JP4158372B2 - Electric tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power tool for detachably attaching a socket to an output shaft of a power tool body.
[0002]
[Prior art]
Conventionally, as shown in FIG. 8, a socket 1 is formed so as to be detachable with respect to an output shaft 3 of an electric power tool body 2, and a plurality of types of screws 1 and the like are appropriately replaced as necessary. Electric tools that can deal with the above-mentioned fixing tools are widely used.
[0003]
As shown in FIG. 9, the electric power tool has an output shaft 3 of the electric power tool body 2 fitted in the output shaft insertion recess 11 of the socket 1, and the output shaft 3 is perforated in a direction perpendicular to the axial direction. The holes 31 and the through holes 12 'drilled in the both side walls of the output shaft fitting recess 11 of the socket 1 are communicated, and the pins 32 are inserted into these holes. A rubber ring 33 is fitted on the outer periphery of the through hole 12 ′ of the socket 1 to prevent the inserted pin 32 from coming off (the socket mounting method is “pin method”). In addition, 10 in a figure shows the recess into which a fixing tool is inserted.
[0004]
In such a power tool, in order to mount the socket 1, the output shaft 3 is inserted into the output shaft insertion recess 11 of the socket 1 so that the through hole 12 ′ of the socket and the through hole 31 of the output shaft 3 communicate with each other. Since the pin 32 is inserted and the rubber ring 33 is fitted on the outer periphery of the through hole 12 ′ of the socket 1, this operation is complicated and time-consuming. Thus, an electric tool has been invented in which the operation of attaching the socket 1 to the output shaft 3 is simple and does not take time.
[0005]
As shown in FIG. 10, the bottomed hole 4 is formed in the side surface of the output shaft 3 in the direction perpendicular to the axial direction, and the coil spring 5 ′ is disposed on the bottom 41 of the bottomed hole 4. The pressing body 6 is disposed on the opening 42 side of the coil spring 5 ′ of the bottomed hole 4 in which the coil spring 5 ′ is disposed, and the pressing body 6 is spring-biased to the edge of the opening 42 of the bottomed hole 4 by the coil spring 5 ′. (Socket mounting method is “ball joint method”). As shown in FIG. 10D, the bottomed hole 4 may be formed by closing one opening of the through hole 31 formed in the output shaft 3 shown in FIG.
[0006]
When the pressing body 6 is disposed in the bottomed hole 4, a spherical surface portion 61 that forms a part of a spherical surface is formed on the surface facing the outside of the opening 42 of the bottomed hole 4. The edge of the opening 42 of the bottomed hole 4 is formed to have a smaller diameter than the outer diameter of the spherical surface portion 61, so that the pressing body 6 does not fall out of the bottomed hole 4. Then, by interposing a coil spring 5 ′ between the bottom 41 of the bottomed hole 4 and the pressing body 6, the pressing body 6 is spring-biased toward the edge of the opening 42 of the bottomed hole 4. In the pressing body 6 spring-biased at the edge of the opening 42, the central portion 61 a of the spherical surface portion 61 is positioned outside the edge of the opening 42, but the central portion 61 a resists the spring force and the inside of the bottomed hole 4. When pushed in the direction, it is housed in the bottomed hole 4.
[0007]
In order to attach the socket 1 to the output shaft 3, the output shaft 3 is inserted into the output shaft insertion recess 11 of the socket 1 (see FIG. 10A), and the opening edge of the output shaft insertion recess 11 of the socket 1 is inserted. The top portion 61a of the pressing body 6 positioned outside the opening 42 of the bottomed hole 4 of the output shaft 3 is pushed down (see FIG. 10B), and the output shaft 3 is inserted into the output shaft insertion recess 11 of the socket 1. When fully inserted, the bottomed hole 4 of the output shaft 3 and the recessed portion 12 of the socket 1 communicate with each other and the central portion 61 a that has been pushed down is raised and fitted into the recessed portion 12, so that the socket 1 is attached to the output shaft 3. It is locked (see FIG. 10C).
[0008]
In order to remove the socket 1 from the output shaft 3, a force is applied in a direction in which the socket 1 and the output shaft 3 are separated from each other, and the central portion 61 a of the pressing body 6 fitted into the recess 12 at the edge of the recess 12 of the socket 1. The output shaft 3 can be pulled out from the socket 1 by pushing down.
[0009]
However, in the electric tool provided with the socket 1 and the output shaft 3, since the coil spring 5 ′ is interposed in the bottomed hole 4, the pressing body 6 is bottomed against the spring force. When the coil spring 5 ′ expands and contracts by being pushed into the hole 4 or releasing the force pushing the pressing body 6, the coil spring 5 ′ and the inner side surface 43 of the bottomed hole 4 of the socket 1 are slid and coiled. There is a problem that the spring 5 ′ is worn and damaged, and the pressing body 6 cannot be pressed against the opening 42 of the bottomed hole 4.
[0010]
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and an object of the present invention is to wear the elastic body arranged in the bottomed hole of the output shaft of the power tool body by sliding with the inner side surface of the bottomed hole. It is an object of the present invention to provide an electric tool that does not end up.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, an electric tool according to the present invention is a power tool in which a socket 1 is detachably attached to an output shaft 3 of an electric tool body 2 and has a bottom in a direction perpendicular to the axial direction on the side surface of the output shaft 3. A hole 4 is drilled to the bottom 41 of the bottomed hole 4.The gap 8 is formed between the bottomed hole 4 and the inner side surface 43 of the bottomed hole 4 when the bottomed hole 4 is arranged in the bottomed hole 4.A stretchable elastic body 5 made of rubber is disposed, and a pressing body 6 in which a spherical surface portion 61 is formed on the surface facing the outside of the opening 42 is disposed on the opening 42 side of the bottomed hole 4. A retaining opening edge 42 a having an inner diameter smaller than the outer diameter of the spherical surface portion 61 of the pressing body 6 that prevents the bottomed hole 4 from falling off is formed at the opening 42 edge of the bottomed hole 4, and the pressing body 6 is formed by the elastic body 5. Is pressed against the retaining opening edge 42a so that the central portion 61a of the spherical surface portion 61 is located outside the opening 42 of the bottomed hole 4, and the central portion 61a is the inner surface of the output shaft fitting recess 11 of the socket 1. It is characterized by being fitted into the recess 12 formed in the above. With this configuration, the elastic body 5 disposed on the bottom 41 of the bottomed hole 4 of the output shaft 3 is formed of rubber, so that the elastic body 5 and the inner side surface 43 of the bottomed hole 4 slide. However, the elastic body 5 can be prevented from being worn, and the elastic body 5 can be prevented from being damaged and the performance being deteriorated.At this time, it is possible to further suppress the elastic body 5 from being slid and worn on the inner side surface 43 of the bottomed hole 4.
[0013]
Also,In order to solve the above problems, an electric tool according to the present invention is a power tool in which a socket 1 is detachably attached to an output shaft 3 of an electric tool body 2 and has a bottom in a direction perpendicular to the axial direction on the side surface of the output shaft 3. The hole 4 is drilled, and the bottom 41 of the bottomed hole 4 isDiameter d at the center of the bottomed hole 4 direction₁Is the diameter d of both ends in the direction.₂Smaller thanA stretchable elastic body 5 made of rubber is disposed, and a pressing body 6 in which a spherical surface portion 61 is formed on the surface facing the outside of the opening 42 is disposed on the opening 42 side of the bottomed hole 4. A retaining opening edge 42 a having an inner diameter smaller than the outer diameter of the spherical surface portion 61 of the pressing body 6 that prevents the bottomed hole 4 from falling off is formed at the opening 42 edge of the bottomed hole 4, and the pressing body 6 is formed by the elastic body 5. Is pressed against the retaining opening edge 42a so that the central portion 61a of the spherical surface portion 61 is located outside the opening 42 of the bottomed hole 4, and the central portion 61a is the inner surface of the output shaft fitting recess 11 of the socket 1. It is characterized by being fitted into the recess 12 formed in the above. With this configuration, the elastic body 5 disposed on the bottom 41 of the bottomed hole 4 of the output shaft 3 is formed of rubber, so that the elastic body 5 and the inner side surface 43 of the bottomed hole 4 slide. However, the elastic body 5 can be prevented from being worn, and the elastic body 5 can be prevented from being damaged and the performance being deteriorated.A gap 8 can be formed between the center portion of the elastic body 5 and the inner side surface 43 of the bottomed hole 4, and the elastic body 5 can be prevented from being slid and worn by the inner side surface 43 of the bottomed hole 4. However, the diameter d of both ends of the elastic body 5₂Is substantially the same as or slightly smaller than the middle part of the bottomed hole 4, so that the elastic body 5 is arranged with good stability without being twisted by the bottomed hole 4 due to a fall or the like in the bottomed hole 4. Is possible.
[0016]
Moreover, it is preferable to drill the through-hole 51 in the elastic body 5 in the direction of the bottomed hole 4. With such a configuration, the compressive deformation of the elastic body 5 can be dispersed not only in the outer direction but also in the inner direction, and the elastic body 5 is caused by a fall in the bottomed hole 4 or the like. Can be arranged with good stability without being twisted by the bottomed hole 4.
[0017]
Moreover, the electric tool according to the present invention is a power tool in which the socket 1 is detachably attached to the output shaft 3 of the electric tool body 2 and the bottomed hole 4 is formed in the side surface of the output shaft 3 in a direction perpendicular to the axial direction. Then, a pair of repelling bodies 7a and 7b made of magnets repelling each other by repulsive force are arranged on the bottom 41 of the bottomed hole 4, and the bottomed hole 4 has a surface facing the outside of the opening 42 on the opening 42 side. The pressing body 6 in which the spherical surface portion 61 is formed is disposed, and has a retaining opening edge 42a having an inner diameter smaller than the outer diameter of the spherical surface portion 61 of the pressing body 6 that prevents the pressing body 6 from falling off the bottomed hole 4. Formed at the edge of the opening 42 of the bottom hole 4, and by pressing the pressing body 6 against the retaining opening edge 42 a by the repelling body 7, the central portion 61 a of the spherical surface portion 61 is positioned outside the opening 42 of the bottomed hole 4, The central portion 61 a is a recess 12 formed on the inner surface of the output shaft insertion recess 11 of the socket 1. It is characterized in that fitted. By adopting such a configuration, the repelling bodies 7a and 7b for repressing the pressing body 6 against the retaining opening edge 42a of the bottomed hole 4 can be used semipermanently.
[0018]
In addition, it is preferable that one of the opposing surfaces of the pair of repelling bodies 7 a and 7 b is a concave surface 71 and the other is a convex surface 72. By setting it as such a structure, the area which the repulsion bodies 7a and 7b oppose can increase, and a repulsive force can be raised, and it becomes possible to miniaturize the repulsive bodies 7a and 7b which produce a predetermined repulsive force. .
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.
[0020]
The power tool in the present embodiment is composed mainly of a power tool main body from which the output shaft protrudes and a socket that is detachably attached to the output shaft, and a plurality of types of sockets are appropriately replaced as necessary. It can correspond to a fastener such as a screw. FIG. 8 shows an overall view of the power tool.
[0021]
As shown in FIG. 8, the electric power tool main body 2 includes a casing portion 21 having a generally cylindrical shape and a handle portion 22 formed integrally with the casing portion 21 to form an outer shell. In the casing portion 21, devices such as a power source portion, a control portion, and a drive portion such as a motor for driving the output shaft 3 to be described later are housed, although not shown in particular, and the handle portion 22 energizes the devices. A switch for turning on / off electricity is provided. In such a power tool main body 2, the output shaft 3 connected to the drive unit protrudes from the tip of the casing unit 21.
[0022]
As shown in FIG. 1, the output shaft 3 is formed in a substantially circular cross section, a socket 1 is attached, and a fixing tool (not shown) is fitted into the socket 1, and the driving force from the drive unit is applied to the socket 1. It transmits to a fixing tool via. Each socket 1 is provided with a fitting fitting hole (not shown) corresponding to various fixing tools such as screws and nails on the front end side, and an output shaft fitting to be fitted on the output shaft 3 on the rear end side. A recess 11 is drilled. The power tool is not particularly limited, such as a tool that transmits a rotational force to the output shaft 3 or a tool that applies an axial force (for example, an impact force) to the output shaft 3.
[0023]
Below, attachment to the output shaft 3 of the socket 1 is demonstrated.
[0024]
The output shaft 3 has a bottomed hole 4 formed in a side surface in a direction perpendicular to the direction of the output shaft 3. The bottomed hole 4 has a cylindrical inner side surface shape having a substantially circular cross section perpendicular to the drilling direction. As will be described later, the opening 42 edge of the bottomed hole 4 is formed with a retaining opening edge 42a whose diameter is narrower than that of the cylindrical inner side surface portion in the middle of the bottomed hole 4. On the bottom 41 of the bottomed hole 4 as described above, an elastic body 5a that can be expanded and contracted is disposed.
[0025]
The elastic body 5a is elastic and made of rubber, and is formed in a cylindrical shape having a diameter that is substantially the same as or slightly smaller than the diameter of the middle portion of the bottomed hole 4, and has a length (that is, a cylindrical shape). The length in the height direction is approximately half the depth of the bottomed hole 4 (that is, the length in the drilling direction). The elastic body 5a is disposed at the bottom 41 of the bottomed hole 4, and the pressing body 6 is disposed closer to the opening 42 than the elastic body 5a of the bottomed hole 4.
[0026]
The pressing body 6 has a substantially spherical shape having a diameter substantially the same as or slightly smaller than the diameter of the middle portion of the bottomed hole 4. The pressing body 6 is mainly formed of metal or the like, and when disposed in the bottomed hole 4, a spherical surface portion 61 is formed on a surface facing the outside of the opening 42 of the bottomed hole 4. The pressing body 6 is disposed on the opening 42 side of the bottomed hole 4. At this time, the pressing body 6 is prevented from falling off the bottomed hole 4, so that the edge of the opening 42 of the bottomed hole 4 is blocked. Is formed with a retaining opening edge 42a as described above. The retaining opening edge 42 a is formed by constricting the opening 42 edge of the bottomed hole 4 so as to have an inner diameter smaller than that of the cylindrical inner side surface in the middle of the bottomed hole 4. Further, as the retaining opening edge 42a, a ring-shaped member attached to the opening 42 of the bottomed hole 4 may be used. Thereby, it is possible to prevent the pressing body 6 from dropping from the bottomed hole 4.
[0027]
When such an elastic body 5 a and the pressing body 6 are arranged in the bottomed hole 4, the pressing body 6 is elastically pressed against the retaining opening edge 42 a of the bottomed hole 4 by the elastic body 5 a arranged in the bottom 41. The By doing in this way, the outward force 42 of the bottomed hole 4 is always applied to the pressing body 6 by the elastic force of the elastic body 5a, and the pressing body 6 is initially pressed by the retaining opening edge 42a. The central portion 61 a of the spherical surface portion 61 is in a state located outside the opening 42 of the bottomed hole 4. Further, as shown in FIG. 1B, when the central portion 61a of the spherical surface portion 61 of the pressing body 6 is pushed inward of the bottomed hole 4 against the elastic force of the elastic body 5a, the elastic body 5a is The center portion 61a is shrunk so that it does not protrude outward from the opening 42 of the bottomed hole 4.
[0028]
Next, the socket 1 will be described. The output shaft insertion recess 11 drilled on the rear end side of the socket 1 is drilled so as to have an inner shape along the outer shape of the output shaft 3 so that the output shaft 3 is inserted. And the recessed part 12 in which the top center part 61a of the said press body 6 is engage | inserted is formed in the inner surface of the output shaft insertion recessed part 11 of the socket 1. As shown in FIG. In the present embodiment, the recess 12 is formed as a hole penetrating the side wall of the output shaft fitting recess 11 of the socket 1. The recess 12 is formed so that the bottomed hole 4 of the output shaft 3 and the recess 12 communicate with each other when the output shaft 3 is fitted in the output shaft insertion recess 11 of the socket 1.
[0029]
In order to attach the socket 1 to the output shaft 3, the output shaft 3 is inserted into the output shaft insertion recess 11 of the socket 1, and the bottomed hole 4 of the output shaft 3 is formed at the opening edge of the output shaft insertion recess 11 of the socket 1. If the central part 61a of the pressing body 6 located outside the opening 42 is pushed down and the output shaft 3 is completely inserted into the output shaft insertion recess 11 of the socket 1, the bottomed hole 4 of the output shaft 3 and the socket The central portion 61 a that has been pushed down by communicating with the first concave portion 12 rises and fits into the concave portion 12, and the socket 1 is locked to the output shaft 3.
[0030]
In order to remove the socket 1 from the output shaft 3, a force is applied in a direction in which the socket 1 and the output shaft 3 are separated from each other, and the central portion 61 a of the pressing body 6 fitted into the recess 12 at the edge of the recess 12 of the socket 1. The output shaft 3 can be pulled out from the socket 1 by pushing down.
[0031]
With the configuration as described above, the rubber elastic body 5a is used instead of a member such as a metal coil spring for the elastic body while the socket 1 can be easily attached to the output shaft 3. Therefore, when the tool is used, even if the elastic body 5a and the inner side surface 43 of the bottomed hole 4 slide due to impact force or vibration, the rubber elastic body 5a is hardly worn, and the elastic body 5a is damaged. Thus, it is possible to prevent the performance from deteriorating.
[0032]
Next, an example using another elastic body 5b will be described with reference to FIG. In the example shown in FIG. 1, the elastic body 5a is formed in a cylindrical shape having a diameter substantially the same as or slightly smaller than the diameter of the middle portion of the bottomed hole 4, whereas FIG. In this example, the elastic body 5b is formed in a cylindrical shape having a diameter smaller than the diameter of the middle portion of the bottomed hole 4 over the entire length in the length direction, and the inner side surface 43 of the bottomed hole 4 and the elastic body It arrange | positions so that the clearance gap 8 may be formed between 5b.
[0033]
By doing in this way, it becomes possible to suppress further that the clearance gap 8 becomes a margin of deformation of the elastic body 5b, and the elastic body 5b slides and wears on the inner side surface 43 of the bottomed hole 4.
[0034]
Next, an example using another elastic body 5c will be described with reference to FIG. In the upper example shown in FIG. 2, the elastic body 5b is formed in a cylindrical shape having a diameter smaller than the diameter of the middle portion of the bottomed hole 4 over the entire length in the longitudinal direction. In the present example shown in FIG. 3, the diameter d of the central portion in the drilling direction of the bottomed hole 4 is provided with the elastic body 5c.₁The diameter d of both ends in the direction₂Is to make it smaller. More specifically, both end portions d in the direction of the bottomed hole 4 of the elastic body 5c.₂The diameter of the center portion of the bottomed hole 4 is substantially the same as or slightly smaller than the diameter of the middle portion of the bottomed hole 4, and the diameter d of the central portion of the elastic body 5 c in the direction of the bottomed hole 4₁Is formed in a cylindrical shape having a diameter smaller than the diameter of the middle portion of the bottomed hole 4, and a gap 8 is formed between the inner side surface 43 of the bottomed hole 4 and the elastic body 5 c.
[0035]
By doing in this way, the clearance gap 8 can be formed between the center part of the elastic body 5c, and the inner surface 43 of the bottomed hole 4, and the elastic body 5c is slid on the inner side surface 43 of the bottomed hole 4, and is worn. The diameter d of both ends of the elastic body 5c can be suppressed.₂Is substantially the same as or slightly smaller than the middle part of the bottomed hole 4, so that the elastic body 5 c is arranged with good stability without being twisted by the bottomed hole 4 due to a fall or the like in the bottomed hole 4. It becomes possible to do.
[0036]
Next, an example using another elastic body 5 will be described with reference to FIG. This is because a plurality of elastic bodies 5 are arranged in pressure contact in the direction of drilling the bottomed hole 4, and at least one of these elastic bodies 5 forms a gap 8 between the inner side surface 43 of the bottomed hole 4. It is intended to be done. More specifically, in this example shown in FIG. 4, two elastic bodies 5 d and 5 e are arranged, and the elastic body 5 e arranged at the bottom 41 of the bottomed hole 4 is about the middle of the bottomed hole 4. The bottomed hole 4 is formed in a cylindrical shape having a diameter smaller than the diameter of the portion, and is arranged so that a gap 8 is formed between the inner surface 43 of the bottomed hole 4 and the elastic body 5e. The elastic body 5d disposed on the opening 42 side is formed in a cylindrical shape having a diameter substantially the same as or slightly smaller than the diameter of the middle portion of the bottomed hole 4. In addition, the lengths of the elastic bodies 5d and 5e (that is, the height in the columnar shape) are substantially ¼ of the depth of the bottomed hole 4 (that is, the length in the drilling direction). Is formed.
[0037]
By doing in this way, the clearance gap 8 can be formed between the elastic body 5 and the inner side surface 43 of the bottomed hole 4, and it suppresses that the elastic body 5 slides on the inner side surface 43 of the bottomed hole 4, and wears. In addition, the elastic body 5 can be disposed with good stability without being twisted by the bottomed hole 4 due to a fall in the bottomed hole 4 or the like.
[0038]
At this time, the hardness of the elastic body 5 in which the gap 8 is formed between the inner surface 43 of the bottomed hole 4 (that is, the elastic body 5e on the bottom 41 side of the bottomed hole 4 in the example shown in FIG. 4) is determined. The hardness of the other elastic body 5 (that is, the elastic body 5d on the opening 42 side of the bottomed hole 4 in the example shown in FIG. 4) may be lower.
[0039]
By doing so, it is possible to increase the amount of deformation by lowering the hardness of the elastic body 5 that is less likely to be slid by the inner side surface 43 of the bottomed hole 4 and lowering the elastic coefficient. .
[0040]
Next, an example using another elastic body 5f will be described with reference to FIG. In the elastic body 5a shown in FIG. 1, a through hole 51 is drilled in the direction of the bottomed hole 4 as shown in FIG.
[0041]
In this way, the compressive deformation of the elastic body 5f can be distributed not only in the outward direction but also in the inward direction, and the elastic body 5f is provided due to a fall in the bottomed hole 4 or the like. In addition to being able to arrange with good stability without being distorted by the bottom hole 4, when the pressing body 6 is formed in a spherical shape, the top of the pressing body 6 opposite to the central portion 61a (particularly, It is possible to accommodate the pressing body 6 with good stability by aligning the not-shown) with the through-hole 51.
[0042]
Next, another embodiment will be described based on FIG. Compared with the upper embodiment shown in FIGS. 1 to 5, instead of the elastic body 5, a pair of repulsive bodies 7 (7 a, 7 b) composed of magnets repelling each other by repulsive force are used, and further spherical Instead, a hemispherical pressing body 6a is used. The present embodiment shown in FIG. 6 is mostly the same as the upper embodiment shown in FIGS. 1 to 5, and therefore the description of the same parts is omitted.
[0043]
The repelling bodies 7a and 7b of the present embodiment are the same ones formed in a disk shape having a diameter substantially the same as or slightly smaller than the diameter of the middle part of the bottomed hole 4, and the upper and lower surfaces of the disks are Each of them has N and S poles. The pressing body 6a has a substantially hemispherical shape having a diameter substantially the same as or slightly smaller than the diameter of the middle portion of the bottomed hole 4. The repulsive body 7 is arranged in the bottomed hole 4 so that the two repellent bodies 7a and 7b face each other so that the N poles or the S poles face each other and repel each other by repulsive force. Is to be placed.
[0044]
By doing in this way, it becomes possible to use semi-permanently the repelling body 7 which elastically presses the press body 6a to the retaining opening edge 42a of the bottomed hole 4.
[0045]
At this time, as shown in FIG. 7, one of the opposing surfaces of the pair of repelling bodies 7 a and 7 b may be a concave surface 71 and the other may be a convex surface 72.
[0046]
By doing in this way, the area which the repulsion bodies 7a and 7b oppose can increase, and a repulsion force can be raised, and it becomes possible to miniaturize the repulsion body 7 which produces a predetermined repulsion force.
[0047]
【The invention's effect】
As described above, in the first aspect of the present invention, in the electric power tool in which the socket is detachably attached to the output shaft of the electric power tool body, the bottomed hole is formed in the direction perpendicular to the axial direction on the side surface of the output shaft. At the bottom of the bottomed holeAnd having a cross-sectional area of more than half of the cross-sectional area of the bottomed hole, and when arranged in the bottomed hole, a gap is formed between the inner surface of the bottomed holeA stretchable elastic body made of rubber is arranged, and a pressing body in which a spherical surface portion is formed on the surface facing the outside of the opening is arranged on the opening side of the bottomed hole, and the pressing body falls off from the bottomed hole. A retaining opening edge having an inner diameter smaller than the outer diameter of the spherical surface portion of the pressing body is formed on the opening edge of the bottomed hole, and the pressing body is elastically pressed to the retaining opening edge by an elastic body to thereby fix the central portion of the spherical surface portion. The elastic body is located at the bottom of the bottomed hole of the output shaft because it is located outside the opening of the bottomed hole and the central portion is fitted into a recess formed on the inner surface of the output shaft fitting recess of the socket. Since the rubber is made of rubber, it is possible to prevent the elastic body from being worn even if the elastic body and the side surface of the bottomed hole slide, and to prevent the elastic body from being damaged and the performance from deteriorating. CanAt this time, it is possible to further suppress the abrasion of the elastic body by sliding on the inner surface of the bottomed hole.
[0049]
And claims2In the invention described,In the power tool that detachably attaches the socket to the output shaft of the power tool body, a bottomed hole is drilled in a direction perpendicular to the axial direction on the side surface of the output shaft, and the bottom of the bottomed hole isThe diameter of the center part in the bottomed hole direction is smaller than the diameters of both end parts in the directionA stretchable elastic body made of rubber is arranged, and a pressing body in which a spherical surface portion is formed on the surface facing the outside of the opening is arranged on the opening side of the bottomed hole, and the pressing body falls off from the bottomed hole. A retaining opening edge having an inner diameter smaller than the outer diameter of the spherical surface portion of the pressing body is formed on the opening edge of the bottomed hole, and the pressing body is elastically pressed to the retaining opening edge by an elastic body to thereby fix the central portion of the spherical surface portion. The elastic body is located at the bottom of the bottomed hole of the output shaft because it is located outside the opening of the bottomed hole and the central portion is fitted into a recess formed on the inner surface of the output shaft fitting recess of the socket. Since the rubber is made of rubber, it is possible to prevent the elastic body from being worn even if the elastic body and the side surface of the bottomed hole slide, and to prevent the elastic body from being damaged and the performance from deteriorating. Yes, at this timeA gap can be formed between the center of the elastic body and the inner surface of the bottomed hole, and the elastic body can be prevented from being slid and worn on the inner surface of the bottomed hole. The diameter of both ends is almost the same as or slightly smaller than the middle part of the bottomed hole, so the elastic body can be placed in a stable manner without being twisted by the bottomed hole due to a fall, etc. It becomes possible.
[0052]
And claims3In the described invention, the above claims1 or 2In addition to the effects of the invention described in (1), since the through holes are drilled in the bottomed hole direction in the elastic body, it is possible to disperse the compressive deformation of the elastic body not only in the outer direction but also in the inner direction. The elastic body can be arranged with good stability without being twisted in the bottomed hole due to a fall or the like in the bottomed hole.
[0053]
And claims4In the described invention, in the power tool in which the socket is detachably attached to the output shaft of the power tool body, a bottomed hole is formed in a side surface of the output shaft in a direction perpendicular to the axial direction, A pair of repulsive bodies made of magnets that repel each other by repulsive force are disposed on the bottom, and a pressing body having a spherical surface portion formed on a surface facing outward of the opening is disposed on the opening side of the bottomed hole. A retaining opening edge having an inner diameter smaller than the outer diameter of the spherical surface portion of the pressing body that prevents the bottomed hole from falling off is formed at the opening edge of the bottomed hole, and the pressing body is pressed against the retaining opening edge by a repelling body. Since the central portion of the spherical surface portion is located outside the opening of the bottomed hole, and the central portion is fitted into the recess formed on the inner surface of the output shaft fitting recess of the socket, the pressing body is It becomes possible to use the repelling body which is elastically pressed against the retaining opening edge of the semipermanently.
[0054]
And claims5In the described invention, the above claims4In addition to the effects of the described invention, since one of the opposing surfaces of the pair of repulsive bodies is a concave surface and the other is a convex surface, the opposing area of the repelling body can be increased to increase the repulsive force, It is possible to reduce the size of a repelling body that generates a predetermined repulsive force.
[Brief description of the drawings]
1A and 1B show a main part of an embodiment of the present invention, in which FIG. 1A is a cross-sectional view showing a state where no force is applied to a pressing body, and FIG. 1B is a cross-sectional view showing a state where a force is applied to the pressing body; is there.
FIG. 2 is a cross-sectional view of a main part of an example using another elastic body in the embodiment.
FIG. 3 is a cross-sectional view of a main part of an example in which still another elastic body is used in the embodiment described above.
FIG. 4 is a cross-sectional view of a main part of an example in which still another elastic body is used in the embodiment described above.
FIGS. 5A and 5B show an example in which another elastic body is used in the embodiment, wherein FIG. 5A is a cross-sectional view of a main part, and FIG. 5B is a perspective view of the elastic body.
6A and 6B show a main part of another embodiment, in which FIG. 6A is a cross-sectional view showing a state in which no force is applied to the pressing body, and FIG.
FIG. 7 is a cross-sectional view of a main part of an example using another repellent body in the embodiment.
FIG. 8 is an explanatory diagram for explaining the entire power tool.
FIG. 9 is an explanatory diagram of a conventional example.
FIGS. 10A and 10B are explanatory views of the fitting of the socket to the output shaft in another conventional example, in which FIG. 10A shows a state where the socket is placed on the tip of the output shaft, and FIG. (C) shows a state in which the pressing body is fitted into the through hole of the socket, and (d) shows a state in which the bottomed hole is closed by closing the through hole formed in the output shaft with a plug member. It is explanatory drawing in the case of forming.
[Explanation of symbols]
1 socket
11 Output shaft insertion recess
12 recess
2 Power tool body
3 Output shaft
4 Bottomed hole
41 bottom
42 opening
42a Stop opening edge
5 Elastic body
6 Pressing body
61 Spherical surface
61a Summit

Claims (5)

In a power tool in which the socket is detachably attached to the output shaft of the power tool body, a bottomed hole is drilled in a direction perpendicular to the axial direction on the side surface of the output shaft, and the bottomed hole is cut off at the bottom of the bottomed hole. A stretchable elastic body made of rubber having a cross-sectional area of more than half of the area and having a gap formed between the bottom surface and the inner surface of the bottomed hole is disposed. A pressing body in which a spherical surface portion is formed on the surface facing the outside of the opening is disposed on the opening side of the bottom hole, and the outer diameter of the spherical surface portion of the pressing body that prevents the pressing body from falling off the bottomed hole Forming a retaining opening edge with a small inner diameter at the opening edge of the bottomed hole, and pressing the pressing body to the retaining opening edge by an elastic body to position the central portion of the spherical surface portion outside the opening of the bottomed hole, An electric tool characterized in that a central portion is fitted into a recess formed on an inner surface of an output shaft insertion recess of a socket. In the electric tool in which the socket is detachably attached to the output shaft of the electric tool body, a bottomed hole is formed in a side surface of the output shaft in a direction perpendicular to the axial direction, and the bottom of the bottomed hole is formed in the direction of the bottomed hole. A pressing body in which a stretchable elastic body made of rubber whose diameter at the center is smaller than the diameter at both ends in the above direction is disposed, and a spherical surface portion is formed on the opening facing side of the bottomed hole. A retaining opening edge having an inner diameter smaller than the outer diameter of the spherical surface portion of the pressing body that prevents the pressing body from falling off the bottomed hole is formed on the opening edge of the bottomed hole, and the pressing body is formed by the elastic body. The center of the spherical surface is positioned outside the opening of the bottomed hole, and the center is fitted into a recess formed on the inner surface of the output shaft insertion recess of the socket. An electric tool characterized by that. The power tool according to claim 1 or 2, wherein a through hole is formed in the elastic body in a direction of a bottomed hole. In a power tool in which a socket is detachably attached to an output shaft of a power tool body, a bottomed hole is formed in a side surface of the output shaft in a direction perpendicular to the axial direction, and the bottom of the bottomed hole repels each other by repulsive force. A pair of repulsive bodies made of magnets are arranged, a pressing body in which a spherical surface portion is formed on the surface facing the outside of the opening is arranged on the opening side of the bottomed hole, and the pressing body is dropped from the bottomed hole. A retaining opening edge having an inner diameter smaller than the outer diameter of the spherical surface portion of the pressing body to be blocked is formed on the opening edge of the bottomed hole, and the pressing body is elastically pressed to the retaining opening edge by a repelling body to have a central portion of the spherical surface portion. An electric power tool characterized by being positioned outside the opening of the bottom hole, and having the central portion fitted into a recess formed on an inner surface of the output shaft fitting recess of the socket. 5. The electric tool according to claim 4, wherein one of the opposing surfaces of the pair of repulsors is a concave surface and the other is a convex surface.

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