JPH04329918A - Electric vacuum cleaner - Google Patents

Abstract

PURPOSE:To relieve a shock on striking of an auxiliary wheel at steps and easily erect the cleaner body and fall it also by attaching an auxiliary wheel protruded to a diagonal direction against the bottom and the rear face of the cleaner body for transferring, to the protruding direction from the cleaner body. CONSTITUTION:When rear travelling wheels 10 go over a step on pulling an electric vacuum cleaner body 1, an auxiliary wheel 11 contacts the upper face of the step. In this time, since the auxiliary wheel 11 can be protruded and transferred and elastically supported by a coil spring 30, shocks acted on the cleaner body 1 can be relieved. On containing, the cleaner body 1 is turned from the horizontal position to the erected posture, and on using, it is turned from the erected position to the horizontal posture. In this time, the auxiliary wheel 11 contacts the floor level and the weight of the cleaner body 1 is added and then the auxiliary wheel 11 is drawn into time cleaner body 1 against the elasticity of the spring 30, and hence, the cleaner body 1 can easily be erected and also laid on its side.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner in which auxiliary wheels are provided at the intersection of the bottom and rear surfaces of the vacuum cleaner body.

0003

2. Description of the Related Art In a vacuum cleaner, running wheels are rotatably provided at the front and rear parts of the vacuum cleaner body and protrude from the bottom surface of the vacuum cleaner body, respectively, so that the wheels can run on the floor.

[0004] Furthermore, there is a vacuum cleaner in which an auxiliary wheel is rotatably provided at the intersection of the bottom surface and the rear surface of the vacuum cleaner body.

[0005] In this vacuum cleaner, when the main body of the vacuum cleaner is moved to get over a step such as a threshold, the auxiliary wheels prevent the rear part of the main body of the vacuum cleaner from coming into contact with the step and getting caught, allowing the user to get over the step smoothly. This is done to improve drivability.

Furthermore, when the vacuum cleaner is not in use, it is stored in an upright position with the rear surface of the vacuum cleaner body on the floor in order to reduce the storage space. At this time, the main body of the vacuum cleaner is moved from a horizontal position to a standing position, or from a standing position to a horizontal position during use, and the auxiliary wheels are used to smoothly perform the transition.

[0007]

[Problems to be Solved by the Invention] However, in conventional vacuum cleaners, the position of the auxiliary wheels is fixed with respect to the main body of the vacuum cleaner. Therefore, when climbing over a step, the auxiliary wheels hit the step, applying an impact to the vacuum cleaner itself, and generating a loud impact noise.

[0008]Also, when the vacuum cleaner body moves from a horizontal position to a standing position or from a standing position to a horizontal position, the rotation of the auxiliary wheels makes it smoother, but the auxiliary wheels protrude. Because of this, it is somewhat difficult to stand up or knock down.

The present invention has been made in view of the above-mentioned problems, and is capable of alleviating the impact when climbing over a step, and of reducing the impact when the main body of the vacuum cleaner moves from a horizontal position to a standing position or from a standing position. It is an object of the present invention to provide a vacuum cleaner that can easily shift to a horizontal position.

[Configuration of the invention]

[0011]

[Means for Solving the Problems] The present invention provides running wheels protruding from the bottom surface of the vacuum cleaner body at the front and rear portions of the vacuum cleaner body, respectively, and at the intersection of the bottom surface and the rear surface of the vacuum cleaner body. In a vacuum cleaner provided with an auxiliary wheel, the auxiliary wheel is provided on the vacuum cleaner body so as to be movable in and out of the vacuum cleaner body in a diagonal direction with respect to the bottom and rear surface of the vacuum cleaner body, and the auxiliary wheel protrudes from the vacuum cleaner body. It is provided with an elastic body that urges the user in the direction.

0012

[Operation] In the present invention, the main body of the vacuum cleaner is run with the front and rear running wheels in contact with the floor surface. When getting over a step such as a threshold, when the rear running wheels get over the step, the auxiliary wheels hit the top surface of the step. At this time, since the auxiliary wheels can move in and out and are supported elastically, the impact applied to the cleaner body is alleviated.

