JP3138833B2 - Luggage carrier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a luggage carrier for moving a luggage in a suspended state.

[0002]

2. Description of the Related Art A control device is provided with a load detector having a load transmitting body for receiving a load and a control valve which opens and closes in accordance with the load and having a function of controlling a working fluid, and a fluid pressure cylinder. Japanese Patent Application Laid-Open No. Sho 62-2 discloses a device for suspending a load in a zero-gravity state by supplying the load to
There is known a luggage carrier equipped with a load detector as disclosed in JP-A-01797.

A load detector, which is a working fluid control device disclosed in Japanese Patent Application Laid-Open No. 62-201797, communicates with a first chamber into which a working fluid from a pressure generating source is introduced and a fluid passage through the first chamber to a fluid pressure cylinder. A box having a variable volume second chamber connected thereto, and a load transmitting body movably engaged with the box having a fluid discharge passage communicating with the second chamber and receiving a load of a load and moving in a load direction under load. A control valve built in the box to selectively open and close the fluid passage and the fluid discharge passage, and an elastic member that applies a force corresponding to the total weight of the box and the load transmitting body to the piston of the fluid pressure cylinder. It is a complete configuration.

When the load is suspended and moved, a box is attached to the case suspended from the piston via a wire so as to be movable in the load direction, and the case is used as a part of the load transmitting body. The box floats inside the case when the transmitter is hanging the load,
The thrust in the counter-load direction applied to the piston by the working fluid introduced into the fluid pressure cylinder and the thrust in the counter-load direction applied to the box as the reaction force of the thrust in the load direction applied to the case by the working fluid sealed in the second chamber. The control valve closes the fluid passage and the fluid discharge passage in a state where.

[0005] When moving the load, particularly when moving the load in the vertical direction, the case is moved up and down by holding the case by hand. The pressure of the working fluid in the two chambers decreases, and the box moves upward together with the case in an attempt to maintain an output relationship proportional to the thrust applied to the piston, so that the load can be raised only by applying a small force to the case. The control valve can keep the fluid passage closed.

That is, the use of the load detector has the advantages that the load can be raised or lowered only by moving the case up and down with a small force, and the amount of working fluid used can be reduced.

However, for example, when the luggage is a part of an assembly and is to be moved to a predetermined position and the assembling operation is performed as it is, it is better to directly move the luggage by hand than to move the luggage with the case. It is much more advantageous in terms of workability.

[0008] Therefore, when the user manually moves the suspended luggage by hand, for example, and moves the luggage downward, the load detector always detects the load of the luggage. Just as in the case of an increase, the control valve opens to introduce working fluid into the second chamber and the fluid pressure cylinder, thereby generating a thrust opposing the downward force by the hand and trying to raise the load. That is, even if the user attempts to directly lower the luggage by hand, a thrust in the counter-load direction corresponding to the force is generated, so that it is impossible to move the luggage downward. When the baggage is moved upward, the thrust in the counter-load direction is reduced by the thrust corresponding to the upward force by the hand, and it is attempted to lower the load.

[0009]

An object of the present invention is to provide a hydraulic fluid for hanging a load through a load detector which detects the load of the working fluid and generates a fluid pressure proportional to the load. In the conventional luggage carrier, in which the luggage is introduced in a cylinder and the luggage is suspended in a zero-gravity state, it is impossible to move the luggage in the vertical direction by directly holding the luggage, which is inconvenient in terms of work. is there.

[0010]

In order to solve the above-mentioned problems, according to the present invention, one of the chambers partitioned by an operating piston forms a working chamber into which a working fluid for generating a thrust in a counter-load direction is introduced. A fluid pressure cylinder; an inlet chamber into which a working fluid is introduced; a piston for receiving a load of a load; a fluid chamber having a variable volume by the piston; and a communication between the inlet chamber and the fluid chamber when the load increases in response to the piston. And a control valve that opens the fluid chamber to the outside when the load decreases, and a load detector that has a case with the inlet chamber, piston, fluid chamber, and control valve built-in, and the case is connected to the operation piston in a suspended state. A conduit for supplying the working fluid introduced into the inlet chamber to the working chamber; and a pipe mounted on the conduit and operated by a pilot pressure by a fluid pressure proportional to a load of the load generated in the fluid chamber to transfer the working fluid in the working chamber to the pipe. A pressure regulating valve for maintaining a constant pressure equal to the fluid pressure, so that the hydraulic cylinder does not operate in a direction to cancel the load fluctuation, and holds the load directly in the vertical direction by hand. Achieve the purpose of being able to move.

