JP2004034271A - Spanner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a useful spanner capable of fitting from the side on a rotated body such as a bolt head or a nut having polygonal cross-section, and fastening and releasing the rotated body by being reciprocally turning in the engagement state. <P>SOLUTION: This spanner comprises a handle part 1, a fixing bifurcated part 2 formed continuous with the handle part including first and second fixing arm parts 21, 22, and an opening variable bifurcated part 3 including first and second engaging arm parts 31, 32 formed between the fixing arm parts. One end parts 311, 321 of the engaging arm parts 31, 32 are connected turnably to each other, free end parts 312, 322 face to an opening part S1 between the fixing arms, and an opening is variable around a turnable connection part 30. The inner faces of the engaging arm parts 31, 32 and the fixing arm part 22 have recessed step parts 317a, 318, 33, 325a, 225 and 226 capable of engaging and disengaging with angular parts C of the rotated body W. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a spanner for rotating a rotating body such as a bolt head or a nut having a polygonal cross section.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a turning tool called a wrench, a spanner, or the like as a tool for turning a rotating body such as a bolt head or a nut having a polygonal cross-sectional shape into a tightened state or loosening the tightened state from the tightened state.
[0003]
Such conventional turning tools are roughly classified into a type which is fitted to a rotated body such as a bolt head and a nut from above, and a type which is fitted from the side of the rotated body.
[0004]
A turning tool of a type to be fitted into the rotated body from above includes a box wrench, a socket wrench capable of replacing a portion to be fitted and engaged with the rotated body, and a hole having a hole to be fitted and engaged with the rotated body from above. 2. Description of the Related Art A wrench or the like is known, and a wrench having a bifurcated portion that is fitted into and engaged with a rotated body from the side is known as a rotating tool that is fitted into the rotated body from the side.
[0005]
In addition, a turning tool, such as a box wrench, a socket wrench, or a perforated wrench, fitted with a rotating tool from above has a ratchet mechanism, and torque is applied to the rotating tool only when the turning tool is turned in one direction. In some cases, the turning tool can be reciprocated and rotated while being fitted and engaged with the rotating body to tighten or loosen the rotated body.
[0006]
[Problems to be solved by the invention]
However, a rotating body such as a bolt and a nut is provided in various parts such as various machines and vehicles, and is often provided in a part where a turning tool cannot be fitted and engaged from above the rotated body.
[0007]
In such a case, it is necessary to use a wrench having a bifurcated portion that can be engaged with the rotated body from the side thereof. There is no mechanism such as a ratchet mechanism that can be moved to tighten or loosen the rotating object. Therefore, the spanner is turned within a range permitted according to the situation of an obstacle around the rotated object, and then temporarily removed from the rotated object, re-engaged with the rotated object, and turned again, which is troublesome and troublesome. Such work must be repeated.
[0008]
Therefore, the present invention is capable of fitting and engaging a rotated body such as a bolt head or a nut having a polygonal cross section from the side, and reciprocatingly rotating the tightened or loosened body while maintaining the engaged state. It is an object to provide a convenient spanner that can perform
[0009]
Another object of the present invention is to provide a spanner that can be manufactured with a simple structure with a small number of parts and can be manufactured at a low cost.
[0010]
Another object of the present invention is to provide an easy-to-use spanner.
[0011]
[Means for Solving the Problems]
The present invention provides the following wrench.
[0012]
A spanner according to the present invention includes a handle portion, a fixed forked portion continuously connected to at least one end of the handle portion, and a variable opening degree forked portion disposed in the fixed forked portion.
[0013]
The fixed bifurcated portion includes first and second fixed arm portions facing each other, and between the fixed arm portions, a rotating body such as a bolt head or a nut having a polygonal cross section is fitted from the side thereof. It has an opening between the free ends of the detachable fixed arms and a space continuous with the opening.
[0014]
The variable opening bifurcated portion includes first and second engaging arms disposed between the first and second fixed arms, and the first and second engaging arms are rotated. This is for externally engaging the body from the side.
[0015]
One ends of the first and second engagement arms are rotatably connected to each other in a space between the fixed arms, and a separated free end faces an opening between the fixed arms. The opening is variable with the rotatable connecting portion as the center.
[0016]
At least one of the first and second engaging arm portions has a concave step portion which can be engaged and disengaged with a corner portion of the rotated member having a polygonal cross section on the inner surface.
[0017]
The first and second engagement arm portions are such that their rotatable connection portions are slightly movable (slightly reciprocable) between the first and second fixed arm portions, and the first and second engagement arm portions are entirely the first and second engagement arm portions. It is slightly rotatable (slightly reciprocally rotatable) with respect to the fixed arm portion.
