JP5117244B2 - Electric tool - Google Patents

Description

  The present invention relates to an electric tool that can be screwed in a hand-held state, and more particularly to an electric tool in which a plurality of lighting tools are mounted on a change ring for changing a set rotational torque of a tip tool.

The electric tool relevant to this is described in Patent Document 1.
As shown in FIG. 7A, this electric tool has a change ring 105 for changing the set rotational torque of the end tool coaxially attached to the front end portion of the housing 102, and an axial center with respect to the housing 102. It is configured to be rotatable around. Furthermore, four lighting fixtures 106 are attached to the tip of the change ring 105 at equal intervals in the circumferential direction.
The four lighting fixtures 106 are attached to a disk-like substrate 107 fixed inside the change ring 105. As shown in FIG. 7B, the disc-shaped substrate 107 includes a positive semicircular conductor portion 108a and a negative semicircular conductor portion 108b to which the terminals of the four illuminators 106 are connected. The semicircular conductor portions 108a and 108b are exposed and arranged so as to be located on the same center circle on the back surface side of the substrate 107. The power source plus terminal 109a and the minus terminal 109b provided at fixed positions on the housing 102 side can slide relative to the positive and negative semicircular conductor portions 108a and 108b of the substrate 107, respectively. Touching from the direction. As a result, the four illuminators 106 are turned on simultaneously, so that the periphery of the tip tool can be illuminated well during work.

DE 3831344 A1

As described above, the positive and negative semicircular conductor portions 108 a and 108 b of the substrate 107 in the change ring 105 are exposed so as to be positioned on the same central circle on the back surface side of the substrate 107. That is, the positive-side and negative-side semicircular conductor portions 108a and 108b are each formed within a range of about 180 ° in the circumferential direction. Therefore, when the change ring 105 is rotated by 180 ° or more with respect to the power supply plus terminal 109a and the minus terminal 109b on the housing side, the semicircular conductor portions 108a and 108b on the change ring 105 side are separated from the power supply terminals 109a and 109b on the housing side. It will come off.
In recent years, it is very common to rotate the change ring by 180 ° or more in order to make the torque adjustment range as large as possible. However, in the above configuration, the change ring 105 cannot be rotated by 180 ° or more with respect to the housing 102.

  The present invention has been made to solve the above-described problems, and the problem to be solved by the present invention is to prevent the changeable range of the change ring from being restricted even when a lighting fixture is attached to the change ring. It is to be.

The above-described problems are solved by the inventions of the claims.
According to the first aspect of the present invention, a change ring for changing the set rotational torque of the tip tool is attached to the housing so as to be rotatable about the axis center at the tip portion of the housing that rotatably supports the spindle. A power tool having a plurality of lighting fixtures mounted on the tip of the change ring at intervals in the circumferential direction, and the electric circuit for operating the lighting fixture is held coaxially with the change ring. A pair of annular conductive rings electrically isolated from each other, and electrically connected to the conductive ring, along the conductive rings by rotation of the change ring relative to the housing. circumferentially and a pair of terminals configured to be relatively slidable is provided, the terminal of the lighting device, the switch in a state other than the distal end portion is buried in the shaft-shaped supporting member Are passed through the housing section of the Njiringu, the tip of the terminal is characterized in that it is connected to the rear protrude in the installed conductive rings behind the change ring from the rear end face of the change ring.

According to the present invention, the electrical circuit of the luminaire includes a pair of annular conductive rings and a pair of terminals electrically connected to the conductive rings. The pair of terminals are configured to be relatively slidable in the circumferential direction along the conductive rings by rotation of the change ring with respect to the housing. For this reason, the electrical connection between the terminal and the conductive ring is ensured regardless of the rotation angle of the change ring with respect to the housing. Therefore, by using the terminal and the conductive ring, it becomes possible to turn on the illuminator regardless of the rotation angle of the change ring. That is, there is no inconvenience that the rotation range of the change ring is limited by attaching the lighting fixture to the change ring.
Moreover, since the terminal of a lighting fixture is the structure which only a front-end | tip part exposes from a support material, the terminal of a lighting fixture becomes difficult to deform | transform.

