JP2009001397A - Malfunction prevention device of outrigger device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that the operation (the change) of each outrigger is performed only by the determination of an operator in a conventional outrigger device, and each outrigger cannot completely avoid any unexpected action (simultaneous different actions by the specified outrigger and by other outrigger). <P>SOLUTION: A lever interlocking guide 7 having two lever butting members 71, 72 across change levers 56, etc. of slide/jack selection means 5A-5D longitudinally in their operating direction is installed in a displaceable state in the change lever operating direction. The space of the two lever butting members 71, 71 is set to be a value in which the change lever 56 is only operated in a range to each neutral zone from the slide operation side end position and the jack operation side end position, and the lever interlocking guide 7 prevents any outrigger operation while the slide/jack selection means 5A-5D are in the dissimilar selection state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a malfunction prevention device for an outrigger device installed in a vehicle such as an aerial work vehicle or a crane vehicle.

  FIG. 8 shows a conventional aerial work vehicle (outer plan view) with an outrigger device. In this aerial work vehicle, a total of four outriggers 2 </ b> A to 2 </ b> D are installed on the front, rear, left and right of the vehicle 1. Yes. In the aerial work vehicle 1 of FIG. 8, reference numeral 15 is a swivel, 16 is a telescopic boom, and 17 is a boarding bucket. FIG. 9 is a rear view of the work vehicle 1 of FIG. 8 and shows a usage state (an overhanging state) of each of the outriggers 2A to 2D.

  Some work vehicles are provided with a pair of left and right outriggers only on the front side of the vehicle, and the outrigger device in this case has a function of lifting the front side of the vehicle and tilting the vehicle backward.

  As shown in FIG. 9, each of the outriggers 2A to 2D of the aerial work vehicle 1 in FIG. 8 has a slide beam 3 and a jack 4 attached to the tip of the slide beam. Each slide beam 3 is configured such that the inner box 32 in the outer box 31 can be moved in and out by the slide cylinder 33 to the side of the work vehicle. Each jack 4 can move the inner box 42 in the outer box 41 up and down by a jack cylinder 43.

  Each of the outriggers 2A to 2D is operated by an operating device indicated by a symbol A in FIGS. In the illustrated example, the operating device A is installed in the storage box 18 at the center of the rear end of the vehicle 1. In addition, as what installed the operating device A of the outrigger apparatus in the center of the rear-end part of the vehicle 1, what was described in Unexamined-Japanese-Patent No. 62-183219 (patent document 1), for example.

  And the said operating device A selects each slide / jack selection means 5A-5D (FIG. 9, FIG. 10) which selects whether to operate the slide cylinder 33 or jack cylinder 43 in each outrigger (four) 2A-2D. ) And expansion / reduction switching means 6 for switching the selected cylinder (33, 43) between the expansion side and the reduction side. FIG. 12 shows a hydraulic circuit of an outrigger device part used in the work vehicle 1 of FIG.

  As shown in FIGS. 10 to 12, each of the slide / jack selection means 5 </ b> A to 5 </ b> D is configured such that a slide / jack selection valve (hereinafter simply referred to as a selection valve) 51 can be switched by a switching lever 56. Then, in each slide / jack selection means 5A to 5D, when the switching lever 56 is positioned at the neutral position N in the central portion in FIG. 11, the selection valve 51 is turned OFF, and the switching lever 56 is moved upward as indicated by reference numeral 56 '. The selector valve 51 is connected to the operating side of the slide cylinder 33 when it is positioned at the moving position (slide operation position) S, and the selector valve 56 is positioned at the downward movement position (jack operation position) J as indicated by reference numeral 56 ″. 51 is connected to the operation side of the jack cylinder 43. Each selection valve 51 holds the spool 52 in the neutral position, the slide operation side end position and the jack operation side end position on both sides thereof. Notch mechanisms (53, 54) are provided so that the switching levers 56 are held at their respective positions in normal operation.

  For one outrigger (2A to 2D), only one of a slide operation and a jack operation can be selected by the slide / jack selection means (5A to 5D), but each outrigger 2A to 2D has a slide / jack selection means 5A. The slide operation and the jack operation can be individually selected by 5D.

  On the other hand, as shown in FIGS. 10 and 12, the expansion / reduction switching means 6 operates the direction switching valve 61 with the operation lever 66, so that the hydraulic oil from the hydraulic pump 21 (FIG. 12) is supplied to the cylinder (33, 33). 43) can be switched between supply to the expansion side and reduction side.

