JP3039158U - Open-end spanner - Google Patents

Abstract

(57) [Abstract] [Problem] An open end wrench having a high clamping force and not damaging the corners of a hexagonal fastening member. An open end wrench having a handle and at least one open end that includes two jaws, a throat in which the two jaws are placed in parallel and a hexagonal fastening screw component is placed therebetween. A hole is formed, and a driving arc surface that forms an inclination angle of 4 to 8 degrees with the inner surface is formed at a position corresponding to the root of the jaw on the inner surface of the jaw, and the length of the driving arc surface is hexagonal. One third of the length of one side of the fastening screw part is formed, and a semi-pear-shaped hole is formed adjacent to the driving arc surface near the throat, and an end of the semi-pear-shaped hole toward the inner side is formed. An arc-shaped bearing surface is formed on the portion, and a stop portion is formed on the outer end of the semi-pear-shaped hole.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a kind of open-end wrench, and more particularly to a drive arc surface and a semi-pear-shaped hole provided on the inner surface of the jaw, which is combined with the corners and side surfaces of a hexagonal fastening member to exhibit good driving characteristics. .

[0002]

[Prior art]

 A typical open end wrench comprises a head having an opening at one or both ends of a single handle. The head comprises two jaws, which jaws have a light-smooth plane that abuts opposite sides of a polygonal fastening screw part, such as a bolt or nut.

Conventional open-end spanners are such that the light-slip planes of their two jaws theoretically maintain good planar contact with the contact surfaces of the fastening screw parts. However, in practice, it is provided slightly larger than the distance between the two parallel sides of the fastening screw part so that the fastening screw part can slide smoothly between the two jaws. For this reason, a gap is formed between the smooth surface of the jaw of the open end spanner and the side surface of the fastening screw part. When a torque is applied to the fastening screw part with the open end wrench, the gap forms an inclination between the fastening screw part and the light-slipping plane, and the light-slip plane of the spanner is slightly angled with the fastening screw part. It is only possible to make contact with, and not to make face-to-face contact. This phenomenon made it easier for the spanner to slip off the fastening screw part, and the jaws of the spanner could be deformed more easily, and the corners of the fastening screw part were easily worn or broken.

[0004]

[Problems to be solved by the device]

 The present invention relates to an open-end wrench having one handle and at least one open end including two jaws, and a throat in which the two jaws are installed in parallel and a hexagonal fastening screw part is placed therebetween. A hole is formed, and a driving arc surface that forms an inclination angle of 4 to 8 degrees with the inner surface is formed at a position corresponding to the root of the jaw on the inner surface of the jaw, and the length of the driving arc surface is 6 One-third the length of one side of the rectangular fastening screw part, and a semi-pear-shaped hole is formed adjacent to the driving arc surface near the throat. An arc-shaped bearing surface is formed at the end of the hole, and a stop is formed at the end of the semi-pear-shaped hole that is closer to the outer side. With the above configuration, the hexagonal fastening member applies torque within the throat. When receiving, one side of it automatically abuts on the driving arc surface of one jaw, which causes the open end spa The hexagonal fastening member is fastened to the hexagonal fastening member with a large area contact method by its driving arc surface and the bearing surface to have a high clamping force with respect to the hexagonal fastening member, and one corner of the hexagonal fastening member is An object is to prevent the hexagonal fastening member from slipping when it is held in the semi-pear-shaped hole and torque is added.

[0005]

[Means for Solving the Problems]

 The invention of claim 1 comprises one handle and an open end provided at at least one end of the handle, the open end having two jaws between which a throat hole into which a hexagonal fastening member is placed is formed. An open end wrench having two inner surfaces each having one inner surface, the two inner surfaces being arranged substantially parallel to each other, the inner surface being formed at a root position of the inner surface. One driving arc surface that has one inclination angle with the inner surface and is slanted inward toward the inside to extend the length of one side of the hexagonal fastening member, and the arc shape of the inner end And a semi-pear-shaped hole formed with an outer end stop.

According to the second aspect of the invention, the inclination angle of the driving arc surface is set to about 4 to 8 degrees.