According to the invention of claim 2, the front end portion of the housing for rotatably supporting the spindle rotatably mounted about the axis relative to the change ring said housing for changing the setting rotational torque of the tip tool A first illuminator and a second illuminator are fixed to a tip of the change ring at intervals in a circumferential direction, wherein the first illuminator and the second illuminator The electric circuit for operating the lighting fixture includes a first annular conductive ring and a second annular conductive ring which are held coaxially with the change ring and electrically insulated from each other, and the first annular conductive ring, Electrically connected to the first annular conductive ring and the second annular conductive ring, and relative to each other along the conductive ring by rotation of the change ring relative to the housing. A first pair of terminals configured to be movable and electrically connected to the first annular conductive ring and the second annular conductive ring, the A second pair of terminals configured to be slidable in the circumferential direction along the conductive rings by rotation of the change ring is provided, and the first pair of terminals is provided behind the first lighting fixture. One pair of terminals is provided, and the second pair of terminals are provided behind the second lighting fixture .
According to the invention of claim 3 , the pair of conductive rings are fixed inside the housing, and one terminal of the lighting fixture is connected to one conductive ring, and the other conductive ring is connected to the other conductive ring. The terminal is connected, and one conductive ring can be connected to the positive side of the power supply circuit, and the other conductive ring can be connected to the negative side of the power supply circuit.
Thus, since the conductive ring is fixed to the housing side, the degree of freedom of arrangement of the conductive ring is improved.
According to the invention of claim 4, a groove extending in the circumferential direction is formed in the conductive ring, and the terminal is fitted in the groove.
For this reason, a terminal does not leave | separate to a radial direction with respect to a conductive ring, and the connection of the said terminal and a conductive ring is securable .

According to the invention of claim 5, one conductive ring and the other conductive ring have different diameters, and both the conductive rings are coaxially arranged in the same position in the axial direction. An insulating member is disposed between the other conductive rings .
For this reason, the axial direction dimension in the connection part of both electroconductive rings and a terminal can be made small.
According to the invention of claim 6, one conductive ring and the other conductive ring have different diameter dimensions, and both the conductive rings are arranged coaxially and offset in the axial direction. .

  According to the present invention, even if a lighting fixture is attached to the change ring, the rotatable range of the change ring is not limited.

(Embodiment 1)
Hereinafter, based on FIGS. 1-6, the electric tool which concerns on Embodiment 1 of this invention is demonstrated. The electric tool according to the present embodiment is an electric driver drill, and FIG. 1 shows a perspective view of the electric driver drill (hereinafter referred to as an electric tool) viewed from the right front. 2 is a partially cut-away side view of the electric tool viewed from the right side, FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2, and FIG. 4 is an enlarged view of a portion IV in FIG. FIG. 5 is a perspective view showing an illumination tool of the electric tool, and FIG. 6 is an electrical circuit diagram for illumination.
Here, front and rear, right and left, and top and bottom in the figure correspond to front and rear, right and left and top and bottom of the electric tool.

<About the outline of electric tools>
The electric power tool 10 includes a cylindrical housing main body 11 and a grip 12 formed so as to protrude downward from the lower surface side of the housing main body 11. A trigger-type switch lever 13 that is pulled by a user with a fingertip is provided at the upper end position (base end portion) of the grip portion 12. Further, a battery connecting portion 12 h to which a battery 17 serving as a power source of the electric tool 10 is connected is provided at the lower end portion (tip end portion) of the grip portion 12.
A cylindrical change ring 15 for adjusting the rotational torque of the tip tool (not shown) is mounted on the housing main body 11 of the electric tool 10 so as to be rotatable about the axis. Further, the tip of the spindle 25 (see FIG. 2) protrudes from the tip of the change ring 15 in the axial direction, and a chuck 14 that holds the tip tool is mounted around the tip of the spindle.
Further, the housing body 11 is formed with a scale indicating the set torque in the circumferential direction at the rear side position of the change ring 15.

