JPS646205Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bolt tightening tool that grips a bolt supplied into a main body and tightens it using a driving force such as air.

As shown in FIG. 1, the conventional bolt tightening tool includes a main body 1 having a built-in air motor (not shown), and a spring 3 slidably inserted into the distal end of the main body 1.
The cylindrical portion 2 is pressed by the cylindrical portion 2, the expandable and retractable gripping mechanism 4 grips and guides the bolt a formed at the tip of the cylindrical portion 2, and the bolt a provided from a bolt feeding mechanism (not shown) is transferred to the bolt supply pipe. a guide hole 6 provided in the tip of the cylindrical portion 2 for receiving one from 5 and guiding it to the gripping mechanism 4; a rotating shaft rotated by the air motor and having a fitting hole 7a for a bolt head on the tip side; 7. It consists of a push rod 9 of a bolt a that is slidably inserted into the center hole of the rotating shaft 7 and whose tip is projected toward the guide hole 6 side by a spring 8.
When the handle 1a provided on the main body 1 is grasped and the gripping mechanism 4 at the tip of the cylindrical part 2 is pressed against a bolt threaded part (not shown), the main body 1 is pushed against the cylindrical part 2 against the spring 3.
slides toward the cylindrical portion 2 side, the rotating shaft 7 moves forward into the guide hole 6 to the left in the figure along with the push rod 9 inside the cylindrical portion 2, and the bolt is supplied from the bolt supply pipe 5 and received into the guide hole 6. Initially, the head of the bolt a is pushed with the push rod 9 so that it is gripped by the gripping mechanism 4 as shown in the figure, and the push rod 9 sinks into the fitting hole 7a against the spring 8, and the head of the bolt a is pushed into the fitting hole 7a.
Since the head of the bolt a is fitted inside, the air motor is activated by the operation button 1b to rotate the rotating shaft 7, and the structure is such that the bolt a shown in the figure is screwed into a bolt threading part not shown. .

However, in the bolt tightening tool described above, the bolt a fed into the guide hole 6 is tilted due to the push rod 9 protruding from the center of the fitting hole 7a of the rotating shaft 7, and the bolt a is pushed into the gripping mechanism 4. This may impede the advancement of the bolt a and the fitting of the bolt head into the fitting hole 7a, and furthermore, the bolt a may become trapped in the guide hole 6 and become inoperable. It is troublesome to take out the bolts trapped inside, the push rod 9 and the fitting hole 6 are easily damaged, and these parts cannot be replaced.

The present invention is a bolt tightening tool developed to address the above-mentioned difficulties, and includes a bolt guide hole communicating with a bolt supply pipe and a bolt gripper disposed at the tip of the guide hole. a main body front portion provided with a mechanism; a main body base fitted into the proximal end portion of the main body front portion; a fitting groove provided on the outer surface of the proximal end portion of the main body front portion; and a hole provided in the main body base portion; a main body front attachment/detachment mechanism in which a steel ball is fitted into the fitting groove and the hole, and a detachment/detachment operation ring is slidably fitted on the outside of the steel ball and the main body base; and a base end of the main body base. a rotation mechanism including a drive source and a rotation transmission shaft built into the main body base, and a rotation mechanism built into the intermediate portion or the tip of the main body base and connected to the rotation drive shaft so as to be able to slide only so as to rotate and slide. A first air chamber and a second air chamber partitioned by a rotation/propulsion shaft and a piston provided between the main body base and the rotation/propulsion shaft.
an air cylinder for advancing and retracting the rotation/propulsion shaft having an air chamber; a cylinder operating mechanism disposed between the air cylinder for advancement and retreat and the operation handle on the outside of the base of the main body; and a spring at the tip of the rotation/propulsion shaft. a bolt supply control mechanism disposed between the main body base and the rotation/propulsion shaft and emitting a bolt supply signal when the rotation/propulsion shaft is in a retracted position; Its purpose is to improve the supply position of the bolt into the guide hole at the front of the main body, the fitting of the bolt head, screwing performance, tightening operation performance, and work performance. To provide an improved bolt fastener.

The present invention has the above-mentioned configuration, and the operation handle attached to the base of the main body is grasped, the gripping mechanism at the tip is placed in the screwed hole, and the rotation transmission shaft of the rotation mechanism is used to operate the operation handle. When the rotation/propulsion shaft is driven to rotate and the air cylinder for advance/retraction is operated by the cylinder operating mechanism to advance the rotation/propulsion shaft into the guide hole, it will fit into the fitting hole provided at the tip of the rotation/propulsion shaft. The bolt head fits in the guide hole, the bolt is propelled and rotated, is gripped and guided by the gripping mechanism, and is easily and quickly screwed into the screwed hole, and the air cylinder for advancing and retracting is reversely operated. is retracted into the base of the main body of the rotation/propulsion shaft, and at the retracted position, the bolt supply control mechanism operates and issues a bolt supply signal.The bolt supply mechanism is operated by the bolt supply signal, and then the bolt is guided. By being supplied into the hole, the retraction of the rotation/propulsion shaft and the bolt supply are synchronized in a timely manner, and the position of the bolt in the guide hole is accurate and the fitting of the bolt head is ensured.

In other words, since the socket into which the bolt is fitted is biased toward the bolt by the spring, the cushioning function of the spring allows for smooth fitting of the socket onto the bolt.
Since the socket slides by supplying air to the two air chambers, the socket slides smoothly, has a simple structure, and is easy to assemble. The front part of the main body can be easily removed with one touch, and sufficient fixing force can be obtained.Furthermore, the bolt supply mechanism can supply bolts efficiently and properly by detecting the retraction of the rotation/propulsion shaft. This has the effect of improving bolt threading performance and operational reliability.

An air cylinder for advancing and retracting is provided in the base of the main body, and a cylinder operating mechanism is provided between the operating handles, and the internal rotation/propulsion shaft slides with respect to the base of the main body. This greatly simplifies the process, making it easier to hold the main body and place it in the screw hole, improving operational performance and tightening efficiency.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 2 and 3 A, B, and C. In FIG. a gripping mechanism consisting of a plurality of gripping claws 21 and a tightening ring 23 for gripping and guiding the bolts; The bolt tightening tool has an air supply for sequentially transferring the bolts a to the bolt supply pipe 18 using air. and a unit U that supplies air to the switching valve 42 operated by the operating rod 43 and to the air motor 30, and the air supply for bolt transfer in the unit U is connected to the micro switch 50. The unit U is connected to an air source F and a power source E via a pressure control device C and an on-off valve V.

Furthermore, FIG. 3 shows the structure of the present invention, and the front of the main body 10 is equipped with a guide hole 19 for the bolt a communicating with the bolt supply pipe 18 and bolt gripping mechanisms 21 and 23 disposed at the tip of the guide hole. , a main body 10 base connected to the base end of the front part of the main body, and rotation mechanisms 30 to 33 including drive sources 30, 31 and rotation transmission shafts 32, 33 built into the base end of the main body base.
and rotation/propulsion shafts 34, 35, 36 which are built into the intermediate portion or the tip of the base of the main body, are slidably connected to the rotation transmission shafts 32, 33, and rotate and slide.
and a guide hole 1 provided at the tip of the rotation/propulsion shaft.
The fitting hole 36b of the bolt head in 9, and the air cylinder 34a for advancing and retracting the rotation/propulsion shaft provided between the base of the main body 10 and the rotation/propulsion shafts 34, 35, 36,
b, 39a, b, 40a, b, and cylinder operating mechanisms 41a, b, 42, disposed between the advance/retreat air cylinder and the operating handle 11 on the outside of the base of the main body 10.
42a, 43, the base of the main body 10 and the rotation/propulsion shaft 3
Bolt supply control mechanisms 50, 50a, 51, 52 are disposed between 4, 35, and 36 and emit a bolt supply signal into the guide hole 19 when the rotation/propulsion shaft is in the retracted position.
It is a bolt tightening tool equipped with

To explain the bolt tightening tool in more detail, the main body 10 shown in FIG. 2 consists of a sixth cylindrical main body 10f, which is the front part of the main body 10, and a base part of the main body 10, as shown in FIG. , a first cylindrical body 10a having a cap incorporating an air motor 30, and a first cylindrical body 10a having a built-in impact hammer 31 for applying impact.
A second cylindrical body 10b fixed to the cylindrical body 10a.
, a third cylindrical body 10c screwed to the second cylindrical body 10b, a fourth cylindrical body 10d screwed to the third cylindrical body 10c, and a screwed etc. to the fourth cylindrical body 10d. The fifth cylindrical main body 10e is fixed to the fifth cylindrical main body 10e, and the sixth cylindrical main body 10
f are removably connected, a grip handle 11 is attached to the fourth cylindrical body 10d, and a fifth
A small diameter part provided at the tip of the cylindrical body 10e, a steel ball 12 loosely fitted in a hole provided in the small diameter part, a spring 13 disposed on the outer periphery of the small diameter part, and a slidably fitted part on the outer periphery of the small diameter part. The attachment/detachment operation ring 16 has a protrusion 16a into which the steel ball 12 is inserted and is prevented from coming out by the ring 15, and the fitting groove 17 for the steel ball 12 provided on the outer periphery of the base side of the sixth cylindrical body 10f. Become,
A sixth cylindrical body 10 is provided on the distal end side of the fifth cylindrical body 10e.
An insertion mechanism is provided for removably inserting the base side of f. Note that the spring 13 biases the attachment/detachment operation ring 16 toward the left in the figure with respect to the fifth cylindrical main body 10e.

That is, the insertion mechanism includes a gripping mechanism (gripping claw 2
1), a sixth cylindrical main body 10f having a guide hole 19 and a bolt supply pipe 18, that is, the front part of the main body 10, is detachably inserted into the sixth cylindrical main body 10f.

Further, as described above, the bolt supply pipe 18 is diagonally connected to the sixth cylindrical body 10f, and a guide hole 19 communicating with the bolt supply pipe 18 is formed. At the tip, the bases of a plurality of gripping claws 21 are arranged at equal intervals in the circumferential direction within a small diameter portion provided on the outer periphery of the tip, a tightening ring 22 is fitted into the base, and a tightening ring 23 is screwed into the large diameter portion. 3A, the threaded portion of bolt a is gripped and guided by the screw gripping portion on the tip side of each gripping claw 21, and the spring that can be expanded to the dotted line position is attached. A gripping mechanism is provided which grips and guides the bolt a, which is formed of a plate and allows the bolt head and socket 36 to pass through.

Furthermore, the propulsion/rotation mechanism for the bolt a built in the main body of the bolt tightening tool includes drive sources 30, 31 and a rotation transmission shaft 32, as shown in FIG.
33, rotation/propulsion shafts 34, 35, 36, advance/retreat air cylinder 34a,
b, 39a, b, 40a, b, and cylinder operating mechanisms 41a, b, 42, 42a, 43, and to describe the rotation mechanism and the rotation/propulsion shaft in detail, the air motor 30 in the first cylindrical body 10a, an impact hammer 31 within the second cylindrical body 10b;
a rotating shaft 32 rotated by an air motor 30;
A square hole 33a on the base side of the square head 32a at the tip of the rotation shaft 32 is fitted into the rotation transmission shaft 33, which has a rectangular outer periphery and is connected to the rotation transmission shaft 33 by a pin. a cylindrical first socket 34 with a circular outer circumference, a joint rod 35 with a circular outer circumference in which a circular base 35a is fitted to the tip of the first socket 34;
A square base side hole 36a is provided at the square tip 35b of the connecting rod 35.
A second socket 36 that is fitted into the second socket 36 and slidably connected to the second socket 36 over the range of the long hole by a long hole and a pin, a spring 37 that pushes out the second socket 36, and a bolt provided on the tip side of the second socket 36. It is equipped with a fitting hole 36b into which the head of the rotating shaft 32 is fitted, and a magnet 38 buried in the bottom of the fitting hole 36b.
At the tip of the propulsion/rotation shaft consisting of the rotation transmission shaft 33 and the first socket 34, there is a circular bolt drive shaft consisting of the second socket 36 with a fitting hole 36b for fitting the bolt head at the tip and the joint rod 35. The base portion 35a is arranged in a row, and the fitting hole 36b side of the bolt drive shaft is inserted into the sixth cylindrical main body 10f, that is, into the front part of the main body.

Further, to explain in detail the advancing/retracting air cylinder and the cylinder operating mechanism, the fourth cylindrical main body 10
A transverse annular cylinder is formed between the first socket 34 and the first socket 34, and the projection 34a of the first socket 34 and the stop ring 3 screwed therein are connected to the first socket 34.
A piston 39 and a spring 39a are fitted between the piston 39 and the spring 39a.
The air cylinder is configured as an air cylinder divided into an air chamber 40a and a second air chamber 40b, and an air supply path 41a communicating with the first air chamber 40a and an air supply path 41b communicating with the second air chamber 40b are not shown. The air switching valve 42 is connected to the air switching valve 42 through a pipe, and the operating rod 43 (attached to the grip handle 11) is connected to the switching rod 42a of the switching valve 42.
a is in contact with the switching valve 4 by the operating rod 43.
2, the air supplied from the unit U shown in FIG. 2 can be alternately switched and supplied to the first air chamber 40a via the air supply path 41a or to the second air chamber 40b via the air supply path 41b. It's structured.

Furthermore, to explain the bolt supply control mechanism in detail, as shown in FIG. 3A, the first socket 34
A recess 52 is formed on the outer periphery of the portion between the distal end side of the fifth cylindrical body 1 and the joint rod 35 fitted therein, and the fifth cylindrical body 1
An operating rod 50a, which is disposed at 0e so as to be movable in the radial direction and is biased by a spring, engages the recess 52 through the steel ball.
The fifth cylindrical body 10e is attached to the fifth cylindrical body 10e.
A micro switch 50 provided on the inner surface of a protrusion 51 screwed into the micro switch 50 is provided opposite to the outer end of the operating rod 50a, and when the recess 52 is at the position of the operating rod 50a, the operating rod 50a enters the recess 52. The micro switch 50 turns on and issues a bolt supply signal,
A bolt a is inserted into the guide hole 19 through the bolt supply pipe 18.
is now being supplied.

The illustrated embodiment has the above-described structure, and in the state shown in FIG. 3A, when the operating rod 50a enters the recess 52 at the end of the retraction of the connecting rod 35 and the micro switch 50 is turned on, the bolt is supplied. A bolt a is supplied from the pipe 18 into the guide hole 19,
The rotary shaft 32 is gently rotated by the air motor 30 and the impact hammer 31 and a moderate impact is applied, the rotation transmission shaft 33 is rotated, and the second socket 36 is accordingly rotated via the first socket 34 and the joint 35. At the same time, when the operating rod 43 is pressed to switch the switching valve 42 and air is supplied from the switching valve 42 to the second air chamber 40b of the air cylinder via the air supply path 41b, the first air chamber 40a
Since the side is exhausted, the piston 39 propels the first socket 34, the joint rod 35, and the second socket 36 to the left side in the figure in a rotating state, and the fitting hole 36b of the second socket 36 engages the bolt in the guide hole 19. The head of bolt a is fitted and moved forward, and the bolt a is rotated and propelled into the screw gripping portion on the tip side of each gripping claw 21 of the gripping mechanism, and the screw portion is gripped, and the bolt a is held in a stable position (not shown). Can be screwed into the bolt hole of Further, the head of the bolt a can be easily passed through by expanding each gripping claw 21 (dotted line) as shown in FIG. 42 is switched, the first air chamber 40 is switched through the air supply path 41a.
Air is supplied to the a side, and the piston 39
socket 34, joint 35 and second socket 36
is pulled toward the right side in the figure, and as shown in FIG. 3A, is retreated out of the guide hole 19 and held. At this time, the operating rod 50a is lowered to the recess 52 side via the steel ball, so the micro switch 50 is temporarily turned on, and the bolt a is fed from the bolt supply pipe 18 through the guide hole 19 into the gripping claw 21. The next tightening position will occur.

Therefore, in the embodiment, the first cylindrical body 10a, the second cylindrical body 10b, and the third cylindrical body 1
0c, the fourth cylindrical body 10d and the fifth cylindrical body 1
The front part of the sixth cylindrical body 10f is attached to the main body base part 0e by an insertion mechanism consisting of a steel ball 12, a spring 13, an attachment/detachment operation ring 16 with a protrusion 16a, a ring 15, and a fitting groove 17. Since it is removably inserted, in the state shown in FIG.
Since the steel ball 12 released from a comes out from the fitting groove 17, the sixth cylindrical body 10f, that is, the front part of the body, can be easily removed, preventing bolts from being trapped in the guide hole 19, interference from foreign objects, etc. The sixth cylindrical body 10f can be easily removed, and the sixth cylindrical body 10f can be inserted into the distal end side of the fifth cylindrical body 10e at the base of the main body.
When released, it will look like the illustration and can be easily inserted.

In addition, by changing the insertion angle of the sixth cylindrical body 10f with respect to the fifth cylindrical body 10e and the insertion angle of the joint 34 with respect to the first socket 34, the bolt can be adjusted according to the usage state of the bolt tightening tool. The position of the supply pipe 18 can be changed, and the bolt supply pipe 18 can be prevented from interfering with the bolt tightening operation.

In the above embodiment, the explanation has been made regarding the tightening of bolts, but the present invention can also be applied to tightening screws, etc., which are equivalent to bolts.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing a conventional bolt fastener;
Figure 2 is a schematic explanatory diagram showing an example of the present proposal;
Figure A is a longitudinal cross-sectional view showing the bolt fastener of the embodiment of the present invention, Figure 3B is a cross-sectional view taken along the line BB in Figure 3, and Figure 3C is a cross-sectional view taken along the line CC in Figure 3A. a: Bolt, 10a...e: Body base, 10f:
Front part of main body, 11: Operation handle, 12: Steel ball, 1
6: Attachment/detachment operation ring, 17: Fitting groove, 18: Bolt supply pipe, 19: Guide hole, 21, 23: Gripping mechanism, 3
0, 31: Drive source, 32, 33: Rotation transmission shaft, 3
6: socket, 37: spring, 34, 35,
36: Rotation/propulsion shaft, 36b: Fitting hole, 34a,
b, 39a, b, 40a, b: Advance/retreat air cylinder, 39: Piston, 40a, 40b: First air chamber, second air chamber, 41a, b, 42, 42a, 4
3: Cylinder operation mechanism, 50, 50a, 51, 5
2: Bolt supply control mechanism.

Claims (1)

[Scope of utility model registration request] A main body front portion including a bolt guide hole communicating with the bolt supply pipe and a bolt gripping mechanism disposed at the tip of the guide hole, and a main body base fitted into the proximal end portion of the main body front portion. , a fitting groove is provided on the outer surface of the proximal end of the front part of the main body, a hole is provided in the main body base, and a steel ball is fitted into the fitting groove and the hole, and the outside of the steel ball and the main body base is provided. a main body front attachment/detachment mechanism in which an attachment/detachment operation ring is slidably fitted, a rotation mechanism equipped with a drive source and a rotation transmission shaft built into the base end of the body base, and an intermediate portion of the body base. A rotary shaft is built in the tip and is connected to the rotary drive shaft so that it can only slide, and rotates and slides.
a propulsion shaft; an air cylinder for advancing and retracting the rotation and propulsion shaft having a first air chamber and a second air chamber partitioned by a piston provided between the main body base and the rotation and propulsion shaft; and the air cylinder for advancing and retreating the rotation and propulsion shaft. a cylinder operating mechanism disposed between the cylinder and the operating handle on the outside of the main body base; a socket having a fitting hole for a bolt head connected to the tip of the rotation/propulsion shaft via a spring; and the main body. A bolt tightening tool characterized by comprising a bolt supply control mechanism disposed between the base and the rotation/propulsion shaft and emitting a bolt supply signal when the rotation/propulsion shaft is in a retracted position.