JPS638040B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic jack, which is capable of being raised relative to a guide rod and which is capable of pulling the guide rod upwards, i.e., capable of being raised and lowered.

In general, hydraulic jacks for lifts are equipped with upper and lower engaging elements that mesh with the vertically installed rod, and the engaging elements are directed upward by the reciprocating movement of the piston of the hydraulic device, and one side is engaged alternately, and the other is engaged. While separating the rod, the hydraulic system is raised along the rod, and the heavy object is raised by the jack. This kind of jack has been used for various purposes for a long time, but when we look at the state in which a heavy object is raised with such a jack, when the heavy object is raised along the rod together with the jack hydraulic system, the heavy object is lowered downward. The rod has been left standing from the foundation for a long time. In this case, when a heavy object is fixed in a raised position, it may be necessary to raise the rod extending to the lower foundation surface and perform processing such as pouring concrete on the foundation surface.
In such a case, the rod cannot be pulled up with this type of jack.

The jacking device of the present invention is a jacking device that can not only lift heavy objects, but also can stop the lifted heavy objects in the raised position and pull up the rod that passes through the jacking device from the base. a hollow cylinder having a cylindrical through hole, bottomed upper and lower engagement claw holding boxes disposed above and below the cylinder with the central axes of the through holes coinciding with the through holes, respectively; The cylinder consists of a guide rod that is inserted into a through hole, and the cylinder includes a piston rod that slides in contact with the outer wall of the cylinder of the cylindrical through hole, and a guide rod that is fixed to the piston rod and extends along the outer wall and the inner wall of the outer cylinder of the hollow cylinder. The piston has a built-in sliding piston, the upper engaging claw holding box is installed on the cylinder, and the lower engaging claw holding box is fixed to the tip of the piston rod protruding from the cylinder to prevent movement of the piston. Therefore, the engaging claws are moved close to and away from the lower part of the cylinder, and each of the engaging claw holding boxes selectively engages a pair of upper and lower engaging claws and a corresponding one of the upper and lower engaging claws with the guide rod. It is characterized by housing a means to do so.

An embodiment of the apparatus of the present invention will be shown below with reference to the drawings. The cylinder 1 has an axial through hole 2, and a pressure chamber is formed between the cylinder 3 of the through hole and the outer cylinder 4 of the cylinder. Between the outer wall of the cylinder 3 and the inner wall of the outer cylinder 4, a piston 5 is slidable along the inner and outer walls, and a piston rod 6 is inserted from the piston.
extends downwardly through the bottom 7 of the cylinder. At the top and bottom of the cylinder, upper and lower engaging claw holding boxes 8 and 9 are arranged, respectively, with through holes 10 and 11 aligned with through hole 2. The upper engaging claw holding box 8 is fixed to the cylinder 1 with a member of a predetermined length, such as a bolt 12, and the lower engaging claw holding box 9 is fixed to the lower end of the piston rod 6 by screwing or other methods. . Each of the holding boxes has a bottom and the structure is almost the same, so
I would like to talk about Jobu Mochitada. The inner wall along the through hole 10 is cylindrical at approximately the center 13, and has upper and lower inclined surfaces (conical surfaces in this case) 15, 14 so that the upper and lower ends of the cylindrical portion converge toward the cylindrical portion, respectively. Each conical surface has an upper engaging claw 19 and a lower engaging claw 17 of a notched cone whose inner surfaces are hooked surfaces 18 and 16, respectively.
However, the outer peripheral surfaces are inclined surfaces 15 and 1 on the upper and lower sides, respectively.
4 is placed so as to be able to slide, and each of the engaging claws is mutually pressed toward the central cylinder 13 by upper and lower coil springs 21 and 20 attached in contact with the upper and lower bottoms of the holding box. There is. The cylindrical portion 13 is further provided with a cylindrical locking piece 35, and a handle 36 is provided on the locking piece so as to penetrate through the casing. The above-mentioned engaging pawl has a structure in which a hollow cone is divided into at least 30 parts around the axis, and the converged portion forms an inwardly inclined surface, and has a shape that makes it easy to meet the outwardly inclined surface of the cylindrical locking piece 35. It is better to have Regarding the hook surfaces 16 and 18, in consideration of engagement with the illustrated cylindrical guide rod 40 inserted into the through hole during use, the hook surfaces 16 are formed in a direction that engages with the rod and prevents it from sliding off the rod. It is preferable that the hook surface 18 is formed in a direction that prevents the rod from slipping off when it engages with the rod and pushes it up. Each member of the lower holding box 9 is indicated by a number obtained by adding "10" to each member of the upper holding box 8. Nao 22, 22
32 is a spring retaining flange, and a mechanism corresponding to 22a is formed at the end of the piston rod 6 at 32a. Reference numerals 33 and 34 indicate pressurized oil supply ports provided on the upper and lower flanges of the cylinder. The locking handle 36 slides through a U-shaped through groove 37 provided in the wall of the gripping box as shown in FIG.
5 presses one of the engaging claws 19 against the pressure of the spring 21, the locking piece is rotated around the axis and the handle 36 is moved to the curved part 38 of the groove perpendicular to the axis and fixed. let

First, the lifting action of the device of the present invention will be described. As shown in FIG. 1, the upper and lower locking handles 36, 46 are operated upward to engage the locking pieces 35, 45, and the upper engaging claws 19, 29 are moved against the pressure of the springs 21, 31, respectively. When held down, the engaging claws 19, 29 will be attached to the guide rod 40.
On the contrary, the engaging claws 17 and 27 engage with the rod. This state is assumed to be A, _A1 engagement, and the third, fourth,
In Fig. 5, the position is shown as ><A, ><A ₁ . When the cylinder 1 is supplied with oil from the oil supply port 33 in this state, the piston rod 6 moves downward from the state shown in FIG. 3 to the state shown in FIG. In this case, in the lower holding box 9, the engaging claw 27 engages with the rod 40 by the A engagement, so that the cylinder 1 relatively moves up along the rod. In this case, the engaging pawl 17 is structured to prevent it from moving downward along the rod in relation to the inclined surface 14, but not from moving upward, so that it rises from its original position in FIG. Engages with the rod in the raised position (4th
figure). Next, when pressure oil is applied to the cylinder from the oil supply port 34, the piston moves up inside the cylinder, and the lower holding box 9 moves up along the rod (5th
figure). In this case as well, in the _upper holding box 8, the engaging claw 17 engages with the rod 40 and prevents it from moving downward along the rod, so the jacking device does not descend along the rod. . In addition, in the case of the lower holding box 9, in the A engagement, the engaging pawl 27 prevents downward movement along the rod due to its relationship with the inclined surface 24, but does not prevent upward movement, so that the engaging claw 27 does not prevent the downward movement as shown in FIG. The holding box moves to a higher position than in Figure 4 and stops. By repeating the above operations, the jacking device rises along the rod like an inchworm.

Next, the action of raising the jack to a predetermined position, stopping it, and pulling up the rod extending downward will be described. Here, when the handles 36 and 46 are respectively moved downward and fixed, the locking pieces 35 and 45 move the engagement claws 17 and 27 downward against the spring pressures 20 and 30, respectively, to release the engagement with the rod and reverse engaging claw 1
9 and 29 engage with the rod. In this case, the engagement between the lower holding chamber 9 and the upper holding chamber 8 will be referred to as ><B, _B1 engagement, respectively, like the above-mentioned A and _A1 engagements. B, B ₁
When pressurized oil is applied to the cylinder from the oil supply port 33 during engagement, the piston rod 6 moves downward to the position shown in FIG. Contrary to the above, engagement B prevents the case 9 from moving upward along the rod 40 but does not prevent it from moving downward, so the extension of the piston rod 6 causes the holding case 9 to move downward along the rod. move. In this case, the upper holding box 8 does not move along the rod because it is engaged with the rod 40 and the jacking device or cylinder is in a rest position. Next, when pressure oil is supplied into the cylinder 1 from the oil supply port 34,
The piston rod 6 moves up inside the cylinder as shown in FIG. 7, and the lower holding box 9 also approaches the cylinder accordingly. In this case, the engagement claw 29 of the lower holding box 9 grips the rod 40 due to the B engagement, and as the lower holding case 9 rises, the rod 40 is raised (the seventh
6), the base plate 41 of the rod is raised from the position shown in FIG. By repeating the above operations, the rod can be raised. In this case, the engagement between the engaging pawl and the rod is a frictional engagement, and the engagement is possible at any position along the rod, so if the piston 5 is within the stroke range, the lifting stroke of the jack relative to the rod can be controlled. It is also possible to change.

The present invention provides two sets of engaging pawls in the upper and lower engaging pawl holding chambers, which engage with the guide rod in response to relative movement in one direction and the other direction, respectively. Since it is designed to prevent the engaging pawl on the opposite side from engaging with the rod, it is not only possible to raise the jack itself by any step relative to the guide rod, but also to prevent the engaging pawl on the opposite side from engaging with the rod. By activating , you can pull the rod into the jack. However, the operation is extremely easy to perform. Therefore, it is highly useful as a jack suitable for repeating the work of first lifting the machine to a high place along the rod, then pulling up the rod and pouring concrete in the raised area.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the hydraulic jack of the present invention, Fig. 2 is an elevational view of the locking handle protrusion on the outer surface of the engaging pawl holding box, and Figs. 3 to 7 show the jack operation sequence. FIG. 1: cylinder, 2: through hole, 3: cylinder, 4: outer cylinder, 5: piston, 6: piston rod, 8,
9: Engaging claw holding box, 10, 11: Through hole, 13,
23: Cylindrical inner surface, 14, 15; 24, 25: Inclined surface, 17, 19; 27, 29: Engagement claw, 20, 2
1; 30, 31: Spring, 35, 45: Locking piece, 4
0: Guidance rod.

Claims (1)

[Scope of Claims] 1. A hollow cylinder 1 having a cylindrical through hole 2 in the axial direction, and cylinders arranged above and below the cylinder, with the central axes of the through hole 2 and the through holes 10 and 11 being aligned, respectively. It consists of an upper engaging claw holding case 8 and a lower engaging claw holding case 9 at the bottom, and a cylindrical guide rod 40 inserted into the corresponding through hole, the cylinder being an outer wall of the cylinder 3 of the cylindrical through hole. A piston 5 is fixed to the piston rod and slides along the outer wall and the inner wall of the outer cylinder 4 of the hollow cylinder. The lower engaging claw holding box is fixed to the tip of the piston rod protruding from the piston, and moves toward and away from the lower part of the cylinder as the piston moves, and each of the engaging claw holding boxes has an inner surface penetrated. The inner surface of the cylinder 13, 23 is concentric with the axis of the hole, and the upper and lower inclined surfaces 15, 14 and 25, 26 converge toward the inner surface on both sides in the axial direction of the inner surface of the cylinder,
Further, each of the engaging claw holding cases has a pair of upper and lower engaging claws 19, 17 and 29, 2 that slide along each inclined surface.
7, springs 21, 20, 31, 30 that press the engaging claws in the converging direction along the inclined surface, and slide along the inner surfaces of the cylinders 13, 23 against the pressure of the springs to form a pair. A locking piece 35, 45 for engaging one of the engaging claws with the guide rod, and a through groove 37 provided in the wall of each holding box for allowing the locking piece to selectively slide from the outside. A hydraulic jack that can be raised and lowered, characterized in that it has handles 36 and 46 of each of the locking pieces provided at the same time. 2. Each of the engaging claws is characterized in that the inner surface thereof is a hook surface that engages with the rod, and the outer surface is a surface that slides along an inclined surface. A hydraulic jack that can be raised and lowered according to claim 1. 3. According to claim 1, the locking piece has a shape in which an axial end face can engage face-to-face with the engaging pawl, and the through groove 37 is U-shaped with a bent portion 38 perpendicular to the axis. Hydraulic jack that can be raised and lowered as described.