JP4099302B2 - X-type outrigger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an outrigger provided on a work vehicle such as a rough terrain crane, and more particularly to an X-type outrigger of a type in which a pair of outrigger beams project in a crossing manner and are grounded.
[0002]
[Prior art]
FIGS. 5 and 6 show sectional views of this type of conventional X-type outrigger. This conventional X-type outrigger is slidably inserted into the outer box 102 and the outer box 102. The inner box 103 is inserted, and the outer box and the inner box are configured so that they can be expanded and contracted by the slide cylinder 104. A pair of outrigger beams Y, Y provided with a float 105 swingably attached to a front end portion 103a of the inner box 103 by a support shaft 108 are directed in opposite directions with respect to the chassis 117, and respectively by jack cylinders 110. It is configured to be pivotable in the vertical direction. As shown in FIG. 6, the X-type outrigger is fully contracted with the outrigger beams Y and Y maintained in a horizontal position as shown in FIG. 6, and the float 105 is brought into contact with the lower plate front end surface 102C of the outer box 102. To maintain the vertical position (retracted position) and, when in use, extend the outrigger beam Y as shown in FIG. 5 to bring the float 105 into a swing-free state, and then extend the jack cylinder 110 to ground the float 105. To do.
[0003]
[Problems to be solved by the invention]
However, in this conventional X-type outrigger, the float 105 is held in the retracted posture (vertical posture) by the lower plate front end surface 102C of the outer box 102, so that the float 105 is in the grounding posture (horizontal posture). Even when the float 105 is grounded as close as possible to the lower plate front end surface 102C of the outer box 102 as shown in FIG. The float 105 cannot be maintained in a horizontal posture unless the float support shaft 108 is moved outward by the length L.
[0004]
Therefore, when the work vehicle installation site is a narrow alley or the like, where the overhang length of each outrigger beam Y, Y (interval between each float 105, 105) is limited, the float 105 is maintained in a horizontal posture. The overhanging length of the outrigger beam Y (the left outrigger beam in FIG. 5) to which the overturning moment is applied during crane work is reduced by the length L required for the above, and the vehicle stability during crane work is poor. There was a problem of becoming.
[0005]
Further, when the floats 105 and 105 are grounded with the outrigger beams Y and Y being in the most contracted state (so-called in-situ installation), the floats 105 and 105 are both outside the length L in FIG. Since the vehicle parking space is required to be at least 2L longer than the vehicle width, the outrigger cannot be used in a place where the parking space is just the width of the vehicle.
[0006]
Accordingly, in view of the above-described problems of the conventional X-type outrigger, the present invention is able to take the float installation posture (horizontal posture) even when the outrigger beam is fully contracted, that is, even when the outrigger beam is fully contracted. Even if the work vehicle installation site is small, it is possible to increase the extension length of the outrigger beam on the side where the overturning moment is applied when the crane is loaded, and it can also be used in places where there is only a parking space near the vehicle width The object of the present invention is to propose an X-type outrigger that can be used.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, an outer case base end portion of an outrigger beam in which an inner box slidably inserted in an outer box can be expanded and contracted by a slide cylinder provided between the outer box and the outer box is provided. A pair of swinging linkages on one side of the outer casing, a jack cylinder interposed between the outer casing tip of the outrigger beam and the other side of the chassis, and a float mounted on the tip of the inner casing in a swingable manner. The outrigger beam tips are pivotable in the vertical direction by the jack cylinders with the outrigger beams directed in opposite directions, and the float is ungrounded when the outrigger beam is in the upward rotation position. In the X-type outrigger that can bring the float into a grounded state in the downward rotation position in the outrigger beam extended state, the outrigger beam is fully contracted and With the float lower surface being substantially parallel to the lower plate of the outer box at the upper rotation position, the float and the inner part are fixed so that the appropriate position of the float and the stopper means provided on the outer box or the inner box come into contact with each other and the swing operation is fixed. An outer box provided with a biasing means between appropriate positions at the front end of the box, a notch for storing the fixed float at the lower end of the outer box, and provided inside the side plate at the front end of the outer box of the outrigger beam An overhang guide means comprising an inner box guide member provided on the outer side plate of the inner box base end portion is provided, and during the outrigger beam extension operation, the outer box guide member upper surface, the inner box guide member lower surface, The upper surface of the box base end and the lower surface of the upper plate of the outer box are in sliding contact with each other to prevent excessive drooping of the front end of the outrigger beam .
[0008]
With this configuration, even when the outrigger beam is fully contracted, it is possible to extend the jack cylinder and ground the float, so-called in-situ installation. Also, since the appropriate position of the float is urged to come into contact with the stopper means provided on the outer box or the inner box, the float is fixed in the retracted position (running position) in which the outrigger beam is fully contracted and rotated upward. Can do it. Further, the float can be grounded in the fully contracted state of the outrigger beam, and the outrigger beam tip can be prevented from drooping during the outrigger beam extending operation.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the present invention will be described with reference to FIG. 1 to FIG. 4. The X-type outrigger shown in FIGS. 1 and 2 mutually transmits a pair of outrigger beams Z and Z to the chassis 17. The front end side of each jack cylinder 10 is attached so as to be rotatable in the vertical direction in a state facing in the opposite direction.
[0012]
Each of the outrigger beams Z, Z can be expanded and contracted by a slide cylinder 4 provided between the outer box 2 and the inner box 3 so that the inner box 3 is slidably inserted in the outer box 2. The float 5 is swingably attached to the portion 3a. The outrigger beam Z is installed by suspending the base end side of the outer box 2 from the chassis 17 by the swing link member 9 and the tip end side of the outer box 2 by the jack cylinder 10.
[0013]
The float 5 is pivotally supported by the support shaft 8 at the tip 3a of the inner box 3 so as to be swingable. Reference numeral 11 denotes a tension coil spring interposed between the rod side support 12 of the slide cylinder 4 attached to the tip of the inner box 3 and the support plate 13 of the support shaft 8 of the float 5. The tension coil spring 11 is attached with an initial tension, and in the state shown in the drawing, a clockwise rotational force is always applied to the float 5 around the support shaft 8.
[0014]
On the lower plate 21 side of the front end portion 2a of the outer box 2, there is a notch portion 23 for accommodating the float 5 of the inner box front end portion 3a in the fully contracted state of the outrigger beam Z as shown in FIGS. Is formed. That is, as shown in FIG. 1, the notch 23 has the outrigger beam Z in the fully contracted state and in the upward rotation position, and the lower surface of the floor plate 14 of the float 5 is substantially parallel to the lower plate 21 of the outer box 2. In this posture, a part (or all) of the float 5 is accommodated so that the float 5 does not collide with the outer casing lower plate 21.
[0015]
As shown in FIG. 2, reference numeral 22 denotes a stopper attached to the front end portion of the outer casing lower plate 21, which is in contact with the upper surface of the floor plate 14 of the float that is urged to rotate by the tension coil spring 11. As a result, the float 5 is restricted from rotating and maintains the retracted posture at a predetermined interval from the notch 23.
[0016]
FIG. 3 shows a state in which the outrigger beam Z is extended by the slide cylinder 4 and then the jack cylinder 10 is extended to ground the float 5 and jack up the chassis 17. FIG. 4 is a view taken in the direction of arrow A in FIG. 3 and illustrates a cross section of the lap portion between the outer box 2 and the inner box 3 when the outrigger beam Z is extended. Reference numeral 25 denotes an outer box guide member provided on the inner side of the side plate 24 at the front end portion of the outer box, and 27 denotes an inner box guide member provided on the outer side of the side plate 26 at the inner box base end portion. 27 and the overhang guide means.
[0017]
The X-type outrigger having the above-described configuration is used as follows.
(When retracted) When the outrigger beam Z shown in FIG. 2 is fully contracted and is in the upward rotation position, that is, when the outrigger beam is retracted, the float 5 is biased by the tension coil spring 11 in the illustrated position. Thus, the upper surface of the floor plate 14 of the float 5 is held in contact with a stopper 22 attached to the lower plate 21 of the outer box 2. As a result, the float 5 does not rattle due to vibrations or the like during traveling of the vehicle, and the illustrated stored posture can be maintained.
[0018]
Needless to say, the contact portion of the stopper 22 with the float floor plate 14 may be made of a material having elasticity such as rubber. By using the elastic contact portion, it becomes possible to allow some deformation, and it is possible to reduce run-out and noise during running.
As shown in FIG. 1, the float 5 can be grounded by extending the jack cylinder 10 so that the outriggers are fully extended without extending the inner box 3 from the retracted position as shown in FIG. is there. In this case, the floor plate 14 of the float 5 rotates relative to the inner box front end 2a around the support shaft 8 after being grounded to the ground, and at that time, the tension coil spring 11 is further stretched than the retracted posture. become. Accordingly, when the outrigger is retracted to reduce the jack cylinder 10, the float 5 is rotated around the support shaft 8 by the tension coil spring 11 so as to return to the retracted posture.
[0019]
As described above, the X-type outrigger of the present application enables in-situ grounding, which is impossible with the conventional X-type outrigger, and can properly regulate the movement of the float.
(At the time of maximum extension) In the maximum extension shown in FIG. 3, excessive drooping of the front end portion of the outrigger beam Z before the jackbox is often extended is often a problem. This occurs when an appropriate wrap length in the extending direction of the inner box and the outer box is not secured with respect to the gap in the vertical direction between the inner box and the outer box. In the X-type outrigger of the present application, the guide means is formed by sliding contact between the upper surface of the outer box guide member 25 and the lower surface of the inner box guide member 27 described above. The overhang direction wrap length LA determined by the sliding contact portion on the lower surface of the plate 30 is sufficiently secured. For this reason, even when the outrigger beam Z extends, the tip of the outrigger beam Z does not droop excessively.
[0020]
【The invention's effect】
In the X-type outrigger of the present invention, the jack cylinder is extended and the float is grounded in the fully contracted state of the outrigger beam, which is impossible with the conventional X-type outrigger, so-called in-situ installation is possible. In other words, since the float installation posture can be taken even when the outrigger beam is fully contracted, it is possible to increase the overhang length of the outrigger beam on the side where the overturning moment is applied when the crane is loaded even when the work vehicle installation site is narrow, Outriggers can be extended even in places where there is only a marginal parking space. Furthermore, since the appropriate position of the float is urged to come into contact with the stopper means provided on the outer box or the inner box, the float is fixed in the retracted position (running position) in which the outrigger beam is fully contracted and rotated upward. It is possible to suppress rattling and the like during traveling.
[0021]
Further, in the X-type outrigger according to the present invention, the guide means is configured by sliding contact between the upper surface of the outer box guide member and the lower surface of the inner box guide member. The extending direction wrap length determined by the sliding contact portion is sufficiently secured, and the outrigger beam tip does not droop excessively even when the outrigger beam extends.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an in-situ installation state of an X-type outrigger according to the present invention.
FIG. 2 is an explanatory view showing a stored state of an X-type outrigger according to the present invention.
FIG. 3 is an explanatory diagram of a state where an outrigger beam of the X-type outrigger of the present application is extended to jack up.
4 is a view as seen from an arrow A in FIG. 3;
FIG. 5 is an explanatory diagram of a state in which a conventional X-type outrigger is jacked up with a minimum overhang.
FIG. 6 is a storage state diagram of a conventional X-type outrigger.
[Explanation of symbols]
2,102 Outer box 2a, 102a Outer box tip 3, 103 Inner box 3a, 103a Inner box tip 4, 104 Slide cylinder 5, 105 Float 8, 108 Support shaft 10, 110 Jack cylinder 11 Tension coil spring 12 Support 13 Support plate 14 Floor plate 17, 107 Chassis 21 Outer box lower plate 22 Stopper 23 Notch 24 Outer box side plate 25 Outer box guide member 26 Inner box side plate 27 Inner box guide member Y, Z Outrigger beam

Claims (1)

The inner box inserted slidably in the outer box can be expanded and contracted by a slide cylinder provided between the outer box and the outer box base end of the outrigger beam is swingably connected to one side of the chassis. At the same time, a pair of outrigger beams are mounted in opposite directions with a jack cylinder interposed between the outer box front end portion of the outrigger beam and the other side of the chassis, and a float mounted on the front end portion of the inner box in a swingable manner. The tip of the outrigger beam can be turned up and down by the jack cylinder in the state of being directed, and when the outrigger beam is in the upward rotation position, the float is ungrounded and rotated downward in the outrigger beam extended state. In the X-type outrigger that can place the float in a grounded position in position,
In the fully contracted state of the outrigger beam and in the upward rotation position, the float lower surface is substantially parallel to the outer casing lower plate, and the appropriate position of the float and the stopper means provided in the outer casing or the inner casing come into contact with each other to perform a swing operation. While providing a biasing means between the float and the inner box tip in place to be fixed,
A notch for storing the fixed float is provided at the lower end of the outer box ,
An outboard guide member comprising an outer box guide member provided inside the side plate at the front end portion of the outer box of the outrigger beam and an inner box guide member provided outside the side plate of the inner box base end portion is provided, and during the outrigger beam extending operation In addition, the outer box guide member upper surface and the inner box guide member lower surface, and the inner box base end surface and the outer box upper plate lower surface are in sliding contact with each other to prevent excessive drooping of the distal end of the outrigger beam. Outrigger.

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