JPH0230475A - Blocking device for wiring of power tool - Google Patents

Abstract

PURPOSE:To easily perform an assembly check with visual observation by providing a spring post at one side of a wiring block assembly. CONSTITUTION:An armature assembly in the motor used for a power tool, etc., has a commutator and field coil 18 and the wiring block device of this motor is equipped with the insulated plate having the center opening for storing the commutator and the mounts 30, 31 placed in opposition for supporting brush holders. 32, 33 by their arranging so as to operate a brush for the commutator. Projection parts 43, 44 are provided on the wall face at one side of these amounts 30, 31, spring posts 39, 40 are provided at one side of a plate 29 at the vicinity of the mounts 30, 31 and the horizontal finger like parts 45, 46 of one end of the springs 41, 42 arranged at these posts 39, 40 are hung on the projection parts 43, 44. The assembly check can easily be performed with visual observation by providing the spring posts 39, 40 like this.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a power wiring device inside a housing of a power tool such as an electric drill.

[Background of the invention]

An example of a power tool according to the prior art is shown in FIG. The internal power wiring of this power tool connects the switch, stator coil, carbon brush holder, and forward/reverse switch with lead wires. This lead wire uses a conductor stranded wire coated with insulation. This is because it is easy to deform and easy to cut, so it is easy to process and has a high degree of freedom. However, recently, the problem of lack of skilled labor,
There is a production demand for a shift to automation of assembly work,
When lead wires are used for internal power wiring, the lead wires are easily deformed, which makes it difficult to stabilize the lead wire wiring work, which is a factor that hinders improvement in the efficiency of assembly work. This is also an obstacle in promoting automation of wiring work. Furthermore, since the lead wires are sometimes assembled with them being caught in the housing, there were requests for improvements in terms of safety.

[Purpose of the invention]

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, improve assembly workability, and at the same time increase the safety of this type of power tool.

[Summary of the invention]

The present invention incorporates a connecting member in an insulating rigid body so that electrical connections between a switch, a stator coil, a carbon brush holder, etc. can be made by arranging each component in a fixed position in a fixed order, In addition, by appropriately using a connector with spring properties, internal power wiring of a power tool can be easily implemented.

[Embodiments of the invention]

FIG. 1, which explains an embodiment of the present invention with reference to the accompanying drawings, shows a side view of a portable electric drill 10. The drill 10 has a case All and a case B12 which are divided into two parts and mesh with each other, and includes a drill chuck assembly 13 protruding from the tips of the case All and the case B12. For explanation,
A part of the case B12 is removed to expose the inside. The lower part of case All and case B12 has a screw 1 with an ON10FF switch 14 provided at a suitable position.
- It is formed into a le grip 15. A power cord 16 connects the drill 10 to a power source such as an ordinary household AC line (not shown). The motor 17 is of known design and includes a field assembly 19 with a field winding 18;
The field assembly 19 includes case All and case B1.
2 securely hold the case A11 and case B12.
It is stationary against. Inside the field assembly 19,
An armature 20 is rotatably arranged on the shaft 21. The shaft 21 is connected at one end to a gear assembly for driving the chuck assembly 13 and the drill bit. At the other end of the shirt 1 21, an armature assembly 23 including a commutator 22 is rotatably attached. A power wiring block assembly 24 including a switch 14 and a power cord 16 are housed in the grip 15. The power wiring block assembly 24 is connected to the bridge assembly 25 and supplies power to the motor 17.

The power distribution means according to the present invention will be explained in detail with reference to FIGS. 1 to 19. FIG.

In accordance with the present invention, a motor 1 has an armature assembly 23 including a field winding 8 providing a field and a commutator 22.
The wiring flock assembly 26 for No. 7 is comprised of a molded plate made of insulating material with a hole in the center to accommodate the armature assembly 23. In one embodiment, the molding plates 1-- are designated with the reference numeral 29. In assembly, plate 29 is attached to one end of field assembly 9.

In other words, four plate-shaped plugs 96 protruding from the plate 29 are connected to the field winding 18 in socket chambers 98 that stand perpendicularly to the terminal block 97 provided at one end of the field assembly 19, respectively. It is inserted into 99.

Furthermore, according to the invention, a mount 1- is provided opposite the plays 1-29 to operatively support the brush holder and the brush relative to the commutator. The mount is integrally molded into and extends from one side of the plate 29. As in this embodiment, mounts 30 and 31 consist of walls extending perpendicularly from one side of plate 29. Mounts 3o and 31 are arranged to accommodate and fix brush holders 32 and 33, respectively.

