JPS6336277B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a one-tub type dehydrating washing machine, and particularly to an agitation blade for a washing machine suitable for a washing machine using hot water.

[Prior art]

In Western countries, it is common to use boiling water to remove dirt better when washing clothes, and even in Japan, foreign-made washing machines that can use boiling water are popular at coin laundry stores and other places. There is. For these reasons, it is natural that a washing machine with hot water resistance specifications that takes into consideration the use of hot water is required. Conventionally, the stirring blades of stirring-type washing machines are made of synthetic resin, so a metal fitting is insert-molded in a part of the bearing part, which connects to the blade drive shaft, and has a structure that can withstand a large amount of transmitted torque. However, when using boiling water, if the synthetic resin bearing softens, there is a problem in that it will cause looseness between the stirring blade bearing and the blade drive shaft because the fitting metal fitting only supports it at one point. It was hot. To solve this problem, there is a method of making the entire bearing part metal, but in this case, it is difficult to manufacture a fitting metal fitting, which poses a problem in terms of cost.

[Purpose of the invention]

The purpose of the present invention is to solve the above-mentioned problems,
Even when using boiling water, the synthetic resin stirring blades
To provide a washing machine which has a sufficiently durable structure, is inexpensive and easy to assemble.

[Summary of the invention]

The present invention consists of a bottomed cylindrical outer tank, a basket rotatably placed in the outer tank, a short-period automatic reversing stirring blade installed approximately in the center of the basket, and a stirring blade installed below the outer tank. In a single-tank dehydrating washing machine, in which a stirring blade is attached to the blade drive shaft of the driving device, a hollow cylinder extending upward is formed in the center of the stirring blade, and a hollow cylinder is formed in the center of the lower part of the stirring blade. A boss is formed, the stirring blade is made of plastic, a vertical shaft insertion hole is formed in the center of the boss, and a mating boss to be inserted into the boss is formed of metal and located at the innermost part of the shaft insertion hole. A shaft insertion hole is also provided in the fitting boss, a spline is formed in the shaft insertion hole of this fitting boss, and a metal washer is integrally provided at the lower end of the boss, and the shaft insertion hole is also provided in this washer. A screw hole is formed in the center of the upper part of the boss, and this screw hole is formed so that the shaft insertion hole communicates with the inside of the cylinder. A spline shaft to be fitted is formed, this spline shaft has a smaller diameter than the blade drive shaft, a step is formed at the base of the spline shaft, and the washer is inserted into the step by fitting the shaft insertion hole into the spline shaft. At the same time, the upper side of the spline shaft is spline-coupled with the spline of the mating boss, and the blade fixing screw, which is inserted from the inside of the cylinder through the threaded hole, is screwed into the screw hole formed at the center of the upper end of the spline shaft to stir. The feature is that the blade is fastened to the blade drive shaft.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.
In Fig. 1, an outer frame 1, an outer tank 3 which is supported in vibration isolation through a hanging rod 2 within this outer frame 1, a basket (inner tank) 4 rotatably disposed within this outer tank 3, and this basket. A stirring blade (large diameter blade with cylinder) 5 rotatably attached to the bottom of the basket 4, a motor 6 of a drive device that rotates the stirring blade 5 and the basket 4, a clutch 7, etc., and a water supply device that supplies water into the basket 4. (not shown), and a drainage device (not shown) for draining water in the outer tank 3. During washing and rinsing, the water stored in the basket 4 is stirred by a stirring blade 5 that automatically reverses itself in short periods, thereby carrying out the washing work. In addition, during dewatering, the basket 4 and the stirring blade 5 are rotated at high speed, and the water drainage device is operated to drain the water in the basket 4 to the outside of the outer frame 1 through the outer tank 3, thereby completing the dewatering work. Execute.

