JPH0748371Y2 - Screw tightener - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tightening tool used for tightening and loosening screws such as bolts and screws.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Laid-Open No. 57-18961, the prior art is a sun gear fixed to the central axis of a handle, a driver main body having a planetary gear meshing therewith, and a planetary gear. It is composed of a grip cylinder provided with an internal gear that meshes with the gear, and by rotating the handle by gripping the grip cylinder with a hand, the planetary gear mechanism consisting of each of the gears causes the driver body to decelerate and rotate to rotate the screw. There is a deceleration driver for tightening the screw and a screw fastener having a configuration reverse to the above described in Japanese Utility Model Laid-Open No. 62-29265.

[0003]

[Problems to be Solved by the Invention] The above-mentioned Japanese Utility Model Laid-Open No. 57-18
The conventional technique disclosed in Japanese Patent Publication No. 961 is limited to the actual opening 62 when the loosening work when the tightening is hard and the deceleration tightening for preventing the plus groove of the head from being damaged during the screw tightening work that requires precise adjustment. The technology described in Japanese Patent No. 29265 is limited to tightening or speed-up tightening for the purpose of improving the efficiency of the loosening work time. In the former case, the normal tightening and the loosening work take a waste of time, and , In the latter case,
As the tightening progresses, a larger load will be applied to the handle, making it impossible to perform reliable tightening, and it is also not suitable for loosening work in the case of hard tightening, and both technologies only have weak points. Instead, other tightening tools will be used during normal tightening work.

The present invention provides a tightening tool capable of addressing the problems of the prior art.

[0005]

[Means for Solving the Problems] A fastener for a screw for achieving the above object is mainly a fastener having a handle fixed,
A gear casing that rotates around the center of rotation of the handle and a tool shaft are arranged in series.The tool shaft has a bit that fits into and disengages from the object to be fastened at the tip, and the base end is driven by the gear casing. A gear is fixed, and the gear casing transmits a rotation of the handle to the driven gear at a constant speed through the connecting shaft, and a planetary gear, internal teeth, and the sun gear to increase the speed to the driven gear. The planetary gear speed-increasing mechanism and the speed reducing mechanism that transmits the speed reduction to the driven gear through the sun gear and the reduction gear are internally provided, and the fastener main body is each ratchet gear that is axially supported by the rotating shaft of each mechanism. A ratchet pawl that is engaged and disengaged with the ratchet pawl is provided, and a switching mechanism that engages and disengages the ratchet pawl to change the tightening and loosening rotation directions of the handle and to select each of the above mechanisms is provided.

[0006]

The ratchet pawl that engages and disengages each ratchet gear is engaged and disengaged by the switching mechanism to change the tightening, loosening, and rotating direction, and at the same time, the desired speed can be selected among the constant speed, speed increasing, and speed decreasing mechanisms according to the work purpose. Select the mechanism, fit the bit of the tool shaft into the tightened body, rotate the handle, and tighten and loosen.

[0007]

[Effects of the Invention] Since the tightening device can change not only the tightening / relaxing rotation direction but also the variable speed rotation by operating the switching mechanism, it can handle any work and is highly workable.

[0008]

FIG. 1 shows an embodiment of a screw tightening tool according to the present invention.
It will be described with reference to FIG. Reference numeral A in the drawing is a fastener,
A gear casing 3 and a tool shaft 4 which sequentially rotate about the rotation center of the handle 1 are arranged in series in a fastener main body 2 in which a handle 1 is fitted and fixed to the upper portion, and the tool shaft 4 is inside the gear casing 3. A bit holder 6 is fixedly mounted on a driven gear 5 located at, and a bit B that fits in and out of a groove of a body to be fastened is attached to a tip of the bit holder 6, and a gear casing 3 fixes a rotation of a handle 1 for fastening a tool shaft 4. A constant speed mechanism C for transmitting to the driven gear 5 provided, a speed reduction mechanism D, and a planetary gear speed increasing mechanism E are installed internally, and a switching mechanism for selecting each of the mechanisms C to E as the fastener main body 2. F is arranged.

In the constant velocity mechanism C, the shaft rod 9'of the constant velocity ratchet gear 9 is inserted into the center hole 7 of the fastener main body 2 through the bearing 8 and the connection is established along the rotation center of the handle 1. The shaft 10 is continuously provided, and the other end of the connecting shaft 10 is connected to the tool shaft 4
It is fixed to the driven gear 5.

The speed reduction mechanism D includes a hollow portion 1 of the cylindrical shaft 11.
A connecting shaft 10 is rotatably fitted in 1 ', a reduction ratchet gear 12 disposed below the constant velocity ratchet gear 9 is fixed to the upper end, and a sun gear 13 is provided around the lower outer periphery to form a gear casing 3 It is housed inside and also has a gear casing 3
The support plate 14 fixed in the middle and the bottom 3'of the gear casing 3 are vertically provided with shaft rods 14 ', 14' to axially support a pair of stepped reduction gears 15. The large diameter gear portion 16 meshes with the sun gear 13, and the small diameter gear portion 17 meshes with the driven gear 5 of the tool shaft 4.

In the planetary gear speed increasing mechanism E, the cylindrical shaft 11 is provided in a hollow portion 19 'of a shaft cylinder 19 having a support plate 18 at a lower end thereof.
A speed-increasing ratchet gear 20 positioned below the reduction ratchet gear 12 is provided around the upper end of the shaft cylinder 19, and the support plate 18 is rotatably fitted in the gear casing 3. The sun gear 13 is provided by vertically arranging 18 'and 18'.
A plurality of planetary gears 21 and 21 that mesh with each other. Each planetary gear 21 and 21 meshes with internal teeth 22 that are provided around the inner wall of the gear casing 3. The constant speed ratchet gear 9 and the deceleration ratchet gear 12 The speed-increasing ratchet gear 20 is vertically installed in the recess 2 ′ of the fastener main body 2 in a state of overlapping.

In the switching mechanism F, the ratchet cover 23 that closes the recess 2'of the fastener main body 2 is provided with a guide hole 23 ', and a lever 24' projecting on the surface of the operation plate 24 is slidably fitted to the edge of the ratchet cover 23. The selection display 25 for displaying the operation position by the movement of the lever 24 'is shown. The selection display 25 shows the rotation direction of the handle 1 with the tightening side 26 on the left side and the relaxation side 26' on the right side as shown in FIG. , Each tightening 26, relaxation side 2
6'displays the operating positions of acceleration 27, 27 'and deceleration 28, 28', respectively. Further, each of the ratchet gears 9, 12, 2 arranged in parallel with each other in the recess 2'of the fastener main body 2 is arranged.
Stepped surfaces 29, 29 are provided on the both-side fastener main body 2 of 0,
The step surface 29 is composed of a hill portion 29 ′, a valley portion 29 ″, and a step portion 30 which is a boundary between the hill portions 29 ′ and the valley portion 29 ″.
Ratchet claw 3 which is engaged with and disengaged from each ratchet gear 9, 12, 20 based on 7, 27 'and deceleration 28, 28'.
1, 32, 33 are arranged for each pair of left and right so as to swing around the step portion 30 as a fulcrum, and each ratchet pawl 31, 3 is provided.
2, 33 are pressed toward the step surface 29 at the pressing point 34 'of the plate spring 34 fixed to the back surface of the operation plate 24. The step surfaces 29 of the ratchet pawls 31, 33 which are disengaged from the constant-speed ratchet gear 9 and the speed-increasing ratchet gear 20 have a short hill portion 29 'and a long valley portion 29 "(FIG. 7, FIG. 9), the step surface 29 of the ratchet pawl 32 that is disengaged from the reduction ratchet gear 12 has a long ridge 29 ′ and a short valley 29 ″ (FIGS. 8 and 10).
1, 33 and the step portion 30 which is a swing fulcrum of the ratchet pawl 32 are formed so as to be displaced from each other. In this embodiment, the tool shaft 4
Is a so-called doyler bar type consisting of a bit holder with a removable bit B, but a box type is also possible.

