JPH03121342A - Ratchet wheel device - Google Patents

Abstract

PURPOSE:To make it possible to simultaneously release the meshing between feed and reverse-check pawls and a ratchet wheel by one step, by arranging a rotary member for releasing the feed pawl and the reverse check pawl from the ratchet wheel, coaxially with and juxtaposedly to the ratchet wheel. CONSTITUTION:At first, a rotary handle 13 is made into contact with a first stopper 14 so as to retract releasing protrusions 11, 12 to positions where they do not interfere with a feed pawl 6 and reverse check pawl 8. Further, the feed pawl 6 is reciprocated by a swing lever 5, and accordingly, a ratchet wheel 2 is intermittently rotated in the direction of the arrow A. If the ratchet wheel 2 is reversed so as to be returned to its original position, the rotary handle 13 is rotated in the direction of the arrow B, and is made into contact with a second stopper 5. Then, the releasing protrusions 11, 12 are moved along a circular orbit 10 so as to press the feed claw 6 and the reverse check claw 8, and accordingly, these are rotated clockwise around attaching shafts 16, 17 so as to release the meshing between them and the ratchet wheel 2. At this time, the protrusion 12 is held by the urging force of a retaining spring 7, and the rotary member 9 is fixed at its release position.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a ratchet wheel device, and particularly to a ratchet wheel device equipped with a mechanism that can simultaneously release the meshing of the feed pawl and the reversal prevention pawl that mesh with the ratchet wheel. It is something.

[Prior Art] A ratchet wheel device is widely known as one of the intermittent motion mechanisms.

As shown in FIG. 3, in this ratchet device, a feed pawl 3a and a reversal prevention pawl 4a are engaged with pawl teeth 2a formed on the outer periphery of a ratchet wheel 1a, and the feed pawl 3a is connected to a swinging lever. 5a to rotate the ratchet wheel 1a intermittently in one direction, and is used, for example, as a feeding device for hand tools, machine tools, etc.

[Problems to be Solved by the Invention] However, in the conventional ratchet wheel device, the ratchet wheel 1a
If you want to reverse the movement and return it to its original position, you must release the engagement with the pawl wheel 1a as shown by the chain line in Figure 3 by rotating the feed pawl 3a and the anti-reverse pawl 4a. At this time, the feed pawl 3a can be easily released by moving the swing lever 5a to the position shown by the chain line in FIG. There was a problem in that the release operation had to be performed in a completely different manner from the operation using the feed pawl 3a, and the release operation was troublesome. Regarding the feed pawl 3a, when the swing lever 5a is in a state where its own weight is applied in the meshing direction, the swing lever 5a must be held in order to release the feed pawl 3a, resulting in poor workability. There are also problems.

The present invention has been made for the purpose of solving such problems, and it is an object of the present invention to provide a ratchet wheel device that can simultaneously release the meshing of the feed pawl, the anti-reverse pawl, and the ratchet wheel with one operation. This is an issue to be addressed.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a mechanism in which a feed pawl and a reversal prevention pawl, which are reciprocated by a swing lever, mesh with pawl teeth formed on the outer periphery of a ratchet wheel. In the ratchet wheel device, a rotating member having a protruding release protrusion for disengaging the feed pawl and the anti-reverse pawl from the pawl teeth is arranged coaxially with the ratchet wheel.

[Operation] The release protrusion of the rotating member is placed in a position where it does not interfere with the feed pawl and the anti-reverse pawl, and the feed pawl is reciprocated by the swing lever, causing the ratchet wheel to rotate intermittently in one direction.

Also, by rotating the rotating member, the release protrusion presses and rotates the feed pawl and the reverse prevention pawl to separate them from the pawl teeth.
The respective meshes with the ratchet wheels are released, thereby allowing the ratchet wheels to be reversed.

[Example] Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which a ratchet wheel 2 is provided with pawl teeth 1 on its outer periphery, and its tip is pivoted on a central shaft 3, similar to the conventionally known ratchet device. A feed pawl 6 reciprocated by a swing lever 5 pivotally supported at the base end of the fixed link 4 engaged with a reversal prevention pawl 8 urged toward the ratchet wheel 2 by a pressing spring 7 made of a leaf spring. are doing.

A rotating member 9 is attached to the central shaft 3 adjacent to the ratchet wheel 2. This rotating member 9 has a diameter slightly larger than the outer diameter of the ratchet wheel 2, and on the outer side of the outer diameter of the ratchet wheel 2, the feed pawl 6 and Release protrusions 11 and 12 are provided to press and rotate the anti-reverse pawl 8, respectively. These protrusions 11 and 12 are such that when one protrusion 11 or 12 is aligned with the meshing position of the feed pawl 6 or the anti-reverse pawl 8 with the ratchet wheel 2, the other protrusion 12 or 11 engages with the anti-reverse pawl 8 or the feed pawl. These protrusions are provided at positions that match the meshing positions of the six ratchet wheels 2, respectively, and therefore, they are pressed and rotated at the same time to separate from the pawl teeth l.

In the drawing, reference numeral 13 denotes a rotary handle protruding from the rotary member 9, 14.15 a stopper for regulating the rotation range of the rotary handle 14, and 16.17 a feed pawl 6 and a reversal prevention pawl 8, respectively. This is the focus of the coverage.

To use the embodiment with such a configuration, first, operate the rotary handle 13 so that it comes into contact with one of the stoppers 14 as shown in FIG. Move to a position where it will not interfere with 8.

Then, like the conventional ratchet wheel device, the swing lever 5 causes the feed pawl 6 to reciprocate, and the ratchet wheel 2 is intermittently rotated in the direction of arrow C in FIG.

If you want to reverse the ratchet wheel 2 and return it to its original position, operate the rotary handle 13 again and rotate the rotary member 9.
Rotate in the direction of arrow C in Fig. 2, and press the other stopper 1.
5. Then, as shown in FIG. 2, the release protrusion 11.12 moves on the circular orbit 10, presses the feed pawl 6 and the anti-reverse pawl 8, and removes them clockwise around the mounting shaft 16.17. direction to release the engagement with ratchet wheel 2. Also, at this time, the protrusion 12 of the rotating member 9 sandwiched between the ratchet wheel 1 and the anti-reverse pawl 6 presses the spring 7.
The rotating member 9 is held by the pressing force of , and the rotating member 9 is fixed at the released position.

Therefore, the ratchet wheel 2 becomes free and can be returned to its original position very easily.

When restarting the work, operate the rotary handle 13 in the direction of arrow C in FIG. and rotate the pawl wheel 2.

According to this embodiment, the rotation handle 1 controls the engagement and release of the ratchet wheel 2 with the feed pawl 6 and the reverse prevention pawl 8.
3, the ratchet wheel 2 can be driven and returned to its original position repeatedly with a single operation, resulting in extremely efficient work. In particular, in this embodiment, the rotary handle 1 is used to easily and reliably rotate the rotary member 9.
3 and its stoppers 14 and 15, the operation is easier and more reliable.

In this embodiment, the rotary member 9 is shaped like a disk with a larger diameter than the ratchet wheel 2, but it can also be shaped like an arm as shown by the chain line 18 in FIG. It is possible to take an appropriate shape, such as a configuration in which the Furthermore, although this embodiment has been described as having one feed pawl 6 and one reversal prevention pawl 8, even if there are a plurality of these pawls, this can be handled by adding release protrusions 11 and 12. be able to. Furthermore, the present invention can be similarly implemented in other ratchet wheel devices having ratchet wheels of different configurations, such as an inner ratchet wheel or a crown ratchet wheel.

[Effects of the Invention] According to the present invention having the above configuration, the feed pawl, the reversal prevention pawl, and the ratchet wheel can be simultaneously engaged by simply operating the rotating member without operating the swing handle or the reversal prevention pawl. It can be released easily, and it can be released easily compared to the conventional system in which the feed pawl and anti-reverse pawl must be operated separately and the swing handle and anti-reverse pawl must be held in the released state. In addition, when the rotating member is in the released state, it is pressed and held by the push spring provided in the anti-reverse pawl, so there is no need to hold the anti-reverse pawl or the swing handle, making the work extremely easy. .

Furthermore, it is sufficient to simply mount a rotary member with a protruding release protrusion on a conventional pawl-type device in line with the ratchet wheel and coaxially, which not only requires no complicated mechanism and can be provided at low cost, but also improves the existing pawl-type device. It is also extremely easy to implement.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the present invention; Figure 1 is a front view showing a meshed state, Figure 2 is a front view showing a disengaged state, and Figure 3 is a front view showing a disengaged state. is a front view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Pawl tooth, 2... Pawl wheel, 5... Rocking lever 6... Feed pawl, 8... Reversal prevention pawl, 9...
- Rotating member, 11.12...Release protrusion. agent

Claims (1)

[Claims] In a ratchet device in which a feed pawl and a reversal prevention pawl that are reciprocated by a swing lever are engaged with pawl teeth formed on the outer periphery of the ratchet wheel, the feed pawl and the reversal prevention pawl are moved from the pawl teeth. A ratchet wheel device characterized in that a rotary member having a protruding release protrusion for detachment is disposed parallel to and coaxially with the ratchet wheel.