JPH024512B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for extending and storing a supplementary jib in a wheel crane such as a truck crane or a rough terrain crane.

The supplementary jib that is attached to the telescopic boom of a wheeled crane has a truss-type cantilever jib with a truss structure, and a large number of connecting rods between the side rods, which are made of a pair of square pipes, etc., and the overall structure is tipped. There are two types of suspension rod supported compression column type jibs (hereinafter simply referred to as truss type jibs and compression column type jibs), which are formed into a flat shape. The latter compression column type jib is considered advantageous. On the other hand, there are generally two methods for storing the supplementary jib: a bottom-holding type in which the jib is folded onto the lower surface of the boom, and a side-holding type in which the jib is folded on the side surface of the boom. In both of these storage methods, in the case of the lower holding type, the vertical thickness due to the boom and jib becomes larger, so visibility during traveling is reduced.
In particular, side visibility is reduced. In addition, if you try to improve visibility, the overall height of the crane vehicle will increase, which also poses a problem when traveling. On the other hand, in the case of the side-carrying type, although the side visibility is widened, the thickness in the left-right direction is also large, which poses a problem in that it makes it difficult to turn on narrow running roads.

Conventionally, in order to ensure both side visibility and the ability to run in narrow spaces, when using a compression column type jib, we have taken into consideration the ability to run in narrow spaces and have adopted a lower-hugging retraction system, while using a truss type jib. In some cases, a side-hugging storage system is adopted to improve side visibility.
In the end, the reality is that there are still problems with one of them, so it is not a fundamental solution.

The present invention was made in view of the above circumstances, and
When the jib is retracted, both the vertical and lateral thicknesses can be reduced to a minimum, ensuring both side visibility and maneuverability in narrow spaces when driving.In addition, when the jib is retracted, the posture is suitable for normal driving. The purpose of the present invention is to provide a device for extending and retracting a supplementary jib in a wheeled crane, which allows selection of two retracting positions, one suitable for short-term travel such as on-site movement, and the other suitable for short-term travel.

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show the jib in its retracted state, FIGS. 3 and 4 show it in the first stage of jib extension, and FIGS. 5 and 6 show it in its fully extended state. Note that Figures 3 and 4 also show a temporary storage state during short-term travel such as when moving to a site, and hereinafter this state will be referred to as a temporary storage state (or temporary storage posture),
The states shown in FIGS. 1 and 2 are referred to as normal storage states (or normal storage postures).

Reference numeral 1 designates a telescopic boom, 2 a suspension rod supporting compression column type supplementary jib (hereinafter simply referred to as a jib), and 3, 3 a suspension rod.
In order to make the explanation easier to understand, here, a case is shown in which the telescoping boom 1 is constructed as a one-stage telescoping type consisting of a base end boom 1A which is a fixed boom and a distal end boom 1B which is a movable boom. Of course, the invention is also applicable to two-stage or three-stage telescoping booms. In addition, the left and right direction below refers to the direction seen from the driver's seat with the jib in the extended state shown in Figures 5 and 6, and up and down refers to the vertical relationship when the boom 1 and jib 2 are viewed horizontally in the same extended position. say. As is well known, the jib 2 has a large number of connecting rods 2c, which are also made of square pipes, fixed between a pair of left and right side rods 2a, 2b, which are also made of flat square pipes, etc., and the jib 2 has the shape of a flat frame with a tapered end. is formed.

Horizontal boom point pins 4 and 5 having foot pin insertion holes 4a and 5a are protrudingly provided on both left and right sides of the tip of the boom 1, that is, the tip of the tip boom 1B (boom point), and are provided with horizontal boom point pins 4 and 5 that have foot pin insertion holes 4a and 5a. The left and right feet 6, 7 are engaged with the boom point pins 4, 5. As shown in FIG. 7 and elsewhere, the jib feet 6 and 7 on both sides are formed in fork shapes that can be engaged with and disengaged from the boom point pins 4 and 5 along the jib axis direction, respectively, and the foot pins are inserted in a direction perpendicular to the jib axis direction. Holes 6a and 7a are provided.

