JP7337365B2 - wrench - Google Patents

Description

The present invention relates to wrenches.

Conventionally, when one member having a female thread and the other member having a male thread are screwed together, the outer periphery of each member (for example, a D-cut portion, etc.) is gripped with a spanner, and two It is common to tighten with a double wrench that rotates wrenches relative to each other (see, for example, Patent Document 1).

JP-A-52-89898

However, when the two members are screwed together by the above-described method, the operator has different wrenches in each hand, so even if the members sway, the swaying cannot be suppressed. was there. In addition, when repeatedly attaching and detaching both members, there is a problem that both hands are occupied each time the wrench is held, which deteriorates workability.

Therefore, there arises a technical problem to be solved in order to provide a wrench with excellent convenience, and an object of the present invention is to solve this problem.

In order to achieve the above object, a wrench according to the present invention comprises a fixed wrench portion having a fixed chuck capable of gripping the outer periphery of a fixed side member, and a fixed wrench portion arranged coaxially with the center of the fixed chuck. and a ratchet mechanism for regulating the rotation direction of the rotary chuck, the rotary chuck being rotatable around the rotary shaft and capable of gripping the outer periphery of a movable member; A ratchet wrench section connected to a fixed wrench section, and a torsion spring that biases the fixed wrench section and the ratchet wrench section in a direction to open them, wherein the ratchet mechanism comprises the fixed wrench section and the ratchet wrench section. When an external force acts in the closing direction, the external force is transmitted to the rotating chuck to rotate it, and when the biasing force of the torsion spring acts in the direction of opening the fixed wrench portion and the ratchet wrench portion, the ratchet wrench portion It rotates freely with respect to the rotating chuck.

According to this configuration, when an operator grips the fixed wrench part and the ratchet wrench part with one hand and grips the ratchet wrench part so as to approach the fixed wrench part and applies an external force, the rotary chuck moves to the fixed chuck. When the member gripped by the rotary chuck is tightened by relative rotation, and the external force is removed, only the ratchet wrench part separates from the fixed wrench part without rotating the rotary chuck. By repeatedly opening and closing the ratchet wrench part with respect to the fixed wrench part in this way, the operator can tighten the member held by the rotary chuck with one hand to the member held by the fixed chuck.

Further, in the wrench according to the present invention, the fixed wrench portion includes a shaft to which the fixed chuck is connected at the tip ; a coil spring that is housed in the housing hole and between the rear end of the shaft and the grip and biases the shaft in a direction to push the shaft out of the grip; A shift lever extending to the outside of the grip and capable of slidably operating the shaft in a direction to house the shaft in the grip against the biasing force of the coil spring is preferably provided.

According to this configuration, the fixed chuck can be protruded from the grip and gripped on the outer periphery of the member, or the fixed chuck can be retracted from the member according to the sliding operation of the shaft.

In the wrench according to the present invention, the ratchet wrench portion is connected to the fixed wrench portion via the torsion spring, and one end side is attached to the fixed wrench portion so as to be rotatable around the rotation axis. a bracket rotatably accommodating the shaft portion of the movable lever at the other end side; and a clutch mechanism capable of switching on and off torque transmission from the movable lever to the bracket, wherein the clutch mechanism moves the movable lever. When the torque input via the movable lever is below a predetermined threshold value, the movable lever and the bracket are rotated together, and when the torque input via the movable lever is equal to or greater than the threshold value, the movable lever is It preferably rotates freely with respect to said bracket.

According to this configuration, since the clutch mechanism suppresses the member from being damaged by excessive torque, the member gripped by the rotating chuck can be easily tightened to the member gripped by the stationary chuck.

