JPS6346463Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) 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.

(Prior Art) In conventional wheel-type cranes, the suspension rod supported compression column type jib (hereinafter simply referred to as jib) is generally stored in two ways: a bottom-carrying type in which the jib is folded onto the underside of the boom; There is a side-hugging type that folds on the side. 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 lengthen the field of view, 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 view is widened, the thickness in the left-right direction becomes large, which poses a problem in that it interferes with bending on narrow running roads.

For this reason, conventionally, when using a compression column type jib, in order to ensure both side visibility and maneuverability in narrow spaces, a lower-hugging storage method was adopted in consideration of maneuverability in narrow spaces, and a truss type jib was used. When used, a side-carrying system is adopted in consideration of side visibility, but the reality is that it is not a fundamental solution because problems with either one remain.

Furthermore, regarding the work of extending and retracting the jib, in the horizontal holding method, the jib is rotated approximately 180 degrees from the side to the front on a horizontal plane, so a large space must be secured on the side. In addition, with the lower holding method, it was extremely troublesome to pass the main hook between the jib feet when rotating the jib approximately 180 degrees from the bottom to the top and extending it.

Therefore, as a completely new method, the jib is stored in a horizontal position on either the left or right side of the boom in a vertical position with its thickness direction facing left and right, and after hanging vertically from this stored position, it is twisted. One possible method is to rotate it and extend it. According to this method (hereinafter referred to as "jib twist type extension" or "storage method"), it is possible to reduce the vertical and horizontal thickness to a minimum in the retracted state, ensuring both side visibility and maneuverability in narrow spaces when driving. Moreover, the jib can be easily extended and retracted even in narrow spaces.

(Purpose of the invention) The present invention provides a supplementary jib extension and storage device that can easily implement the above-described jib twist type extension and storage method with a simple configuration.

(Structure of the invention) The invention is equipped with a telescoping boom consisting of a fixed boom and a movable boom, and a suspension rod support compression column type addition jib that is added to the tip of the telescoping boom. A jib foot is provided on both sides, and boom point pins are provided horizontally in the left and right directions on both sides of the tip of the telescopic boom. In the wheeled crane to be released, the left and right jib feet are formed in a bifurcated shape that can be engaged with and disengaged from the boom point pins on both sides in the radial direction, and one jib foot is rotatable around the jib foot axis. configured,
and a means for supporting the rotatable jib foot so as to be rotatable around the axis of the boom point pin while being engaged with one of the boom point pins; means for holding the jib in a vertical stowed position facing left and right, and the jib is suspended perpendicular to the stowed position with one of the jib feet supported by one of the boom point pins so as to be rotatable about the pin's axis. The jib guide means is provided with a jib guide means for rotationally guiding the jib to the fixed beam of the telescoping boom, and the jib guide means is arranged so that the jib on the fixed beam of the telescopic boom is retracted in an inclined position with the boom horizontally facing toward the boom tip side and the end downwards. A pair of upper and lower parallel guide frames protrude outward from the side surfaces of the boom, and the jib guide has an opening at the tip and is formed in the shape of a groove track that faces the bottom of the boom when the boom is in a horizontal state. An engaging body such as a roller or a pin is provided at the base of the jib so as to be slidably engaged with the jib guide from its tip opening when the jib is in a retracted state, such as a roller or a pin. At a position facing the tip opening of the jib guide on the side surface of the boom where the jib guide is installed, one end is close to the tip opening of the jib guide, and the other end is inclined inwardly and protrudes below the boom when the boom is in a horizontal state. It is constructed by a guide frame provided with.

With this configuration, the jib can be stored vertically on the side of the boom, and the jib can be hung vertically using one boom point pin as a fulcrum, then twisted around the axis of one jib foot to extend it, and vice versa. The jib twist type overhang and storage method can be implemented using the following steps.

In addition, the jib guide means automatically guides the jib during the jib hanging process in which the jib is hung vertically from the storage position, and the jib pulling process in reverse, so the jib twist type extension and storage method can be carried out more efficiently. It will be done.

(Example) An embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show the jib in an extended state, and FIGS. 3 and 4 show the jib in a retracted state. 1 is a telescopic boom, and 2 is a jib. In addition, here,
In order to make the explanation easier to understand, a case is shown in which the telescopic boom 1 is configured as a one-stage telescopic type consisting of a base boom 1A which is a fixed boom and a tip boom 1B which is a movable boom. Of course, it is also applicable to a stage telescopic boom or a three stage telescopic boom. Furthermore, the left and right direction hereinafter refers to the direction seen from the driver's seat. As is well known, the jib 2 has a large number of connecting rods 5 fixed between a pair of side rods 3 and 4 made of flat rectangular pipes, etc., and is formed into a flat frame shape with a tapered end. .

A boom point sheave block 6 provided at the tip of the boom 1, that is, the tip of the tip boom 1B, is provided with a plurality of main sheaves 7 and idler sheaves 8, and the rotation axis of the main sheave 7 is located on both the left and right sides of the block. Both side boom point pins 9 and 10 are formed by protruding. 11 is an auxiliary sheave provided protruding from the boom point sheave block 6. On the other hand, the jib 2 is provided with bifurcated jib hoods 12 and 13 on both left and right sides of its base end. When this jib 2 is not in use, it is stored on the left side of the boom in a vertical position with the left side rod 8 facing down and the right side rod 4 facing up, with the thickness direction facing left and right.With this jib stored, the boom 1 is When fully retracted, the left jib foot 12 engages with the left boom point pin 9.
Of the left and right jib hoods 12, 13, the left jib hood 12 has a threaded shaft 12 as shown in FIG.
a, and this threaded shaft 12a is connected to the left side rod 3.
By screwing into the screw tube 12b fixed to the base end of the jib foot 12, the jib foot axis x
It is attached so that it can be rotated by a screw. On the other hand, the right side jib foot 13 is fixed to the base end of the right side rod 4. Note that both jib feet 12 and 13
are provided with fixing pin holes 14, 14 for the boom point pins 9, 10.

By the way, boom 1 has a predetermined position (the boom tip part one step below the tip boom in the case of a multi-stage boom).
As shown in FIG. 5, a boom extension sheave 15 is installed in a vertical position inclined at a predetermined angle, and the jib 2 is connected to the sheave 15 so that the sheave 15 and the jib 2 do not interfere with each other when the jib is retracted. Almost equivalent angle α
It is stored at an angle (for example, 15 degrees). Note that illustration of the boom extension sheave 15 is omitted except in FIG. 5. In addition, the inclination of the jib 2 is ignored throughout the drawings unless it is particularly necessary to show it. Therefore, with the jib 2 stored at a predetermined angle of inclination α, the relative positions of the left jib foot 12 and the left rod 8 in the circumferential direction are determined, in other words, it is possible to determine whether both 12 and 3 are relatively unrotatable. A preset mechanism 16 for holding the jib foot 12 is provided between the jib foot 12 and the base end of the left rod 3. That is, as shown in FIGS. 6 and 7, a plate-shaped bracket 17 is attached to the lower surface of the left jib foot 12 in the jib retracted state, a cylindrical bracket 18 is attached to the base end of the left rod 3, and a cylindrical bracket 18 is attached to the lower surface of the left jib foot 12 in the jib axial direction in the jib retracted state. It is fixed so that it faces opposite to. The cylindrical bracket 18 includes a pin 19 whose tip end can freely move in and out along the jib axis direction, and a spring 20 that always presses the pin 19 toward the plate-shaped bracket 17.
A spring receiver 21 is provided. Further, the base end portion of the pin 19 penetrates the spring receiver 21 and projects to the outside, and the base end portion is provided with a lever 2 having a knob 22a.
2 is attached, and this lever 22 is brought into contact with the outer end surface of the spring receiver 21. The outer end surface of this spring receiver 21 has a low surface portion 21a and a high surface portion 21b, and these both surfaces 21a and 21b are formed into a cam surface connected by an inclined surface 21c, and the lever 22 is connected to the low surface portion 21b.
1a, the tip of the pin 19 protrudes toward the plate-shaped bracket 17 and engages with the pin hole 17a provided in the bracket 17, and the lever 22 is moved as shown by the imaginary line in FIG. The tip of the pin 19 is configured to sink into the cylindrical bracket 18 when it is rotated in the circumferential direction along the inclined surface 21c and brought into contact with the high surface portion 21b.

