JPH0236256B2 - DENKISOJIKI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of forming a tightening boss for fastening outer shell parts of a canister-type vacuum cleaner to each other using tapping screws or the like.

Conventional technology Conventionally, the main body of this type of vacuum cleaner is shown in Figs.
As shown in Fig. 7, the outer shell is composed of an upper body 1 divided into two parts, a lower body 2, a front lid 3, etc., which can be opened and closed from the front, and an electric blower 4 and a cord winder. Devices 5 and the like were sandwiched and built into the upper and lower bodies 1 and 2. The upper body 1 and the lower body 2 are usually connected by bosses 6-a to 6-b provided near the four corners of one of them, and a boss 7-a formed on the other opposite thereto. ~ 7-b was tightened with the tapping screw 8.

Problems to be Solved by the Invention However, the bosses 6-a and 6-b provided at the rear of the electric blower 4 and the cord attachment device 5 are not connected to the ribs 9 provided on the lower body 2 that support the rear of the electric blower 4. Since it is close to the rib 10 surrounding the cord winding device 5, it is formed in a very narrow place. Also, the height of the bosses 6-a and 6-b is increased,
Therefore, rib 10 and rib 11 are used to supplement the strength.
In the mold for resin injection molding the lower body 2, the core metal on the inner side becomes complicated, increasing the unit price of the parts, or during injection molding.
It becomes impossible to pass the water pipe that cools this core metal, and the molding itself becomes impossible, or even if molding is possible, the cooling becomes insufficient, and the boss A6-a, 6-b forming portion of the lower body 2 The problem has been that it becomes deformed and cannot be used.

The present invention solves these conventional drawbacks by forming the boss with a simple mold configuration, and also ensures reliable connection of the upper and lower bodies.

Means for Solving the Problems The technical means of the present invention for solving the above problems is to provide bosses for fastening the upper and lower bodies on the wall surface described below. In other words, a side core mold is used to form a boss that rotatably locks a pair of wheels attached to both sides of the lower body in order to easily move the body;
It is provided on the wall surface formed by both molds of the core mold for forming the inside of the lower body.

Effect This effect is as follows. In other words, since the main body fastening boss is provided on the wall formed by the side core mold and the core mold, the height of the boss is lowered, making it easier to form, and the core mold has a simple shape, so the mold Sufficient cooling can be performed, and resin injection molding of the lower body can be easily performed.

Embodiments Hereinafter, embodiments will be described based on the accompanying drawings. In Figs. 1 to 5, 21 is the lower body of the vacuum cleaner that has a built-in electric blower 22, cord winding device, etc. The electric blower 22 etc. are installed on the rear side, and the floor suction port is on the front side. - A paper bag 23 for storing dust sucked in through the hose/extension pipe is housed in each case.

Reference numeral 24 indicates a pair of rear wheels attached to both sides of the rear end of the lower body 21, and 25 indicates a flexible wheel device disposed on the front bottom surface of the lower body 21, both of which facilitate movement of the vacuum cleaner during use. It is.

26 is an upper body coupled to the rear upper part of the lower body 21, 27 is an upper lid rotatably fixed to the upper body 26, and 28 is a handle used when transporting the main body, which is rotatably attached to the upper lid 27. It is worn.

There is a vinyl chloride bumper 29 on the outer periphery of the main body.
This prevents the main unit and furniture from being damaged by hitting furniture when moving while using the vacuum cleaner.

Further, the upper body 26 has a chamber for accommodating a shelf suction port 30 and a gap suction port (not shown), which are covered with a storage lid 31 so as to be openable and closable.

A pair of tightening bosses 32 are provided at the rear corners of the lower body 21, and tapping screws 33 are tightened from the upper body 26 to connect the lower body 21 and the upper body 26 while sandwiching the bumper 29. Further, wheel mounting bosses 34 for rotatably holding the rear wheels 24 protrude horizontally from both rear sides of the lower body 21, and a recess 35 with a depth of about 30 mm extends from the bottom of the rear to the mounting surface of the bumper 29. ,36,37,
38 is formed. And the tightening boss 32
are formed on top wall 39 forming recess 38 .

Next, the mold configuration and forming method for the recesses 35 to 38 and the tightening boss 32 will be explained.

In order to resin injection mold the lower body 21, a cavity mold 40 disposed on both sides of the exterior, a core mold 41 disposed on the inside, and a wheel mounting boss 34 are used.
Three types of molds including a side core mold 42 are used to form the . As shown in FIG. 5, the cavity mold 40 is moved in the A direction, the core mold 41 is moved in the R direction, and the side core mold 42 is moved in the C direction after resin injection molding, and the lower body 21 is formed. 35 to 38 are side core molds 42 formed at the same time as the wheel attachment bosses 34. Also upper wall 3
9 is a side core type 42 and a core type 41,
Furthermore, the tightening bosses 32 are each formed by a core mold 41.

Note that the recesses 35 to 38 are formed by inserting the rear wheel 34 into the wheel mounting boss 34 and assembling the rear wheel 24 into the main body.
It is hidden inside and cannot be seen from outside the main unit.

Next, the operation in this configuration will be explained.

Since the tightening boss 32 can be provided on the upper wall 38 formed by the side core mold 42 and the core mold 41, the internal shape of the lower body 21 in the portion where the tightening boss 32 is provided is simple. Become. As a result, the shape of the core mold 41 becomes simple, which not only facilitates mold processing, but also allows the mold to be cooled in an ideal form during resin injection molding. Therefore, it becomes easy to separate the mold and the lower body 21 after molding, and the time from the start to the end of molding can be shortened, and the total cost can be reduced. Also, as a matter of course, since the shape of the core mold 41 in the vicinity of the tightening boss 32 is simplified, the molding quality of the lower body 21 is also improved.

Further, since the tightening boss 32 is not formed from the bottom surface of the lower body 21 but is provided on the upper wall 39, the tapping screw 32 is not formed on the bottom surface of the lower body 21 as in the conventional case.
There is no screw hole for tightening 3, and it does not make it look bad.

Effects of the Invention As described above, the present invention provides a tightening boss for tightening a tapping screw to connect an upper body and a lower body, and a core mold for forming the inside of the lower body.
By installing it on the wall formed by the side core mold that forms the wheel mounting boss, it ensures reliable resin injection molding of the lower body, and also has the effect of reducing the unit cost of parts. It is something that can be demonstrated.

[Brief explanation of drawings]

Fig. 1 is a sectional view of essential parts of a vacuum cleaner according to an embodiment of the present invention, Fig. 2 is an overall perspective view of the vacuum cleaner, Fig. 3 is a side view of the vacuum cleaner, and Fig. 4 is a perspective view of the lower main body of the vacuum cleaner. 5 is a cross-sectional view showing the structure of a mold when forming the tightening boss of the lower body, and FIG. 6 is an exploded perspective view of a conventional vacuum cleaner. 21...Lower body, 22...Electric blower, 26...
...Upper body, 32...Tightening boss, 34...Wheel mounting boss, 39...Wall surface (upper wall).

Claims (1)

[Claims] 1 The main body consists of an upper main body and a lower main body, each of which has a built-in dust collection chamber for accumulating dust in the front and a cord winding device, electric blower, etc. in the rear, and a screw is used to fasten the upper main body and the lower main body. The boss for tightening is formed on the lower body along with the wheel mounting boss, and the boss for tightening the same screw is formed on the wall surface formed by the side core mold that forms the wheel mounting boss and the core mold for forming the inside. A vacuum cleaner installed.