  Then, the operating device A of the outrigger device selects the slide / jack selection means 5A-5D of the outriggers 2A-2D to be operated to a predetermined side, and then switches the expansion / reduction switching means 6 in a predetermined direction. The desired operation can be performed on the desired outrigger. When operating only a specific outrigger (for example, the two on the front side), the slide / jack selection means (selection valve) for the other outrigger (for example, the two on the rear side) is extended / reduced in a neutral state. The switching means 6 is switched in a predetermined direction.

  By the way, each selection valve 51 of each slide / jack selection means 5A to 5D selects slide operation or jack operation according to the moving direction of the spool 52, while the valve opening degree changes depending on the movement amount of the spool 52. Further, as shown in FIG. 13, the selection valve 51 of each slide / jack selecting means 5A to 5D can move the spool 52 (oil passage port) to the neutral region and the slide operation region and jack operation region on both sides thereof. It has become. The neutral zone is the range in which the spool moves back and forth by a small length L (L = approximately 2 mm) from the center of the neutral zone. The slide operation zone and jack operation zone are each from each end of the neutral zone to the stroke end. This is a range that moves by a length M (M = about 7 mm). When the oil passage port of the spool 52 is slightly deviated in any direction (slide operation area or jack operation area) from the end of the neutral area, the valve opening degree is small, but a predetermined function is generated.

Japanese Utility Model Publication No. 62-183219

  By the way, in this type of outrigger device, when only two out of the four outriggers 2A to 2D (for example, the front outriggers 2A and 2B) are slid to the projecting side, each slide / The jack selection means (for example, 5A, 5B) is selected as the slide operation side, and the slide / jack selection means (for example, 5C, 5D) of the other two outriggers (for example, the rear outriggers 2C, 2D) are made neutral. Thereafter, the expansion / reduction switching means 6 is operated to the expansion side. However, if the extension / reduction switching means 6 is operated to the extension side while the intention to neutralize the slide / jack selection means of the outriggers that are not used remains in the jack operation area, the desired outrigger is slid to the extension side. At the same time, another outrigger is jacked to the extension side, which may cause a safety problem due to unexpected movement.

  Further, when operating a specific outrigger jack 4 for level adjustment of the vehicle from the state where the vehicle is levitated by the four outriggers 2A to 2D, the slide / jack selection means of the outrigger is set to the jack operation side. After selecting the other outrigger slide / jack selection means to neutral, the slide / jack selection means 6 is switched to the desired direction, but the outrigger slide / jack selection means not used at that time is intended to be neutral. If the expansion / reduction switching means 6 is operated in either direction while the actuator remains in the slide operation area, the outriggers that do not want to operate will try to act on the slide side while the output is small while the jack is grounded. Unnatural power will work.

  Some work vehicles have outriggers only on the front (two on the left and right) of the vehicle. In this case, the two outriggers are operated separately on the slide operation side and the jack operation side. It is thought that it is done.

  However, in the conventional outrigger device, each outrigger is operated (switched) only by the operator's judgment, and the unexpected operation as described above (a specific outrigger and another outrigger perform different operations simultaneously) is performed. It could not be avoided completely.

  Accordingly, an object of the present invention is to provide a malfunction prevention device for an outrigger device that prevents different operations (sliding operation and jacking operation) from being performed simultaneously on each outrigger in a work vehicle with an outrigger device.

  The present invention has the following configuration as means for solving the above problems. Note that the present invention is directed to a malfunction prevention device for an outrigger device for preventing each outrigger from simultaneously performing different operations (sliding operation and jacking operation).

[Invention of Claim 1 of the Present Application]
According to a first aspect of the present invention, there is provided a malfunction prevention device for an outrigger device, wherein an outrigger having a slide beam using a slide cylinder and a jack using a jack cylinder is installed on the left and right sides of the vehicle, and each outrigger is slid. In the outrigger device having each slide / jack selection means for individually selecting whether to operate or to operate the jack, each slide / jack selection means has each slide / jack selection valve and each slide / jack selection valve neutral. Each switching lever that switches to the three positions of the slide operation area and the jack operation area on both sides, and each switching lever is installed in the same posture and operated in the same direction when viewed from a predetermined direction. On the other hand, at the installation positions of the respective switching levers, there are two The lever interlocking guide with bar abutting material is installed so that it can be displaced in the switching lever operating direction, and the distance between the two lever abutting materials in the lever interlocking guide is set to the slide operation side end position and It is characterized in that it is set to an interval where only the range from the jack operation side end position to the neutral range can be operated.

