JPS6387364A - Attitude controller of hand type cart for climbing on staircase - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a single-axis type (so-called cat cart) hand-pull cart, and particularly to the posture of the hand-push cart when climbing and descending stairs. This invention relates to a posture control device that maintains the posture optimally.

(Prior technology) i! ! When climbing or descending stairs with an object on it, considerable care is required to maintain the optimal posture, and this can be extremely troublesome for the operator, especially when transporting heavy objects. However, there is currently nothing that can easily solve this problem.

(Problem to be solved by the invention) As mentioned above, when climbing stairs with luggage etc. on a single-axis two-wheeled hand cart, when descending, if the car falls too far toward the nine-stair side, the first-stair corner is used. The cart may slip down due to contact with the cart body. Conversely, if the cart is raised too much, the weight of a single heavy object will be added to the front, making it difficult to hold it, and eventually the front of the cart will fall. There is a risk of falling.

This invention aims to solve the above-mentioned problems.

(Means and effects for solving the problems) The present invention has been made in view of the above problems, and includes means for sensing the posture of the cart body in a hand-pushed cart for transporting two heavy objects along stairs. It is provided on the cart body, and based on the information obtained by the sensing means, it emits a warning sound to the operator when a predetermined posture value is exceeded.
The cart body is equipped with a means to automatically stop when the upper limit of the predetermined posture value is exceeded, and when climbing or descending the 9 stairs, a buzzer warns the user of the dangerous posture of the push cart. When the upper limit of the posture is exceeded, an automatic stop function is activated to make it easier for the operator to maintain the optimum posture and to prevent the risk of falling.

(Example) Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a side view schematically showing the main parts of an embodiment of the present invention. Reference numeral 1 indicates a drive wheel for climbing and descending, and wheel holding frames 2 are attached to both ends of this drive shaft. A plurality of wheels 3 (four on one side in the figure) of the same diameter are provided on the wheel holding frame 2 to which the wheels 3 are fixed and are arranged equidistantly from the shaft 1 and at equal angular intervals. And the drive shaft 1 is the battery 4
It is drivingly connected via a speed reducer 6 to an electric motor 5 which is supplied with power through an electric circuit from the motor.

7 is the cart body, and on the top thereof is a grip 8 that maintains the cart's posture when it climbs or descends stairs.
A push button switch 9 is provided near the grip 8 to control the driving of the drive shaft 1 from ON to OFF. 10 is heavy object, 11 is band, H is stairs, I
, II, and Ill respectively indicate the positions when the cart is tilted at 01 degrees, 02 degrees, and 05 degrees with respect to the horizontal plane (see the dotted line and the two-dot chain line).

Reference numeral 13 denotes a storage box containing a posture sensor and a warning buzzer, and is provided on the top of the cart body 7. FIG. 2 shows a specific example of the alarm function device inside the storage box. In FIG. 1, 14 is a pendulum-type weight that swings in the direction of the arrow around a rotating fulcrum shaft 19. 18t and 18. 15 is a microswitch, 16 is a buzzer, and IT is a screw for operating the microswitch.

In this way, the pendulum weight 14 and the micro switch 15
In combination, the inclination angle θ (posture) of the cart 7 is sensed and the buzzer 16 is controlled.

As mentioned above, in the embodiment of this invention.

As shown in 13, the cart body is provided with a sensor function that senses the tilting angle (attitude of the cart body) with respect to the direction of gravity, and based on the information obtained by this sensor function, as shown in FIG.

When the predetermined attitude value is exceeded, that is, θ1 or less (
When the position is too low) or 02 to θ (too high), a buzzer will sound an alarm to the operator, and when the upper limit of the predetermined posture value is exceeded, such as 08 or higher.

As shown in FIG. 4, the operator presses the push button switch 9.
The drive operation can be automatically interrupted regardless of the operation.

Note that in the range of θ to θ2, both climbing and descending are possible, and no warning sound or automatic stop control is required.

The embodiment of this invention has the above-mentioned functions, so it is highly safe to climb.

A push cart is provided with a lowering motion.

(Effect of the invention) This invention is constructed as described above in detail.

When climbing or descending stairs with a hand-held cart, the tilt angle of the cart is automatically sensed to determine whether or not it exceeds a predetermined posture value. In addition to emitting a warning sound, if the cart is raised too far and moves forward significantly beyond the upper limit of the predetermined posture value, it can be automatically stopped even if the push button switch is pressed, making it easier for the operator to maintain the optimal posture. The cart does not come into contact with stair corners and slide down, and the risk of the cart or heavy objects falling is largely eliminated, making it possible to provide a hand-operated cart that can climb and descend stairs with high safety. .

[Brief explanation of the drawing]

FIG. 1 is a side view schematically showing the main parts of an embodiment of the present invention, and FIG. 2 is an exploded view showing a specific example of the inside of a storage box that houses a posture sensor and an alarm buzzer. FIG. 3 diagrammatically shows a specific example of attitude and control, and FIG. 4 shows an outline of an automatic stop circuit diagram. l...axis, 2...holding frame. 3...Wheels, 4...Batteries. 5...Electric motor, 6...Reducer. 7...Cart body, 9...Push button switch. 13... Storage box, 14... Pendulum weight. 15...Micro switch, 16...Buzzer. Patent Applicant: Komatsu Forklift Co., Ltd. Agent (Patent Attorney): Todai Matsuzawa 2. The fruit of Ijp that will give you a clear idea> Fig. 3, t, rgA

Claims (1)

[Claims] In a single-axis hand-pushed cart that transports heavy objects along stairs, a means for sensing the attitude of the cart body is provided on the cart body, and a predetermined attitude value is exceeded based on information obtained by the attitude sensing means. 1. An attitude control device, characterized in that the cart body is provided with means for issuing a warning when the above predetermined attitude value exceeds an upper limit, and automatically stopping the cart when the upper limit of the predetermined attitude value is exceeded.