JP2002346945A - Bit adapter for torque detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bit adapter for a torque detector that can absorb and relieve rotational inertia force accumulated at a point portion of a rotary tightening tool and ensure measurement of a torque value responsive only to proper turning torque, can ensure a simple and quick operation of completing the torque value measurement without special skill, and can be structurally simplified and manufactured at low cost. SOLUTION: A shaft 36 is coupled at one end with a clamp screw 34 having bit fitting grooves 34a designed for engagement with a point portion of a rotary tightening tool 32, and the other end of the shaft 36 is inserted in a shaft pedestal 38. A one-way clutch coil spring 40 is wound on outer circumferences of the shaft 36 and shaft pedestal 38 to couple them. A lower end of the shaft pedestal 38 is provided with a square step 38a designed for engagement in a bit connecting part 22 on a torque detector 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly line for various industrial products and the like, which is capable of maintaining the tightening of screws and bolts at a predetermined torque value by a rotary tightening tool such as an electric screwdriver or an air screwdriver. The present invention relates to a bit adapter for a torque detector capable of easily confirming or maintaining torque accuracy by connecting the rotary tightening tool to a torque detector.

[0002]

2. Description of the Related Art Conventionally, when assembling various industrial products by tightening screws and bolts with a rotary tightening tool such as an electric screwdriver or an air screwdriver, it is important to always tighten with a constant torque value. It is. For this reason, the rotary tightening tool is required to set and set a reference torque value so that the tightening torque value can always maintain a predetermined value, and use a proper torque detector to rotate the rotary tightening tool. Torque management work that can adjust the torque of the tightening tool is indispensable.

Therefore, conventionally, as a torque adjusting means of the rotary tightening tool, for example, a coil spring and a clutch mechanism are combined, and the compression state of the coil spring is adjusted so that the setting of the tightening torque value can be performed with high accuracy. What is configured to be able to do so is known. That is, this kind of torque adjusting means is configured based on the principle of finding a balance point between the spring constant of the coil spring and the rotational force of the rotary tightening tool acting in the axial direction.

However, as a means for smoothly managing the torque of the rotary tightening tool, the present inventor uses a strain gauge or the like to measure the torque value of the rotary tightening tool and instantaneously converts the measured torque value into a digital value. A bit adapter (rotary inertia buffer) comprising a liquid crystal display portion which can be displayed and confirmed, and comprising a coupling means for coupling a driver bit of a rotary tightening tool and transmitting the rotary tightening force. A device equipped with a torque detector configured to detect a torque value set in the rotary tightening tool through the above-described method has been developed. Japanese Patent No. 1456555 (Japanese Patent Publication No. 63-41)
No. 30).

However, as described above, in the torque detector using the strain gauge, when the tightening force of the screw or the like by the rotary tightening tool is completely transmitted, the rapidly changing tightening force is directly transmitted to the strain gauge. The rotational inertia force of the output shaft of the tightening tool directly acts on the strain gauge, and it is not possible to detect an appropriate torque value.

Therefore, the invention according to the above-mentioned patent is characterized in that one end side of a threaded shaft is adjustably screwed to a shaft receiving base having a threaded hole, and the other end of the shaft is connected to an output shaft of a rotary tightening tool. A locking portion detachably engaged is provided, a flange portion is provided on a part of the shaft adjacent to the locking portion, and a thrust bearing and a coil spring are provided between the flange portion and the shaft receiving base. A bit adapter (rotary inertia buffer) functioning as a means for buffering the rotational inertia of the output shaft of the rotary tightening tool is interposed.

FIGS. 5 and 6 show a schematic configuration of the above-mentioned conventional bit adapter (rotary inertial force buffer). In FIG. 5 and FIG.
0 is the bit coupling unit 22 provided in the torque detector 20
Shaft pedestal 13 with a screw hole integrally provided with a square step 12 that fits tightly into a special opening shape formed in
A shaft 14 having a thread groove formed so that one end thereof can be screwed into a screw hole 13a provided in the center of the receiving base 13 so as to be able to advance and retreat, and concentric with the shaft 14 so as to surround the shaft 14 Coil spring 15 which is inserted and arranged
And a flange 16 which is located on the opposite side of the shaft 14 from the receiving stand 13 and which clamps the compression coil spring 15 together with the receiving stand 13.

The other end of the shaft 14 is detachably connected to the tip of an output shaft 24 of a rotary tightening tool such as an electric screwdriver, an air screwdriver, or a nut setter, which is an object to be measured. Similarly to the driver bit and the like, an engaging portion 14a formed at an end of the bit and the like and having a chuckable shape is provided. With respect to the shaft 14 thus formed, the flange portion 16
The bearing receiver 17 formed so that it may surround is provided. That is, the bearing receiver 17 is loosely fitted to the shaft 14, and surrounds and holds the flange 14 with the flange 16 via a washer 18 and a thrust bearing 19 as appropriate, so that the bearing receiver 17 is slidable with respect to the flange 16. Place in contact. The compression coil spring 15 inserted between the bearing support 17 and the support base 13 so as to surround the shaft 14 is elastically pressed and held at both ends (see FIG. 6). ).

The bit adapter 1 configured as described above
Reference numeral 0 denotes a state in which the engaging portion 14a of the shaft 14 is engaged with the output shaft 24 of the rotary tightening tool, which is an object to be measured, and the square step portion 12 formed integrally with the shaft receiving base 13 is subjected to torque detection. The measurement preparation is completed by tightly fitting to the bit coupling portion 22 of the device 20 (see FIG. 5).

Next, when the rotary tightening tool is operated, the shaft 14 rotates together with the output shaft 24, and the shaft 14 rotates.
Is screwed into a screw hole 13 a provided at the center of the receiving table 13. As a result, the compression coil spring 15 is compressed in the axial direction between the bearing receiver 17 and the pedestal 13, and when the compression limit reaches a compression limit corresponding to the magnitude of the rotational torque applied to the shaft 14, the shaft 14 is no longer supported. It cannot be screwed into the screw hole 13a of the base 13.

In this manner, the rotational torque obtained on the output shaft 24 of the rotary tightening tool is applied to the bit adapter 10.
, The rotational inertia force is absorbed by plastic deformation due to the elastic force of the compression coil spring 15, and only the net rotational torque is detected. Can be transmitted to the department.
As a result, in the detecting section of the torque detector 20, the rotational inertia force accumulated in the output shaft 24 of the rotary tightening tool is absorbed and reduced by the elastic force of the compression coil spring 15, and the same as in the actual rotary tightening operation. It reproduces the state and enables accurate measurement of the torque value in response to only the net rotational torque.

[0012]

However, in the conventional torque detector bit adapter having the above-described configuration, when preparing for measuring a set torque value for tightening a screw or the like of a rotary tightening tool, The operation of connecting the tip of the output shaft 24 of the rotary tightening tool to the bit adapter 10 for the torque detector and fitting the bit adapter into the bit coupling portion 22 of the torque detector 20 requires a little time and effort. At the same time, there is a problem to be solved such that the operator also requires skill.

Further, the conventional torque detector bit
In the adapter, when the torque value is measured, the threaded shaft 14 is forcibly screwed into the screw hole 13a of the shaft receiving base 13 against the elastic force of the compression coil spring 15, so that the shaft 14 On the other hand, as a result of applying an excessive stress, the shaft 14 may be instantaneously broken after a large number of operations.

The inventor of the present invention has conducted intensive studies and studies on the above-mentioned problems with the conventional bit adapter for a torque detector, and as a result, as a result, rotationally tightening a driver bit or the like coupled to an output shaft of a rotational drive source. A torque detector bit adapter configured to couple a tool to a bit coupling portion of the torque detector, and a bit that engages the tip end of the rotary tightening tool at one end side with respect to the bit adapter. A shaft to which a tightening screw having a fitting groove is connected is provided, and the other end of the shaft is inserted into a shaft receiving stand, and a one-way clutch coil spring is wound around the shaft and the outer periphery of the shaft receiving stand. And a square step at the lower end of the shaft cradle to engage with the bit coupling of the torque detector. Absorbs alleviate rotational inertia force of the rotary fastening tool by the one-way clutch coil spring,
In addition to being able to measure the torque value in response to only the proper rotational torque, the torque value is measured after being coupled to the tip of the rotational tightening tool and closely fitted to the bit coupling portion of the torque detector. Work to complete the measurement of
It has been found that it can be achieved easily and quickly without special skill.

