JPH0132157B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic jack operated by air pressure. More specifically, an air reservoir for storing compressed air or other suitable compressed gas is provided inside the jack itself, and the pressure of the compressed gas is applied to oil or other hydraulic fluid through a pressure regulator. This invention relates to a hydro-neumate jack that uses the pressure to move a piston to raise and lower the jack.

Conventionally, various types of jacks have been provided, such as screw jacks, ratchet jacks, hydraulic jacks, pneumatic jacks, etc., but there is no jack that does not require human power, is compact, and can stably maintain a desired lifting height. I wasn't there.

A device that converts gas pressure into liquid pressure to operate a piston is disclosed, for example, in Japanese Utility Model Publication No. 37-7618, but this converts gas pressure/hydraulic pressure separately from the jack body.
The system is equipped with a hydraulic pressure conversion tank, making the device large and difficult to easily transport.

In addition, Utility Model Application Publication No. 17578/1983 and Japanese Patent Application Publication No. 1973
Publication No. 16256, Japanese Utility Model Publication No. 55-552, etc. also disclose a jack that converts gas pressure into hydraulic pressure to operate a piston, but the pressure chamber and hydraulic pressure chamber are arranged in series, The problem was that the jack itself had to be long and large in order to obtain a sufficient lifting height.

The present invention has been made to solve the above problems, and its purpose is to provide a gas pressure/hydraulic pressure converting jack that is compact and capable of stably maintaining a desired lifting height. Our goal is to provide a hydro-neumatizing system like this.

The above object includes: a hollow cylindrical main body; an outer housing that is attached to the outside of the main body and forms a first tank chamber between the main body; an air/liquid impervious deformable bag that divides the tank chamber of No. 1 into a working fluid storage chamber and a gas introduction chamber; a second tank chamber; a piston chamber formed between the inner wall surface of the main body and the outer wall surface of the second tank chamber; a cylindrical body that is movably inserted in the piston chamber along its axial direction and supports a load to be lifted by a jack; a fixed ring-shaped piston; a hydraulic fluid flow path that communicates the hydraulic fluid storage chamber of the first tank chamber with the piston chamber and allows the hydraulic fluid to act on the piston; and a hydraulic fluid flow path provided on the hydraulic fluid flow path. a check valve that allows the hydraulic fluid to flow from the first tank chamber to the piston chamber but prevents the hydraulic fluid from flowing in the opposite direction; a ventilation path for sending the gas into the gas introduction chamber of the chamber; and a ventilation path provided between the second tank chamber and the ventilation path;
When the jack is driven, it is released based on an external operation and the compressed air in the second tank chamber is sent to the gas introduction chamber of the first tank chamber through the ventilation path, and the pressure in the gas introduction chamber is predetermined. This can be achieved by a pressure regulator that closes when a certain value is reached, and a hydro-neumate jack.

With the above configuration, the first tank chamber is provided on the outside of the main body of the jack, the second tank chamber is provided on the inside, and the piston chamber is provided in an area between them, so that the jack itself It can be configured very compactly, and the gas pressure and hydraulic pressure are converted through a deformable bag that divides the first tank chamber into a gas introduction chamber and a hydraulic fluid storage chamber. Pressure/hydraulic pressure conversion is performed efficiently in a relatively narrow area, and since the working fluid storage chamber of the first tank chamber is provided so as to surround the outside of the piston chamber, the piston is compact and compact. It is easy to make the volume of the hydraulic fluid storage chamber equal to or larger than the volume of the chamber, so a sufficient lifting height can be secured, and furthermore, the volume of the hydraulic fluid flow path between the hydraulic fluid storage chamber and the piston chamber can be increased. Since a check valve is installed in the hydraulic fluid, the hydraulic fluid cannot flow back from the piston chamber to the hydraulic fluid storage chamber, and a certain lifting height can be stably maintained. It is possible to provide neutrality.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a cross-sectional view of the jack of the present invention in a contracted state, Fig. 2 is a cross-sectional view of the jack in an extended state, and Fig. 3 is a sectional view of the jack in an extended state similar to Fig. 2. FIG. 4 is a cross-sectional view showing the state when the state is maintained stably; FIG. 4 is a cross-sectional view of the air pressure regulator installed in the jack shown in FIGS. 1 to 3 during air pressure supply; FIG. , FIG. 6 is a sectional view of the air pressure regulator shown in FIG. 4 when air pressure supply is completed, and FIG. 6 is a sectional view of the air pressure regulator shown in FIG. 4 when the air pressure regulator is exhausted and not in use.

As shown in FIGS. 1 to 3, the jack of the present invention preferably has a cylindrical outer housing 10, although it does not necessarily have to be cylindrical.
A tank chamber (first tank chamber) is formed by this and the outer wall surface 22a of the main body 22, and a hydraulic fluid storage chamber 11 is formed inside this tank chamber by a bag 12. It is formed. That is, an air/liquid impermeable flexible bag 12 is placed inside the tank chamber.
Bringing its upper end into close contact with the upper part of the housing 10,
Further, its lower end 14 is attached to the base 15 of the jack in close contact with it, and a hydraulic fluid storage chamber 11 is formed by this bag 12 and the outer wall surface 22a of the main body 22 of the jack. The base 15 and the housing 10 are firmly fixed by appropriate means, thereby forming the outer shape of the main body of the jack. The hydraulic fluid storage chamber 11 includes a hydraulic fluid flow path 16 and 17 in the figure.
A portion 18 of the piston chamber 18 via a check valve shown in
a, so that the hydraulic fluid pressurizes the lower end surface 19a of the piston 19, which will be described below. A sealing member such as an O-ring 19b is preferably attached to the piston 19, and the outer wall surface 2 of the air reservoir (second tank chamber) 24 is attached to the piston 19.
3 and the inner wall surface 22b of the main body portion 22. The piston 19 is preferably made of an annular member, as shown in FIG.
b is fitted so that leakage of hydraulic fluid between the side walls 22b and 23 of the piston chamber 18 can be completely prevented.

Inner wall surface 2 of cylindrical body 25 made of a hollow cylindrical member
5a has a diameter determined so that it can slide on the outer wall surface 23 of the air reservoir 24. A large-pitch thread 25b for supporting the auxiliary cylindrical body 28 is provided on the outer wall surface of the cylindrical body 25, and is adapted to engage with a thread formed on the inner wall surface of the auxiliary cylindrical body 28. As shown in FIGS. 2 and 3, the auxiliary cylinder 28 can be rotated relative to the cylinder 25, thereby causing the cylinder 25 to
It is constructed so that it can be moved telescopically relative to.

Therefore, when pressure is applied to the hydraulic fluid in the hydraulic fluid storage chamber 11, the hydraulic fluid passes from the flow path 16 through the check valve 17 and acts on the lower end surface 19a of the piston, pushing up the piston 19 and pushing it up. At the same time, the cylindrical body 25 and the auxiliary cylindrical body 28 are moved relative to each other upward relative to the other members of the jack. Auxiliary cylindrical body 28
A head 28a is attached to the upper end of the head 28a, and preferably a suitable anti-slip surface is formed on the upper surface of the head 28a. head 28
The shape of a is changed as appropriate depending on the purpose of use.

The interior of the air reservoir 24 communicates with an air pressure regulator (details are shown in FIGS. 4 to 6) through a vent hole 30 and a ball valve 31 portion. The air pressure regulator consists of a cylindrical main body 36 and an air piston 33 housed in its inner cavity 35 (see Fig. 6). An annular groove 34a is formed, and an O-ring 34 fitted therein maintains airtightness with the wall surface of the inner cavity 35. The piston 33 has an inner cavity 38 formed therein, and a protrusion 39 having a circular cross section perpendicular to the axis and having a ventilation hole 39a. The protrusion 39 is inserted into an opening of a washer 41 having an opening 40 larger than its outer diameter.
The tip of the protruding portion is formed to closely fit a portion of the outer shape of the ball valve 31 so that it can come into airtight contact with the ball valve 31 when it comes into contact with the ball valve 31, thereby ensuring the desired airtightness. It's becoming like that.
The pressure in the air reservoir 24 is exerted against the ball valve 31 by the washer 41 and/or the protrusion 3 of the piston 33.
Grants the power to maintain contact with 9.
However, to accurately position the ball valve,
As shown in the figure, it is desirable to provide a compression spring 31a.

An exhaust hole 43 is provided in the wall of the cylindrical main body 36.
is opened to connect the inner cavity 35 with a small chamber 44 formed around the main body portion 36. It is desirable that an annular groove 46 is formed in the outer peripheral wall of the cylindrical main body 36 of the air pressure regulator, and an O-ring 45 is attached thereto. The entire air pressure regulator is secured in the jack base 15 using an annular catch 47 or other known means. The small chamber 44 is connected to the air injection pipe 51 from the ventilation path 50.
It communicates with the gas introduction chamber 52 in the first tank chamber through (see FIGS. 1 to 3). That is, the tip of the air injection tube 51 penetrates through the bag body 12 and reaches into the gas introduction chamber 52, so that the compressed air supplied from the injection tube 51 immediately increases the pressure inside the gas introduction chamber 52. .

