JPS622236Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a column for a manual swing type crane that can prevent the crane from unexpectedly turning in the opposite direction to the turning direction.

In small cranes, the column is normally rotated manually, but if the clamp is loosened during this process, depending on how uneven the load is, it may unexpectedly rotate in the opposite direction to the operator's intention, resulting in a serious accident. It was causing it.

Therefore, by incorporating two sets of one-way clutches, this invention not only ensures safety by restricting turning in directions other than the intended direction, but also serves as a clamping mechanism, positioning mechanism, etc. The column was provided.

Hereinafter, specific embodiments of this invention will be described with reference to the drawings.

Figure 1 is a side view of a crane truck incorporating a column according to this invention.The crane truck has a flat loading platform 1, an operating section 2 equipped with an engine and various operating levers in the upper front part, and a crane section 3 in the center. , and has a running section 4 that runs downward.

A sleeve 5 is made to stand upright on the crane part 3, a column 6 is rotatably fitted into the sleeve 5, and a boom 7 is made to extend laterally at the top of the column 6. Hydraulic cylinders 8 and 9 are provided for extending and retracting the boom 7 and for raising and lowering the boom 7, respectively, and a hook 10 for lifting a load is suspended from the tip of the boom 7.

By the way, this invention incorporates two sets of one-way clutches 11 and 11' between the column 6 and the sleeve 5.

FIG. 2 is a longitudinal sectional view of the column 6 and sleeve 5, and FIGS. 3 and 4 are respectively taken along the line X--X in FIG.
They are an X' sectional view and a YY' sectional view.

A flange 12 is formed on the column 6, and this part is attached to a metal 13 incorporated in the upper end of the sleeve 5.
It is weight-supported and is also supported by bearings. Although not shown, a similar metal is also fitted near the lower end of the sleeve 5 and supported by a bearing.

One-way clutch 11,1 is located near the middle of column 6.
1' is in the opposite direction and is fixedly installed using a key 14 or the like to transmit rotational force. Note that these one-way clutches 11,
11', the axial movement of the column 6 is also restricted by the collar 15 and the step of the column 6.

Next, pins 16, 16' lock and free the rotation of these one-way clutches 11, 11'.
is incorporated into the sleeve 5. i.e. pin 1
The tips of the clutches 6 and 16' are designed to fit between the teeth 11a and 11'a of the one-way clutches 11 and 11', and when they are inserted, they are locked, and when they come out, they are free. Therefore, the pins 16, 16 are always held in the radial direction of the sleeve 5 by the springs 17, 17'.
It is configured to be able to slide freely while being biased inward by the lever, and knobs 18, 18' are provided at the rear end so that pushing and pulling operations can be performed using the knobs 18, 18'. In order to keep the column 6 free to rotate by retracting the pins 16 and 16',
A locking pin 19, 19' is provided in the middle of the pin 16, 16', and this portion is pulled out from the sleeve 5, so that the pin 16, 16' itself rotates slightly and is hooked on the end face of the sleeve 5.

If both pins 16 and 16' are now pushed inward, the rotation of the column 6 will be locked in both clockwise and counterclockwise directions. and one pin 16
When you pull out the pin 1, it rotates counterclockwise and the other pin 1
When 6' is pulled out, clockwise rotation becomes possible, so the operator performs this operation as appropriate while monitoring the work status.

Further, such operations can also be performed centrally near the driver's seat. Figure 5 is an example.
Wires 20, 2 linked to pins 16, 16'
0' and locking protrusion 2 of the operating lever 21.
2, 22'.

When the operating lever 21 is turned from A to B in FIG. 5, the wire 20' is pulled, the pin 16' is removed, and the column 6 can be rotated counterclockwise.
Additionally, a lock fitting 23 for locking the operating lever 21 is provided.
Also provided.

As described above, this invention uses two sets of one-way clutches 1 between the column 6 and the sleeve 5 in the column of a manual swing type crane with the boom 7 extended horizontally at the top.
1 and 11' are installed in opposite directions.

Therefore, first, these one-way clutches 11,
11' and pins 16, 16', etc., will ensure that turning in a direction other than the intended direction is locked, so even if an unbalanced load is applied, there will be no possibility of unexpected turning to that side. , workers can perform rotation work with peace of mind. These locking and freeing operations are easy and simple since they only require pushing and pulling the pins 16, 16'.

In addition, since the two sets of one-way clutches 11, 11' can be made with the same shape but with the front and back sides reversed, they can be manufactured at low cost.

Furthermore, since the one-way clutches 11 and 11' can serve as both a clamping device and a positioning device for the column 6, these devices can be eliminated, and from this point of view as well, various excellent effects such as cost reduction can be expected.

[Brief explanation of the drawing]

Figure 1 is a side view of a crane truck incorporating a column according to this invention, Figure 2 is a vertical sectional view of its main parts, Figure 3 is a sectional view taken along line X-X' in Figure 2, and Figure 4 is the same. The Y-Y' sectional view and FIG. 5 are plan views of the operating lever portion. Code, 5...Sleeve, 6...Column, 7...
Boom, 11, 11'...One-way clutch.

Claims (1)

[Scope of utility model registration request] In a column 6 of a manual swing type crane with a boom 7 extended horizontally at the top, between this column 6 and a sleeve 5 that is provided upright on the machine body and into which the column 6 is inserted, The present invention is characterized in that two sets of one-way clutches 11 and 11' are installed in opposite directions, and that each clutch is provided with a control means that can freely engage and disengage the clutches so that they can rotate independently and freely. crane column.