A manual opening / closing valve is provided in a pilot passage connecting the fluid chamber and the pressure regulating valve, and when the load is suspended and equilibrated, the opening / closing valve is closed and the pressure regulating valve has a constant pressure proportional to the load of the load. To add pilot controls,
In addition, it is preferable that the load is suspended in a zero-gravity state by making the operating piston of the fluid pressure cylinder and the piston of the working fluid have the same effective area so that the load can be moved in the vertical direction with a small force.

[0012]

When the load is hung, the load causes the piston to open the control valve, introduces working fluid from the inlet chamber into the fluid chamber, and closes the control valve in a state in which a thrust in the opposite load direction equal to the load is applied to the piston. I do. The pressure fluid proportional to the load in the fluid chamber is operated by piloting the pressure regulating valve to supply the working fluid with a pressure equal to the pilot fluid pressure to the working chamber so that the working fluid is balanced with the load. When moving the load directly in the vertical direction by hand, the pressure regulating valve maintains the working fluid in the working chamber at a constant pressure regardless of the fluctuation of the fluid pressure in the fluid chamber. Since the load does not reach the cylinder, the load moves vertically.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.
A is a load detector, B is a hydraulic cylinder, C is a pressure regulating valve, and a hydraulic cylinder B fixed to an appropriate structure
The lower working chamber 53 partitioned by the operating piston 52 is connected to a conduit 57 branched from a supply pipe 56 extending from a pressure source 55 to a fluid inlet 12 of the load detector A, and is connected to the fluid outlet 13 of the load detector A. The pressure control valve C of the conduit 57 is connected by a pilot setting passage 59 having a manual on-off valve 58.

First, the load detector A will be described. The case 1 comprises a middle body 2 and an upper lid 3 and a lower lid 5 which are connected to the upper and lower portions thereof with screws 4 and 6, respectively. The suspension ring 7 is fixed, the lower lid 5 has an insertion hole 8 penetrating vertically, and the middle body 2 has a communication hole 9 in the center, a cylinder chamber 10 in the upper part, and an inlet chamber 11 in the lower part.
Further, it has a fluid inlet 12 communicating with the inlet chamber 11 and a fluid outlet 13 communicating with the cylinder chamber 10.

The insertion hole 8, the entrance chamber 11, the communication hole 9,
The cylinder chamber 10 is arranged on the central axis of the case 1, and the load receiving shaft 15 is inserted into these from below.
In the cylinder chamber 10, a piston 16 is provided with a 0 ring 1.
7 are fitted in a liquid-tight or air-tight manner.
1 is provided with a valve body 19 of a control valve 18, the lower end of which is inserted into the insertion hole 8, and the gap is made liquid-tight or air-tight by a 0-ring 23. A space below the piston 16 of the cylinder chamber 10 forms a fluid chamber 24 and is always in communication with the fluid outlet 13.

The load receiving shaft 15 penetrates loosely through the centers of the piston 16 and the valve body 19 and has gaps 25, 26 between them.
, And a nut 28 screwed into the screw portion 27 at the upper end contacts the upper surface of the piston 16 to apply a load to the piston 16.

Further, a downward first valve seat 20 formed in the middle body 2 along the communication hole 9, a second valve seat 21 projecting downward from the piston 16 and loosely penetrating the communication hole 9, an inlet chamber 1
1. A spring 2 which is inserted into the valve body 1 and applies an upward force to the valve body 19.
2 together with the valve element 19 and the control valve 18.
Is composed. It is clear from the figure that the two valve seats 20, 21 are arranged concentrically so as to contact the same end face of the valve body 19.

Further, a lever 30 is provided on the lower lid 5 with a pin 3.
1, the tip of which is rotatably attached to the annular groove 32 of the load receiving shaft 15.

The inlet chamber 1 of the load detector A having such a configuration.
In 1, a working fluid from the pressure generating source 55, generally, pressurized air is always introduced.

When the load is not suspended, the load receiving shaft 15
Since no load acts on the valve body 19, the valve body 19 is in contact with the first valve seat 20 by the force of the spring 22, and the working fluid in the inlet chamber 11 does not flow anywhere.

When the load is hung, a downward load acts on the load receiving shaft 15, and when this load overcomes the force of the spring 22, the piston 16 moves downward to push down the valve element 19 and push down the first valve seat 20. And release the seat surface. For this reason, the entrance room 11
The working fluid enters the fluid chamber 24 through the gap between the communication hole 9 and the first valve seat 20, and is sent from the fluid outlet 13 to the pressure regulating valve C via the pilot passage 59. The working fluid in the fluid chamber 24 generates a force for pushing up the piston 16, and this force F
Is F = PS when the pressure of the working fluid is P and the effective area of the piston 16 is S. While this force F is smaller than the load W applied to the load receiving shaft 15, the first valve seat 20 of the control valve 18 is separated from the valve body 19 and the working fluid is transferred to the fluid chamber 24.
And the pressure in the fluid chamber 24 is increased. F = W
Is reached, the valve element 19 is pushed by the force of the spring 22 and the first valve seat 2
0, and the working fluid is not introduced into the fluid chamber 24.

That is, when the force in the counter load direction applied by the working fluid introduced into the fluid chamber 24 to the piston 16 and the force in the load direction applied by the load receiving shaft 15 to the piston 16 are balanced, the control valve 18 The working fluid is sealed by closing the chamber 24, and this working fluid acts on the pressure regulating valve C to set the pilot operating force.

If the load acting on the load receiving shaft 15 increases from this state, F <W, so that the piston 16 moves downward to open the seat surfaces of the valve body 19 and the first valve seat 20, and again the F The working fluid is introduced into the fluid chamber 24 until = W.

Conversely, when the load acting on the load receiving shaft 15 decreases, W <F, so that the piston 16 moves upward and the seat surface of the valve body 19 and the second valve seat 21 is opened. At this time, since the valve element 19 is kept in contact with the first valve seat 20, the working fluid in the fluid chamber 24 flows between the load receiving shaft 15 and the valve element 19 through the gap between the communication hole 9 and the second valve seat 21. It is released from the insertion hole 8 to the outside through the gap 26. As the working fluid pressure in the fluid chamber 24 decreases, the piston 16 descends. When F = W, the second valve seat 21 closes the valve body 19.
Touch

As described above, a fluid pressure proportional to the load acting on the load receiving shaft 15 is generated in the fluid chamber 24, and the load and the upward force of the piston 16, which is the thrust in the anti-load direction, are always balanced. It becomes.

The lever 30 changes the working fluid pressure of the fluid chamber 24, which is in balance with the load.
When the load receiving shaft 15 is raised by rotating clockwise in FIG. 1, the piston 16 moves upward to open the seat surfaces of the valve body 19 and the second valve seat 21 to lower the working fluid pressure. ,
Conversely, when the load receiving shaft 15 is lowered by rotating counterclockwise, the piston 16 moves downward, and the valve body 19 and the first valve seat 20 are moved downward.
Then, the working fluid in the inlet chamber 11 is introduced to increase the working fluid pressure. Therefore, by operating the lever 30, the balance of the push-up force of the piston 16 with respect to the load is broken, and the working fluid pressure can be changed.

The load detector A connects a piston rod 54 extending downward from the operating piston 52 and the suspension ring 7 to a wire rope 61.
Suspended by the fluid pressure cylinder A by connecting
The load receiving shaft 15 removably suspends the load 62 with a wire rope 63.

Next, the pressure regulating valve C has a piston-shaped main valve body 68 which is seated on a valve seat 66 of a valve body 65 provided on a conduit 57 by the force of a valve spring 67, and a driving rod 69 for driving the main valve body 68. , And a relief valve 7 having a discharge passage 73 that opens the drive piston 70 to the atmosphere through the main valve body 65 from the drive piston 70 as a valve body 72 at the end of the drive rod 69.
1 and a pilot adjustment valve 80 that adjusts the working fluid on the inlet side of the main valve body 68 and causes the drive piston 70 to act as a pilot fluid.

The pilot regulating valve 80 is provided in a pilot fluid passage 76 connected from the primary chamber 74 of the main valve body 65 to the pilot fluid chamber 75, and is provided from the fluid chamber 24 acting on the pilot piston 81 via the pilot setting passage 59. The pilot valve body 82 is operated according to the working fluid pressure.

That is, when the load 62 is not suspended, the pilot regulating valve 80 is closed and the main valve body 68 is closed regardless of whether the working fluid is introduced into the working chamber 53 of the fluid pressure cylinder B. I speak. When the load 62 is suspended, a pressure fluid proportional to the load is generated in the fluid chamber 24 of the load detector A as described above, and this acts on the pilot piston 81 via the pilot setting passage 59 to cause the pilot adjustment valve 8 to operate.
0 is opened to an opening corresponding to the working fluid pressure from the fluid chamber 24, and the working fluid in the primary chamber 74 is introduced into the pilot fluid chamber 75 to act on the drive piston 70. Drive piston 7
0 sets the main valve body 68 according to the difference between the fluid pressure of the pilot fluid chamber 75 and the fluid pressure of the secondary fluid chamber 78 communicating with the secondary chamber 77 of the valve body 65 on the opposite side and the spring force of the valve spring 67. When the valve is opened and the working fluid supplied to the working chamber 53 of the fluid pressure cylinder B reaches a pressure equal to the fluid pressure of the fluid chamber 24, the main valve body 68 is closed.

When the operating piston 52 stops at a position where the load of the load 62 is balanced, the on-off valve 58 is closed to shut off the fluid pressure acting on the pilot piston 81 from the load detector A, A pilot operation at a constant pressure proportional to the load of the load 62 is applied.

In this state, if the load 62 is moved upward by directly holding it with the hand, the load is reduced.
Working chamber 5 holding the operating piston 52 at a fixed position
The working fluid is supplied to the working chamber 53 until the main valve body 68 opens and the pressure becomes equal to the fluid pressure in the fluid chamber 24.

On the other hand, when the load 62 is moved downward by directly holding it by hand, the load increases and the fluid pressure in the working chamber 53 increases. At this time, the pressure of the secondary fluid chamber 78 also increases, so that the drive piston 70 moves toward the pilot fluid chamber 75, and the relief valve 71 opens to make the pressure of the working fluid equal to the fluid pressure of the fluid chamber 24. Release until pressure is reached.

As described above, even if the load fluctuates because the load 62 is directly held, the pressure regulating valve C is maintained so that the fluid pressure in the working chamber 53 is maintained at a constant pressure proportional to the load of the load 62 itself. Supplies or discharges a working fluid, a slight force is applied by suspending the load 62 in a zero gravity state with the effective areas of the piston 16 of the load detector A and the operation piston 52 of the hydraulic cylinder B equal to each other. The luggage 62 can be arbitrarily moved in the up-down direction only by itself.

When the load 62 is moved in the vertical direction as described above, the load detector A generates a fluid pressure proportional to the load so as to always balance the load. And the generated fluid pressure does not affect the hydraulic cylinder B. When the baggage 62 is moved vertically by holding the case 1 of the load detector A by hand, the on-off valve 58 is opened, and the pressure regulating valve C is opened.
Adjusts the working fluid to a pressure proportional to the load and supplies the working fluid to the hydraulic cylinder B.

[0036]

As described above, according to the present invention, a load detector for generating a fluid pressure proportional to a load is provided between a hydraulic cylinder and a load suspended from the cylinder, and a pilot operation is performed by the fluid pressure. Since the working fluid supplied to the hydraulic cylinder is adjusted to a constant pressure equal to the fluid pressure using a pressure adjusting valve, the hydraulic cylinder is proportional to the load even if the load of the suspended load fluctuates. The working fluid at a constant pressure does not act to generate a force against the load fluctuation. That is, since the load fluctuation by hand does not reach the fluid pressure cylinder, the load can be directly held by hand and arbitrarily moved in the vertical direction, which is extremely convenient for work.

[Brief description of the drawings]

FIG. 1 is a sectional layout view showing an embodiment of the present invention.

[Explanation of symbols]

 A load detector B fluid pressure cylinder C pressure regulating valve 1 case 11 inlet chamber 16 piston 18 control valve 24 fluid chamber 52 operating piston 53 working chamber 57 conduit 58 on-off valve 59 pilot setting passage

Claims (3)

(57) [Claims] 1. A fluid pressure cylinder in which one of the chambers partitioned by an operating piston forms a working chamber into which a working fluid for generating a thrust in a counter load direction is introduced; an inlet chamber into which the working fluid is introduced; A piston for receiving a load of a load, a fluid chamber having a variable volume by the piston, and a control for communicating the inlet chamber and the fluid chamber when the load increases in response to the piston and opening the fluid chamber to the outside when the load decreases. A load detector comprising a valve, a case containing the inlet chamber, the piston, the fluid chamber, and a control valve, wherein the case is connected to the operating piston in a suspended state; a working fluid introduced into the inlet chamber A conduit for supplying the working fluid to the working chamber; and a pilot operation of the working fluid in the working chamber equal to the fluid pressure when the working fluid is pilot-operated by a fluid pressure proportional to a load of the load generated in the fluid chamber installed in the conduit. A pressure regulating valve for maintaining a constant pressure;
A luggage carrier, comprising: 2. The luggage carrier according to claim 1, wherein a manual setting valve is provided in a pilot setting passage connecting the fluid chamber and the pressure regulating valve. 3. The luggage carrier according to claim 1, wherein an effective area of the operating piston of the fluid pressure cylinder and an effective area of the piston of the load detector are equal to each other.