In addition, in FIG. 2, the stirring blade 5 is a large diameter blade 5.
It is made of synthetic resin and is integrally formed from a tube 5b, a cylinder 5b, and a boss 5c, and a metal fitting boss 8 is inserted into the upper part of the boss 5c, and a washer 9 is outsert into the lower end surface. ing. This washer 9 also serves as a washer for stabilizing the attachment of the stirring blade 5. The blade drive shaft 10 to which the stirring blade 5 is attached is
It has a stepped shape with a small diameter spline shaft 10a formed at the tip. The stirring blade 5 is attached to the spline shaft 1
0a and the bearing part of the boss 5c of the stirring blade 5 (including the fitting boss 8) are spline-fitted, and the bottom surface of the washer 9 is in contact with the stepped part of the blade drive shaft 10,
It is fixed to the blade drive shaft 10 by a blade fixing screw 11. At this time, the stirring blade 5 is fitted to the blade drive shaft 10 by the fitting boss 8 of the boss 5c portion and the metal pieces above and below the washer 9, so that it can be firmly attached. In addition, even if the boss 5c made of synthetic resin softens when hot water is used, the fitting boss 8 and the boss 5
Due to the two-point support effect of the washer 9 outsert at the bottom of the boss 5c, there is no problem in fitting the bearing portion of the boss 5c and the blade drive shaft 10. Furthermore, since it can be used in common with the washer described above, there is no need to insert a washer, and since it is an outsert, there is no need to press fit a washer.

A cylinder cap 12 made of synthetic resin is attached to the upper end surface of the cylinder 5b of the stirring blade 5. The cylinder cap 12 has a protrusion 12a formed around the entire circumference at the lower end, and a stopper 12b and an air vent hole 12c at the middle. Also, stopper 12
A plurality of slits 12d are provided on the lower end surface of b. On the inner diameter side of the upper end of the cylinder 5b of the stirring blade 5,
A fitting groove 13 corresponding to the protrusion 12a of the cylindrical cap 12 is formed, and the cylindrical cap 12 has the following features:
The fitting groove 13 and the protruding portion 12a fit into each other to be attached to the cylinder 5b. The strength of this fit allows it to withstand centrifugal force during dehydration, and is firmly secured so that customers cannot easily remove it. Also, the stopper 12b is connected to the cylinder 5b.
The diameter is the same as the top end of the container, and is intended to improve the appearance and performance of loading and unloading laundry. When removing the tube cap 12 during maintenance such as replacing the stirring blade 5, insert a flat head screwdriver or the like into the slit 12d and pull it out. slit 12d
Since it is provided on the lower end surface of the stopper 12b of the cylinder cap 12, it is not visible to the customer and improves the external design.

When the basket 4 is filled with water during washing and rinsing, the air pressure in the space formed by the stirring blade 5 and the tube cap 12 is reduced to prevent an adverse effect on the bearing part of the stirring blade 5, and to prevent the tube cap from being damaged. In order to prevent the tube cap 12 from coming off, there is an air vent hole 12 in the tube cap 12, which is located in a position where it will not come into contact with water even when it is full of water.
c.

FIG. 3 differs from the embodiment shown in FIG. 2 in that a metal cup washer 9' is provided. In the case shown in FIG. 2, the washer 9 is outsert, whereas in the case shown in FIG. 3, the cup washer 9' is not outsert, but is later press-fitted into the lower end of the boss 5c. In the configuration shown in Fig. 3, the second
The same effects as those shown in the figure can be expected.

FIG. 4 is an enlarged view of a main part of the stirring blade shown in FIG. 2. As shown in this figure, screw through hole 1
1' is provided at the top of the boss 5C. This screw hole 5C communicates with the inside of the cylinder 5b and also communicates with the shaft insertion hole of the fitting boss 8.

〔Effect of the invention〕

As described above, the present invention comprises a bottomed cylindrical outer tank, a basket rotatably placed in the outer tank, a short-period automatic reversal type stirring blade provided approximately in the center of the basket, and an outer tank. In a single-tank dehydrating washing machine, which is equipped with a drive device installed below the tank and has an agitation blade attached to the drive shaft of the drive device, a hollow cylinder extending upward is formed in the center of the agitation blade, and the stirring blade is A boss is formed at the bottom center of the blade,
This stirring blade is made of plastic, a vertical shaft insertion hole is formed in the center of the boss, a fitting boss to be inserted into the boss is formed of metal, and is located at the innermost part of the shaft insertion hole. A shaft insertion hole is also provided in the fitting boss, a spline is formed in the shaft insertion hole of this fitting boss, a metal washer is integrally provided at the lower end of the boss, and a shaft insertion hole is also formed in this washer, A screw hole is provided in the center of the top of the boss.
This threaded hole is formed so that the shaft insertion hole communicates with the inside of the cylinder, and a spline shaft that fits into the shaft insertion hole is formed on the tip side of the blade drive shaft, and this spline shaft is connected to the blade drive shaft. By forming a step at the base of the spline shaft with a diameter smaller than the diameter, and fitting the shaft insertion hole into the spline shaft, the washer comes into contact with the step and the upper side of the spline shaft is connected to the spline of the mating boss. The stirring blade is fastened to the blade drive shaft by screwing the blade fixing screw, which is inserted through the threaded hole from the inside of the cylinder into the screw hole formed at the center of the upper end of the spline shaft.

According to this configuration, the following advantages can be expected.

(1) The boss is equipped with a metal fitting boss and a washer.The washer is placed at the lower end of the boss, and the fitting boss is placed at a distance to the back of the shaft insertion hole. Therefore, even if the plastic boss softens due to the use of hot water, the stirring blade is securely fixed to the blade drive shaft with two-point support by the fitting boss and washer without wobbling. Since the fitting boss and washer are supported at two points with a wide distance between them, support with less vibration of the stirring blade can be obtained.

(2) Since the fitting boss is extended to the washer and the washer is not omitted, there are the following advantages. That is, if the fitting boss is configured to be long in the axial direction extending to the washer, the shaft insertion hole provided in the fitting boss will be long and the spline will also be long. This machining process is time-consuming. On the other hand, since the fitting boss and washer are made separate, the fitting boss is also relatively thin, and the spline can be easily formed by press working.

(3) A screw through hole is provided in the center of the upper part of the boss, and this screw through hole is formed so that the shaft insertion hole and the inside of the cylinder communicate with each other, so screw the blade fixing screw through from above the cylinder. After fitting into the hole, you can easily tighten the screw into the threaded hole of the spline shaft using a long screwdriver from above the tube.

(4) Since the stirring blade is of a short-period automatic reversal type, the blade drive shaft and the rotation stopper of the stirring blade must be strong. Since it is a spline connection between the spline of the fitting boss and the spline shaft, a firm rotation prevention can be obtained.

(5) The blade drive shaft forming the spline shaft is
It cannot be made too thick due to shaft seals, etc. In addition, the spline shaft, which has a smaller diameter than the blade drive shaft, must have a threaded hole in the center of the shaft for the blade fixing screw that tightly tightens the stirring blade. It is difficult to replace the spline shaft with a flat portion that can sufficiently prevent rotation due to the provision of a screw hole, so a spline must be used.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention;
2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a diagram of another embodiment corresponding to FIG. 2. FIG. 4 is an enlarged view of a main part of the stirring blade shown in FIG. 2. 5... Stirring blade, 5b... Cylinder, 5c... Boss,
8...Fitting boss, 9...Washer, 10...Blade drive shaft, 10a...Spline shaft, 12...Cylinder cap, 12a...Protrusion, 12b...Stopper,
12c...Air vent hole, 12d...Slit, 13
...Mating groove.

Claims (1)

[Scope of Claims] 1. A cylindrical outer tank with a bottom, a basket rotatably placed in the outer tank, and a short-period automatic reversal type stirring blade provided approximately in the center of the basket,
In a single-tank dehydrating washing machine that is equipped with a drive device installed below an outer tank and has an agitation blade attached to the blade drive shaft of the drive device, a hollow cylinder extending upward is formed in the center of the agitation blade, A boss is formed in the center of the lower part of the stirring blade, this stirring blade is made of plastic, a vertical shaft insertion hole is formed in the center of the boss, a mating boss to be inserted into the boss is formed of metal, and a shaft insertion hole is formed. The fitting boss is also provided with a shaft insertion hole, a spline is formed in the shaft insertion hole of the fitting boss, and a metal washer is integrally provided at the lower end of the boss. A shaft insertion hole is also formed in this washer, a screw through hole is provided in the center of the upper part of the boss, and this screw through hole is formed so that the shaft insertion hole and the inside of the cylinder communicate with each other. forms a spline shaft that fits into the shaft insertion hole, this spline shaft has a diameter smaller than the diameter of the blade drive shaft, forms a step at the root of the spline shaft, and fits the shaft insertion hole into the spline shaft. , the washer contacts the stepped part, and the upper side of the spline shaft is spline-coupled with the spline of the fitting boss, and a screw hole is formed at the center of the upper end of the spline shaft for the blade fixing screw to be inserted from inside the cylinder through the screw hole. A one-tub type dehydrating washing machine characterized by screwing the stirring blades onto the blade drive shaft.