The cap 55, loaded with a suitable spring force by a compression spring 56, is slidably fitted into a hole 58 formed in a handle mount 57 fixed to the base 15 of the jack. When the cap 55 is pushed inward, pressure is applied to the rear of the air piston 33 via the spring 56, forcing the piston inward as shown in FIG. is achieved.

In order to push the spring-loaded cap 55 inward, it is convenient to use a handle such as the one shown in FIGS. 1 to 3. That is, in this example, a handle 60 is rotatably mounted, for example, by a pivot pin 61, on a handle mount 57 that is appropriately fixed to the base 15 of the jack. When not in operation, the handle is fixed using a hinge-like locking plate 62 rotatably attached to the jack body by a pivot 63, as shown in FIG. That is, by pushing down the locking plate 62 as shown in FIG. 1 and fitting the snap 64 into the hole provided at the upper end of the handle 60, the handle is held in the non-operating position. In such a non-operating state, the air pressure regulator is in a state as shown in FIG. That is, in the state shown in FIG. 6, after the air pressure inside the small chamber 44 is released into the atmosphere, the piston 33 is in the released state. In contrast, in FIG. 4, the piston 33 is in a state of being pushed inward by the action of the compression spring 56. When the locking plate 62 is pulled upward to remove the snap 64 as shown in FIG. 2, the handle 60 becomes rotatable around the pivot pin 61 and can be pulled to the position shown in the same figure. Become. Although not an essential element, it is preferable that a return spring 6
7 is recommended to apply a force to the handle to return it to the position shown in FIGS. 1 and 3.

A boss 65 is formed at the bottom of the handle 60, and an adjustment screw 66 for adjusting the air pressure is attached thereto. The adjustment screw 66 is configured so that its relative position with respect to the boss 65 can be adjusted by appropriate means. The distal end surface 66a of the adjustment screw 66 abuts the spring-loaded rear end surface of the cap 55 and causes the cap 55 to slide inwardly when the handle 60 is pulled to the position shown in FIG. In this case, the piston 33 is pushed inward in the bore 35 of the regulator main body 36 by the spring 56, and the tip of the protrusion 39 comes into contact with the ball valve 31, causing it to separate from the washer 41. (See Figure 4). Therefore, if the air reservoir 24 is filled with compressed air in advance, the compressed air will flow through the vent hole 3.
0, passes through the ball valve 31 portion, passes through the opening 40, and enters the cavity 35a of the inner cavity 35 of the cylindrical main body 36 of the regulator. The compressed air then further flows into the small chamber 44 through the exhaust hole 43, passes through the air passage 50 and the injection pipe 51, and reaches the gas introduction chamber 52 in the first tank chamber. When it happens,
The pressure inside the gas introduction chamber 52 increases, and the flexible bag 12 deforms as shown in FIG.
The internal pressure also increases, and the hydraulic fluid passes through the check valve 17 from the flow path 16 and enters the piston chamber 18.
Pressure is applied to the bottom surface 19a of the piston. Therefore, the piston 19 moves upwards, thereby causing the cylindrical body 2
5 and the auxiliary cylindrical body 28 also extend upward.

As mentioned above, the piston 33, which is pushed by the cap 55 and subjected to a force directed inwardly (to the left in the figure) via the spring 56, moves its convex head 33
At portion a, the piston receives the action of the air pressure in the cavity 35a, and a force acts on the piston against the force of the spring 56 to push it back in the direction opposite to the ball valve 31. Therefore, the air pressure inside the gas introduction chamber 52 increases, and the force acting on the piston head 33a is increased by the spring 56.
When the force is balanced with and even exceeds the force applied from the rear of the piston, the piston 33 retreats to the right in the figure, and its protrusion 39 also retreats together with the ball valve 31, causing the ball valve to is again seated on the opening 40, blocking the air flow (see FIG. 5). At this time, as long as the handle 60 is in the operating position shown in FIG. 2, the air pressure inside the ventilation path 50, the injection pipe 51, and the gas introduction chamber 52 is maintained as it is. When the handle is returned to the non-operating position as shown in FIG.
slides outward (to the right in the figure) and the piston 33
The spring force is released, and the air pressure inside the gas introduction chamber 52 causes the piston to retreat further, causing the tip of the protrusion 39 to separate from the ball valve 31. In this case, the vent hole 39a in the protrusion is opened and the gas introduction chamber 5 is opened.
2. The compressed air in the small chamber 44, the ventilation path 50, the air injection pipe 51, and the cavity 35a flows through the ventilation hole 3 of the protrusion.
9a, through the inner cavity 38 of the piston, and further through the gap that exists around the cap 55 as it moves, into the atmosphere (FIGS. 6 and 3).
(see figure).

However, in this state, the hydraulic fluid sent into the piston chamber 18 does not flow back to the hydraulic fluid storage chamber 11 side due to the action of the check valve 17, and the jack maintains its extended state (the first (See Figure 2). In order to return the hydraulic fluid to the hydraulic fluid storage chamber 11 and deflate the jack, either open a separate valve (not shown in the figure) provided between the piston chamber 18 and the hydraulic fluid storage chamber 11, or operate the check valve 17 appropriately. All you have to do is provide a means to open it.

In addition, the air piston 3 of the above-mentioned air pressure regulator
3 can be replaced with a kind of partition plate. In that case, an appropriate sealing means is provided on the peripheral edge of the partition plate to maintain airtightness with the inner wall surface of the cylindrical main body 36, and ventilation holes and protrusions (indicated by 39 in the figure) are provided along the axis of the partition plate. (as shown) is provided to perform the same function as the piston 33 described above. The back side of the partition plate is pressed by a spring similar to the spring 56 in the figure.

Further, it is preferable to operate the jack by appropriately operating the handle 60 as described above, but it is not necessarily limited to this. Instead, the handle is fixed and the spring 56
A means for pressing may be provided separately, and this may have the same function as the handle operation.

Although not shown in the drawings, a mechanism such as an injection valve for filling air or other compressed gas into the air reservoir 24 is also provided.

Furthermore, it is recommended that a liquid pump (not shown) for directly pressurizing the hydraulic fluid be installed as an accessory mechanism, so that the jack can be used even in the absence of a source of compressed air. Such an attached pump may be useful in special situations, for example when the compressed air in the air reservoir is exhausted and there is no device at hand for refilling it.

Since the present invention is constructed as described above, the present invention provides a convenient hydro-neumate-take jack that is compact, has a sufficient lifting height, and can stably maintain the lifting height. It is possible.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the jack of the present invention in a contracted state, Fig. 2 is a sectional view of the jack in an extended state, and Fig. 3 is a sectional view of the jack of the present invention in an extended state. A cross-sectional view showing the state when the state is maintained stably, FIG.
3 to 3 are cross-sectional views of the air pressure regulator installed in the jack shown in FIG. 3, FIG. 5 is a cross-sectional view of the air pressure regulator shown in FIG. FIG. 5 is a cross-sectional view of the air pressure regulator shown in FIG. 4 when it is exhausted and not in use. DESCRIPTION OF SYMBOLS 10... Outer housing, 11... Working fluid storage chamber in the first tank chamber, 12... Bag body, 15...
Base, 16... Hydraulic fluid flow path, 17... Check valve, 1
8... Piston chamber, 19... Piston, 22...
Main body, 24...air reservoir (second tank chamber),
25... Cylindrical body, 28... Auxiliary cylindrical body, 31...
Ball valve, 33...Air piston, 36...Cylindrical main body of the air pressure regulator, 39...Protrusion, 51...Air injection pipe, 52...Gas introduction chamber in the first tank chamber, 55...Cap , 56...
Compression spring, 60...handle, 62...locking plate,
66...adjustment screw.

Claims (1)

