JPH0426407A - Flexible wheel device for cleaner - Google Patents

Abstract

PURPOSE:To obtain the flexible wheel device for the cleaner which makes the assembly workability satisfactory, absorbs surely a shock, prevents the generation of an abnormal sound and contributes to realization of a silent sound by simple constitution by providing a spring material made of a steel wire which is fixed to a wheel fitting body, and whose both end parts face a fitting hole, and also, which presses downward elastically both end parts of an axle of a wheel. CONSTITUTION:The assembly work of a flexible wheel device 6 is executed integrally in a state that both end parts 24, 24 of a spring material 12 made of a steel wire press and energize downward an axle by inserting the axle 11 pivoting freely rotatably on a wheel 9 into a bearing long groove 20 of a fitting hole 17 and providing the wheel 9 in the fitting hole 17 so as to be freely movable upward and downward, fitting the spring material 12 made of a steel wire into a fixing recessed part 22 and tightening and fixing a fixing screw 13 into a screw stop hole 23. Accordingly, the assembly workability is very satisfactory. Also, downward energizing force is applied stably to the wheel, and at the time of absorbing a shock, the wheel executes smoothly the vertical motion, and no abnormal sound is generated.

Description

[Detailed description of the invention] (b) Industrial application fields The present invention relates to a universal wheel device for a vacuum cleaner.

(B) Conventional technology Conventionally, in order to soften the impact when a vacuum cleaner crosses over an obstacle such as a threshold while running, for example,
A swivel wheel device as shown in Japanese Patent No. 0148 is known. As shown in FIG. 8, this device has a holding plate (31) on which a bearing part (30) is rotatably attached to a mounting shaft formed on the bottom of the main body, and the holding plate (31) A pair of holding shafts (32) (32) protrude from the side surfaces, and a wheel mounting plate (33) is fixed to the holding shafts (32) (32).
is rotatably attached to the holding plate (31), and a wheel (34) is attached to the wheel mounting plate (33) on the opposite side of the holding shaft (32).
is rotatably supported, and two compression coil springs (35) (35) are positioned between the holding shaft (32) and the wheel mounting portion to absorb shock.

However, in this conventional technology, compression coil springs (3
5) Two coil springs (35) are required, and when assembling, two coil springs (35) (35') must be inserted between the retaining plate (31) and the wheel mounting plate (33) at the same time. Assembly workability is poor, and in addition, the specified loads of the two coil springs (35) (35) vary widely, so when supporting the main body with these two coil springs (35) (35), it is difficult to unload the specified loads. The balance tends to cause looseness, and this looseness causes the retaining plate (31) and the wheel mounting plate (
33) They have the disadvantage that they rub against each other on the walls, making noise and not moving up and down smoothly.

(c) Problems to be Solved by the Invention The present invention has been made to solve the above-mentioned problems.It has a simple structure, improves assembly workability, and ensures shock absorption. The object of the present invention is to obtain a swivel wheel device for a vacuum cleaner that contributes to quietness by preventing the generation of noise.

(d) Means for Solving the Problems The flexible wheel device for a vacuum cleaner of the present invention includes a wheel mounting body rotatably attached to a mounting shaft formed downward on the bottom surface of the main body, A wheel is disposed in the mounting hole so as to be vertically movable so as to be supported from below, and is fixed to the wheel mounting body, with both ends facing the mounting hole and elastically pushing both end portions of the axle of the wheel downward. It is characterized by being made of a pressing steel wire spring material.

In addition, the flexible wheel device for a vacuum cleaner of the present invention includes a wheel mounting body rotatably attached to a mounting shaft formed downward on the bottom surface of the main body, and a wheel mounting body rotatably mounted on a mounting shaft formed downward on the bottom surface of the main body; The single wheel disposed is fixed to the wheel mounting body, both ends thereof face the mounting hole, supports the wheel with a loose fit, and is made of a steel wire spring material having elasticity in the vertical direction. There is.

(e) Effect With the above configuration, the flexible wheel device for a vacuum cleaner has a wheel disposed in the mounting hole of the wheel mounting body, and a steel wire spring material that biases the wheel downward is fixed to the wheel mounting body. It can be easily assembled by doing so.

Since the spring material is not a coil spring but is fixed to the wheel mounting body, there is no squeaking noise generated from the spring material itself, and furthermore, both ends of the spring material press the axle of the wheel. As a result, a biasing force in the r direction is stably applied to the wheels, and the wheels move up and down smoothly when absorbing shock, and no abnormal noise is generated.

Moreover, instead of the configuration in which the axle presses, the wheel is supported loosely at both ends of the spring material, so that the spring material also serves as the axle of the wheel.

(f) Example Embodiments of the present invention will be described below with reference to the drawings.

(1) is the main body of a vacuum cleaner with a built-in electric blower (2), and in front of the electric blower (2) is a dust collection chamber that removably houses a paper bag filter (3) for accumulating sucked in dust. There is (4). (5) is a pair of rear wheels rotatably attached to the rear side of the main body (1), and (6) is a flexible wheel device for a vacuum cleaner rotatably attached to the bottom surface (7) of the main body (1). Both of these make it easy to move the main body (1) of the vacuum cleaner while in use.

As shown in FIG. 1, the swivel wheel device (6) includes a single wheel mounting body (8), a wheel (9), and an axle hole (lO) of the wheel (9).
It is composed of a wheel (11) that is loosely fitted to rotatably support the wheel (9), an elastic steel wire spring member (12), and a fixing screw (13).

The wheel mounting body (8) has a disk shape as a whole, and a mounting tube portion (14) formed in the center portion is formed to protrude downward from the bottom surface (7) of the main body (1). Axis (
15), and is prevented from being pulled out by a pawl (16) formed at the tip of the attachment shaft (15), so that the rotation of the attachment shaft (15) with respect to the main body (1) is prevented. It can be rotatably attached to.

A mounting hole (17) for arranging the wheel (9) is provided on the rear side of the wheel mounting body (8) with respect to the mounting shaft (15). ) is recessed along the axial direction. The mounting hole (17) is connected to the single wheel mounting body (8).
Notch 1: I (18
) and a pair of left and right side walls (19) (19) formed inside with a small gap from the opening edge of the notch (18).
), and long bearing grooves (20) (20) are formed in the left and right side walls (19) (19) to support the axle (11) movably in the vertical direction. Accordingly, the axle (11) is supported from below by the opening edge of the notch (18) and is pivotally controlled so as to be vertically movable. A recess (22) for fixing the spring material (12) is provided on the upper surface of a rib (21) formed on the side surface of the wheel mounting body (8) in front of the mounting shaft (15). ...and there is a screw hole (23) located near this recess (22).

The steel wire spring material (12) is made of a steel wire [
For example, it is formed by bending 5WP-B (class 8 piano wire) into a U-shape. Then, the steel wire spring material (12) is fitted into the fixing recess (22) with both ends (24) (24) facing the mounting hole (17), and the fixing screw ( 13) into the screw fixing hole (23), the head (13a) of the screw (13) presses the steel wire spring member (12) into the fixing recess (22)... As a result, the steel wire spring material (12) is attached to the wheel mounting body (
8) is fixed around the mounting shaft (15), and
Both end portions (24) (24) abut against both end portions (lla) (lla) of the axle (11) and press downward, causing the wheel (9) disposed in the mounting hole (17) to move downward. energize.

The assembly work of the swivel wheel device (6) involves inserting the axle (11) on which the wheel (9) is rotatably supported into the long bearing groove (20) of the mounting hole (17), and then attaching the wheel (9) to the mounting hole. (17)
By fitting the steel wire spring material (12) into the fixing recess (22) and tightening the fixing screw (13) into the screw retaining hole (23), , both ends (24) (24) of this steel wire spring material (12) are connected to the axle (
11) is pressed and biased downward, and this swivel wheel device (6) is fitted and attached to the mounting shaft (15), and at this time, the steel wire spring member (12
) is one piece, and the assembly is done by stacking each part, and the wheel ( 9) can be installed at the same time. Therefore, the assembly workability is very good.

Furthermore, since the steel wire spring material (12) is bent by utilizing the elasticity of the steel wire, the spring material (12) itself does not generate a squeaking sound unlike a conventional coil spring. Since both ends (24) (24) of the spring material (12) press and urge both end portions (11a) (11a) of the axle (11) downward with the same urging force, the wheels (9) are forced downward. The biasing force is applied stably, and even if an impact force is applied when the main body (1) is running, the wheels (9) move up and down smoothly to ensure impact absorption, and no abnormal noise is generated. , cleaning noise, especially on wooden floors, is significantly reduced.

Next, FIGS. 5 to 7 show another embodiment of a vacuum cleaner vacuum wheel device (25) corresponding to claim 2, and in the same figure, a device similar to the above-mentioned free wheel device (6) is shown. The same number will be assigned and the explanation will be omitted.

(26) is an elastic steel wire spring material;
6) bends both ends (27) and (27) in opposite directions, and inserts the both ends (27 and 27) into the shaft hole (10) of the wheel (9) from both sides to allow play. By fitting and supporting the shaft, both ends (27) (27) can also serve as an axle. With this configuration, the number of parts used can be further reduced compared to the above-mentioned swivel wheel device (6), and the assembly is simple, making the assembly process even more efficient.

(G) Effects of the Invention The flexible wheel device for a vacuum cleaner of the present invention is constructed as described above, and according to the structure of claim 1, the wheel is disposed in the mounting hole of the wheel mounting body, and the wheel is mounted downward. Easy to assemble by fixing the biasing steel wire spring material to the wheel mounting body.
Assembling workability is improved. In addition, there is little squeaking noise from the spring material, and since the spring material stably applies a downward biasing force to the wheel, the wheel moves up and down smoothly and absorbs shock reliably. It generates less noise and therefore contributes to quieter cleaning, including cleaning of wooden floors and the like. Furthermore, according to the structure of claim 2, in addition to the effects of the above-described 1n claim 1, the structure is further simplified and the assembly workability is improved.

[Brief explanation of drawings]

Figures 1 to 4 all relate to an embodiment of the flexible wheel device for a vacuum cleaner of the present invention, with Figure 1 being an exploded perspective view, Figure 2 being a cross-sectional view of the main parts when the vacuum cleaner is assembled, and Figure 3 being an exploded perspective view. Figure 4 is a side view of the vacuum cleaner, and Figures 5 to 7 are
The figures relate to other embodiments, and FIG. 5 is an exploded perspective view, FIG. FIG. 2 is an exploded perspective view of the prior art. (6) (25)...Swivel wheel device for vacuum cleaner, (8).
...Wheel mounting body, (12) (26)...Steel wire spring material.

Claims (2)

[Claims] (1) A wheel mounting body rotatably attached to a mounting shaft formed downward on the bottom of the main body, and a wheel mounting body disposed in a mounting hole of the wheel mounting body so as to be vertically movable so as to be supported from below. A swivel for a vacuum cleaner, characterized in that the wheel is fixed to the wheel mounting body, and is made of a steel wire spring member with both ends facing the mounting hole and elastically pressing both end portions of the axle of the wheel downward. Wheel device. (2) A wheel mounting body rotatably attached to a mounting shaft formed downward on the bottom of the main body, a wheel disposed in a mounting hole of the wheel mounting body so as to be movable up and down, and the wheel mounting body A flexible wheel device for a vacuum cleaner, characterized in that the wheel device is fixed to the mounting hole, has both ends facing the mounting hole, supports the wheel with a loose fit, and is made of a steel wire spring material having elasticity in the vertical direction.