[0018]
The rotatable connecting portion is provided with a biasing force by a spring in a direction in which it contacts the first fixed arm portion.
[0019]
According to this wrench, the resistance to the rotation between the opening of the fixed forked portion and the first and second engagement arms of the variable opening degree forked portion is so large that it is difficult to rotate without using a turning tool, for example. By rotating the handle portion toward the first fixed arm portion relative to the rotated body around the rotated body in a state where the rotated body having the rotation is fitted, the first and second rotating members are opposed to the spring. The first and second engaging arms are entirely disposed on the first and second fixed arms in such a manner that the first and second fixed arms are arranged such that the rotatable connecting portion of the engaging arm approaches the second fixed arm. It turns slightly in a direction relatively opposite to the turning direction toward the fixed arm. With the further rotation of the handle in the same direction, the first engagement arm retreats toward the first fixed arm so that the peak adjacent to the concave step can ride over the corner of the rotating body. After taking the position, the elastic restoring force of the spring may again take a position that allows the concave step of the first and / or second engaging arm to return to engagement with the corner of the rotating body. it can.
[0020]
Here, the retracted position means that the first engagement arm portion is moved along with further rotation of the handle portion toward the first fixed arm portion side and the concave portion of at least one of the inner surfaces of the first and second engagement arm portions is formed. This is a position where the mountain portion adjacent to the step portion retreats toward the first fixed arm portion side so as to be able to climb over the corner portion of the rotating body.
[0021]
The engagement position is a position where the concave steps of the first and second engagement arms are allowed to engage the corners of the rotating body.
[0022]
In the state where the first engagement arm can take the retreat position or the engagement position as described above, the first engagement arm is moved to the retreat position with the turning operation of the handle toward the first fixed arm. And the engaging position can be repeatedly reciprocated, whereby the handle portion is rotated by an arbitrary angle to the first fixed arm portion side to form the concave step portion in the first and / or second engaging arm portion. It can be engaged with the corner of the rotated body.
[0023]
Further, in a state where the concave step portion of the first and / or second engagement arm portion is engaged with the corner of the rotating body, the handle portion is moved toward the second fixed arm relative to the rotating body. By turning, the rotatable connecting portions of the first and second engaging arms abut against the first fixed arm with the help of the spring. This abutment is such that the entire first and second engaging arms are relatively opposite to the first and second fixed arms relative to the direction of rotation of the handle toward the second fixed arm. This is done by slightly turning.
[0024]
Further, by rotating the handle in the same direction, the fixed forked portion and the variable opening degree forked portion both rotate together with the handle portion while the first and second engagement arms are engaged with the rotating body. The body can be rotated, and when the rotated body is a bolt head or a nut, it can be tightened or loosened.
[0025]
The spanner according to the present invention can be manufactured in a simple structure with a small number of parts, and can be manufactured at a low cost.
[0026]
Further, the spanner according to the present invention can be easily operated with one hand, and is easy to use.
[0027]
In the spanner according to the present invention, the inner surfaces of both engaging arms from the free end of the first engaging arm to the free end of the second engaging arm have a concave curved surface as a whole (representative). In a continuous concave curved shape). In this case, the concave step portion which can be engaged and disengaged with the corner of the rotating body can be formed on the concave curved inner surface. In any case, at least one concave step is provided on the inner surface of at least one of the first and second engagement arms, but a plurality of concave steps may be formed as necessary.
[0028]
Further, the concave step may be formed on the inner surface of the second fixed arm. The concave step is also formed at a mutual meeting portion between the inner surfaces of the first and second engaging arm portions and a mutual meeting portion between the inner surface of the second fixed arm portion and the inner surface of the second engaging arm portion. Is also good.
[0029]
In any case, when a plurality of concave steps are provided, it is conceivable that each of the concave steps is disposed at a position where at least every other concave step can engage with a corner of the rotating body and hold the rotated body. Can be
[0030]
In the spanner according to the present invention, the space between the first and second fixed arms is an intermediate space that is continuous with the opening between the free ends of the fixed arms, and is continuous with the intermediate space. And a back space portion. In this case, the first and second engagement arms can be arranged such that one ends thereof are rotatably connected to each other in the deep space and extend to the intermediate space.
[0031]
Further, in the spanner according to the present invention, the first fixed arm portion is configured such that at least a part of an outer surface of a portion from the free end portion to the intermediate portion of the first engagement arm portion draws an arc and is slidable on the inner surface. And a back inner surface for contacting and supporting the rotatable connection of the first and second engagement arms.
[0032]
The second fixed arm portion has an inner surface on which at least a part of an outer surface of a portion from the free end portion to the intermediate portion of the second engaging arm portion can draw a circular arc and is slidable, and has a first and a second. An inner surface on the back side for supporting the rotatable connection portion of the second engagement arm portion via the spring may be provided.
[0033]
The outer surface of a portion from the free end to the intermediate portion of the first engaging arm portion is formed as a convex curved surface, and the first fixed arm portion is at least a part of the outer surface of the convex curved surface of the first engaging arm portion. May have an inner surface of a concave curved surface slidable in contact with the inner surface of the back side.
[0034]
The outer surface of a portion from the free end to the intermediate portion of the second engaging arm portion is formed as a convex curved surface, and the second fixed arm portion is at least a part of the outer surface of the convex curved surface of the second engaging arm portion. May have an inner surface of a concave curved surface slidable in contact with the inner surface of the back side.
[0035]
The rotatable connecting portion of the first and second engaging arms in the spanner according to the present invention is slightly movable between the first and second fixed arms, and can contact at least the first fixed arm. Note that the second fixed arm portion may be able to contact the second fixed arm portion. Regarding the contact of the rotatable connection portion with the first fixed arm portion or the second fixed arm portion, according to the rotatable connection mode,
(A) A portion of the end of the first engaging arm portion facing the first fixed arm portion can abut on the first fixed arm portion, or a portion directed to the second fixed arm portion can be second fixed. It may be able to contact the arm part,
(B) A portion of the end of the second engagement arm portion facing the first fixed arm portion can abut on the first fixed arm portion, or a portion directed to the second fixed arm portion can be second fixed. It may be able to contact the arm part,
(C) A portion of the end of the first engaging arm portion directed toward the first fixed arm portion can abut on the first fixed arm portion, or further toward the second fixed arm portion of the second engaging arm portion. May be able to contact the second fixed arm portion,
(D) A portion of the end of the second engagement arm portion facing the first fixed arm portion can abut on the first fixed arm portion, or can be further directed toward the second fixed arm portion of the first engagement arm portion. The set portion may be able to contact the second fixed arm portion.
[0036]
Various forms of rotatable connection between the ends of the first and second engagement arms can be adopted.
[0037]
For example, one end of the first and second engagement arms may be overlapped and connected so as to be rotatable with each other, or one end of one engagement arm may be connected to the other engagement arm. The ends of the portions may be connected to each other so as to be rotatably fitted. The latter connection mode is more preferable because the spanner can be made flat and compact.
[0038]
As an example of the latter connection mode, the first and second engagement arms are formed by rotatably fitting one end of the second engagement arm to one end of the first engagement arm. The case where the ends of the portions are rotatably connected to each other can be cited.
[0039]
In the spanner according to the present invention, the rotatable connecting portion of the first and second engaging arms may include a protruding portion that protrudes farther between the fixed arms. The protruding portion may be formed at an end of one of the engagement arms, which is one of the ends of the two engagement arms that constitute the rotatable connection. The spring can be mounted between the protrusion and the second fixed arm. The rotatable connection portion can abut on the first fixed arm portion at a portion of the one engagement arm portion directed to the first fixed arm portion, or can further abut on the second fixed arm portion at the protruding portion. You may be able to.
[0040]
As described above, the first and second engagement arms are connected to each other so as to be rotatable in such a manner that the end of the other engagement arm is rotatably fitted to the end of the other engagement arm. The rotatable connecting portion of the second engaging arm portion may include a protruding portion that protrudes farther between the two fixed arm portions. The other end of one of the ends of the engaging arms that rotatably fits into the protruding portion and the other of the ends of the two engaging arms that constitutes the rotatable connecting portion is rotatably fitted to the end. At the end of the engagement arm. Further, the spring can be mounted between the protrusion and the second fixed arm. The rotatable connection portion can abut on the first fixed arm portion at a portion of the other end of the engaging arm portion having the protrusion directed toward the first fixed arm portion. The second fixed arm portion can be brought into contact with the second fixed arm portion.
[0041]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0042]
FIG. 1 is an overall plan view of an example of a spanner according to the present invention, and FIG. 2 is a bottom view of the spanner. FIG. 3 is a plan view of the wrench with the upper lid removed. FIG. 4 is an enlarged plan view of a main part of the wrench with the upper lid removed.
[0043]
The spanner SP shown in FIGS. 1 to 4 has a handle portion 1, a fixed fork portion 2 integrally connected to one end of the handle portion 1, and a variable opening degree arranged in the fixed fork portion 2. And a forked part 3. Further, a first spring 4 described later is provided. The spring 4 is also arranged in the fixed forked portion 2.
