JPH0890441A - Torque wrench - Google Patents

Abstract

PURPOSE: To provide a waterproofing torque wrench easily adjusting two values of preset torque. CONSTITUTION: A torque wrench is provided with a stop pin 32 protrusively provided in the peripheral surface of a preset torque adjusting screw 29 ad respective stopper pins protrusively provided respectively in end face two parts of a thrust ring 33 to regulate a right/left direction turn position of the preset torque adjusting screw 29 by stop action with the stop pin 32. In this way, adjusting work, for instance, adjusting a preset torque value to the two values of maximum/minimum preset torque, is very easily further surely performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque wrench capable of changing a set torque and having excellent waterproofness.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional torque wrench structure.
There is a structure as shown in. The conventional structure will be described below. That is, reference numeral 1 is a tubular torque wrench handle, and a head 2 is axially supported by a head pin 3 at the tip of the handle 1, and a thruster 4 is moved inside the handle 1 in the axial direction of the handle 1. The thruster 4 and the head 2 are located so that they can be connected to each other by a toggle link 5. Furthermore, the above thruster 4
Is pressed toward the head 2 by the elastic force of the spring 6 installed inside the handle 1. 7 is a sphere for reducing the frictional force between the side surface of the handle 1 and the inner side surface of the handle 1, 8 is a roller for reducing the frictional force between the thruster 4 and the inner side surface of the handle 1, and 9 is the spring. 6 is an adjusting screw for adjusting a compressive load that presses 6 toward the thruster 4, and a slider 10 that abuts against the spring 6 is meshed with the adjusting screw 9. Reference numeral 11 is a thrust ring for holding the adjusting screw 9 so as to be rotatable and not to move in the axial direction, 12 is an adjusting value indicating scale plate, 13 is an adjusting operating portion integrated with the adjusting screw 9, and 14 is a handle 1. 3 shows a handle member attached to the tail end of the handle.

During the screw tightening work using this torque wrench, when the screw tightening load reaches a predetermined tightening torque, the toggle link 5 operates, whereby the head 2 is brought into contact with the inner contact portion of the handle 1. It is possible to confirm that the screw has been tightened with a predetermined tightening torque value by abutting against the impact force and sensing the tactile sensation by the impact sound and the rapid torque reduction.

To adjust the tightening torque in such a preset torque wrench, the adjusting screw 9 provided at the tail end portion of the handle 1 is rotated by the adjusting operation portion 13 to apply the compressive load of the spring 6. Fine adjustment of the tightening torque can be performed by adjusting.

[0005]

For example, when installing a gas pipe installed in a gas company, it is required that the tightening torque at the time of tightening the pipe connection screw be different in the summer and winter. For example, 600kg in summer
Tightening torque of fcm is used, and in winter, tightening torque of 700kgfcm is required. Therefore, use a single model torque wrench with different torque values. However, in the torque adjusting mechanism of the conventional torque wrench, the accuracy may vary due to individual differences among the adjusting operators who rotate the adjusting screw 9. Alternatively, there is a problem in that an error in the set value may occur due to a misreading of the scale.

Further, since a pipe connection such as a gas pipe buried in the ground is underwater work in which ground water exists, it is required that a torque wrench used in the underwater work is waterproof. It had been.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems and further to meet the conventional demands. Firstly, for example, the set value of the summer torque and the winter torque are set. It is an object of the present invention to provide a torque wrench equipped with a torque adjusting mechanism that can switch the setting value of the operating torque extremely easily and reliably. Secondly, it has a waterproof structure in order to carry out screw tightening work in water.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments shown in the drawings.

In FIGS. 1 and 2, reference numeral 21 denotes a tubular torque wrench handle. A head 22 is pivotally supported by a head pin 23 at the tip of the handle 21, and a rear end of the handle 21 is provided. The handle 24 is fitted.

Inside the handle 21, the thruster 2 is
Reference numeral 5 is internally mounted so as to be movable in the axial direction of the handle 21, and its thruster 25 and the head 22 are connected by a toggle link 26. Furthermore, the above thruster 2
5 is a spring 27 installed inside the handle 21.
Is pressed toward the head 22 by the elastic force of.

Reference numeral 28 denotes a spring receiving body which receives the tail end portion of the spring 27. This spring receiving body 28 has a set torque adjusting screw 29 (hereinafter referred to as a set torque adjusting screw 29 in a screw hole provided on the central axis of the spring receiving body). (Simply referred to as the adjustment screw)
By rotating the adjusting screw 29, the spring receiving body 28 moves in the front-back direction within the handle 21, whereby the elastic force of the spring 27 changes, and the set torque value of the torque wrench can be adjusted. .

The present invention is particularly characterized by the torque adjusting mechanism 30 having the adjusting screw 29. The torque adjusting mechanism will be specifically described below with reference to FIG.

The adjusting screw 29 has a flange portion 31 at the middle portion in the longitudinal direction thereof, and a locking pin 32 is projectingly provided on the peripheral surface of the flange portion 31. Reference numeral 33 is a thrust ring threadedly attached to the inner peripheral surface of the handle 21. The thrust ring 33 has a through hole 34 into which the rear end portion of the adjusting screw 29 is inserted, and the through hole 34. Slot 35,
The pair of left and right stopper pins 36 and 37 that can be locked with the locking pin and the thrust ring 33 are attached to the handle 2
A locking hole 38 for locking a tool 39 used when screwed into the inside of the device 1 is provided.

Reference numeral 40 denotes a scale plate attached to the rear surface of the thrust ring 33. The scale plate 40 has through holes 41 and 42 corresponding to the through holes 34 and the locking holes 38 provided in the thrust ring 33. And the through hole 4 corresponding to the slot
And a scale 44 for displaying two kinds of set torque values at positions corresponding to the stopper pins 36 and 37.
45 is displayed.

Reference numeral 46 denotes a scale window 47 and an end face plate having a connecting hole 48 to be connected to the rear end portion of the adjusting screw 29. Reference numeral 49 is a stopper for preventing the end face plate 40 from being separated from the adjusting screw 29. The ring 50 is screwed into the slot 35 and is a taper screw (lock screw) for positioning the thrust ring 33 inside the handle 21.
Reference numeral 1 is a positioning plate that allows the handle 21 to be inserted up to a predetermined position when the handle 24 is fitted on the handle 21.

As for the assembly of the torque adjusting mechanism 30, as shown in FIG. 2, after the adjusting screw 29 is screwed onto the spring receiving body 28, the collar portion 3 of the adjusting screw 29 is fitted.
The thrust ring 33, which is brought into contact with 1, is screwed to the tail end portion of the handle 21 by using a screwing tool 39, and the adjusting screw 29 is screwed to a desired position at the screwing position, and then the taper screw 50. The thrust ring 33 is positioned by screwing into the slot 35. Next, the scale plate 40 is inserted through the adjusting screw 29 to be fixed integrally with the thrust ring 33, and then the end face plate 46 is integrally connected with the adjusting screw 29 to form a torque adjusting mechanism.

Next, the waterproof structure of the present embodiment will be described. A double-headed drive ratchet 52 is provided at the tip of the head 22, and an oil seal 53 is provided between the ratchet 52 and the head 22. , A seal cover 54 for holding the oil seal 53 is provided,
A waterproof seal is provided between the head 22 and the double-ended drive ratchet 52. In addition, a seal 5 made of silicon rubber or the like is provided in a gap formed between the head 22 and the handle 21.
5 has been given. Further, a waterproof cap 57 is provided in the torque adjusting opening 56 provided at the tail end of the handle 24.
Is detachably attached. Further, a seal 5 made of rubber or the like is also provided between the handle 21 and the tip of the handle 24.
8 is applied to ensure the waterproofness of the entire torque wrench.

The configuration of this embodiment has been described above. Next, the adjusting action of the torque adjusting mechanism 30 will be described.

In FIG. 2, when it is desired to set the set torque of the torque wrench to, for example, 600 kgf · cm, first, the waterproof cap 58 is removed, and the adjusting screw 29 is moved to the position shown in FIG.
Rotate counterclockwise. This rotation is possible until the locking pin 32 provided integrally with the adjusting screw 29 comes into contact with the stopper pin 37.
When 2 comes into contact with the stopper pin 37, the set torque of the torque wrench is set to 600 kgf · cm, and the scale window 47 provided on the end face plate 46 that rotates together with the adjusting screw 29 has the scale plate 40. 600k applied to
The torque is set to 60 after moving to the gf · cm scale 45 position.
It can be confirmed that it was adjusted to 0 kgf · cm.

Next, set the torque of this torque wrench to 70
When you want to set 0kgf · cm, rotate the adjusting screw 29 clockwise (rotate about 270 degrees from the position shown in FIG. 5).
Then, when the locking pin provided on the adjusting screw 29 contacts the stopper pin 36, the set torque of the torque wrench is set to about 700 kgf · cm. At this time, the scale window 47 provided on the end face plate 46 that rotates together with the adjusting screw 29 has a scale of 700 kg provided on the scale plate 40.
The set torque is 700 after moving to the f / cm scale 44 position.
It can be confirmed that the weight has been adjusted to kgf · cm.

As described above, in this embodiment, the adjusting screw 29 has the locking pin 32 and the stopper pins 36,
By rotating until it comes into contact with either one of 37, a predetermined binary torque (for example, 600 kg
Since it is inevitable that the torque can be set to f · cm and 700 kgf · cm, the torque setting work can be performed very easily and surely.

After this torque is set, a waterproof cap 57 is attached to the opening 56 of the handle 24 to enhance waterproofness. The cap 57 is colored to match the display color (eg, white) of the scale 44, for example. Also, prepare a colored cap that matches the display color (for example, red) of the scale 45 or a cap that has the same numerical value as each of the above scales, and attach the colored cap or the numerical display cap that matches the set torque value. Then, the set torque value of the torque wrench can be judged by looking at the color or the numerical value of the cap.

Since the torque wrench of this embodiment has a waterproof structure, the torque wrench can be used underwater.

[0024]

As described above, according to the present invention, the spring receiving body 28 for pressing the end of the torque setting spring 27 housed in the handle 21 and the set torque screwed on the central axis of the spring receiving body 28. In a torque wrench having an adjusting screw 29 and a thrust ring 33 that rotatably supports the adjusting screw 29 and that restricts the axial movement of the adjusting screw 29, in the radial direction of the circumferential surface of the setting torque adjusting screw 29. The protruding locking pin 32 and the thrust ring 3
Stopper pins 36, which are respectively provided at two end surfaces of 3 to restrict the rightward turning position and the leftward turning position of the set torque adjusting screw by a locking action with the locking pin 32. Since it is a torque wrench provided with 37, the adjustment screw 29 is rotated until the locking pin 32 comes into contact with either one of the stopper pins 36 and 37. Since the torque (for example, 600 kgf · cm and 700 kgf · cm) can be set inevitably, there is an effect that the torque setting work can be performed extremely easily and surely by feeling.

[Brief description of drawings]

FIG. 1 is a sectional view showing a conventional torque wrench.

FIG. 2 is a sectional view showing a torque wrench according to an embodiment of the present invention.

FIG. 3 is a side view of a main part cutting showing a torque wrench according to an embodiment of the present invention.

FIG. 4 is an exploded perspective view of a torque adjusting mechanism in the torque wrench of the present invention.

FIG. 5 is an explanatory diagram showing an adjustment value display mode of the torque adjustment mechanism in the torque wrench of the present invention.

[Explanation of symbols]

21 ... Handle 22 ... Head 23 ... Head Pin 24 ... Handle 25 ... Thruster 26 ... Toggle Link 27 ... Spring 28 ... Spring Receptor 29 ... Set Torque Adjusting Screw 30 ... Torque Adjusting Mechanism 31 ... Collar Part 32 ... Locking Pin 33 ... Thrust Ring 34 ... Through hole 35 ... Slot 36 ... Stopper pin 37 ... Stopper pin 38 ... Locking hole 39 ... Screwing tool 40 ... Scale plate 41 ... Through hole 42 ... Through hole 43 ... Through hole 44 ... Scale 45 ... Scale 46 ... End plate 47 ... Scale window 48 ... Coupling hole 49 ... Retaining ring 50 ... Taper screw 51 ... Positioning plate 52 ... Double-ended drive ratchet 53 ... Oil seal 54 ... Seal cover 55 ... Seal 56 ... Opening 57 ... Waterproof Cap 58 ... Seal

Claims (2)

[Claims] 1. A spring receiver (2) for pressing an end of a torque setting spring (27) housed in a handle (21).
8), a set torque adjusting screw (29) screwed onto the central axis of the spring receiver (28), and the adjusting screw (2).
9) rotatably supporting the adjusting screw (2).
In a torque wrench having a thrust ring (33) for restricting axial movement of (9), a locking pin (32) projecting in the radial direction of the circumferential surface of the set torque adjusting screw (29).
And the right rotation position and the left rotation position of the set torque adjusting screw, which are respectively projectingly provided at two end surfaces of the thrust ring (33), are locked with the locking pin (32). Each stopper pin (3
A torque wrench provided with 6) and (37). 2. The torque adjusting mechanism (30) is provided inside the tail end of the handle (21), and the torque adjusting mechanism is a torque wrench that can be adjusted from an opening (56) provided at the tail end of the handle. , In the opening (56),
A torque wrench characterized by being covered with a waterproof cap with an appropriate color or symbols / characters.