JP3434767B2 - Waterproofing device for cable mounting part of vibration motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention keeps the inside of the case of a vibration motor, such as a shock device for promoting fluidization of powder particles stored in a switch case, hopper, etc. of a motor of a concrete vibrator, watertight. For the waterproof rubber to be attached to the receiving part for the cable insertion of the case, especially the cab tire of the switch case of the handheld concrete vibrator used for concrete placement in construction work, production of secondary concrete products, etc. It is suitable as a waterproof rubber for the cabtire cable attachment part that is attached to the cable receiving part.

[0002]

2. Description of the Related Art The case of a vibration motor impairs the operation of the equipment when the water penetrates into the case and the insulation is damaged.
Therefore, the cable insertion hole for introducing the cable into the case must be closed in a watertight manner. In particular, concrete vibrators are used in concrete pouring sites where there is a lot of water. Therefore, the switch case of the concrete vibrator must be kept watertight, and a waterproof rubber is attached to the insertion hole of the cabtire cable provided in the switch case to waterproof the switch case. Also, the concrete vibrator is used by connecting the cabtire cable connected to the power supply device to the switch case integrated with the vibrator main body, but the cabtire cable is connected to the switch case of the cabtire cable. The weight is concentrated and added. Therefore, the waterproof rubber is indispensable also for preventing disconnection of the connection portion of the cabtire cable with the switch case and prevention of disconnection of the cabtire cable.

The cable insertion part of the vibration motor case is
In order to correspond to the diameter of the hole for inserting the cable and the diameter of the cable, the waterproof rubber of each standard is used corresponding to each standard. Even in concrete vibrators,
It is necessary to use a cabtyre cable having a different outer diameter corresponding to the output of the concrete vibrator, and conventionally, a separate waterproof rubber is prepared and used for each outer diameter of the cabtire cable.

[0004]

Since the waterproof rubber of the cabtire cable connecting portion and the case of other electric equipment is a consumable item, if there are a plurality of waterproof rubber standards, not only will the manufacturing cost increase, but the manufacturer will always be required. It was necessary to stock waterproof rubbers of multiple standards, and inventory management was complicated. In addition, when the user places an order for replacement parts, the user may not know the standard of the waterproof rubber, which may affect the time and effort required for replacement.

Japanese Patent Application Laid-Open No. 9-1998 discloses a cable in which different sizes can be dealt with by a single standard of waterproof rubber.
The invention of 243832 has been proposed. This invention
By constructing both ends of the tubular waterproof rubber with a hard material and an intermediate part with a soft material, the intermediate part can be largely deformed.

According to the above invention, it is possible to use cables of different sizes with one standard waterproof rubber, but since the waterproof rubber is composed of two kinds of materials, it is difficult to manufacture and the cost is high. Become.

An object of the present invention is to make it possible to cope with cabtire cables of various outer diameters and other cables that are commonly used by a waterproof rubber of one standard, and to obtain a product which is easy to manufacture and has a low cost. It is a thing.

[0008]

SUMMARY OF THE INVENTION The present invention is a waterproof rubber mounted on a receiving portion for inserting a cable of a case of a vibration motor.
And a metal ring arranged on the outer end surface of this waterproof rubber
And a tightening screw that is screwed into the screw groove provided in the receiving portion.
The waterproof rubber has an annular groove on the outer wall.
By tightening the tightening screw,
The inner wall of the groove of the waterproof rubber
Make sure that the cable of the vibration motor is
It constitutes an attached waterproofing device. According to the invention of claim 2, the groove is provided at the central portion in the axial direction of the waterproof rubber. The invention of claim 3 is applied to a cabtire cable attachment portion of a switch case of a concrete vibrator.

The groove is for annularly bulging the inner wall toward the inner cavity at a fixed position. Since the amount of bulging is specified by the depth and width of the groove, a wide and deep groove is needed when the diameter difference of the cables to be handled is large, and a narrow and shallow groove is used when the cable diameter difference is small. Is enough. The cross-sectional shape of the groove is a V groove (triangular cross-section),
A U-shaped groove, a rectangular cross section, or the like can be appropriately selected.

