JP2003089070A - Ratchet wrench - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a turn prevention function of a ratchet anvil in the opposite direction by forming a housing body by a sturdy structure deforming not easily to enable smooth turn in one direction of forward and reverse directions of a jig and manufacture the sturdy housing body inexpensively without requiring much time and labor and advanced technical skill. SOLUTION: A ratchet yoke 21 and the ratchet anvil 22 are assembled and stored in the housing body 20 formed like a box having an opening part 28 and a U-shaped cross section. Moreover, a jig fixing part 37 protrudes to the outside from a lid body 30 covering the opening part 28 to press and energize the ratchet anvil 22 in the direction of the inside of the housing body 20 by an elastic body 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ratchet wrench capable of rotating a jig for tightening bolts, nuts, screws and the like when assembling and servicing automobiles and various other devices. It is related to.

[0002]

2. Description of the Related Art Conventionally, a ratchet wrench for rotating a jig for tightening bolts, nuts, screws and the like has been used when assembling and servicing automobiles and various other devices. This ratchet wrench, as shown in Figure 3,
A pair of support walls (4) are connected and arranged in parallel to the housing body (1) via the arrangement interval (3) of the ratchet yoke (2). A ratchet yoke (2) is inserted and arranged in the arrangement interval (3) of the support wall (4) so as to be reciprocally rotatable by the rotation of the crankshaft (5). This ratchet yoke
(2) The ratchet anvil (8) is inserted and arranged on the inner surface.

An elastic body such as a washer is provided between the inner surface of the pair of support walls (4) and the outer surface of the ratchet anvil (8).
By disposing (10), the ratchet anvil (8) is elastically sandwiched between both support walls (4). The holding force of the support wall (4) enables the ratchet anvil (8) to rotate in one direction, the forward direction or the reverse direction, but it does not rotate in the direction opposite to the intended direction. Can be prevented. Therefore, the jig can be rotated by converting the reciprocating rotation of the ratchet yoke (2) into the rotation of the ratchet anvil (8) in only one direction, the forward direction or the reverse direction. .

[0004]

However, when the ratchet anvil (8) rotates in the forward and reverse directions against the holding force of the support wall (4), the ratchet anvil (8) is attached to the support wall (4). In addition to a large load due to friction being applied to the contacting part with), an outward reaction force from the elastic body 10 is also applied. Therefore, due to long-term use of the ratchet wrench, the pair of support walls (4) are gradually curved outward and the arrangement interval (3) is widened, and the holding force of the support wall (4) on the ratchet anvil (8) is increased. There was a thing to fall. Due to this decrease in clamping force,
The effect of preventing the ratchet anvil (8) from rotating in the opposite direction was impaired, making smooth rotation of the jig difficult.

Further, in order to prevent the support wall (4) from expanding, a method of increasing the strength by taking time for forging such as annealing is used at the time of manufacturing the housing body (1). The manufacturing of the main body (1) requires a lot of labor and advanced technology, and is expensive. Further, even if it is formed to be strong as described above, the conventional structure of the supporting wall (4) in which only one end is fixed and faces in parallel has a limit in preventing the deformation.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, in which the housing body of the ratchet wrench is formed with a robust structure that does not easily deform, and the ratchet anvil rotates in the forward or reverse direction. By constantly applying a constant pressing force to the ratchet anvil, the ratchet anvil can be prevented from rotating in the opposite direction for a long period of time. Further, the housing body having excellent durability is manufactured by an easy manufacturing method to obtain an inexpensive product.

[0007]

In order to solve the above-mentioned problems, the present invention uses a ratchet yoke to reciprocally rotate,
In the ratchet wrench that allows the jig to be rotated in one direction, the ratchet anvil inserted and arranged in this ratchet yoke can be rotated in one direction. Formed in the shape of a box, the ratchet yoke and ratchet anvil are built in and housed in this housing body, the opening is covered with a lid, and the jig fixing part of the ratchet anvil is projected to the outside from this lid. The elastic body enables the ratchet anvil to be pressed and urged toward the inside of the housing body.

Further, the elastic body may be housed in the housing body so that the ratchet anvil can be pressed and biased.

Further, the elastic body may be one in which the lid body holds an elastic force and the ratchet anvil is pressed and biased by the lid body which is the elastic body.

