannot be inserted into the engagement hole. A mounting structure for a torque wrench socket with a marking function, characterized in that it has a stepped engagement pin having a cross-sectional shape of which the length of the small diameter portion does not reach the marking mechanism.   The marking function according to claim 1, wherein the large-diameter portion has a length shorter than the through-hole, and an O-ring is attached to the large-diameter portion outer peripheral side of the engagement pin in the through-hole. Torque wrench socket mounting structure. In the socket mounting structure of a torque wrench with marking function that automatically performs marking when the clamping force on the bolt or nut reaches a predetermined value,
The cylindrical socket mounting portion having the stamp mechanism built therein is formed with an engagement hole that can communicate with a through hole provided so as to penetrate from the outer peripheral surface of the socket mounted in the socket mounting portion to the mounting port. A ring-shaped belt mounted on the outer periphery of the socket, and an engagement with a length that does not reach the marking mechanism with one end fixed to the ring-shaped belt and inserted from the through hole to the engagement hole Socket mounting structure of torque wrench with marking function, characterized by having a pin.

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