Further, in the wrench according to the present invention, the clutch mechanism is provided on the outer periphery of the shaft portion, and includes a first roller that moves with rotation of the movable lever, and a clutch mechanism that rotates with respect to the first roller in the radial direction. a second roller provided on the bracket on the outer side of the second roller and the outer periphery of the shaft portion on the opposite side of the first roller with the second roller therebetween, and the second roller is fitted to the outer periphery of the shaft portion in the radial direction and a substantially C-shaped ring-shaped spring that biases the inner side of the first roller and the second roller when the torque input via the movable lever is below a predetermined threshold value When the movable lever and the bracket are engaged, the movable lever and the bracket rotate together, and the torque input via the movable lever is equal to or greater than the threshold value, the second roller retreats outward in the radial direction, and the Preferably, the first roller separates from the second roller, allowing the movable lever to rotate freely with respect to the bracket.

According to this configuration, a torque exceeding the elastic force of the ring-shaped spring is suppressed from acting on the rotating chuck, so that the member gripped by the rotating chuck can be easily tightened to the member gripped by the stationary chuck.

In the wrench according to the present invention, the ratchet mechanism includes ratchet teeth provided on the outer circumference of the rotary chuck, floating claws provided on the bracket and engageable with the ratchet teeth, and the floating claws. a coil spring that biases the ratchet teeth toward the ratchet teeth, and when an external force acts in a direction to close the fixed wrench portion and the ratchet wrench portion, the floating pawl engages the ratchet teeth, and the bracket and the rotating When the chuck rotates integrally and the biasing force of the torsion spring acts in a direction to open the fixed wrench portion and the ratchet wrench portion, the floating pawl is disengaged from the ratchet teeth and the bracket is freed from the rotary chuck. It is preferable to rotate at

According to this configuration, when an operator grips the ratchet wrench portion so as to approach the fixed wrench portion and applies an external force, the floating pawl engages the ratchet teeth, and the rotary chuck rotates relative to the fixed chuck. When the member gripped by the rotary chuck is tightened and the external force is removed, the rotary chuck does not rotate and only the ratchet wrench part separates from the fixed wrench part, so the fixed chuck can grip the member held by the rotary chuck with one hand. It can be clamped to a member that

According to the present invention, when an operator grips the fixed wrench part and the ratchet wrench part with one hand and grips the ratchet wrench part so as to approach the fixed wrench part and applies an external force, the rotary chuck moves to the fixed chuck. When the member gripped by the rotary chuck is tightened by relative rotation, and the external force is removed, only the ratchet wrench part separates from the fixed wrench part without rotating the rotary chuck. By repeatedly opening and closing the ratchet wrench part with respect to the fixed wrench part in this way, the operator can tighten the member held by the rotary chuck with one hand to the member held by the fixed chuck.

1 is a perspective view showing a wrench according to one embodiment of the present invention; FIG. The top view which shows a wrench. The side view which shows a wrench. The bottom view which shows a wrench. AA sectional view of the wrench. FIG. 4 is a perspective view showing the wrench with the cover removed; FIG. 4 is a plan view showing the wrench with the cover removed; FIG. 2 is an enlarged view of a main part showing a ratchet mechanism; FIG. 2 is an enlarged view of a main part showing a clutch mechanism; Assembly drawing of the fixed wrench part. The assembly drawing which shows a mode that a bracket is assembled|attached to a fixed wrench. The assembly drawing which shows a mode that a ratchet mechanism is assembled|attached to a bracket. FIG. 4 is an assembly drawing showing how the movable lever and the clutch mechanism are assembled to the bracket. The assembly drawing which shows a mode that a cover is assembled|attached to a ratchet wrench part. The figure which shows the state (locked state) where the clutch mechanism is performing the torque transmission to the ratchet mechanism. The figure which shows the state which the torque which acts on a clutch mechanism became large excessively. The figure which shows the state (unlocked state) where the clutch mechanism is not performing the torque transmission to the ratchet mechanism. The figure which shows the state which the movable lever returns to the initial position by the biasing force of a torsion spring.

An embodiment of the present invention will be described based on the drawings. In addition, hereinafter, when referring to the number, numerical value, amount, range, etc. of the constituent elements, unless otherwise specified or clearly limited to a specific number in principle, it is limited to the specific number It does not matter if it is more than or less than a certain number.

