JP3032727B2 - Concrete vibrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand-held concrete vibrator, and has a feature in a motor insulation structure.

[0002]

2. Description of the Related Art Conventionally, as a motor used for this type of concrete vibrator, there is, for example, Japanese Utility Model Publication No. 60-207.
No. 53 has been proposed. As shown in FIG. 4, an insulating layer 33 is formed on the outer peripheral surface of the rotating shaft 32 of the motor 31, a laminated plate 34 is fixed to the rotating shaft 32 via the insulating layer 33, and the motor casing 35 is made of plastic. The field laminated board 36 is directly attached to the inside of the casing 35.

[0003]

Although the above-mentioned conventional insulated motor can attain an initial result for the purpose of insulation, the casing 35 must be made of an insulator such as plastic, and is made of metal. A sufficient insulating effect cannot be obtained in the casing. The handle 37
Also, it is made of plastic as an integral structure with the casing and forms a part of the insulating structure.

[0004] The working environment of a concrete vibrator is a civil engineering site, a building site, a concrete secondary product manufacturing factory, and the like, and the handling environment is severe, and the load on the motor is extremely large. For this reason, the following problems have occurred. (1) Plastic casings and handles are easily damaged. Since these components constitute a part of the insulating structure, if they are damaged, the insulation becomes insufficient and there is a risk of electric shock.In addition, if the casing is damaged, the support of the rotary shaft by the rotary shaft support frame integrated with the casing becomes impossible. Become stable,
There is a possibility of malfunction. (2) If the air cooling capacity of the motor is reduced due to adhesion of concrete during use, heat is generated inside the motor, and the plastic casing and the rotating shaft support frame are softened.
Normal rotation of the motor may not be obtained, which may lead to burnout of the motor. (3) The brush of the motor is attached to the casing. However, if the casing is softened, the support of the brush becomes unstable, and there is a possibility that the rotation of the motor may be defective or burnt out. (4) Since a large amount of concrete adheres to the casing due to the work, a tool such as a rag is used to peel off the concrete, but there is a possibility that the plastic casing or handle may be damaged in the concrete peeling work. (5) In order to reduce the transmission of the vibration of the concrete vibrator to the operator, it is preferable that the casing and the handle be heavy as long as there is no trouble in the operation. There is.

[0005] All of the above problems can be solved by making the casing and the handle made of metal. However, the above-mentioned conventional insulating structure is an essential component of the casing and the handle made of an insulator such as plastic. Therefore, simply replacing plastic with metal will result in an insufficient insulating function. Accordingly, an object of the present invention is to provide a concrete vibrator having a motor capable of obtaining greenness equivalent to that of the above-mentioned conventional technology while using a casing and a handle made of metal.

According to the present invention, in a concrete vibrator, an insulating layer is provided on an outer peripheral surface of a rotating shaft of a motor with a handle for driving a vibration shaft, and a laminated plate is fixed to the rotating shaft via the insulating layer. At the end of the casing or all
The body is made of metal, and a middle frame made of an insulator is fitted in a casing, and a field laminate of a motor is fixed inside the middle frame . And the tip side of the casing made of metal
Has a metal support frame that supports the rotating shaft of the motor.
Formed on the support frame via a bearing.
The concrete vibrator is constituted by supporting the base end . (Claim 1) The invention according to claim 2 is that the handle is hollow, an insulating frame formed of an insulating material is mounted in the hollow portion, and the switch body and the covered electric wire are disposed in the insulating frame. .

[0007]

According to the first aspect of the present invention, the laminated plate and the rotating shaft are insulated by the insulating layer, thereby preventing electric leakage from the laminated plate to the rotating shaft. Since the field laminated plate is fixed to the middle frame made of an insulator, the middle frame works as an insulating material instead of the conventional plastic casing, and an insulated motor can be obtained without using the casing as a component. In addition
And the whole or integral part of the casing
The supporting frame of the rotating shaft is made of metal,
The support frame is prevented from softening, and even if the motor is heated, the rotating shaft
And the brush are kept stable, so the motor rotation is uneasy
There is no constant. According to the second aspect of the present invention, the insulating frame mounted in the hollow portion of the handle prevents leakage from the switch or the covered electric wire, and enables double insulation of the handle without using the handle as a component. As a material of the metal casing, aluminum is preferable in terms of weight and cost, but other metals can be used.

[0008]

FIG. 2 shows the whole of a concrete vibrator according to the present invention.
Flexible shaft 3 is connected to rotating shaft 2 of
The vibration shaft 4 is connected to the tip of the flexible shaft 3. The vibrating shaft 4 is mounted in a cylindrical vibrating body 5, and the vibrating portion 5 vibrates due to the vibration of the vibrating shaft 4. The motor 1
The flexible shaft 3 and the flexible shaft 3 are detachable, and are fixed by the fixture 6.

The details of the motor 1 are as shown in FIG. A rotating shaft support frame 8 also made of aluminum is integrally formed at the base of the aluminum tip casing 7, and a bearing bracket 9 is attached to the tip of the tip casing 7. A bearing 10 is mounted on the rotary shaft support frame 8, and the rotary shaft 2 is supported by the bearing 10 and a bearing 11 mounted on the bearing bracket 9.

An insulating layer 12 is formed on the outer periphery of the rotating shaft 2, and a laminated plate 13 is fixed around the insulating layer 12, so that insulation between the laminated plate 13 and the rotating shaft 2 is achieved. ing. Further, a cylindrical middle frame 14 is provided in the distal end side casing 7.
Is fitted. This middle frame is formed of an insulator such as plastic, and a field laminated plate 15 is fixed inside the middle frame 14 so that insulation between the field laminated plate 15 and the distal end casing 7 is achieved. ing. In the drawing, reference numeral 17 denotes a carbon brush holder, which is fitted on the rotating shaft support frame 8.

A base casing 19 having a handle 18 is attached to the integrally formed distal casing 7 and the rotating shaft support frame 8, and together with the distal casing 7, constitutes a motor casing 16. The base casing 19 has a split structure in the direction of the rotation axis, and two members are connected so as to sandwich the rotation shaft support frame 8. A rubber insulating ring 20 is interposed between the base casing 19 and the distal casing 7, and a rubber insulating ring is provided between two members constituting the base casing 19 and the rotating shaft support frame 8. The portion 21 is interposed to provide insulation between the distal casing 7 and the rotating shaft support frame 8 and the base casing 19.

The handle 18 of the base casing 19 has a hollow portion 22 in which a plastic insulating frame 23 is mounted. The insulating frame 23 has a shape and a size that covers the connection terminal 25 of the switch 24 and the covered electric wire 26 disposed in the hollow portion 22, and has a rectangular cross section formed by combining two U-shaped cross sections ( FIG.
reference). By arranging the connection terminals 25 and the covered wires 26 in the insulating frame 23, insulation between the connection terminals and the covered wires of the switch and the base casing 19 having the handle 18 is achieved.

In the figure, reference numeral 27 denotes a filter, and 28 denotes an intake cover. The filter 27 is made of an insulator so as to insulate the rotary shaft support frame 8 and the base casing 19 from each other.

[0014]

According to the present invention, since the magnetic laminate is mounted on the middle frame made of insulator, the casing is made of metal.
In addition , it is possible to insulate the magnetic laminate from the casing tip. Therefore, if the casing base having the handle is made of an insulator such as plastic even if the casing tip side is made of metal, a concrete vibrator having a high insulation effect against electric leakage caused by poor insulation of the coil of the laminated plate can be obtained. . Also metal casing
Since the rotating shaft support frame made of metal is connected to the motor, the supporting frame is not softened by the heating of the motor, and the vibrator can be stably rotated even during the heating in addition to the insulating effect.

Further, when a switch terminal or a covered electric wire is arranged in a middle frame made of an insulator in a casing base having a handle as in the invention of claim 2, the covering of the covered electric wire is broken. However, insulation is maintained by the middle frame. Therefore, the casing base can be made of metal.

Therefore, according to the present invention, a part or all of the casing can be made of metal while maintaining an insulating effect comparable to that of a conventional plastic casing. Therefore, the following effects can be obtained. (1) The metal casing has no risk of damage, electric shock due to the damage of the casing can be prevented beforehand, and the metal support frame has high heat resistance. Support is stable, normal rotation is maintained, and there is no risk of motor damage. (2) In the work of peeling concrete adhered to the casing, if the casing is made of metal, there is no possibility that the casing will be damaged. (3) The weight is obtained by making the casing made of metal, and the transmission of the vibration of the concrete vibrator to the operator can be reduced. Further, since the insulating ring interposed between the distal end casing and the base casing also has a buffering effect, the transmission of vibration is further reduced. Therefore, it is possible to reduce obstacles to workers such as white wax.

[Brief description of the drawings]

FIG. 1 is an enlarged front view of a cross section of a motor unit according to an embodiment of the present invention.

FIG. 2 is a front view showing the whole.

FIG. 3 is an exploded perspective view of the insulating frame for grip insulation.

FIG. 4 is an enlarged front view in which a motor section in a conventional example is partially sectioned.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Rotating shaft 3 Flexible shaft 4 Vibrating shaft 5 Vibrating body 6 Fixture 7 Tip side casing 8 Rotating shaft support frame 9 Bearing bracket 10 Bearing 11 Bearing 12 Insulating layer 13 Laminated plate 14 Middle frame 15 Field laminated plate 16 Casing 17 Carbon brush holder 18 Handle 19 Base casing 20 Insulation ring 21 Insulation convex part 22 Hollow part 23 Insulation frame 24 Switch 25 Connection terminal 26 Insulated wire 27 Filter 28 Intake cover 31 Motor 32 Rotating shaft 33 Insulating layer 34 Laminated plate 35 Casing 36 Field Laminated board

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Hei 7-29199 (JP, U) Japanese Utility Model Hei 1-1171850 (JP, U) Japanese Utility Model Sho 60-20753 (JP, Y2) Japanese Utility Model Sho 57- 10204 (JP, Y2) Jiko 4-36039 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) E04G 21/08

Claims (2)

(57) [Claims] 1. A concrete vibrator having a vibrating shaft for vibrating a vibrating section and a motor with a handle for driving the vibrating shaft, wherein the motor has a casing made of metal on the tip side or the whole, An insulating layer is provided on the outer surface, a laminated plate is fixed to the rotating shaft via the insulating layer, and a middle frame made of an insulator is fitted in a casing of the motor, and the motor is provided inside the middle frame. A metal support frame for supporting a rotating shaft of a motor is integrally formed on the distal end side of the casing, and a base end of the rotating shaft is mounted on the supporting frame via a bearing. Concrete vibrator 2. The concrete vibrator according to claim 1, wherein the handle is hollow, and an insulating frame formed of an insulator is mounted in the hollow portion, and a connection terminal of the switch and a covered electric wire are arranged in the insulating frame.