JP3273022B2 - Torque Wrench - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque wrench used for fastening a screw or the like, and more particularly, to a display body projecting from the torque wrench when the fastening torque reaches a predetermined set value during a screw fastening operation. The present invention relates to a torque wrench provided so as to visually confirm completion of screw fastening.

[0002]

2. Description of the Related Art A general configuration of a conventional torque wrench used to fasten a screw to be fastened at a predetermined set torque value includes a head member of the torque wrench and a handle member which supports the head member. A toggle link mechanism is interposed therebetween, and when the fastening torque of the screw to be fastened reaches a predetermined fastening torque, the toggle link mechanism operates to generate an operation impact sound (click), and this operation impact sound is generated. The fastening operator knows that the fastening screw has been fastened at the set torque value of the torque wrench.

In a relatively quiet environment where the screw fastening work site using the torque wrench has little noise, the fastening worker can easily detect the operation impact sound of the toggle link mechanism. At work sites where the ambient noise is severe, such as when the work site is screwing railroad rails to piles, it is often difficult to check the operation impact sound of the toggle link mechanism. There has been a problem that excessive fastening torque force easily causes bolt breakage and loosening due to depression of the seat surface.

[0004] Therefore, during the fastening operation of the screw using the torque wrench, the present applicant has a switch interlocked with the operation of the toggle link mechanism built in the torque wrench and a display of the fastening information (alarm) activated by the function of the switch. Various applications have already been filed concerning a screw fastening confirmation system that includes means and can electrically and visually confirm the fastening status of a screw to be fastened.

[0005]

However, in such a screw fastening confirmation system and the like, a power supply is required because the mechanical operation of the toggle link mechanism must be converted into an electrical operation. Therefore, it is difficult to supply a power, particularly at an outdoor screw fastening site, and it has been impossible to use the screw fastening confirmation system using the power as described above.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and when a predetermined set torque value is reached during the fastening operation of a screw to be fastened using a torque wrench, the torque wrench of the torque wrench is interlocked with the operation of a toggle link mechanism. On the outside, a torque wrench is provided with a display body that is mechanically projected without using electric energy such as a commercial power supply and a battery,
When the fastening torque of the screw to be fastened by the torque wrench reaches the set torque value, the display body protrudes by a mechanical operation, and with the protrusion of the display body, the fastening operator fastens the fastening force of the screw at the set torque value. The purpose is to develop a torque wrench that allows the user to visually confirm the fact.

[0007]

In order to achieve the above object, according to a first aspect of the present invention, there is provided a head member rotatably supported on a handle member of a torque wrench via a head pin. in a torque wrench having a toggle link mechanism which is interposed between the thrusters it is displaceably supported in the axial direction inside the tail and the handle member of the head member, liftable outside of the torque wrench handle member such because Shi was equipped with a visual indicator, the visual indicator includes a display body standing upright projecting to the outer surface of the handle member by the restoring force of the related vital spring operation of the toggle link of the torque wrench, of the spring The head member has a restraining link for restraining a restoring force and restraining the display body from standing up, and the head member is related to an operation of the head member accompanying an operation of the toggle link mechanism at the time of fastening the screw to be fastened. Provided actuating pin for rotating the suppression link, in operation of the toggle link mechanism, restoring deterrent of the spring is released, is a torque wrench allowed to standing from the handle member outer surface of the torque wrench the display body It is characterized by:

[0008] According to a second aspect of the present invention, in addition to the first aspect, the display is a torque wrench formed of a light-emitting body such as a light collector or a light storage.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the drawings.

In this embodiment, as shown in FIG. 1, a torque wrench having a visual indicator 2 attached to a torque wrench main body 1 is constituted by a well-known preset type torque wrench. Since it does not substantially change, its outline will be described. Reference numeral 3 denotes a cylindrical handle member.
A head member 4, a part of which is housed inside the handle member 3, is pivotally supported by a head pin 5 at the front end of the handle member 3. Further, a thruster 6 is accommodated inside the handle member 3 so as to be movable in the axial direction of the handle member 3.

The thruster 6 and the head member 4 are connected by a toggle link 7, and the thruster 6 is connected to a spring 8 provided inside the handle member 3.
Is pressed in the direction of the head member 4. Reference numeral 9 denotes an adjusting screw for adjusting a compressive load for pressing the spring 8 in the direction of the thruster 6, and reference numeral 10 denotes an operating pin implanted and supported by the head member 4.

The above is the configuration of the torque wrench main body.
Next, the structure of the visual indicator mounted and maintained on the handle member 3 of the torque wrench body 1 will be described.

Reference numeral 11 denotes a substrate of the visual indicator 2. On the upper surface of the substrate 11, a column 12 which stands upright with respect to the upper surface is fixed, and has a substantially U-shaped side surface. The spring receiving frame 13 is fixed by mounting screws 14. The spring support frame 13 has the support 1
A support shaft 15 having a horizontal shaft center in a direction orthogonal to the second shaft center direction is mounted, and a coil spring 16 is wound and supported on the support shaft 15.

One end of the coil spring 16 has a three-dimensional display 17 mounted on the tip of an extension 16A extending away from the support shaft 15, and the other end 16B of the coil spring 16 has a spring receiver. It is locked to the frame 13.
Reference numeral 18 denotes a restraining link formed in a substantially L-shape in a plane. The center of the restraining link is rotatably supported by a support 12 standing on a substrate 11. Is formed in a U-shaped notch 19 in which the upper end of the operating pin 10 is locked.

The other end 18B of the restraining link 18 is formed as a spring holding portion for pushing down the extension 16A of the coil spring 16 against its elastic force.

Reference numeral 20 denotes a cover of the visual indicator 2. The cover 20 has an extension 16A of the coil spring 16 provided thereon.
In addition, an opening 21 for allowing the display 17 to protrude and retract from the outside and inside of the cover 20 is formed.

The operation of the present embodiment has been described above. Next, the operation will be described. The tightening operation of the screw to be fastened is performed by using the torque wrench main body 1 provided with the visual display 2. When a predetermined tightening torque value is reached, the toggle link 7 operates, and the head member 4 rotates about the head pin 5 in the handle member 3 in the counterclockwise direction in FIG. The rotation of the head member 4 is transmitted to the restraining link 18 in the visual indicator 2 via the operating pin 10, and the restraining link 18 rotates counterclockwise about the support 12 in FIG.

By turning the restraining link 18 counterclockwise in this manner (see FIG. 5), the pressing force of the coil spring extension 16A by the other end 18B of the restraining link 18 is released. The coil spring extension 16
A is the elastic restoring force of itself, and jumps up as shown in FIG. 6, so that the display body 17 attached to the tip of the coil spring extension 16A and the cover 2 together with the coil spring extension 16A.
The cover 20 protrudes from the opening 21 provided outside the cover 20 to the outside. Therefore, the screw fastening operator can visually confirm that the fastening force of the screw to be fastened by the torque wrench main body 1 has reached a predetermined torque value by visually observing the projecting state of the display body 17 to the outside of the cover.

[0019] In a torque wrench of the present embodiment, in which was allowed comprising a visual indicator display member in relation to the operation of the toggle link is protruded displayed in mechanical operation to the outside of the torque wrench body 1 Therefore, even if the operation sound or the impact sound of the toggle link mechanism in the torque wrench is lost during the screw fastening operation, the screw to be fastened is already fastened with the predetermined fastening torque value by the projecting action of the display body 17. This can be easily and reliably visually confirmed.

If the display 17 is formed of a light collector or a light accumulator that collects external light, the projecting state of the display can be easily checked even at the work site of screw fastening in a dark place such as at night. can do.

[0021]

According to the torque wrench of the present invention as described above, according to the present invention, the screw tightening torque reaches a set torque value of the torque wrench, the display body <br/> standing movements than the handle member the outer surface of the torque wrench Therefore, the screw tightening worker can visually and very easily and surely confirm the protruding state of the upright display body while performing the screw tightening operation. Therefore, even in the case of a screw tightening work site or the like where the operation sound of the toggle link or the impact sound is difficult to confirm, the screw is tightened at a predetermined set torque value by visually observing the state of protrusion of the display body. It is possible to know the situation of whether or not it is extremely easy and surely, whereby it is possible to prevent a fastening accident (miss) due to excessive torque fastening of the fastened screw or insufficient fastening torque.

According to the torque wrench of the present invention,
Since the upright projecting operation by the display body is performed by a mechanical operation related to the operation of the toggle link, there is no need to use a power supply such as a commercial power supply or a battery, and therefore, work in which power supply is difficult or impossible. It can be used effectively on site. Further, according to the torque wrench according to the second aspect of the present invention, even at the work site in a dark place such as at night, it is possible to reliably visually confirm the completion of the fastening of the screw to be fastened by the projecting operation of the display body. .

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of a torque wrench according to the present invention.

FIG. 2 is a partially cutaway plan view showing a toggle link operation of the torque wrench.

FIG. 3 is a plan view of a visual display according to the present invention.

FIG. 4 is a side view of the visual display of the present invention.

FIG. 5 is an operation explanatory plan view of the visual display device according to the present invention.

FIG. 6 is a side view for explaining the operation of the visual display of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Torque wrench main body 2 ... Visual display 3 ... Handle member 4 ... Head member 5 ... Head pin 6 ... Thruster 7 ... Toggle link 8 ... Spring 9 ... Adjustment screw 10 ... Operating pin 11 ... Substrate 12 ... Strut 13 ... Spring receiving frame DESCRIPTION OF SYMBOLS 14 ... Mounting screw 15 ... Support shaft 16 ... Coil spring 17 ... Display body 18 ... Suppression link 19 ... Notch 20 ... Cover 21 ... Opening

Continuation of the front page (56) References JP-A-52-49126 (JP, A) JP-A-58-44640 (JP, A) JP-A-63-19479 (JP, A) JP-A-9-308757 (JP, A) , A) Special Table 7-500540 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B25B 23/14 B25B 23/143

Claims (2)

(57) [Claims] A head member rotatably supported by a handle member of a torque wrench via a head pin, and a tail end of the head member and an axially displaceable support inside the handle member. A torque wrench having a toggle link mechanism interposed between the thruster and a thruster having a visual indicator that can be raised and lowered outside the torque wrench handle member.
Therefore, the visual indicator is related to the operation of the toggle link of the torque wrench, and is a display body that stands up and protrudes from the outer surface of the handle member due to the restoring force of the spring. Has a deterrent link that deters standing
Further, the head member is provided with an operation pin for rotating the inhibition link in relation to the operation of the head member accompanying the operation of the toggle link mechanism when fastening the screw to be fastened,
Above operation of the toggle link mechanism, restoring deterrent of the spring is released, a torque wrench, characterized in that allowed to standing from the handle member outer surface of the torque wrench the display body. 2. The torque wrench according to claim 1, wherein the display body is formed of a light emitting body including a light collecting body, a light storage body, and the like.