JPS6011909Y2 - Auxiliary jib folding device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a folding device for an auxiliary jib installed in a telescopic boom type crane.

Figure 1 shows a conventional telescopic boom type crane in which the auxiliary jib 3, which is detachably attached to the head of the tip boom 2 of the multi-stage telescopic boom unit, is folded along the side of the base boom 1. As shown, in this type of auxiliary jib folding device, two connecting pins 6.
One of the connecting pins 7 is used as a rotation shaft.

This connecting pin 7 is vertically expandable and retractable (
For example, as a connecting pin with this telescoping function,
Until the folding of the auxiliary jib 3 is completed (a turnbuckle structure as shown in Japanese Patent No. 6-10832 has been known), the upper and lower brackets 5 formed on the pair of upper and lower brackets on the head of the tip boom 2 are closed. The pin head 7a is fitted through a pair of pin receiving holes 9 and a pair of upper and lower pin receiving holes 19 formed in a pair of upper and lower brackets 15 at the base of the auxiliary jib 3.

Note that when the auxiliary jib 3 is folded on the side surface of the proximal boom 1 and supported by the jib support devices Y and Z as shown in FIG. 2, the connecting pin 7 is contracted and its head 7
a is pulled out from the pin receiving hole 19 on the side of the auxiliary jib 3, thereby releasing the connection between the tip boom 2 and the auxiliary jib 3.

In this way, the tip boom 2 can be extended and retracted only by fixing the auxiliary jib 3 to the proximal boom 1 side and pulling out the head 7a of the connecting pin 7 from the pin receiving hole 19 on the auxiliary jib 3 side. However, in the past, this pin head 7
If you forget to pull out the tip boom 2 or extend or retract the tip boom 2 without fully releasing the connection between the tip boom 2 and the auxiliary jib 3, this may cause the connection pin 7 and the auxiliary jib 3 to be removed. There was an accident that damaged the Y part of the jib support device.

Furthermore, in the conventional crane, even if the connection between the tip boom 2 and the auxiliary jib 3 is completely released, the load 10 is suspended, that is, the tip boom 2 is slightly tilted downward, as shown in FIG. When the proximal end boom 1 is pulled into the proximal boom 1 in a lowered state, there is a problem in that the bracket 5 on the distal end boom 2 side collides with the bracket 15 on the auxiliary jib side.

The above-mentioned problems with conventional cranes occur when the auxiliary jib 3 is in the same position as when it is separated from the tip boom 2, that is, the pin receiving hole 9 on the tip boom 2 side and the auxiliary jib 3
This is due to the fact that it is supported on the base end boom 1 side in a state where the side pin receiving holes 19 are coaxially overlapped.

The present invention was made in view of the above problem, and when folding and fixing the auxiliary jib 3 to the side surface of the proximal boom 1, the pin receiving hole 9 on the tip boom 2 side and the pin on the auxiliary jib 3 side are The auxiliary jib 3 cannot be fixed if the receiving hole 19 overlaps coaxially with the auxiliary jib 3.
It is an object of the present invention to provide an auxiliary jib folding device in which the auxiliary jib 3 cannot be fixed to the proximal boom 1 unless the auxiliary jib 3 is completely removed from the side pin receiving hole 19.

Hereinafter, embodiments of the present invention will be described with reference to the illustrated embodiments. In FIGS. 4 to 9, reference numeral 1 indicates a proximal boom;
is the tip boom, 3 is the auxiliary jib, 4 and 5 are the tip boom 2
The brackets 6 and 7 are formed on the head of the auxiliary jib 3.
These connecting pins 6.7 are extendable connecting pins for connecting the head of the tip boom 2 to the head of the tip boom 2, and each of these connecting pins 6.7 is
The structure is similar to the turnbuckle type described in Publication No. 6-1083.