Each brush holder 32 and 33 has a brush 28
to be slidably held. That is, when plays 1 to 29 are positioned as shown in FIG.
2 commutator bars (not shown). Brush holders 32 and 33 may be constructed of copper, brass, or other suitable alloy.

As can be seen from FIGS. 2 to 6, the brush holders 32 and 33 are located inside the respective mounts 30 and 31, have the same shape and dimensions, have a rectangular cross section, and are compatible. To this end, a scissor fit is formed between the brush holder and the mount 1;
5 is held within the remount 1. Further, a J-shaped claw 36 is formed adjacent to the brim 35 of the brush holder, and engages with a slope 38 provided with a step 37 at the bottom of the mount 1-. The two wall surfaces of the mounts 30 and 31 are tapered so that the claws 36 of the brush holder can be smoothly elastically deformed. Claw 36
When it passes over the step 37, the claw 36 is elastically deformed and cannot go back over the step 37, so removal is stopped.

According to the present invention, a spring post is provided to axially support a spring for biasing the brush 34 toward the commutator 22. The spring post is play 1.
are integrally molded on one side of the mount 1 so as to extend therefrom, and each spring post is disposed adjacent to the respective mount 1 .

In this embodiment, the spring posts 1-39 and 40
In the vicinity of mounts 30 and 31, plays 1-
It consists of 29 cylinders standing vertically on one side.

Coaxially attached to spring posts 39 and 40 is brush 3.
Springs 41 and 42 are arranged to bias 4 toward one side.

In order to securely hold the springs 41 and 42 in the respective spring posts 1 to 39 and 40, protrusions 43 and 44 are provided on one side wall of the mounts 30 and 31, so that one end of the springs 41 and 42 is held horizontally. Hook the fingers 45 and 46 to ensure the spring 4]
- and retain 42.

In this embodiment, the mounts I-30 and 31 and the spring posts 39 and 40 are molded as one body with the plays 1 to 29, but the mounts and spring posts are formed separately and are later bonded to the plate or subjected to ultrasonic wave treatment. It may be fixed using the following method. Another method is to form the mount and spring post parts together and fix them to the plate later.

The invention also includes a circuit pattern embedded in the plate.

In the embodiment shown in FIG. 4, the circuit pattern is designated by reference numeral 47. The circuit pattern can be understood with reference to FIGS. 3 to 8. Since the circuit pattern 47 is embedded in the plate 29, the entire circuit pattern 47 is not shown in FIG. 4, but the entire circuit pattern is schematically shown in FIG. Circuit pattern 47 is formed of copper or a similar conductive material.

In accordance with the present invention, springs 41 and 42 are inserted into spring posts 39 and 40, and the horizontal fingers 45 and 46 of the respective springs are latched onto projections 43 and 44 on the lower portion of the walls of mounts 30 and 31. However, the carbon 34 placed in the brush holders 32 and 33 can be biased toward the commutator 22 at the other end of the spring. Parts of the brush holder contact portions 65 and 66 of the circuit pattern 47 are exposed on one of the pair of walls constituting the mounts 30 and 31, and can be electrically connected when the brush holders 32 and 33 are inserted. The invention also allows choke coils to be included in the circuit to absorb electrical noise generated by the motor. Figure 9 is the fourth
It is a sectional view taken along the line 1-1 in the figure. The deep holes 68 and 69 on the surface of the plate 28 are part of the conductor 70 of the circuit pattern 47.
The positioning holes 71 and 72 provided in the conductor 70 are used to position the conductor 70. In addition, the shallow holes 73 and 74 are formed with the conductor 7 during molding.
This is a hole made by a jig that holds down the 0 so that it does not move. The holes 75 and 76 are formed by a jig that holds the conductor 70 so that it does not deform. Choke coil 67 is in hole 7
5 or 76 as a punch hole and cut the conductor 70 in the plate 29 by drilling with a drill etc.
Lead wires 77 and 78 coming out from both ends of the choke coil 67 are passed through the holes 71 and 72 and soldered. It is necessary to take into account chamfering the corners of the deep holes 68 and 69 and pay attention to breakage of the lead wires due to vibration. conductor 7
In addition to using a drill, the holes 75 and 76 can be made large and punched out using a press or the like.In the present invention, the electric drill 10 is equipped with a forward/reverse switching device 50 in order to cause the electric drill 10 to rotate forward and backward. has been established. Plate-shaped parallel terminals A and 5 protrude from the top of the wiring block assembly 24
1a, B, 51b, C151c, and D, 51d are arranged in parallel at suitable intervals. The four switching terminals 52 of the forward/reverse switching device 50 are plate-shaped and arranged in parallel, and are in contact with the side surfaces of the terminals A, B, C, and D51a-d. A terminal cover 80 is attached to the lower part of the forward/reverse switching device 50. As shown in FIG. 11, a tongue piece 82 protrudes from the terminal storage chamber 81 so as to intersect with the switching terminal 52. By suitably determining the gap between the switching terminal 52 and the tongue 82, when the parallel terminal 51 provided on the upper part of the wiring block assembly 24 is inserted into this gap, the tongue will be removed even if the position of the terminal is slightly shifted. The elasticity of 82 allows the parallel terminal 51 and the switching terminal 52 to come into contact with each other. Although the shape of the terminal cover 80 is shown in FIGS. 12 and 13, it is preferably formed by integral molding, and the material is preferably a resin having elasticity, heat resistance, and good insulation properties, such as nylon.

