JP3265367B2 - Jack with wedge mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cylindrical casing having a closed bottom, and a hollow rod connected to a lubrication port from the center of the bottom toward the inside of the casing. A piston is attached to the tip of the rod, and a lubrication port is formed near the piston of the rod.The invention relates to a jack having a cylinder slidably provided so as to be sandwiched between the casing and the piston. When holding the load of
The present invention relates to a device having a wedge for fixing a jack and a release means therefor.

[0002]

2. Description of the Related Art Wedges are used as means for preventing steel wires and rods from returning. That is, by driving a wedge into the return preventing portion of the steel wire or the rod, the steel wire or the rod acts to be automatically tightened halfway in the driven direction, thereby preventing the return of the steel wire or the rod.

[0003] In order to loosen the wedge hammered into the return preventing portion of the steel wire or rod, the wedge must be once loosened in a direction in which the wedge is pulled out using a tool or the like. If the wedge is loosened, the movement of the steel wire and rod will be free.

[0004]

By the way, there is a jack composed of a cylinder and a piston. For example, in the case of a hydraulic jack, the operation of raising the piston is performed by applying hydraulic pressure in the cylinder. Can be done. However, after the jack-up, the only way to fix this condition was to continue to apply pressure in the cylinder or to apply another support to the object.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and fixes the state by the jack itself without continuously applying pressure in the cylinder and without applying another supporting means to the object. It is an object of the present invention to provide a jack that can be used.

Prior to solving the above problems, the present inventor found that a wedge mechanism should be provided between the opening of the cylinder and the piston, and conducted various experiments. This is one solution, but in the work of loosening the wedge mechanism, the wedge mechanism, which is largely involved in the tightening between the opening of the cylinder and the piston, is pulled in the direction to pull out the wedge mechanism which is itself tightened. Operation must be performed, which requires a certain amount of force and is a troublesome work, and a new work such as manipulating a tool by sewing between jack members occurs. Another challenge was to make wedge loosening work more difficult.

Regarding this point, the inventor of the present invention devises the wedge mechanism so that the wedge can be pushed in the direction of pulling out the wedge, thereby making it possible to loosen the wedge more easily even with a small force. I obtained the knowledge that it might be.

An object of the present invention is to solve the above-mentioned problems.

[0009]

An object of the present invention is to provide a cylindrical casing having a closed bottom, and a hollow rod connected to a lubrication port from a center of the bottom toward the inside of the casing. A piston is attached to a tip portion of the rod, and an oil inlet is formed near the piston of the rod.In a jack in which a cylinder is slidably provided so as to be sandwiched between the casing and the piston, A wedge slide surface is formed in the opening of the wedge, and a wedge is inserted between the slide surface and the cylinder, and a surface of the wedge facing the cylinder and a surface of the cylinder facing the wedge are formed. And a pressure receiving portion provided behind the wedge is protruded obliquely outward to form the same check protrusion. A piston which can apply a force to the wedge in a direction to disengage the cylinder to pay the piston is provided, it is achieved by a jack which comprises a wedge mechanism comprising oil port is provided in the cylinder.

[0010]

[Action] A wedge is inserted between the slide surface of the opening of the casing and the cylinder to fix the cylinder.
Non-return protrusions are formed on the surface of the wedge facing the cylinder and on the surface of the cylinder opposite the wedge, so that not only the wedge action but also the engagement of the non-return protrusions ensures that this fixing is firm. Become. To loosen the wedge mechanism, lightly jack up and apply hydraulic pressure to push the wedge diagonally outward, and force is applied in the direction of pulling out the wedge and disengaging the non-return protrusions. Can be loosened, which allows the jack to move freely. When the hydraulic pressure is removed, the wedge can be tightened again.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments. In the following embodiments, a hydraulic jack for lifting a heavy object will be described, but the invention is not limited to this.

FIG. 1 to FIG. 5 show a first embodiment of the present invention. A nut 5 is screwed to the bottom of the casing pipe 52, and a hollow rod 51 is provided from the center into the casing pipe 52. The rod 51 is connected to a lubrication port 53 within the nut 5, a piston 50 is attached to the tip of the rod 51, and a lubrication port 55 is formed near the piston 50 of the rod 51. The cylinder 6 is slidably provided so as to be sandwiched between the pipe 52 and the piston 50. In FIG. 1, a guide nut 60 is screwed to an end of the cylinder 6, and the rod 51 is inserted into a center hole of the guide nut 60. A guide 601 is provided on the outer periphery of the cylinder 6 at this position.
A guide 56 is formed in the upper opening of the cylinder 6, an O-ring 602 is provided on the outer periphery of the piston 50, an O-ring 61 is provided on the outer periphery of the guide 601, and an O-ring 57 is provided on the inner periphery of the guide 56. However, O-rings 62 are mounted on the inner and outer circumferences of the guide nut 60 to slidably hold the cylinder 6 and to keep the members between the members liquid-tight. An oil inlet 54 is provided above the nut 5 of the casing pipe 52, and an upper end of the cylinder 6 is provided with a cap 6
It is crowned at 3.