That is, a one-way clutch coil spring is used as a connecting means between a shaft to which a tightening screw to which a rotary tightening tool is directly transmitted and a shaft to which a tightening screw is connected, and acts on the tightening screw. When the tightening force of the rotary tightening tool is increased, the one-way clutch coil spring operates so as to wind the shaft and the shaft cradle together with the screw elasticity thereof, while absorbing and relaxing the rotational inertia force of the rotary tightening tool. The tightening force of the rotary tightening tool is transmitted to the shaft cradle, so that an appropriate torque value can be measured.

Further, in the torque detector bit adapter having the above-mentioned configuration, a flange portion is provided at an upper end portion of the shaft, and a screw groove is screwed at a central portion thereof.
The tightening screw is screwed into the screw groove via a washer made of an elastic member and a metal plate between the flange and the flange, and the lower end of the shaft is inserted into the shaft receiving base via a bearing. By adopting the stopped configuration, the rotational inertia force of the rotary tightening tool can be more appropriately absorbed and alleviated, and the operation up to the completion of the measurement of the torque value described above can be appropriately performed without skill. And found that it could be achieved safely.

Accordingly, it is an object of the present invention to connect a rotary tightening tool such as a driver bit, which is connected to the output shaft of a rotary drive source, to a bit connecting portion of a torque detector so that an appropriate rotation tightening tool can be used. When measuring the torque value, it is detachably connected to the rotary tightening tool, absorbs and relaxes the rotational inertia force accumulated at the tool tip, and measures the torque value in response to only the appropriate rotational torque. In particular, the work required to couple this to the tip of the rotary tightening tool and closely fit to the bit coupling part of the torque detector until the measurement of the torque value is completed requires special skill. The present invention provides a bit adapter for a torque detector which can be achieved simply and quickly without any problem, and can be manufactured at a low cost with a simple configuration.

[0018]

In order to achieve the above object, a bit adapter for a torque detector according to the present invention is provided.
A torque detector bit adapter configured to couple a rotary tightening tool, such as a driver bit, coupled to an output shaft of a rotary drive source to a bit coupling portion of a torque detector. A shaft to which a tightening screw provided with a bit fitting groove engaged with the tip of the shaft is provided, and the other end of the shaft is inserted into a shaft receiving stand, and a one-way clutch is provided around the shaft and the shaft receiving stand. A coil spring is wound around and can be connected to each other, and a lower end of the shaft receiving base is provided with a rectangular step portion which engages with a bit connecting portion of a torque detector, and is rotated by the one-way clutch coil spring. A torque characterized by absorbing and relaxing the rotational inertial force of a tightening tool and measuring a torque value responsive only to an appropriate rotational torque. Dexterity bit adapter out.

In this case, one end of the one-way clutch coil spring is fixedly connected to a part of a shaft receiving base, and the shaft and the shaft receiving base are clutch-coupled to each other when the shaft is rotated forward to tighten a screw. When the shaft is rotated in the reverse direction, the clutch can be disengaged from the shaft and the shaft receiving base.

Further, a synthetic resin bush may be inserted into a part of the outer periphery of the shaft, and the one-way clutch coil spring may be wound around the bush so as to be able to come into close contact with the outer peripheral surface of the bush. .

Further, a flange portion is provided at the upper end of the shaft, and a screw groove is screwed at the center thereof. A washer made of an elastic member and a metal plate is interposed between the screw groove and the flange portion. And the lower end of the shaft is inserted and locked in the shaft receiving base via a bearing.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a bit adapter for a torque detector according to the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 to 4 show an embodiment of a bit adapter for a torque detector according to the present invention.
1 is a schematic perspective view of the torque detector bit adapter 30 in the present embodiment, FIG. 2 is a central longitudinal sectional view showing the internal configuration of the torque detector bit adapter 30 in the present embodiment, and FIG. Is a plan view of the torque detector bit adapter 30 shown in FIG. 4, and FIG. 4 is a bottom view of the torque detector bit adapter 30 shown in FIG.