This embodiment has the above-mentioned structure. When fastening fastened objects such as bolts and screws, the lever 24 'of the operating plate 24 in the switching mechanism F arranged in the fastener main body 2 is used. Is the speed increase 27 on the tightening 26 side of the selection display 25
With the movement operation to instruct
Of the stepped surfaces 29, 29 of the pair of ratchet pawls 33, 33 which are engaged with and disengaged from the speed increasing ratchet gear 20, the pressing points 34 ', 34' of the leaf spring 34 fixed to the No. 4 move. Ratchet claw 3 that rotates 20 in the tightening direction
The pressing point 34 'on the third side is a hill 29' on the step surface 29.
Since the ratchet pawl 33 is pressed in the state of being positioned at, the ratchet pawl 33 is in a parallel posture and engages with the speed-increasing ratchet gear 20.
Since the other ratchet pawl 33 is pushed in the state of being positioned on 9 ″, the ratchet pawl 33 is inclined and disengaged from the speed increasing ratchet gear 20, and at the same time, the constant speed ratchet gear 9
Step surfaces 29, 29 of the ratchet pawls 31, 31 that are disengaged from the
Is also formed in the same manner as described above, and the ratchet pawls 32, 32 that engage and disengage the reduction ratchet gear 12 are also formed on the step surface 2
9 and 29, the pressing points 34 'and 34' are located in the hill portion 29 'on one side and the valley portion 29 "on the other side, so that the same engagement state as described above is exhibited (FIGS. 7 and 8). After the lever 24 'is moved, the bit B is fitted into the tightened body, the gear casing 3 is gripped and fixed, and the handle 1 is rotated in the tightening direction.
0 rotates with the handle 1 while being pushed by the ratchet pawl 33, and the planetary gear 2 axially supported on the support plate 18 of the shaft cylinder 19
1, 21 and the planetary gear speed-up mechanism E composed of the internal gear 22 and the sun gear 13 in a stopped state by gripping the gear casing 3, the sun gear 13 is accelerated and rotated, and the large-diameter gear portion 16 of the stepped reduction gear 15 is rotated. , Reaches the driven gear 5 via the small-diameter gear portion 17, and the bit holder 6, the bit B, that is, the tool shaft 4 is rotated at an increased speed in the tightening direction. At this time, the constant velocity ratchet gear 9 with which the ratchet pawl 31 is engaged is rotated by the rotation of the driven gear 5 via the connecting shaft 10, and the deceleration ratchet gear 12 with which the ratchet pawl 32 is engaged is also the rotation of the sun gear. However, the ratchet gears 9 and 12 do not participate in the above-described speed-up tightening rotation because the ratchet gears 9 and 12 push up the engaged ratchet pawls 31 and 32 in the disengagement direction to increase the speed.

When the object to be tightened is decelerated and tightened, the lever 24 'is moved so as to instruct the deceleration 28 of the tightening side 26, so that the pressing points 34', 3 of the leaf spring 34 are pressed.
Reference numeral 4'denotes a step surface 29, 29 of a pair of ratchet pawls 33, 33, which is engaged with and disengaged from the speed increasing ratchet gear 20, both of which are located on the valley-shaped portion 29 ".
33 is pushed to make it in an inclined posture so that it is disengaged from the speed increasing ratchet gear 20 and the constant speed ratchet gear 9
The ratchet pawls 31 and 31 that engage and disengage with each other also exhibit the same disengaged state (FIG. 9), and the step surfaces 29 and 29 of the pair of ratchet pawls 32 and 32 that engage and disengage with the reduction ratchet gear 12 have the hill shape as described above. Since the portion 29 'is formed to be long, the ratchet pawl 32 is pressed while the pressing point 34' on the ratchet pawl 32 side for rotating the reduction ratchet gear 12 in the tightening direction is located on the hill portion 29 '. Since it is in the parallel posture, it engages with the reduction ratchet gear 12, and on one of the step surfaces 29, it is positioned on the valley portion 29 ″ and presses the ratchet pawl 32, so that it takes an inclined posture and disengages from the reduction ratchet gear 12 (see FIG. 10) When the handle 1 is rotated in the tightening direction while the gear casing 3 is being held after the lever 24 'is moved, the deceleration ratchet gear 12 ratchets. The driven gear is rotated together with the handle 1 while being pressed by the claw 32, and is driven by the sun gear 13 provided around the tubular shaft 11 via a reduction mechanism D including a large-diameter gear portion 16 and a small-diameter gear portion 17 of a stepped reduction gear 15. 5, the bit holder 6, the bit B, that is, the tool shaft 4 is decelerated and rotated in the tightening direction, in which case the constant speed ratchet gear 9 and the driven gear 5 are also rotated.
The rotation of the sun gear 13 causes the planetary gears 21 to rotate by the rotation of the sun gear 13.
Although it rotates through 21, the pair of ratchet pawls 31 and 32 that are engaged and disengaged with each other are in a disengaged state and do not participate in the deceleration tightening rotation.