According to the third aspect of the present invention, the extension distance on the inner surface of the driving arc surface is about one third of the length of one side of the hexagonal fastening member.

In the invention of claim 4, the drive circular arc surface is designed in a tooth shape.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The open-end wrench of the present invention comprises a handle and at least one open end, which has two jaws between which a hexagonal fastening member, for example, a hexagon nut. Can be put away. The two jaws are formed so that their inner surfaces are parallel to each other. The inner surface of each jaw is provided with one drive arc and one semi-pear hole. The driving arc surface is formed at the root of the inner surface, forms one inclination angle α with the inner surface, and extends a distance of about one third of one side of the hexagonal fastening member. ing. The inner end of the semi-pear-shaped hole is an arc-shaped bearing surface that touches one side of the hexagonal fastening member, and the diagonal of the hexagonal fastening member can be easily driven by another jaw. It is supposed to enter the position of the moving arc surface. Stops are provided on the outer edges of the semi-pear holes to prevent the hexagonal fastening members from sliding out.

[0010]

【Example】

 FIG. 1 shows an open end wrench 1 of the present invention, which has a handle 2 and at least one open end 3 formed at one end of the handle 2. The open end 3 has two jaws 4, 5 (see FIG. 2). One throat 6 is formed between the jaws 4 and 5, and one hexagonal fastening member 7 is placed therein (see FIG. 2). The jaws 4, 5 have inner surfaces 41, 51 which are substantially parallel to each other. Driving arc surfaces 42 and 52 are formed at the roots of the inner surfaces 41 and 51. The driving arc surfaces 42 and 52 are recessed inward so as to form an inclination angle α of 4 to 8 degrees with the inner surface surfaces 41 and 51, and the length L of one side of the hexagonal fastening member to be combined (see FIG. (Refer to 2) is stretched about one third.

As shown in FIGS. 1 and 2, the inner surfaces 41, 51 of the jaws 4, 5 each have one semi-pear shaped hole 43, 53. The semi-pear-shaped holes 43 and 53 have arcuate support portions 431 and 531 formed at the inner ends thereof, and stopper portions 432 and 532 are formed at the outer end portions thereof.

As shown in FIG. 2, the hexagonal fastening member is placed in the throat 6 of the open end wrench 1 of the present invention, and the handle 2 is turned. To occur. As shown in FIGS. 1, 2, 3, and 4, the support portions 431 and 531 of the semi-pear holes 43 and 53 are formed in an arc shape, and when the operator turns the handle 2, the corners of the hexagonal fastening member are angled. The other corner b and the side b ′ of the hexagonal fastening member 7 which are supported on the inner side of a and are located on the diagonal line of the corner are simply and automatically positioned on the driving arc surface 52. As a result, the driving arc surface 52 comes into contact with one side b'of the hexagonal fastening member 7. When the torque is applied to the hexagonal fastening member 7, the corner a of the hexagonal fastening member 7 enters into the semi-pear-shaped hole 43. At this time, when the spanner is pulled in the direction of the arrow R, the position of the stopper portion 432 of the semi-pear-shaped hole 43 is higher than the corner a of the hexagonal fastening member 7, so that the corner a of the hexagonal fastening member 7 is located. It shall be in contact and held in the semi-pear shaped hole 43 to prevent the open end wrench 1 from unintentionally disengaging from the hexagonal fastening member 7.

As shown in FIGS. 1, 2, and 3, the length of the driving arc surface 52 is approximately one third of the length L (see FIG. 2) of one side of the hexagonal fastening member. And the support portion 431 of the semi-pear-shaped hole 43 automatically abuts the side b'of the hexagonal fastening member 7 on the driving arc surface 52, and the driving arc surface 52 makes contact with a large area. In this way, a pressure is applied to the hexagonal fastening member 7 to generate a torque. The supporting portion 431 has an arc shape with a large bending ratio radius, and supports the inner side of the corner a of the hexagonal fastening member 7, but does not support the corner. When the torque is applied to the hexagonal fastening member, the bearing portion applies pressure to the side a'of the hexagonal fastening member 7 in a large area of an arc having a large bending rate radius, and the driving arc surface 5 2 Also applies pressure to the side b'of the hexagonal fastening member 7 in a large area contact mode. This prevents breakage or wear of the corners of the hexagonal fastening member, and prevents the corners of the hexagonal fastening member 7 from being damaged by the torque when the spanner is rotated. be able to.