In addition, when referring to the shape and positional relationship of components, etc., unless otherwise specified or in principle clearly considered otherwise, etc. include.

In addition, the drawings may exaggerate characteristic parts by enlarging them in order to make the characteristics easier to understand. In addition, in cross-sectional views, hatching of some components may be omitted in order to facilitate understanding of the cross-sectional structure of the components.

In the present embodiment, expressions indicating directions such as up and down, left and right are not absolute, and are appropriate when each component is in the posture depicted in the drawing. In some cases, it should be changed and interpreted according to changes in posture.

FIG. 1 is a perspective view showing a wrench 1. FIG. 2-4 are top, side and bottom views of the wrench 1. FIG. The wrench 1 grips the outer peripheries (for example, the D-cut portion) of one member having a female thread and the other member having a male thread, and is tightened with one hand by an operator. The wrench 1 is suitable for, for example, medical instruments such as end effectors that are frequently attached and detached. The wrench 1 includes a fixed wrench part 2 and a ratchet wrench part 3.

An opening 21 is formed at one end of the fixed wrench portion 2 so that the outer periphery of the member can be gripped. A grip 22 that can be gripped by the operator is provided on the other side of the fixed wrench portion 2 .

One end of the ratchet wrench portion 3 is formed with an opening 31 through which the outer circumference of the member can be gripped. A movable lever 32 that can be gripped by the operator is provided on the other side of the ratchet wrench portion 3 . Reference numeral 33 denotes a cover mounted on the ratchet wrench portion 3 so as to cover the ratchet mechanism 7 and the clutch mechanism 8, which will be described later.

A torsion spring 4 is provided so as to bridge between the grip 22 and the movable lever 32 . The torsion spring 4 urges the fixed wrench part 2 and the ratchet wrench part 3 in a direction to separate them from each other.

5 is a cross-sectional view taken along the line AA in FIG. 3. FIG. The fixed wrench part 2 includes a grip 22 , a fixed chuck 23 , a shaft 24 and a first coil spring 25 .

The grip 22 has an accommodation hole 22a extending in the longitudinal direction from the distal end side by a predetermined length.

An opening 21 is formed in the fixed chuck 23 . The width dimension of the opening 21 is set according to the diameter of the member to be gripped. A fixed chuck 23 is provided at the tip of the shaft 24 .

A shift lever 26 is connected to the middle of the shaft 24 . The shift lever 26 is provided perpendicular to the longitudinal direction of the shaft 24 . A portion of the shift lever 26 extends to the outside of the grip 22 . As a result, the shaft 24 can be slid in conjunction with the slide operation of gripping and sliding the shift lever 26 by the operator.

A positioning recess (not shown) for positioning and fixing the shift lever 26 at a position of the shift lever 26 corresponding to the position (tightening position) where the fixed chuck 23 grips the member is formed in the grip 22, and the shift lever 26 is positioned in the positioning recess. It is preferable to configure so that the fixing chuck 23 is positioned at a position for gripping the member by fitting.

The first coil spring 25 is accommodated in the accommodation hole 22 a and biases the shaft 24 in a direction to push it out of the grip 22 . Here, when the shift lever 26 is moved from the positioning recess in the direction of compressing the first coil spring 25, the fixed chuck 23 can be retracted from the member.

FIG. 6 is a perspective view showing the wrench 1 with the cover 33 removed. 7 is a plan view showing the wrench 1 of FIG. 6. FIG. The ratchet wrench part 3 includes a bracket 5 , a rotating chuck 6 , a ratchet mechanism 7 and a clutch mechanism 8 .

The bracket 5 is configured to be rotatable relative to the fixed wrench portion 2 around the rotary shaft 61 of the rotary chuck 6 . The bracket 5 accommodates the rotary chuck 6 in a first holder 51 provided on the distal end side, and accommodates the shaft portion 32a of the movable lever 32 in a second holder 52 provided on the proximal end side.

