JP5400315B2 - Lifting device and method of using the same - Google Patents

Description

  The present invention relates to a lifting device suitably used for lifting and lowering heavy objects and a method of using the lifting device.

  Conventionally, in an elevating device for elevating (moving up and down) various articles and the like, hydraulic pressure is widely used as the operating force (see, for example, Patent Document 1). Specifically, such a lifting device includes a hydraulic cylinder portion that expands and contracts using hydraulic pressure, and the expansion and contraction of the hydraulic cylinder portion is used for lifting and lowering articles and the like. The lifting device (hydraulic lifting device) that uses such hydraulic pressure is a manual device (e.g., simple lifter) that is used when lifting and lowering heavy objects such as lifting a load of automobile parts or the like on a shelf in a factory or warehouse. Called). Conventionally, such a hydraulic lifting apparatus has the following problems.

That is, a hydraulic lifting device generally includes a support table such as a table that supports an article such as a heavy object (hereinafter referred to as an “elevated object”) that is to be moved up and down, and that can be moved up and down. In the conventional hydraulic lifting device, the support base is substantially constant regardless of whether or not the support base as described above supports the object to be lifted (whether the lifted object is on the support base). It has a structure that moves at speed. In other words, the conventional hydraulic lifting apparatus has a configuration in which the moving speed of the support base cannot be changed.
For this reason, the movement until the support base reaches a predetermined set height, which is a height position where the support base begins to receive a load from the object to be lifted or the object to be lifted is placed, is felt very slowly. There is a case.

In the conventional hydraulic lifting apparatus, the support base moves at a substantially constant speed because the flow rate of the pressure oil supplied to the hydraulic cylinder part by a hydraulic pump or the like is constant. Therefore, in order to change the moving speed of the support base in the conventional hydraulic lifting device, the change of the cross-sectional area of the cylinder in the hydraulic cylinder part or the replacement of a hydraulic pump or the like for supplying pressure oil to the hydraulic cylinder part Is required.
However, taking measures to change the speed of movement of the support base in the hydraulic lifting device in this way leads to a complicated device structure and an increase in cost.

On the other hand, some lifting devices used in factories or the like use external power such as external air or electricity when lifting and lowering the support base. In a configuration in which such external power is used, it is possible to adjust the moving speed of the support base by adjusting the external power.
However, in the configuration in which external power is used, piping for supplying air, wiring for supplying electricity, and the like are required, and these are connected to the lifting device. For this reason, the movement range and movement path | route about an raising / lowering apparatus are restrict | limited, and it becomes the hindrance of the structure which enables flexible correspondence, such as carrying around. Also, equipment for supplying external power to the lifting device is required.
Japanese Utility Model Publication No. 61-132395

  The present invention has been made in view of the above-described problems, and the problem to be solved is that it is possible to quickly raise and lower an object to be lifted without requiring external power such as external air or electricity. In addition, an object of the present invention is to provide an elevating device that can realize a simple structure and can be flexibly handled at low cost and a method of using the same.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, according to the first aspect of the present invention, the lifting device is a lifting device that supports the object to be lifted and is provided so that it can be lifted and lowered, and supports the lifting support portion so that it can be lifted and lowered. A hydraulic cylinder portion having a cylinder chamber through which liquid enters and exits, and the support base portion having a predetermined magnitude of pushing force that does not prevent the support base portion from being lowered by its own weight regardless of the vertical position of the support base portion. The liquid is connected to the cylinder chamber so as to be able to circulate and to be able to store the liquid. A tank part, and the cylinder chamber and the tank part are connected to be able to circulate the liquid and have an operation member that can be manually operated. Comprising a pump unit for supplying a fluid pressure by serial liquid, and a switching operation section where the liquid is to can flow state with respect to selectively said cylinder chamber one of the tank portion and the pump portion, wherein In a state where the tank portion is in a state where the liquid can flow to the cylinder chamber by the switching operation portion, the support force is obtained by a combined force of an external force and a push-up force from the push-up force applying portion. In the state in which the base portion can be raised and lowered, and the pump portion is in a state in which the liquid can flow to the cylinder chamber by the switching operation portion, the operation of the operation member in the pump portion allows the The support base can be raised and lowered .

  In Claim 2, it is a usage method of the raising / lowering apparatus of Claim 1, Comprising: While raising the said support base part, while holding | maintaining the said liquid with respect to each of the said tank part and the said pump part, The support base in a state in which the push-up force is applied with the assistance of the push-up force applying unit in a state where the liquid can flow through the cylinder chamber with the switching operation unit. After the first ascending process for raising the part to the first height position and the first ascending process, the liquid flows through the pump chamber to the cylinder chamber by the switching operation of the switching operation part. A second height higher than the first height position is achieved by supplying the hydraulic pressure from the pump portion to the cylinder chamber by operating the operation member. A second ascent process increased to location, but undergo.

As effects of the present invention, the following effects can be obtained.
In other words, according to the present invention, it is possible to quickly raise and lower an object to be lifted without requiring external power such as external air or electricity, and it is possible to realize a simple structure and to respond flexibly at low cost. It becomes possible.

Next, embodiments of the invention will be described.
The lifting device according to the present invention is a manual device that is used when lifting and lowering heavy objects (for example, about 30 to 40 kg) such as when lifting a luggage such as automobile parts on a shelf in a factory or a warehouse. It is used as a simple lifter.

As shown in FIG. 1, the lifting device 1 according to the present embodiment includes a table 2 as a support base, a hydraulic cylinder 3 as a hydraulic cylinder, an auxiliary spring mechanism 4 as a push-up force applying unit, and a tank. The auxiliary tank 5 as a part, the manual pump 6 as a pump part, and the manual operation valve (cock) 7 as a switching operation part are provided. The lifting device 1 moves the table 2 up and down (up and down) with respect to a predetermined support surface 50 such as a floor surface.
In the following description, the vertical direction in FIG. 1 is the vertical direction of the lifting device 1 according to the present embodiment, that is, the lifting direction of the lifting device 1.

The table 2 supports the object to be lifted and is provided so that it can be lifted and lowered.
The table 2 has a support surface 11 that supports the object to be lifted. In the present embodiment, the table 2 is configured as a plate-like member, and is provided in a state where the plate surface is substantially horizontal. The upper surface portion of the table 2 becomes the support surface 11.

The table 2 is provided by a hydraulic cylinder 3 so as to be movable up and down (movable up and down). That is, the hydraulic cylinder 3 is used to support the table 2, and the expansion and contraction of the hydraulic cylinder 3 and the elevation of the table 2 are synchronized.
The table 2 has a receiving surface 12 that is connected to the hydraulic cylinder 3 and receives a pressing force from the hydraulic cylinder 3. In the present embodiment, the lower surface portion of the table 2 configured as a plate-like member as described above serves as the receiving surface 12.

  In the present embodiment, the table 2 as the support base is configured as a plate-like member, but is not limited thereto. The configuration of the support base portion is not particularly limited as long as it has the support surface 11 and the receiving surface 12 and supports the object to be lifted and is provided so as to be liftable.

The hydraulic cylinder 3 has a cylinder chamber 13 in which oil (operating oil) 10 enters and exits as the table 2 moves up and down, while supporting the table 2 to be movable up and down.
The hydraulic cylinder 3 includes a cylinder case 14 and a sliding body 15 that is slidably mounted in the cylinder case 14. In the hydraulic cylinder 3, the sliding body 15 slides up and down.

The sliding body 15 has a rod portion 16 and a piston portion 17. The sliding body 15 slides with respect to the cylinder case 14 via the piston portion 17. That is, the piston portion 17 is a plug-like portion having a shape that can slide with respect to the inner wall of the cylinder case 14.
The rod portion 16 is a rod-shaped portion, and a piston portion 17 is provided on one end side thereof. The other end side of the rod portion 16 is a portion that protrudes and retracts from the cylinder case 14 as the sliding body 15 slides relative to the cylinder case 14.

  The vertical sliding of the sliding body 15 with respect to the cylinder case 14 is the expansion and contraction of the hydraulic cylinder 3 in the vertical direction. That is, when the sliding body 15 slides upward with respect to the cylinder case 14, the portion of the rod portion 16 protruding from the cylinder case 14 becomes longer, and the hydraulic cylinder 3 extends. Moreover, when the sliding body 15 slides downward with respect to the cylinder case 14, the portion of the rod portion 16 protruding from the cylinder case 14 is shortened, and the hydraulic cylinder 3 is shortened. As the hydraulic cylinder 3 expands and contracts, the table 2 moves up and down.

  That is, the hydraulic cylinder 3 is connected to the table 2 by connecting the upper end side (the side opposite to the side where the piston portion 17 is provided) of the rod portion 16 of the sliding body 15 to the receiving surface 12 of the table 2. Is done. Therefore, in a state where the cylinder case 14 is supported with respect to the support surface 50, the sliding of the sliding body 15 with respect to the cylinder case 14, that is, the expansion and contraction of the hydraulic cylinder 3, the table 2 moves to the support surface 50. It corresponds to moving up and down (moving up and down).

In the hydraulic cylinder 3 having such a configuration, the cylinder chamber 13 is formed in the cylinder case 14 on the side opposite to the rod portion 16 side (lower side in FIG. 1) of the piston portion 17. That is, the space formed below the piston portion 17 in the cylinder case 14 becomes the cylinder chamber 13 into which the oil 10 enters and exits as the table 2 moves up and down.
Therefore, the volume of the cylinder chamber 13 increases as the table 2 rises (extension of the hydraulic cylinder 3), and decreases as the table 2 descends (hydraulic cylinder 3 shortens).

  In addition, in the raising / lowering apparatus 1 of this embodiment, although the hydraulic cylinder 3 is provided as a hydraulic cylinder part, it is not limited to this. As a hydraulic cylinder part with which the raising / lowering device 1 is provided, while supporting the table 2 so that raising / lowering is possible, if it has the cylinder chamber 13 in which the liquid goes in / out with the raising / lowering of this table 2, another liquid is made into hydraulic fluid. It may be constituted by other hydraulic cylinders.

The auxiliary spring mechanism 4 assists the raising operation of the table 2 by applying a push-up force of a predetermined magnitude to the table 2.
The auxiliary spring mechanism 4 includes a spring body 18 and a support body 19 that supports the spring body 18.

The spring body 18 is configured as a unit body by one compression spring or a plurality of compression springs, and is disposed on the lower side (receiving surface 12 side) of the table 2. A support body 19 is provided below the spring body 18. The spring body 18 is supported between the table 2 and the support body 19 in a state in which the expansion / contraction direction (elastic deformation direction) is the vertical direction. That is, the upper end side of the spring body 18 is connected to or in contact with the receiving surface 12 of the table 2, and the lower end side is supported by the support body 19.
The spring body 18 exerts an elastic force between the table 2 and the support body 19 in a direction in which the table 2 and the support body 19 are relatively separated from each other. The support 19 is provided at a certain height with respect to the support surface 50.

Therefore, the spring body 18 applies an upward pressing force, that is, a lifting force, to the table 2 via the receiving surface 12. As a result, a push-up force is applied to the table 2 by the auxiliary spring mechanism 4.
In the present embodiment, the auxiliary spring mechanism 4 is configured such that the push-up force applied to the table 2 is substantially constant over substantially the entire range of the table 2 in the elevation range. That is, in the lifting device 1 of the present embodiment, a substantially constant push-up force is always applied to the table 2 from the auxiliary spring mechanism 4 regardless of the vertical position of the table 2. Thereby, the auxiliary spring mechanism 4 assists the raising operation of the table 2 by the operator's manual operation or the like.

Regarding the push-up force applied to the table 2 by the auxiliary spring mechanism 4, the predetermined magnitude is a magnitude that does not prevent the table 2 from being lowered by its own weight in the present embodiment. Specifically, the size is as follows.
In other words, in the lifting device 1, in a state where the oil 10 can enter and leave the cylinder chamber 13, no force in the direction of raising the table 2 acts on the table 2 other than the push-up force from the auxiliary spring mechanism 4. In this case, the table 2 is configured to descend to the descending end in the elevation range (vertical movement range).

  Therefore, the push-up force by the auxiliary spring mechanism 4 is not large enough to prevent the table 2 from being lowered by its own weight. The weight of the table 2 in a state in which the oil 10 can be taken in and out of the cylinder chamber 13 in the lifting device 1. It will be of a size that does not prevent the descent due to. In other words, the weight of the table 2 and the sliding body 15 that is integrally connected to the table 2 even in a state in which a substantially constant push-up force is applied to the table 2 from the auxiliary spring mechanism 4 as described above. Thus, the magnitude of the push-up force by the auxiliary spring mechanism 4 is set so that the table 2 is lowered to the lower end while pushing out the oil 10 from the cylinder chamber 13.

In addition, in the raising / lowering apparatus 1 of this embodiment, although the auxiliary | assistant spring mechanism 4 is provided as a raising force provision part, it is not limited to this. The lifting force applying unit included in the lifting device 1 may be any device that assists the lifting operation of the table 2 by applying a lifting force of a predetermined magnitude to the table 2. The push-up force applying unit may be, for example, a configuration using another elastic body, a configuration using a shock absorber, or a configuration using a cylinder mechanism such as an air cylinder or a hydraulic cylinder.
Further, the auxiliary spring mechanism 4 may be configured such that the push-up force with respect to the table 2 can be adjusted. Such a configuration is realized, for example, by a configuration in which an adjustable shock absorber is used or a posture (angle) of the shock absorber can be switched in a configuration in which a shock absorber is used.

The auxiliary tank 5 is connected to the cylinder chamber 13 of the hydraulic cylinder 3 so that the oil 10 can flow therethrough and can store the oil 10.
The auxiliary tank 5 has a tank case 20 that forms a tank chamber 21 in which the oil 10 is stored.

  The auxiliary tank 5 is connected to the cylinder chamber 13 of the hydraulic cylinder 3 via a first oil passage 22 constituted by piping or the like. That is, the first oil passage 22 connects the cylinder chamber 13 of the hydraulic cylinder 3 and the tank chamber 21 of the auxiliary tank 5 in communication. Thereby, the auxiliary tank 5 is connected to the cylinder chamber 13 so that the oil 10 can flow. That is, the oil 10 travels between the cylinder chamber 13 and the tank chamber 21 via the first oil passage 22 between the hydraulic cylinder 3 and the auxiliary tank 5.

The auxiliary tank 5 is provided so that the relative height position of the tank chamber 21 with respect to the cylinder chamber 13 in relation to the cylinder chamber 13 of the hydraulic cylinder 3 is increased. The first oil passage 22 that connects the tank chamber 21 and the cylinder chamber 13 is a path in which the oil 10 flowing from the tank chamber 21 to the cylinder chamber 13 is energized by its own weight and flows into the cylinder chamber 13. Arranged. That is, in the auxiliary tank 5 and the first oil passage 22, the potential energy due to the gravity of the cylinder chamber 13 changes when the oil 10 in the tank chamber 21 is guided to the cylinder chamber 13 with respect to the cylinder chamber 13. Configured to have kinetic energy.
Specifically, for example, the first oil passage 22 is a route that is arranged so that a part of the first oil passage 22 is in a vertical direction or an inclination direction that goes down from the auxiliary tank 5 side to the hydraulic cylinder 3 side.

  In addition, as described above, the lifting device 1 of the present embodiment is configured such that the table 2 is lowered to the lower end in the lifting range in a state where the oil 10 can be taken in and out of the cylinder chamber 13. Therefore, with respect to the auxiliary tank 5 and the first oil passage 22, in relation to the configuration of the hydraulic cylinder 3, the height position where the auxiliary tank 5 is provided and the first oil so as not to prevent the table 2 from being lowered by its own weight. A path shape, a pipe diameter, and the like of the path 22 are set.

  In the lifting device 1, the connecting structure between the cylinder chamber 13 and the auxiliary tank 5 is such that the oil 10 in the auxiliary tank 5 is brought into the cylinder chamber 13 due to the negative pressure generated in the cylinder chamber 13 when the table 2 is raised. It is configured to flow in. That is, when the table 2 is raised, a negative pressure is generated in the cylinder chamber 13 whose volume increases as the table 2 rises, and the oil 10 in the auxiliary tank 5 is sucked by the negative pressure. The auxiliary tank 5 is connected.

In addition, although the raising / lowering apparatus 1 of this embodiment is the structure by which the auxiliary tank 5 as a tank part is provided in a high position with respect to the cylinder chamber 13 of the hydraulic cylinder 3, it is not limited to this. As a tank part with which the lifting / lowering device 1 is provided, the oil 10 is connected to the cylinder chamber 13 of the hydraulic cylinder 3 so as to be able to circulate and the oil chamber 10 can be stored. The arrangement position is not particularly limited.
In addition, the liquid stored in the auxiliary tank 5 becomes hydraulic fluid in the hydraulic cylinder part provided in the lifting device 1. Therefore, when the hydraulic cylinder portion included in the lifting / lowering device 1 is constituted by another hydraulic cylinder instead of the hydraulic cylinder 3, the hydraulic fluid of the hydraulic cylinder is stored in the auxiliary tank 5.

As described above, in the lifting device 1 according to the present embodiment, the table 2 is relatively easy for the operator (by human power) to include the table 2, the hydraulic cylinder 3, the auxiliary spring mechanism 4, and the auxiliary tank 5. It is configured to lift. Specifically, the table 2 is configured to be lifted by a force of about 5 [kgf] or less.
That is, in the lifting device 1 of the present embodiment, the weight of the table 2, the diameter of the hydraulic cylinder 3, the magnitude of the pushing force by the auxiliary spring mechanism 4, and the like so that the table 2 can be lifted by an operator. The height position of the auxiliary tank 5 is set.

The manual pump 6 is connected to the cylinder chamber 13 of the hydraulic cylinder 3 and the auxiliary tank 5 so that the oil 10 can flow therethrough, and has an operation member that can be manually operated. On the other hand, the oil pressure by the oil 10 is supplied.
The manual pump 6 has an operation lever 23 as the operation member and a pump case 24 that forms a pump chamber 25. The manual pump 6 is a pump capable of manual operation, such as a hand pump.

  The manual pump 6 is connected to the cylinder chamber 13 of the hydraulic cylinder 3 via a first oil passage 22 and a second oil passage 26 connected to the first oil passage 22. That is, the second oil passage 26 is constituted by piping or the like, and one end side thereof is connected to the middle portion of the first oil passage 22 and the other end side thereof is connected to the manual pump 6 side. Therefore, the cylinder chamber 13 of the hydraulic cylinder 3 and the pump chamber of the manual pump 6 are provided by a part of the first oil passage 22 (portion from the connecting portion of the second oil passage 26 to the hydraulic cylinder 3 side) and the second oil passage 26. 25 is connected in communication. Thereby, the manual pump 6 is connected to the cylinder chamber 13 so that the oil 10 can flow.

  The manual pump 6 is connected to the auxiliary tank 5 via a third oil passage 27 constituted by piping or the like. That is, the third oil passage 27 connects the tank chamber 21 of the auxiliary tank 5 and the pump chamber 25 of the manual pump 6 to each other. Thereby, the manual pump 6 is connected to the auxiliary tank 5 so that the oil 10 can flow.

  The manual pump 6 pumps the oil 10 to the cylinder chamber 13. That is, the manual pump 6 passes the oil 10 in the pump chamber 25 through a part of the second oil passage 26 and the first oil passage 22 (a portion on the hydraulic cylinder 3 side from the connection portion of the second oil passage 26). Pressure is fed to the cylinder chamber 13. Thereby, the hydraulic pressure by the oil 10 is supplied to the cylinder chamber 13. Then, the oil 10 is pumped from the manual pump 6 by operating the operation lever 23.

  In the present embodiment, in the manual pump 6, the operation lever 23 extending from one end of the pump case 24 is operated so as to move in a direction approaching the pump case 24. This corresponds to the operation of pumping (see the operation lever 23 indicated by the two-dot chain line in FIG. 1).

In addition, as a pump part with which the raising / lowering apparatus 1 is provided, while having the oil 10 connected with the cylinder chamber 13 and the auxiliary tank 5 so that distribution | circulation is possible, it has an operation member which can be operated manually, and a cylinder is operated by operation of this operation member. As long as the hydraulic pressure by the oil 10 is supplied to the chamber 13, the manual pump 6 of the present embodiment is not limited.
Further, the hydraulic pressure supplied to the cylinder chamber 13 by the manual pump 6 is due to the hydraulic fluid in the hydraulic cylinder portion provided in the lifting device 1. Therefore, when the hydraulic cylinder unit included in the lifting / lowering device 1 is configured by another hydraulic cylinder instead of the hydraulic cylinder 3, the manual pump 6 supplies the hydraulic pressure generated by the hydraulic fluid of the hydraulic cylinder to the cylinder chamber 13. Will be supplied.

  The manual operation valve 7 selectively places either the auxiliary tank 5 or the manual pump 6 into the state in which the oil 10 can flow to the cylinder chamber 13.

  The manually operated valve 7 is provided at a connection portion of the second oil passage 26 with respect to the first oil passage 22. That is, the manual operation valve 7 is provided in the middle of the first oil passage 22, and the second oil passage 26 is connected to the first oil passage 22 via the manual operation valve 7.

The manual operation valve 7 switches at least the following two states with respect to the connection state of the auxiliary tank 5 and the manual pump 6 to the cylinder chamber 13. That is, the cylinder chamber 13 of the hydraulic cylinder 3 and the tank chamber 21 of the auxiliary tank 5 communicate with each other (hereinafter referred to as “first state”), and the cylinder chamber 13 of the hydraulic cylinder 3 and the pump chamber 25 of the manual pump 6. Are in a state of communication with each other (hereinafter referred to as “second state”).
In the following, regarding the first oil passage 22, the hydraulic cylinder 3 side from the manual operation valve 7 is referred to as “first cylinder side oil passage 22 a”, and the auxiliary tank 5 side is also referred to as first tank side oil passage 22 b ”. .

Therefore, in the first state accompanying the switching of the manual operation valve 7, the first cylinder side oil passage 22a and the first tank side oil passage 22b are in communication with each other via the manual operation valve 7, and the first cylinder side oil passage is connected. The cylinder chamber 13 and the tank chamber 21 are in communication with each other via 22a and the first tank side oil passage 22b (that is, the first oil passage 22). At the same time, the first cylinder side oil passage 22a and the second oil passage 26 through the manual operation valve 7 are not in communication, and the cylinder chamber 13 and the pump chamber through the first cylinder side oil passage 22a and the second oil passage 26 are in communication. Communication with 25 is cut off.
That is, in the first state, the oil 10 can flow through the cylinder chamber 13 in the auxiliary tank 5 out of the auxiliary tank 5 and the manual pump 6. Further, this first state corresponds to the state in which the oil 10 can be taken in and out of the cylinder chamber 13 in the lifting device 1 of the present embodiment.

Further, in the second state (refer to the manual operation valve 7 indicated by a two-dot chain line in FIG. 1) when the manual operation valve 7 is switched, the first cylinder side oil passage 22a and the second oil through the manual operation valve 7 are used. The passage 26 is in communication, and the cylinder chamber 13 and the pump chamber 25 are in communication with each other via the first cylinder-side oil passage 22a and the second oil passage 26. At the same time, the first cylinder-side oil passage 22a and the first tank-side oil passage 22b through the manual operation valve 7 are disconnected, and the first cylinder-side oil passage 22a and the first tank-side oil passage 22b (that is, the first tank-side oil passage 22b) The communication between the cylinder chamber 13 and the tank chamber 21 via the oil passage 22) is cut off.
In other words, in the second state, the manual pump 6 among the auxiliary tank 5 and the manual pump 6 can flow the oil 10 to the cylinder chamber 13.

As the manually operated valve 7, a valve having a configuration as a general manually operated 3 port switching valve is used.
In addition, as a switching operation part with which the raising / lowering apparatus 1 is provided, if the oil 10 can be selectively distribute | circulated with respect to the cylinder chamber 13 in any one of the auxiliary tank 5 and the manual pump 6, the structure will be There is no particular limitation, and an appropriate valve mechanism is used.

  A method of using the lifting device 1 of the present embodiment having the above configuration will be described with reference to FIG. In the following description, a state where the table 2 is located at the lower end in the ascending / descending range (see FIG. 2D) is referred to as an “initial state” for the elevating device 1 of the present embodiment.

  The usage method of the raising / lowering apparatus 1 of this embodiment passes through a 1st raising process and a 2nd raising process, when the table 2 is raised from the initial state of the raising / lowering apparatus 1. FIG. Hereinafter, each rising process will be described in detail.

  In the first ascending process, a predetermined amount of oil 10 is held in each of the auxiliary tank 5 and the manual pump 6, and the auxiliary tank 5 can flow through the cylinder chamber 13 by the manual operation valve 7. In this state, the assistance by the auxiliary spring mechanism 4 is used, and the table 2 in a state where the push-up force by the auxiliary spring mechanism 4 is applied is raised to the first height position.

  That is, in the initial state of the lifting device 1, a predetermined amount of oil 10 is held in each of the auxiliary tank 5 and the manual pump 6. That is, the auxiliary tank 5 is in a state where a predetermined amount of oil 10 is stored in the tank chamber 21, and the manual pump 6 is in a state where a predetermined amount of oil 10 is stored in the pump chamber 25. .

  In the first ascending process, the manual operation valve 7 is operated in the initial state of the elevating device 1 so that the first state, that is, the cylinder chamber 13 of the hydraulic cylinder 3 and the tank chamber 21 of the auxiliary tank 5 communicate with each other. The auxiliary tank 5 is in a state in which the oil 10 can flow through the cylinder chamber 13. From this state, the table 2 in a state where the lifting force by the auxiliary spring mechanism 4 is actuated is manually raised to the first height position by the operator.

As shown in FIG. 2A, when the table 2 is raised manually by the operator, the table 2 is raised by human power by the operator and push-up force from the auxiliary spring mechanism 4. That is, assistance by the auxiliary spring mechanism 4 is used.
Here, as the table 2 rises, the oil 10 in the auxiliary tank 5 flows into the cylinder chamber 13 due to the negative pressure in the hydraulic cylinder 3 and the gravitational force received in the first oil passage 22 (see arrow A1).

That is, as the table 2 is raised, the sliding body 15 of the hydraulic cylinder 3 connected to the table 2 is raised, the volume of the cylinder chamber 13 is increased, and a negative pressure is generated in the cylinder chamber 13. Thereby, the oil 10 in the tank chamber 21 of the auxiliary tank 5 communicating with the cylinder chamber 13 via the first oil passage 22 is sucked out. The oil 10 sucked out from the tank chamber 21 is guided to the cylinder chamber 13 through the first oil passage 22. Here, as described above, the first oil passage 22 is arranged so that the oil 10 flowing from the tank chamber 21 to the cylinder chamber 13 is energized by its own weight and flows into the cylinder chamber 13. .
For these reasons, the oil 10 guided to the cylinder chamber 13 through the first oil passage 22 flows into the cylinder chamber 13 by the action of negative pressure and gravity.

And as shown in FIG.2 (b), when the table 2 is raised by an operator's manual, the table 2 is the 1st height position (refer code | symbol h1 regarding the height position of the support surface 11). It is done until.
Here, the first height position of the table 2 is the height at which the table 2 begins to receive a load from the object to be lifted such as a heavy object or the object to be lifted is placed in the ascending process. The position corresponds to the height of the object set for the so-called table 2. Hereinafter, the first height position of the table 2 is referred to as the “elevated object set height”.

  Thus, until the table 2 reaches the object set height, the first ascending process is performed. Subsequently, a second ascent process is performed.

  In the second ascending process, the manual pump 6 is brought into a state in which the oil 10 can flow through the cylinder chamber 13 by the switching operation of the manual operation valve 7 after the first ascending process described above. By the hydraulic pressure being supplied from the manual pump 6 to the cylinder chamber 13 by the operation of, the table 2 is raised to a second height position higher than the height of the object set.

That is, in the second ascending process, as shown in FIG. 2B, the manual operation valve 7 is switched after the table 2 reaches the object set height in the first ascending process. The second state, that is, the cylinder chamber 13 of the hydraulic cylinder 3 and the pump chamber 25 of the manual pump 6 communicate with each other, and the manual pump 6 is in a state where the oil 10 can flow through the cylinder chamber 13.
Thereby, the path | route with respect to the cylinder chamber 13 of the manual pump 6 becomes effective. From such a state, the table 2 is raised to the second height position by the manual pump 6.

That is, as shown in FIG. 2C, when the operation lever 23 is operated (see arrow A2), the oil 10 in the pump chamber 25 of the manual pump 6 is pumped to the cylinder chamber 13 ( (See arrow A3). In other words, the oil 10 in the pump chamber 25 is sent out from the pump case 24 by the pumping action of the manual pump 6 in accordance with the operation of the operation lever 23, and the cylinder is set via the second oil passage 26 and the first cylinder side oil passage 22 a. The inside of the chamber 13 is pumped.
As a result, hydraulic pressure is supplied to the cylinder chamber 13, the sliding body 15 in the hydraulic cylinder 3 is raised, and the table 2 is raised.

When the table 2 is raised by the pressure of the oil 10 to the cylinder chamber 13 from the manual pump 6, the following action is obtained.
That is, when the oil 10 is pumped from the manual pump 6 to the cylinder chamber 13, the oil 10 is already in the cylinder case 14 (in the cylinder chamber 13). For this reason, the oil 10 delivered from the manual pump 6 flows into the cylinder case 14 (in the cylinder chamber 13), and the table 2 is immediately raised (the object to be lifted / lowered is lifted). That is, the rise of the table 2 due to the supply of the hydraulic pressure to the hydraulic cylinder 3 in the state where the oil 10 is already in the cylinder case 14 is a state where the oil 10 is not contained in the cylinder case 14 (for example, the table 2 is at the lower end). In comparison with the rise (initial operation) of the table 2 due to the supply of hydraulic pressure to the hydraulic cylinder 3 in the state (2), the table 2 is lifted by the amount of oil 10 in the first cylinder side oil passage 22a. Smooth. In other words, in a state where the oil 10 is already in the cylinder case 14, good transmission performance can be obtained for the pump power between the operation of the manual pump 6 by the operation lever 23 and the raising of the table 2.

Then, as shown in FIG. 2 (c), the table 2 is raised by the manual pump 6 until the table 2 reaches the second height (see symbol h2 regarding the height position of the support surface 11). Done.
Here, the second height of the height position of the table 2 is a target height position such as a height position where the object to be lifted on the table 2 is mounted in another place. Corresponds to the desired height when the lift is lifted. Hereinafter, the second height position of the table 2 is referred to as “the height of the lifted object”.

  Thus, until the table 2 reaches the object mounting height from the object set height, the second ascending process is performed.

  After the second ascending process, when the table 2 is lowered, the auxiliary tank 5 is brought into a state in which the oil 10 can flow again to the cylinder chamber 13 by the switching operation of the manual operation valve 7.

That is, as shown in FIG. 2 (d), when the object to be lifted / lifted on the table 2 is mounted at another place, the table 2 does not support the object to be lifted (free state), The manual operation valve 7 is switched, and the auxiliary tank 5 is brought into a state in which the oil 10 can flow to the cylinder chamber 13. In such a state, the table 2 is lowered by its own weight (see reference sign h0 for the height position of the support surface 11).
As a result, the oil 10 in the cylinder chamber 13 returns to the auxiliary tank 5 (see arrow A4).

  That is, as the table 2 descends due to its own weight, the sliding body 15 of the hydraulic cylinder 3 connected thereto descends, and the oil 10 in the cylinder chamber 13 is pushed out and discharged. The oil 10 discharged from the cylinder chamber 13 is guided into the tank chamber 21 of the auxiliary tank 5 through the first cylinder side oil passage 22a and the first tank side oil passage 22b (that is, the first oil passage 22).

  Of the oil 10 returned to the auxiliary tank 5, the overflow from the auxiliary tank 5 is returned to the manual pump 6 (see arrow A5). That is, the oil 10 overflowing from the auxiliary tank 5 is guided from the tank chamber 21 into the pump chamber 25 of the manual pump 6 through the third oil passage 27.

  As described above, in the lifting device 1 of the present embodiment, the operating force for lifting the table 2 circulates a predetermined amount of oil 10 between the hydraulic cylinder 3, the auxiliary tank 5, and the manual pump 6. Thus, external power such as external air and electricity is not necessary. Then, by raising the table 2 by the hydraulic pressure only for the stroke required to raise the object to be lifted without external power, a quick operation is possible when raising the object to be lifted.

  That is, in the lifting device 1, in the ascending process of the table 2, the table 2 is lifted by the operator's hand from the descending end to the height of the object set (first ascending process), and the table 2 is Is lifted using the pump power of the manual pump 6 from the height of the object set to the height of the object to be lifted, which is the required mounting height (second ascending process). In other words, in the lifting device 1, the auxiliary tank 5 is used before the manual pump 6 is operated, so that the table 2 can be manually lifted in addition to the pump power.

  As a result, the lifter, which has conventionally been able to move the support base (table 2 in the present embodiment) only at a substantially constant speed in the lifting range, has a simple structure in the configuration of the lifting device 1 of the present embodiment. The cost can be reduced, and the table 2 can be moved quickly at two stages.

In addition, since external power such as external air and electricity is not required, the moving range and moving path of the lifting device 1 are not restricted, and a configuration that enables flexible handling such as easy carrying can be realized. .
Specifically, for example, when the lifting device 1 is used in a state where it is placed on a carriage or the like, the lifting device 1 can be moved without a range or a route being restricted, and according to the situation at the site. Flexible response is possible.

  As described above, according to the lifting device 1 of the present embodiment, it is possible to quickly lift and lower an object to be lifted without requiring external power such as external air or electricity, and a simple structure can be realized. This enables flexible support at a low cost.

The figure which shows the structure of the raising / lowering apparatus which concerns on one Embodiment of this invention. Explanatory drawing about the usage method of a raising / lowering apparatus.

1 Lifting device 2 Table (support stand)
3 Hydraulic cylinder (hydraulic cylinder)
4 Auxiliary spring mechanism (lifting force application part)
5 Auxiliary tank (tank part)
6 Manual pump (pump part)
7 Manually operated valve (switching operation part)
10 Oil (liquid)
13 Cylinder chamber 23 Operation lever (operation member)

Claims (2)

A support base part that supports the object to be lifted and can be lifted and lowered;
A hydraulic cylinder part having a cylinder chamber that supports the support part so as to be able to be raised and lowered, and into and out of the liquid as the support part is raised and lowered;
Regardless of the vertical position of the support base part, the support base part is lifted by always applying a pushing force of a predetermined magnitude that does not prevent the support base part from being lowered by its own weight. A push-up force imparting unit for assisting the operation;
A tank unit configured to be capable of circulating the liquid to the cylinder chamber and configured to store the liquid;
The liquid is connected to the cylinder chamber and the tank portion so as to be able to flow, and has an operation member that can be manually operated, and hydraulic pressure by the liquid is supplied to the cylinder chamber by operation of the operation member. A pump part to perform,
A switching operation part for selectively allowing one of the tank part and the pump part to flow through the cylinder chamber;
Equipped with a,
In a state where the tank portion is in a state in which the liquid can circulate with respect to the cylinder chamber by the switching operation portion, due to a resultant force of an external force and a push-up force from the push-up force applying portion, The support base can be raised and lowered,
In the state where the pump unit is in a state where the liquid can flow to the cylinder chamber by the switching operation unit, the support base unit can be moved up and down by operation of the operation member in the pump unit. that, the lifting device. A method of using the lifting device according to claim 1,
When raising the support base,
The tank unit and the pump unit each hold a predetermined amount of the liquid, and the switching operation unit causes the tank unit to be in a state where the liquid can flow to the cylinder chamber. A first ascending process for raising the support base in a state where the push-up force is applied to a first height position using assistance by a force imparting part;
After the first ascending process, the liquid is allowed to flow through the cylinder chamber by the switching operation of the switching operation portion, and the cylinder chamber is moved from the pump portion by the operation of the operating member. A second ascending process of raising the support base to a second height position higher than the first height position by supplying the hydraulic pressure to
The method of using the lifting device characterized by passing through.

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