JPS6361276B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for extending and retracting a supplementary jib in a wheel crane such as a truck crane or a rough terrain crane.

(Prior art) The refill jib that is added to the telescopic boom of a wheeled crane consists of a truss-type cantilever jib with a truss structure and a number of connecting rods between the side rods made of a pair of square pipes, etc. 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 frame shape (ladder shape) with a tapered end. Among these, the latter compression column type jib is said to be advantageous in terms of manufacturing cost and weight.
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 undercarriage type, the thickness of the boom and jib in the vertical direction becomes large, so the visibility during traveling, especially the side visibility, becomes narrow.
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 is also large, which poses a problem in that it interferes with refraction 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.

(Object 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 present invention includes a telescoping boom consisting of a fixed boom and a movable boom, and a suspension rod support compression column type replenishment jib that is added to the tip of the telescoping boom. Jib feet are 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 telescoping boom, and the jib is supported by the jib feet on both sides to the boom point pins on both sides so as to be rotatable around the pin axis. In a wheel-type crane that is extended from the tip of a telescopic boom in a state where The pin is formed in a bifurcated shape that can be engaged and disengaged in the radial direction, and one jib foot is configured to be rotatable around the jib foot axis, and the jib foot is provided on at least both jib feet and boom point pins on both sides. a means for holding both side jib feet in a state of engagement with corresponding boom point pins so as to be rotatable about the axis of the pin; means for holding the jib in a vertical storage position with the jib thickness direction facing left and right on the side surface of the boom, and one of the jib feet is engaged and supported by one of the boom point pins so as to be rotatable about the axis of the pin. jib guide means for rotationally guiding the jib between the stored position and a vertically hanging position as the boom expands and contracts in the extended state, and the jib guide means rotates the jib in the fixed boom of the telescopic boom. A pair of upper and lower guide frames are fixed in parallel on the side where the boom is stored, with the boom in a horizontal state and the end facing down toward the boom tip. A jib guide formed in the shape of a groove track facing the bottom of the boom when the jib is in the retracted state, and a side surface of the boom when the jib is retracted is attached to the base of the jib so that it can be slidably engaged from the front end opening in the jib guide when the jib is retracted. The boom consists of engaging bodies such as rollers and pins that protrude from the boom, and further includes a detection means for detecting the length and angle of the boom, and detects the values detected by the detection means and the jib extension and angle. The length and angle at which the engaging body of the jib guide means can reach a position facing the front end opening of the jib guide from the outside during storage are compared with preset values, and when these agree, a notification signal is emitted. It is provided with arithmetic means for outputting.

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 drooping process, in which the jib is vertically suspended from the storage position in accordance with the expansion and contraction of the boom, and the jib pulling process, which is the opposite. can be carried out more efficiently.

Furthermore, when extending and retracting the jib,
The position of the engaging body with respect to the jib guide can be notified to the driver through arithmetic processing based on the relationship with the length and angle of the boom and a notification signal, so that the jib guiding action described above can be performed reliably. It is.

(Example) Embodiments 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, 2 is a suspension rod support compression column type supplementary jib (hereinafter simply abbreviated as jib),
3, 3 is the suspension rod. Note that here, in order to make the explanation easier to understand, we will use the telescopic boom 1.
Although the present invention is configured 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, the present invention is applicable to a two-stage telescoping type or a three-stage telescoping type boom. Of course, it is also applicable. Furthermore, the left and right direction hereinafter refers to the direction seen from the driver's seat. As is well known, the jib 2 includes a pair of side rods 2a, 2 made of flat square pipes, etc.
A large number of connecting rods 2c are fixed between b and the entire frame is formed into a flat frame shape with a tapered end.

Boom point pins 4 and 5 are attached to both left and right sides of the tip of the boom 1, that is, the tip (boom point) of the tip boom 1B, so as to be rotatable around the pin axis x. The left and right feet 6, 7 are engaged with the boom point pins 4, 5. The left and right jib feet 6, 7 are both formed into a bifurcated shape. However, the left side jib foot 6 is formed into a fork shape in which the lengths of the two pieces forming the bifurcation are equal, and the right side jib foot 7 is formed into a stepped fork shape in which one piece is shorter in length than the other piece. . Both of these jib feet 6, 7 are formed separately from the jib body, that is, the side bars 2a, 2b, respectively, and the right jib foot 7 is fixed to the base end of the right bar 2b. On the other hand, the left side jib foot 6 has an integral male threaded portion 6a as shown in FIG. 5, and this male threaded portion 6a is screwed into a socket 6b fixed inside the base end of the left side rod 2a of the jib. There is. In this way, the left jib foot 6 is attached to the proximal end of the jib left rod 2a so as to be able to rotate around the axis of the side rod (jib foot axis). The right side jib foot 7 has a pin hole 9 at one location, and the left side jib foot 6 has two pin holes 8 at the tip and middle.
a and 8b, of which the pin hole 8b in the middle is formed into a long hole shape. Further, pin holes 4a and 5a are provided in the boom point pins 4 and 5 on both the left and right sides in the radial direction.

As shown in FIGS. 3 and 4, when the jib 2 is stored, it is folded in a vertical position with its thickness direction facing left and right along the left side of the base end boom 1A. In this jib stored state, the jib 2 is Tip and base 2
It is fixed (stored and held) to the base end boom 1A at a certain point. That is, first, to explain the jib tip side, Figs. 1 to 4, and Figs.
As shown in FIG. 7, etc., an engagement pin 11 is provided in a shape of a horn to protrude from the tip of the jib 2 along the axial direction of the jib.
A box-shaped bracket 12 with openings on both sides in the axial direction of the boom is provided on the left side surface of the base end of the base end boom 1A, and the engaging pin 11 is configured to be engaged from the front of this bracket 12. There is. The bracket 12 and the engagement pin 11 are provided with pin holes 12a, 11a that match in the vertical direction when the jib is stored, and the tip fixing pin 1 is inserted into the pin holes 12a, 11a.
3 so that the engaging pin 11 can be fixed to the bracket 12. On the other hand, the fixation of the base end of the jib is as shown in FIG.
And brackets 14 and 15 with pin holes protruding from the side surface of the left side rod 2a of the jib are connected to the base end fixing pin 1.
This is done by joining with 6.

Next, the jib guide means will be explained. On the jib 2 side, the side surface of the right rod 2b (top surface when the jib is stored)
A bracket 17 is provided protruding from the bracket 17.
A rotatable roller 18 is provided protruding toward the left side surface of the boom when the jib is in the retracted state to constitute an engaging body. On the other hand, on the boom 1 side, a groove-rail-shaped jib guide 19 to which the roller 18 can be engaged and disengaged is provided on the left side surface (the side surface where the jib is stored) near the tip of the proximal boom 1A. This jib guide 19 includes a pair of upper and lower guide frames 20 bent in a U-shape,
21 is fixed in parallel to the left side surface of the base end boom, so that the horizontal groove part 22 parallel to the boom axis direction and the inclined groove part 23 which is downward facing toward the boom tip side when the boom is horizontal are connected. It has an open groove rail shape with open sides and both ends. The lower guide frame 21 is formed into a flat plate shape, and the upper guide frame 20 is formed into a frame shape with an L-shaped cross section and integrally provided with a stopper 20a at the tip end to prevent the roller 18 from coming off laterally. There is. Further, the tip (front end) opening 23A of the inclined groove portion 23 opens diagonally downward from the lower end of the left side of the proximal boom when the boom 1 is viewed horizontally.
The roller 18 engages with and disengages from the jib guide 19 via.

24, 24 are suspension rod mounting seats,
The rods 2a, 2b on both the left and right sides at the tip of the jib 2 are provided to protrude upward, and one end of the suspension rods 3, 3 is fixed to the mounting seats 24, 24 with pins 25, 25 when the jib is used or stored. I try to put it on. In addition, in order to store the suspension rods 3, 3 in the jib 2 when the jib 2 is stored, there are L-shaped rod receivers 26, 26 on the left and right sides of the base end of the jib 2.
Attach the rod holders 2 to the left and right sides of the middle part of the jib 2.
7 and 27, respectively. The rod holders 27, 27 each have a U-shaped holder body 28 as shown in FIGS. 10 and 11.
, an opening/closing link 29 that opens and closes the upper opening of the main body 28, and a torsion coil spring 30 that always biases this link 29 in the direction of closing the main body.When storing the rod, the opening/closing link 29 closes the main body 28 and the rod is closed. 3, and when the rod is in use, the link 29 is opened so that the rod 3 can be removed from the main body 28. 28a is opening/closing link 2
This is a pin that holds 9 in an open state.

31 is a boom point sheave block, 32 is an auxiliary sheave bracket attached to the tip of the sheave block 31, 33 is an auxiliary sheave attached to the bracket 32, 34 is a jib point sheave block, and 35 is attached to the sheave block 34. Jib point sheave. Further, 36 is a jib foot, 37 is an auxiliary winding wire rope for the jib foot (hereinafter referred to as auxiliary winding rope) pulled out from a winch (not shown) of the crane main body, 38, 3
Reference numeral 8 designates jib twist handles provided on both sides of the jib point sheave block 34. Further, the jib guide 19 is provided with a limiter switch 39 at the tip of the upper guide frame 20.

Next, the jib twist type extension and storage method implemented by this device will be explained.

As shown in FIGS. 3 and 4, the jib 2 is placed along the left side of the proximal boom 1A in a vertical position with the right side rod 2b up and the left side rod 2a down in the extended state, as shown in Figures 3 and 4. In this state, the engaging pin 11 at the tip of the jib is engaged with the bracket 12 at the proximal end of the proximal boom 1A and fixed with the tip fixing pin 13, and the brackets 14 and 15 are fixed at the proximal end. By fixing with the pin 16, the jib 2 is fixed in the vertical storage position. In addition, in this jib storage state, the rollers 18 of the jib 2 are
As shown in FIG. 9, it engages with a horizontal groove 22 in the jib guide 19. The jib 2 is extended from this state by the following procedure.

(b) With the crane outrigger (not shown) extended to stabilize the aircraft, fully retract the boom 1 and point it toward the side or rear of the aircraft in an almost horizontal position.

(b) As shown in FIG. 12b, remove the jib tip fixing pin 13 and insert the pin 13 across the pin hole 4a of the left boom point pin 4 and the intermediate pin hole 8b of the left jib foot 6. This connects the left jib foot 6 and boom point pin 4, and repurposes the jib tip fixing pin 13 as a jib foot pin.

(c) Remove the jib base end fixing pin 16. This pin 1
6 will later be used as a foot pin for the right side jib foot 7.

(d) As shown in Fig. 13, raise the boom 1 to a predetermined angle (e.g. 80°) and raise the boom 1 to a predetermined length where the roller 18 comes off from the jib guide 19 (e.g. when the boom fully retracted length is 10 m). Then, the length is 60cm (10.6m) (60cm long).
extent). As a result, the jib 2 rises together with the tip boom 1B, and the rollers 18 of the jib 2 enter the inclined groove 23 from the horizontal groove 22 in the jib guide 19 of the proximal boom 1A and move in the inclined groove 23. Due to the guiding action of the jib guide 19 and rollers 18, the jib 2
first moves linearly upward to disengage the engagement pin 11 from the bracket 12, and then, while the jib 2 rises, it rotates forward around the axis x of the boom point pin 4 and disengages from the proximal boom 1A. Becomes a vertical posture. In this way, the jib 2 is rotationally guided from the storage position to a vertically hanging position by the jib guide means.

(e) Next, lower the boom 1 to a height where the handles 38, 38 of the jib point sheave block 34 can be operated from the ground.

(f) Hold the handles 38, 38 and rotate the jib 2 at approximately 255° (13th
(from the state shown in FIG.

In this way, since the jib 2 is twisted and set at the tip of the boom, the main hook (not shown) suspended below the boom point sheave block 32 can be easily moved around the base end of the jib 2. can. Alternatively, if you lower the main hook to the ground beforehand, you only need to change the suspension wire of the hook, so you can pass the main hook through the base end of the jib when extending the jib, as in the case of the conventional under-carrying type. You will no longer have to struggle with your work. Moreover, since the distance between the jib feet 6, 7 and the proximal connecting rod 2C can be smaller than that of the conventional method, it is advantageous in terms of jib strength.

(g) As shown in FIG. 15, wind up the auxiliary rope 37 and bring the jib hook 36 into contact with the end face (lower face) of the jib point sheave block 34, and in this state, wind up the auxiliary rope 37 further, or
Alternatively, while extending the tip boom 1B, the boom 1 is lowered so that the jib 2 is approximately 1 m above the ground (this method is usually used).

(H) After lowering the boom 1 horizontally or slightly below it, attach the jib base end fixing pin 16 that was previously removed to the right jib foot 7 as shown in Fig. 16.
By inserting the jib foot 7 between the pin hole 9 of the right boom point pin 5 and the pin hole 5a of the right boom point pin 5, the jib foot 7 is prevented from coming off from the boom point pin 5. In addition, in (b) above, the pin holes 8b and 4a of the left jib foot 6 and the left boom point pin 4 are
The jib tip fixing pin 13 inserted into the jib foot 6 is removed once, and the same pin 13 is replaced into the tip pin hole 8a of the jib foot 6 as shown in FIG. Note that when replacing the pin 13, the pin 13 can be easily removed since the intermediate pin hole 8b of the left jib foot 6 is made into a long hole. In this manner, in the jib extended state, the left jib foot 6 and the left boom point pin 4 are brought into close contact with each other while maintaining their engaged state.

(li) Remove the base ends and intermediate parts of the suspension rods 3, 3 from the rod receivers 26, 26 and rod holders 27, 27, and attach the base ends of the rods to the boom point sheave block 31 as shown in FIG. Thereby, the suspension rods 3, 3 are suspended between the jib 2 and the tip boom 1B to support the jib 2.

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

Furthermore, the jib 2 is stored in the reverse order to the above-mentioned extension procedure. To summarize the main points, the boom 1 is tilted horizontally or slightly lower, and the length is slightly extended beyond the fully retracted position. Next, hoist the jib hook 36 and remove the jib point sheave sheave block 34.
With the jib 2 supported by the auxiliary winding rope 37 and the jib hook 36, the suspension rods 3, 3 are removed and stored in the jib 2. Then, the jib tip end fixing pin 13 used as the engagement holding pin for the left jib foot is reinserted in the opposite direction to that in (h) when the jib foot was extended, and the jib base end fixing pin 16 is removed from the right jib foot 7. After that, boom 1
By loosening the auxiliary hoisting rope 37 while raising the jib 2 (or by extending the tip boom 1B by about 2 m in advance and then retracting the same boom 1B), the jib 2 is rotated downward and suspended in a vertical position. After loosening the auxiliary winding rope 37 and removing it from the jib point sheave sheave block 34, the jib 2 is rotated about 255 degrees around the jib foot axis y.

Next, by raising the boom 1 to a certain length (for example, if the boom fully retracted length is 10 m, the length is 10.6 m) to a predetermined angle (for example, 80°),
As shown in FIG. 19A, the roller 18 of the jib 2 is brought to a position facing the tip opening 23a of the inclined groove 23 in the jib guide 19 of the proximal boom 1A. If boom 1 is retracted in this state, the 19th
As shown in FIG. 2, the roller 18 enters the inclined groove 23 of the jib guide 19, and as the boom retracts, the roller 18 rolls in the inclined groove 23 toward the horizontal groove 22. This roller 18 and jib guide 1
The jib 2 is automatically drawn to the left side surface of the boom 1A by the jib guiding action by the inclined groove portion 23 of 9. Then, as the roller 18 continues to move backward in the horizontal groove 22, the jib 2 retreats along the base boom 1A, and the engagement pin 11 at the tip of the jib automatically fits into the bracket 12 of the base boom 1A. It's crowded. In this way, the jib 2 is finally folded into the posture shown in FIGS. 3 and 4, and in this state, the jib 2 is fixed in the stored state by setting both the fixing pins 13 and 16 at the distal end and the proximal end.

When this jib twist type extension and storage method is used, the jib 2 is stored in a vertical position with its thickness direction facing left and right along with the boom 1. The total thickness can be kept to a minimum. Also, of course, the thickness in the vertical direction can be reduced to a minimum of approximately the thickness of one boom.
Therefore, it is possible to simultaneously ensure side visibility while driving and maneuverability in narrow spaces.

Moreover, when extending and retracting the jib 2, the jib 2 is placed in a vertical position and twisted around the jib foot axis y, thereby changing the position from the vertical position (position when stowed) to the horizontal position (position when extended) or vice versa. Because of this, although it is a side-hugging storage method, there is no need to secure a wide sideward turning space for the jib as in the conventional case, and the jib 2 can be easily extended and stored even in a narrow space.

Also, the jib guide 19 of boom 1 and jib 2
jib guide means by rollers 18 and boom 1
By the telescoping motion, the jib 2 can automatically change its posture from a posture along the boom 1 to a vertical posture (when extended) or vice versa (when retracted).

The above is an explanation of the basic jib extension and retraction method using this device. The important points are the steps shown in FIGS. 13 and 19, in which it is moved in the opposite direction (during storage). That is, at this time, by setting the boom 1 at a predetermined length and angle as described above, the 19th
As shown in FIG.
When storing the roller 18, the roller 18 is brought to the position immediately after coming off from the jib guide 19 (hereinafter referred to as the "A" position), and when storing the roller 18 from the "A" position, 19th
Reach the position where the jib guide is inserted into the tip of the jib guide (hereinafter, this position will be referred to as the "B" position) as shown in Figure B. However, since the jib guide mechanism is located on the left side of the tip of the boom and is difficult to check from the driver's seat located on the right side of the boom, the reliability of the jib guide mechanism remains unreliable and there is a risk of erroneous operation. be. Therefore, in this device, the boom operation at the above stage can be managed based on the length and angle of the boom 1.

This type of crane is equipped with a length meter and an angle meter that detect the length and angle of the boom for the purpose of preventing overload, etc., and also calculates and processes these detected values to display the boom status and It is equipped with a monitoring device (work management system) called a so-called OK monitor that issues an alarm in accordance with the situation.
In this embodiment, the existing monitor device is used as a calculation means to manage the jib guide action, and the boom when the roller 18 comes to the "A" position shown in FIG. 19A during jib extension and retraction is used. The length and angle of the boom 1 and the length and angle of the boom when the roller 18 comes to the "B" position in Fig. 19 (b) when stored are set in advance as set values in the calculator of the monitor device. The monitor device notifies (displays) when the boom length and angle detected by the angle meter and the angle meter match the above-mentioned set values.

Specifically, in the block diagram shown in FIG. 20, 40 is a computing unit of the monitor device, 41 is a notification section (display section) that emits a notification signal, 42 is a confirmation lamp for when it is extended, and 43 is for when it is retracted. confirmation lamp,
44 is boom length inappropriate lamp (warning lamp), 4
5 is boom angle not possible lamp (warning lamp), 46
is a drive circuit for these lamps, and 47 is a buzzer drive circuit. Further, 48 is a control unit, 49 is an alarm/detection buzzer (or chime) connected to the buzzer drive circuit 47, and 50 is an extension/retraction switch. A signal indicating whether the work is to be extended or retracted is input to the computing unit 40, and only at this time the monitor device functions as a management system for the jib guide operation. Reference numeral 51 denotes a relay that is activated when the limiter switch 39 provided at the tip of the guide frame 20 of the jib guide 19 is turned on by contact with the roller 18 (actually, the bracket 17). The ON signal of the limiter switch 39 is output to the calculator 4.
It is input to 0. 52 is a length detector as a detection section of the boom length meter, and 53 is an angle detector as a detection section of the angle meter.

Therefore, if the boom length is 10 m as the reference value for boom length, and when the jib is extended and retracted, the boom length will be 60 cm (+0.05 m) longer than the fully retracted length, and the boom angle will be 10.6 m (+0.05 m). is 80° (±0.05
m), when the boom angle is 80° (±1°), the roller 18 reaches the “A” position, and when retracted, the boom angle is 80° (±1°) and the boom length is 10.5 m. Assuming that the roller 18 will move from the "A" position to the "B" position when this happens, these numerical values are set in advance in the calculator 40. Under this setting,
First, when performing work to extend jib 2,
As shown in Figure a, the changeover switch 50 is turned on to the extended side. As a result, the extension confirmation lamp 42 falls over, and the arithmetic unit 40 is set to the extension side program. At this time, if the boom 1 is fully retracted and the boom angle is 80° (±1°), the boom length not allowed lamp 44 and boom angle not allowed lamp 45 are off, and either condition is met. If the condition is not satisfied, the boom angle not possible lamp 44 or the boom angle not possible lamp 45 or both are lit. Therefore, the driver must use both lamps 44 and 4.
The length or angle of the boom 1 may be corrected until the light 5 goes out. If this is OK, then extend boom 1 until the boom length is 10.6 m (+
0.05 m), the detection signal matches the preset value, and the boom length impossibility lamp 44, which had been lit at the same time as the start of the boom extension, goes out and the buzzer 49 sounds. Note that this buzzer 49 has a function that can distinguish between an alarm sound and a notification sound, and when the boom length matches the set value as described above, the buzzer 49 will emit an intermittent sound, for example, several times. When a notification sound is emitted and the boom 1 is further extended without noticing the boom length not allowed lamp 44 going out and the buzzer detection sound, the boom length not allowed lamp 44 is turned on and the buzzer 49 emit, for example, a continuous warning sound. Configure it so that it is emitted.

In this way, the driver can be informed that the boom length and angle satisfy the predetermined conditions for the roller 18 to be in the "A" position. Therefore, if the boom 1 is then folded down, the jib 2 can be lowered from the ground to a position where it can be twisted in a vertically hanging position.

On the other hand, when storing, as shown in FIG. 21b,
By turning on the changeover switch 50 to the storage side, the confirmation lamp 43 for storage is lit, and the arithmetic unit 40 is set to the storage side in the program. At this time, if the boom length is set to 10.6 m (+0.05 m), the boom length not possible lamp 44 is turned off, and if not, the same lamp 44 is turned on.
Note that the boom angle does not matter at this time, so
The boom angle not possible lamp 45 remains off. If it is OK here, raise boom 1 (when you start raising boom 1, the boom angle not possible lamp 45 lights up), and when the angle reaches 80° (±1°), the boom angle not possible lamp 45 lights up. 45 is turned off, and otherwise the lamp 45 remains lit. Then, if it is OK here, roller 1
8 has come to the "A" position in Figure 19 A,
Thereafter, when the roller 18 comes to the "B" position in FIG. By ANDing the detection signal from the limiter switch 39 and the on signal from the limiter switch 39 which is turned on by the roller 18, the boom length not allowed lamp 44 is turned off.
Buzzer 49 emits a notification sound. This notifies the driver that the roller 18 has entered the jib guide 19 without fail. Therefore, after this,
If boom 1 continues to be retracted, roller 18 will move in jib guide 19 and jib 2 will move boom 1.
When the boom is fully retracted, the jib will be fully retracted. On the other hand, if the limiter switch 39 does not operate even though the boom length has reached 10.5 m, that is, if the roller 18 does not enter the jib guide 19 due to some kind of trouble, the boom length not possible lamp 4
4 lights up, the buzzer 49 emits an alarm sound. Therefore, in this case, the boom 1 will be extended again and returned to the "A" position, and the operation will be repeated.

In addition, when extended, boom 1 is 10.6 m.
(+0.05m) (e.g. 10.7m)
The boom 1 may be configured to automatically stop when the boom 1 is extended to 10.5 m or less, or when no activation signal is input from the limiter switch 39 even though the boom 1 is contracted to 10.5 m or less when retracted. . The circuit is shown in phantom lines in FIG. 20, and 54 is an automatic stop relay, and when the above automatic stop condition is reached during extension and retraction, the relay 54 is activated and its contact 54a is closed. The automatic stop signal is configured to be sent to the expansion/contraction control circuit of No. 1.

By the way, in the above embodiment, the "B" position where the roller 18 enters the jib guide 19 when the jib is stored is also subject to management, but in reality, as long as the roller 18 reaches the "A" position, there will be no serious trouble. Unless something happens, boom 1
If the roller 18 is sheave blocked, the roller 18 will surely come to the "B" position, so it is not necessarily necessary to manage this "B" position. Therefore, in the device of the present invention, all that is needed is to manage the "A" position, and this allows the jib 2 to be controlled at both the position along the boom 1 and the vertically hanging position away from the boom 1, both when extended and retracted. This allows for reliable movement between the two. In addition, in the above embodiment, a monitor device already installed in the wheeled crane is used as a control means for managing the jib guide action, but of course, a control means exclusively for the jib guide action is independently employed. You may. Regarding the jib guide means, the horizontal groove portion 22 of the jib guide 19 is connected to the engagement pin 11 of the jib 2.
This is necessary only when the configuration of the above embodiment is adopted in which the jib is automatically engaged and disengaged from the box-shaped bracket 12 of the base end boom 1A, and it does not matter the specific configuration of the jib storing and holding means for the base end boom 1A. In this case, the horizontal groove portion 22 is not necessarily necessary, and the entire jib guide 19 may be formed in an inclined shape. On the other hand, the engaging body is not limited to a single-wheel roller structure as mentioned in the above embodiment, but may also be a double-wheel roller structure or a simple pin.
Also, as a means for engaging and holding the both side jib feet 6, 7 with the both side boom point pins 4, 5, the pins are attached to the jib foot in a manner that confines the boom point pins within the jib foot, as shown in Figs. 1 and 10. You can take steps to insert it. In this case, the pin hole on the boom point pin side becomes unnecessary.

