JP4414259B2 - Drive device for reciprocating movement of an object - Google Patents

Description

The present invention relates to a driving apparatus for holding an object to be a load and moving the object in a direction in which the object acts as a load and in the opposite direction.

Conventionally, a nursing lift using a fluid pressure cylinder device that uses the pressure of tap water to move up to assist bathing for elderly people and people with physical disabilities who are difficult to walk on their own Has been proposed (Patent Document 1).
JP-A-8-33694

  However, the pressure of domestic tap water is as low as about 0.15 MPa, and in order to obtain the force to lift the cared person by the pressure of tap water in the fluid pressure cylinder device, a large pressure receiving area is required and the cylinder diameter is large. I must.

  On the other hand, since the care lift for assisting bathing is installed in a narrow bathroom, it is desirable that the hydraulic cylinder device be smaller. In addition, since a large lift for caregiving gives caregivers a feeling of pressure and a psychological burden, a smaller hydraulic cylinder device with a smaller cylinder diameter is required.

The present invention has been made in view of the above-described problems, and uses a small fluid pressure cylinder device having a small cylinder diameter and a low-pressure working fluid to drive a cared person or the like vertically. an object of the present invention is to provide a driving DoSo location can be.

A driving apparatus according to the present invention is a driving apparatus for holding an object that is a load and reciprocating the object, and a cylinder tube that is attached to a support member for supporting the object and moves integrally A piston that slides on the inner peripheral surface of the cylinder tube, two cylinder covers that seal both ends of the cylinder tube, and a rod that protrudes from both end surfaces of the piston and slidably passes through the two cylinder covers A first cylinder chamber formed between the piston and one of the cylinder covers, a second cylinder chamber formed between the piston and the other cylinder cover, and the first cylinder chamber has a pressure accumulation chamber for pressurizing 蓄 gas communicates with the cylinder chamber, the thrust of the cylinder tube by gas pressure in the first cylinder chamber, said Siri To be greater than the force of the exerted in the direction of the thrust and reverse load against Dachubu, pressure receiving area and the gas pressure in the first cylinder chamber is set, it is supplied to the second cylinder chamber The pressure receiving area of the second cylinder chamber and the pressure of the liquid are set so that the thrust of the cylinder tube due to the liquid exceeds the difference between the thrust due to the gas pressure and the load force. ing.

In a preferred embodiment, the 蓄 chamber is formed inside the first of said rod side of the cylinder chamber.

  According to the present invention, a cared person or the like can be driven in the vertical direction by using a small fluid pressure cylinder device having a small cylinder diameter and using a low-pressure working fluid.

  1 is a front sectional view of a fluid pressure cylinder device 1 according to the present invention, FIG. 2 is a plan view of the fluid pressure cylinder device 1 provided in the bathroom 2, and FIG. 3 is a diagram of the fluid pressure cylinder device 1 provided in the bathroom 2. FIG. 4 is a front view, FIG. 4 is a diagram showing the operation of the ascending process and the descending process of the fluid pressure cylinder device 1, and FIG. 5 is a diagram showing various forces applied to the fluid pressure cylinder device 1. 3 shows the chair 31 and the bathtub 33 in FIG. 2 rotated 90 degrees to the right for the sake of understanding.

  1 to 3, the fluid pressure cylinder device 1 is configured such that when a person (care recipient) 31 in a bathroom 2 carries a chair 31 or the like between a washing place 32 and a bathtub 33, the cylinder tube 11 is made of tap water. Is raised and lowered.

  The fluid pressure cylinder device 1 is integrated with a cylinder tube 11, a piston 12 that slides on the inner peripheral surface of the cylinder tube 11, an upper cylinder cover 13 and a lower cylinder cover 14 provided at both ends of the cylinder tube 11, and the piston 12. The upper rod 15 and the lower rod 16 are formed. A support member 35 is fixed to the cylinder tube 11, and a chair 31 for sitting a care receiver is attached to the support member 35. The fluid pressure cylinder device 1 includes a plurality of push rods 34a to 34c (FIGS. 2 and 3) in which a lower fixing member 18 integrated with a lower rod 16 is in contact with the floor surface of the bathroom 2 and is connected to a cover 17 of the upper rod 15. Is fixed vertically to the floor surface of the bathroom 2 by radially extending and pressing the pillars of the bathroom 2. Thus, the fluid pressure cylinder device 1 is a double rod type cylinder device in which the upper rod 15 and the lower rod 16 are fixed to the bathroom 2, and the piston 12 slides on the inner peripheral surface of the cylinder tube 11. The cylinder tube 11 is raised or lowered.

  Both ends of the cylinder tube 11 are closed by an upper cylinder cover 13 and a lower cylinder cover 14. The upper cylinder cover 13 forms a first cylinder chamber 19 together with the cylinder tube 11, and the lower cylinder cover 14 moves together with the cylinder tube 11. A second cylinder chamber 20 is formed. The upper cylinder cover 13 is provided with a pressure release 131. The pressure release 131 is normally closed by a stopper or the like.

  An upper rod 15 and a lower rod 16 are connected to the piston 12 at both end faces, and they are integrated.

The upper rod 15 is formed of a hollow circular tube, and an upper end portion is sealed by a cover 17 to form a hollow portion 23 inside. In the vicinity of the piston 12, a communication hole 22 that connects the hollow portion 23 and the first cylinder chamber 19 is provided. The cover 17 is provided with a port 171. Port 171, when provided separately from 蓄 divider is a fluid pressure cylinder device 1 is used for connection to the 蓄 divider.

  The lower rod 16 is formed of a hollow circular tube like the upper rod 15, and the inside of the circular tube is a liquid flow path 26 for supplying tap water to the second cylinder chamber 20. In the vicinity of the piston 12, a liquid passage hole 27 that connects the liquid flow path 26 and the second cylinder chamber 20 is provided. The liquid flow path 26 communicates with a supply / discharge port 28 provided in the lower fixing member 18 and opening to the outside. The tap water is supplied from the supply / discharge port 28 to the second cylinder chamber 20 via the liquid flow path 26 and the liquid passage hole 27. Further, the tap water supplied to the second cylinder chamber 20 is discharged from the supply / discharge port 28 to the outside through the reverse path. The inlet / outlet port 28 includes a foot valve 29 (see FIG. 3) for switching between raising and lowering of the cylinder tube 11, and a speed controller (not shown) for adjusting the speed of the raising and lowering operations of the cylinder tube 11. Connected. Further, a check valve for preventing the backflow of tap water may be provided at the supply / discharge port 28.

  A vent pipe 21 is provided inside the lower rod 16. The upper end portion of the vent pipe 21 is connected to a through hole 121 provided in the piston 12, and the lower end portion passes through the lower fixing member 18 and opens to the outside. By supplying compressed gas from the opening at the lower end of the vent pipe 21, the hollow portion 23 and the first cylinder chamber 19 can be filled with compressed gas.

  The caregiver operates the foot valve 29 to raise and lower the cylinder tube 11 in the fluid pressure cylinder device 1. When stopping the cylinder tube 11 during the ascending operation or the descending operation, the foot valve 29 is operated to stop the discharge of tap water from the second cylinder chamber 20 or the supply of tap water to the second cylinder chamber 20. .

  Next, the raising operation and the lowering operation of the cylinder tube 11 will be described with reference to FIGS. 4 and 5. A cared person sits on the chair 31, and the total weight including the chair 31 and the cared person may be referred to as “load”. The load is supported by the cylinder tube 11.