As shown in FIGS. 1 and 2, when normally stored, the jib 2 is folded along the left side of the base end boom 1A in a vertical position with its thickness direction facing left and right. is fixed to the proximal boom 1A at two locations, the distal end and the proximal end. First, the fixing structure of the jib tip will be described. A tip engagement pin 9 is provided in a horizontal position protruding from the side of the tip sheave block 8 of the jib 2 in a horizontal position along the jib axis direction. Reference numeral 10 denotes a tip fixing mechanism provided on the left side of the proximal end of the proximal boom 1A in correspondence with the engagement pin 9, and as shown in FIGS. A movable bracket 12 is provided. The fixed bracket 11 has a U-shaped cross section with openings on both sides and the left side in the boom axis direction, and the movable bracket 12 is attached to the horizontal shaft 1 at the tip (left end) of the fixed bracket 11.
It is pivoted so that it can be raised and rotated around 3. The tip engaging pin 9 of the jib 2 is connected to the tip fixing mechanism 10 when the jib 2 is normally stored or temporarily stored.
is housed and supported within the fixed bracket 11 of the
It is confined within the fixed bracket 11 by the movable bracket 12 set in the upright position. Further, the fixing bracket 11 is provided with a lock pin hole 11a extending in the vertical direction, and the engaging pin 9 is provided with two lock pin holes 9a and 9b crisscrossing in the vertical and horizontal directions. By inserting the lock pin 14 into the hole 11a, 9a or 11a, 9b, the tip engaging pin 9 is fixed to the fixing bracket 11 during normal storage or temporary storage. 15 is a pin for locking the movable bracket 12 in an upright position.

Next, to explain the jib base end fixing mechanism, there are brackets 16a, 1 on both left and right sides of the upper surface of the jib base end.
Two base end engaging pins 16, 16 are fixed along the jib axial direction via 6a. Reference numeral 17 denotes a base end fixing mechanism provided on the left side surface of the tip end of the base end boom 1A in correspondence with the pins 16, 16;
As shown in the figure, a fixed bracket 18 extends horizontally from the boom 1A, and a movable bracket 18 is pivoted at the tip (left end) of the fixed bracket 18 so as to be able to rise and fall around a horizontal axis 19. bracket 20
The movable bracket 20 has engaging pin holes 21 and 2 into which the proximal end engaging pins 16 and 16 can engage.
1 is provided. Numeral 22 is a lock pin for locking the movable bracket 20 in the upright position and the lying position; 23 and 24 are lock pin holes into which the lock pin 22 is inserted; and 16b and 16b are the engagement pins 1.
6,16 This is a pin to prevent it from coming off. The base end engaging pins 16, 16 are inserted into the engaging pin holes 21, 21 of the movable bracket 20 when the jib 2 is in the normal retracted position shown in FIGS. 1 and 2 and in the temporary retracted position shown in FIGS. 3 and 4.
to fit. In the normal storage position, the movable bracket 20 is erected, and the base end of the jib 2 is placed and supported on the fixed bracket 18.

On the other hand, the boom 1 is provided with an overhanging sheave 26 that rotates around a vertical axis above the distal sheave block 25 of the distal end boom 1B, and an auxiliary winding wire as an overhanging wire is provided on the upper surface of the intermediate portion of the base end boom 1A. A guide sheave 27 is provided to be passed through. In addition, in the middle part of the jib 2, the right rod 2
A guide hook 28 is provided at b. Reference numeral 26a denotes an auxiliary sheave that is provided immediately behind the overhanging sheave 26 and rotates around a horizontal axis.

However, when explaining the procedure for extending jib 2,
When the jib 2 is normally stored, as shown in Figs.
Place it on the left side of the base end boom 1A in a vertical position with a facing down. In this state, the distal end engaging pin 9 is fixed by the distal end fixing mechanism 10 as described above at the distal end of the jib, and the jib 2 is supported by the fixing bracket 18 of the proximal fixing mechanism 17 at the proximal end. , and by fixing the proximal end engaging pins 16, 16 to the movable bracket 20, the jib 2 is fixed in the normal retracted state in the vertical position.

To extend the jib 2 from this normal storage position, the crane main body's outriggers (not shown) are extended to stabilize the aircraft, and the boom 1 is directed horizontally to the side or rear of the aircraft. (a) Pull out the auxiliary winding wire 29 along the boom 1 from the auxiliary winding winch (not shown) mounted on the crane body as shown in FIG.
9 through the overhanging sheave 26 and the auxiliary sheave 26a at the tip of the boom, the guide sheave 27
From there, it is connected to the tip of the jib 2 via a guide hook 28.

(b) In the tip fixing mechanism 10 shown in FIGS. 8 and 9, remove the lock pin 14 that fixes the engagement pin 9, and remove the pin 15 that locks the movable bracket 12 in the upright position, as shown by the imaginary line in FIG. The bracket 12 is tilted to a horizontal position as shown.
In addition, the proximal end fixing mechanism 1 shown in FIGS.
At step 7, the locking pin 22 that locks the movable bracket 20 in the upright position is removed.

(c) Next, by gradually loosening the auxiliary winding wire 29, the jib 2 is rotated 90 degrees to take a horizontal position as shown by the imaginary lines in FIGS. 13 and 14 and FIGS. 10 and 11. In this state, the jib 2 has the distal end engaging pin 9 supported by the fixing bracket 11 of the distal end fixing mechanism 10 at the distal end, and the proximal engaging pins 16 at the proximal end in a horizontal position. The proximal end fixing mechanism 17 that has fallen down is placed and supported on the movable bracket 20 in a state where it is fitted into the engagement pin holes 21, 21 of the movable bracket 20.

(d) At this point, the left jib foot 6 is separated from the left boom point 4. Therefore,
Swing the jib 2 in the above state using the middle part as a fulcrum in a direction in which the tip part moves away from the base end boom 1A, engage the left jib foot 6 with the left boom point pin 4 as shown in FIG. The foot pin 30 is inserted into the foot pin insertion holes 6a, 4a of the boom point pin 4 and the boom point pin 4 to connect the two. Note that the lock pin 14 of the tip fixing mechanism 10 may be used as the foot pin 30.

(e) After that, as shown in Fig. 15, the rod members 31, 31 are suspended between the sheave block 25 of the tip boom 1B and the intermediate part of the jib 2, and the jib is secured by the rod members 31, 31. Supports 2. Further, the auxiliary winding wire 29 is removed from the guide sheave 27 and the guide hook 28, and stretched directly from the overhanging sheave 26 to the tip of the jib.

(F) Extend the boom 1 until the engagement pins 16, 16 at the base end of the jib are disengaged from the movable bracket 20 of the base end fixing mechanism 17. At this time, the auxiliary winding wire 29 is unwound as the boom 1 extends so that a constant slight tension is always applied.

(g) After setting the jib 2 in a state where it can be turned laterally, gradually wind up the auxiliary winding wire 29,
Then, while raising and lowering the boom 1 slightly, move the jib 2 to the left boom foot pin 3 as shown in Fig. 16.
Rotate 180° to the side around 0.

(H) After rotating the jib, engage the right side jib foot 7 with the right side boom point pin 5 as shown in Fig. 17, and insert the right side boom foot pin 32 into the foot pin holes 7a, 5a of both 7, 5. .

(l) After this, remove the rod member 31 while supporting the jib 2 with the auxiliary winding wire 29.

(J) Install suspension rods 3 and 3 between the tip boom 1B and jib 2. Although not shown, the suspension rods 3, 3 are stored in the jib 2 when not in use.

(Ru) Finally, as shown in Fig. 18, loosen the auxiliary winding wire 29 and connect the wire 29 to the tip boom 1B.
The sheave block 25 is passed through a boom point idler sheave (not shown) to the jib point sheave block 8 at the tip of the jib, and the auxiliary hook 33 is attached to the tip.

In the above manner, the extension of the jib 2 is completed.

Further, the jib 2 can be stored in the completely opposite procedure to the above-described procedure for extending the jib 2. In this case, the jib 2 is basically stored in the normal stowed position (vertical position) shown in Figs. In other words, if side visibility or running in narrow spaces is not a big problem, set jib 2 to 3rd or 4th position.
It can be kept in the temporarily stored position (horizontal position) shown in the figure. This will save you the trouble of retracting it, and will also be advantageous for later extension work. In addition,
In this temporarily stored state, in the distal end fixing mechanism 10, the lock pin 14 is inserted between the pin hole 11a of the fixing bracket 11 and the pin hole 9b of the engagement pin 9. Further, at this time, one or both of the auxiliary winding wire 29 and the rod member 31 may be left set.

In addition, when the jib is small and lightweight like a rough terrain crane, the above-mentioned auxiliary winding wire 29
It is also possible to manually change the posture of the jib 2 from the normal storage position to the temporary storage position to the extended position, or vice versa, without using the This will be simplified.

As described above, according to the present invention, the jib can be stored along with the boom in a vertical position with its thickness direction facing left and right. The total thickness dimension can be reduced to a minimum. Also, of course, the thickness in the vertical direction can be reduced to a minimum, which is only the thickness of the boom. Therefore, it is possible to simultaneously ensure side visibility while driving and maneuverability in narrow spaces. Furthermore, according to the present invention, the jib can be held in a temporarily stored state along the boom in a horizontal position, so the two stored positions, the normal stored position and the temporary stored position, can be selected as appropriate depending on the conditions. This makes it possible to streamline the work of extending and retracting the jib.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which FIG. 1 is a side view of the jib in a normally stored state, FIG. 2 is a plan view of the same, FIG. 3 is a side view of the jib temporarily stored, and FIG. 4 is a plan view of the same. Fig. 5 is a side view of the jib in its extended state, Fig. 6 is a plan view of the same, Fig. 7 is an enlarged perspective view of the jib foot section, Fig. 8 is an enlarged view of part A of Fig. 1, and Fig. 9 is the same as Fig. 8. 10 is an enlarged sectional view along the line 2, FIG. 11 is a sectional view taken along the line 10, and FIG. 12 is a schematic side view showing the jib in its ready state. , Fig. 13 is a schematic side view of the jib in the temporarily retracted position, Fig. 14 is a partially enlarged plan view showing the left jib foot engaged and connected to the boom point pin, and Fig. 15 is a schematic side view of the jib in the temporarily retracted position. FIG. 16 is a schematic side view of the jib with the members attached; FIG. 16 is a schematic plan view of the jib rotated to the extended position; FIG. 17 is an enlarged side view of the right jib foot in the same state; FIG. FIG. 3 is a schematic side view of the fully extended state. 1... Telescopic boom, 1A... Proximal boom (fixed boom), 1B... Tip boom (movable boom), 2
...Jib, 3,3...Suspension rod,
4, 5... Boom point pin, 6, 7... Fork-shaped jib foot, 9... Jib tip engagement pin, 10... Jib tip fixing mechanism, 11... Fixing bracket of the same mechanism, 12... Movable bracket, 16, 16...Jib base end engagement pin, 17
... Jib base end fixing mechanism, 18... Fixed bracket of the same mechanism, 20... Movable bracket of the same, 21,
21... Engaging pin hole, 31, 31... Rod member.

Claims (1)

[Claims] 1.Equipped with a telescoping boom consisting of a fixed boom and a movable boom, and a suspension rod support compression column type refill jib that is added to the tip of the telescoping boom, and when the refill jib is extended, its thickness direction faces upward or downward. A supplementary jib for wheel-type cranes in which the fork-shaped left and right jib feet are engaged with boom point pins in a horizontal position, and the tip and base ends are fixed to the side of the boom in a vertical position with the thickness direction facing left and right when stored. overhang,
The storage device includes an engaging pin fixedly installed at the distal end and the proximal end of the jib toward the distal end side of the jib, and the engaging pins at both the distal end and the proximal end are fixed when the jib is retracted. A mechanism for fixing both the tip and base ends of the jib, which is provided on the side of the base and tip of the fixed boom in a telescopic boom, and a rod that is suspended between the jib and the movable boom to support the jib during jib extension work. The jib tip fixing mechanism is configured such that both front and rear surfaces in the longitudinal direction of the boom and a side surface opposite to a side surface of the boom where the jib is stored are open to accommodate the jib tip engagement pin. A U-shaped fixed bracket is attached to the open side of the fixed bracket so that it can be raised and rotated around a horizontal axis in the length direction of the boom between an upright position that closes this side and a lowered position that opens the same side. The base end fixing mechanism includes a fixed bracket that supports the jib in a retracted position, and a pin hole through which the jib base end engagement pin can be engaged and disengaged in the longitudinal direction of the jib. A device for extending and retracting a supplementary jib in a wheel-type crane, comprising a movable bracket attached to be movable up and down in the same direction as the movable bracket of the jib tip fixing mechanism.