JPS606879B2 - Boom extension device for multi-stage telescoping boom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a boom telescoping device for a multi-stage telescoping boom such as a crane hoom, and particularly for a multi-stage telescoping boom in which at least three telescoping booms are sequentially inserted into a base boom.

Conventionally, the multi-stage telescoping boom is telescopically operated using a telescopic cylinder or a plurality of telescoping cylinders, or
Alternatively, multiple telescoping booms are individually telescoping manually, but relying on multiple telescoping cylinders not only becomes extremely expensive, but also increases the weight of the entire multi-stage telescoping boom and supports it. Another problem is that the power required for the telescopic operation is large, and if it is done manually, it requires a great deal of labor and time, making it extremely inefficient.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a boom extension device for a multi-stage telescopic boom that can easily extend the multi-stage boom using only a single telescopic cylinder, is easy to handle, and is low-cost. It is something to do.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The multi-stage telescopic boom B includes a base boom 1 and first, second and third telescopic booms 2 and 3 telescopically inserted into the base boom 1 in sequence.
and 4. The base end of a hydraulic cylinder 5 is connected to the base end of the base boom 1', and this hydraulic cylinder 5 extends forward along the base boom, and its piston rod tip is connected to the tip of the first telescopic boom 2. It is connected to a bracket 6 fixed to.

Further, a connecting piece 7 is integrally formed at the tip of the bracket 6, and a pin hole 8 is bored in the connecting piece 7. A connected piece 9 that can be engaged with the connecting piece 7 is fixed to the upper part of the tip of the second telescopic boom 3.
A pin hole 10 is bored in the , and by inserting the connecting pin P into this pin hole 10 and the pin hole 8 of the connecting piece 7,
The first telescopic boom 2 and the second telescopic boom 3 can be connected together.

A U-shaped support piece baking soda that slidably supports a stopper bar 15, which will be described later, is fixed to the lower surface of the base boom turtle. On the bottom surface of the tip of the third telescopic boom 4, there are fixed to the bottom of the tip of the third telescopic boom 4, respectively, a treasure-shaped Sun Dishikata Takagong Fuo and a crane turtle. A single stopper that can be formed longer than the maximum extension of the turtle can be selectively locked.

The three locking pieces 29, 29, and 29 each have a pin hole, a member's head, and a weight.

One pin hole 9 is drilled at the rear end of the stopper, and three pin holes 8, 21 and 2 are provided at the tip at intervals in the length direction. is drilled,
By inserting the connecting pin section into the pin hole of the locking piece 2 and the pin hole at the rear of the stopper, the stopper 5 can be connected to the base boom member. 2. By selectively inserting the connecting pin P into the three pin holes 20, 2nd and 22 at the tip of the stopper rod 5, the stopper The pin hole 21 and base 2 can be selectively connected to the second or third telescopic boom 37 and the rudder. The locking piece 139 provided at each tip constitutes the engaged portion of the present invention that can be locked with Futoshi.A pin hole 23 is bored at the tip of the first telescopic boom 2. Pin holes 249 and 25 that can match the pin holes 23 are bored in the base end and the tip of the second telescopic boom 3.
By inserting the connecting pin P into 9 24, the second telescopic arm 3 can be secured in the extended position.
The second telescopic boom 3 can be secured in the retracted position by inserting a connecting pin P into the second telescopic boom 3. In addition, a pin hole 26 is bored at the tip of the second telescopic boom 3, and pin holes 28 that can match the pin hole 26 are formed at the base and tip ends of the third telescopic boom 4. It is drilled and has 267 pin holes.
The third telescopic boom 4 can be secured in the extended position by inserting the connecting pin P into the pin hole No. 27, and the third telescopic boom tortoise can be secured in the retracted position by inserting the connecting pin P into the pin hole No. 26 and 28. A winch 29 is installed at the base end of the base boom, and the hook groove S is connected to the hook groove S via a pulley 3 supported at the tip of the third telescopic boom. It's hanging. Next, the operation of the embodiment of the present invention will be explained mainly with reference to FIGS. 2a to 2g.

In addition, in order to make it easier to understand in the harp diagram, even if the connecting pins are the same, they are marked with serial numbers (1st edition...g) according to the order in which they are operated. The second umbrella figure shows the multi-stage telescopic boom crane in the most contracted state, with the first telescopic boom bonito, the second telescopic boom 3, the second telescopic boom 3 and the third telescopic boom turtle'
They are connected to each other by inserting connecting pins P and P2, respectively, and the tip of the stopper S and the third telescopic boom crane are integrally connected by a connecting pin P3. Now, from the state shown in Figure A, if you extend the telescopic sill ring after removing the connecting pins P and P2, the first telescopic boom 2 will extend as one with the second t and third telescopic boom 39. In addition, this causes the stopper to be pulled forward and pulled out by the third telescopic boom.As shown in Figure b, the connecting pin P is attached to the connecting piece as shown in Figure b.
4 and connect it to the second telescopic boom 2?3 with its connecting pin P4, and also connect the rear end of the stopper 6 with the tip of the base boom neck using the connecting pin P5 to connect the base boom. and the third telescopic boom tortoise are connected through the stopper camphor 51. When the telescopic cylinder 5 is retracted, the third telescopic boom 4 is extended as shown in FIG. ? 3 are both retracted.Next, as shown in Fig. 2, the connecting pin P6 is inserted into the tip of the second telescoping boom 3 and the base end of the third telescoping boom turtle to connect them together. If the connecting pin P3 is pulled out and the telescopic cylinder flea is extended again, the second telescopic boom 3 and the third telescopic boom 4) will extend together.As shown in Fig. 2e, the second telescopic boom After connecting the base boom member and the second telescopic foot 3 with the stopper rod 15 by inserting the connecting pin P7 into the locking piece turtle 3 of No. 3 and the tip of the stopper rod 15, the telescopic cylinder 5 is contracted. If the tip of the first telescopic boom 2 and the base end of the second telescopic boom S are connected to the connecting pin P8, the second telescopic boom 3 is secured to the extended position as shown in Figure 2.Finally, the connection is made. After both pins P5 and P7 are removed, the stopper pivot is moved backward, supported by the support piece 11 of the base boom turtle and the locking piece 2, and the stopper pole turtle 5 is fixed by the connecting pin P9. After that, by extending the telescopic cylinder 5 again, the first telescopic boom 2 can be extended, as shown in Fig. 2g.
As shown in FIG. 3, the first and third telescoping booms 2, 3 and 4 can all be extended.

If the above operations are performed in reverse, the multi-stage telescopic boom B can be retracted following the sequence shown in FIG. 2 g to a.

Further, the multi-stage telescopic boom B may be contracted by winding the lifting wire 30. In addition, in the above embodiment, the case of a multi-stage telescopic boom consisting of three telescopic booms was explained.
It is also possible to have four or more telescopic booms.

As described above, according to the present invention, the base boom has at least three
In a multi-stage telescopic boom formed by telescopically inserting two telescopic booms in sequence, a hydraulic cylinder may be connected between the base boom L and a first telescopic boom immediately before the base boom. is provided with a connecting piece that can be connected to the second telescopic boom immediately before the first telescopic boom, and furthermore, a single stopper rod that is longer than the maximum extension of each telescopic boom is provided at the tip of the base boom. A locking member capable of removably locking one end thereof is provided, and a locking member is provided at each tip of the remaining telescoping boom except for the first telescoping boom, and a locking member is provided at the end of the stopper rod at intervals in the length direction thereof. Since locking members that can be removably locked to at least two of the provided engaged parts are provided, all that is required is to perform the respective reach/disengage operations between adjacent telescoping booms and between each boom and stopper shank. A multi-stage telescoping boom can be extended by the telescoping action of a single telescoping cylinder, thus eliminating the troublesome and high cost of operation that would be required when using a conventional telescopic cylinder or multiple telescoping cylinders. The multi-stage telescoping boom can be easily and easily extended one after another without expending excessive labor and time as in the case of conventional manual operation. In particular, in the present invention, in order to extend the distance between adjacent telescopic booms, the one stopper bar that restricts the contraction of the telescopic boom on the tip side when the telescopic cylinder is retracted is provided.
Since it can be used commonly for each telescopic boom, there is no need to prepare multiple stopper rods with different lengths depending on the maximum extension amount of each telescopic boom (excluding the first telescopic boom), which reduces costs. Not only can this contribute to reducing the amount of damage caused, but since there is no need to replace the stopper rod during the boom extension process, the handling of the stopper rod can be performed extremely quickly and easily. No worries. As described above, according to the present invention, only the relatively simple and labor-intensive insertion/removal operation of the connecting pin and the sliding operation of one stopper rod are performed, and the multi-stage operation is performed by the telescopic operation of a single telescopic cylinder. Since the telescopic boom can be extended and operated, there is no need for troublesome and costly operation, which is required when using a conventional telescopic cylinder or multiple telescopic cylinders, and there is no need for the conventional manual operation. To easily and easily extend a multi-stage telescopic boom in sequence without expending excessive labor and time.

[Brief explanation of the drawing]

Fig. 1 is a side view of a part of a multi-stage telescopic boom equipped with the device of the present invention, Fig. i' is a side view of a stopper lever, and Figs. 1... Basic boom, 2... First telescopic boom as a telescopic boom, 3... Second telescopic boom as a telescopic boom, 4... Third telescopic boom as a telescopic boom. Boom, 5... Hydraulic cylinder as telescopic cylinder, 12, 13, 14
...Latching piece as a locking member, 15... Stopper bar, 21, 22... Pin hole as an engaging part, B...
Multi-stage telescopic boom. Fig. 1 Fig. 1' Fig. 2 Diamond

Claims (1)

[Claims] In a multi-stage telescopic boom formed by telescopically inserting at least three telescopic booms into a base boom in sequence, a hydraulic cylinder is connected between the base boom and a first telescopic boom immediately before the base boom, At the tip of the telescopic boom,
A connecting piece that can be connected to the second telescopic boom immediately in front of the first telescopic boom is provided, and one end of a single stopper rod that is longer than at least the maximum extension of each telescopic boom is detachably attached to the tip of the base boom. A locking member capable of being locked to the stopper rod is provided at each tip of each of the remaining telescopic booms other than the first telescopic boom. 1. A boom telescoping device for a multi-stage telescoping boom, characterized in that a locking member that can be removably locked to each engaged portion is provided.