Next, the jib guide means will be explained. 8th, 9th
As shown in the figure, on the jib 2 side, a rotatable roller 24 is provided near the base end of the right rod 4 via a bracket 23 so as to protrude upward when the jib is in the retracted state. On the other hand, on the boom 1 side, a groove-rail-shaped jib guide 25 to which the roller 24 can be engaged and disengaged is provided on the left side surface near the tip of the base end boom 1a (the side surface where the jib is stored). This jib guide 25
By fixing a pair of upper and lower guide frames 26 and 27, which are bent in a U-shape, in parallel to the left side surface of the base end boom, a horizontal groove 2 parallel to the boom axis direction is formed.
8 and the tip opening 30 of the slanted groove portion 29 which becomes downward toward the boom tip side opens diagonally downward at the lower end of the left side of the proximal boom when the boom 1 is viewed horizontally. The roller 24 engages with and disengages from the jib guide 25 via.

When storing the jib 2, the roller 24
in order to guide the base end boom 1A to the jib guide 25.
A guide frame 31 is fixedly installed at a position facing the jib guide opening 30 on the left side surface of the jib guide. This guide frame 31 consists of a main part 32 formed in the shape of a shallow vessel, and a leg part 33 extending in an inclined manner from the main part 32, and the leg part 33 is located at the lower end of the proximal boom 1A ( The main portion 32 protrudes further downward and inward from the lower end of the boom (in the horizontal state), and is screwed to the proximal end boom 1A in a state where the main portion 32 is close to the jib guide tip opening 30. 34 is a mud plate for mounting the guide frame, and 35 is a mounting screw thereof.

36 is a jib point sheave provided at the tip of the jib, and 37 is an engagement pin for storing and holding the jib, which is provided on the outer surface of the sheave block of the sheave 36 and protrudes in a shape toward the tip of the jib. 37
The jib 2 is held in the retracted position on the distal end side by entering and engaging the box-shaped bracket 38 provided on the left side surface near the proximal end of the proximal boom 1A along the boom axis direction. The jib 2 is also held in the retracted position on the proximal end side by a holding mechanism (usually a pin type) that is not shown. On the other hand, in FIGS. 3, 4 and 10, 39 prevents interference between the jib tip end portion including the jib point sheave 36 and the proximal end portion of the proximal boom 1A including the boom elevation cylinder (not shown). With a guide pipe for
It is attached to the left side of the base end of the base end boom 1A in a C-shape.

Next, the operation of this device will be explained together with the procedure for extending and retracting the jib 2.

In the jib retracted state, the rollers 24 of the jib 2 are inserted into the horizontal grooves 2 in the jib guide 25 as shown in FIG.
8 is engaged. In addition, in the preset mechanism 16, the pin 19 is inserted into the pin hole 1 as shown in FIG.
7a, and the relative rotation between the left side jib foot 12 and the left side rod 3 is stopped. The jib 2 is then extended as follows.

(a) Tilt the boom 1 horizontally as shown in Figure 11. In this state, the fixing pin 40 is inserted into the pin hole 14 of the left jib foot 12 to irremovably connect the jib foot 12 and the left boom point pin 9. Further, the pin 19 of the preset mechanism 16 is set to the seventh position by operating the lever 22 described above.
It is removed from the pin hole 17a as shown by the imaginary line in the figure, so that the left side rod 3 can freely rotate around the jib axis x.

(b) As shown in Figures 12 and 13, raise the boom 1 to about 80 degrees and extend it until the roller 24 comes off the jib guide 25 (about 60 cm). In this way, the jib 2 rises together with the tip boom 1B, and the rollers 2 of the jib 2
4 enters the inclined groove 29 from the horizontal groove 28 in the jib guide 25 and moves in the groove 29.
As a result, the jib 2 rises and rotates forward about the left boom point pin 9, detaches from the base end boom 1A, and assumes a vertical position.

(C) Next, after tilting the boom 1 and lowering the tip of the jib to a height that can be reached from the ground, move the jib 2 approximately around the jib foot axis x, as shown in Figure 14.
Twist 255° and tighten the right jib foot 13.
is engaged with the right boom point pin 10.