However, the bit adapter 3 of the present embodiment
Reference numeral 0 denotes a shaft coupled with a tightening screw 34 having a bit fitting groove 34a which engages with a tip of a rotary tightening tool 32 such as a driver bit connected to an output shaft of a required rotary drive source at an upper end. 36, a lower end of the shaft 36 is inserted and locked into a shaft receiving base 38 via a bearing 39 as appropriate, and a one-way clutch coil spring 40 is wound around the outer periphery of the shaft 36 and the shaft receiving base 38. , So that they can be connected to each other. As described above, the lower end portion of the shaft receiving base 38 has a bit coupling portion 22 provided on the torque detector 20.
In a special opening shape portion formed in (see FIG. 5), a square step portion 38a to be closely fitted is provided.

In this case, one end 40a of the one-way clutch coil spring 40 is fixedly connected to a part of a shaft receiving base 38, and the shaft 36 is rotated forward (right rotation) when screws are tightened. The shaft 36 and the shaft receiving base 38 are clutch-coupled and set to rotate simultaneously (see FIG. 1). When the shaft 36 rotates in the reverse direction (at the time of left rotation), the clutch connection between the shaft 36 and the shaft receiving base 38 is released (see FIG. 1).

A flange 36a is provided at the upper end of the shaft 36, and a thread groove 36 is formed at the center thereof.
and a washer 4 made of an elastic member 42a made of rubber or synthetic resin and a metal plate 42b between the screw groove 36b and the flange 36a.
3, the tightening screw 34 is screwed (see FIG. 2).

A synthetic resin bush is inserted into the gap portion 44 formed on a part of the outer periphery of the shaft 36 as shown by a broken line, and the bush is made so as to be in close contact with the outer peripheral surface of the bush. A configuration in which the one-way clutch coil spring 40 is wound may be employed.

A cover member is provided around the shaft 36 so as to surround the one-way clutch coil spring 40 wound around the outer periphery of the shaft 36, and the upper end of the cover member is appropriately connected to the shaft 36 via a bearing. It is also possible to adopt a configuration in which the lower end of the cover member is fixedly connected to the outer peripheral portion of the shaft receiving base 38 by being fixedly connected to the upper end. With such a configuration, it is possible to prevent an unexpected accident or the like due to, for example, contact with the one-way clutch coil spring 40 during the measurement of the torque value. Property can be sufficiently secured.

The bit of the present embodiment thus constructed
According to the adapter 30, when measuring the set torque value for tightening the screw or the like of the rotary tightening tool 32,
The tip of the rotary tightening tool 32 is connected to the bit adapter 30 for the torque detector, and this is closely fitted to the bit connecting portion 22 of the torque detector 20 until the measurement of the torque value is completed. In addition, the one-way clutch coil spring 40 absorbs and relaxes the rotational inertia of the rotary tightening tool 32 so that a torque value responsive only to an appropriate rotational torque can be measured, and particularly skill is required. Can be achieved simply and quickly without any additional effort.

In the bit adapter 30 of the present embodiment, the coil spring 40 for the one-way clutch is used as a means for absorbing and relaxing the rotational inertial force of the rotary tightening tool 32, so that the design dimensions of the coil spring ( The wire diameter of the coil spring or the like can be relatively small as compared with the conventional bit adapter, and the manufacturing cost can be reduced. Further, when the rotary tightening tool 32 is rotated in the reverse direction (rotation in the direction of removing the screw), the clutch function is released and the shaft idles, so that the coil spring is not deformed or damaged, and is extremely safe in handling. And so on.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and many design changes can be made without departing from the spirit of the present invention. Of course you can.

[0032]

As is apparent from the above-described embodiment, the torque detector bit adapter according to the present invention uses a rotary tightening tool such as a driver bit connected to the output shaft of a rotary drive source. In a bit adapter for a torque detector configured to be coupled to a bit coupling portion, a shaft coupled with a tightening screw having a bit fitting groove engaged with a tip of the rotary tightening tool at one end side is provided. The other end of the shaft is inserted into the shaft receiving base, and a one-way clutch coil spring is wound around the outer periphery of the shaft and the shaft receiving base so that they can be connected to each other. Is provided with a rectangular step portion which engages with the bit coupling portion of the torque detector, and the one-way clutch coil spring absorbs the rotational inertia force of the rotary tightening tool. Then, by adopting a configuration capable of measuring a torque value responsive only to an appropriate rotational torque, the tip of a rotary tightening tool is coupled to the torque detector bit adapter, and the torque detector bit adapter is connected to the torque detector bit adapter. The work from the close fitting of the joint to the completion of the measurement of the torque value can be achieved simply and quickly without any special skills, and it is manufactured at a low cost with a simple configuration. can do.

According to the bit adapter for a torque detector according to the present invention, one end of the one-way clutch coil spring is fixedly connected to a part of a shaft receiving base.
At the time of normal rotation for tightening the screw, the shaft and the shaft support are clutch-coupled. At the time of reverse rotation of the shaft, the clutch connection between the shaft and the shaft support is released. In the part, a flange portion is provided and a screw groove is screwed at the center thereof, and the tightening screw is screwed into the screw groove via a washer made of an elastic member and a metal plate between the screw groove and the flange portion, Furthermore, by adopting a configuration in which the lower end portion of the shaft is inserted and locked in the shaft receiving base via a bearing, the rotational inertia force of the rotary tightening tool can be more appropriately absorbed and reduced. The operation up to the completion of the measurement of the torque value can be properly and safely achieved without skill.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a bit adapter for a torque detector according to the present invention.

FIG. 2 is a central longitudinal sectional view of the bit adapter for a torque detector shown in FIG. 1;

FIG. 3 is a plan view of the bit adapter for a torque detector shown in FIG. 2;

FIG. 4 is a bottom view of the detector bit adapter shown in FIG. 1;

FIG. 5 is a cross-sectional side view of a main part showing a schematic configuration of a conventional bit adapter for a torque detector.

FIG. 6 is a schematic explanatory view showing a use state of the conventional torque detector bit adapter shown in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Torque detector 22 Bit coupling part 30 Bit adapter 32 Rotational tightening tool 34 Tightening screw 34a Bit fitting groove 36 Shaft 36a Flange part 36b Screw groove 38 Shaft receiving stand 38a Square step 39 Lower bearing 40 One-way clutch coil spring 40a Fixed end of coil spring 42a Elastic member 42b Metal plate 43 Washer 44 Gap

Claims (4)

[Claims] 1. A torque detector bit / torque configured to couple a rotary tightening tool such as a driver bit coupled to an output shaft of a rotary drive source to a bit coupling portion of a torque detector.
In the adapter, a shaft to which a tightening screw having a bit fitting groove engaged with the tip of the rotary tightening tool at one end is provided, and the other end of the shaft is inserted into a shaft receiving stand, A coil spring for a one-way clutch is wound around the outer periphery of the shaft and the shaft support so as to be coupled to each other, and further, a square step which is engaged with a bit coupling portion of a torque detector at a lower end of the shaft support. A part for providing a one-way clutch coil spring to absorb and alleviate the rotational inertia force of the rotary tightening tool so that a torque value responsive only to an appropriate rotational torque can be measured. Bit adapter. 2. The one-way clutch coil spring, one end of which is fixedly connected to a part of a shaft receiving base, and the shaft and the shaft receiving base are clutch-coupled at the time of normal rotation for tightening a screw. 2. The bit adapter for a torque detector according to claim 1, wherein the clutch is disengaged between the shaft and the shaft support when the shaft rotates in the reverse direction. 3. The one-way clutch coil spring is wound around a part of the outer periphery of the shaft with a synthetic resin bush inserted therein so as to be in close contact with the outer peripheral surface of the bush. Item 3. A bit adapter for a torque detector according to Item 1 or 2. 4. A flange is provided at an upper end of the shaft, and a screw groove is screwed at a center of the flange, and a washer formed of an elastic member and a metal plate is interposed between the screw groove and the flange. 2. A bit adapter for a torque detector according to claim 1, wherein said tightening screw is screwed together, and a lower end of said shaft is inserted and locked in said shaft receiving base via a bearing.