The effect of rotating the chamfered hexagonal fastening member 7 with the open end wrench of the present invention reaches three items as shown in FIGS. That is, the corners of the hexagonal fastening member should not be damaged, those that the spanner cannot fix can be turned, and those that were damaged by other tools can also be turned. Further, by making the open ends of both ends of the wrench of the present invention different in shape as shown in FIG. 7, it becomes more practical. Further, as shown in FIGS. 8 to 12, the same effects as those of the above-described embodiment can be achieved even if the jaws 4 and 5 are combined with teeth, arcs, or semi-pear holes.

[0015]

[Effect of the invention]

 The open end wrench of the present invention automatically causes one side of the hexagonal fastening member to move to one side when torque is applied to the hexagonal fastening member placed in the throat provided between the two jaws at the open end. The hexagonal fastening members are brought into contact with each other on the driving arc surface of one jaw, so that the driving arc surface and the bearing surface provided on the inner surface of the jaws tighten the hexagonal fastening member with a large area contact method, and the hexagonal fastening member is securely attached to the hexagonal fastening member. In addition to achieving the clamping, one corner of the hexagonal fastening member can be held in the semi-pear shaped hole described above so that the hexagonal fastening member does not slip out when torque is applied, and the corner of the hexagonal fastening member Can be turned without damaging.

[Brief description of the drawings]

FIG. 1 is a side view of an open end wrench of the present invention.

FIG. 2 is a side view showing a state in which the open end wrench of the present invention applies torque to a hexagon nut.

FIG. 3 is an enlarged side view showing a state in which the driving arc surface of the inner surface of the jaw of the open end wrench of the present invention and the sides of the hexagonal fastening member are combined.

FIG. 4 is a side view showing a state where torque is applied to the chamfered hexagon nut of the open end wrench of the present invention.

FIG. 5 is an enlarged display view in side view of a combination of the driving arc surface of the inner surface of the open end wrench of the present invention and the side surface of the chamfered hexagonal fastening member.

FIG. 6 is a view showing a use operation of the open end wrench of the present invention in a side view.

FIG. 7 is a perspective view showing an embodiment of the present invention in which both jaws have different shapes.

FIG. 8 is a side view showing another preferred embodiment of the present invention.

FIG. 9 is a side view showing another preferred embodiment of the present invention.

FIG. 10 is a side view showing another preferred embodiment of the present invention.

FIG. 11 is a side view showing another preferred embodiment of the present invention.

FIG. 12 is a side view showing another preferred embodiment of the present invention.

[Explanation of symbols]

1 ... Open end wrench 2 ... Handle 3.
..Open ends 4, 5 ... Jaw 6 ... Throat 7 ... Hexagonal fastening member 41, 51 ... Inner surface 42, 52 ... Driving arc surface 43, 53 ... Half Pear-shaped holes 431, 531 ... Support portion 432, 532 ... Stop portion

Claims (4)

[Utility model registration claims] 1. A handle and an open end provided on at least one end of the handle, the open end having two jaws between which a throat is formed for receiving a hexagonal fastening member. An open end wrench, wherein each of the two jaws has an inner surface, and the two inner surfaces are arranged substantially parallel to each other, the inner surface being formed at a root position of the inner surface. And one driving arc surface that is inclined inwardly at one inclination angle and extends the length of one side of the hexagonal fastening member, and an arc-shaped bearing portion at the inner end. An open-end wrench, comprising: a semi-pear-shaped hole in which a stop portion of an outer end is formed. 2. The inclination angle of the driving arc surface is about 4 to 8
The open end wrench of claim 1, wherein the open end wrench is in degrees. 3. The open end wrench according to claim 1, wherein the extension distance on the inner surface of the driving arc surface is about one third of the length of one side of the hexagonal fastening member. 4. The open end wrench according to claim 1, wherein the driving arc surface is designed in a tooth shape.