  The first cylinder chamber 19 and the hollow portion 23 of the fluid pressure cylinder device 1 are filled with compressed gas. The filled gas has a pressure that can drive the cylinder tube 11 upward and move the load to the upward end. Therefore, the load is always subjected to a force that is moved upward by the compressed gas. The volume of the first cylinder chamber 19 changes according to the movement of the cylinder tube 11, and the internal pressure changes accordingly, but the cylinder tube 11 rises to the rising end and the pressure becomes the lowest. However, the pressure is sufficient to hold the load at that position. That is, in FIG. 5, the thrust A of the cylinder tube 11 due to the gas pressure is always larger than the load W.

  In this state, the lowering operation of the fluid pressure cylinder device 1 is performed by supplying tap water to the second cylinder chamber 20 as shown in the right half of FIG. That is, the supply of tap water causes the tap water pressure to act on the second cylinder chamber 20, thereby generating a downward thrust C (see FIG. 5). Since the sum of the thrust C and the load W is larger than the thrust A, the cylinder tube 11 is lowered.

  As the cylinder tube 11 descends, the volume of the first cylinder chamber 19 decreases, whereby the gas in the first cylinder chamber 19 is compressed, and the gas pressure is highest at the descending end. That is, as the cylinder tube 11 is lowered, the energy up to that time is accumulated in the form of an increase in the gas pressure in the first cylinder chamber 19. However, even when the cylinder tube 11 descends to the descending end and the gas pressure becomes maximum, the cylinder tube 11 can be held at the lowered position by the tap water pressure.

  In the fluid pressure cylinder device 1, in order to enable such a lowering operation, the pressure of tap water, the pressure receiving areas of the first cylinder chamber 19 and the second cylinder chamber, the volume of the hollow portion 23, and the like are taken into consideration. The pressure of the gas to be filled in advance is set.

  The ascending operation of the cylinder tube 11 is performed by discharging the tap water in the second cylinder chamber 20 as shown in the left half of FIG. That is, by discharging the tap water in the second cylinder chamber 20, the pressure in the second cylinder chamber 20 is substantially reduced to 0, whereby the cylinder tube 11 is moved by the gas pressure in the first cylinder chamber 19. Raise.

  Thus, in the fluid pressure cylinder device 1, the ascending operation is performed only by the pressure of the gas filled in the first cylinder chamber 19 and the hollow portion 23, and only the load W is applied to the upward thrust A due to the gas pressure. The descent operation is performed by compensating the insufficient downward force with the thrust C generated by the tap water pressure.

  In other words, the load W is balanced to such an extent that it can be raised by the thrust A due to the pressure of the gas in the first cylinder chamber 19, and is lowered by the thrust C due to the low pressure of tap water.

  Therefore, the fluid pressure cylinder device 1 can lower the load W by the small thrust C due to the low pressure of the tap water and the small cylinder diameter, and the tap water pressure is set to 0 and the thrust C is set to 0. The load W can be increased.

  On the other hand, in the conventional method in which the load is directly lifted by supplying tap water, it is necessary to obtain a force larger than the downward force due to the load W by the tap water, and a large cylinder diameter is required. .

  Therefore, when the applied load W is the same, the fluid pressure cylinder device 1 can make the cylinder diameter smaller than the conventional one.

  In the fluid pressure cylinder device 1, compressed air is used as the gas filled in the hollow portion 23. In addition, a compressed gas having low activity such as nitrogen or carbon dioxide can be used as a gas to be filled. Further, other liquids can be used in place of tap water as the working fluid for performing the lowering operation.

  In the above-described embodiment, it is preferable that the volume change of the first cylinder chamber 19 due to the movement of the cylinder tube 11 is as small as possible and the pressure fluctuation in the first cylinder chamber 19 is as small as possible. Therefore, the diameter of the upper rod 15 is increased, the pressure receiving area of the first cylinder chamber 19 is decreased, and the air pressure is increased in order to obtain the necessary thrust A.

