JPH0720267U - Torque Wrench - Google Patents

Abstract

(57) [Summary] [Purpose] Improvement of the torque wrench incorporating the tightening completion switch. [Structure] A magnet is fixed to a head portion of a torque wrench, and a reed switch corresponding to the magnet is fixed to a handle portion of the torque wrench. [Effect] Durability and operational reliability are improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a torque wrench equipped with a screw tightening completion detection switch, which outputs a signal when the screw tightening torque value of a torque wrench reaches a predetermined value to control the number of tightened screws. .

[0002]

[Prior art]

 Even when the tightening torque of assembly screws is adequately managed during the assembly work of a mechanism that is assembled with a large number of bolts, nuts, etc., if there is a screw that has been forgotten to tighten, it will be meaningless at all. become.

The presence of a forget-to-tighten screw, especially in a complicated structure such as an engine, is an important problem that causes a defective product.

In order to solve this problem, for example, as disclosed in Japanese Patent Publication No. 50-32149, a micro that interlocks with a torque bar that operates each time a screw to be tightened is completed with a constant torque value. The present applicant has already developed a torque wrench which is equipped with a switch in a torque wrench so that the number of screws tightened by the torque wrench can be controlled by the operation signal of the micro switch. .

[0005]

[Problems to be solved by the device]

 However, in such a known torque wrench, the detection means for detecting the tightening number provided in the torque wrench is a micro switch, and therefore the micro switch repeats mechanical operation. Moreover, the micro switch had a problem of low durability because it had a contact structure with the torque bar.

[0006]

[Means for Solving the Problems]

 The present invention has been made in view of such a conventional problem, and adopts a lead switch that operates in non-contact with the torque wrench as a tightening number detection switch in the torque wrench, and is structurally durable and reliable. To provide an excellent torque wrench.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

Reference numeral 1 denotes a tubular handle portion of a torque wrench. Inside the handle portion 1, a head 3 pivotally supported by a support shaft 2 attached to a tip end portion of the handle portion 1 and a handle portion 1 are provided. It has a slider 5 that is pressed toward the tip of the handle 1 by a spring 4 that is housed inside the tail end of the handle, and a toggle link 6 that connects the slider 5 and the head 3 to each other. There is.

Reference numeral 7 is a magnet fixed to the upper side of the head 3 via a mounting base 8. The magnet 7 is exposed to the outside of the handle portion through a through-hole window 9 provided in the handle portion 1. Is configured.

Reference numeral 10 denotes a switch base made of a non-magnetic material. On the switch base 10, a substrate 12 in which a lead switch 11 is molded is mounted, and the reed switch 11 is mounted at the magnet 7 position. Are positioned at the corresponding positions.

As described above, in this embodiment, the magnet 7 is fixed to the head 3 of the torque wrench, the reed switch 11 is fixed to the handle portion 1, and the head 3 generated when the screw tightening by the torque wrench is completed. Since the reed switch 11 is operated by a magnet operation interlocked with the operation, and the screw tightening completion signal can be output by the operation of the reed switch, according to this embodiment, the screw tightening is performed. The completion signal can be detected by the operation of the reed switch which is a non-contact operation with the head 3 of the torque wrench.

Therefore, since the tightening number detection switch can be operated without contact, the durability of the switch operation mechanism is remarkably improved, and the operation reliability is also improved accordingly.

[0013]

[Effect of device]

 As described above, according to the present invention, in the torque wrench including the toggle link 6, the magnet 7 is fixed to the head portion 3 to which the toggle link 6 is connected, and the handle portion 1 that axially supports the head portion, Since it is a torque wrench to which the reed switch 11 corresponding to the magnet 7 is fixed, according to this, the tightening number detection switch can be operated without mechanical contact, and the durability of the switch operation mechanism is significantly improved. As a result, the effect that the operation reliability is also improved is obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view of a main structure of a torque wrench according to the present invention.

FIG. 2 is a sectional view of a main part of a torque wrench according to the present invention.

FIG. 3 is an explanatory view of members of a torque wrench according to the present invention.

FIG. 4 is an operation explanatory view of the torque wrench according to the present invention.

[Explanation of symbols]

 1 ... Handle part 2 ... Spindle 3 ... Head 4 ... Spring 5 ... Slider 6 ... Toggle link 7 ... Magnet 8 ... Mounting base 9 ... Through hole window 10 ... Switch base 11 ... Reed switch 12 ... Board

Claims (1)

[Scope of utility model registration request] 1. A torque wrench containing a toggle link (6), wherein a magnet (7) is fixed to a head portion (3) to which the toggle link (6) is connected, and a handle for axially supporting the head portion. A torque wrench characterized in that a reed switch (11) corresponding to the magnet (7) is fixed to the portion (1).