JPS59102800A - Lifting gear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a device for lifting and lowering an object using a direct-acting actuator such as a cylinder, and is particularly suitable for lifting a load when the length of the actuator is restricted. This relates to the above device.

[Prior art]

Conventionally, when lifting or lowering a suspended load by about 1 to 3 meters,
A lifting method in which a lifting rope is operated by a direct-acting actuator such as a cylinder is more commonly used than a hoisting method in which the rope is wound around a drum. However, there was a drawback that it was not possible to install a cylinder suitable for the vertical stroke in places where space was limited. Also, the stroke is 2
If the tube exceeds m or more, there will be restrictions on the production of the cylinder, resulting in a special product that has the disadvantage of lacking in versatility.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to reduce the size of a lifting device that requires a large lifting stroke by using a simple differential mechanism, in order to compensate for the above-mentioned drawbacks.

[Summary of the invention]

The present invention provides a frame, a direct acting actuator installed on the frame, a gear rotatably installed on a movable part of the actuator, a fixed rack meshed with the gear and fixed on the frame, and the A lifting device comprising a movable rack that is engaged with a gear on the opposite side of the fixed rack and is movably installed on the frame, and a lifting rope that is connected to and installed on the movable rack, the hoisting device comprising one of the racks. The rack is fixed, and the other rack is movable, so that the amount of movement of the movable rack is twice the amount of movement of the gear moved by the actuator.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4. Figure 1 shows a railway vehicle equipped with a crane. A trolley 1 freely supported from a crane poom 7 moves the cargo 2 by raising it by a stroke 3, and lowers it by a stroke 4 at the unloading position.

In the case of railway vehicles, due to the vehicle limit 5 shown in FIG. 2, the space 6 constituting the trolley 1 in a crane vehicle as shown in FIG. 1 becomes extremely small, and as shown in FIG. Currently, the running wheels of the vehicle must be constructed by recessing them. In this case, the space for adding a lifting device for the cargo 2 is limited because the pool 7 and the trolley 1 are close to each other and there is a vehicle limit 5 regulation, so the position of the direct-acting cylinder 8 can be freely determined. I can't do it.

However, the lifting and lowering stroke of the cargo requires about 3 to 3.5 m, and in order to cover this stroke with a cylinder, a special cylinder with a long rod 9 is required, and this was adopted in Trolley 1 due to both cylinder manufacturing and holding space. is difficult. Therefore, in this embodiment, the cylinder 8 is mounted horizontally on the trolley 1 due to space limitations, as shown in FIG. 4, and the differential gear 10 is mounted on the tip of the rod 9, which is the movable part of the cylinder 8, so that it can rotate freely. Of the two racks 11 and 12 that mesh with this gear lO, the rack 11 is fixed to the trolley 1. The other rack is mounted on a trolley 13 installed so that it can be moved within the trolley 1. A rope 14 is attached to this trolley 13, and this loaf 14 hangs down from a rope sheep 15 attached to the trolley 1, and a load 2 is attached to the lower end. In this configuration, if the rod of the cylinder 8 moves by a stroke of 8 dimensions, the trolley 13 will move by a dimension of b (=2Xa), so the cargo 2
can be raised and lowered by an amount twice the stroke of the rod 9 of the cylinder 8 (dimension b). Therefore, a small-sized lifting device capable of lifting the load 2 with a large lifting amount is obtained.

〔Effect of the invention〕

As described above, according to the present invention, a fixed rack and a moving rack engage and sandwich a gear, and the gear is moved by the stroke motion of a direct-acting actuator, thereby raising and lowering the gear more than the stroke of the actuator. Since the lifting amount can be applied to one load, it is possible to obtain a small-sized lifting device that can apply a large lifting amount to the load.

[Brief explanation of the drawing]

FIG. 1 is an elevational view showing the working situation of a railway crane truck according to an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, and FIG.
The figure is an enlarged view of the main part of FIG. 2, and FIG. 4 is a sectional view taken along the line AA in FIG. 3. 1...Trolley, 2...Luggage, 5...
...Vehicle limit, 8...Cylinder, 9...
...Rod, 10...Differential gear, 11.1
2...Rack, 13...Dolly, 14.
...low, s, -6
50-14

Claims (1)

[Claims] 1 a frame, a direct acting actuator installed on the frame, a gear rotatably installed on a movable part of the actuator, a fixed rack meshed with the gear and fixed to the frame, and a fixed rack installed on the frame; A lifting device comprising a movable rack that engages with the fixed rack on the opposite side and is movably installed on the frame, and a lifting rope that is connected and installed to the movable rack.