The invention also extends to a power wiring block assembly 24 that includes an ON10 FF switch 14. The switch 14 is fixed with screws 84 to a substrate 83 on which a wiring pattern is arranged.

The screw 84 also serves as a conductor. The lead wire of the power cord 16 is fixed to the input terminal using a rod-shaped set screw 85. Wiring block assembly 26 on top of the board
There is a tab terminal 86 for connecting to.

Although it is inexpensive to form the substrate 83 flat, it is difficult to position it when fixing the switch 14.

When fixing the power cord, the step of temporarily fixing the bar-shaped set screw 85 in the screw hole of the input terminal and then fixing the lead wire of the power cord is performed. Therefore, if the 687 is formed so that the switch 14 with the set screw 85 temporarily fixed can be fixed to the board 83, the switch 14 can be easily positioned by using one end of the rod-shaped set screw 85, and at the same time, the switch 14 can be easily positioned. In this state, the lead wire of the power cord 16 can be attached or detached. Power wiring block Kumi 24
When fixing to the case B12, the switch 14 should be fixed. If the board 83 is fixed, a load is applied to the screws 84 every time the switch 14 is operated, causing the screws to loosen, resulting in poor conduction. Furthermore, in accordance with the present invention, bridge assembly 25 connects between power receiving terminals 88 and 89 of wiring block assembly 26 and tab terminal 86 of power wiring block assembly 24 . Power receiving terminal 8
8 and 89 extend perpendicularly from the plate 86 of the wiring block assembly 86, and have terminal portions bent at right angles. It is desirable that the terminal spacing be equal to the l1jl spacing of the tab terminals 86 of the power wiring block assembly 24.

Bridge assembly 25 consists of a case 90 and two plate terminals 91. Plate 1 to terminal 91 are made of brass, phosphor bronze, or other suitable alloy. A plurality of continuous tongues 92 or one continuous tongue 92 formed by cutting out the center.
The plate terminal 9 is provided with a plurality of or one continuous notch 93 provided at the lower end.

The case 90 has two narrow grooves 94 passing through it, and both ends of the grooves are stepped at the bottom. A square groove 95 with an eave that accommodates the tongue 92 of the plate terminal 91 from the bottom direction is the groove 9.
3 and 94 have the required number. When the plate terminal 91 is inserted into the case 9o, the tongue 92 that has been spread out in the square groove 95 is released, and the upper part of the plate terminal 91 hits the step at the bottom of the groove 93, so that the plate terminal 91
is fixed to the case 90. The tongue 92 creates an elastic effect.

According to the present invention, if the bridge assembly 25 is arranged so as to cover the power receiving terminals 88 and 89 of the wiring block assembly 26 and the dub terminal 86 of the power wiring block assembly 24, the plate terminal 91 will have no groove 9.
3, the bridge assembly 25 can be easily inserted. Moreover, since the longitudinal direction is sufficiently long, alignment is easy.

The bridge assembly based on the present invention has an L-shaped case,
If the play 1 to the terminals are shaped into an S-shape or the like according to the shape of the case, they can perform one function. It is also possible to make it long.

〔Effect of the invention〕

According to the present invention, by elastically deforming the claws of the brush holder, the brush holder can be attached to and detached from the mount of the wiring flock assembly by moving the motor in the axial direction, so carbon can be replaced by removing one side of the case. It becomes possible.

Furthermore, according to the present invention, since there is no wiring work using lead wires, incorrect wiring can be eliminated and the phenomenon of lead wires getting caught can be eliminated.

Further, according to the present invention, since the spring post I- can be provided on one side of the wiring block assembly, an assembly check can be easily performed visually.

Further, according to the present invention, the electrical connection between the forward/reverse switching device and the wiring block assembly can be ensured by providing a terminal cover.

Furthermore, according to the present invention, the wiring block assembly and the power supply wiring block assembly can be reliably electrically connected by providing a bridge assembly.

