JPH0221334Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is applied to the tip of a telescoping girder that has an outer box fixed to the carrier side and an inner box that is telescopically inserted into the outer box. This invention relates to an outrigger device having a jack cylinder with a ground plate and an overhanging arm.

(Prior art) In work vehicles such as truck cranes equipped with this type of outrigger device, stability performance is improved by maximizing the outrigger extension width within the vehicle width limited by related laws and regulations. In order to achieve this, the outer box of the telescoping girder should be extended to the full width of the limited vehicle, and the end surface of the inner box should be flush with the end surface of the outer box when the telescoping girder is retracted (fully retracted). All you have to do is set the length dimension of the inner box to maximize the amount of expansion and contraction of the telescoping girder, and then install the jack cylinder at the tip of the inner box and as close to the tip as possible. However, in conventional outrigger devices, the jack cylinder is fixedly attached to the tip of the inner box in a direction perpendicular to the axial direction of the inner box. The box must be recessed slightly inward from the tip of the box to prevent the ground plate from protruding outside the limited vehicle width when the outriggers are retracted, and the outrigger extension width is too large considering the length of the telescopic girder. The problem was that it could not be made larger.

A method to solve this problem is, for example, to mount the jack cylinder to the tip of the inner box of the telescoping girder so that it can swing freely, and when the outrigger is retracted, the end of the jack cylinder on the side where the ground plate is attached can be tilted inward. A conceivable method is to pull the ground plate within the full width limit, and when the outriggers are extended, the jack cylinder is placed almost perpendicular to the inner box so that the ground plate is pushed out beyond the full width limit. However, as an invention made from this point of view, the one shown in Japanese Patent Application Laid-Open No. 58-49542 is known.

As shown in FIG. 1, this known outrigger device has a jack cylinder 60 swingably attached to the tip of an inner box 53 of a telescoping girder 51 by means of a fulcrum pin 57. An engagement roller 55 has a tongue-shaped engagement protrusion 56 formed at a position outward from the fulcrum pin 57, and the engagement protrusion 56 projects from the tip 52a of the outer box 52 as the telescoping girder 51 expands and contracts. When the telescopic girder 51 is fully retracted, the engaging roller 55 and the engaging protrusion 56 engage with each other as shown by the solid line in FIG. The telescopic digit 5
The lower end portion 60a of the lower end portion 60a is inclined inward so that the lower end portion 60a thereof is positioned inside the outer end surface of the first portion. Further, on the side surface of the middle part of the jack cylinder 60, there is an upper surface 61 of a guide rail 61 attached to the inner surface of the inner box 53 in an appropriately inclined state.
A guide roller 59 is attached that engages and rolls with a, and when the telescoping girder 51 is appropriately extended from the fully retracted position and the engagement protrusion 56 and the engagement roller 55 are completely disengaged. jack cylinder 6
By extending the cylinder 60', the cylinder 60' is guided by the guide rail 61 and positioned from the storage position to the operating position, as shown by the chain line in FIG.

However, in this known outrigger device, since the posture control of the jack cylinder 60 from the operating position to the retracted position is performed in conjunction with the extension and contraction movement of the telescoping girder 51, for example, if the telescoping girder 51 is moved due to an erroneous operation. If the jack cylinder 60 is extended in the fully retracted state, the fulcrum pin 57 or guide roller 59 portion of the jack cylinder 60 may be damaged, and the jack cylinder 60 may not be completely retracted. When the telescopic girder 51 is fully retracted in the state where it is not open, the guide bar 58 or inner box 53 attached to the
There is a risk that the side guide rail 61 may be damaged.

(Purpose of the invention) The present invention provides an outrigger device in which a jack cylinder is swingably attached to the tip of a telescoping girder, and the jack cylinder is tilted appropriately according to the usage state of the outrigger device. This was done for the purpose of simplifying the structure and improving operability by allowing the jack cylinder to swing in conjunction with the expansion and contraction movements of the jack cylinder.