As shown in FIG. 2, the housing 20 has a motor 20, a first planetary gear mechanism 21, a second planetary gear mechanism 22, and a third planetary gear mechanism 23 coaxially housed in order from the rear side. . The motor 20 is a drive source of the electric tool 10, and the rotation of the motor 20 is transmitted to the spindle 25 after being decelerated by the first to third planetary gear mechanisms 21, 22, and 23. Then, the rotational force of the spindle 25 is transmitted to the tip tool (not shown) via the chuck 14.
The change ring 15 rotates about the axis center with respect to the housing body 11 so that the spring force of the spring 15s that presses the outer ring gear 23p of the third planetary gear mechanism 23 from the axial direction (forward) can be increased or decreased. It is configured. That is, when the change ring 15 is rotated in the direction of large rotational torque, the spring force of the spring 15s is increased and the outer ring gear 23p is difficult to rotate. On the contrary, when the change ring 15 is rotated in the direction in which the rotational torque is small, the spring force of the spring 15s is reduced, and the outer ring gear 23p is easily rotated.

Here, when the planetary gear 23y of the third planetary gear mechanism 23 is rotated by the rotational force of the second planetary gear mechanism 22 and the outer ring gear 23p is not rotated, the planetary gear 23y rotates while being inward of the outer ring gear 23p. Move along. Thereby, the output shaft 23x holding the planetary gear 23y of the third planetary gear mechanism 23 and the spindle 25 connected to the output shaft 23x rotate. Conversely, when the planetary gear 23y and the outer ring gear 23p of the third planetary gear mechanism 23 are both rotated by the rotational force of the second planetary gear mechanism 22, the planetary gear 23y rotates at a fixed position. Thereby, the output shaft 23x holding the planetary gear 23y of the third planetary gear mechanism 23 does not rotate, and the spindle 25 does not rotate.
Therefore, when the spring force of the spring 15s is increased by the change ring 15 to increase the force required for the rotation of the outer ring gear 23p, the tip 25 is not affected even when the spindle 25 and the tip tool receive a large rotational reaction force from the screw or the like. Tools etc. are difficult to stop. That is, the rotational torque of the tip tool increases. Conversely, if the spring force of the spring 15s is reduced by the change ring 15 and the force required for the rotation of the outer ring gear 23p is reduced, the spindle 25 and the tip tool are also subjected to a relatively small rotational reaction force from a screw or the like. The tip tool or the like is easy to stop. That is, the rotational torque of the tip tool is reduced.

A speed switching lever 18 is provided on the upper surface of the housing body 11. The lever 18 is a lever that moves the outer ring gear 22p of the second planetary gear mechanism 22 back and forth. As shown in FIG. 2, the rotation of the outer ring gear 22p is prohibited when the outer ring gear 22p is in the front end position. Is done. Thereby, the rotation of the output gear 21 e of the first planetary gear mechanism 21 is decelerated by the second planetary gear mechanism 22 and transmitted to the third planetary gear mechanism 23. That is, the spindle 25 rotates at a low speed.
Conversely, when the outer ring gear 22p of the second planetary gear mechanism 22 is in the rear end position, the outer ring gear 22p meshes with the spline 21s of the output gear 21e of the first planetary gear mechanism 21. As a result, the outer ring gear 22p, the planetary gear 22y, and the output gear 22e of the second planetary gear mechanism 22 are integrally rotated together with the output gear 21e of the first planetary gear mechanism 21, and the rotation of the output gear 22e is the third planetary gear. It is transmitted to the mechanism 23. That is, the rotation of the output gear 21 e of the first planetary gear mechanism 21 is not decelerated by the second planetary gear mechanism 22 and is transmitted to the third planetary gear mechanism 23 as it is. For this reason, the spindle 25 rotates at a high speed.