Also, above the upper rod 15 integral with the upper rod 15, or separately from the hydraulic cylinder device 1, it is provided with a 蓄 divider having 蓄 chamber communicating with the first cylinder chamber 19 and the hollow portion 23 Good. By providing the external voltage of 蓄 reduces the pressure fluctuation of the first cylinder chamber 19 and the hollow portion 23, it is possible to suppress variation in thrust A.

  In addition, when the cared person gets off from the chair 31 when the chair 31 and the cared person are loads as in the above example, the load W is reduced. Each cylinder diameter, air pressure, tap water pressure, and the like must be set so that the ascending and descending operations are performed. Alternatively, when the care receiver descends from the chair 31 and the load decreases, the air in the hollow portion 23 may be removed to reduce the pressure and reduce the upward thrust A. Alternatively, a tank filled with compressed air may be used, and compressed air having a necessary pressure may be supplied from the tank to the first cylinder chamber 19.

  When maintaining the fluid pressure cylinder device 1 in the resting state, for example, the foot valve 29 is held in the neutral position after the chair 31 is lowered to the lower end, and the second cylinder chamber 20 is filled with tap water. Keep it as Alternatively, the chair 31 is moved to the rising end.

  FIG. 6 shows a fluid pressure cylinder device 1B according to another embodiment of the present invention.

  In FIG. 6, the fluid pressure cylinder device 1B includes a gas spring device 4B, a hydraulic cylinder device 5B, and a support member 35B.

  The gas spring device 4B includes a cylinder tube 11Ba and a rod 15B that are sealed at both ends, and is fixed to the floor surface. The rod 15B slidably penetrates the upper end surface of the cylinder tube 11Ba. A stopper 12Ba is provided at the lower end of the rod 15B. The cylinder tube 11Ba is filled with compressed gas, whereby a substantially constant thrust C in the upward direction is generated in the rod 15B.

  The hydraulic cylinder device 5B is integrated with the cylinder tube 11Bb, the cylinder cover 14B that seals the upper end of the cylinder tube 11Bb, the piston 12Bb that slides on the inner peripheral surface of the cylinder tube 11Bb, and the piston 12Bb. It consists of an extended rod 16B. A cylinder chamber 20B is formed by the cylinder tube 11Bb, the cylinder cover 14B, and the piston 12Bb. The hydraulic cylinder device 5B is fixed to the ceiling or the like on the same axis as the gas spring device 4B. A pipe for supplying or discharging a pressurized fluid such as tap water is connected to the cylinder chamber 20B.

  The support member 35B is connected to the upper end of the rod 15B and the lower end of the rod 16B, and is supported so as to be movable in the vertical direction. Further, for example, a chair or the like for raising or lowering a cared person is attached to the support member 35B.

  The thrust A of the rod 15 </ b> B of the gas spring device 4 </ b> B is such that the support member 35 </ b> B can be lifted and the load W of a cared person on the chair can be moved to the rising end. The descending operation of the fluid pressure cylinder device 1B is performed by supplying tap water to the cylinder chamber 20B. By supplying tap water, a downward thrust C is generated in the rod 16B, and the sum of the thrust C and the load W is larger than the thrust A, so that the support member 35B, that is, the load W is lowered.

  The raising operation of the fluid pressure cylinder device 1B is performed by discharging the tap water in the cylinder chamber 20B. By discharging the tap water in the cylinder chamber 20B, the pressure in the cylinder chamber 20B becomes substantially zero, so the load W is increased by the thrust A of the rod 15B of the gas spring device 4B.

  Note that the rod 15B and the rod 16B may be directly connected without using the support member 35B, or may be manufactured integrally.

  FIG. 7 shows a fluid pressure cylinder device 1C according to another embodiment of the present invention.

  In FIG. 7, the fluid pressure cylinder device 1C includes a gas spring device 4C, a hydraulic cylinder device 5C, and a support member 35C.

  In the fluid pressure cylinder device 1B described above, the gas spring device 4B and the hydraulic cylinder device 5B are arranged in series, but in the fluid pressure cylinder device 1C of this embodiment, the gas spring device 4C and the fluid pressure The cylinder device 5C is arranged in parallel. The structures of the gas spring device 4C and the hydraulic cylinder device 5C are the same as those of the gas spring device 4B and the hydraulic cylinder device 5B described above.

  Also in this embodiment, the thrust A of the rod 15C of the gas spring device 4C is such that the support member 35C can be driven to move up and the load W of a cared person on the chair can be moved to the rising end. .

  By supplying tap water to the cylinder chamber 20C, a downward thrust C is generated in the rod 16C, and the sum of the thrust C and the load W becomes larger than the thrust A, so that the support member 35C, that is, the load W is lowered. By discharging the tap water in the cylinder chamber 20C, the load W is increased by the thrust A of the rod 15C of the gas spring device 4C.

  A guide member may be provided so that the support member 35C moves smoothly up and down.

  In the above-described embodiment, in order to obtain the thrust A that increases the load W, a coil spring may be provided instead of or together with the compressed gas. Various piping schemes and piping materials can be used to supply or discharge compressed gas or compressed air, tap water, and other pressurized fluids. Although the tap water is supplied to the cylinder chambers 20, 20B, 20C, other pressurized fluid may be supplied.

  In the above-described embodiment, the fluid pressure cylinder devices 1, 1B, 1C can be used for applications other than the care lift.

  In addition, the structure, shape, dimensions, number, material, etc. of each part or the whole of the fluid pressure cylinder device 1, 1B, 1C can be appropriately changed in accordance with the spirit of the present invention.

It is front sectional drawing of the fluid pressure cylinder apparatus which concerns on this invention. It is a top view of the fluid pressure cylinder apparatus provided in the bathroom. It is a front view of the fluid pressure cylinder apparatus provided in the bathroom. It is a figure which shows the operation | movement of the raise process and the descent | fall process of a fluid pressure cylinder apparatus. It is a figure which shows the various force added to a fluid pressure cylinder apparatus. It is a figure which shows the fluid pressure cylinder apparatus which concerns on other embodiment. It is a figure which shows the fluid pressure cylinder apparatus which concerns on other embodiment.

Explanation of symbols

1, 1B, 1C fluid pressure cylinder device (drive device)
4B, 4C gas spring device (spring means)
5B, 5C hydraulic cylinder device 11 cylinder tube 12 piston 13 upper cylinder cover (cylinder cover)
14 Lower cylinder cover (cylinder cover)
15 upper rod (rod)
16 Lower rod (rod)
19 First cylinder chamber (first cylinder chamber)
20 Second cylinder chamber (second cylinder chamber)
23 hollow section (蓄 chamber)

Claims (2)

A driving device for holding an object to be a load and reciprocating the object,
A cylinder tube to which a support member for supporting the object is attached and moves integrally;
A piston sliding on the inner peripheral surface of the cylinder tube;
Two cylinder covers for sealing both ends of the cylinder tube;
A rod protruding from both end faces of the piston and slidably penetrating the two cylinder covers;
A first cylinder chamber formed between the piston and one of the cylinder covers;
A second cylinder chamber formed between the piston and the other cylinder cover;
Anda accumulator for pressurizing 蓄 gas communicates with the first cylinder chamber,
The thrust of the cylinder tube due to the gas pressure in the first cylinder chamber is larger than the force of the load applied to the cylinder tube in the direction opposite to the thrust. The pressure receiving area and the gas pressure are set,
The pressure received by the second cylinder chamber is such that the thrust of the cylinder tube by the liquid supplied to the second cylinder chamber exceeds the difference between the thrust by the gas pressure and the force of the load. The area and the pressure of the liquid are set,
A drive device for reciprocating movement of an object. The pressure accumulating chamber is formed inside the rod on the first cylinder chamber side,
A drive device for reciprocating movement of an object according to claim 1 .