JP6434734B2 - Outrigger holding device and vehicle-mounted crane including the same - Google Patents

Description

  The present invention relates to an outrigger holding device that is suitably used for an outrigger mounted on a work vehicle such as a truck on which a crane or the like is mounted, and holds the storage position of the outrigger.

  A telescopic outrigger equipped in this type of work vehicle includes a hollow outer box fixed to the work vehicle, an inner box fitted in the outer box, and a vertical outrigger box provided at the tip of the inner box. With. The inner box is slidable to an overhanging position protruding from the outer box to the side of the work vehicle and a storage position stored in the outer box, and the vertical outrigger box is vertically expanded and contracted to float below itself. Can be grounded (see, for example, Patent Document 1).

  When the outrigger is extended, the inner box is extended to the side of the vehicle body, and the vertical outrigger box is extended to ground the float. When storing the outrigger, the vertical outrigger box is reduced and the inner box is stored in the outer box. By the way, this type of outrigger has a slight gap between the telescopic outer box and the inner box. Therefore, when the work vehicle travels, the inner box becomes loose and causes vibration and noise. Therefore, in the technique described in Patent Document 1, a backlash prevention device for preventing backlash of the inner box is provided.

  As shown in FIG. 11A, the rattle prevention device described in this document has a bracket 101 attached below the end of the outer box 1. The bracket 101 is provided with a lever 102 having an engaging claw 111, and the lever 102 can be rotated by a manual operation of an operator. The vertical outrigger box 3 is provided with a seat 103 having a hooking hole 121. The receiving seat 103 is provided so that the engagement hole 121 can be engaged with the claw 111 of the lever 102 when the inner box 2 is in the retracted position (the state shown in FIG. In the rattle prevention device described in the document, the rotation range of the lever 102 is restricted by the lever stopper 104 on the side opposite to the vertical outrigger box 3, but on the side of the vertical outrigger box 3. Is not restricted.

  According to the rattle prevention device described in the document, when the outrigger is stored, the operator stores the inner box 2, and when the inner box 2 is in the storage position, the operator operates the lever 102 on the outer box 1 side by hand, Is engaged with the engagement hole 121 of the receiving seat 103, so that the storage position of the inner box 2 can be maintained (hereinafter also referred to as "lock"). When the outrigger is extended, the operator manually operates the lever 102 to remove the claw 111 from the engagement hole 121 of the receiving seat 103 before extending the inner box 2, as shown in FIG. Thus, the lock | rock of the inner box 2 can be cancelled | released and the inner box 2 can be projected to the side of a working vehicle.

JP 2001-130387 A

  However, the backlash prevention device described in Patent Document 1 is operated by the operator by hand in the operation of locking and releasing the inner box 2 in addition to the main operation of extending and storing the outrigger. There is a need. Therefore, there is a problem that the lock operation by each manual operation is troublesome and the operator may forget to lock.

  Further, in the rattle prevention device described in this document, the rotation range of the lever 102 is not limited to the vertical outrigger box 3 side from the position at the time of locking. Therefore, when the inner box 2 is extended, due to an erroneous operation of the lever 102, as shown in FIG. 11C, the lever 102 rotates excessively beyond the position at the time of locking (the position indicated by the two-dot chain line) There is a problem that the inner box 2 cannot be locked at the expected position when the outrigger is stored. Further, when the operator rotates the lever 102 to the lock position at a position before storing the inner box 2 to the storage position, the claw 111 of the lever 102 is moved vertically as shown in FIG. There is a problem that the rattling prevention device may be damaged by colliding with the receiving seat 103 on the outrigger box 3 side.

  Therefore, the present invention has been made paying attention to the above-mentioned problems, and restricts the rotation of the operation lever outside the assumed range and automatically locks the inner box when the outrigger is stored. It is an object of the present invention to provide an outrigger holding device that does not require manual operation for locking and prevents forgetting to lock, and a vehicle-mounted crane including the same.

  In order to solve the above-described problem, an outrigger holding device according to one aspect of the present invention includes a hollow outer box fixed to a work vehicle, and is fitted into the outer box and protrudes to the side of the work vehicle. An inner box that is slidably movable to an extended position and a storage position stored in the outer box, and a vertical outrigger box that is provided at the tip of the inner box and extends and contracts vertically so that the lower float can be grounded. An outrigger holding device used for an outrigger having an operation lever provided on the outer box side and rotated by an operator's manual operation and having a hook for engagement, and provided on the vertical outrigger box side and the inner box Is provided to be engageable with the hook of the operation lever when in the retracted position. A receiving seat having a coaxial shaft, a rotation restricting mechanism for restricting a rotation range of the operation lever to a range from an operation lever stop position to a lock position added a predetermined angle from the unlocking position, and manually operating the operation lever A posture holding mechanism that holds the posture in the unlocked position when the inner box is extended by a predetermined amount until it is disengaged from the position where it can be engaged, and the inner box And an automatic engagement mechanism for engaging the hook with the engagement shaft by rotating the operation lever at the lock position in conjunction with the storage operation.