Further, numerals 8 and 9 are pin receiving holes formed in the brackets 4 and 5 (for receiving the heads of the connecting pins 6 and 7), 13 is the jib main body, and 14 and 15 are the bases of the auxiliary jib 3. The brackets 18 and 19 formed on the bracket 14.
21 is a horn member (hereinafter referred to as the "tip horn") formed at the tip of the auxiliary jib 3;
Reference numeral 8 indicates a tip receiver for receiving the tip tip 21, and symbols A and B indicate support devices for fixing the auxiliary jib 3 to the proximal boom 1.

The support device A is configured such that the roller 25 is attached via a gap 26 to a shelf member 23 (FIGS. 6 and 7) welded to the lower surface of the proximal boom 1 so as to project laterally, while the roller 25 is attached to the auxiliary jib body. A latch 22 that engages with the roller 25 is attached to the lower surface of the roller 13.

The roller 25 was supported at both ends by support pieces 24.24, and the width of the latch 22 (in the transverse direction of the auxiliary jib main body) was made to be slightly smaller than the spacing between the support pieces 24.24 so that the latch 22 could fit into the gap 26. I try not to let it rattle around too much inside.

Further, the support device B is constructed by welding a tip receiver 28 having a tip receiving plate 29 for receiving the tip tip 21 of the auxiliary jib 3 to the side surface of the proximal end boom 1, as shown in FIG. There is.

Pin receiving holes 3 are provided in the tip receiver 28 and the tip tip 21, respectively.
1 or 32 are formed, and these pin receiving holes 31.
If the pin 30 is inserted in the coaxial state of 32, the tip 2
1. As a result, the entire auxiliary jib 3 is fixed in its axial direction.

In this embodiment, in the first stage (FIG. 4) in which the auxiliary jib 3 is folded onto the side surface of the proximal boom 1, the bracket 5 at the tip boom head and its pin receiving hole 9 are connected to the bracket 1 at the base of the auxiliary jib.
5 and its pin receiving hole 19 are in a vertically overlapping state, respectively.

In addition, the latch 22, the roller 25, and the pin receiving hole 3 of the tip 21
2 and the pin receiving hole 31 of the tip socket 28 are in a non-aligned or non-overlapping state.

Furthermore, in this state, if the connecting pin 7 is contracted so that its head 7a comes out from the pin receiving hole 19 on the auxiliary jib side, the connection between the tip boom 2 and the auxiliary jib 3 is released, so that When the jib 3 is moved in the axial direction of the proximal boom 1 as shown in FIG. 5, the bracket 5 of the distal boom 2 and its pin receiving hole 9, which had been vertically overlapped until then, and the bracket 15 of the auxiliary jib base are removed. And its overlap with the pin receiving hole 19 is released (FIG. 10).

In this case, if the connecting pin 7 is connected to the pin receiving hole 1 on the auxiliary jib 3 side,
9, the auxiliary jib 3 cannot move in the axial direction, so the operator can immediately sense the situation.

After the auxiliary jib 3 has been moved as shown in FIG. 5, the front horn 21 is fixed to the front horn receiver 28 using the pin 30 as shown in FIG.

At this time, the latch 22 attached to the lower surface of the auxiliary jib main body 13 engages with the roller 25, so that the auxiliary jib 3 cannot move in the axial direction, vertically, or horizontally.

In addition, in order to move the auxiliary jib 3 in the axial direction of the proximal boom 1, as shown in FIGS. Attach a pair of pins 33 and 34 so that they match, and insert a bar 35 (
(Fig. 9) and mark it with the chain line 35' as shown by the arrow.
Operate the auxiliary jib 3 to the position shown by the lever action.
to be moved.

In addition, the pin receiving hole 1 formed in the bracket 15 of the auxiliary jib 3
When fitting the connecting pin 7 to the auxiliary jib bracket 15.9, the fork-like member 40.
40 engages with the connecting pin 7, thereby connecting the pin receiving holes 9, 9 on the tip boom side and the pin receiving holes 19, 19 on the auxiliary jib 3 side.
are in a coaxial state.