When the object to be tightened is tightened at a constant speed, that is, when the handle 1 and the tool shaft 4 are tightened and rotated at the same rotation angle, the same operation as in the case of quickly tightening the object to be tightened is performed (FIG. 7, FIG. 7). 8), in which the handle 1 is rotated in the tightening direction without gripping the gear casing 3,
The constant velocity ratchet gear 9 rotates in the tightening direction together with the handle 1 while being pushed by the ratchet pawl 31, so that the connecting shaft 10,
A constant-speed mechanism C composed of the driven gear 5 and the tool shaft 4 performs constant-speed tightening rotation. At this time, the speed-increasing ratchet gear 20 and the deceleration ratchet gear 12 are also engaged with each ratchet pawl 3
The gear casing 3 rotates by being pushed by 2, 33.
Since the handle 1 is rotated without gripping the gear, the planetary gear speed-increasing mechanism E and the speed-reducing mechanism D do not perform gear transmission, and therefore do not participate in the constant-speed tightening rotation.

When the object to be fastened is rotated in the direction of relaxation in a uniform speed, deceleration or acceleration, the lever 24 'of the operation plate 24 instructs the acceleration side 27' or deceleration 28 'on the relaxation side 26' in the same manner as described above. After such a moving operation, the loosening rotation is performed.

According to the tightening tool shown in the embodiment, by moving the lever of the operation plate in accordance with the selection display, not only the tightening / loosening rotation direction can be changed but also the tool shaft, that is, the bit can be rotated at a variable speed. Since it is possible to deal with all kinds of tightening and loosening work such as difficult tightening of screws, loose tightening at the beginning of tightening, and normal tightening, the workability is excellent.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a screw tightening tool according to the present invention.

FIG. 2 is a central longitudinal sectional view of FIG.

FIG. 3 is a sectional view taken along line S-S in FIG.

4 is a sectional view taken along line XX of FIG.

FIG. 5 is a front view of a switching mechanism.

FIG. 6 is a perspective view of a leaf spring.

7 is a cross-sectional view taken along line YY of FIG. 5 in the increased tightening rotation.

8 is a cross-sectional view taken along line ZZ of FIG. 5 in the increased tightening rotation.

9 is a cross-sectional view taken along line YY of FIG. 5 in deceleration tightening rotation.

10 is a cross-sectional view taken along the line ZZ of FIG. 5 in deceleration tightening rotation.

[Explanation of symbols]

 1 Handle 2 Fastening Tool Main Body 3 Gear Casing 4 Tool Shaft 5 Driven Gear 9 Constant Velocity Ratchet Gear 10 Connection Shaft 12 Reduction Ratchet Gear 13 Sun Gear 20 Speed-up Ratchet Gear 21 Planetary Gear 22 Internal Teeth 31, 32, 33 Ratchet Claw A Clamping tool B Bit C Constant velocity mechanism D Reduction mechanism E Planetary gear speed increasing mechanism F Switching mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuhiro Yanagishita Iwabuchi Co., Ltd. 1-2-20 Toranomon, Minato-ku, Tokyo (56) References: 61-99477 (JP, U): 58- 136270 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A gear casing and a tool shaft, which sequentially rotate about the rotation center of the handle, are arranged in series in a fastener main body to which a handle is fixed, and the tool shaft is inserted into and removed from a tightened body at its tip. A bit or the like is provided, and a driven gear located in the gear casing is fixed to the base end, and the gear casing transmits a rotation of the handle to the driven gear at a constant speed through a connecting shaft, a planetary gear and The planetary gear speed-increasing mechanism for increasing speed transmission to the driven gear via the internal teeth and the sun gear, and the speed reducing mechanism for reducing speed transmission to the driven gear via the sun gear and the reduction gear are internally provided. Is a ratchet pawl that is disengaged from each ratchet gear that is rotatably supported by the rotary shaft of each mechanism.
Moreover, a screw tightening tool provided with a switching mechanism for selecting the above-mentioned mechanisms while engaging and disengaging the respective ratchet pawls to change the tightening and loosening rotation directions of the handle.