[0010]

[Function] Attach the waterproof rubber to the cable receiving part of the case,
When the waterproof rubber is tightened with a tightening screw and axially compressed after the cable is inserted, the inner wall of the groove portion of the waterproof rubber bulges toward the inner cavity side to form an annular convex portion, and the waterproof rubber is pressed against the cable. That is, when a small-diameter cable is installed, the amount of swelling is increased by increasing the amount of compression, and when a large-diameter cable is installed, the amount of compression and swelling is reduced, whichever cable standard Also, the waterproof rubber is pressed. Furthermore, the presence of the groove allows the inner diameter of the waterproof rubber to be slightly enlarged, and a cable having an outer diameter slightly larger than the inner diameter of the waterproof rubber can be mounted. In this way, one standard waterproof rubber can be used for large and small cables. Since it can be obtained only by forming a groove in a normal rubber ring, it is easy to manufacture, and the above problem is solved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a groove 2 having a V-shaped cross section is formed on a peripheral wall of a cylindrical waterproof rubber 1 having an inner cavity 3 in the axial direction.
Are provided in an annular shape to form the waterproof rubber of the present invention.
As shown in FIG. 2, when this waterproof rubber is compressed in the axial direction, it bulges toward the inner cavity 3 side in the groove 2 portion, and an annular ridge 4 is obtained. The ridge 4 is pressed against the peripheral wall of the cabtire cable 5 to provide a waterproof effect.

FIG. 3 shows a state in which the concrete vibrator is incorporated in the switch case 6. The waterproof rubber 1 is attached to a cylindrical receiving portion 6a formed in the switch case 6, and the cabtire cable 5 is inserted into the inner cavity 3 of the waterproof rubber 1. A metal ring 7 is arranged on the outer end surface of the waterproof rubber 1, and a tightening screw 8 is screwed into a screw groove 9 provided in the receiving portion 6a.

When the tightening screw 8 is tightened, the waterproof rubber 1
Is compressed in its axial direction, and the groove 2 part bulges toward the lumen side,
The ridge 4 is obtained. The convex line 4 is large if the amount of compression of the waterproof rubber is large, and small if the amount of compression is small. Therefore, by selecting the compression amount of the waterproof rubber 1 according to the size of the outer diameter of the cabtire cable 5, it is possible to press-contact the cabtire cables having different outer diameters.

It is also possible to insert a cabtire cable 5 having an outer diameter slightly larger than the inner diameter thereof into the waterproof rubber 1. That is, since the waterproof rubber 1 has the groove 2, the meat of the waterproof rubber 1 can escape to the groove 2. Further, since the groove 2 portion is thin, the inner diameter can be increased. Therefore, when trying to insert a cabtire cable that is thicker than the inner diameter of the waterproof rubber, the flesh at both ends of the waterproof rubber 1 escapes to the groove 2 portion, and the groove 2 apparently becomes small,
Moreover, the flesh of the groove portion extends and the inner diameter increases. Therefore,
A cabtire cable slightly thicker than the inner diameter of the waterproof rubber 1 can also be inserted, and the receiving portion 6a of the switch case 6 is kept watertight.

The waterproof rubber 1 has a thickness of 4 mm and a length of 16
If the diameter is about 15 mm, the groove width is about 6 mm, and the groove depth is about 2 mm, a cabtire cable having an outer diameter of about 12 mm to 15.5 mm can be supported and can be kept watertight.

[0016]

According to the present invention, since the groove is formed in the waterproof rubber in an annular shape, the waterproof rubber is compressed to bulge the groove portion toward the inner cavity side, so that the thin cable and the thick cable can be pressure-contacted. It can be kept watertight. As a result, the waterproof rubber of one standard can be applied to the cables of a plurality of standards, and the effects of maintaining the watertightness and preventing the removal can be obtained. Therefore, the trouble of inventory management is eliminated and the assembling workability is also improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view of the same compressed state

FIG. 3 is a cross-sectional view of the usage state

[Explanation of symbols]

1 Waterproof ring 2 grooves 3 lumen 4 convex stripes 5 cabtire cable 6 switch case 6a Receiver 7 metal ring 8 Tightening screw 9 screw groove

Claims (3)

(57) [Claims] 1. A waterproof rubber attached to a receiving portion for inserting a cable of a case of a vibration motor, and an outer end of the waterproof rubber.
The metal ring disposed on the surface and the receiving portion
The waterproof rubber has an annular groove on the outer wall, and the waterproof rubber is axially compressed by tightening the tightening screw.
The inner wall of the groove of the waterproof rubber bulges toward the inner side
Of the vibration motor cable mounting part 2. The waterproof device for a cable mounting portion of a vibration motor according to claim 1, wherein the groove is provided at a central portion of the waterproof rubber in the axial direction. 3. The cable mounting part waterproof device for a vibration motor according to claim 1, wherein the case is a switch case of a concrete vibrator.