[0044]
The variable opening degree forked portion 3 and the spring 4 are arranged in the fixed forked portion 2 and movably sandwiched between the upper lid portion 201 and the lower lid portion 202. The upper lid portion 201 is applied to the upper surface side (flat surface side) of the fixed forked portion 2 and is detachably provided on the fixed forked portion 2 with a screw. The lower lid portion 202 is the lower surface side (the bottom surface) of the fixed forked portion 2. Side), is formed integrally with the fixed forked portion 2 along the fixed forked portion 2.
[0045]
The fixed forked portion 2 includes first and second fixed arm portions 21 and 22 facing each other. An opening S1 between the free ends 210 and 220 of the fixed arm, an intermediate space S2 connected to the opening, and a back space S3 connected to the intermediate space are provided between the fixed arms 21 and 22. ing. The opening S1 and the intermediate space S2 can be fitted to and removed from a rotated body W (see FIG. 5 and the like) such as a bolt head and a nut having a polygonal cross section. The free end 210 and the free end 220 have opening inner surfaces 213 and 224, respectively, which are parallel to each other (see FIG. 4).
[0046]
The opening degree variable forked portion 3 includes first and second engagement arm portions 31 and 32 disposed between the first and second fixed arm portions 21 and 22. The engagement arms 31 and 32 can be externally engaged with the rotating body W from the side thereof.
[0047]
One end 311 of the first engagement arm 31 and one end 321 of the second engagement arm 32 are rotatably connected to each other in an entrance area of the back space S3 between the fixed arms. . The engagement arms 31 and 32 extend to an intermediate space S2 between the fixed arms 21 and 22. The free end 312 of the arm 31 faces the opening S1 between the fixed arms. The free end 322 of the arm 32 faces the opening S1 via the intermediate space S2. The opening degrees of the engagement arms 31 and 32 are variable with the rotatable connection 30 as a center.
[0048]
Here, the rotatable connecting portion 30 is rotatably fitted with the short cylindrical end 321 of the second engaging arm 32 in a short cylindrical hole 311a formed in the end 311 of the first engaging arm 31. It is formed flat and compact. A cutout 311b is formed in the end 311 of the arm and is continuous with the cylindrical hole 311a. The cutout 311b passes through the middle 323 of the second engagement arm 32. The first and second engagement arms 31 and 32 are rotatable with each other within a range permitted by the notch 311b.
[0049]
The first fixed arm portion 21 has an inner surface 211 in which at least a part of an outer surface 314 of a portion from the free end portion 312 to the intermediate portion 313 of the first engaging arm portion 31 draws an arc and is slidable. ing. Further, the fixed arm portion 21 has a rear inner surface 212 for contacting and supporting a portion 315 of the rotatable connection portion 30 of the first and second engagement arm portions 30 facing the first fixed arm portion 21. Have.
[0050]
Here, the outer surface 314 of the first engagement arm portion 31 is a convex curved surface, and the inner surface 211 of the first fixed arm portion 21 is a concave curved surface. The portion 315 of the rotatable connection portion 30 facing the first fixed arm portion 21 is an outer surface of a flat surface of the end portion 311 of the first engagement arm portion facing the first fixing arm portion 21 here. 315, the inner surface 212 on the far side of the fixed arm portion 21 to which it can contact is a flat surface. The inner surface 212 on the back side is a part of the inner surface of the inner space S3 between the fixed arms.
[0051]
The second fixed arm portion 22 has an inner surface 221 in which at least a part of an outer surface 324 of a portion from the free end portion 322 of the second engagement arm portion 32 to the intermediate portion 323 draws an arc and is slidable. ing. Here, the outer surface 324 of the second engagement arm portion 32 is a convex curved surface, and the inner surface 221 of the second fixed arm portion 22 is a concave curved surface.
[0052]
Further, the rear side space portion S3 has a rear side bottom surface 214 in which the protruding portion 316 of the rotatable connection portion 30 of the first and second engagement arms facing the handle portion 1 faces.
[0053]
In addition, the protruding portion 316 of the rotatable connection portion 30 facing the second fixed arm portion 22 is a protruding portion 316 of the end portion 311 of the first engagement arm portion here, which protrudes to the back side. At the same time, it is directed to the inner surface 222 on the inner side of the second fixed arm 22. An outer surface 316a of the protruding portion 316 facing the second fixed arm portion is a flat outer surface, and a spring receiving surface 223 which is a part of the inner surface 222 is formed behind the inner surface 222. The back inner surface 222 and its spring receiving surface 223 are also a part of the inner surface of the back space part S3.
[0054]
Between the spring receiving inner surface 223 and the protruding portion 316 at the end of the first engaging arm portion, a spring for imparting a biasing force for moving the rotatable connecting portion 30 toward the first fixed arm portion 21. 4 is attached.
[0055]
The continuous inner surfaces of both arm portions from the free end portion 312 of the arm portion 31 to the free end portion 322 of the arm portion 32 are formed as a concave curved surface as a whole.
[0056]
Here, the inner surface 317 of the portion from the free end 312 to the intermediate portion 313 of the engagement arm portion 31 is formed as a whole with a concave curved surface, and is capable of engaging and disengaging with the corner C of the rotating body W on the concave curved surface. It has three concave steps (a concave step 317a at the center and concave steps 318 on both sides of the concave step 317a). On the inner surface 325 of the portion from the free end 322 to the intermediate portion 323 of the engagement arm 32, a concave step 325a is formed on the concave curved surface so as to be able to engage and disengage with the corner C of the rotating body W. A concave step portion 33 that can be engaged with and disengaged from a corner portion C of the rotating body W is formed at a mutual encounter portion between the inner surfaces of the first engagement arm portion 31 and the second engagement arm portion 32. Further, the inner surface 224 of the second fixed arm portion 22 also has a concave step 225 that can be engaged with and disengaged from the corner C of the rotating member W. Also, the inner surface of the free end 322 of the second engaging arm 32 and the inner surface 224 of the second fixed arm (more precisely, the inner surface of the lower lid 202 which can be said to be a part of the second fixed arm). The concave step 226 formed by the meeting portion also has a shape that can be disengaged from the corner C of the rotating member W.
[0057]
The engagement arms 31 and 32 are configured such that their rotatable connecting portions 30 can reciprocate slightly between the inner inner surfaces 212 and 222 of the fixed arms 21 and 22, and the whole of the engagement arms 31 and 32 It can be slightly reciprocated.
[0058]
That is, in a state where the engagement arm portions 31 and 32 are not subjected to an external force, as shown in FIG. 4, the spring 4 causes the protrusion 316 at the end of the engagement arm portion 31 to move to the inner surface on the inner side of the first fixed arm portion. 212, whereby the rotatable connecting portion 30 moves toward the first fixed arm portion 21 until the outer surface 315 abuts on the inner surface 212 on the back side, and accordingly the two engaging arm portions 31 , 32 can rotate slightly counterclockwise in the figure relative to the fixed arms 21, 22.
[0059]
In this state where the outer surface 315 of the engagement arm end 311 is supported against the flat inner surface 212 of the fixed arm 21, the free end 312 of the outer surface 314 of the first engagement arm 31. Outer surface portion 314a of the first fixed arm portion 21 approaches or abuts on the concave curved inner surface 211a of the free end portion 210.
[0060]
Further, the second engaging arm portion 32 faces so that a part of the outer surface 324 approaches or abuts on the concave curved inner surface 221 of the second fixed arm portion 22.
[0061]
From the state shown in FIG. 4, an external force is applied to open the engagement arms 31 and 32 by an operation such as fitting the rotated body W to which rotation resistance is applied between the engagement arms 31 and 32. In particular, when an external force in the opening direction is applied to the first engaging arm 31, the rotatable connecting portion 30 moves toward the second fixed arm 22 against the spring 4, and the free end of the first engaging arm 22. The outer surface 314 of the portion 312 moves so as to approach the inner surface 211 of the first fixed arm portion 21, whereby the entirety of both engaging arms 31, 32 is relatively moved with respect to the fixed arms 21, 22 in FIG. Rotate slightly clockwise. Thereby, the convex outer surface portion 324a of the free end portion 322 of the second engagement arm portion 32 moves so as to approach the second fixed arm portion concave inner surface 221.
[0062]
The state shown in FIG.
(1) The two concave steps 318 of the engaging arm 31, the concave step 325a of the engaging arm 32, and the concave step 225 of the second fixed arm 22
(2) The concave step 317a of the engaging arm 31, the concave step 226 formed by the second fixed arm 22 and the second engaging arm 32, and the first engaging arm 31 and the second engaging arm. Concave portion 33 formed by portion 32
Is in a state where it is correctly engaged with the corner portion C of the rotating body W, which corresponds to a state immediately before the rotating body W is about to be rotated.
[0063]
According to the spanner SP described above, it is possible to rotate the rotating object W having a certain degree of resistance to rotation, for example, to which rotation resistance is applied to such an extent that it is difficult to rotate without using a turning tool, as follows. it can.
[0064]
First, as shown in FIG. 5 (A), the rotating body W is fitted between the opening S1 of the fixed forked portion 2 and the engagement arms 31 and 32 of the variable opening forked portion 3. At this time, the parallel opposed sides H of the rotating body W are set to be parallel to the free end inner surface 213 of the first fixed arm 21 and the free end inner surface 224 of the second fixed arm 22. At this time, the deepest corner of the corners of the rotated body W engages with the concave step 33.