(Effect of the invention) As described 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 a narrow space, and in particular, the jib can be stored by the telescopic movement of the boom and the jib guide means, which consists of a jib guide in the form of an inclined groove track and an engaging body that engages with the jib guide. Since the position can be automatically changed from the vertical position to the vertical position or vice versa, the jib extension and retraction operations can be made more efficient.

Furthermore, when extending and retracting the jib,
The position of the engaging body with respect to the jib guide can be notified to the driver through arithmetic processing based on the relationship with the length and angle of the boom and a notification signal, so that the jib guide action described above can be performed reliably. It is.

[Brief explanation of drawings]

FIG. 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 perspective view of the jib foot portion of the device, and FIG. 6 is a side view of the jib in the retracted state. An enlarged view, Fig. 7 is a cross-sectional view taken along the line of Fig. 6, Fig. 8 is an enlarged view of section E in Fig.
10 is an enlarged view of the part O in FIG. 4, FIG. 11 is a sectional view taken along line XI-XI in FIG. 10, and FIG. , Fig. 12b is an enlarged view of the left jib foot in the same state, Fig. 13a and b are schematic side views of the jib before and after hanging it in a vertical position, and Fig. 14 is an enlarged view of the left jib foot in the same state. The figure is a schematic side view of the state in which the jib foot is further rotated approximately 90 degrees, Figures 16 and 17 are side views showing the jib foot set in the jib extended position, and Figure 18 is a schematic diagram showing the jib foot fully extended. Side view Figures 19A and 19B are side views showing the working status of the jib guide mechanism during extension and retraction, Figure 20 is a block diagram showing the management system for the jib guide action, and Figures 21a and b are the same flowchart. be. 1... Telescopic boom, 1A... Base end (fixed boom), 1B... Tip (movable) boom, 2... Jib,
3... Suspension rod, 4, 5... Boom point pin, 6... Bifurcated left jib foot,
7... Right side jib foot, 17... Roller bracket constituting an engaging body of the jib guide means, 18...
...Same roller, 19...Same jib guide, 20...Above guide frame, 21...Lower guide frame, 23...Slanted groove, 23a...Tip opening, x...Boom point pin axis, y...Jib foot Axial center, 40...
...Arithmetic unit, 42-45... Lamp that emits display (notification) signal, 49... Same buzzer, 52... Boom length detector, 53... Same angle detector, 8a, 8
b, 9...pin holes constituting the engagement and holding means of the jib foot; 13, 16...the same pins;

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 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,
Boom point pins are provided horizontally in the left and right directions on both left and right sides of the tip of the telescopic boom, and the jib is configured such that the jib foot on both sides is supported by the boom point pins on both sides so as to be rotatable around the pin axis. In a wheeled crane that extends from the tip of a telescoping boom and is stored on the lateral side of the boom in a vertical position with the thickness direction facing left and right,
The left and right jib feet are formed in a bifurcated shape that can be engaged with and detached from the boom point pins in the radial direction, and one of the jib feet is configured to be rotatable about the jib foot axis, and both jib feet are configured to be rotatable about the jib foot axis. It consists of a pin hole provided in at least both side jib feet and a pin inserted into this pin hole among both side boom point pins, and both side jib feet can be rotated around the axis of the corresponding boom point pin. means for holding the jib in a vertical stowed position with the jib's thickness direction facing left and right on the lateral side of the boom; jib guide means for rotationally guiding the jib between the storage position and a vertically hanging position as the boom expands and contracts in a state in which the jib is rotatably engaged and supported around the pin axis; The jib guide means is a pair of upper and lower guide frames that are fixed in parallel on the lateral side of the fixed boom of the telescopic boom where the jib is stored, in an inclined position with the boom horizontal and the end facing downward. and a jib guide formed in a groove rail shape with an open side surface and a front end opening facing below 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 front end opening when the jib is stored, and protrudes toward the side of the boom when the jib is stored. and a detection means for detecting the length and angle of the boom, a detection value by the detection means, and an engaging body of the jib guide means that detects the length and angle of the boom when the jib is extended and retracted. The wheel is characterized in that it is provided with calculation means for comparing the length and angle at which the wheel can reach a position viewed from the outside with preset values, and outputting a notification signal when these agree. Extending and storing equipment for additional jibs on type cranes.