  In general, most outrigger devices installed on a work vehicle are provided with four outriggers on the front, rear, left and right sides of the vehicle, but there are also outriggers provided only on the front side of the vehicle (two on the left and right). The malfunction prevention device for the outrigger device can also be applied to an outrigger provided only on the front side of the vehicle.

  Each outrigger has a slide beam that appears and disappears to the side of the vehicle, and a jack that hangs downward from the tip of the slide beam. The slide beam is slid by the slide cylinder (extension / storage operation), and the jack is jacked (extension / retraction operation) by the jack cylinder.

  As the operation device for each outrigger, there are a slide / jack selection means for individually selecting whether each outrigger is to be slid or jacked, and an expansion / removal for switching each cylinder (slide cylinder and jack cylinder) between the expansion side and the reduction side. Reduction switching means.

  Each slide / jack selection means has a slide / jack selection valve (hereinafter simply referred to as a selection valve) and a switching lever for switching the selection valve. Each slide / jack selection means may be operated at one position at the rear position of the vehicle, or may be operated at two positions on the left and right sides of the vehicle. In the case where each slide / jack selection means is operated at the rear position of the vehicle, only one switching lever is required, and in the case where each slide / jack selection means is operated from the left and right side positions of the vehicle, Two switching levers are provided on the left and right sides in an interlocked state.

  Each selection valve is generally provided with a notch mechanism for holding the spool at the neutral position and the slide operation side end position and the jack operation side end position on both sides thereof. The position is held at each position. Each switching lever may stop at a position where the spool is not held by the notch mechanism.

  The switching levers of the slide / jack selection means may be arranged in parallel in the horizontal direction or in the vertical direction, but operate in the same posture and in the same direction when viewed from a predetermined direction (horizontal direction or vertical direction). It is installed in the state to be done. Each switching lever can actuate each selection valve in a range between a slide operation side end position and a jack operation side end position on both sides of the neutral position. Each switching lever is located at the same position (the same operation position) with respect to each selection valve in a state where it is at the same position when viewed from the direction orthogonal to the operation direction.

  The lever interlocking guide is for interlocking each switching lever with a predetermined idle range, and when any one of the switching levers is operated with respect to the other switching lever beyond the predetermined idle range, All of the switching levers function so as to be forcibly moved in the operation direction of the operation side switching lever.

  Specifically, in the lever interlocking guide, two lever abutting materials are arranged at predetermined positions (intervals to be described later) at two positions straddling each switching lever before and after the operation direction. The guide is installed so that it can be displaced in the operation direction of the switching lever. The interval between the two lever abutting members (the interval between the opposing surfaces) is an interval at which the switching lever can only operate within the range from the slide operation side end position and the jack operation side end position to the neutral range.

  And the malfunction prevention apparatus of the outrigger apparatus which concerns on invention of Claim 1 of this application functions as follows. In order to operate the outrigger device, first, the slide / jack selection means selects whether the outrigger (part or all) to be operated is to be slid or jacked. At that time, the switching of the slide / jack selection means is performed. Operate the lever to the stroke end in the desired operation direction (for example, slide operation side). The switching lever operated at this time pushes the lever abutting material on one side (operating direction) of the lever interlocking guide, and accordingly, the lever interlocking guide is displaced to the switching lever operating side, and the other lever (counter operating direction side) The abutting material is displaced to a position where the other (non-operating side) switching lever is positioned in the neutral range. Therefore, even if the switching lever on the non-operating side remains on the non-operating side (for example, the jack operating side), the switching lever on the non-operating side is forcibly moved to the neutral zone by the lever abutting material on the counter operating direction side. Will come to let you.

  Thus, in the malfunction prevention device for the outrigger device according to claim 1 of the present application, when any one of the switching levers is operated to the stroke end in the desired operation direction, all of the other switching levers are selected on the counter-operation side. Therefore, even if the expansion / reduction switching means is operated, the outriggers do not simultaneously perform different types of operations (slide operation and jack operation).

[Invention of claim 2 of the present application]
According to a second aspect of the present invention, there is provided a malfunction prevention device for an outrigger device, wherein an outrigger having a slide beam using a slide cylinder and a jack using a jack cylinder is installed on the left and right sides of the vehicle, and each outrigger is slid. In the outrigger device having each slide / jack selection means for individually selecting whether to perform the operation or jack operation, each selection state detection means for detecting the selection state of each slide / jack selection means, and each selection state detection means Each selection state detected in step 6 is a heterogeneous selection determining unit that determines whether or not a slide operation selection and a jack operation selection exist at the same time, and the different type selection determination unit simultaneously includes a slide operation selection and a jack operation selection. Actuate against the action restricting means that disables the outrigger when it is determined It is characterized in that is provided and an output means for outputting a control signal.