[0065]
In the state of the position P <b> 1 in which the concave steps 317 a, 33 in the engaging arms 31, 32 and the concave step 326 formed by the second fixed arm 22 and the second engaging arm 32 are engaged with the corner C of the rotating body. As shown in FIG. 5B, by turning the handle portion 1 toward the second fixed arm portion 22 relative to the rotating body W, the arm portion in the rotatable connection portion 30 of the engagement arm portions 31 and 32 is rotated. The outer surface 315 of the end 311 of the first fixed arm 31 abuts on the inner surface 212 on the inner side of the first fixed arm 21 with the aid of the spring 4, and the engaging arms 31 and 32 are fixedly engaged with the rotating body W while being engaged. The part 2 and the variable opening bifurcated part 3 can rotate together with the handle part 1 to rotate the rotated object W. When the rotated object is a bolt head or a nut, tighten or loosen it. Can be.
[0066]
As shown in FIG. 5B, the concave steps 317a, 318, 33, 225, 226, 325a or the peaks 317b, 325b are formed around the center of the rotating body W correctly engaged with these concave steps. , Central angles θ = 30 ° intervals. The central angle θ is not limited to 30 °, and can be appropriately determined according to the number of sides (vertex angles of corners) of the rotating body W.
[0067]
After rotating the to-be-rotated body W by a predetermined angle, the handle portion 1 is turned toward the first fixed arm portion 21 relative to the to-be-rotated body W to resist the spring 4 as shown in FIG. As a result, the protruding portion 316 of the first arm end 311 in the rotatable connection portion 30 of the engagement arm portions 31 and 32 approaches the inner surface 222 on the rear side of the second fixed arm portion 22, and , 32 are slightly rotated in a direction relatively opposite to the rotation direction of the handle portion 1 while being in contact with and sliding on the inner surfaces 211, 221 of the fixed arm portions 21, 22. Then, as the first engaging arm 31 further rotates the handle 1 in the same direction, the peak 317b or 325b adjacent to the concave steps 33, 317a, 226 of the engaging arms 31, 32 is covered. In order to be able to get over the corner C of the rotating body W, a retreat position P2 of retreating toward the first fixed arm 22 against the spring 4 can be set. At the position P2, the outer surface 314 of the engaging arm 31 approaches the inner surface 211 of the first fixed arm 21.
[0068]
When the handle portion 1 is further turned in the same direction, the first engagement arm portion 31 is pushed by the spring 4 as shown in FIG. The engaging arm 31 is moved in a direction in which the concave step 225 of the arm 22 and the two concave steps 318, 318 of the first engaging arm 31 and the concave step 325a of the second engaging arm 32 engage. , 32 move.
[0069]
With the concave steps 318, 325a of the engaging arms 31, 32 engaged with the corners C of the rotating body, the handle portion 1 is moved relative to the rotating body W as shown in FIG. 2 By turning to the fixed arm portion 22 side, the entirety of the engagement arm portions 31, 32 is in contact with the inner surfaces 211, 221 of the fixed arm portions 21, 22 and slides relative to the rotation direction of the handle portion 1. The outer surface 315 of the end portion 311 of the arm portion 31 in the rotatable connection portion 30 of the engaging arm portions 31 and 32 is assisted by the spring 4 while slightly rotating in the opposite direction, and the back side of the first fixed arm portion 21. It contacts the inner surface 212. Further, by rotating the handle portion 1 in the same direction, the fixed fork portion 2 and the variable opening degree fork portion 3 rotate together with the handle portion 1 while the engagement arm portions 31 and 32 remain engaged with the rotating body W. The rotated object W can be rotated, and when the rotated object is a bolt head or a nut, it can be tightened or loosened.
[0070]
FIG. 6 shows that after rotating the rotating body W by a certain angle in the state shown in FIG. 5 (D), the handle portion 1 is again turned to the first fixed arm portion 21 side, and then to the second fixed arm portion 22 side. The rotation of the rotating body W is engaged with the concave step portions 33, 226, and 317a, and the rotating body W is rotated.
[0071]
As described above, in the state where the first engagement arm portion 31 can take the retreat position P1 or the engagement position P2, the first engagement arm 31 is rotated along with the turning operation of the handle portion 1 toward the first fixed arm portion 21 side. The joint arm portion 31 can reciprocate repeatedly between the engagement position P1 and the retreat position P2. Therefore, the handle portion 1 is rotated by an arbitrary angle toward the second fixed arm portion 21 so that the engagement arm portions 31, 32 and The concave steps 317a, 33 and 226 or 318, 325a, and 225 of the second fixed arm 22 can be engaged with the corner C of the rotating body W.
