JPH0742611Y2 - Ratchet spanner - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ratchet spanner used for tightening and loosening bolts and nuts.

[0002]

2. Description of the Related Art A conventional ratchet spanner is a real public sho 40-
As described in Japanese Patent No. 16550, a rotor provided with a socket portion for fitting a nut or the like at an end portion of a rotating handle;
The ratchet gear provided on the rotor is provided with a ratchet pawl that engages and disengages with the ratchet gear to change the rotation direction.

[0003]

In the prior art described above, the ratchet pawl is converted to rotate the ratchet gear in the tightening direction, the socket portion is fitted into the object to be tightened such as a nut, and the rotary handle is rotated. As a result, when the tightened body is rotated in the tightening direction and the turning handle is rotated in the reverse direction, the ratchet gear, that is, the socket portion does not rotate in the reverse direction due to the tightening resistance of the tightened body.
The ratchet claws go over the teeth of the ratchet gear and reversely rotate together with the rotating handle, and this operation is repeated to perform the tightening work. However, at the initial stage of tightening the nuts, etc., when the turning handle is turned in the reverse direction because the tightening is loose, the engagement resistance with which the ratchet pawl is engaged with the ratchet gear is larger than the tightening resistance. The ratchet pawl does not go over the portion and the ratchet gear rotates in the reverse direction with the reverse rotation of the rotating handle, causing the nut to rotate in the direction of loosening.

It is an object of the present invention to provide a ratchet spanner capable of dealing not only with the problems at the initial stage of tightening in the prior art but also with speeding up of tightening work.

[0005]

In order to achieve the above object, the present invention rotatably fits a rotary shaft to a rotary handle of a ratchet spanner, and the rotary shaft has a socket portion on its end surface and an outer peripheral surface. A sun gear is provided around the first ratchet gear, which is fixed around the rotary shaft as an axis, a second ratchet gear that is rotatably fitted, and a grip cylinder.
The ratchet gear axially mounts a plurality of planetary gears that mesh with the sun gear, the grip cylinder has internal teeth that mesh with the planetary gears, and the rotating handle has meshing engagement with each of the first and second ratchet gears. It is provided with ratchet pawls that are separated from each other and change the rotation directions of the two ratchet gears.

[0006]

Operation: The ratchet pawls of the rotating handle are engaged to change the rotation directions of both ratchet gears, the socket is fitted into the object to be tightened, and the rotating handle is rotated to rotate the object to be tightened. Further, by pressing the gripping cylinder and turning the turning handle, the tightened body fitted to the rotary shaft, that is, the socket portion is accelerated and rotated through the second ratchet gear, the sun gear, the planetary gear and the internal teeth.

[0007]

First Embodiment A first embodiment according to the present invention will be described with reference to FIGS.
In the drawing, reference numeral A is a ratchet spanner, in which the rotary shaft 2 is rotatably fitted to the end of the rotary handle 1, and the rotary shaft 2 is provided with a socket portion 3 for fitting a tightened body N such as a nut on the lower end surface. , A first ratchet gear 4 having an upper end protruding from the upper surface of the rotating handle 1 and having the rotating shaft 2 as an axis center, and a sun gear 5 provided around the middle thereof, and the rotating shaft 2 A second ratchet gear 6 facing the first ratchet gear 4 and a bottom portion 8 of a grip cylinder 7 are rotatably fitted by sandwiching the turning handle 1.

The second ratchet gear 6 has a plurality of shafts 9 and 9 concentrically planted therein to mount planetary gears 10 and 10 that mesh with the sun gear 5, and the grip cylinder 7 is the sun gear 5.
And surrounding the planetary gears 10, 10 and an inner peripheral wall 11
Is provided with internal teeth 12 that mesh with the planetary gears 10, 10, and the rotating handle 1 includes a first ratchet gear 4 and a second ratchet gear 4.
Ratchet pawls 13 and 14 that mesh with and disengage from each of the ratchet gears 6 to change the rotation direction of the ratchet gears 4 and 6.
And pressing mechanisms 15 and 15 for pressing the ratchet pawls 13 and 14 on the back side thereof.

The ratchet pawls 13 and 14 are arranged opposite to each other with the turning handle 1 sandwiched therebetween, and the center of the ratchet pawls 13 and 14 is pivotally supported by a shaft rod 16. The pressing mechanisms 15 and 15 are provided with ratchet pawls 13 and 14, respectively.
The pressing rods 17, 17 that come into contact with the back side of the
The ratchet pawls 13 and 14 are provided with springs 18 and 18 urged in such a direction that either one of the swinging ends of the ratchet pawls 13 and 14 engages with the ratchet gears 4 and 6. The socket portion 3 may be of a so-called box type shown in the drawings, and may be of a square projection type that fits into a socket wrench.

The first embodiment has the above-mentioned structure, and the swinging one ends of the ratchet pawls 13 and 14 are engaged with the ratchet gears 4 and 6 to change the direction of tightening rotation, for example (FIG. 1). ), The second ratchet gear 6 is pressed against the ratchet pawl 14 when the turning handle 1 is turned in the tightening rotation direction while the socket portion 3 is fitted to the tightened body N such as a nut and the grip cylinder body 7 is pressed by hand. While rotating, the planetary gears 10, 10 and the sun gear 5, which rotate with the rotation handle 1 at the same rotation angle as the rotation handle 1 and mesh with the rotation of the second ratchet gear 6, and the fixed state by gripping. The so-called planetary gear mechanism constituted by the inner teeth 12 of the rotary shaft 2 or the socket portion 3 accelerates and rotates in the tightening rotation direction. At this time, the first ratchet gear 4 fixed to the rotary shaft 2 rotates while pushing the ratchet pawl 13 in the engaged state away.

When the turning handle 1 is turned in the reverse direction, the ratchet pawls 13 and 14 engage with the ratchet gears 4 and 6, respectively.
The object to be tightened is to reversely rotate together with the rotating handle 1 while getting over the tooth portion of the above, and this is repeated to tighten the object N to be tightened.

When the rotating handle 1 is rotated in the same direction as described above without pressing the gripping cylinder 7, the planetary gear mechanism does not transmit rotation by each gear, so that each ratchet gear 4, 6 or socket portion 3 is ratcheted. While being pressed by the claws 13 and 14, it rotates by the same rotation angle as that of the rotating handle 1 and has the same function as a so-called normal ratchet spanner. When the tightened body N is loosened, the reverse operation is performed.

According to this embodiment, even when the tightening resistance of the object N to be tightened in the initial stage is small, the sun gear 5, the planetary gear 10 and the internal teeth 12 of the rotary shaft 2 mesh with each other. The engagement resistance of the ratchet pawls 13 and 14 engaged with the ratchet gears 4 and 6 is larger than the engagement resistance of the ratchet pawls 4 and 6, so that the ratchet pawls 13 and 14 are rotated in reverse. Ratchet gears 4, 6
Since the socket portion 3 does not rotate in the reverse direction while overcoming the tooth portion of the, the tightening work can be performed without the loosened body N.

When the rotating handle 1 is further rotated while the gripping cylinder 7 is being pressed, the planetary gear mechanism causes the rotating shaft 2, that is, the object N to be tightened to rotate at a speed higher than the rotation angle of the rotating handle 1, so that the tightening work is performed. Not only quickly but also by rotating the rotating handle 1 by separating the grip cylinder 7, the rotating handle 1 and the rotating shaft 2, that is, the tightened body N.
Has the same rotation angle and is the same as the conventional tightening work with a ratchet spanner, and it is highly workable because the speed can be increased and normal tightening can be selected according to the work.

[0015]

Second Embodiment A second embodiment according to the present invention will be described with reference to FIGS.
In the ratchet spanner A'of the embodiment, socket parts 3 ', 3'to be fitted to a tightened body N such as a nut are provided on both upper and lower end surfaces of a rotary shaft 2', and a first ratchet gear 4'is integrally provided. A second ratchet gear 6 ', which is rotatably fitted, is superposed on the lower side of the first ratchet gear 4', and these two ratchet gears 4'and 6'and the respective ratchet gears 4'and 6'are arranged. A ratchet pawl 18 that engages and disengages with each other to change the rotation direction, and a pressing mechanism 15 'that presses the back side of the ratchet pawl 18 are housed in the recess 19 of the rotary handle 1'.