Further, according to the present invention, the switch can be easily positioned and fixed on the board by providing a hole in the board into which the head of the set screw for fixing the power cord 1- of the switch is inserted.

Furthermore, according to the present invention, a choke coil can be mounted on the surface of the plays 1 to 1 of the wiring block assembly and connected to the wiring pattern, making it possible to provide an electric tool with reduced electrical noise.

[Brief explanation of the drawing]

1 to 20 show embodiments of the present invention.
The figure is a side view, Figure 2 is a perspective view showing the assembly relationship of wiring components, Figure 3 is a top plan view of the wiring block device, Figure 4 is a front view of Figure 3, and Figure 5 is the same as Figure 4. A top plan view, FIG. 6 is a perspective view of the mount part of the wiring block device, FIG. 7 is a view of FIG. Figure 4 is a cross-sectional view taken along the line I-I, Figure 10 is a cross-sectional view when a choke coil is attached to Figure 9, and Figure 11 is a partial cross-sectional front view of a wiring block device equipped with a forward/reverse switching device. Fig. 12 is a front view of the terminal cover, Fig. 13 is a front view of the terminal cover.
The figure is a sectional view taken along line I-1 in FIG. 12, FIG. 14 is a front view of the power supply wiring block device, and FIG. 15 is a view taken along arrow B in FIG. 14.
FIG. 16 is a view taken along arrow B in FIG. 14, showing the assembled state. 17 is a plan view of the bridge device, FIG. 18 is a sectional view taken along the line nn in FIG. 17, FIG. 19 is a sectional view taken along the mm line in FIG. It is a sectional view taken along the line IV. FIG. 21 is a plan view of a conventional power tool. In the figure, 10 is an electric drill, 17 is a motor 18 is a field winding, 22 is a commutator, 23 is an armature assembly, 2
4 is a wiring block assembly, 28 is a brush, 29 is a plate, 30 and 31 are mounts, 32 and 33
is a brush holder, 37 is a step, 41 and 42 are spring posts, 43 is a convex portion, 47 is a circuit pattern, 51 is a parallel terminal, 67 is a choke coil, 68 and 69 are deep holes, 70 is a conductor, 71 and 72 are Positioning holes 73 and 74 are shallow holes. Name of patent applicant Hitachi Koki Co., Ltd.) 21 Ward/

Claims (4)

[Claims] (1) A wiring block device for a motor used in a power tool, etc., wherein the motor has an armature assembly, the armature assembly includes a commutator, and a field for supplying a magnetic field to the armature assembly. a wiring block device for the motor including magnetic windings, a plate made of an insulating material having a central opening for accommodating the commutator, and a brush holder arranged to operate a brush with respect to the commutator;
A wiring block device for a power tool, which includes a mount that is placed oppositely for support and is characterized in that at least one of the surfaces forming the mount is stepped. (2) A wiring block device for a motor used in a power tool, etc., wherein the motor has an armature assembly, the armature assembly includes a commutator, and a field for supplying a magnetic field to the armature assembly. A wiring block device for the motor including magnetic windings is configured to arrange and support an insulating plate having a central opening for accommodating the commutator and a brush holder to operate the brush with respect to the commutator. A convex portion is provided on a wall constituting the mount opposite to the plate, the convex portion is located at a mirror surface of the opposite mount, and a spring post made of a cylinder is provided in the vicinity of the convex portion perpendicularly from the plate. Wiring block device for power tools. (3) A wiring block device for a motor used in a power tool, etc., wherein the motor has an armature assembly, the armature assembly includes a commutator, and a field for supplying a magnetic field to the armature assembly. The wiring block device of the motor includes a plate made of an insulating material having an opening for accommodating the commutator, and four plate-shaped conductors arranged to form a circuit pattern in the plate. A wiring block device for a power tool, characterized in that the ends of the books are arranged to protrude parallel to a surface extending perpendicularly from the plate surface at suitable intervals. (4) A wiring block device for a motor used in a power tool, etc., wherein the motor has an armature assembly, the armature assembly includes a commutator, and a field for supplying a magnetic field to the armature assembly. A wiring block device of the motor including windings is made of an insulating material plate having an opening for accommodating the commutator, and a part of the conductor arranged in the plate to form a circuit pattern is drilled from the outside. A wiring block device characterized by having a recessed part on the surface of the insulating plate to facilitate cutting by drilling. Furthermore, in order to connect the circuit pattern cut off by cutting the conductor with a choke coil in order to reduce electrical noise, recesses are made on both sides of the insulating plate covering the conductor so that a portion of the conductor is exposed. A wiring block device for a power tool, characterized in that a hole for inserting the tip of a choke coil into a conductor is provided so as to be located approximately at the center of the recess.