  The basic configuration of the outrigger device portion in the invention of claim 2 is the same as the outrigger device of the invention of claim 1.

  According to the second aspect of the present invention, the selection state of each slide / jack selection means is detected by each selection state detection means. As this selection state detection means, for example, a selection valve (slide / jack selection) is used. It is possible to employ a detector for detecting that the spool of the valve is located in the slide operation area and the jack operation area. Each of the detectors outputs a detection signal to the different type selection determination means when the spool of the selection valve is slightly disengaged from the neutral region to the slide operation region side or the jack operation region side.

  The heterogeneous selection determining means receives a detection signal from each selection state detecting means (detector) and determines whether or not the slide operation selection and the jack operation selection exist at the same time. When the two operation selections exist at the same time, the heterogeneous selection determination unit is turned ON, and when both the operation selections do not exist at the same time, the different type selection determination unit remains OFF.

  The output means outputs an operation restriction signal to the operation restriction means of the outrigger when the different type selection determination means determines that the slide operation selection and the jack operation selection exist simultaneously.

  Note that when the operation restriction signal is output from the output means, the operation restriction signal may be output and a warning to inform the operator may be issued.

  The outrigger operation restricting means makes each outrigger inoperable. For example, if a solenoid type unloading valve is provided in the hydraulic circuit or the direction switching valve of the expansion / reduction switching means is a solenoid type, The direction switching valve can be used. When an operation restriction signal is issued from the output means to the operation restriction means, the supply of hydraulic oil to the slide cylinder and jack cylinder of each outrigger is stopped.

  In the malfunction prevention device for an outrigger device according to the second aspect of the present invention, the selection states of the slide / jack selection means (each selection valve) are all the same type (either slide operation selection or jack operation selection). In the case of only one selection state and neutral selection, the normal outrigger operation can be performed while the different type selection determination means remains OFF, and the selection state of each slide / jack selection means (each selection valve) is the slide operation selection and the jack operation selection. If both are present, the heterogeneous selection determination means is turned on and the outrigger operation is prohibited.

  Therefore, in the malfunction prevention device for the outrigger device according to claim 2 of the present application, when each slide / jack selection means is in the different type selection state (when both the slide operation selection and the jack operation selection are present), the different type selection determination means. The output means and the operation restricting means are operated, and each outrigger does not operate even if the expansion / reduction switching means is operated.

[Effect of the invention of claim 1 of the present application]
In the malfunction prevention device for an outrigger device according to the first aspect of the present invention, a lever interlocking guide is provided in each switching lever portion of each slide / jack selection means, so that any one switching lever can be operated in a desired operation direction. When the operation is performed up to the stroke end, all of the other switching levers do not remain in the selection position on the counter-operation side (each selection valve does not exist at the slide operation selection position and the jack operation selection position at the same time).

  Therefore, the invention according to claim 1 of the present application has an effect that the outrigger operation is ensured in safety without causing the outriggers to simultaneously perform different kinds of operations (slide operation and jacking operation) by an operation due to human carelessness.

  According to the first aspect of the present invention, when the outrigger operation is performed, even if the switching lever is in an inappropriate position, it can be automatically displaced to the appropriate position by the lever interlocking guide. There is also an effect that it is performed by stopping.

[Effect of the invention of claim 2 of the present application]
In the malfunction prevention device for an outrigger device according to the invention of claim 2 of the present application, when each slide / jack selection means is in a different type selection state (when both a slide operation selection and a jack operation selection are present), a different type selection determination is made. Even if the expansion / reduction switching means is operated by the means, the output means, and the operation restricting means, each outrigger does not operate.

  Therefore, in the invention of claim 2, when any one of the slide / jack selection means (each selection valve) is in an inappropriate position (different type selection position), the outrigger operation is disabled and the unexpected dangerous operation is performed. (Simultaneous operation of the outrigger slide operation and the jack operation) can be avoided, and the safety of the outrigger operation can be ensured.

  Hereinafter, an embodiment of the present invention (outrigger malfunction prevention device) will be described with reference to FIGS. 1 to 7. FIGS. 1 to 3 show a first embodiment corresponding to claim 1 of the present application. 4 to 7 show a second embodiment corresponding to claim 2 of the present application. In addition, each embodiment of this application is demonstrated using FIG.8 and FIG.9 together.

[First Embodiment]
The malfunction prevention device for an outrigger device according to the first embodiment shown in FIGS. 1 to 3 is provided in the outrigger device for an aerial work vehicle shown in FIG. 8, for example. The outrigger device used in the first embodiment is redundantly described with the conventional example in FIGS. 8 to 13, but is configured as follows.

  The outrigger device equipped in the aerial work vehicle of FIG. 8 is provided with outriggers 2A to 2D at four locations on the front and rear, left and right of the vehicle 1, respectively, and an outrigger operating device A shown in FIG. Is installed. The operating device A is installed in a storage box 18 at the center of the rear of the vehicle, and covers the opening of the storage box 18 with a lid 19 (FIG. 2) when not in use.

  As shown in FIG. 9, each of the outriggers 2 </ b> A to 2 </ b> D has a slide beam 3 and a jack 4 attached to the tip of the slide beam. Each slide beam 3 is configured such that the inner box 32 in the outer box 31 can be moved in and out by the slide cylinder 33 to the side of the work vehicle. Each jack 4 can move the inner box 42 in the outer box 41 up and down by a jack cylinder 43.

  Each of the outriggers 2A to 2D is operated by the operating device A shown in FIGS. 1 and 2, but the operating device A of FIGS. 1 and 2 has a slide cylinder 33 (FIG. 9) in each of the outriggers 2A to 2D (FIG. 8). ) Or the jack cylinder 43 (FIG. 9) to be operated, each slide / jack selection means 5A to 5D, and expansion / reduction switching for switching the selected cylinder (33, 43) between the expansion side and the reduction side. And means 6.

  Each of the slide / jack selection means 5A to 5D is configured such that a slide / jack selection valve (simply referred to as a selection valve) 51 can be switched by a switching lever 56. Each slide / jack selecting means 5A to 5D in FIG. 2 turns off the selection valve 51 when the switching lever 56 is positioned at the neutral position N in the center, and the switching lever 56 is moved upward as indicated by reference numeral 56 '. The selector valve 51 is connected to the operating side of the slide cylinder 33 when it is positioned at the moving position (slide operation position) S, and the selector valve 56 is positioned at the downward movement position (jack operation position) J as indicated by reference numeral 56 ″. 51 is connected to the operation side of the jack cylinder 43. Each selection valve 51 holds the spool 52 in the neutral position, the slide operation side end position and the jack operation side end position on both sides thereof. Notch mechanisms (53, 54) are provided, and the switching levers 56 are held at their respective positions in normal operation. Each switching lever 56 is sometimes spool 52 is stopped at a position that is not held in place by a notch mechanism (53, 54).

  For one outrigger (2A to 2D), only one of a slide operation and a jack operation can be selected by the slide / jack selection means (5A to 5D), but each outrigger 2A to 2D has a slide / jack selection means 5A. The slide operation and the jack operation can be individually selected by 5D.

  On the other hand, the expansion / reduction switching means 6 supplies or reduces the hydraulic oil from the hydraulic pump 21 (FIG. 12) to the expansion side of the cylinder (33, 43) by operating the direction switching valve 61 with the operation lever 66. It can be switched to supply to the side. Note that the outrigger device of the first embodiment is also operated by the hydraulic circuit shown in FIG.

  Then, the operating device A of the outrigger device selects the slide / jack selection means 5A-5D of the outriggers 2A-2D to be operated to a predetermined side, and then switches the expansion / reduction switching means 6 in a predetermined direction. The desired operation can be performed on the desired outrigger. Further, when operating only a specific outrigger (for example, the two on the front side), the slide / jack selection means (selection valve) of the other outrigger (for example, the two on the rear side) is extended / reduced in a neutral state. The switching means 6 is switched in a predetermined direction.

  The switching levers 56, 56,... Of the slide / jack selection means 5A to 5D are juxtaposed in the left-right horizontal direction, and are operated in the same posture and in the same direction when viewed from the side of the vehicle in the horizontal direction. It is installed in. A lever base 57 is fixed to the lower ends of the switching levers 56, 56... The lever base 57 is pivotally supported by a pin 58 at the tip of the spool 52 of the selection valve 51 and the lever. The lower end of the base 57 is pivotally supported on the fixed side by a pivot pin 59. Therefore, as shown in FIG. 2, each of the switching levers 56, 56,... Can swing in the vertical direction (there is an element in the front-rear direction) around the pivot pin 59, thereby the spool of the selection valve 51. 52 can be pushed and pulled.

  In the normal operation, the spool 52 of each selection valve 51 is held in the neutral position, the slide operation side end position, and the jack operation side end position by the notch mechanisms 53 and 54, respectively. As shown in FIG. 2, each switching lever 56 is also held at three positions: a neutral position N at the center position in the vertical direction, an upper slide operation side end position S, and a lower jack operation side end position J. It has become so. Each switching lever 56 may stop at a position where the spool 52 is not held by the notch mechanisms 53 and 54.

  In the first embodiment, the lever interlocking guide 7 is provided at the installation position of each switching lever 56, 56,... As a malfunction prevention device for the outrigger device.

  1 and 2, the lever interlocking guide 7 has a pair of side plates 73, 73 at positions sandwiching the four switching levers 56, 56,. Two (2) lever abutting materials 71 and 72 are provided in parallel at a predetermined interval in the front and rear at the upper position. The lever interlocking guide 7 pivots the lower end portions of the side plates 73, 73 to the left and right brackets 75, 75 (fixed on the lower plate of the storage box 18) by a pivot pin 74. . Accordingly, the lever interlocking guide 7 is configured such that the upper side (the portion where the lever abutting materials 71 and 72 are attached) can be swung back and forth around the pivot pin 74. In the first embodiment, since the lever interlocking guide 7 is retrofitted to the ready-made operating device A, the pivot center (the pivot pin 74) of the lever interlocking guide 7 is set to each of the switching levers 56, 56. .. is provided at a position slightly shifted rearward from the center of swing (the pivot pin 59), but the center of swing of the lever interlocking guide 7 is the center of swing of the switching levers 56, 65,. Of course, it may be a concentric position.

  As the lever abutting members 71 and 72 of the lever interlocking guide 7, round rods are used in the first embodiment. The lever abutting members 71, 72 are arranged at predetermined intervals, which will be described later, at positions that straddle the switching levers 56, 56,. As shown in FIG. 3A, the distance between the two lever abutting materials 71, 72 is the range from the slide operation side end position S to the neutral position N as shown in FIG. As shown in FIG. 3B, the switching lever 56 can operate only in the range from the jack operation side end position J to the neutral position N. Therefore, the lever interlocking guide 7 can freely move each of the switching levers 56, 56,... Within a predetermined play range, but any one of the switching levers 56 is connected to the other switching lever 56. On the other hand, when operated beyond a predetermined idle range, all the other switching levers function so as to be forcibly moved to the neutral range in the operation direction of the operation side switching lever.

  The malfunction prevention device of the outrigger device of the first embodiment functions as follows. In order to operate the outrigger device, first, the slide / jack selection means (5A to 5D) selects whether the outrigger to be operated (a part or all of 2A to 2D) is to be slid or jacked. Then, the switch lever 56 of the slide / jack selection means is operated up to the stroke end (S or J) in the desired operation direction as shown in FIG. 3 (A) or (B). When the switching lever 56 is operated to the slide operation side end S as shown in FIG. 3A, the operated switching lever 56 pushes the front lever abutting member 71 of the lever interlocking guide 7, and accordingly the lever interlocking is performed. The guide 7 is oscillated and displaced forward, and the other lever abutting member 72 is displaced to a position where the other (non-operating side) switching lever is positioned in the neutral region N as shown by the chain line. Further, when the switching lever 56 is operated to the jack operation side end J as shown in FIG. 3B, the operated switching lever 56 pushes the rear lever abutting member 72 of the lever interlocking guide 7, and accordingly the lever interlocking is performed. The guide 7 is oscillated and displaced rearward, and the other lever abutting member 71 is displaced to a position where the other (non-operating side) switching lever is positioned in the neutral region N as shown by the chain line.

  Therefore, even if the non-operating side switching lever 56 remains on the non-operating side, the counter operating side switching lever 56 is forced to the neutral region by the lever abutting material (71 or 72) on the counter operating direction side. To move.