Inside the first holder 51 , the rotary chuck 6 is housed so as to be rotatable around its rotary shaft 61 . Further, in the second holder 52, the shaft portion 32a is accommodated so as to be rotatable around its center.

The rotary chuck 6 is formed with an opening 31 having a predetermined width from the outer periphery to the center. The width dimension of the opening 31 is set according to the diameter of the member to be gripped. The rotary shaft 61 of the rotary chuck 6 is arranged so as to substantially coincide with the center of the fixed chuck 23 at the tightening position when viewed from above. Ratchet teeth 62 are formed on the outer circumference of the rotary chuck 6 .

FIG. 8 is a diagram showing the rotating chuck 6 and the ratchet mechanism 7. FIG. The ratchet mechanism 7 has ratchet teeth 62 , a floating pawl 71 and a second coil spring 72 .

The floating pawl 71 includes a round, protruding base portion 73 and a pawl portion 74 having a substantially L-shaped tip. The base portion 73 is accommodated in the base portion accommodation hole 53 of the bracket 5 , and the floating claw 71 is configured to be able to swing slightly around the base portion 73 .

A second coil spring 72 is interposed between the bracket 5 and the floating claw 71 . The second coil spring 72 biases the floating pawl 71 toward the rotary chuck 6 so as to engage the pawl portion 74 with the ratchet teeth 62 . As a result, the claw portion 74 allows the rotating chuck 6 to rotate clockwise (tightening direction) on the paper surface of FIG. 8, but restricts it from rotating counterclockwise.

Two floating claws 71 are provided along the circumferential direction of the rotary chuck 6 at intervals. As a result, even when the rotary chuck 6 rotates until the opening 31 reaches one of the floating claws 71 as the members are tightened, the other floating claw 71 can be kept engaged with the ratchet teeth 62 . , in other words, at least one floating pawl 71 can be maintained in constant engagement with the ratchet teeth 62 . The number of floating claws 71 is not limited to two.

9 is a diagram showing the clutch mechanism 8. FIG. The clutch mechanism 8 includes a first roller 81 , a second roller 82 , a third coil spring 83 and a ring-shaped spring 84 .

The first roller 81 and the second roller 82 are needle rollers. A first roller 81 and a second roller 82 are arranged in this order from the inside toward the outside in the radial direction of the shaft portion 32a.

The first roller 81 is accommodated in a spring accommodation hole 34 opened to the outer circumference of the shaft portion 32a and a restricting groove 52a formed in the inner circumference of the second holder 52. As shown in FIG.

The second roller 82 is accommodated in a communicating hole 52c formed from the restricting groove 52a of the second holder 52 to the outer peripheral surface 52b. The second roller 82 is offset from the first roller 81 in the circumferential direction of the shaft portion 32a.

The third coil spring 83 is housed in the spring housing hole 34 and biases the first roller 81 radially outward of the shaft portion 32a. The spring housing hole 34 is inclined with respect to the radial direction of the shaft portion 32a.

A pair of the first roller 81, the second roller 82, and the third coil spring 83 are arranged on both sides of the axis of the shaft portion 32a.

The ring-shaped spring 84 is formed in a C shape when viewed from above. The ring-shaped spring 84 is arranged on the opposite side of the first roller 81 via the second roller 82 and is fitted to the outer circumference of the shaft portion 32a. The material and thickness of the ring-shaped spring 84 are set so as to exhibit an elastic force corresponding to a predetermined threshold for turning off torque transmission to the ratchet mechanism 7, as will be described later.

Next, a procedure for assembling the wrench 1 will be described with reference to the drawings.

[Assembly of fixed wrench part]
As shown in FIG. 10, the fixed chuck 23 and the shaft 24 are joined, and the shaft 24 is inserted into the grip 22 with the first coil spring 25 interposed therebetween. Further, the shift lever 26 is attached to the shaft 24 by screwing the tip of the shift lever 26 into the bolt hole 24 a of the shaft 24 while the shaft 24 is accommodated in the grip 22 .

[Bracket mounting]
As shown in FIG. 11, the bracket 5 is attached to the fixed wrench part 2. As shown in FIG. Specifically, a slit (not shown) formed in the first holder 51 is fitted to the restricting portion 28 projecting from the outer periphery of the opening 27 at the tip of the grip 22 . The arc dimension of the slit is set longer than the arc dimension of the restricting portion 28 . A regulation cover 54 is fastened to the regulation portion 28 with bolts 55 , and the regulation portion 28 and the bracket 5 are connected via the regulation cover 54 . Thereby, the bracket 5 can be rotated by the difference in arc dimension between the slit and the restriction portion 28 .

[Ratchet mechanism assembly]
As shown in FIG. 12, the ratchet mechanism 7 is assembled with the bracket 5 . Specifically, the rotating chuck 6 is arranged in the first holder 51 . Further, the base portion 73 of the floating pawl 71 is accommodated in the base portion accommodation hole 53 , and the substantially L-shaped pawl portion 74 is engaged with the ratchet teeth 62 to bias the pawl portion 74 toward the ratchet teeth 62 . A second coil spring 72 is provided between the floating claw 71 and the bracket 5.

[Clutch mechanism assembly]
As shown in FIG. 13, the movable lever 32 and the clutch mechanism 8 are assembled to the bracket 5. As shown in FIG. Specifically, the shaft portion 32 a of the movable lever 32 is arranged in the second holder 52 while the first roller 81 and the third coil spring 83 are accommodated in the spring accommodation hole 34 . Then, the second roller 82 is accommodated in the communication hole 52c, and the ring-shaped spring 84 is fitted around the outer circumference of the shaft portion 32a.

[Cover attachment]
As shown in FIG. 14 , the cover 33 is attached to the bracket 5 with bolts 36 to close the bracket 5 with the cover 33 . This prevents foreign matter from entering the ratchet mechanism 7 and the clutch mechanism 8 .

A torsion spring 4 is provided so as to straddle the fixed wrench portion 2 and the ratchet wrench portion 3 . Thereby, the wrench 1 as shown in FIG. 1 can be obtained.

Next, the action of the wrench 1 will be described with reference to the drawings. A case will be described below in which the movable member is rotated relative to the fixed member and these members are tightened.

[Wrench attachment]
When no external force acts on the wrench 1, the fixed wrench portion 2 and the ratchet wrench portion 3 are separated from each other by the biasing force of the torsion spring 4 (initial state).

Next, the opening 21 of the fixed chuck part 2 is fitted to the outer circumference of the fixed side member, the fixed chuck 23 grips the fixed side member, and the opening 31 of the ratchet wrench part 3 is attached to the outer circumference of the movable side member. , and the rotating chuck 6 grips the member on the movable side.

[Torque transmission]
When an operator or the like grips the grip 22 and the movable lever 32 and an external force acts to close them against the biasing force of the torsion spring 4, the torque input via the movable lever 32 is applied to the clutch mechanism 8. transmitted.

The clutch mechanism 8 transmits torque input via the movable lever 32 to the ratchet mechanism 7 . Specifically, as shown in FIG. 15, the first roller 81 engages the second roller 82 when the shaft portion 32a rotates around its center clockwise on the paper surface of FIG. At this time, the ring-shaped spring 84 urges the second roller 82 radially inward of the shaft portion 32 a so that the second roller 82 is pushed out by the first roller 81 in the radial direction of the shaft portion 32 a. Restrict sliding outwards. As a result, the bracket 5 is integrated with the movable lever 32 via the first roller 81 and the second roller 82 , and rotates around the rotary shaft 61 in conjunction with the rotation of the movable lever 32 . The spring housing hole 34 is inclined with respect to the radial direction of the shaft portion 32a, and the third coil spring 83 is not compressed during torque transmission.