According to the outrigger holding device of one aspect of the present invention, the rotation restricting mechanism restricts the rotation range of the operation lever to a range from the operation lever stop position to the lock position with a predetermined angle further than the lock release position. Therefore, it is possible to limit the rotation of the operation lever beyond the expected range. A stop position obtained by adding a predetermined angle to the unlocking position of the operation lever is defined as an “operation lever stop position”.
Here, in the outrigger holding device according to an aspect of the present invention, the rotation restricting mechanism includes a release position restricting pin that abuts at a position where the operation lever is rotated by a predetermined angle in the unlocking direction beyond the unlocking position. It is preferable that the operation lever has a lock position regulating pin that contacts at the lock position rotated by a predetermined angle in the lock direction.

  Such a configuration is suitable for configuring the rotation restricting mechanism. In other words, the unlocking position restricting pin rotates the operating lever only in the unlocking direction (for example, counterclockwise) to the operating lever stop position obtained by adding a predetermined angle to the unlocking position. In the lock direction, it does not rotate beyond the lock position. Therefore, it is suitable for restricting the rotation of the operation lever outside the assumed range with a simple configuration. When unlocking, the operator can easily unlock the inner box by manually rotating the operation lever to the unlock position or higher.

  Furthermore, according to the outrigger holding device according to one aspect of the present invention, when the posture holding mechanism manually rotates the operation lever to the unlocked position, the inner box holds the posture at the unlocked position by a predetermined amount. Since it is held until it is released from the position where it can be engaged, the operation lever will not return to the locking direction even if the operator releases the operation lever after the operator operates the operation lever. In addition, the posture of the operation lever at the unlocked position is maintained. Therefore, workability when pulling out the inner box can be improved.

  Here, in the outrigger holding device according to one aspect of the present invention, the posture holding mechanism is a first biasing device that constantly applies a biasing force to the operation lever in a locking direction that is opposite to the unlocking direction. A posture of the operation lever in the unlock position is maintained by the second biasing spring when the operation lever is rotated to the unlock position where the hook is released from the spring and the engagement shaft. A posture maintaining plate provided on the seat; the posture maintaining plate is rotated in response to a rotation operation of the operation lever when the inner box is in a retracted position; Is in contact with the regulated surface at the lower part of the operating lever, and is configured to maintain the attitude of the operating lever at the unlocked position within the range of the regulating surface of the attitude maintaining plate. Rukoto preferred.

  Such a configuration is suitable for configuring the posture holding mechanism. That is, since the first urging spring that constantly urges the operation lever in the lock direction is provided, the operation lever is always urged in the lock direction (for example, clockwise). And since it has the attitude | position maintenance board provided in the receiving seat so that the attitude | position in the lock release position of an operation lever may be maintained with a 2nd biasing spring, when an operation lever rotates to a lock release position, When the operating lever is rotated to the release position, the posture maintaining plate provided in the seat on the vertical outrigger box side rotates in response to the rotating operation of the operating lever, and the regulating surface of the posture maintaining plate is It will be in the state contact | abutted with the lower regulated surface. Thereby, the lock release position of the operating lever is maintained within the range of the width of the regulating surface of the posture maintaining plate. Therefore, after the operator operates the operation lever, even if the operator releases his / her hand from the operation lever, the operation lever does not return to the locking direction and the unlocking position of the operation lever is maintained. Next, when the inner box is pulled out beyond the width of the restriction surface of the posture maintaining plate, the contact state between the operation lever and the posture maintaining plate is released. Therefore, the operating lever can be rotated clockwise by the force of the biasing spring, and the operating lever can be returned to the lock position.

  Furthermore, according to the outrigger holding device according to one aspect of the present invention, the automatic engagement mechanism rotates the operation lever in conjunction with the retracting operation of the inner box to engage the hook with the engagement shaft. Since the inner box is automatically locked at the time of storage, a manual operation required to lock the inner box is not necessary, and forgetting to lock can be prevented as compared with the technique described in Patent Document 1.

Here, in the outrigger holding device according to one aspect of the present invention, the automatic engagement mechanism is formed on the outer surface of the hook of the operation lever when the inner box is moved to the storage position. It is preferable to have a cam surface that abuts in the opposite direction to the shaft and rotates the operation lever in the unlocking direction.
Such a configuration is suitable for configuring the automatic engagement mechanism. In other words, when moving the inner box to the retracted position, it has a cam surface that contacts the outer surface of the hook of the operating lever in the opposite direction to the engagement shaft and rotates the operating lever in the unlocking direction. When the inner box is retracted, the operation lever rotates by a predetermined angle in the unlocking direction (for example, counterclockwise) while the cam surface of the hook of the operation lever is pushed by the engagement shaft. When the cam is stored, the cam surface is not pushed by the engagement shaft and rotates in the locking direction (for example, clockwise) so that the engagement shaft engages with the engagement hook. it can. Therefore, it is suitable for automatically locking the inner box in conjunction with the storing operation of the inner box.

  Further, when the outer surface of the hook of the operation lever and the engagement shaft function as a cam mechanism, when the uppermost portion of the engagement shaft exceeds the tip of the claw portion of the hook, the maximum lift of the cam function If the control lever is tilted to the maximum, and the regulated surface at the bottom of the control lever is not in contact with the posture maintaining plate at the maximum tilt, “automatic engagement” Since the “posture holding mechanism” does not interfere with the automatic engagement operation by the mechanism, it is more suitable for automatically locking the inner box in conjunction with the retracting operation of the inner box.

Moreover, in order to solve the said subject, the vehicle-mounted crane which concerns on 1 aspect of this invention is a vehicle-mounted crane provided with an outrigger, Comprising: The said outrigger is an outrigger holding device which concerns on any one aspect of this invention. It is characterized by having.
According to the vehicle-mounted crane according to one aspect of the present invention, since the outrigger includes the outrigger holding device according to any one aspect of the present invention, the outrigger is restricted from rotating outside the assumed range of the operation lever. During storage, the inner box is automatically locked, so that manual operation for locking is unnecessary, and forgetting to lock can be prevented.

  As described above, according to the present invention, the rotation of the operation lever outside the assumed range is limited, and when the outrigger is stored, the inner box is automatically locked, so that manual operation for locking is unnecessary. You can prevent forgetting to lock.

1 is a front view of an embodiment of a vehicle-mounted crane equipped with an outrigger holding device according to an aspect of the present invention. It is a front view (locking position) which expands and shows the part of the outrigger holding device with which the outrigger of FIG. 1 was equipped. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is explanatory drawing of operation | movement of an outrigger holding | maintenance apparatus, The figure has shown the rotation range of the operation lever. It is explanatory drawing of operation | movement of an outrigger holding | maintenance apparatus, The figure has shown the state in the middle of releasing a lock | rock. It is explanatory drawing of operation | movement of an outrigger holding | maintenance apparatus, The figure has shown the state which maintained the attitude | position in a lock release position. It is explanatory drawing of operation | movement of an outrigger holding | maintenance apparatus, The figure has shown the state which pulls out an inner box. It is explanatory drawing of operation | movement of an outrigger holding | maintenance apparatus, The figure has shown the state in the middle of storing the inner box (the operation lever is turning in the middle by a cam function). It is explanatory drawing of operation | movement of an outrigger holding | maintenance apparatus, The figure has shown the state in which the inner box is in the middle of storing (the operation lever is tilted to the maximum by the maximum lift of the cam function). It is a figure ((a)-(d)) explaining the conventional rattle prevention device.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. This embodiment is an example in which an outrigger holding device is mounted on an outrigger of a vehicle-mounted crane mounted on a work vehicle such as a truck.
As shown in FIG. 1, in this vehicle-mounted crane (hereinafter also simply referred to as “crane”) 50, a column 52 is pivotably provided on an outrigger 51, and a telescopic boom 53 is provided at the upper end of the column 52. It is pivoted freely. The column 52 is provided with a winch 54. A wire rope 55 is led from the winch 54 to the tip 53s of the boom 53, and is used for hanging loads via a pulley (not shown) of the tip 53s of the boom 53. By hooking the hook 56, the hook 56 is suspended from the tip 53s of the boom 53.

The outriggers 51 are respectively disposed on the distal end sides of the hollow outer box 1 fixed to a work vehicle (not shown), the left and right inner boxes 2 slidably fitted in the outer box 1, and the left and right inner boxes 2. The left and right vertical outrigger boxes 3 are provided.
As shown in FIG. 1, the left and right inner boxes 2 are slidable to an extended position H protruding from the outer box 1 to the side of the work vehicle and a storage position K stored in the outer box 1. ing. Each of the left and right vertical outrigger boxes 3 is extended and contracted in the vertical direction so that the lower float 4 can be grounded.

  Here, the outrigger 51 of this embodiment is provided with the outrigger holding | maintenance apparatus 10 which hold | maintains the state which stored each inner box 2 in the outer box 1, respectively. The left and right outrigger holding devices 10 are equipped with the outrigger holding device 10 on the right side of the figure on the front side of the figure, and the outrigger holding device 10 on the left side of the figure with the back side of the figure. In the following description, the right outrigger holding device 10 provided on the front side of the figure will be described, and the description of the other outrigger holding device 10 will be omitted.

The outrigger holding device 10 includes a bracket 11 attached to the outer box 1 as shown in an enlarged view of a main part in FIGS. The bracket 11 is attached to the lower surface of the end of the outer box 1.
A rubber stopper 48 is attached to the outer end surface of the bracket 11 by left and right stopper mounting bolts 49 (see FIG. 3). The stopper 48 serves as a contact portion between the outer box 1 and the vertical outrigger box 3 when the inner box 2 is stored in the outer box 1 (see FIG. 4). When the inner box 2 is housed in the outer box 1, the rubber stopper 48 is provided at the abutting portion where the vertical outrigger box 3 abuts, so that the impact at the abutment is buffered and sound is generated. Is to be prevented.

  As shown in FIG. 3, the bracket 11 supports the support shaft 18 in a horizontal posture along the vehicle front-rear direction via the position adjustment mechanism 7. A pair of rollers 47 are mounted on the support shaft 18 so as to roll apart from each other in the axial direction. Each roller 47 is in contact with the lower surface of the inner box 2 and supports the inner box 2 from below so that the inner box 2 can be smoothly extended and slid during storage. The position adjustment mechanism 7 has an adjustment bolt 41 that moves the support shaft 18 up and down. By adjusting the height of the support shaft 18 with the adjustment bolt 41, the gap between the outer box 1 and the inner box 2 is reduced. It can be adjusted.

  One end side of the support shaft 18 protrudes from the side surface of the outer box 1 to the left side in FIG. 3 (front side in FIG. 2). The support shaft 18 is formed with a male screw at the protruding tip, and the operation lever 12 is attached by a washer 57 and a nut 58. Thereby, the operation lever 12 is rotatably supported at a position protruding to the front side of the side surface of the outer box 1. As shown in FIG. 2, the operating lever 12 has an engaging hook 21 and a gripping portion 22 that projects upward so that the operator can operate it manually. It can be rotated around the shaft 18.

  Further, as shown in FIG. 2, the vertical outrigger box 3 is provided with a seat 13 having an engaging shaft 14 that protrudes horizontally toward the front side of the side surface of the outer box 1. The seat 13 is attached to the vertical outrigger box 3 by two bolts 30. The mounting holes of the bolts 30 are elongated holes extending in the left-right direction. The engaging hook 21 is formed such that the tip thereof is bent in a claw shape toward the engaging shaft 14 side. The receiving seat 13 is provided so that the engaging shaft 14 can be engaged with the hook portion of the claw-shaped tip of the hook 21 of the operation lever 12 when the inner box 2 is in the retracted position (the state shown in the figure). .

  The outrigger holding device 10 includes a rotation restricting mechanism that permits rotation of the operation lever 12 from the operation lever stop position to the lock position, which is a predetermined angle further than the lock release position, and the operation lever. When 12 is manually rotated to the unlock position, the inner box 2 is extended by a predetermined amount from the unlock position until the engagement shaft 14 is disengaged from the position where it can be engaged with the hook 21 of the operation lever 12. A holding posture holding mechanism, an automatic engagement mechanism for automatically engaging the hook 21 of the operation lever 12 with the engagement shaft 14 by rotating the operation lever 12 in conjunction with the retracting operation of the inner box 2. It has.

  Specifically, the operation lever 12 is attached to the bracket 11 so as to be rotatable around the horizontal support shaft 18 described above. A position restricting pin 17 that restricts the rotation posture of the operation lever 12 is fixed to the bracket 11 below the support shaft 18. The operation lever 12 includes a torsion coil spring as a first urging spring 19 around the support shaft 18 (see FIGS. 3 and 4). Both end portions of the first urging spring 19 are latched to the position restricting pin 17 and the operation lever 12 on the outer box 1 side. The first biasing spring 19 applies a biasing force to the operation lever 12 to rotate the operation lever 12 in the direction in which the front end side of the grip portion 22 approaches the vertical outrigger box 3 side around the support shaft 18. Yes. In other words, the force of the first urging spring 19 is constantly urged toward the operation lever 12 in the locking direction (clockwise direction in FIG. 2).

  As a result, the attitude of the operation lever 12 at the lock position of the operation lever 12 shown in FIG. 2 in a state where the inner box 2 is locked becomes the “basic position”. In this basic position, the operating lever 12 has an engaging hook 21 extending horizontally on the side of the receiving seat 13 (right side of the figure), which is the direction in which the inner box 2 projects, with the axis of the support shaft 18 as the center, A protruding first stopper portion 23 extending downward from the support shaft 18 and a protruding second stopper portion 24 extending horizontally on the opposite side of the hook 21 (left side in the figure) are provided.