  As described above, in the malfunction prevention device for the outrigger device of the first embodiment, when any one of the switching levers 56 is operated to the stroke end (S or J) in the desired operation direction, all of the other switching levers 56 are all operated. Does not remain in the selected position on the counter-operation side, and even when the expansion / reduction switching means 6 is operated, the outriggers 2A to 2D do not simultaneously perform different types of operations (slide operation and jack operation). Therefore, it is possible to prevent a trouble that the outriggers 2A to 2D simultaneously perform different kinds of operations due to an operator's careless operation. In the first embodiment, even if the expansion / reduction switching means 6 is operated with the switching lever 56 (selection valve 51) being in an inappropriate position, the inappropriate switching lever is automatically set appropriately. Since it can return to a position (neutral zone N), it can be operated as it is, without stopping operation of an outrigger device.

[Second Embodiment]
The malfunction prevention device for the outrigger device of the second embodiment shown in FIGS. 4 to 7 uses the same outrigger device (FIGS. 8 and 9) as in the first embodiment, and each slide / jack selection means. Whether the selection valves 51, 51... Are selected electrically (slide operation selection or jack operation selection) and whether slide operation selection and jack operation selection exist simultaneously based on the detection signal. It is determined whether or not the outriggers 2A to 2D are erroneously operated by disabling the outriggers 2A to 2D when the slide operation selection and the jack operation selection exist at the same time. .

  The basic configuration of the outrigger device used in the second embodiment is the same as that of the first embodiment (and the conventional example), and thus the above description is used.

  As shown in the block diagram of FIG. 5, the malfunction prevention device of the second embodiment includes selection state detection means 8A to 8D for detecting the selection states of the slide / jack selection means 5A to 5D, respectively, Different selection selection means 9 for determining whether or not a slide operation selection and a jack operation selection exist at the same time as the selection states detected by the selection state detection means 8A to 8D, and the different selection selection means 9 There is provided an output means 10 for outputting an operation restriction signal to the operation restriction means 11 for disabling the outriggers 2A to 2D when it is determined that the selection and the jack operation selection exist at the same time.

  In the second embodiment, as the selection state detecting means 8A to 8D, as shown in FIG. 4, the movement of the selection valves 51, 51,. The body 83 is provided, and the position of the moving body 83 is detected by the two front and rear detectors 81 and 82, so that the selection state of the selection valve 51 (neutral region, slide operation region or jack operation region in FIG. 13) is determined. We adopt what we did. In FIG. 4, only a part of the selection valve 51 of the slide / jack selection means 5C is disclosed, and the moving body 83 and the detectors 81 and 82 are displayed, but reference numerals 5A, 5B, and 5D are shown. Similarly, the movable body 83 and the detectors 81 and 82 are provided in the selection valve 51 of each slide / jack selection means.

  In each of the selection state detecting means 8A to 8D, when the spool 52 is located in the neutral region, both the front and rear detectors 81 and 82 are OFF (the detection signals are not emitted from both detectors). 7 (A), when the spool 52 moves out of the neutral range and moves to the front side (jack operation side) even slightly, the front detector 81 issues an ON signal, and the spool 52 is neutral as shown in FIG. 7 (B). The rear detector 82 emits an ON signal when it moves to the rear side (slide operation side) even if it is out of the range. The ON signals from these front and rear detectors (4 each) 81 and 82 are respectively input to the different type selection determining means 9. It should be noted that the front and rear detectors 81 and 82 cannot be turned on at the same time.

  The heterogeneous selection determining means 9 identifies the ON signal from the front detector (four) 81 and the ON signal from the rear detector (four) 82 as different signals. Then, when there is no ON signal from each detector and only one type of ON signal, the heterogeneous selection determining means 9 remains OFF, and when the heterogeneous signals are simultaneously input, the heterogeneous selection determining means 9 Turns on.

  The output means 10 outputs an operation restriction signal to the operation restriction means 11 of the outrigger when the different kind selection judgment means 9 is turned on (when the different kinds of signals are recognized simultaneously).

  In the second embodiment, a solenoid-type unload valve 11 is provided in the hydraulic circuit of FIG. When an operation signal is issued from the output means 10 to the operation restricting means (unload valve) 11, the hydraulic oil from the hydraulic pump 21 is unloaded, and the slide cylinders 33 and jack cylinders 43 of the outriggers 2 </ b> A to 2 </ b> D. In contrast, the supply of hydraulic oil is stopped.

  Thus, in the malfunction prevention device for the outrigger device of the second embodiment, the selection states of the slide / jack selection means 5A to 5D (the selection valves 51) are all the same type (either slide operation selection or jack operation selection). On the other hand, in the case of either one of the selection state and the neutral selection only, the normal outrigger operation can be performed with the different type selection determination means 9 being OFF, and the slide / jack selection means 5A to 5D (each selection valve 51) When the selection state includes both the slide operation selection and the jack operation selection, the different type selection determination means 9 is turned on to prohibit the outrigger operation.

  Accordingly, when each of the slide / jack selection means 5A to 5D is in the different type selection state (when both the slide operation selection and the jack operation selection are present), the different type selection determination means 9, the output means 10, and the operation restriction means ( Even if the unloading valve 11 is operated and the extension / reduction switching means 6 is operated, the outriggers 2A to 2D are not operated (the safety of the outrigger device is ensured).

It is a top view of an outrigger operation device portion provided with a malfunction prevention device of an outrigger device of a 1st embodiment of this application. It is an II-II arrow line view of FIG. It is function explanatory drawing of the malfunction prevention apparatus of the outrigger apparatus of 1st Embodiment of this application. It is a top view of the outrigger operation device part provided with the malfunction prevention device of the outrigger device of a 2nd embodiment of this application. It is a block diagram of the malfunction prevention apparatus of the outrigger apparatus of 2nd Embodiment of this application. It is a hydraulic-circuit figure of this-application 2nd Embodiment outrigger apparatus. It is function explanatory drawing of the malfunction prevention apparatus of the outrigger apparatus of 2nd Embodiment of this application. It is a top view of a general working vehicle with an outrigger device. FIG. 9 is an enlarged rear view of the outrigger extended state in the work vehicle of FIG. 8. It is a top view of the conventional outrigger operating device part. It is a XI-XI arrow line view of FIG. FIG. 9 is a hydraulic circuit diagram of an outrigger device portion in the work vehicle of FIG. 8. It is function explanatory drawing of the slide / jack selection valve used for an outrigger apparatus.

Explanation of symbols

  1 is a vehicle, 2A to 2D are outriggers, 3 is a slide beam, 4 is a jack, 5A to 5D is a slide / jack selection means, 6 is an extension / reduction switching means, 7 is a lever interlocking guide, and 8A to 8D is a selection state detection. , 9 is a different type selection judging means, 10 is an output means, 11 is an operation regulating means (unload valve), 33 is a slide cylinder, 43 is a jack cylinder, 51 is a slide / jack selection valve, 52 is a spool, 56 is a switch A lever, 61 is a direction switching valve, 71 and 72 are lever abutting materials, 81 and 82 are detectors, and A is an operating device.

Claims (2)

Outriggers (2A to 2D) having a slide beam (3) using a slide cylinder (33) and a jack (4) using a jack cylinder (43) are installed on the left and right of the vehicle (1), and each outrigger ( 2A to 2D) In the outrigger device provided with each slide / jack selection means (5A to 5D) for individually selecting whether to slide or jack.
The slide / jack selection means (5A to 5D) include a slide / jack selection valve (51, 51,...) And a slide / jack selection valve (51, 51,. Switch levers (56, 56,...) For switching to three positions of a slide operation area and a jack operation area in
The switching levers (56, 56,...) Are installed in the same posture and operated in the same direction when viewed from a predetermined direction,
A lever having two lever abutting members (71, 72) straddling the switching levers (56, 56,...) Before and after the operation direction at the installation positions of the switching levers (56, 56,...). The interlocking guide (7) is installed so that it can be displaced in the direction of operation of the switching lever.
The distance between the two lever abutting members (71, 72) in the lever interlocking guide (7) is such that the switching lever (56, 56,...) Extends from the slide operation side end position and the jack operation side end position to the neutral region. Is set to an interval that can operate only in the range of
A malfunction prevention device for an outrigger device characterized by the above. Outriggers (2A to 2D) having a slide beam (3) using a slide cylinder (33) and a jack (4) using a jack cylinder (43) are installed on the left and right of the vehicle (1), and each outrigger ( 2A to 2D) In the outrigger apparatus provided with each slide / jack selection means (5A to 5D) for individually selecting whether to slide or jack.
Each selection state detection means (8A to 8D) for detecting the selection state of each slide / jack selection means (5A to 5D), and each selection state detected by each selection state detection means (8A to 8D) The different type selection judging means (9) for judging whether or not the slide operation selection and the jack operation selection exist at the same time, and the different kind selection judgment means (9) simultaneously exists for the slide operation selection and the jack operation selection. And an output means (10) for outputting an operation restriction signal to the operation restriction means (11) for disabling the outriggers (2A to 2D) when it is determined.
A malfunction prevention device for an outrigger device characterized by the above.

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