Next, the wedge mechanism will be described. A slide surface 21 for receiving the slide surface 11 of the wedge 1 is formed inside one opening of the cylinder outer wall 2. The wedge 1 comes into contact with the slide surface 21 via the slide surface 11. Outside the mouth, a spring receiver 2
2 is attached to the rear end of the wedge 1 so as to face the rear end of the wedge 1, and a pressing spring 10 for urging the rear end of the wedge 1 in a direction in which the wedge 1 is tightened is attached to the spring receiver 22. The inside of the other opening of the cylinder outer wall 2 has a large inner diameter, and a guide 20 is provided on this inner portion,
A substantially cylinder is formed in this portion, and the inner surface of the guide 20 is formed on the inner surface side of the wedge 1, that is, the sliding surface 11.
It is configured to be flush with the other side. A cylinder is formed by the cylinder outer wall 2 and the guide 20, and the piston 3 is accommodated in the cylinder. A lubrication port 23 is formed in the cylinder outer wall 2 corresponding to the bottom surface of the piston 3 so as to penetrate the cylinder outer wall 2. A pin 30 is provided at the tip of the piston 3, and the pin 30 is attached to the wedge 1.
(See FIGS. 3 to 5).

Although not shown here, the surface of the wedge 1 facing the cylinder 6 and the surface of the cylinder 6 facing the wedge 1 will be described with reference to the configuration of a third embodiment described later. Non-return protrusions that mesh with each other are formed.

Now, as shown in FIGS. 1 and 2,
When hydraulic pressure is applied from the lubrication port 54 with the wedge 1 removed, not the piston 50 fixed by the rod 51 but the cylinder 6 side rises. As a result, the object is jacked up. Therefore, when the wedge 1 is applied, the cylinder 6 cannot return by the action of the wedge 1 even if the hydraulic pressure is reduced.

In order to return the jack to its original position, hydraulic pressure is applied to the lubrication port 23 as shown in FIGS.
Since the cylinder is formed by the cylinder outer wall 2 and the guide 20, the piston 3 moves in the direction of the wedge 1 by hydraulic pressure, the pin 30 of the piston 3 pushes the front end of the wedge 1, and the wedge 1 is further loosened. (See FIG. 5). Although not shown, the check projections formed on the surface of the wedge 1 facing the cylinder 6 and the surface of the cylinder 6 facing the wedge 1 are disengaged from each other, whereby the wedge 1 is released. It becomes. When the oil pressure applied to the lubrication port 23 is weakened,
The wedge 1 returns by the force of the pressing spring 10.

The cylinder and the piston 3 formed by the cylinder outer wall 2 and the guide 20 are part names in the wedge mechanism of the present embodiment, and are distinguished from the cylinder and the piston in the above-described hydraulic jack. Something to be done. In the present embodiment, the pins 30 for pressing the wedge 1 and the piston 3 are given different symbols and names for convenience, but these are basically the same members. The tip portion of the wedge 1 may be called a tip portion as long as it can be pressed by the pin 30 even if it is on the slide surface 11. The pressing spring 10 is a coil spring, but this type is not limited to the coil spring.

In the present embodiment, the jack itself can fix the state without continuously applying pressure from the lubrication port 54 and without applying another supporting means to the object. With the wedge mechanism, it is possible to easily loosen the wedge 1 with a small force. As described above, the effect of this embodiment is that all operations for hanging and loosening the wedge 1 can be performed by remote control. As a result, the operation of jacking up the object or unlocking the wedge 1 and jacking down the object can all be performed remotely. Note that even if a failure such as pressure oil leaks due to the presence of the wedge mechanism, the wedge 1 is working, so that the jack can be prevented from returning suddenly, which is safe. It is also preferable to provide a sensor in the casing pipe 52 or the cylinder 6 so that the rise of the cylinder 6 can be monitored. With this configuration, it is also possible to synchronize the operation of all jacks of a plurality of jacks normally used.

Thus, the jack itself can fix the state without continuously applying pressure from the lubrication port 54 and without applying another supporting means to the object.

Next, FIG. 6 is an explanatory diagram of a second embodiment of the present invention. The jack 7 is characterized in that two wedges 1 and 1 are provided so as to act in opposite directions.
Although not shown in the drawings, a description will be given with reference to a configuration of a third embodiment described later. The non-return check meshes between the surface of the wedge 1 facing the cylinder and the surface of the cylinder facing the wedge 1. A projection is formed. Another characteristic is that the cylinder outer walls 2 are connected by a joint 25 so that the wedges 1 and 1 cannot be reached.

Since the wedges 1 and 1 cannot be reached, the wedges 1 and 1 cannot be released by the conventional means, but can be released in the present embodiment. With respect to such a configuration, the present invention is particularly effective.

Next, FIGS. 7 and 8 show a third embodiment of the present invention. In this embodiment, the side having the check protrusion 42 is a member fixed by the wedge 1, but the check protrusion 12 is also engraved on the surface of the wedge 1 facing the check protrusion 42. The check projections 12 and 42 are shaped so as to act in a direction in which the wedge 1 is tightened. Conversely, the wedge 1 cannot act in the loosening direction.

In the present embodiment, the pressure receiving portion 13 is provided on the back surface of the wedge 1, and the piston 3 is disposed so as to face the pressure receiving portion 13 so as to be substantially parallel to the sliding surface of the wedge 1. It had characteristics. The piston 3 is formed in the cylinder outer wall 2, but is formed in the cylinder outer wall 2.
In the present embodiment, the piston 3 is covered with the guide 20 which forms a part of the cylinder outer wall 2, and the cylinder 3 is substantially formed by the cylinder outer wall 2 alone and the bottom of the cylinder. A lubrication port 23 is formed through the cylinder outer wall 2. Reference numeral 36 denotes a piston head.

Along with this configuration, a spring receiver 22 is attached to the outside of the mouth of the cylinder outer wall portion 2 so as to face the side surface of the wedge 1. The wedge 1 is attached to the spring receiver 22. The pressing spring 10 is attached so as to be urged in the direction of the check protrusion 42 (see FIG. 7).

Here, when hydraulic pressure is applied to the lubrication port 23, since a substantial cylinder is formed in the cylinder outer wall 2, the piston 3 moves toward the pressure receiving portion 13 of the wedge 1 by hydraulic pressure, The head 36 strikes the pressure receiving portion 13 of the wedge 1. As a result, the wedge 1 moves in the loosening direction and is released (see FIG. 8).

When the oil pressure applied to the lubrication port 23 is reduced, the wedge 1 is moved toward the check protrusion 42 by the force of the pressing spring 10, and the check protrusion 12 of the wedge 1 is attached to the check protrusion 42. The wedge 1 is moved in the direction in which the wedge 1 is tightened along the slide surface as it is engaged. In addition, it is also possible to use a simple projection instead of the check projection.

After all, in the present embodiment, the wedge cannot be loosened not only by the action of the wedge 1 but also by the engagement of the check protrusions 12 and 42. Further, a unit capable of applying a force to the wedge 1 in a direction in which the wedge 1 becomes loose also serves as a unit for releasing the engagement between the check protrusions 12 and 42. In any case, in this embodiment, the jack itself can fix the state without continuously applying pressure from the lubrication port and without applying another supporting means to the object. The mechanism makes it possible to loosen the wedge 1 more easily even with a small force.

[0028]

As a result, the present invention states that the jack itself can fix the condition without continuing to apply pressure in the cylinder and without having to assign additional support means to the object. It works.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operation state of the embodiment.

FIG. 3 is a partial explanatory view of the embodiment.

FIG. 4 is an explanatory diagram of an operation state of the embodiment.

FIG. 5 is an explanatory diagram of an operation state of the embodiment.

FIG. 6 is an explanatory diagram of a second embodiment of the present invention.

FIG. 7 is an explanatory diagram of a third embodiment of the present invention.

FIG. 8 is an explanatory diagram of an operation state of the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wedge 10 pressing spring 11 slide surface 12 check protrusion 13 pressure receiving part 2 cylinder outer wall 20 guide 21 slide surface 22 spring receiver 23 lubrication port 24 guide 25 joint 26 joint 3 piston 30 pin 31 O-ring 32 O-ring 36 piston head 42 reverse Stop projection 5 Nut 50 Piston 51 Rod 52 Casing pipe 53 Lubrication port 54 Lubrication port 55 Lubrication port 6 Cylinder 60 Guide nut 61 O-ring 62 G-ring 63 Cap 7 Jack

Continuation of the front page (56) References JP-A-55-21325 (JP, A) JP-A-50-15977 (JP, A) JP-A-58-89597 (JP, A) , U)

Claims (1)

(57) [Claims] The bottom of a cylindrical casing is closed.
Lubrication from the center of the bottom into the casing.
A hollow rod connected to the mouth is provided.
A piston is attached to the tip of the
A lubrication port is formed near the piston of the
Slide the cylinder so that it is sandwiched between the
In jacks that can be freely set,
A sliding surface is formed in the opening to receive the wedge sliding surface
Between the slide surface and the cylinder.
As the bee is inserted, it faces the wedge cylinder
Surface and the surface facing the wedge of the cylinder
A matching check protrusion is formed, and it is installed behind the wedge.
Protrude the pressure receiving part diagonally outward, and
A piston that can apply force to the wedge in the direction of removal and this piston
And a cylinder for storing tons.
With a wedge mechanism.
Ki .