[0072]
This spanner SP can be manufactured in a simple structure with a small number of parts, and can be manufactured at a low cost.
[0073]
Since the wrench SP holds or tightens half or more of the corners of the rotated body, the corners C of the rotated body W are less likely to be damaged.
[0074]
The spanner SP can be easily operated with one hand, and is easy to use.
[0075]
【The invention's effect】
As described above, according to the present invention, a rotating body such as a bolt head and a nut having a polygonal cross-section can be fitted and engaged from the side, and the rotating body can be reciprocally rotated in the engaged state. Can be provided with a convenient spanner that can tighten or loosen the wrench.
[0076]
Further, according to the present invention, it is possible to provide a spanner that can be manufactured in a simple structure with a small number of parts and can be manufactured at a low cost.
[0077]
According to the present invention, it is possible to provide a spanner that is less likely to damage the rotating body.
[0078]
Further, according to the present invention, an easy-to-use spanner can be provided.
[Brief description of the drawings]
FIG. 1 is an overall plan view of an example of a spanner according to the present invention.
FIG. 2 is a bottom view of the spanner shown in FIG.
FIG. 3 is a plan view of the wrench shown in FIG. 1 with an upper lid removed.
FIG. 4 is an enlarged plan view of a main part in a state where an upper lid of the spanner shown in FIG. 1 is removed.
FIG. 5 is a view showing steps from fitting engagement of the spanner shown in FIG. 1 to a rotated body to start a turning operation.
FIG. 6 is a view showing a process of rotating the handle toward the first fixed arm and then rotating the handle toward the second fixed arm from the state shown in FIG. .
[Explanation of symbols]
SP spanner
1 Handle
2 fixed fork
201 Upper lid
202 Lower lid
3 Variable opening bifurcation
4 Spring
21 First fixed arm
22 Second fixed arm
210, 220 Free end of fixed arm
211, 221 Inner surface of fixed arm
212, 222 Inner surface inside fixed arm
S1 opening
S2 Intermediate space
S3 interior space
W Rotated body
C Rotated body corner
31 First engagement arm
32 Second engagement arm
311, 321 End of engagement arm
312, 322 Free end of arm for engagement
313, 323 Intermediate part of the arm for engagement
314, 324 Outer surface of engagement arm
315 outer surface of engagement arm end 311 on first fixed arm side
316 Projection of engagement arm end 311
316a Projection outer surface
30 Rotatable connecting part of the arm for engagement
311a Cylindrical hole at end 311 of engaging arm
311b Notch connected to cylindrical hole 311a
317, 325 Inner surface of arm for engagement
317a, 318, 33, 225, 226, 325a recessed step
317b, 325b Yamabe
211a, 221a Concave curved surface of free end of fixed arm
314a, 324b Convex curved surface of curvature of free end of arm for engagement

Claims (10)

Handle part,
A fixed bifurcated portion connected to at least one end of the handle portion,
With a variable opening degree bifurcation arranged in the fixed bifurcation,
The fixed bifurcated portion includes first and second fixed arm portions facing each other, and between the fixed arm portions, a rotating body such as a bolt head or a nut having a polygonal cross section is fitted from the side thereof. It has an opening between the free ends of the detachable fixed arms and a space continuous with the opening,
The variable opening bifurcated portion includes first and second engagement arm portions disposed between the first and second fixed arm portions for externally engaging the rotating body from the side thereof. Yes,
One ends of the first and second engagement arms are rotatably connected to each other in a space between the fixed arms, and a separated free end faces an opening between the fixed arms. The opening degree is variable with the rotatable connecting portion as a center portion,
At least one of the first and second engagement arm portions has a concave step on an inner surface that is detachable from a corner of the rotated body,
The first and second engaging arm portions are configured such that their rotatable connection portions can reciprocate between the first and second fixed arm portions, and the entirety of the first and second engaging arm portions is relative to the first and second fixed arm portions. Pivotable,
The rotatable connecting portion is provided with a biasing force by a spring in a direction in which it contacts the first fixed arm portion,
The handle is first fixed to the object to be rotated about the object to be rotated in a state where the object to be rotated is fitted between the first and second engaging arms of the variable opening degree forked part from the opening of the fixed forked part. The first and second engagement arms are rotated relative to the arm so that the first and second engagement arms can rotate so that the rotatable connection of the first and second engagement arms approaches the second fixed arm. The entirety of the engaging arm portion is slightly rotated relative to the first and second fixed arm portions in a direction relatively opposite to the direction of rotation of the handle portion toward the first fixed arm portion, and is in the same direction as the handle portion. With further rotation of the arm, the first engagement arm portion is set to the position where it is retracted toward the first fixed arm portion side so that the peak portion adjacent to the concave step portion can get over the corner portion of the rotating body. Then, the concave step of the first and / or second engaging arm is returned to the corner of the rotating body by the elastic restoring force of the spring again. It is possible to take a position that allows Rukoto,
In the state where the concave step in the first and / or second engagement arm is engaged with the corner of the rotating body, the handle is rotated toward the second fixed arm relative to the rotating body. The first and second engaging arms are rotatably connected to the first fixed arm with the help of a spring, and the first and second engaging arms are engaged with the rotating body. A spanner wherein the fixed fork and the variable opening degree fork can rotate together with the handle to rotate the rotating body. Each of the first and second engagement arms has a concave step on the inner surface that is detachable from a corner of the rotated body,
The second fixed arm also has the concave step on the inner surface,
The first and second engaging arm portions have an inter-meeting portion on the inner surface thereof, and the inner surface of the second fixed arm portion and the inter-meeting portion of the inner surface of the second engaging arm portion also form the concave step.
2. The spanner according to claim 1, wherein each of the recessed steps is disposed at a position where at least every other concave step engages with a corner of the rotated body and can hold the rotated body. The inner surfaces of both engaging arms from the free end of the first engaging arm to the free end of the second engaging arm are formed in a concave curved surface, and are covered with the concave curved inner surface. The wrench according to claim 1 or 2, wherein the concave step portion is formed in a plurality of steps at a corner of the rotating body. The space between the first and second fixed arms includes an intermediate space continuous with the opening between the free ends of the fixed arms and a back space continuous with the intermediate space. The spanner according to claim 1, 2 or 3, wherein the first and second engaging arms have one ends connected rotatably to each other in the deep space and extend to the intermediate space. . The first fixed arm portion has at least a part of an outer surface of a portion extending from a free end portion to an intermediate portion of the first engaging arm portion in an arc shape, and has an inner surface slidably contactable with the first and second engagement arms. A back inner surface for contacting and supporting the rotatable connection portion of the second engagement arm portion;
The second fixed arm portion has an inner surface on which at least a part of an outer surface of a portion from the free end portion to the intermediate portion of the second engaging arm portion can draw contact with an arc so as to be able to contact and slide. The spanner according to any one of claims 1 to 4, further comprising a rear inner surface for supporting the rotatable connection portion of the second engagement arm portion via the spring. The outer surface of the portion from the free end to the intermediate portion of the first engaging arm is formed as a convex curved surface, and the first fixed arm is at least a part of the outer surface of the convex curved surface of the first engaging arm. Has an inner surface of a concave curved surface capable of contact sliding and the inner surface of the back side,
The outer surface of a portion from the free end to the intermediate portion of the second engaging arm portion is formed as a convex curved surface, and the second fixed arm portion is at least a part of the outer surface of the convex curved surface of the second engaging arm portion. 6. The wrench according to claim 5, wherein the wrench has an inner surface of a concave curved surface slidable and a back inner surface. One end of one of the first and second engaging arms is rotatably fitted to one of the ends of the other engaging arm so that the first and second engaging arms are rotatable. The spanner according to any one of claims 1 to 6, wherein ends of the engagement arm portions are rotatably connected to each other. One end of the second engaging arm is rotatably fitted to one end of the first engaging arm so that the ends of the first and second engaging arms can be rotated. The wrench according to claim 7, wherein the wrench is connected to the wrench. The rotatable connecting portion of the first and second engaging arms includes a protruding portion protruding farther between the fixed arms, and the protruding portion constitutes the rotatable connecting portion. The spring is mounted between the projecting portion and the second fixed arm portion, and is formed at the end of one of the engaging arm portions of the two engaging arm portions. The spanner according to any one of claims 1 to 8, wherein the connecting portion can abut on the first fixed arm portion at a portion of the one engagement arm portion facing the first fixed arm portion. The rotatable connecting portion of the first and second engaging arms includes a protruding portion protruding farther between the fixed arms, and the protruding portion constitutes the rotatable connecting portion. One end of the engaging arm portion of the two end portions of the engaging arm portion is formed at the end of the other engaging arm portion that is rotatably fitted and externally fitted to the end portion, The spring is mounted between the protruding portion and the second fixed arm portion, and the rotatable connecting portion is a first fixed arm at an end of the other engaging arm portion having the protruding portion. The spanner according to claim 7, 8 or 9, wherein a portion directed to the portion can abut on the first fixed arm portion.

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