[Scope of Claims] 1. A hollow cylindrical main body 22; an outer housing 10 that is attached to the outside of the main body 22 and forms a first tank chamber between the main body 22; a gas/liquid impermeable deformable bag body 12 that divides the first tank chamber into a hydraulic fluid storage chamber 11 and a gas introduction chamber 52; a second tank chamber 24 that stores compressed air therein; a piston chamber 18 formed between the inner wall surface 22b of the main body section 22 and the outer wall surface 23 of the second tank chamber 24; a cylindrical body 25 that is movably inserted in the piston chamber 18 along its axial direction so as to be able to move forward and backward in a nested manner relative to the body portion 22, and to support a load to be lifted by a jack; A ring-shaped piston 19 that is movable in the axial direction and fixed to one end of the cylindrical body 25 communicates with the hydraulic fluid storage chamber 11 of the first tank chamber and the piston chamber 18. and the piston 19
a hydraulic fluid flow path 16 that allows the hydraulic fluid to act on the hydraulic fluid flow path 16; and a hydraulic fluid flow path 16 that is provided on the hydraulic fluid flow path 16 and allows the flow of the hydraulic fluid from the first tank chamber to the piston chamber 18, but not in the opposite direction. a check valve 17 for blocking air flow, and a ventilation path 50 for sending compressed air in the second tank chamber 24 to the gas introduction chamber 52 of the first tank chamber.
is provided between the second tank chamber 24 and the ventilation passage 50, and is released based on an external operation when the jack is driven, and the compressed air in the second tank chamber 24 is passed through the ventilation passage 50 to the ventilation passage 50. a pressure regulator that supplies gas to the gas introduction chamber 52 of the first tank chamber and is closed when the pressure within the gas introduction chamber 52 reaches a predetermined value; 2. The air pressure regulator has a cylinder 36,
It consists of an air piston 33 that reciprocates within the cylinder while maintaining airtightness with the cylinder inner wall,
The first end surface of the air piston is formed into a convex shape, and a protrusion 39 is provided at the center thereof, and a bore 38 is bored in the interior of the air piston 33 that penetrates into the protrusion along its axis, and , the protrusion is inserted into an opening 40 of a valve seat provided on the terminal end face of the cylinder, and the tip of the protrusion 39 can be brought into airtight contact with the ball valve 31 loaded with a spring force toward the tip. Further, an exhaust hole 43 communicating with the air passage 50 leading to the gas introduction chamber 52 is bored in the peripheral wall of the cylinder 36, and the air piston 33 is provided with an air piston 33 for reciprocating movement within the cylinder. The hydro-neumate jack according to claim 1, further comprising a manual adjustment mechanism for adjusting conditions. 3. The manual adjustment mechanism of the air piston 33 of the air pressure regulator comprises a compression spring 56 that presses a second end surface of the air piston opposite to the first end surface, and the compression spring 56 Push the air piston 33 in the cylinder 36 toward the valve seat, insert the protrusion 39 of the air piston into the opening 40 of the valve seat, and press its tip against the ball valve 31. The elastic modulus of the compression spring 56 is such that the ball valve is disengaged from the valve seat, and the elastic modulus of the compression spring 56 is such that the pressure within the gas introduction chamber 52 reaches a predetermined value. acting on the first end surface of the air piston to cause the air piston to retract against the force of the compression spring applied to the second end surface thereof, so that the ball valve 31 is seated on the valve seat; Claim 2, characterized in that the value is set such that communication between the second tank chamber 24 and the gas introduction chamber 52 is cut off.
Hydro-neumatake jack as described in section. 4 When the manual adjustment mechanism of the air piston 33 of the air pressure regulator releases the compression of the compression spring 56, the air pressure acting on the first end surface of the air piston causes the air piston to close to the opening of the valve seat. The tip of the protruding part 39 of the air piston is separated from the ball valve 31, and the air pressure in the gas introduction chamber 52 is transferred through the air piston and the inner cavity of its protruding part. The hydro-neumate-take jack according to claim 3, characterized in that it has an exhaust function for emitting air into the atmosphere. 5 It is rotatably attached to the base 15 of the jack in order to operate the above-mentioned air pressure regulator,
Handle 6 movable from non-operating position to operating position
0 and when it is moved to the operating position, the air pressure regulator is activated and the air pressure in the second tank chamber 24 increases to the gas introduction chamber 52.
When the air pressure in the gas introduction chamber reaches a predetermined value, the flow of gas from the second tank chamber to the gas introduction chamber is restricted, and the gas is returned to the non-operating position. When
A handle 60 configured such that the air pressure regulator releases the gas in the gas introduction chamber to the atmosphere.
A hydro-neumate-take jack according to claim 1, characterized in that it is equipped with: 6. The hydro-neumate-take jack according to claim 1, further comprising a manual valve for returning the hydraulic fluid in the piston chamber 18 to the hydraulic fluid storage chamber 11. 7 The air pressure regulator is connected to the compression spring 56.
A compression spring pressing member 55 is provided for applying a compressive force to push the air piston 33 toward the valve seat to separate the ball valve 31 from the valve seat, and the pressing member is attached to the outer wall material of the jack. Claim 3, characterized in that the compression spring 56 is attached so that the force of the compression spring 56 can be applied to the air piston in the cylinder by operating the pressing member 55 from the outside. Hydro Numatake Jyatsuki.