(d) After fixing the end of the auxiliary winding wire 41 passed through the auxiliary sheave 11 provided on the boom point sheave block 6 to the tip of the jib 2, while winding the auxiliary winding wire 41 or
While extending B, lower boom 1 further.

(e) In this way, with the boom 1 laid flat or slightly lower, the right jib foot 13 is irremovably connected to the right boom point pin 10 by the fixing pin 40, like the left jib foot 12. Also, connect the suspension rod 42 to the jib tip and boom point sheave block 6.
The jib 2 is supported by being suspended between. Furthermore, the auxiliary winding wire 41 is connected to the jib point sheave 36
, and attach the jib hook 43 to the terminal (as shown in Fig. 15).

The extension of the jib 2 is completed in the above manner.

On the other hand, the jib 2 is stored in the reverse order to the above-mentioned extension procedure. To explain only the main points, the boom 1 is laid down horizontally, the suspension rod 42 is removed with the jib 2 supported by the auxiliary winding wire 41, and the connection between the right jib foot 13 and the boom point pin 10 is released. Also, pin 1 of the preset mechanism 16
9 is made to protrude from the cylindrical bracket 18. After that, hang jib 2 vertically, and then
Twist it approximately 255° around the jib foot axis x. In this way, when the jib 2 is rotated approximately 255 degrees, the preset mechanism 16 is opened as shown by the solid line in FIG.
The pin 19 engages with the pin hole 17a, thereby preventing further rotation of the jib 2. That is, the relative circumferential position of the jib left side rod 3 and the left jib foot 12 is returned to the positional relationship in the jib retracted state, and the jib 2 is automatically set to a posture corresponding to the retracted posture. Therefore, after this, boom 1
If the jib 2 is raised to nearly 80 degrees and fully retracted, and the jib 2 is pulled toward the side surface of the proximal boom 1A by the guiding action of the rollers 24 and the jib guide 25, the jib 2 will automatically move to the predetermined position shown in FIG. It will be set in a vertical position tilted at an angle α.

In addition, when raising the boom 1 to nearly 80 degrees and engaging the rollers 24 of the jib 2 with the jib guide 25 as described above, as shown in FIG.
The roller 24 approaching the base end boom 1A first hits the leg portion 33 of the guide frame 31, then moves to the main portion 32 and touches the tip opening 3 of the jib guide 25.
It leads to 0. The guiding action of the guide frame 31 allows the roller 24 to be automatically and reliably engaged with the jib guide 25. For this reason, engagement trouble between the rollers 24 and the jib guide 25 occurs, that is, when the boom 1 is raised, the rollers 24
does not come to the tip opening 30 of the jib guide 25 but faces the bottom surface of the proximal boom 1A, and when the boom is retracted, the rollers 24 or even the rollers 24 and the jib 2 themselves interfere with the boom 1, causing the jib pulling action to fail. It will not work properly. This problem can be reliably prevented.

Note that the preset mechanism 16 is the same as the jib 2 described above.
In addition to presetting the retracted posture of the
It also functions to prevent the circumferential positional relationship with the boom point pin 9 from being disturbed due to unexpected rotation due to vibration or the like.

Incidentally, in the above embodiment, the left jib foot 12 of the jib 2 is configured to be rotated about the jib foot axis x by screw rotation, but a bearing structure may be adopted instead of the screw rotation structure. Further, in the jib guide means, a pin or a protrusion may be used instead of the roller 24 as the engaging body on the jib side. Furthermore, the specific shape of the guide frame 31 can be modified in various ways other than the above embodiments.