(Structure of the invention) The present invention is a telescoping girder having an outer box fixed to the carrier side and an inner box telescopically inserted into the outer box. In an outrigger device having a pair of overhanging arms to which a cylinder is attached, the jack cylinder has the ground plate attached to the tail end on the cylinder tube side, and the rod end is connected to the inner box by a fulcrum pin. Further, between the jack cylinder and the inner box, there is a guide roller provided on the jack cylinder side, and a guide roller provided on the inner box side that extends upwardly. It is inclined in a direction away from the jack cylinder, and its upper surface is used as a guide surface for the guide roller, and it engages with the guide roller near the fully contracted position of the jack cylinder, and as the jack cylinder is retracted, the jack cylinder a groove portion for tilting so that the tail end side thereof is in a stored posture tilted toward the carrier side, and a groove portion that is recessed in a continuous manner to the side of the upper end portion of the groove portion and whose lower surface serves as a guide surface for the guide roller. At the same time, when the direction of the guide surface is such that the intersection angle between the perpendicular to the guide surface and the axis of the tilted cylinder is set to 90 degrees or more, and the guide surface and the guide roller are engaged, a first control section having a guide groove formed of a recess for holding the jack cylinder in a stored position; a guide bar provided on the jack cylinder side; and a guide bar provided on the inner box side, in which the jack cylinder is In a state where the jack cylinder is further extended than the position where the engagement state with the first control part is released and the jack cylinder is in a substantially upright state, the jack cylinder engages with the guide bar in the tilting direction, and the jack cylinder is moved in its direction. The present invention is characterized in that an attitude control mechanism is provided, which includes a second control section having a guide piece that maintains the attitude in the operating attitude.

(Embodiment) FIG. 2 shows an H-type outrigger device Z for a truck crane according to an embodiment of the present invention. This outrigger device Z has an outer box 2 fixed to the carrier (vehicle) side and an inner box 3 inserted telescopically into the outer box 2, and can be expanded and contracted as appropriate by a slide cylinder 4. The inner box 3 of the telescopic girder 1
A pair of overhanging arms X, X each having a jack cylinder 5 with a ground plate attached to the tip 3a of the vehicle, are attached to chassis frames 18, 18 of the vehicle in opposite directions. .

The length of the inner box 3 of the telescoping girder 1 is set so that the tip end surface 3b of the inner box 3 and the outer end surface 2a of the outer box 2 substantially match in the stored state (FIG. 2, illustrated state). By attaching the jack cylinder 5 to the distal end 3a of the inner box 3 and as close to the distal end surface 3b as possible, the effective amount of expansion and contraction (outrigger extension width) is increased.

As shown in FIGS. 2 and 3, the jack cylinder 5 has its rod end 5b attached to the tip 3a of the inner box 3 via a fulcrum pin 7.
It is said that it can freely swing and tilt in the direction of the arrow M-N around the center. A ground plate 6 is attached to the tail end 5a of the jack cylinder 5, that is, one end 19a of the cylinder tube 19, so as to be swingable in three axes.
The ground plate 6 is moved up and down integrally with the cylinder tube 19 in accordance with the expansion and contraction of the jack cylinder 5.

Between the jack cylinder 5 and the inner box 3, the jack cylinder 5 is moved in the direction of arrow M-N in conjunction with the expansion and contraction of the jack cylinder 5 (in other words, in conjunction with the vertical movement of the cylinder tube 19). It is tilted appropriately to the operating position (as shown by the chain line in FIG. 2, it is approximately perpendicular to the direction of expansion and contraction of the telescoping girder 1, and the ground plate 6'' is made to protrude outward from the tip surface 3b of the inner box 3. posture) and storage posture (a posture in which the ground plate 6 is inclined inward from the operating posture by an angle θ and the ground plate 6 is retracted inward from the tip surface 3b of the inner box 3 as shown by the solid line in FIG. 2). An attitude control mechanism 20 is attached which acts as a control.

The attitude control mechanism 20 includes a first control unit 20A that positions and holds the jack cylinder 5 from the operating attitude to the retracted attitude near the fully retracted position of the jack cylinder 5, and a first control unit 20A that positions and holds the jack cylinder 5 from the operating attitude to the retracted attitude. It has a second control section 20B that positions it and enables expansion and contraction operations in the operating position.

The first control section 20A includes a pair of guide rollers 12, 12 fixed to a pair of roller brackets 13, 13 protruding from the back surface of the upper end 19b of the cylinder tube 19, and a pair of guide rollers 12, 12 fixed to the inner box 3 side. The guide plate 9 has a guide groove 11 in which the roller 12 can be slidably engaged. Guide groove 11
has one end opened at the lower end of the guide plate 9, and has a straight groove 21 that slopes upward from the lower end toward the rear side of the telescoping girder 1, and a straight groove 21 that is continuous with the upper end of the straight groove 21 and that It has a recessed part 22 bent toward the front side of the telescoping girder 1 at an angle α with respect to the straight groove part 21. Note that this straight groove part 21 corresponds to the groove part in the scope of the utility model registration claim, and in this embodiment, it is constituted by a straight groove, but the present invention is not limited to this. For example, this can be constructed with a curved groove. This first control section 20A operates as follows.
That is, if we now consider a case in which the jack cylinder 5 is gradually contracted from the extended state in the operating position, the jack cylinder 5 will be moved by the guide roller 12'' as the jack cylinder 5 is contracted.
(shown with chain lines) moves upward and comes into contact with the mouth end 23a of the first guide surface 23 located above the straight groove portion 21, and then further moves upward along the first guide surface 23, so that the first guide surface 23 , and is gradually tilted in the direction of arrow M from the vertical position. Guide roller 1
2' (shown by chain lines) is the first guide surface 23 and the recess 22.
When the cylinder 5 reaches the corner 23b with the guide surface 25, the cylinder 5 is once tilted to a larger angle of inclination than the retracted position (shown by chain lines, reference numeral 5'). When the jack cylinder 5 further contracts and the guide roller 12 passes over the corner 23b and enters the recess 22, and the jack cylinder 5 reaches the stroke end, the jack cylinder 5 is set to the retracted position, which will be described later. As such, the guiding surface 25 of the concave portion 22 maintains the posture at the time of storage.

On the other hand, when the jack cylinder 5 is extended from the fully contracted state, the guide roller 12 moves from the concave portion 22 to the straight groove portion 21 and is retracted as it moves downward along the second guide surface 24 of the straight groove portion 21. The jack cylinder 5, which had been positioned in the working position, is gradually tilted in the direction of arrow N, and when the guide roller 12'' (shown by the chain line) reaches the lower end 24a of the second guide surface 24, it is positioned in the working position. In addition,
When this guide roller 12'' reaches the lower end 24a of the second guide surface 24, the second
The control unit 20B maintains the posture of the jack cylinder 5 in the operating posture.

The shape of this guide groove 11 is similar to that of the jack cylinder 5.
In order to be able to support the return moment of the jack cylinder 5 in the state in which the jack cylinder 5 is positioned in the retracted position, without increasing the extension force acting on the jack cylinder 5, as shown in FIG. The included angle β between the perpendicular l ₁ of the guide surface 25 of the recess 22 and the axis l ₀ of the jack cylinder 5 in the retracted attitude
is set so that β≧90. When the shape of the guide groove 11 is set in this way, the contact pressure F acting between the guide surface 25 of the recess 22 and the guide roller 12 in order to support the return moment due to the dead weight of the jack cylinder 5 is adjusted to the axis of the jack cylinder 5. l ₀
A component force F ₁ in the direction acts in a direction that causes the jack cylinder 5 to contract. Therefore, the contraction force F ₁ is applied to the jacket cylinder 5 in the retracted position as an external force that causes the jacket cylinder 5 to expand and contract.
and the axial component of the weight W of the cylinder 5 in the axial direction.
W ₁ acts. That is, in order to maintain the amount of expansion and contraction of the jack cylinder 5 in this retracted posture and in the fully retracted state, and to prevent the jack cylinder 5 from swinging out (i.e., elongating) due to running vibrations, etc., P ₁ =( It is sufficient to have a holding force of W ₁ − F ₁ ), and the hydraulic pressure (holding pressure) of the cylinder 5
can be lowered. Incidentally, if the included angle β between the axis l ₀ of this jack cylinder 5 and the perpendicular line l ₁ of the guide surface 25 of the recess 22 is β < 90°, then the component force F ₁ of the contact pressure F is applied to the jack cylinder 5. 5, the holding force of the jack cylinder 5 becomes P ₂ =(F ₁ +W ₁ ), and the holding force increases by 2F ₁ compared to the illustrated embodiment.

That is, this guide groove 11
When the guide groove 11 is positioned in the storage position,
The shape is such that the contact pressure acting between the cylinder 5 and the guide roller 12 does not act in a direction that causes the cylinder 5 to extend.

The second control unit 20B includes a pair of square plate-shaped guide bars 8, 8 provided on both sides of the jack cylinder 5.
and a first guide piece 10A attached to the side plates 17, 17 of the inner box 3 at an appropriate distance in the swinging direction of the telescoping girder 1 so as to sandwich the guide bars 8, 8 from both sides so as to be relatively slidable therebetween. Second guide piece 10B
It has a pair of guide pieces 10, 10 consisting of. The guide bar 8 and guide piece 10 of the second control section 20B are arranged so that the guide roller 12 is moved to the lower end 24a of the straight groove part 21 of the guide groove 11 when the jack cylinder 5 is extended from the fully contracted state as described above.
At the point in time, the cylinders 5 and 5 engage with each other to maintain the position of the cylinder 5 during operation and to permit its extension.

Further, the guide plate side pin receiving hole 46 formed in the guide plate 9 attached to the inner box 3 and the bracket side pin receiving hole 45 formed in the roller bracket 13 attached to the cylinder tube 19 of the jack cylinder 5 are shown in FIG. As shown in FIG. 3, when the telescoping girder 1 is in the stored position, they overlap each other in the horizontal direction, and in these pin receiving holes 45, 46, the side plates 17, 17 and outer box 2
A running fixing pin 14, which is detachably attached by horizontally penetrating both side plates 16, 16, is inserted therein. This travel fixing pin 14 simultaneously prevents the slide cylinder 4 from expanding due to travel vibrations and the like while the vehicle is traveling, and simultaneously prevents the jack cylinder 5 from being swung out in the direction of arrow N as the slide cylinder 4 expands. It works like that.

In FIG. 2, reference numeral 15 is a stopper for horizontally holding the ground plate attached to the lower surface of the outer box 2, and the stopper 15 is attached to the upper surface of the ground plate 6 of the jack cylinder 5 in the storage position. abutting,
It functions to hold the ground plate 6 horizontally and to suppress as much as possible the rocking of the ground plate 6 when the vehicle is running.

As shown in FIG. 2, the slide cylinder 4 has its rod end 4b attached to the inner box 3 of one extending arm X, and its rod end 4b to a cylinder mounting portion 31 formed on the outer surface of the outer box 2 of the other extending arm The tail ends 4a are each fixed. This slide cylinder 4 has a cylinder main body 34 by attaching a tail end piece 32 in the shape of a square cylinder with a bottom and a tip piece 33 in the shape of a square cylinder with a hole at both ends of the cylinder tube 26.
A cylinder rod 27 is inserted into the cylinder 4. Tail end cylinder pins 29, 29 are welded and fixed to both ends of the tail end piece 32, respectively. The tail end 4a of this slide cylinder 4 has tail end side cylinder pins 29, 29 attached to the tail end piece 32.
are dropped from above into the U-shaped receiving grooves 36, 36 of the pair of receiving members 35, 35 formed in the cylinder mounting portion 31, and further, the presser bolts 34, 34 are attached above the tail end piece 32, and the By restricting rotation and lifting, it can be easily and reliably attached to the cylinder attachment portion 31.

On the other hand, at the tip 27a of the cylinder rod 27,
A bottomed rectangular cylindrical bracket 37 having a shape and dimensions such that the tip piece 33 can be accommodated therein is attached, and the bracket 37
is the fifth when the slide cylinder 4 is fully compressed.
As shown in the figure, the tip piece 3 on the cylinder body 34 side
3 in the axial direction. Pin receiving holes 38, 38 are formed on both sides of this bracket 37, and the rod end 4b of the slide cylinder 4 is inserted into the pin receiving holes 38, 38 from the outside of the inner box 3, respectively. 30
It is fixed to the inner box 3 side by fitting and inserting.

Next, to explain the operation of the outrigger device Z of the illustrated embodiment, when installing the outrigger by extending the jack cylinder 5 from the outrigger retracted state (this is the same whether it is installed in place or extended),
When the jack cylinder 5 is extended by a predetermined lever operation, the jack cylinder 5 first controls the first control section 20A of the attitude control mechanism 20 as it extends.
is tilted in the direction of arrow N, and is automatically positioned from the inwardly tilted storage position to the operating position in which it hangs down from the fulcrum pin 7. After being positioned in the operating position, the ground plate 6'' is extended while maintaining the operating position by being guided by the second control unit 20B instead of the first control unit 20A (as shown by the chain line).
Ground.

On the other hand, when retracting the outriggers from the installed state, when the jack cylinder 5 is continuously contracted to the fully retracted position, the first control unit 20A is automatically activated when the jack cylinder 5 is contracted by a predetermined amount. However, the jack cylinder 5 is positioned from the operating position to the retracted position. That is, this outrigger device Z can be automatically operated by simply expanding and contracting the jack cylinder 5, regardless of the expansion/contraction state of the slide cylinder 4, whether it is installed on the spot or installed with an overhang. Moreover, the jack cylinder 5 can be reliably positioned in the stored position and the operating position.

Moreover, this outrigger device Z has the first
A part of the guide groove 11 of the control section 20A is formed into a recess 22, and the guide roller 12 is received within the recess 22 in order to reduce the holding pressure of the jack cylinder 5 as much as possible. When the holding pressure of the Tsuki cylinder 5 is reduced, the following problems caused by the high holding pressure can be prevented. That is, when the holding pressure of the jack cylinder 5 is high, normally in this type of outrigger device, the contraction side oil passage of the jack cylinder 5 and the contraction side oil passage of the slide cylinder 4 for telescopic girder expansion and contraction are connected. Therefore, for example, when extending the telescoping girder 1 after contracting the jack cylinder 5, the hydraulic oil that was sealed on the retracting side of the jack cylinder 5 at the initial stage of operation of the slide cylinder 4 is removed from the slide cylinder 5. The cylinder 4 acts to contract, and as a result, the holding pressure of the jack cylinder 5 decreases, causing the jack cylinder 5 to expand, which may cause a problem. be done.

In addition, in order to prevent such problems caused by the high holding pressure of the jack cylinder 5, an in-line check may be provided in the oil passage on the contraction side of the jack cylinder 5. If such a mechanism is provided, for example, when retracting the jack cylinder 5, even if the operation is stopped midway through, the retracting operation of the jack cylinder 5 will not stop immediately due to the residual pressure of the inline check, but will continue to move slightly. Although there is a concern that new problems may occur, such problems can be prevented from occurring.

(Effect of the invention) The outrigger device of the present invention is arranged between the jack cylinder and the telescopic girder, and when the jack cylinder is near full contraction, the jack cylinder is moved from the operating position to the retracted position as the jack cylinder retracts. Since the posture control mechanism includes a first control section that tilts the slide cylinder and a second control section that holds the jack cylinder in the operating position in the extended state, when storing or installing the outrigger, the operator can move the slide cylinder. Regardless of the extension state, etc., it is only necessary to extend and retract the jack cylinder, and the conventional example in which the jack cylinder is swung and tilted in conjunction with the extension and retraction operation of the telescoping girder (see Fig. 1) This outrigger device is easier to operate than the outrigger device described above, and has the effect of further improving operability.

Furthermore, by setting the direction of the concave guide surface of the first control section in accordance with the tilting angle of the jack cylinder, the return moment of the jack cylinder in the retracted position can be adjusted by the extension force acting on the jack cylinder. The structure is designed to reduce the holding pressure of the jack cylinder in its retracted position as much as possible while supporting it without increasing it, thereby preventing problems such as inadvertent elongation of the jack cylinder due to high holding pressure. It also has the effect of being able to prevent the occurrence of.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a main part of a conventional outrigger device, Fig. 2 is a longitudinal cross-sectional view of a main part of an outrigger device according to an embodiment of the present invention, Fig. 3 is a - longitudinal cross-sectional view of Fig. 2, and Fig. 4 is a longitudinal cross-sectional view of a main part of a conventional outrigger device. 2 is a cross-sectional view of FIG. 2, FIG. 5 is a cross-sectional view of FIG. 2, and FIG. 6 is a diagram showing the relationship between the guide groove and the jack cylinder shown in FIG. 1... telescopic girder, 2... outer box, 3... inner box, 4...
...Slide cylinder, 5...Jet cylinder,
6... Ground plate, 7... Fulcrum pin, 20... Attitude control mechanism.

Claims (1)

[Claims for Utility Model Registration] A telescopic girder 1 having an outer box 2 fixed to the carrier side and an inner box 3 telescopically inserted into the outer box 2. A pair of overhanging arms X, X to which a jack cylinder 5 with a ground plate 6 is attached
The jack cylinder 5 has the ground plate 6 attached to its tail end 5a on the cylinder tube 19 side, and the rod end 5b is connected to the inner box 3 by a fulcrum pin 7. Further, between the jack cylinder 5 and the inner box 3, a guide roller 12 provided on the jack cylinder 5 side and a guide roller 12 provided on the inner box 3 side are provided. It is inclined upward in a direction away from the jack cylinder, and its upper surface is used as a guide surface 23 for the guide roller 12, and engages with the guide roller 12 near the fully contracted position of the jack cylinder 5. A groove portion 21 for tilting the jack cylinder 5 so that its tail end 5a side is inclined toward the carrier side as the cylinder 5 is retracted; The lower surface of the recess is used as a guide surface 25 for the guide roller 12, and the direction of the guide surface 25 is an intersection angle between the perpendicular _l1 of the guide surface 25 and the axis _l0 of the jack cylinder 5 in the tilted state. A first guide groove 11 having a recess 22 that holds the jack cylinder 5 in the retracted position when β is set to 90 degrees or more and the guide surface 25 and the guide roller 12 are engaged. A control unit 20A,
A position where the guide bar 8 provided on the side of the jack cylinder 5 and the jack cylinder 5 provided on the side of the inner box 3 are disengaged from the first control section 20A and are in a substantially upright state. a second guide piece 10A, 10B having guide pieces 10A, 10B that engage the guide bar 8 in the tilting direction of the jack cylinder 5 in a further extended state and hold the jack cylinder 5 in its operating position; An outrigger device characterized in that an attitude control mechanism 20 comprising a control section 20B is provided.