JPS5943358Y2 - 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,
A turnbuckle structure as shown in Japanese Patent No. 6-10832 is conventionally known.

) Until the folding of the auxiliary jib 3 is completed, pin receiving holes 9 are formed in a pair of upper and lower brackets 5 at the head of the tip boom 2 and in a pair of upper and lower brackets 15 at the base of the auxiliary jib 3. The pin head 1a is fitted through a pair of upper and lower pin receiving holes 19.

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 7a is
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. The tip boom 2 can only be extended and retracted by fixing it to the side and pulling out the head 7a of the connecting pin 1 from the pin receiving hole 19 on the auxiliary jib 3 side, but in the past, this pin head was often If you forget to pull out the tip boom 2 or extend or retract the tip boom 2 while the connection between the tip boom 2 and the auxiliary jib 3 is not completely released, or if you forget to pull out the tip boom 2 or the auxiliary jib 3 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 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 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, the auxiliary jib folding device of the present invention will be explained with reference to each illustrated embodiment.
Example, Figures 9 to 12 are the same second example, and Figure 13.
Figures 1 to 16 show the third embodiment, and in each of these figures, reference numeral 1 indicates a proximal boom, 2 indicates a distal boom,
3 is an auxiliary jib, 4 and 5 are brackets formed on the head of the tip boom 2, and 6 and 1 are the auxiliary jib 3 attached to the tip boom 2.
Each of the connecting pins 6.7 is a telescopic connecting pin for connecting to the head of the
It has the same structure as the turnbuckle type described in the publication.

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 indicates a horn member (hereinafter referred to as a light horn) formed at the tip of the auxiliary jib 3, and symbols A to F refer to the horn member (hereinafter referred to as a light horn) formed at the tip of the auxiliary jib 3. 1 shows a support device for fixing to.

Next, the details of the structure of each embodiment will be explained. In the first embodiment, when supporting the auxiliary jib 3 on the side surface of the base end boom 1, a support device A as shown in FIG. Furthermore, a support device B as shown in FIG. 1 is formed at the tip of the auxiliary jib.

The above support device A includes a horn member (hereinafter referred to as a horizontal horn) 22, which is attached to the side surface of the auxiliary jib main body 13, to the horn receivers 25a, 25a of the plate-shaped horn receiver 25 welded to the side surface of the base end boom 1. 22 is inserted therein.

There is some wobble between the horn receivers 25a, 25a and the horizontal horns 22.22, allowing the horizontal horns 22 to tilt left and right within the horn dog cage 5a.

Further, the support device B has a box-shaped horn receiver 24 welded to the side surface of the base end boom 1 to receive the tip horn 21 of the auxiliary jib 3.

The tip horn 21 is movable in the horizontal direction in a horn receiver 24a in the horn receiver 24, and can be fixed with a pin 27 when it moves toward the proximal boom 1 (solid line state in Figure 1). It has become.

For this purpose, a pin receiver 26 or 29 is formed on the horn receiver 24 and the front horn 21, respectively, as shown in FIG.

In this embodiment, the auxiliary jib 3 is initially in a state substantially parallel to the proximal boom 1 as shown in FIG.
is inside the horned pet dog 5a, and the first horn 21 is inside the horned reception 24
Fit into a.

Furthermore, in this state, if the connecting pin 1 is retracted so that its head 7a comes out of the pin receiving hole 19 at the base end of the auxiliary jib, the connection between the tip boom 2 and the auxiliary jib 3 is released, so that When the auxiliary jib 3 is rotated about the horizontal horn 22 with respect to the proximal boom 1 as shown in FIG. 9 and the bracket 15 at the base of the auxiliary jib and its pin receiving hole 19 are released.

In this case, if the connecting pin 7 is connected to the bracket 1 on the auxiliary jib side,
If the pin is not completely removed from the pin receiving hole 19 of No. 5, the auxiliary jib 3 will not be able to turn around the horizontal horn 22, and the operator will be able to immediately sense the situation.

After turning the auxiliary jib 3 as shown in FIG. 5, the tip horn 21 is fixed to the horn support 24 using the pin 2T as shown in FIG. can be supported on the sides.

In addition, when rotating the auxiliary jib 3 with respect to the proximal boom 1, insert the bar 12 between the two as shown in FIG. 17, and pull it in the direction of the arrow to rotate the auxiliary jib 3 It is good to move.

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) 15.15,
) engages with the connecting pin 7, thereby causing 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 second embodiment will be described. In this embodiment, supporting devices C and D are used to support the auxiliary jib 3 on the side surface of the proximal boom 1, but the supporting devices are different from those in the first embodiment. Same as B (see Figures 7 and 8)
Therefore, the support device C will be explained below.

In order to configure this support device C, a pair of upper and lower roller supports 31 are provided on the side surface of the base end boom 1 as shown in FIG.
31 is welded, and a roller support 3L is attached to the side of the auxiliary jib 3.
A roller 34 that can fit into the roller socket 32° 32 of 31
(Fig. 12) is installed.

In FIG. 12, reference numerals 33, 33 are brackets for supporting the roller 34 vertically.

In the second embodiment, the roller 34 becomes the turning center for the auxiliary jib 3, and as in the first embodiment, the auxiliary jib 3 is moved from a state substantially parallel to the proximal boom 1 (FIG. 9) to a base position. The end boom 1 is pivoted to a tilted state (FIG. 10) with respect to the side surface, whereby the bracket 5 and its pin receiving hole 9 at the end boom head and the bracket 15 and its pin receiving hole 19 at the base of the auxiliary jib are connected. depolymerize.

Next, a third embodiment will be described. In this embodiment, supporting devices E and F are used to support the auxiliary jib 3 on the side surface of the proximal boom 1.

The support device E is constructed as shown in FIG. 15, and the support device F is constructed as shown in FIG. 16.

In FIG. 15, reference numeral 41 denotes a shelf member welded to the bottom surface of the proximal boom 1, on which the auxiliary jib 3 is mounted.

Reference numeral 42 denotes a vertical horn receiver welded to the side surface of the shelf member 41, and the horn member 44 attached outwardly to the lower part of the auxiliary jib 3 can be received within the horn supporter 2a.

Reference numeral 43 is a pin holder welded to the side surface of the shelf member 41, and has a pin receiving hole 43a for receiving a pin 46, which will be described later.

Reference numeral 45 has a pin receiving hole 45a for receiving a pin 46 in a bottle holder attached to the lower part of the auxiliary jib 3.

In FIG. 16, a tip bracket 48 is shown between two upper and lower brackets 47 and 4γ welded to the side surface of the base end boom 1.
is mounted so as to be rotatable left and right by a shaft 49.

In this embodiment, in the first step (FIG. 13), the tip horn 21 is inserted into the tip horn receiver 48, and then the auxiliary jib 3 is inserted into the tip horn receiver 48.
When moved laterally in the manner illustrated in the figure, the auxiliary jib 3 rotates around the tip support 48 (FIG. 14).
At that time, the horn members 44, 44 in the support device E part fit into the horn holder 2a of the horn receiver 42, and at the same time, the pin receiver hole 43a of the bottle receiver 43 on the shelf member 41 side and the bottle receiver on the auxiliary jib 3 side. Since the gold 45 pin receiving hole 45a overlaps in the vertical direction, both pin receiving holes 43a.

A pin 46 is inserted into 45a and fixed.

In the state shown in FIG. 14, the overlapping of the bracket 5 and its pin receiving hole 9 at the tip boom head and the bracket 15 and its pin receiving hole 19 at the auxiliary jib base is released.

Also in the second embodiment and the third embodiment, the head 7 of the connecting pin 7
Since the auxiliary jib 3 cannot be rotated when the pin a has not come out of the pin receiving hole 19 of the bracket 15, the operator can immediately sense the situation and can prevent forgetting to remove the connecting pin 7.

Next, to explain the effects of this invention, the following (1) and (2)
) is as follows.

(1) The auxiliary jib 3 must be rotated against the side of the proximal boom 1 to release the coaxial overlapping of the pin receiving hole 9 at the tip boom head and the pin receiving hole 19 at the base of the auxiliary jib. Since it cannot be fixed on the side of the base end boom 1, it is easy to fix the auxiliary jib 3 without removing the connecting pin 7, which may cause damage to the connecting pin 7 or the bracket part. Accidents can be prevented.

(2) As the auxiliary jib 3 rotates, 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.
Even if the tip boom 2 is retracted while the 0 is hoisted, the bracket 5 on the tip boom 2 side and the bracket 15 on the auxiliary jib 3 side are unlikely to collide, and accidents involving damage to these brackets that have occurred in the past can be avoided. There is a preventive effect.

[Brief explanation of drawings]

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. 4 is a partially omitted plan view of the telescopic boom and the auxiliary jib in the first embodiment of the present invention, FIG. 5 is a state change diagram of the auxiliary jib in FIG. 4, and FIG. 6 is a side view showing the auxiliary jib. is an enlarged perspective view of the auxiliary jib support device A shown in FIGS. 4 and 5, FIG. 7 is an enlarged perspective view of the auxiliary jib support device B, and FIG. 8 is a cross section taken along ■-■ in FIG. 9 is a partially omitted plan view of the telescopic boom and auxiliary jib in the second embodiment of the present invention, FIG. 10 is a state change diagram of the auxiliary jib in FIG. 9, and FIG. 11 is shown in FIG. 9. 12 is a view in the direction of the Y arrow of the roller shown in FIG. 14 is a state change diagram of the auxiliary jib in FIG. 13, FIG. 15 is an enlarged perspective view of the auxiliary jib support device E shown in FIGS. 13 and 14, and FIG. 16 is a plan view with parts omitted. FIG. 17 is an enlarged perspective view of the auxiliary jib support device F and is an explanatory diagram of the turning operation of the auxiliary jib. 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 horn, A-F... 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, while the auxiliary jib 3 is connected to the auxiliary jib 3 using the connecting pin I as a support shaft.
is foldable along the side surface of the proximal boom 1, and between the proximal boom 1 and the auxiliary jib 3, the distal end boom 2 can be folded along the side surface of the proximal boom 1 with the auxiliary jib 3 folded. When the auxiliary jib 3 is contracted to the maximum with respect to The end portion is pivotable in a direction perpendicular to the side surface of the proximal boom 1 around the tip or intermediate portion of the auxiliary jib 3, and is further provided in the boom side pin receiving hole 9 and the auxiliary jib side pin receiving hole 19. Auxiliary jib support devices A, B, C, . ..., and furthermore, when the base end of the auxiliary jib 3 is rotated relative to the side surface of the base boom 1, the tip boom side pin receiver is provided to receive the connecting pin 7 serving as the support shaft. The coaxial overlap between the hole 9 and the auxiliary jib side pin receiving hole 19 is released, and the auxiliary jib 3 maintains the coaxial overlap release state with respect to the base end boom 1 in the coaxial overlap release state. An auxiliary jib folding device characterized in that the auxiliary jib is fixed in place.