JPH09155751A - Torque wrench - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an operating angle and improve operability for a torque wrench used to fasten a hexagon head bolt shaped high frequency circuit connector by providing triangle pole shaped cutouts nearly at the centers of each other opposing holding faces of the head. SOLUTION: The operating angle of an ordinary torque wrench which has no ratchet wheel is determined by the head shapes of a bolt and a nut. In the case that a hexagon head bolt is rotated, 60 deg. is required. In the opening 2 of the head 1 of the torque wrench, triangle pole shaped cutouts 3 are formed nearly at the centers of holding faces 13, 7 to fasten the head of the hexagon bolt so that the tops of the head of the hexagon bolt can correspond thereto. In this way, the hexagon head bolt can be fastened at an operating angle of 30 deg. and a SMA connector mounted in a high frequency circuit for example, with high density, can easily be fastened.

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 SMA type connectors (US military standard MIL-C-39012) mainly used for connection between microwave band devices of communication equipment, and particularly for operating angle. A torque wrench designed for reduction.

[0002]

2. Description of the Related Art The structure of such a manual torque wrench has been standardized in the Japanese Industrial Standard (JIS B4650), and has been used as a tightening tool for a high frequency connector of a communication device. There is a single-purpose torque wrench as shown in FIG. That is, as shown in FIG. 5, in the conventional torque wrench, the handle 4 and the head 16 are fixed by the coupling screw 15.
Is designed to move when a torque exceeding a certain tightening torque is applied around the coupling screw 15 so that an unnecessary tightening torque is not applied to an object to be tightened.

[0003]

In the torque wrench shown in FIG. 5, the direction in which the external force is applied is determined in order to maintain the tightening torque value at a constant value. For example, the torque wrench is turned inside out to apply the external force. It is not possible. Therefore, the operating angle of a torque wrench not equipped with a ratchet wheel is bolt,
It is determined by the head shape of the nut. For example, when the hexagon bolt 5 is rotated as shown in FIG. 6, an operating angle of 60 degrees is required. Similarly, for a bolt having a square head shape, an operating angle of 90 degrees is required,
There was a problem that the operating angle was too wide to tighten the high-frequency circuit that was densely mounted.

Further, in the conventional torque wrench, the operating angle can be reduced by half by making the shape of the head part the same as that of the dodecagonal box wrench, but the head part of the torque wrench is not open. Therefore, there is also a problem that when the eyeglass wrench is removed after tightening the bolt, the bolt must be moved in the axial direction of the bolt.

As described above, it is an object of the present invention to provide a torque wrench with a reduced operating angle and improved operability in order to enable high-density mounting.

[0006]

According to the present invention, in a torque wrench used for tightening a hexagonal bolt-shaped connector for a high-frequency circuit, the holding surface width and the holding surface width are provided at approximately the center of each of the facing holding surfaces of the head portion. A triangular prism-shaped notch is provided having the same length so as to engage with the triangular prism portion at the tip of the hexagon bolt.

Further, according to the present invention, in the torque wrench used for tightening the hexagonal bolt-shaped high-frequency circuit connector, a plurality of corners are provided at the mouth portion of the head portion.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of a torque wrench according to the present invention will be described with reference to the drawings.

FIG. 1 shows the structure of the torque wrench of the present invention. In this figure, the handle 4 is the same as the conventional one, but the structure of the head 1 is different from the conventional shape.

That is, the mouth 2 of the head 1 of the torque wrench
The shape of the holding surface for tightening the head of the hexagon bolt 13,7
A triangular prism-shaped notch 3 is formed so that the apexes of the heads of the hexagonal bolts 5 are substantially aligned with each other. FIG. 2 is an enlarged view of the head 1 and the head of the hexagon bolt 5 when the hexagon bolt 5 is rotated by the torque wrench of the present invention.

FIG. 2 (a) shows a case where the two vertices A and B of the head of the hexagon bolt 5 are in contact with the notches 3 of the torque wrench.

FIG. 2B is a view showing the head 1 and the hexagon bolt 5 when rotated by 30 degrees from FIG. 2A.

As described above, in this embodiment, the hexagon bolt can be tightened at an operation angle of 30 degrees.

Although this embodiment is effective when applied to hexagonal bolts, most of the SMA connectors normally used for high frequency circuits use hexagonal bolts, so they are applied to most high frequency circuits. it can.

Next, using the torque wrench of the present invention, SM
The procedure for tightening the A-type connector will be described with reference to FIG. This figure shows a case where the SMA connector 5 at the tip of the SJ cable and the coaxial connector 10 provided in the high frequency communication device 6 are tightened using a torque wrench.

With the mouth 2 of the torque wrench facing the SMA type connector 5, the holding surface 7 of the torque wrench faces the surface 8 of the SMA type connector 5, and similarly, the holding surface 13 of the torque wrench has an S shape.
Insert so as to fit the surface 11 of the MA connector 5.

Since the screw of the SMA type connector 5 is a right screw, the torque wrench is rotated 30 degrees to the left.

The torque wrench is slid upward until it goes over the end surface of the nut (hexagonal portion) of the SMA connector 5.

At that position, turn the torque wrench 30 to the right.
Rotate degrees.

Slide the torque wrench downwards,
The faces 8 and 12 and the faces 9 and 11 of the SMA type connector 5 are aligned with the notches 3 of the torque wrench and are rotated 30 degrees to the left.

The steps 1 to 3 are repeated until the fastening of the SMA connector is completed.

When the torque wrench is sandwiching the nut on the surface of the notch 3 when the fastening is completed, the torque wrench is slid upward and beyond the end surface of the nut of the SMA connector 5 and then pulled out to the front.

Next, another embodiment of the present invention will be described with reference to FIG.

FIG. 4 is a view showing the structure of the torque wrench of the present invention.

In the figure, the mouth portion 13 of the head 14 is provided with a plurality of corners. This shape can be realized with a shape similar to that used in a dodecagonal box wrench.

In this case, since each angle is in increments of 30 degrees, it is possible to tighten at an operating angle of 30 degrees by shifting the apex of the hexagon bolt by one of the above increments when tightening.

[0027]

According to the present invention, a triangular prism-shaped notch is formed substantially at the center of each of the opposing clamping surfaces of the head portion of the torque wrench so as to engage with the triangular prism portion at the tip of the hexagon bolt having the same length as the clamping surface width. By forming or forming multiple corners, the operating angle of the torque wrench can be 30 degrees. Therefore, S of high-frequency circuits mounted in high density
This has the effect of easily tightening the MA connector.

[Brief description of the drawings]

FIG. 1 is a diagram of a torque wrench according to a first embodiment of the present invention.

FIG. 2 (a) is an enlarged view of the head portion 1 of FIG. 1, showing a state in which hexagon bolts are tightened. (B) It is an enlarged view of the head part 1 of FIG. 1, and is a figure which shows the state rotated by 30 degrees.

FIG. 3 shows the torque wrench of FIG. 1 and the SM of the coaxial cable tip.
It is a figure which shows tightening of an A connector.

FIG. 4 is a diagram of a torque wrench according to another embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a conventional torque wrench.

FIG. 6 is a diagram when tightening a hexagon bolt with the head of FIG. 5;

[Explanation of symbols]

 1,14,16 Head 2,13,20 Mouth 3 Triangular notch 4 Handle 5 Hexagon bolt 6 High frequency communication device 7 Holding surface of torque wrench 8 One side of SMA type connector (plug) 9 SMA type connector One surface of outer peripheral hexagonal part of (plug) 10 Coaxial cable 11 8 Outer peripheral hexagonal part 12 9 Opposite outer peripheral hexagonal part 13 7 Torque wrench holding surface facing 7 15 Coupling screw

Claims (4)

[Claims] 1. A torque wrench used for tightening a hexagonal bolt-shaped connector for a high-frequency circuit, wherein the head of the hexagonal bolt has the same length as the width of the holding surface at substantially the center of each of the facing holding surfaces of the head portion. A torque wrench characterized by having a triangular prism-shaped notch so as to engage with the triangular prism portion. 2. The torque wrench according to claim 1, wherein the width of the triangular prism-shaped notch is at least shorter than the length of one of the hexagons of the hexagon bolt. 3. A torque wrench used for tightening a hexagonal bolt-shaped high-frequency circuit connector, wherein a plurality of corners are provided at a mouth portion of the head portion. 4. The torque wrench according to claim 3, wherein the plurality of corners have a shape used for a dodecagonal box wrench.