As shown in FIG. 2, the operation lever 12 rotates beyond the lock position in the clockwise direction from the basic position by the stopper surface 23 c of the first stopper portion 23 contacting the position restriction pin 17. It is supposed not to. Further, the second stopper portion 24 of the operation lever 12 extends from the basic position beyond the unlock position to a predetermined angle (for example, as shown in FIG. It is provided to stop the rotation at the position rotated to α = approx. 40 °). That is, in the example of this embodiment, the position restriction pin 17 is a release position restriction pin that contacts the operation lever 12 at a position rotated by a predetermined angle in the lock release direction in which the operation lever 12 removes the hook 21 from the engagement shaft 14, and the operation lever 12 is locked. It also serves as a lock position restricting pin that contacts at a position rotated by a predetermined angle in the direction.
Here, in the present embodiment, the “rotation restricting mechanism” described in “Means for Solving the Problems” is a position where a predetermined angle is further added to the operation lever stop position, that is, the lock release position of the operation lever 12. The position restricting pin 17 which contacts the second stopper portion 24 and contacts the first stopper portion 23 at the locked position where the operation lever 12 rotates by a predetermined angle in the locking direction corresponds.

On the other hand, the seat 13 has a rectangular plate-shaped seat body 31 fixed to the side surface of the vertical outrigger box 3 by the bolt 30. The receiving body 31 protrudes along the sliding direction of the inner box 2 toward the crane body. The seat body 31 is provided with a posture maintaining plate 15 and an engagement shaft 14 made of a round bar at a position near the tip on the crane body side. The engaging shaft 14 is fixed at a position above the posture maintaining plate 15 so as to be engageable with the hook 21 of the operation lever 12. Here, when the operating lever 12 is in the basic position, when the engagement shaft 14 is positioned closer to the vertical outrigger box 3 than the outer surface 21g of the claw portion of the hook 21, the inner box 2 is moved in the retracted direction. As the slide is moved, the outer surface 21g of the claw portion of the hook 21 comes into contact with the engagement shaft 14, and the outer surface 21g of the hook 21 and the engagement shaft 14 function as a cam mechanism.
Here, in the present embodiment, the “automatic engagement mechanism” described in “Means for Solving the Problems” described above is such that the outer surface 21g of the hook 21 of the operation lever 12 contacts the engagement shaft 14 in the facing direction. In this case, the outer surface 21g of the hook 21 functions as a cam surface and the operation lever 12 is rotated in the unlocking direction.

  As shown in FIG. 2, the posture maintaining plate 15 is a rectangular plate member having long sides arranged vertically, and can be rotated around the support shaft 16 by a support shaft 16 that is horizontal with respect to the seat body 31. It is supported by. A torsion coil spring is incorporated in the portion of the support shaft 16 of the posture maintaining plate 15 as the second urging spring 20 around the support shaft 16 (see FIG. 4). Both ends of the second urging spring 20 are hooked on the seat 13 and the posture maintaining plate 15 respectively. The posture maintaining plate 15 is pressed at a position below the support shaft 16 against a stopper portion 32 formed on the seat body 31 by the second urging spring 20, and as shown in the basic position, the long side direction The posture is maintained so that the head stands upright along the vertical direction.

  And as shown in FIG. 2, the 1st stopper part 23 of the operation lever 12 has the 1st contact surface 23a and the 2nd contact surface 23b. The first contact surface 23a is formed by an inclined surface that is positioned below the first stopper portion 23 and that is downwardly inclined from the left in the figure when the operation lever 12 is in the posture at the basic position. Further, the second contact surface 23 b is formed by the vertical right side surface of the first stopper portion 23 when the operation lever 12 is in the posture at the basic position.

  On the other hand, the posture maintaining plate 15 has a first contact surface 15a and a second contact surface 15b. The first contact surface 15a of the posture maintaining plate 15 constitutes a regulating surface formed by the upper surface of the posture maintaining plate 15 in the posture of FIG. The second contact surface 15b is formed by the vertical left side surface of the posture maintaining plate 15 in the posture of FIG. The second contact surface 15b is arranged so that the upper portion contacts the second contact surface 23b of the operation lever 12 in the facing direction. The attitude maintaining plate 15 is separated from the vertical outrigger box 3 side by the second urging spring 20 from the top end side of the second contact surface 15b around the support shaft 16 (counterclockwise direction in FIG. 2). An urging force that rotates the posture maintaining plate 15 is applied to the stopper portion 32 and pressed against the stopper portion 32.

  The second contact surface 23b of the first stopper portion 23 faces the second contact surface 15b of the posture maintaining plate 15 when the operation lever 12 is in the posture at the basic position. The first contact surface 23 a of the first stopper portion 23 is a first contact surface that is a restriction surface formed on the upper surface of the posture maintaining plate 15 when the operation lever 12 is in the unlocked position. It is a regulated surface that comes into contact with the surface 15a.

  Here, in this embodiment, the “posture holding mechanism” described in “Means for Solving the Problems” is always attached in the lock direction in which the hook 21 is engaged with the engagement shaft 14 with respect to the operation lever 12. A first abutting surface 15a of the posture maintaining plate 15 upright by a first urging spring 19 that applies urging force and a urging force of the second urging spring 20 is a first abutting surface 23a at the lower part of the operation lever. A configuration in which the attitude of the operation lever 12 at the unlocked position is maintained in the range of the width of the first abutting surface 15a.

Next, the operation and effect of the outrigger holding device 10 will be described.
In the basic position shown in FIG. 2, the inner box 2 is locked by the outrigger holding device 10, and the hook 21 of the operation lever 12 is engaged with the engagement shaft 14 when the outrigger is stored. The posture of the operation lever 12 at the locked position is held by the first biasing spring 19. At this time, the second contact surface 23b of the first stopper portion 23 protruding to the lower portion of the operation lever 12 and the upper portion of the second contact surface 15b on the left side of the posture maintaining plate 15 are separated from each other by a slight gap. Opposite. Further, the position regulating pin 17 and the stopper surface 23c of the first stopper portion 23 of the operation lever 12 are also opposed to each other with a slight gap therebetween.
Here, in order to unlock the inner box 2, the operator manually rotates the operation lever 12 counterclockwise against the first biasing spring 19 as shown in FIG. 6. As a result, the first stopper portion 23 of the operating lever 12 kicks up the upper part of the second contact surface 15b of the posture maintaining plate 15 and rotates the posture maintaining plate 15 clockwise as shown in FIG.

Subsequently, when the operator further rotates the operation lever 12 counterclockwise by a predetermined angle (for example, 30 °) or more, as shown in FIG. The posture maintaining plate 15 is temporarily removed from the surface 15b, and at the same time, the posture maintaining plate 15 is rotated counterclockwise by the biasing force of the second biasing spring 20 incorporated therein and returns to the upright posture.
Next, the operator releases his hand from the grip portion 22 of the operation lever 12. Thereby, the operation lever 12 rotates clockwise by the biasing force of the first biasing spring 19 incorporated therein. However, since the posture maintaining plate 15 has returned to the upright posture, the first contact surface 23a at the tip of the first stopper portion 23 immediately contacts the first contact surface 15a at the top of the posture maintaining plate 15. Touch. As a result, as shown in FIG. 7, the attitude of the operation lever 12 is restricted to the unlocked position by the attitude maintaining plate 15. Therefore, the operation lever 12 does not return to the posture at the lock position, which is the basic position, and the posture at the lock release position shown in FIG. 7 is maintained.

  As a result, the outrigger 51 in the retracted state is in a free state in which the inner box 2 is unlocked by the operation lever 12. Therefore, the inner box 2 can be pulled out in the overhanging direction by an operator's human power or the like. When the inner box 2 is pulled out, the unlocking position of the operating lever 12 is maintained, so that the operating lever 12 does not return to the locked position by the biasing force of the first biasing spring 19. Therefore, the operator can easily pull out the inner box 2 using both hands.

Next, when the inner box 2 is pulled out beyond the width of the first contact surface 15a of the posture maintaining plate 15 (length in the sliding movement direction of the inner box 2) by the operator's human power or the like, it is shown in FIG. As described above, the first stopper portion 23 of the operation lever 12 is disengaged from the first contact surface 15 a of the posture maintaining plate 15. Therefore, the operation lever 12 is immediately rotated clockwise by the urging force of the first urging spring 19 to return to the basic position regulated by the position regulating pin 17.
Incidentally, at this time, the outer surface 21g of the claw portion of the hook 21 is located directly above the engagement shaft 14. That is, the width of the first contact surface 15 a of the posture maintaining plate 15 is such that at least the first stopper portion 23 of the operation lever 12 is disengaged from the first contact surface 15 a of the posture maintaining plate 15. It is necessary to secure a sufficient length for the locking surface on the inner side of the claw portion to be located inside the vehicle from the center of the engagement shaft 14. This is because the claw of the hook 21 is locked again.

  When the outrigger is stored after the cargo handling operation is completed, the operation lever 12 is in the basic position as shown in FIG. When the inner box 2 is slid and stored in the storage direction by the operator's human power or the like, immediately before the inner box 2 is stored, the operation lever 12 is moved to a claw portion of its own hook 21 as shown in FIG. 21 g of the outer surface of the contact member abuts on the engagement shaft 14. Thereby, the outer surface 21g of the hook 21 and the engagement shaft 14 function as a cam mechanism.

  That is, according to the sliding movement of the inner box 2 in the retracting direction, the operation lever 12 rotates counterclockwise and the hook 21 is lifted upward by the action of the cam surface of the outer surface 21g of the claw portion. When the engagement shaft 14 reaches a position where it is pushed into the storage side from the tip of the hook 21, the engagement shaft 14 is positioned on the pocket side of the hook 21. The function stops working. Therefore, the operation lever 12 is rotated clockwise by the urging force of the first urging spring 19, and the hook 21 is automatically engaged with the engagement shaft 14 as shown in FIG.

  When the outer surface 21g of the hook 21 and the engagement shaft 14 function as a cam mechanism, the cam is when the uppermost portion of the engagement shaft 14 exceeds the tip of the claw portion of the hook 21, as shown in FIG. This is when the operating lever is tilted to the maximum by the maximum lift of the function. At this time, the lower portion of the first stopper portion 23 is in a position where it does not come into contact with the second contact surface 15b of the posture maintaining plate 15. . Therefore, the “posture holding mechanism” does not interfere with the automatic engagement operation by the “automatic engagement mechanism”.

As described above, according to the outrigger holding device 10 of the present embodiment, the “rotation restricting mechanism” is locked to the position where the rotation range of the operation lever 12 is rotated by a predetermined angle in the unlocking direction beyond the unlocking position. Therefore, the rotation of the operation lever 12 outside the assumed range can be restricted.
In particular, according to the rotation restricting mechanism of the present embodiment, the operation restricting lever 12 rotates only to a predetermined angle in the unlocking direction (counterclockwise direction) by the position restricting pin 17, and further, by the position restricting pin 17, It does not rotate in the lock direction beyond the lock position. Therefore, it is suitable for restricting the rotation of the operation lever 12 outside the assumed range.

  Further, according to the outrigger holding device 10 of the present embodiment, when the “posture holding mechanism” manually rotates the operation lever 12 to the unlock position, the inner box 2 projects a predetermined amount over the unlock position. Therefore, after the operator operates the operation lever 12, even if the operator releases the hand from the operation lever 12, the operation lever 12 is locked. The unlocking position of the operation lever 12 is maintained without returning to the direction of engagement. Therefore, it is suitable for improving workability when the inner box 2 is pulled out.

  In particular, according to the posture holding mechanism of the present embodiment, the operation lever 12 is always provided in the locking direction (clockwise) because it has the urging spring 19 that constantly applies urging force in the direction in which the operation lever 12 is locked. Be energized. When the lock is released, a force for pulling the operation lever 12 is required against the urging force of the urging spring 19, but the operator rotates the operation lever 12 by hand counterclockwise to the unlock position. This is suitable for releasing the lock of the box 2.

  And since it has the attitude | position maintenance board 15 provided in the receiving seat 13 so that the release position of the operation lever 12 may be maintained when the operation lever 12 rotates to the lock release position, the operation lever 12 is rotated to the lock release position. Then, the posture maintaining plate 15 provided in the seat 13 on the vertical outrigger box 3 side rotates in conjunction with the rotation operation of the operation lever 12, and the first contact surface which is a regulating surface of the posture maintaining plate 15. 15 a comes into contact with the first contact surface 23 a at the bottom of the operation lever 12. Thereby, the unlocking position of the operation lever 12 is maintained in the range of the width of the first contact surface 15 a of the posture maintaining plate 15.

  Therefore, after the operator operates the operation lever 12, even if the operator releases his / her hand from the operation lever 12, the operation lever 12 does not return to the locking direction and the unlocking position of the operation lever 12 is maintained. Next, when the inner box 2 is pulled out beyond the width of the first contact surface 15a of the posture maintaining plate 15, the contact state between the operation lever 12 and the posture maintaining plate 15 is released, so that the operation lever 12 is biased by a biasing spring. This is suitable for rotating clockwise by the force of 19 and returning the operation lever 12 to the locked position regulated by the position regulating pin 17.

  Furthermore, according to the outrigger holding device 10 of this embodiment, the “automatic engagement mechanism” rotates the operation lever 12 in conjunction with the retracting operation of the inner box 2 to engage the hook 21 with the engagement shaft 14. Therefore, when the outrigger is stored, the inner box 2 is automatically locked, so that the manual operation required to lock the inner box 2 is unnecessary as compared with the technique described in Patent Document 1, and forgetting to lock. Can be prevented.

  In particular, according to the automatic engagement mechanism of the present embodiment, the operation lever 12 is rotated in the unlocking direction when it is formed on the outer surface of the hook 21 of the operation lever 12 and contacts the engagement shaft 14 in the opposite direction. When the outrigger is retracted, when the inner box 2 is retracted, the cam surface of the hook 21 of the operation lever 12 is pushed by the engagement shaft 14 so that the operation lever 12 is rotated counterclockwise. When the inner box 2 is retracted by rotating by a predetermined angle in accordance with the cam, the cam does not work, so the engagement shaft 14 is engaged with the hook 21 and the lock is automatically applied. Can do. Therefore, the inner box 2 can be automatically locked in conjunction with the storing operation of the inner box 2. Therefore, the automatic locking is suitable for preventing the lock from being forgotten without requiring a manual process for locking.

The outrigger holding device according to the present invention and the vehicle-mounted crane provided with the outrigger holding device are not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. .
For example, in the above-described embodiment, the vehicle-mounted crane including the outrigger holding device according to the present invention has been described as an example. However, the outrigger holding device according to the present invention is not limited to the vehicle-mounted crane and is installed in a work vehicle. As long as it is a telescopic outrigger, various outriggers can be installed.

  Further, for example, in the above-described embodiment, examples of the rotation restriction mechanism, the posture holding mechanism, and the automatic engagement mechanism included in the outrigger holding device are shown, but the configuration of each mechanism is not limited to the above-described embodiment. That is, the rotation restriction mechanism can adopt various forms as long as the rotation range of the operation lever can be regulated in both directions. Further, the posture holding mechanism can adopt various forms as long as the position can be held until the inner box is extended by a predetermined amount when the operation lever is manually rotated to the unlocking position. Further, the automatic engagement mechanism can adopt various forms as long as the hook can be engaged with the engagement shaft by rotating the operation lever in conjunction with the retracting operation of the inner box.

DESCRIPTION OF SYMBOLS 1 Outer box 2 Inner box 3 Vertical outrigger box 4 Float 10 Outrigger holding device 11 Bracket 12 Operation lever 13 Seat 14 Engagement shaft 15 Posture maintenance plate 16 Support shaft 17 Position restriction pin (release position restriction pin, lock position restriction pin)
DESCRIPTION OF SYMBOLS 18 Support shaft 19 1st urging | biasing spring 20 2nd urging | biasing spring 21 Hook 22 Grasp part 23 1st stopper part 24 2nd stopper part 30 Bolt 31 Receipt main body 32 Stopper part 50 Vehicle-mounted crane (crane)
51 Outrigger 52 Column 53 Boom 54 Winch 55 Wire rope 56 Hook H Projected position K Storage position

Claims (6)

A hollow outer box fixed to the work vehicle, an overhanging position fitted in the outer box and projecting to the side of the work vehicle, and an inner slidable to a storage position stored in the outer box An outrigger holding device used for an outrigger having a box and a vertical outrigger box that is provided at the tip of the inner box and expands and contracts in the vertical direction so that the lower float can be grounded,
An operation lever provided on the outer box side and rotated by an operator's manual operation and having a hook for engagement, and a hook of the operation lever provided on the vertical outrigger box side when the inner box is in the retracted position A receiving seat having an engaging shaft provided to be engageable with the outer box, and a lock position from an operation lever stop position which is provided on the outer box side and adds a predetermined angle to the rotation range of the operation lever from the unlock position. A rotation restricting mechanism for restricting to the range up to and a position at which the inner lever protrudes a predetermined amount when the operation lever is manually rotated to the unlocked position, and the engagement is possible until out of the position and attitude holding mechanism for holding the state of being prevented from rotating in the lock position direction, the inner box Outrigger holding device, characterized in that it comprises an automatic engagement mechanism for in conjunction with the store operation by rotating the operation lever is in said locked position engaging the hook with the engagement shaft.   The rotation restricting mechanism includes a release position restricting pin that abuts at a position rotated by a predetermined angle in the unlocking direction beyond the unlocking position, and the lock in which the operating lever is rotated by a predetermined angle in the locking direction. The outrigger holding device according to claim 1, further comprising a lock position regulating pin that abuts at a position. The posture holding mechanism includes a first urging spring that constantly applies an urging force to the operation lever in a locking direction that is opposite to the unlocking direction, and the unlocking that releases the hook from the engagement shaft. A posture maintaining plate provided on the seat so as to maintain a posture of the operation lever at the unlocked position by a second biasing spring when the operation lever is rotated to a position;
When the inner box is in the retracted position, the posture maintaining plate is rotated in response to the rotation of the operation lever, and the restriction surface of the posture maintaining plate is in contact with the restricted surface below the operation lever. The outrigger holding device according to claim 1 or 2, wherein the posture of the operation lever in the unlocked position is maintained within a range of a width of a restriction surface of the posture maintaining plate.   The automatic engagement mechanism is formed on an outer surface of a hook of the operation lever when the inner box is moved to the retracted position, and abuts the engagement lever in a facing direction to lock the operation lever. The outrigger holding device according to any one of claims 1 to 3, further comprising a cam surface that rotates in a release direction. In claim 4 dependent on claim 3,
When the outer surface of the hook of the operation lever and the engagement shaft function as a cam mechanism, the operation is performed when the uppermost portion of the engagement shaft exceeds the tip of the claw portion of the hook due to the maximum lift of the cam function. An outrigger holding device, wherein the lever is tilted to the maximum, and when the maximum tilt is reached, the regulated surface below the operation lever is in a position not in contact with the posture maintaining plate. . A vehicle-mounted crane with an outrigger,
The said outrigger has the outrigger holding | maintenance apparatus as described in any one of Claims 1-5, The vehicle-mounted crane characterized by the above-mentioned.

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