<About the lighting unit>
Next, the illumination unit 40 of the electric tool 10 will be described.
As shown in FIGS. 3 to 5, the lighting unit 40 includes three lighting fixtures 41 attached to the change ring 15, a ring-shaped member 44 to which the lighting fixtures 41 are connected, and the lighting fixture 41. And an electric circuit 50 to be lit.
As shown in FIG. 5 (A), the illuminator 41 includes an LED 42 and a support member 43 that supports the LED 42. The support member 43 is a resin material formed in an axial shape, and the LED 42 is coaxially attached to the tip side. As shown in FIG. 4, the LED 42 includes two rod-like terminals 42 t protruding rearward from the back side of the LED 42, and these terminals 42 t are embedded in the support member 43. And the front-end | tip part of those terminals 42t protrudes from the base end surface of the support material 43 to the axial direction (backward).
On the inner wall surface of the change ring 15, as shown in FIG. 4, three storage grooves 15m extending in the axial direction from the front end to the rear end of the change ring 15 are formed at intervals of 120 ° in the circumferential direction. And the lighting fixture 41 is accommodated in those accommodation grooves 15m. The illuminating device 41 is housed in the housing groove 15m of the change ring 15 so that the LED 42 is on the front side, and is fixed to the housing groove 15m. And the front-end | tip part of the terminal 42t of the lighting fixture 41 protrudes back from the storage groove 15m of the change ring 15. FIG.
That is, the storage groove 15m of the change ring 15 corresponds to the storage portion of the present invention.

Inside the housing main body 11, as shown in FIG. 4, a ring-shaped member 44 to which the terminal 42 t of the lighting fixture 41 is connected at the rear position of the change ring 15 is fixed coaxially with the change ring 15.
As shown in FIGS. 5A and 5B, the ring-shaped member 44 has a large-diameter first conductive ring 45, a small-diameter second conductive ring 46, and both the conductive rings 45 and 46 coaxially. The resin ring 47 is held at the same position in the axial direction and insulated from each other. That is, the resin ring 47 corresponds to the insulating member of the present invention.
The first and second conductive rings 45 and 46 are made of metal, and as shown in FIG. 5B, the cross-sectional shape is formed in a substantially horizontal U-shape. That is, the first and second conductive rings 45 and 46 are formed with grooves 45m and 46m that are open on the front surface side so as to continuously extend in the circumferential direction, with respect to the grooves 45m and 46m. The terminal 42t of the lighting device 41 is fitted from the axial direction.

For this reason, when each illuminator 41 rotates together with the change ring 15, both terminals 42t of each illuminator 41 slide in the circumferential direction along the grooves 45m and 46m of the first and second conductive rings 45 and 46, respectively. To come. That is, regardless of the rotation of the change ring 15, the electrical connection between the both terminals 42 t of the lighting fixture 41 and the first and second conductive rings 45 and 46 is ensured.
The resin ring 47 of the ring-shaped member 44 is molded, for example, by injecting resin into the molding die in a state where the first and second conductive rings 45 and 46 are inserted into the molding die (not shown). The
Further, first and second lead wires 55 and 56 connected to the first and second conductive rings 45 and 46, respectively, are provided at the lower end of the ring-shaped member 44.

As shown in FIG. 6, the electric circuit 50 of the lighting unit 40 illuminates the first and second lead wires 55 and 56 of the ring-shaped member 44 and the first and second conductive rings 45 and 46. It is comprised so that electric power can be supplied with respect to the tool 41. FIG. That is, the electric circuit 50 is an electric circuit that uses the battery 17 of the electric tool 10 as a power source, and includes a control unit 51 that is turned on when the switch lever 13 is pulled. The control unit 51 is configured to be able to output to the switch unit 53 in a state where the ON signal of the switch lever 13 is held for a predetermined time. The switch unit 53 is installed in series with each of the lighting fixtures 41, the first and second conductive rings 45, 46, and the like, and each of the lighting fixtures 41 is turned on by a signal from the control unit 51. Light up. In addition, the resistor 54 installed in series with respect to each illuminating device 41 is used for current adjustment.
That is, when the switch lever 13 is pulled, the switch unit 53 is turned on for a predetermined time, and the respective lighting fixtures 41 are turned on.