Next, the effects of the present invention will be explained as follows (1) to (3).

(1) The auxiliary jib 3 must be moved in the axial direction of the proximal boom 1 to release the coaxial overlapping of the pin receiving hole 9 on the tip boom head and the pin receiving hole 19 on the auxiliary jib base. Since the end boom 1 cannot be fixed on the side, there is no need to fix the auxiliary jib 3 while forgetting to remove the connecting pin 7, and the end boom 2 is not extended or retracted while forgetting to remove the connecting pin. Accidents of damage to the connecting pin 7 and each bracket part caused by this can be prevented.

(2) As the auxiliary jib 3 moves, the vertical overlap between the bracket 5 at the tip boom head and the bracket 15 at the base of the auxiliary jib is also released.
Bracket 5 on the tip boom 2 side and bracket 1 on the auxiliary jib 3 side are
There is no collision between the brackets and the brackets 5, and the damage accidents that have conventionally occurred to these brackets can be prevented.

(3) The movement of the auxiliary jib 3 toward the base end of the boom has the effect of increasing the hanging capacity of the crane, albeit slightly.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the head of a conventional boom telescoping crane, Figure 2 is a partially omitted plan view of the telescopic boom and auxiliary jib shown in Figure 1, and Figure 3 is a telescopic boom with a suspended load. FIG. 4 is a partially omitted plan view of the telescopic boom and the auxiliary jib in the embodiment of the present invention, and FIG. 5 is a side view showing the auxiliary jib.
FIG. 6 is an enlarged perspective view of the auxiliary jib support device A shown in FIGS. 4 and 5 as viewed from the X arrow, and FIG. Fig. 8 shows the auxiliary jib support device B shown in Figs. 4 and 5.
FIG. 9 is an explanatory diagram of the movement operation of the auxiliary jib, and FIG. 10 is an enlarged perspective view of the tip boom head after the auxiliary jib has been moved. 1...Base end boom, 2...Tip boom, 3...Auxiliary jib, 4, 5...Bracket, 6,7...・Connection pin, 8, 9...
Pin receiving hole, 14, 15...Bracket, 18,
19...Pin receiving hole, 21...Tip, A
, B...Auxiliary jib support device.

Claims (1)

[Scope of utility model registration request] Pin receiving holes 9 and 19 are formed at the tip and side of the tip boom 2 and the base and side of the auxiliary jib 3 which is detachably attached to the tip of the tip boom 2, and a pin on the tip boom side. The receiving hole 9 and the auxiliary jib side pin receiving hole 19 are coaxially superimposed with each other, so that a common connecting pin 7 can be removably fitted therein, and the auxiliary jib 3 can be inserted into the auxiliary jib 3 using the connecting pin 7 as a support shaft.
can be freely folded along the side surface of the proximal boom 1, and between the proximal boom 1 and the auxiliary jib 3, the tip boom 2 can be folded along the proximal side with the auxiliary jib 3 folded. When the auxiliary jib 3 is fully retracted relative to the boom 1,
The weight of the auxiliary jib 3 is carried by the proximal boom 1 by engaging with the auxiliary jib 3, and in the supported state of the auxiliary jib 3, the auxiliary jib 3 is movable in the axial direction of the proximal boom 1. When the connecting pin 7 is fitted into the boom side pin receiving hole 9 and the auxiliary jib side pin receiving hole 19, the auxiliary jib 3 is movable together with the tip boom 2 in its extension direction. a support device A supporting 3;
Further, when the auxiliary jib 3 is moved in the proximal direction with respect to the proximal boom 1, the distal boom side pin receiving hole 9 for receiving the connecting pin 7 serving as the support shaft and the distal boom side pin receiving hole 9 are provided. Coaxial overlapping with the auxiliary jib side pin receiving hole 19 is released, and in the state where the coaxial overlapping is released, the auxiliary jib 3 is immovably fixed to the base end boom 1 at least in its longitudinal direction. An auxiliary jib folding device characterized by: