JP7299772B2 - rotary tool - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rotary tool capable of tightening a screw while managing torque.

A hand-cranked torque driver is known as a rotary tool capable of tightening a screw while managing torque (for example, the one described in Patent Document 1).

A machine tool such as a milling machine is equipped with a tip C made of superhard material for cutting. The chip C is fixed to a chip holder H shown in two forms in FIG. 8 with screws S whose torque is controlled. Chip C is a consumable item and may have to be replaced multiple times a day. Also, there is a chip holder H to which a large number of chips C are attached.

JP 2018-134713 A

Conventionally, tip replacement was performed manually using a hand-cranked tool (such as a torque driver). Therefore, since many tips must be replaced while managing the torque, the burden on the operator is heavy, and there is room for improvement.

In addition, rotary tools are small because there are fine chips (for example, less than 1 cm square), the working space is sometimes narrow, and the fatigue of workers increases. is desirable.

In view of the above problems, an object of the present invention is to provide a compact rotating tool that can reduce the burden on the operator.

A rotary tool according to the present invention is a rotary tool used for tightening a screw, and includes a driving portion that generates a first rotational driving force, a grip portion that receives an input of the second rotational driving force, and one end side of a rotation axis. a distal end portion for transmitting the first rotational driving force or the second rotational driving force to the screw; a first mode in which the first rotational driving force is transmitted from the driving portion to the distal end portion; a switching unit for switching between a second mode in which a second rotational driving force is transmitted from the gripping portion to the distal end portion; and a torque management unit that limits transmission of the second rotational driving force to the distal end portion when the driving force exceeds a predetermined magnitude.

Further, the torque management section includes a biasing section, and in the second mode, when the second rotational driving force exceeding the biasing force of the biasing section is applied, transmission of the second rotational driving force is stopped. It may be restricted.

Moreover, in the first mode, the first rotational driving force may be directly transmitted from the drive section to the tip section.

Further, the gripping portions may be provided so as to extend to opposite positions with the rotation axis interposed therebetween.

Further, the grip portion may have an illumination portion whose optical axis faces the tip of the tip portion.

ADVANTAGE OF THE INVENTION This invention is effective in being able to reduce a worker's burden, and also being compact.

1 is a rear perspective view showing a rotary tool according to an embodiment of the present invention; FIG. FIG. 4 is a vertical cross-sectional view of the rotary tool along the axis of rotation of the driving portion; FIG. 3 is a vertical cross-sectional view of the rotary tool taken along the line III-III in FIG. 2; FIG. 3 is a vertical cross-sectional view of the rotary tool taken along line IV-IV in FIG. 2; It is the perspective view which extracted and showed the drive part among the said rotary tools. FIG. 3 is an exploded perspective view showing a configuration related to a switching section and a torque management section of the rotating tool. It is a perspective view of a longitudinal section showing the periphery of a torque adjusting portion of the rotary tool. FIG. 2 is a schematic diagram showing a tip and a tip holder, which are examples of objects for which the rotary tool is used;

A rotary tool 1 according to an embodiment of the present invention will be described below with reference to the drawings. Regarding the front-rear direction in the following description, the side closer to the screw is the front side, and the side farther from the screw (the side closer to the operator) is the rear side. However, the front-rear direction is defined only for convenience of explanation, and is not used with the intention of limiting the invention.

In the rotary tool 1 of the present embodiment, in the initial stage of fastening work (stage where a small rotational load (torque) is required), the rotational driving force (first rotational driving force) of the drive section 3 (motor 31) tightens the screw. In the final stage of the fastening work (stage where a larger rotational load (torque) is required than in the initial stage), the operator manually tightens the screw while managing the torque. That is, the rotary tool 1 of the present embodiment is a hand tool assisted by the rotational driving force of the motor 31 rather than an electric tool in which fastening is performed by the rotational driving force of the motor until the end of the fastening work. Since the motor 31 is provided in an auxiliary manner, the output can be set according to a small rotational load. For this reason, compactness as a hand tool is less likely to be impaired. The screw, which is the object to be fastened of the rotary tool 1 of the present embodiment, receives a rotational driving force (first rotational driving force or second rotational driving force) so as to be screwed into the object to be screwed. It works and the torque increases at the end of the fastening operation. In the present invention, screws also include bolts and nuts.

A rotary tool 1 of the present embodiment mainly includes a grip portion 2, a drive portion 3, a tip portion 4, a switching portion 5A, and a torque management portion 5B. As shown in FIGS. 1 and 2, the rotary tool 1 has a substantially T-shaped outer shape when viewed from the side. A gripping portion 2 is provided on the rear side of the rotary tool 1 , and a body housing 6 in which the driving portion 3 and the like are accommodated is provided continuously on the front side of the gripping portion 2 . A tip portion 4 protrudes from the front end of the body housing 6 . A display window 61 for displaying a set torque value is provided on the side of the body housing 6 .

The gripping portion 2 is a portion to which a rotational driving force (second rotational driving force) is input by being rotated around the rotational axis L of the rotary tool 1 . Therefore, the grip part 2 receives the input of the second rotational driving force. Specifically, the grip portion 2 corresponds to the horizontal rod portion of the substantially T-shape. The gripping portion 2 is gripped by an operator's hand, and the second rotational driving force is input to the gripping portion 2 by twisting the operator's hand. Since the body housing 6 is provided in front of the grip part 2 , when the second rotational driving force is input to the grip part 2 , the body housing 6 also rotates. As shown in FIG. 2, the gripping portion 2 is rod-shaped so as to extend to opposite positions across a rotation axis L extending in the front-rear direction (that is, a radially outer position with respect to the rotation axis L). there is With this shape of the gripping portion 2, the radius of rotation when the operator twists the hand can be made larger than in the case where the gripping portion 2 has the shape of a straight rod. Therefore, it is possible to input a large second rotational driving force even if it is manually rotated.

A drive switch 21 protrudes from the rear surface of the grip portion 2 . The drive switch 21 changes the number of revolutions of the drive section 3 in a plurality of steps (two steps in this embodiment) depending on the degree of pressing of the grip portion 2 into the main body. A forward/reverse selector switch 22 protrudes from the side surface of the gripping portion 2 for switching the direction of rotation of the driving portion 3 between the screw tightening direction and the screw loosening direction.

Further, the grip portion 2 is formed with an illumination portion 23 whose optical axis faces the tip of the tip portion 4 . Specifically, the direction of the optical axis of the illumination section 23 is set so as to illuminate the tip (more specifically, the tip of the engagement tool 41) that is the portion of the tip portion 4 that engages with the screw. As a result, it is possible to improve the convenience of the screw tightening work by the user.

The drive unit 3 generates a rotational driving force (first rotational driving force) inside the rotary tool 1 . As shown in FIGS. 2 and 5, the drive unit 3 of the present embodiment mainly has an electric motor 31, a gear unit 32, and an output shaft 33, and generates, decelerates, and outputs the first rotational driving force. conduct. In the present embodiment, the rotation axis of the drive unit 3 is along the rotation axis L of the rotary tool 1 itself, but it is not limited to this. They can be provided in parallel or can be provided in crossing directions. A power source for driving the drive unit 3 is a battery 34 such as a rechargeable battery built into the grip unit 2 . However, the drive unit 3 can also be driven by power supply from the outside. In relation to storing the battery 34, the grip part 2 of the present embodiment has a horizontal rod portion in the substantially T shape, the part for storing the battery 34 is longer than the other part, and the rotation axis L is the reference. It has an asymmetrical shape. However, the shape of the grip portion 2 is not limited to this. The gear unit 32 is a part that reduces the speed of the first rotational driving force. A planetary gear is incorporated in the gear unit 32 of this embodiment. The output shaft 33 has a bifurcated shape as shown in FIG. 5, and has a rear end connected to the gear unit 32 and a front end connected to the first spindle lock 51 which is a part of the switching section 5A.

The tip portion 4 is positioned on one end side (the right end side in FIG. 2) of the rotation axis L of the gripping portion 2 and the driving portion 3, and has a rotational driving force (the first rotational driving force or the above second rotational driving force). The tip 4 is provided with an engagement tool 41 that engages the screw. The engaging tool 41 is detachable from the main body of the distal end portion 4 . The shape of the tip portion of the engaging tool 41 matches the shape of the portion of the screw that receives the rotational driving force to such an extent that the rotational driving force can be transmitted by engagement. The shape of the portion formed on the head of the screw to be engaged with the tip portion of the engaging tool 41 is a general plus groove, minus groove, polygonal hole (hexagonal hole, etc.), polygonal prism (hexagonal prism, etc.). , or a special shape that cannot be removed with a general tool.

The switching portion 5A switches the transmission path of the rotational driving force (first rotational driving force or second rotational driving force) to the distal end portion 4 . The switching portion 5A of the present embodiment has a first mode in which the first rotational driving force is transmitted from the driving portion 3 to the distal end portion 4, and a second mode in which the second rotational driving force is transmitted from the grip portion 2 to the distal end portion 4. switch between modes. Each mode will be described later.

The torque control section 5B is interposed in the transmission path of the second rotational driving force from the grip section 2 to the distal end section 4 during manual rotation, that is, in the second mode, and the second rotational driving force exceeds a predetermined magnitude. , the transmission of the second rotational driving force to the distal end portion 4 is restricted. Specifically, the torque management section 5B of the present embodiment includes an urging section (cam urging section 57), and in the second mode, a second rotational driving force exceeding the urging force of the cam urging section 57 is applied. the transmission of the second rotational driving force is restricted. Due to this torque control section 5B, the tip portion 4 is not subjected to the second rotational driving force exceeding a predetermined magnitude. Therefore, the screw can be tightened while managing the torque.

Here, an internal mechanism for transmitting rotational driving force in this embodiment will be described. 2 and 6, a first spindle lock 51, a second spindle lock 52, a first cam 53, a second cam 54, a pin 55, an intermediate shaft 56, and a cam urging portion 57 and a torque adjusting screw 58 are provided. These are built in the body housing 6 . A tool engaging portion 581 that is part of the torque adjusting screw 58 is exposed from the body housing 6 .

A rear portion of the first spindle lock 51 is connected to the output shaft 33 of the drive section 3 . Therefore, the first spindle lock 51 rotates together with the output shaft 33 . The second spindle lock 52 is located in front of the first spindle lock 51 and partially overlaps in the front-rear direction. At this partially overlapped portion (position III-III in FIG. 2), as shown in FIG. is provided. Correspondingly, the first spindle lock 51 is provided with a plurality of recesses 511 (four in the present embodiment) recessed in the radially inner direction. As shown, the circumferential dimension of each recess 511 in the first spindle lock 51 is larger than the circumferential dimension of each protrusion 521 in the second spindle lock 52 . Therefore, one of the first spindle lock 51 and the second spindle lock 52 can move in the circumferential direction by the difference in circumferential dimension between the recess 511 and the projection 521 . 4, the second spindle lock 52 has flat surfaces 522 formed in portions corresponding to the pins 55 (four locations in this embodiment) at the IV-IV position in FIG. A curved surface 523 is provided between the planes.

The first cam 53 is a bottomed cylindrical body with a bottom located forward, and is provided so as to cover a part of the front side of the first spindle lock 51 and the entire second cam 54 from the radially outer side. ing. An intermediate shaft 56 passes through the center of the front end of the first cam 53 . As shown in FIG. 6 , a plurality of radially extending mountain-shaped projections 531 are formed on the front end surface of the front end portion of the first cam 53 so as to be arranged in the circumferential direction.

The second cam 54 is also a cylindrical body with a bottom positioned forward, and is positioned so as to cover a portion of the front side of the first cam 53 from the radial outer side. As shown in FIG. 4, the second cam 54 is non-rotatably fitted to the body housing 6 . Accordingly, when the body housing 6 rotates with the rotation of the grip portion 2, the second cam 54 also rotates. However, the second cam 54 is movable in the front-rear direction with respect to the body housing 6 . An intermediate shaft 56 passes through the center of the front end of the second cam 54 . A plurality of recesses extending in the radial direction are formed side by side in the circumferential direction on the rear end surface of the front end portion of the second cam 54 . Although not shown, this recess has a shape that matches the protrusion 531 of the first cam 53 . Also, the rear end surface of the cam biasing portion 57 contacts the front end surface of the front end portion of the second cam 54 .

As shown in FIG. 2, the pins 55 are sandwiched between the first spindle lock 51, the second spindle lock 52, and the first cam 53, and as shown in FIG. ) is provided. The plurality of pins 55 are arranged substantially evenly in the circumferential direction. The diameter of the pin 55 is approximately equal to the distance between the plane 522 formed on the second spindle lock 52 and the inner peripheral surface of the first cam 53 diametrically opposed to this plane, as shown in FIG. Therefore, when the pin 55 tries to shift in the circumferential direction of the second spindle lock 52 , it is caught between the second spindle lock 52 and the first cam 53 .

The intermediate shaft 56 is a shaft that extends in the front-rear linear direction and is provided so as to coincide with the rotation axis L. As shown in FIG. A rear end portion of the intermediate shaft 56 is fixed to the second spindle lock 52 . A front end portion of the intermediate shaft 56 is fixed to the tip portion 4 .

The cam biasing portion 57 is provided so as to be able to extend and contract in the front-rear direction. In this embodiment, a coil spring is used as the cam biasing portion 57, and is provided so as to surround the axis of the intermediate shaft 56 on the radial outer side. The rear end of the cam biasing portion 57 contacts the front end surface of the front end portion of the second cam 54 . The front end of the cam biasing portion 57 contacts the inner surface of the stepped portion 582 of the torque adjusting screw 58 .

A torque adjusting screw 58 is provided to be screwed into the front end of the body housing 6 . Depending on the degree of screwing into the body housing 6, the longitudinal dimension of the cam biasing portion 57 can be changed, and the set torque value can be adjusted accordingly. The larger the screwing degree of the torque adjusting screw 58, the larger the set torque value. The torque adjusting screw 58 has a tool engaging portion 581 at a portion exposed from the body housing 6 . By engaging a tool with the tool engaging portion 581 and rotating it, the torque adjusting screw 58 can be tightened or loosened. The torque adjusting screw 58 has a front portion located radially outside the distal end portion 4 and a rear portion located radially outside the cam biasing portion 57 . In this embodiment, the front portion is formed with a small diameter and the rear portion is formed with a large diameter. A stepped portion 582 is formed between the front portion and the rear portion, and the front end surface of the cam biasing portion 57 contacts the rear surface of the stepped portion 582 . As shown in FIG. 7 , a front threaded portion 583 that is screwed into the body housing 6 is formed on the outer circumference of the front portion of the torque adjusting screw 58 . A rear threaded portion 584 for moving the torque indicator 59 is formed on the outer periphery of the rear portion.

The switching portion 5A is composed of a first spindle lock 51, a second spindle lock 52, a first cam 53, and a pin 55. As shown in FIG. Regarding the operation of the switching portion 5A, first, the first mode in which the first rotational driving force is transmitted from the driving portion 3 to the distal end portion 4 will be described. The rotation of the motor 31, which is the driving source of the driving section 3, is decelerated by the gear unit 32 and transmitted to the tip section 4 via the output shaft 33, the first spindle lock 51, the second spindle lock 52, and the intermediate shaft 56. be. When the first spindle lock 51 rotates due to the rotation of the driving portion 3 , the protrusion 521 shown in FIG.

In the first mode, the pin 55 rotates with the first spindle lock 51 while remaining in the gap between the second spindle lock 52 and the first cam 53 (see FIG. 4). In the first mode, the edge of the first cam 53 is cut off with respect to the first spindle lock 51 and the second spindle lock 52 . Therefore, the torque management section 5B does not operate.

Next, the second mode for manually tightening screws will be described. First, the second cam 54 rotates as the body housing 6 rotates together with the grip portion 2 . Below the torque set by the torque management unit 5B, the projection 531 formed on the front end face of the front end of the first cam 53 and the recess (not shown) formed on the rear end face of the front end of the second cam 54 are engaged, the first cam 53 also rotates. As the first cam 53 rotates, the pin 55 tries to move in the circumferential direction. This pin 55 is caught between the first cam 53 and the second spindle lock 52 . The bitten pin 55 causes the first cam 53 to restrain the second spindle lock 52, and the intermediate shaft 56 fixed to the second spindle lock 52 also rotates. At this time, the reaction force from the tip portion 4 tries to rotate the second spindle lock 52, but the engagement of the pin 55 occurs before the engagement between the projection 521 and the recess 511 shown in FIG. Since the reaction force is generated, the reaction force is not transmitted to the drive unit 3 .

Therefore, since the switching portion 5A allows transmission of the rotational driving force toward the distal end portion 4, the first rotational driving force from the driving portion 3 in the first mode is also the second rotational driving force from the grip portion 2 in the second mode. Forces are also transmitted to the tip 4 together. On the other hand, the switching portion 5A transmits the reaction force from the distal end portion 4 to the gripping portion 2, but does not transmit it to the driving portion 3. As shown in FIG. Therefore, in the first mode, the first rotational driving force is transmitted from the driving portion 3 to the distal end portion 4 , but the reaction force is not transmitted from the distal end portion 4 to the driving portion 3 . On the other hand, in the second mode, the second rotational driving force is transmitted from the driving portion 3 to the tip portion 4 and the reaction force is transmitted from the tip portion 4 to the driving portion 3 . Thus, the switching unit 5A switches transmission of the rotational driving force (first rotational driving force or second rotational driving force) and reaction force between the first mode and the second mode.

Next, the torque management section 5B is composed of a first cam 53, a second cam 54, a cam biasing section 57, and a torque adjusting screw 58. As shown in FIG. The contact portion between the first cam 53 and the second cam 54 has a chevron shape in which a plurality of contact portions protrude in the front-rear direction and are formed in the circumferential direction. The protrusion 531) engages with the other recess. Therefore, it is possible to prevent the second cam 54 from being displaced from the first cam 53 in the circumferential direction. On the other hand, when the second cam 54 is displaced in the circumferential direction with respect to the first cam 53, the force that tends to rotate the first cam 53 is applied to the second cam 54 at the contact portion by the mountain shapes running over each other. is converted into a force that moves forward.

The set torque of the torque management section 5B corresponds to the force of extension of the cam biasing section 57 (that is, the force that suppresses the forward movement of the second spindle lock 52). Therefore, by turning the torque adjusting screw 58 to change the longitudinal dimension of the cam biasing portion 57, it is possible to easily change the set torque even at the site where the tightening work is performed. When the set torque is exceeded, the mountain-shaped shapes slide over the mountain at the contact portion of the first cam 53 and the second cam 54, and the first cam 53 and the second cam 54 idle. Therefore, the rotational driving force (second rotational driving force) exceeding the set torque is no longer transmitted to the distal end portion 4 .

When the torque adjusting screw 58 is turned, the torque adjusting screw 58 moves forward and backward due to the action of the front threaded portion. A plate-shaped torque indicator 59 is arranged in a groove formed on the inner surface of the main body housing 6, and a screw portion 591 corresponding to the rear screw portion is formed on the inner surface. Therefore, the torque indicator 59 moves in the front-rear direction along the groove. Numerical values and scales are marked on the surface 592 of the torque indicator 59, and the user can confirm the set torque from the numerical values on the torque indicator 59 appearing in the display window 61 provided on the side surface of the main body housing 6. . The amount of movement of the torque indicator 59 in the front-rear direction per one rotation of the torque adjusting screw 58 can be set by the thread pitch of the rear threaded portion of the torque adjusting screw 58 . Therefore, for example, if the torque indicator 59 is set to move greatly when the set torque difference is small, fine adjustment of the set torque is facilitated.

Although the embodiments have been described above, the present invention is not limited to the above embodiments, and various modifications are possible without departing from the gist of the present invention.

For example, the rotary tool 1 of the above embodiment has a substantially T-shaped outer shape, but is not limited to this, and may have a straight bar shape or a substantially L-shaped shape when viewed from the side. Not limited.

Moreover, the switching unit 5A is not limited to the configuration of the above embodiment, and can be configured in various ways. For example, it is possible to adopt a configuration in which a projection formed in a single inclination in the circumferential direction and a steel ball are combined. In this configuration, when the driving portion 3 is driven, the first rotational driving force of the driving portion 3 is transmitted to the tip portion 4 by meshing the projection and the steel ball. On the other hand, when turning by hand, the projection and the steel ball are displaced (slipped), so that the reaction force from the tip portion 4 is not transmitted to the driving portion 3, and the second rotational driving force input to the grip portion 2 is transferred to the tip portion 4. transmitted.

Further, for example, two cams each having a projection formed on the end face with a single inclination in the circumferential direction may be combined so that the projections face each other. In this configuration, both of the two cams rotate when the driving portion 3 is driven, so that the first rotational driving force of the driving portion 3 is transmitted to the distal end portion 4 . On the other hand, when turning by hand, only the front cam rotates, and the rear cam slides against the front cam. A rotational driving force is transmitted to the distal end portion 4 .

DESCRIPTION OF SYMBOLS 1... Rotary tool 2... Grip part 3... Drive part 4... Tip part 5A... Switching part 5B... Torque management part 6... Main body housing 21... Drive switch 22... Forward/reverse switch 23... Lighting unit 31 Motor 32 Gear unit 33 Output shaft 34 Battery 41 Engaging tool 51 First spindle lock 52 Second spindle lock 53 First cam 54 Second 2 cams 55 pin 56 intermediate shaft 57 urging portion (cam urging portion) 58 torque adjusting screw 59 torque indicator 61 display window 511 concave portion 521 projection 522 Flat surface 523 Curved surface 531 Protrusion 581 Tool engagement portion 582 Stepped portion 583 Front threaded portion 584 Rear threaded portion 591 Threaded portion 592 Surface C Tip Chip H Tip holder, S...Screw, L...Rotational axis

Claims (9)

A rotating tool used for tightening screws,
a drive unit that generates a first rotational driving force;
a gripping portion that receives input of the second rotational driving force;
a distal end located on one end side of a rotational axis extending in the front-rear direction and transmitting the first rotational driving force or the second rotational driving force to the screw;
a switching unit for switching between a first mode in which the first rotational driving force is transmitted from the driving portion to the distal end portion and a second mode in which the second rotational driving force is transmitted from the grip portion to the distal end portion; ,
In the second mode, a torque that is interposed in the transmission path of the second rotational driving force and limits transmission of the second rotational driving force to the tip portion when the second rotational driving force exceeds a set torque. management department and
with
The torque management unit
an urging portion that can expand and contract in the front-rear direction;
a torque adjustment unit that adjusts the set torque via the biasing unit,
The torque adjustment section is a rotary tool located in the front-rear direction of the switching section . 2. The method according to claim 1, wherein in the second mode, transmission of the second rotational driving force to the distal end portion is restricted when the second rotational driving force exceeding the biasing force of the biasing portion is applied. Rotary tool as described. The rotary tool according to claim 1 or 2, wherein in the first mode, the first rotational driving force is directly transmitted from the drive section to the tip section. The rotary tool according to any one of claims 1 to 3, wherein said gripping portions are provided so as to extend to opposite positions across said rotation axis. The rotary tool according to any one of claims 1 to 4, wherein the grip portion has an illumination portion whose optical axis faces the tip of the tip portion. The rotary tool according to any one of claims 1 to 5, wherein the torque adjusting portion is located closer to the one end side than the switching portion. The rotary tool according to any one of claims 1 to 6, wherein the switching section is located closer to the one end side than the driving section. The rotary tool further comprises an intermediate shaft fixed to the tip,
The switching unit is
a first spindle lock rotated by the first rotational driving force;
a second spindle lock fixed to the intermediate shaft;
a cam rotated by the second rotational driving force;
with
In the first mode, the first spindle lock is engaged with the second spindle lock to transmit the first rotational driving force to the second spindle lock;
The rotation according to any one of claims 1 to 7, wherein in the second mode, the cam engages with the second spindle lock to transmit the second rotational driving force to the second spindle lock. tool. 9. The rotary tool according to claim 8, wherein said first spindle lock is located in said longitudinal direction of said cam.

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