[0013] Furthermore, when storing the vacuum cleaner, in order to reduce the storage space, the vacuum cleaner main body can be stored in an upright position with the rear surface touching the floor. Therefore, when storing, the main body of the vacuum cleaner rotates from a horizontal position to an upright position.
When in use, it rotates from a standing position to a horizontal position. At this time, the rotatable auxiliary wheels touch the floor,
Smooth posture rotation transition. Moreover, when the auxiliary wheels touch the floor and the weight of the vacuum cleaner body is applied, the auxiliary wheels retract into the vacuum cleaner body against elasticity, making it easy to lean the vacuum cleaner body up or fall down.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a vacuum cleaner body, which is composed of an upper case 2, a lower case 3, and a lid 4 provided on the front upper surface of the upper case 2 so as to be openable and closable. This vacuum cleaner body 1 is provided with a dust collection chamber 5 on the front side inside.
An electric blower 6 whose suction side communicates with the dust collection chamber 5 is built into the rear side of the interior, and an exhaust port (not shown) communicating with the exhaust side of the electric blower 6 is formed at the rear side. Further, the lid body 4 is provided with a suction port 8 into which a hose insertion pipe 7 is inserted and connected, and this suction port 8 is communicated with the dust collection chamber 5 . The center of gravity of this vacuum cleaner body 1 is located at position G in the figure.

Bottom surface 1a in front of center of gravity G of vacuum cleaner body 1
is provided with a rotatable running wheel 9, and large-diameter running wheels 10 are rotatably provided on both sides behind the center of gravity G.

Furthermore, the bottom surface 1a and the rear surface 1b of the vacuum cleaner main body 1
Auxiliary wheels 11 are provided near the intersection on both the left and right sides. As shown in FIGS. 2 and 3, the auxiliary wheel 11 is composed of a wheel portion 12 and a shaft portion 13 protruding from the center of both sides of the wheel portion 12.

The vacuum cleaner main body 1 is also provided with a wheel support portion 21 that supports the auxiliary wheels 11 so as to be movable in an oblique direction with respect to the bottom surface 1a and the rear surface 1b of the vacuum cleaner main body 1. This wheel support part 21 is formed with a guide frame part 23 having an opening 22 that penetrates the inner and outer surfaces of the lower case 3 and in which the auxiliary wheel 11 is movably arranged. Guide grooves 25 are formed into which the shaft portions 13 on both sides of the auxiliary wheel 11 are slidably fitted. A stopper portion 26a is formed at the outer end of the guide groove 25 to restrict movement of the shaft portion 13. A frame portion 27 having a recess 26 communicating with the guide groove 25 on the outside of each wall portion 24
A boss 29 having a mounting hole 28 is formed on the outside of each frame portion 27 .

Further, a coil spring 30 as an elastic body is inserted into the recess 26 of each frame 27 and biases the auxiliary wheel 11 in the projecting direction via the shaft 13 of the auxiliary wheel 11 disposed within the guide frame 23. be done.

Furthermore, a cover 31 is attached to the inner end portions of the guide frame portion 23 and the frame portion 27. This cover 31
This is composed of a semicircular frame-shaped cover portion 32 and mounting pieces 33 that protrude from both sides of the cover portion 32 and are joined to the frame portion 27. The mounting piece 33 has a protrusion 34 that fits inside the end of the coil spring 30, and a through hole 36 through which a screw 35 screwed into the mounting hole 28 is inserted. .

Next, the operation of this embodiment will be explained.

First, in order to assemble the auxiliary wheel 11 to the vacuum cleaner main body 1, the wheel portion 12 of the auxiliary wheel 11 is inserted into the guide frame portion 23 from inside the lower case 3, and the shaft portion 13 is inserted into the guide frame portion 23.
into the guide groove 26.

