JP3097632U - Hydraulic grand piano carriage with descending speed adjustment mechanism - Google Patents

Abstract

A conventional grand piano transport trolley is a screw type, and a product which is raised and lowered by manually turning a wheel is mainstream. Even in a rare case of a hydraulic type, only a release valve is set in a descending hydraulic circuit. Therefore, when lowering the piano, it was very difficult to adjust the speed, which was dependent on the experience of the operator.
The present invention adopts a hydraulic pump system for the lifting and lowering function of the transport trolley, not only to achieve a more stable lifting and lowering function, reduce labor and time, reduce the weight and size of the product itself, but also to reduce the hydraulic pressure on the descending side. By setting the flow control valve and the release valve in series in the circuit, an appropriate descending speed is always ensured regardless of the mass of the piano, and it is devised not to damage or impact the piano.
[Selection diagram] Fig. 1

Description

[0001]
[Technical field to which the invention belongs]
The present invention is a transport trolley that employs a hydraulic pump for a lifting function of a trolley for moving a piano on a stage or the like.
[0002]
[Prior art]
Conventional bogies mainly use a screw-type product that is raised and lowered by manually turning a wheel.In rare cases, even in the case of a hydraulic type, the lowering hydraulic circuit is set only with an open valve, so the piano is lowered. At that time, it was very difficult to adjust the speed, and this was due to the experience of the operator.
[0003]
[Problems to be solved by the invention]
In the method of raising and lowering by manual rotation, it is necessary to go under the piano and move the mechanism, and when the weight of the piano is applied, the rotation of the wheel becomes very heavy, and it is very easy to raise and lower It was labor intensive.
Even with a product that uses a hydraulic pump, the transport trolley itself is large and heavy. There has been a problem that the leg may be broken or the precision parts inside the piano may be damaged.
[0004]
[Means for Solving the Problems]
By incorporating the hydraulic pump into the elevating mechanism, it is possible to easily ascend by simply depressing the pedal several times with the foot, and to lower by simply grasping the lever. As a guide, it takes about 5 seconds to ascend and about 3 seconds to descend. In the case of the conventional manual rotary type, at least about 3 minutes of working time is required, which greatly reduces labor and time.
In addition, the flow control valve and the release valve are set in series on the hydraulic pump-type descending hydraulic circuit, and the flow control valve is adjusted according to the mass of the piano. The descending speed can be set appropriately. Therefore, the piano can be grounded without giving an impact to the piano.
Furthermore, by attaching an oil pan (oil pan) to the lower part of the truck, it is considered that even in case of oil leakage, the expensive wooden floor material of the concert hall is not contaminated.
[0005]
[Embodiment of the invention]
Adjust the flow control valve in advance according to the mass of the piano. This can be set initially and does not need to be changed afterwards.
Place the transport truck at the bottom of the piano, and align the fulcrum to lift forward (keyboard part) and backward (center of the piano). Operate the lift lever to raise the piano with the arm. When the piano legs have risen from the floor by at least a sufficient amount to move, the piano is moved to a predetermined position such as on the stage. When lowering the piano, simply operate the lowering lever directly connected to the opening valve regardless of the stroke amount, and the piano lowers while maintaining an appropriate speed, and the piano legs touch the floor.
[0006]
【Example】
Hereinafter, an embodiment will be described with reference to the accompanying drawings.
1 is a carriage body, 2 is a brace raised and lowered by a hydraulic pump, 3 is a cradle, 4 is a hydraulic pump, 5 is a flow control valve, 6 is an opening valve, 7 is a lowering lever for operating an opening valve, and 8 is a hydraulic pressure. A pedal for operating the pump to raise the arm, and 9 is a wheel for moving the carriage, is provided with a stopper. Reference numeral 10 denotes an oil pan for dealing with oil leakage.
[0007]
The scale of the piano is indicated on the dial of the flow control valve of No. 5 along with the scale. By setting the dial at the appropriate scale position, a stable descent speed that is not affected by the experience of the operator can be set. It becomes possible.
[Effect of the invention]
As described above, while the hydraulic transport truck is convenient, the manual rotary transport truck still has a penetration rate of 90% or more, in order to avoid the impact on the musical instrument due to the descending speed and the stage due to the oil leak. Two major points were the prevention of stains on the flooring. This invention solves the problem and enables safe and quick work.
[Brief description of the drawings]
FIG. 1 is an overall view showing a practical example of a transport vehicle of the present invention.
FIG. 2 is a partially cutaway cross-sectional view of the carrier.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Conveyor body 2 Arm 3 Receiving stand 4 Hydraulic pump 5 Flow control valve 6 Opening valve 7 Descending lever 8 Ascending pedal 9 Wheel 10 Oil pan (Oil leak countermeasure pan)

Claims (1)

Hydraulic pump system is adopted for the lifting and lowering function of the transport trolley that moves the grand piano (hereinafter referred to as the piano). By setting the flow control valve and the release valve in series in the circuit, an appropriate descent speed is always ensured regardless of the mass of the piano, and it is devised not to damage or impact the expensive and precise piano.

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