<Advantages of the electric power tool according to this embodiment>
According to the electric power tool 10 according to the present embodiment, the electric circuit 50 of the luminaire 41 includes a pair of annular conductive rings 45 and 46 and a pair of terminals 42 t electrically connected to the conductive rings 45 and 46. (Terminal 42t of the illuminator 41). The terminal 42t of the illuminating device 41 is configured to be slidable in the circumferential direction along the conductive rings 45 and 46 by the rotation of the change ring 15 with respect to the housing body 11. For this reason, the electrical connection between the terminal 42 t of the illuminating device 41 and the conductive rings 45 and 46 is ensured regardless of the rotation angle of the change ring 15 with respect to the housing body 11. Therefore, by using the terminal 42 t of the lighting fixture 41 and the conductive rings 45 and 46, the lighting fixture 41 can be turned on regardless of the rotation angle of the change ring 15. That is, there is no problem that the rotation range of the change ring 15 is limited by attaching the lighting device 41 to the change ring 15.

In addition, grooves 45m and 46m extending in the circumferential direction are formed in the conductive rings 45 and 46, and the terminal 42t of the lighting device 41 is fitted into the grooves 45m and 46m. For this reason, the terminal 42t of the illuminating device 41 is not radially separated from the conductive rings 45 and 46, and the contact between the terminal 42t and the conductive rings 45 and 46 can be ensured.
Further, the first conductive ring 45 of the ring-shaped member 44 has a larger diameter than the second conductive ring 46, and both the conductive rings 45, 46 are coaxially arranged at the same position in the axial direction. A resin ring 47 is disposed between the conductive ring 45 and the second conductive ring 46. For this reason, the axial direction dimension in the connection part of both the conductive rings 45 and 46 and the terminal 42t of the lighting fixture 41 can be made small.
Further, since the terminal 42t of the lighting fixture 41 is configured such that only the tip portion is exposed from the support member 43, the terminal 42t of the lighting fixture 41 is difficult to deform.

<Example of change>
Here, the present invention is not limited to the above-described embodiment, and can be modified without departing from the gist of the present invention. For example, in the present embodiment, the first and second conductive rings 45 and 46 are fixed inside the housing body 11, and the illumination on the change ring 15 side with respect to the grooves 45 m and 46 m of both the conductive rings 45 and 46. The example which fits the terminal 42t of the tool 41 was shown. However, the first and second conductive rings 45 and 46 are provided at the rear end portion of the change ring 15 in a state where the first and second conductive rings 45 and 46 are connected to the terminal 42t of the lighting fixture 41, and the grooves 45m and 46m of the both conductive rings 45 and 46 are provided from the rear. A configuration in which the first and second lead wires 55 and 56 are fitted is also possible. In this case, the first and second lead wires 55 and 56 correspond to the terminals of the present invention.
In the present embodiment, the first and second conductive rings 45 and 46 are coaxially positioned at the same position in the axial direction, and the resin ring 47 is disposed between the both conductive rings 45 and 46. Indicated. However, it is also possible to form the first and second conductive rings 45 and 46 by shifting them in the axial direction. Thereby, the freedom degree at the time of accommodating the 1st, 2nd electroconductive rings 45 and 46 in the housing main-body part 11 improves.
Moreover, in this embodiment, the example which connected the terminal 42t of the three lighting fixtures 41 to the 1st, 2nd electroconductive rings 45 and 46 was shown individually. However, the positive side terminals of the respective lighting fixtures 41 are grouped together on the change ring 15 side, the negative side terminals are grouped together on the change ring 15 side, and one positive side terminal and negative side terminal are grouped into the first and second conductive rings. It is also possible to connect to 45 and 46.
Moreover, although the example which provides the three lighting fixtures 41 in the change ring 15 was shown, the number of the lighting fixtures 41 can be changed suitably.