When the bracket 5 rotates clockwise (tightening direction) around the rotary shaft 61 on the paper surface of FIG. By rotating, the member on the movable side is tightened to the member on the fixed side.

When the external force is removed, the torsion spring 4 biases the movable lever 32, and the fixed wrench portion 2 and the ratchet wrench portion 3 return to the initial state shown in FIG.

Then, the movable lever 32 and the bracket 5 are integrally rotated around the rotary shaft 61 . However, since the floating pawl 71 is disengaged from the ratchet teeth 62 , the rotary chuck 6 does not follow the rotation of the movable lever 32 and does not rotate. By repeating such operations, the movable side member is gradually tightened to the fixed side member.

[Torque transmission off]
The clutch mechanism 8 cuts off torque transmission to the ratchet mechanism 7 when the tightening between the movable-side member and the fixed-side member progresses and tightening of the movable-side member requires a torque equal to or greater than a predetermined threshold.

Specifically, when excessive torque is applied while the first roller 81 is engaged with the second roller 82, as shown in FIG. The first roller 81 pushes up the second roller 82 radially outward of the shaft portion 32 a against the elastic force of the ring-shaped spring 84 .

As shown in FIG. 17, when the shaft portion 32a rotates further, the first roller 81 climbs over the second roller 82, the first roller 81 separates from the second roller 82, and is out of contact with the shaft portion 32a. rotates freely with respect to the bracket 5, and the rotating chuck 6 does not rotate. As a result, it is possible to suppress damage to the member caused by tightening the member with excessive torque.

When the external force is removed from the state of FIG. 17, the torsion spring 4 biases the movable lever 32, and the fixed wrench portion 2 and the ratchet wrench portion 3 return to their initial states.

When the movable lever 32 rotates counterclockwise on the paper surface of FIG. It is compressed, falls radially inwardly of the shaft portion 32a, climbs over the second roller 82, and returns to the initial state shown in FIG.

[Wrench removal]
When tightening is completed, the tightening member is removed from the wrench 1. Specifically, the shift lever 26 is operated to retract the fixed chuck 23 from the member on the fixed side. Next, either the fixed wrench part 2 or the ratchet wrench part 3 is rotated so that the opening 31 of the ratchet wrench part 3 substantially coincides with the opening 21 of the fixed wrench part 2 when viewed from above. Thereby, the rotary chuck 6 can be retracted from the member on the movable side.

In this manner, the wrench 1 according to the present embodiment is gripped by an operator holding the fixed wrench part 2 and the ratchet wrench part 3 with one hand, and the operator holds the ratchet wrench part 3 close to the fixed wrench part 2. When an external force is applied to the rotating chuck 6, the rotating chuck 6 rotates relative to the fixed chuck 23 to clamp the member gripped by the rotating chuck 6. When the external force is removed, the rotating chuck 6 does not rotate and only the ratchet wrench part 3 moves. Move away from the fixed wrench part 2. By repeatedly opening and closing the ratchet wrench portion 3 with respect to the fixed wrench portion 2 in this way, the operator can tighten the movable side member to the fixed side member with one hand.

Furthermore, the present invention can be modified in various ways without departing from the spirit of the present invention, and the present invention extends to such modifications.

Reference Signs List 1 Wrench 2 Fixed wrench portion 21 Opening 22 (of fixed wrench portion) Grip 22a Accommodating hole 23 Fixed chuck 24 Shaft 24a Bolt Hole 25 First coil spring 26 Shift lever 27 Opening 28 (of grip) Regulating portion 3 Ratchet wrench portion 31 Opening 32 (of ratchet wrench portion) ... movable lever 32a ... shaft portion 33 ... cover 34 ... spring housing hole 4 ... torsion spring 5 ... bracket 51 ... first holder 52 ... second holder 53 ... base housing hole 54 ... regulation cover 55 ... bolt 6 ... rotary chuck 61 ... rotary shaft 62 ... ratchet tooth 7 ... ratchet mechanism 71 ... floating pawl 72 ... second coil spring 73 ... base portion 74 ... claw portion 8 ... clutch mechanism 81 ... first roller 82 ... second roller 83 ... third coil spring 84・・・Ring-shaped spring

Claims (5)

a wrench,
a fixed wrench portion having a fixed chuck capable of gripping the outer periphery of the fixed side member ;
A rotating chuck that is rotatable around a rotating shaft arranged coaxially with the center of the fixed chuck and capable of gripping the outer periphery of a member on the movable side, and a ratchet mechanism that regulates the rotating direction of the rotating chuck, a ratchet wrench part connected to the fixed wrench part so as to be openable and closable about the rotating shaft;
a torsion spring that biases the fixed wrench part and the ratchet wrench part in a direction to open them;
with
In the ratchet mechanism, when an external force acts in a direction to close the fixed wrench portion and the ratchet wrench portion, the external force is transmitted to the rotary chuck to rotate it, and the fixed wrench portion and the ratchet wrench portion are rotated in a direction to open the fixed wrench portion and the ratchet wrench portion. A wrench, wherein the ratchet wrench part rotates freely with respect to the rotary chuck when the biasing force of a torsion spring acts. The fixed wrench part
a shaft to which the fixed chuck is connected at the tip ;
a grip formed with an accommodation hole that accommodates the shaft slidably along the longitudinal direction ;
a coil spring accommodated in the accommodation hole and between the rear end of the shaft and the grip, and biasing the shaft in a direction to push the shaft out of the grip;
a shift lever connected to the middle of the shaft and extending to the outside of the grip and capable of sliding the shaft in a direction to accommodate the shaft in the grip against the urging force of the coil spring;
2. The wrench of claim 1, comprising: The ratchet wrench part is
a movable lever connected to the fixed wrench portion via the torsion spring;
a bracket whose one end side is attached to the fixed wrench part so as to be rotatable around the rotating shaft and whose other end side is rotatably housing the shaft part of the movable lever;
a clutch mechanism capable of switching on and off torque transmission from the movable lever to the bracket;
with
The clutch mechanism rotates the movable lever and the bracket together when the torque input via the movable lever is below a predetermined threshold, and the torque input via the movable lever is equal to or greater than the threshold. 3. The wrench according to claim 1, wherein said movable lever rotates freely with respect to said bracket in the case of . The clutch mechanism is
a first roller provided on the outer periphery of the shaft portion and moving with the rotation of the movable lever;
a second roller provided on the bracket outside the radial direction with respect to the first roller;
a substantially C-shaped ring-shaped spring that is fitted to the outer periphery of the shaft portion on the opposite side of the first roller with the second roller therebetween and biases the second roller inward in the radial direction; ,
with
When the torque input through the movable lever is below a predetermined threshold value, the first roller and the second roller are engaged, the movable lever and the bracket rotate together, and the movable lever is When the torque input via the bracket is equal to or greater than the threshold value, the second roller is retracted to the outside in the radial direction, the first roller is separated from the second roller, and the movable lever is moved to the bracket. 4. The wrench of claim 3, wherein the wrench rotates freely with respect to the The ratchet mechanism is
Ratchet teeth provided on the outer periphery of the rotary chuck;
a floating pawl provided on the bracket and engageable with the ratchet teeth;
a coil spring that biases the floating pawl toward the ratchet teeth;
with
When an external force acts in a direction to close the fixed wrench portion and the ratchet wrench portion, the floating pawl engages the ratchet teeth, the bracket and the rotary chuck rotate together, and the fixed wrench portion and the ratchet wrench portion rotate. 5. The bracket according to claim 3 or 4, wherein when the biasing force of the torsion spring acts in the direction of opening the part, the floating pawl is disengaged from the ratchet teeth and the bracket rotates freely with respect to the rotary chuck. wrench.

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