(Effect of the invention) As mentioned above, when using the jib extension and storage device of the present invention, the jib twist type extension and storage method,
That is, the jib can be stored vertically on the lateral side of the boom, and when extended, the jib is allowed to hang vertically from this stored state, then twisted and rotated, and the jib can be stored in the reverse order. By implementing this method, it is possible to minimize the horizontal thickness of the boom and jib in the retracted state, even though the jib is side-hugging. While ensuring this, the ability to enter narrow spaces is also improved. Moreover, the jib can be easily extended and stored even in narrow spaces.In particular, the jib can be extended and stored efficiently by the jib guiding action of the engaging body provided on the jib side and the jib guide provided on the boom side. can do well. Further, when storing the jib, the engaging body can be reliably introduced into the jib guide by the guiding action of the guide frame, so that the jib storing operation can be carried out smoothly. In particular, according to the present invention which adopts the boom fixed guide frame method, for example, a long guide pipe is extended from the jib side and provided so as to be retractable.
Compared to the case where the overhanging guide pipe is brought into contact with the boom when storing the jib to guide the engaging body to the jib guide, no extra effort is required.
It is structurally simple and highly practical.

[Brief explanation of drawings]

Figure 1 shows a jib extension according to an embodiment of the present invention.
Side view with jib extended showing storage device, 2nd
3 is a side view of the jib in the retracted state, FIG. 4 is a plan view of the same, FIG. 5 is an enlarged sectional view taken along the line of FIG. 4, and FIG. 6 is an enlarged perspective view of the jib foot portion. Fig. 7 is an enlarged side view of the same section, Fig. 8 is a side view showing the jib guide means, Fig. 9 is Fig. 8-
10 is an enlarged sectional view taken along the line of FIG. 3, FIG. 11 shows the jib extension carried out by the same device, the preparation state for extension in the storage method, and FIG. 12 shows the jib in the middle of extension. A schematic side view shown respectively, FIG. 13 is a partially enlarged view of the state shown in FIG. 12,
FIG. 14 is a schematic side view showing the jib in a twisted state, FIG. 15 is a schematic side view showing the jib in a fully extended state, and FIG. 16 is a sectional view for explaining the engaging body guiding action during the jib retraction. 1...Boom, 1A...Base end (fixed boom),
1B...Tip (movable) boom, 2...Jib, 9,
10... Boom point pin, 12, 13... Jib foot, 24... Roller (engaging body), 25...
Jib guide, 29... Slanted groove portion, 30... Tip opening, 37... Engaging pin constituting storage and holding means, 38... Same bracket, 31... Guide frame, x... Jib foot axis, 14... a pin hole constituting means for rotatably supporting the jib foot;
40...same pin.

Claims (1)

[Scope of utility model registration request] It is equipped with a telescoping boom consisting of a fixed boom and a movable boom, and a suspension rod support compression column type supplementary jib that is added to the tip of the telescoping boom, with jib feet on both left and right sides of the base end of the jib, and a jib foot on both left and right sides of the base end of the jib, and a Boom point pins are provided horizontally in the horizontal direction on both the left and right sides of the part, and the jib is extended from the tip of the telescopic boom with the jib foots on both sides supported by the boom point pins on both sides. The jib feet on both sides are formed in a bifurcated shape that can be engaged with and disengaged from the boom point pin on both sides in the radial direction, and one jib foot is configured to be rotatable around the axis of the jib foot, and this rotation is possible. means for supporting a jib foot so as to be rotatable around the axis of one boom point pin while being engaged with one of the boom point pins; a means for holding the jib in the stowed position, and a means for holding the jib in the stowed position and a vertically hanging position with the jib foot supported by one of the boom point pins so as to be rotatable about the axis of the pin; The jib guide means is provided with a jib guide means for rotationally guiding the boom, and the jib guide means faces outward toward the lateral side of the fixed beam of the telescopic boom where the jib is stored, in an inclined position with the boom being horizontal and facing toward the boom tip side. A pair of upper and lower parallel guide frames protrude from the top and bottom of the jib guide, which has an open end and is formed in the shape of a grooved rail that faces the bottom of the boom when the boom is in a horizontal state. A boom equipped with an engaging body such as a roller or a pin, which is provided at the base of the jib so as to be slidably engaged from the tip opening so as to protrude from the lateral side of the boom when the jib is stored, and the jib guide. A guide frame provided at a position facing the opening at the tip of the jib guide on the side surface, with one end close to the opening at the tip of the jib guide and the other end slanting inward and protruding below the boom when the boom is in a horizontal state. A device for extending and retracting a supplementary jib in a wheeled crane, characterized by comprising: