JP2022055532A - Ratchet tool and ratchet gear - Google Patents

Abstract

To provide a ratchet tool reduced in weight while guaranteeing a mechanical strength.SOLUTION: A ratchet tool 100 for fastening an object to be fastened in a state where the rotational direction of a ratchet gear 10 is restricted in one direction by a claw 20 is configured such that the ratchet gear 10 has punched parts 15 intermittently or continuously provided along a peripheral direction. The ratchet gear 10 has a tooth surface X1 provided to a peripheral surface, and a first plane directed toward the object to be fastened and a second plane directed to the opposite side, which hold the tooth surface X1 between the planes from an axial direction. The punched parts 15 are through-holes or recesses provided to at least one of the first and second planes.SELECTED DRAWING: Figure 1

Description

The present invention relates to a ratchet tool.

As a tightening tool for tightening bolts and nuts, there is a ratchet tool shown in Patent Document 1.

Specifically, the ratchet tool includes a ratchet gear and a claw portion that regulates the rotation direction of the ratchet gear in one direction, and is configured to rotate idle when rotated in the direction opposite to the tightening direction. With such a configuration, bolts, nuts, and the like can be quickly tightened.

However, ratchet tools are heavier than tools such as spanners and wrench wrench by the amount of ratchet gears and claws, so for example, the wrists of workers may be strained or they may not be easily carried to a work place on a steel tower. , The head becomes heavy and it becomes difficult to balance. As an aspect of reducing the weight, for example, it is conceivable to reduce the thickness of the ratchet gear, but in this case, the tooth surface of the ratchet gear is also thinned, so that the mechanical strength may not be guaranteed.

JP-A-2018-89708

Therefore, the present invention has been made to solve the above problems, and its main object is to provide a ratchet tool capable of reducing the weight while ensuring the mechanical strength.

That is, the ratchet tool according to the present invention is a ratchet tool for tightening a tightening target in a state where the rotation direction of the ratchet gear is restricted in one direction by the claw portion, and the ratchet gear is intermittent along the circumferential direction. It is characterized by having a lightening portion provided in a target or continuously.

According to the ratchet tool configured in this way, the lightening portion is provided intermittently or continuously along the circumferential direction of the ratchet gear, so that the weight can be reduced without thinning the tooth surface of the ratchet gear. I can plan. This makes it possible to reduce the weight of the ratchet tool while ensuring the mechanical strength of the ratchet gear. Further, the wear resistance can be improved by holding the grease in the lightening portion.

The ratchet gear has a tooth surface provided on an outer peripheral surface, a first plane that sandwiches the tooth surface from the axial direction and faces the tightening target side, and a second plane that faces the opposite side. It is preferable that the lightening portion is a through hole or a recess provided in at least one of the first plane and the second plane.
With such a configuration, since the through holes and recesses are provided in the first plane and the second plane which occupy a relatively large area in the entire outer surface of the ratchet gear, the ratchet gear can be made lighter.

As a specific embodiment for ensuring the mechanical strength, an embodiment in which the lightening portion is recessed without penetrating each of the first plane and the second plane in the axial direction can be mentioned. ..
In this case, since the remaining portion is interposed between the lightening portion provided on the first flat surface and the base portion on the meat provided on the second flat surface, the mechanical strength can be ensured by this remaining portion.

In order to more reliably secure the mechanical strength, it is preferable that the lightening portion provided on the first plane and the lightening portion provided on the second plane are displaced in the circumferential direction.

On the other hand, as a specific embodiment for simplifying the manufacturing process, the lightening portion is a through hole formed by axially penetrating the corresponding portions of the first plane and the second plane. Can be mentioned.

The ratchet gear has a mounting convex portion that stands up from the second plane and is mounted in a mounting groove provided in the head of the tool body, and the lightening portion is provided on the second plane and is described as described above. It is preferable that it overlaps the outer peripheral surface of the mounting convex portion.
With such a configuration, the lightening portion is provided not only on the second plane but also on the outer peripheral surface of the mounting convex portion, so that the weight can be further reduced.

The claw portion has a tooth surface formed in a predetermined region on the outer peripheral surface facing the ratchet gear, and a pair of virtual lines connecting each of both ends in the circumferential direction of the predetermined region and the rotation center of the ratchet gear. It is preferable that the lightening portion is configured to fit in between.
In such a configuration, where the stress from the claw portion acts between the pair of virtual lines described above on the tooth surface of the ratchet gear, the lightening portion is contained between the pair of virtual lines. The stress from the claw portion can be received by the non-lightened portions on both sides of the lightening portion, and the mechanical strength can be ensured.

Further, the ratchet gear according to the present invention constitutes a ratchet tool, is a ratchet gear whose rotation direction is restricted in one direction by a claw portion, and is provided intermittently or continuously along the circumferential direction. It is characterized by having a plurality of lightening portions.
According to the ratchet gear configured in this way, the same operation and effect as those of the ratchet tool described above can be obtained.

According to the present invention configured as described above, the weight of the ratchet tool can be reduced while ensuring the mechanical strength of the ratchet gear.

It is a top view which shows typically the ratchet tool which concerns on one Embodiment. It is a perspective view which shows typically the ratchet gear of this embodiment. It is a perspective view which shows typically the ratchet gear of this embodiment. It is sectional drawing which shows typically the ratchet gear of this embodiment. It is a top view which shows typically the ratchet gear of this embodiment. It is a top view which shows typically the ratchet gear of this embodiment. It is a top view which shows typically the ratchet gear of this embodiment. It is a perspective view which shows typically the ratchet gear of another embodiment. It is a top view schematically showing the ratchet gear of another embodiment.

Hereinafter, the tightening tool according to the present invention will be described with reference to the drawings.

The ratchet tool according to the present invention tightens a tightening target such as a bolt or a nut, and specific embodiments include a ratchet handle and a ratchet wrench used in combination with a socket.

Specifically, as shown in FIG. 1, the ratchet tool 100 includes at least a ratchet gear 10 and a claw portion 20 that regulates the rotation direction of the ratchet gear 10 in one direction, so that the ratchet tool 100 spins idle when rotated in the reverse direction. It is configured in. Here, the rotation direction of the ratchet gear 10 can be switched between the forward direction and the reverse direction, but the present invention is not limited to this.

Since this ratchet tool 100 is characterized by the ratchet gear 10, it will be described in detail below.

The outer peripheral surface of the ratchet gear 10 is the tooth surface X1 and engages with the tooth surface X2 provided on the outer peripheral surface of the claw portion 20. Specifically, a predetermined number of teeth (for example, 7) has a predetermined angle (for example, 7) in a predetermined region Z (for example, a range of 24 degrees about the rotation axis of the ratchet gear 10) on the outer peripheral surface facing the ratchet gear 10 in the claw portion 20. For example, it is formed at 4 degrees), and the function as a ratchet mechanism is exhibited in a state where the tooth surface X1 of the ratchet gear 10 is engaged with these tooth surfaces X2.

As shown in FIGS. 2 and 3, the ratchet gear 10 has a first plane 11 and a second plane 12 that sandwich the tooth surface X1 from the axial direction and face opposite sides to each other.

As shown in FIG. 2, the first plane 11 is a plane forming an annular shape facing the tightening target side, and is a plane parallel to the radial direction of the ratchet gear 10. Here, the first flat surface 11 is provided with a insertion angle 13 to which a socket corresponding to the type and size of the fastening target is attached. The insertion angle 13 is a square columnar one that projects in a direction orthogonal to the first plane 11, that is, in the axial direction. However, the ratchet gear 10 does not necessarily have to be provided with the insertion angle 13, and for example, a fitting groove for fitting with the fastening target may be provided on the first plane 11.

As shown in FIG. 3, the second plane 12 is an annular plane facing the opposite side of the first plane 11 and is a plane parallel to the radial direction of the ratchet gear 10. Here, the second flat surface 12 is provided with a mounting convex portion 14 to be mounted in a mounting groove provided in the head 31 of the tool body 30. The mounting convex portion 14 has a cylindrical shape that rises along the axial direction from the inner edge portion of the second plane 12. However, the ratchet gear 10 does not necessarily have to be provided with the mounting convex portion 14.

Therefore, as shown in FIGS. 2 and 3, the ratchet gear 10 of the present embodiment has a plurality of lightening portions 15 intermittently provided along the circumferential direction.

More specifically, the lightening portion 15 is a recess provided in at least one of the first plane 11 and the second plane 12, and here, the corresponding portions of the first plane 11 and the second plane 12 respectively. Is a dent that is dented without penetrating in the axial direction by cutting using, for example, an end mill or a drill. These lightening portions 15 may be formed so that the opening area seen from the axial direction is larger than the area of the bottom surface. The corresponding points are the same places in the circumferential direction, in other words, the places that overlap each other when viewed from the axial direction.

On the first plane 11, a plurality of (here, 18) lightening portions 15 having the same shape in a plan view are provided at equal intervals, for example, along the circumferential direction. Specific shapes include various shapes such as a circular shape, an elliptical shape, a quadrangular shape, a triangular shape, and a polygonal shape in a plan view, but here, a teardrop shape that swells from the inside to the outside in the radial direction. .. The plurality of lightening portions 15 do not necessarily have to be provided at equal intervals, and may be provided at uneven intervals, or may be provided regularly or irregularly. Further, these lightening portions 15 do not necessarily have to have the same shape as each other, and some or all of them may have different shapes.

On the second plane 12, a plurality of (here, 18) lightening portions 15 having the same shape in a plan view are provided at equal intervals, for example, along the circumferential direction. Specific shapes include various shapes such as a circular shape, an elliptical shape, a quadrangular shape, a triangular shape, and a polygonal shape in a plan view. Here, the lightening portion 15 provided on the first flat surface 11 is used. It has the same shape and has a teardrop shape that swells from the inside to the outside in the radial direction. The lightening portion 15 provided on the first flat surface 11 and the lightening portion 15 provided on the second flat surface 12 may have different shapes from each other. The plurality of lightening portions 15 do not necessarily have to be provided at equal intervals, and may be provided at uneven intervals, or may be provided regularly or irregularly. Further, these lightening portions 15 do not necessarily have to have the same shape as each other, and some or all of them may have different shapes.

In the present embodiment, as shown in FIG. 4, the lightening portion 15 provided on the first plane 11 is formed shallower than the lightening portion 15 provided on the second flat surface 12. That is, the depth dimension from the first plane 11 to the bottom surface of the lightening portion 15 provided on the first flat surface 11 is from the second plane 12 to the bottom surface of the lightening portion 15 provided on the second flat surface 12. Is smaller than the depth dimension of.

Further, in the present embodiment, the lightening portion 15 on the second plane 12 side is provided so as to overlap the outer peripheral surface 141 of the mounting convex portion 14 described above, as shown in FIGS. 3 and 4. That is, these lightening portions 15 are formed by cutting the outer peripheral portion of the mounting convex portion 14 together with the second flat surface 12 by, for example, an end mill or a drill, and the outer peripheral portion of the mounting convex portion 14 is cut from the second flat surface 12. It is continuously formed over the surface 141.

Here, in the present embodiment, as shown in FIGS. 5 and 6, since a plurality of lightening portions 15 are intermittently provided in the circumferential direction as described above, they are between the lightening portions 15 adjacent to each other. In, the portion remaining without being lightened is interposed as the remaining portion 16.

In such a configuration, as shown in FIG. 5, each lightening portion 15 is in a predetermined region Z provided with the tooth surface X2 of the claw portion 20 in a state where the ratchet gear 10 and the claw portion 20 are engaged with each other. The size is formed so as to fit between a pair of virtual lines L connecting each of both ends in the circumferential direction and the rotation center of the ratchet gear 10.
As a result, in the state of FIG. 5, at least a part of the remaining portion 16 located on one side in the circumferential direction of the lightening portion 15 between the pair of virtual lines L and the other side in the circumferential direction of the same lightening portion 15. At least a part of the remaining portion 16 located on the side can receive the stress acting on the ratchet gear 10 from the claw portion 20.
Further, in the state of FIG. 6, the entire remaining portion 16 interposed between the lightening portions 15 adjacent to each other is accommodated between the pair of virtual lines L, and the entire remaining portion 16 causes the claw portion. It is possible to receive stress acting on the ratchet gear 10 from 20.

Further, the lightening portion 15 of the present embodiment has a teardrop shape that swells from the inside to the outside in the radial direction as described above. As a result, the inner peripheral surface of the lightening portion 15 includes a pair of expansion elements 151 that gradually expand from the outside in the radial direction to the inside.
In such a configuration, as shown in FIG. 7, one of the pair of expansion elements 151 extends from the claw portion 20 along the action direction F of the stress acting on the ratchet gear 10 in the process of rotating the ratchet gear 10. This functions as a surface for improving the durability against the stress.

According to the ratchet tool 100 configured in this way, since the plurality of lightening portions 15 are intermittently provided along the circumferential direction of the ratchet gear 10, the tooth surface X1 of the ratchet gear 10 is not thinned. , Weight reduction can be achieved. This makes it possible to reduce the weight of the ratchet tool 100 while ensuring the mechanical strength of the ratchet gear 10. Further, the wear resistance can be improved by holding the grease in the lightening portion 15.

Further, since the lightening portion 15 is provided on the first plane 11 and the second flat surface 12 which occupy a relatively large area on the entire outer surface of the ratchet gear 10, the lightening portion 15 is provided on the other surface as compared with the case where the lightening portion 15 is provided. The number of lightening portions 15 can be increased or the size can be increased, and the ratchet gear 10 can be made lighter.

Further, since the lightening portion 15 is a recess that is recessed without penetrating each of the first plane 11 and the second plane 12 in the axial direction, the lightening portion 15 and the second plane provided on the first plane 11 are recessed. A residual portion along the axial direction is interposed between the lightening portion 15 provided in the 12 and the remaining portion can ensure the mechanical strength.

In addition, since the lightening portion 15 is provided on the second flat surface 12 and overlaps with the outer peripheral surface 141 of the mounting convex portion 14, the ratchet gear 10 can be made as light as possible.

The present invention is not limited to the above embodiment.

For example, in the above-described embodiment, a plurality of lightening portions 15 are intermittently provided along the circumferential direction, but as shown in FIG. 8, the lightening portions 15 are continuously provided along the circumferential direction. You may be.

Further, the number of the lightening portions 15 is not limited to the embodiment, and may be appropriately changed from one, two, or more. As an example, FIG. 9 shows a ratchet gear 10 provided with 15 lightening portions 15.

Further, although the lightening portion 15 of the embodiment is provided at a position corresponding to each other of the first plane 11 and the second plane 12, the lightening portion 15 provided on the first plane 11 and the second lightening portion 15 are provided. The lightening portion 15 provided on the flat surface 12 may be displaced in the circumferential direction.

Moreover, the lightening portion 15 may be a through hole formed by penetrating the corresponding portions of the first plane 11 and the second plane 12 in the axial direction. The through hole in this case is provided along the axial direction of the ratchet gear 10. However, the through hole extending inclining in the axial direction may be used as the lightening portion 15.

In addition, in the above-described embodiment, a ratchet tool such as a ratchet handle or a ratchet wrench has been taken as an example, but the ratchet tool according to the present invention may be a torque wrench, a ratchet wrench, a ratchet driver, or the like.

In addition, the present invention is not limited to each of the above-described embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

100 ・ ・ ・ Ratchet tool 10 ・ ・ ・ Ratchet gear X1 ・ ・ ・ Tooth surface 11 ・ ・ ・ First plane 12 ・ ・ ・ Second plane 13 ・ ・ ・ Drive angle 14 ・ ・ ・ Mounting convex part 141 ・ ・ ・Outer peripheral surface 15 ・ ・ ・ Lightening part 151 ・ ・ ・ Expansion element 16 ・ ・ ・ Remaining part 20 ・ ・ ・ Claw part X2 ・ ・ ・ Tooth surface 2Z ・ ・ ・ Predetermined area 30 ・ ・ ・ Tool body 31 ・ ・ ・Head L ・ ・ ・ Virtual line

Claims (8)

It is a ratchet tool for tightening the tightening target with the rotation direction of the ratchet gear restricted in one direction by the claws.
A ratchet tool characterized in that the ratchet gear has a lightening portion intermittently or continuously provided along the circumferential direction. The ratchet gear has a tooth surface provided on an outer peripheral surface, a first plane that sandwiches the tooth surface from the axial direction and faces the tightening target side, and a second plane that faces the opposite side.
The ratchet tool according to claim 1, wherein the lightening portion is a through hole or a recess provided in at least one of the first plane and the second plane. The ratchet tool according to claim 2, wherein the lightening portion is a recess that is recessed without penetrating each of the first plane and the second plane in the axial direction. The lightening portion is provided on each of the first plane and the second plane.
The ratchet tool according to claim 3, wherein the lightening portion provided on the first flat surface and the lightening portion provided on the second flat surface are displaced in the circumferential direction. The ratchet tool according to claim 2, wherein the lightening portion is a through hole formed through the corresponding portions of the first plane and the second plane in the axial direction. The ratchet gear has a mounting protrusion that stands up from the second plane and is mounted in a mounting groove provided in the head of the tool body.
The ratchet tool according to any one of claims 2 to 5, wherein the lightening portion is provided on the second flat surface and overlaps with the outer peripheral surface of the mounting convex portion. The claw portion has a tooth surface formed in a predetermined region of the outer peripheral surface facing the ratchet gear.
One of claims 1 to 6, wherein the lightening portion is accommodated between a pair of virtual lines connecting each of both ends in the circumferential direction of the predetermined region and the rotation center of the ratchet gear. Ratchet tool described in. It is a ratchet gear that constitutes a ratchet tool and whose rotation direction is regulated in one direction by the claws.
A ratchet gear characterized by having a lightening portion provided intermittently or continuously along the circumferential direction.

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