The ratchet pawl 18 is a rotating handle 1 '.
A swinging main pawl 14 'pivotally supported by a shaft rod 16' and the swinging main pawl 1
4'a pair of child claws 13 ', 1 whose base ends are pivotally supported by a shaft 20.
3 ', the swinging main pawl 14' is provided with engaging tooth portions 21, 21 for engaging the second ratchet gear 6'at both end positions, and each child pawl 13 ', 13' is provided with the first ratchet gear 4 '. ′ Engages with the tips of the swinging main pawls 14 ′.
Springs 23, 23 which are urged in a direction coinciding with the engaging teeth 21, 21 are provided, and the pressing mechanism 15 'has a ball body 17' which abuts on the back side of the swing main pawl 14 '. One of the engaging tooth portions 21 and 21 and the child claws 13 'and 13' is provided with a spring 18 'biased in a direction to engage with each of the ratchet gears 4'and 6'. The configuration is the same as that of the first embodiment, and the reference numerals are the same.

The second embodiment has the above-mentioned structure, and the swinging main pawl 14 'of the ratchet pawl 18 is operated to be pivoted to engage the engaging tooth portions 21 and 2.
By engaging either one of the first and second ratchet gears 6 ', either one of the child claws 13', 13 'inevitably engages the first ratchet gear 4'and both ratchet gears 4', The operation of changing the rotation direction of 6'is the same as in the first embodiment except for the other operations and effects.

[0018]

[Effect] For example, in the initial stage of tightening, even if the tightening by the object to be tightened is loose, the engagement resistance due to the sun gear etc. is superior to the engagement resistance due to the ratchet gear and ratchet pawl, so the turning handle is turned in the reverse direction. Even if the object to be tightened does not rotate in the loosening direction together with the rotating shaft, not only the tightening work can be performed reliably, but also the planetary gear mechanism composed of the sun gear etc. by pressing the gripping cylinder and turning the rotating handle. Since the rotating shaft rotates at higher speed, tightening work can be done quickly, and when the gripping cylinder is released and the rotating handle is rotated, the planetary gear mechanism does not transmit the rotation and the rotating shaft has the same rotation angle as the rotating handle. Also suitable for normal tightening work.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment according to the present invention.

FIG. 2 is a central cross-sectional view of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

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

FIG. 5 is a plan view of the second embodiment.

6 is a central cross-sectional view of FIG.

7 is a cross-sectional view taken along the line DD of FIG.

FIG. 8 is a plan view of a ratchet pawl.

[Explanation of symbols]

 A ratchet spanner 1 rotating handle 2 rotating shaft 3 socket part 4 first ratchet gear 5 sun gear 6 second ratchet gear 7 gripping cylinder 10 planetary gear 12 internal teeth 13 ratchet pawl 14 ratchet pawl

Front page continued (72) Inventor Mitsuhiro Yanashita Iwabuchi Co., Ltd. 1-2-20 Toranomon, Minato-ku, Tokyo (56) Reference JP-A-54-147598 (JP, A) , U)

Claims (1)

[Scope of utility model registration request] 1. A rotary shaft is rotatably fitted to a rotary handle, a socket part is provided on an end face of the rotary shaft, a sun gear is provided on an outer peripheral surface of the rotary shaft, and the rotary shaft is fixed as an axial center. A first ratchet gear, a second ratchet gear rotatably fitted and a grip cylinder are arranged, the second ratchet gear axially mounts a plurality of planet gears that mesh with the sun gear, and the grip cylinder is A ratchet spanner provided with internal teeth for meshing with a planetary gear, and a rotary handle for engaging and disengaging with each of the first and second ratchet gears and providing ratchet pawls for changing the rotational direction of the two ratchet gears.