[0010]

The present invention is constructed as described above, and the basic structure and operating mechanism of the rotating mechanism of the jig such as the ratchet yoke, ratchet anvil, etc. are conventionally known. Further, in the present invention, since the ratchet anvil is pressed and biased toward the inside of the housing main body by the pressing spring, an appropriate frictional resistance force is generated between the ratchet anvil and the housing main body. Due to this frictional resistance, the ratchet anvil does not rotate easily even if it receives a small turning force, but if it receives a large turning force,
The ratchet anvil becomes rotatable against the frictional resistance with the housing body.

In order to rotate the jig with the ratchet wrench, first, the jig is connected to the jig fixing portion of the ratchet anvil. Next, the ratchet pole pivotally supported on the ratchet anvil is engaged in the internal gear of the ratchet yoke in the forward or reverse direction so that the ratchet anvil can be rotated only in the forward or reverse direction.

Then, a driving mechanism such as an electric motor is driven to reciprocally rotate the ratchet yoke. In this reciprocating rotation of the ratchet yoke, if the ratchet yoke swings in one direction for the purpose of rotation, the ratchet anvil will receive a strong turning force in one direction due to the engagement between the ratchet pole and the ratchet yoke. In addition, the ratchet anvil rotates in one direction together with the ratchet yoke against the frictional resistance generated between the ratchet anvil and the housing body.

On the other hand, even when the ratchet yoke swings in the direction opposite to the previous direction, the ratchet anvil inserted and arranged in the ratchet yoke still receives a rotational force in the opposite direction. However, in this opposite direction, the ratchet yoke and the ratchet pole do not engage with each other, the ratchet anvil is relatively rotatable, and the frictional force with the housing main body exceeds the rotational force received by the ratchet anvil. It is possible to prevent rotation in the opposite direction.

As described above, due to the action of the frictional resistance force generated between the ratchet anvil and the housing body, the ratchet anvil is prevented from rotating in the opposite direction, and the ratchet anvil can be moved in only one direction, the forward direction or the reverse direction. Can be turned to. Therefore, it is possible to rotate the jig connected to the ratchet anvil in the forward and reverse directions to smoothly tighten the bolts, nuts, screws and the like.

In the prior art, the ratchet anvil is prevented from rotating in the opposite direction by elastically sandwiching the ratchet anvil with a pair of support walls connecting only one end to each other. The large frictional resistance and reaction force from the elastic body gradually deform the support wall,
The anti-rotation effect of the ratchet anvil in the opposite direction was impaired.

However, since the housing body of the present invention is formed in a box shape having a U-shaped cross section, it is structurally robust and does not easily deform. The elastic body arranged inside this robust housing body presses and urges the ratchet anvil, so even if a reaction force from the elastic body or a large frictional resistance at the time of ratchet anvil rotation is received,
The housing body and lid are not easily deformed, and the function of preventing the ratchet anvil from rotating in the opposite direction can be maintained for a long time. The elastic body may be one in which a member such as a corrugated washer is housed in the housing body to press and urge the ratchet anvil. Alternatively, the lid body may be made to retain an elastic force, and the ratchet anvil may be pressed and biased by the lid body that is an elastic body.

Further, conventionally, in order to increase the strength of the pair of support walls, it took time to anneal or the like and required labor and advanced technology for manufacturing. However, the housing body of the present invention is
Formed in a box shape with a U-shaped cross section, it is structurally robust,
It is not necessary to forge by applying high technology and labor, and it is possible to obtain inexpensive products by eliminating the labor of manufacturing.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (20) is a housing body, which is a ratchet yoke (21) for rotating a jig and a ratchet anvil (22).
It houses a rotating member such as. The motor housing (24) is connected to the housing body (20) via the connection ring (23). This motor housing
The reference numeral (24) accommodates a conventionally known drive mechanism (not shown) such as an electric motor or an air motor for rotating the rotating member. This drive mechanism is controlled by a throttle lever (25) arranged on the outer surface of the motor housing (24).

The housing body (20) is shown in FIG.
As shown in FIG. 2, a flat plate-shaped bottom portion (26), an outer peripheral wall (27) continuously provided on the bottom portion (26) in a vertical direction, and an outer peripheral wall (2
7) is formed in a box shape having a U-shaped cross section having an opening (28) opened at one end. And this housing body
The opening (28) of (20) is covered with a lid (30), and this lid (30) is inserted into the insertion hole (31) with three screws (3).
It is fixed to the housing body (20) by 2).

Further, inside the housing body (20),
The ratchet yoke (21) is housed so as to be capable of reciprocating rotation, and the bush (3) of the crankshaft (34) is housed in the arc-shaped recess (33) provided at one end of the ratchet yoke (21).
5) is connected. This crankshaft (34)
It can be rotated in one direction by a drive mechanism housed in the motor housing (24). This crankshaft (3
4) The bush (35) arranged at the eccentric position of the tip circularly moves within the arcuate recess (33) of the ratchet yoke (21), whereby the ratchet yoke (21) is repeatedly rotated in the forward and reverse directions. is there.

Further, the ratchet yoke (21) has a ratchet anvil inside the internal gear (36) formed on the inner circumference thereof.
(22) is inserted rotatably in the forward and reverse directions. A jig fixing part (37) for connecting a jig is provided at one end of the ratchet anvil (22), and the jig fixing part (37) is provided with a projecting opening (38) provided in the lid body (30). Protruding outward from.

The housing body (20) has a bottom (2
6) and the ratchet anvil (22), and the lid (3
0) and the ratchet anvil (22), elastic bodies (39) (40) such as wavy washers are respectively interposed, and the ratchet anvil (22) is pressed from both sides toward the inside of the housing body (20). I am energetic. Due to this pressing force, the ratchet anvil (22) and the housing body (20) do not easily rotate in the forward and reverse directions even if some rotational force is applied to the ratchet anvil (22). Such an appropriate frictional resistance force is generated. In addition, in this embodiment, between the lid body (30) and the ratchet anvil (22),
Although the elastic body (40) formed separately from the lid body (30) is used, the lid body (30) itself retains an elastic force,
The ratchet anvil (22) may be pressed and urged by (30).

The ratchet anvil (22) has a ratchet pole (42) in an insertion recess (41) provided on one side.
Is fixed by a fixed shaft (43) so as to be swingable in forward and reverse directions. On the other hand, a pressing pin (46) is arranged on the side surface of the forward / reverse switching shaft (44) rotatably inserted in the axis of the ratchet anvil (22), and the pressing pin (46) presses the pressing spring (4).
By means of 5), the ratchet pole (42) is projected by an appropriate biasing force. Then, the pressing pin (46) presses the ratchet pole (42) at a position eccentric from the fixed shaft (43), and the ratchet pole (42) is pushed against the internal gear (36) of the ratchet yoke (21). It can be engaged in the forward direction or the reverse direction.

In the ratchet wrench constructed as described above, in order to rotate the jig in the forward direction, the knob (4) of the forward / reverse switching shaft (44) projecting from the projecting port (48) of the bottom (26).
7) is rotated in the forward direction to engage the ratchet pole (42) in the forward direction with the internal gear (36) of the ratchet yoke (21). Next, by holding the motor housing (24) and pressing the throttle lever (25), the drive mechanism is rotated to rotate the crankshaft (34) in one direction. Due to the rotation of the crankshaft (34), the bush (35) at the tip of the crankshaft (34) causes an arcuate recess of the ratchet yoke (21).
The ratchet yoke (21) repeats the reciprocal rotation in the forward and reverse directions because it makes a circular motion in (33).

When the ratchet yoke (21) swings in the positive direction, the ratchet pole (4
Since 2) is strongly engaged with the internal gear (36) of the ratchet yoke (21), the ratchet anvil (22) and the ratchet yoke (21) resist the frictional resistance with the housing body (20). Rotate integrally in the forward direction. On the other hand, when the ratchet yoke (21) swings in the opposite direction, the ratchet pole (42) and the internal gear (36) do not engage in this opposite direction, and the ratchet yoke (21) and the ratchet anvil (2) are not engaged.
The ratchet anvil (22) is rotatable relative to (2), and only a small rotational force in the opposite direction acts on the ratchet anvil (22).

Therefore, the ratchet anvil (22) does not rotate in the opposite direction due to the frictional resistance force generated between the ratchet anvil (22) and the housing body (20). In this way, the housing body (20) favorably prevents the ratchet anvil (22) from rotating in the opposite direction, so that the ratchet yoke (21) is reciprocally rotated forward and backward. Only converted to rotation. And ratchet anvil
The jig connected to the jig fixing portion (37) of (22) can be smoothly rotated in the positive direction.

To prevent the ratchet anvil (22) from rotating in the reverse direction, as described above, the elastic bodies (39) (40) arranged in the housing body (20) press and urge the ratchet anvil (22). When these are elastic body (39)
This is performed by the frictional resistance force generated at the contact portion between the bottom portion (26) of the housing body (20) and the lid body (30) and the ratchet anvil (22) via (40). When a large rotational force is applied from the ratchet yoke (21), the ratchet anvil (22) rotates in the positive direction against the frictional resistance force. This rotation causes the ratchet anvil to rotate.
A large load due to friction is applied to the contact portion between (22) and the housing body (20). Due to this large load, in the housing body (1) of the prior art, the support wall (4) is gradually curved and deformed outward, and the support wall (4) prevents the ratchet anvil (8) from rotating in the opposite direction. The function was sometimes impaired.

However, in the present invention, the housing body (2
(0) has a U-shaped cross section to make it structurally robust, and a lid (30) for connecting to the housing body (20).
Also, it is connected with three screws (32). Therefore, the bottom portion (26) and the lid body (30) of the housing body (20) are not easily deformed even when subjected to a large friction resistance force when the ratchet anvil (22) is rotated, and the ratchet anvil (2) is not deformed.
The function of preventing rotation in the opposite direction of 2) can be maintained for a long time. Then, it is possible to obtain the ratchet wrench which is capable of smoothly rotating the jig and has excellent durability.

When the jig is rotated in the reverse direction, the ratchet pole (42) is engaged in the reverse direction contrary to the above. Then, the drive mechanism is driven to drive the ratchet yoke.
When the ratchet yoke (21) swings in the positive direction when the ratchet (21) is swung back and forth, the ratchet anvil (22) is prevented from swinging in the positive direction due to the frictional resistance with the housing body (20). It Then, when the ratchet yoke (21) swings in the opposite direction, the ratchet pole to the internal gear (36) is
Due to the engagement of (42), the ratchet anvil (22) rotates in the opposite direction integrally with the ratchet yoke (21) against the frictional resistance with the housing body (20). By preventing the rotation in the forward direction, the ratchet anvil (22) can be rotated only in the reverse direction.

[0030]

Since the present invention is configured as described above, when the ratchet anvil is rotated in either one of the forward and reverse directions, the ratchet anvil is surely rotated in the direction opposite to the intended direction. It is possible to prevent the jig from rotating smoothly in one direction.
In addition, since the housing body is formed in a box shape with a U-shaped cross section, the housing body is structurally more robust, and the housing body is easily deformed even when a heavy load is applied when the ratchet anvil rotates. There is nothing. Therefore, the housing main body can always apply a constant pressing force to the ratchet anvil without changing, and the function of preventing the ratchet anvil from rotating in the opposite direction can be maintained for a long time. Further, since the housing body is structurally robust, it is not necessary to perform forging with high technology and labor at the time of manufacturing the ratchet wrench, and it is possible to save the manufacturing labor and obtain a low-priced product.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an assembled state of an example.

FIG. 3 is an exploded perspective view of a conventional example.

[Explanation of symbols]

20 housing body 21 ratchet yoke 22 Ratchet Anvil 28 openings 30 lid 37 Jig fixing part 39 Elastic body 40 elastic body

Claims (3)

[Claims] 1. A ratchet wrench in which a ratchet anvil inserted and arranged in the ratchet yoke is rotated only in one of forward and reverse directions by reciprocating rotation of the ratchet yoke, and the jig is rotatable in one direction. The housing body is formed into a box-shaped box having a U-shaped cross-section with an opening. The ratchet yoke and the ratchet anvil are incorporated and housed in the housing body, and the opening is covered with a lid. A ratchet wrench characterized in that a jig fixing portion of a ratchet anvil is projected from the body to the outside, and an elastic body can press and urge the ratchet anvil toward the inside of the housing body. 2. The elastic body is housed in the housing body,
The ratchet wrench according to claim 1, wherein the ratchet anvil can be pressed and biased. 3. The ratchet wrench characterized in that the elastic body causes the lid body to retain elastic force, and the ratchet anvil is pressed and urged by the elastic lid body.