It is the perspective view which looked at the electric tool which concerns on this embodiment from the right front. It is a partially broken side surface when the electric tool is viewed from the right side. It is the III-III arrow line view of FIG. It is the IV section enlarged view of FIG. It is a perspective view (A figure) showing the illumination unit of an electric tool, and BB arrow sectional drawing (B figure) of A figure. It is an electrical circuit diagram for illumination. It is the perspective view (A figure) of the conventional electric tool, and the top view (B figure) showing a part of electric circuit of a lighting fixture.

Explanation of symbols

11 .... Housing body (housing)
15 ... Change ring 15m ... Storage groove 25 ... Spindle 40 ... Illumination unit 41 ... Illuminator 42t ... Terminal 43 ... Support material 44 ... Ring-shaped member 45... First conductive ring 45 m... Groove 46... Second conductive ring 46 m.
50 ... Electric circuit 55 ... Lead wire (terminal)
56... Lead wire (terminal)

Claims (6)

A change ring for changing the set rotational torque of the end tool is rotatably attached to the housing at the front end portion of the housing that rotatably supports the spindle. Is a power tool in which a plurality of lighting fixtures are mounted at intervals in the circumferential direction,
In the electric circuit for operating the lighting device,
A pair of annular conductive rings held coaxially with the change ring and electrically insulated from each other;
A pair of terminals electrically connected to the conductive ring and configured to be slidable in a circumferential direction along the conductive ring by rotation of the change ring with respect to the housing; And
The terminal of the illuminator is passed through the storage portion of the change ring in a state where the other end portion is embedded in a shaft-shaped support member, and the front end portion of the terminal projects rearward from the rear end surface of the change ring. The power tool is connected to a conductive ring installed behind the change ring . A change ring for changing the set rotational torque of the end tool is rotatably attached to the housing at the front end portion of the housing that rotatably supports the spindle. Is a power tool in which the first lighting tool and the second lighting tool are fixed at intervals in the circumferential direction,
In the electric circuit for operating the first lighting tool and the second lighting tool,
A first annular conductive ring and a second annular conductive ring held coaxially with the change ring and electrically insulated from each other;
Electrically connected to the first annular conductive ring and the second annular conductive ring, and relative to each other along the conductive ring by rotation of the change ring relative to the housing. A first pair of terminals configured to be slidable, and
Electrically connected to the first annular conductive ring and the second annular conductive ring, and relative to each other along the conductive ring by rotation of the change ring relative to the housing. And a second pair of terminals configured to be slidable,
An electric tool characterized in that the first pair of terminals are provided behind the first lighting fixture, and the second pair of terminals are provided behind the second lighting fixture . The electric tool according to claim 1 or 2,
The pair of conductive rings are fixed inside the housing, and one terminal of the lighting fixture is connected to one conductive ring, and the other terminal of the lighting fixture is connected to the other conductive ring. And
An electric tool characterized in that one conductive ring is connectable to the positive side of the power supply circuit and the other conductive ring is connectable to the negative side of the power supply circuit . The electric tool according to any one of claims 1 to 3,
A groove extending in the circumferential direction is formed in the conductive ring, and the terminal is fitted in the groove . The electric tool according to any one of claims 1 to 4, wherein
One conductive ring and the other conductive ring have different diameters, and both the conductive rings are coaxial and arranged in the same axial direction, and insulation is provided between one conductive ring and the other conductive ring. A power tool characterized in that a member is disposed. The electric tool according to any one of claims 1 to 4, wherein
An electric power tool characterized in that one conductive ring and the other conductive ring have different diameters, and the two conductive rings are arranged coaxially and offset in the axial direction .

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