Next, after inserting the coil spring 30 into the recess 26 of the frame 27, the guide frame 23 and the frame 2
Connect the cover 31 to the inner end of the cover 3 and attach the screw 35 to the inner end of the cover 3.
screwed into the mounting hole 28 of the boss 29 through the through hole 36 of 1;
Tighten and fix the cover 31.

When the auxiliary wheel 11 is assembled, one end of the coil spring 30 in the frame 27 abuts against the shaft 13, and the other end abuts against the mounting piece 33 of the cover 31 so that the protrusion 3
It fits on the outside of 4. Therefore, the shaft portion 13 pressed by the elasticity of the coil spring 30 is in contact with the stopper portion 26a of the guide groove 25, and the wheel portion 12 is in contact with the stopper portion 26a of the guide groove 25.
is in the state of being most protruded from the lower case 3.

During cleaning, as shown in FIG.
The vacuum cleaner main body 1 can be moved in a horizontal position with its wheels 9 and 10 rolling on a floor surface 41.

Further, as shown in FIG. 4, when the main body 1 of the vacuum cleaner is run to get over a step 42 such as a threshold, when the rear running wheels 10 get over the step 42, the auxiliary wheels 11 move over the step 42. This corresponds to the upper surface of the stepped portion 42. At this time, since the auxiliary wheels 11 can move in and out and are elastically supported by the coil springs 30, the impact applied to the cleaner body 1 can be alleviated, and impact noise can be reduced.

Furthermore, when storing the vacuum cleaner main body 1, in order to reduce the storage space, the vacuum cleaner main body 1 can be stored in an upright position with the rear surface 1b touching the floor surface 41, as shown in FIG. Therefore, when stored, the cleaner main body 1 is rotated from a horizontal position to a standing position, and when used, it is rotated from a standing position to a horizontal position.

At this time, since the rotatable auxiliary wheels 11 are in contact with the floor surface 41, the rotational transition of posture can be performed smoothly. Moreover, when the auxiliary wheels 11 touch the floor surface 41 and the weight of the vacuum cleaner body 1 is added, the auxiliary wheels 11 pull into the vacuum cleaner body 1 against the elasticity of the coil spring 30. It is easy to stand up and also easy to knock down.

[0029]

According to the present invention, the auxiliary wheels are provided so as to be movable in diagonal directions with respect to the bottom and rear surfaces of the vacuum cleaner body, and the auxiliary wheels are biased in the direction of protruding from the vacuum cleaner body. When the vacuum cleaner main body is run to get over a step such as a threshold, the impact applied to the vacuum cleaner main body when the auxiliary wheels hit the top surface of the step can be alleviated, and impact noise can be reduced. Moreover, when storing the vacuum cleaner body in an upright position, the vacuum cleaner body rotates from a horizontal position to a standing position when stored, and from a standing position to a horizontal position when in use. When the auxiliary wheels touch the floor and the weight of the vacuum cleaner body is applied, the auxiliary wheels retract into the vacuum cleaner body against elasticity, making it easier to lean or tip the vacuum cleaner body.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of a vacuum cleaner of the present invention.

FIG. 2 is a partially exploded perspective view.

FIG. 3 is a partial cross-sectional view.

FIG. 4 is an explanatory diagram showing the running state of the cleaner body.

FIG. 5 is an explanatory diagram showing a stored state of the vacuum cleaner main body.

[Explanation of symbols]

1 Vacuum cleaner body 9,10 Running wheels 11 Auxiliary wheels 30 Elastic body

Claims (1)

[Claims] Claim 1: A vacuum cleaner that is provided with running wheels protruding from the bottom surface of the vacuum cleaner body at the front and rear parts of the vacuum cleaner body, respectively, and auxiliary wheels are provided at the intersection of the bottom surface and the rear surface of the vacuum cleaner body. In the vacuum cleaner main body, the auxiliary wheel is provided so as to be movable in a diagonal direction with respect to the bottom and rear surface of the vacuum cleaner main body, and an elastic body is provided to bias the auxiliary wheel in a direction to protrude from the vacuum cleaner main body. An electric vacuum cleaner characterized by: