JPH0215913Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic release device for a fixing device for a movable part in an outrigger device.

The outrigger device of a mobile crane or an aerial work vehicle is provided with a double-acting hydraulic cylinder for movably relating one member to the other member and moving both members relative to each other, and A releasable fixing device is installed between one member and the other member for fixing the relative positions of the two members corresponding to the most contracted state of the double-acting hydraulic cylinder. To give a specific example, an inner cylinder is telescopically inserted into an outer cylinder, a double-acting hydraulic cylinder is internally disposed between the outer cylinder and the inner cylinder, and a double-acting hydraulic cylinder is installed between the outer cylinder and the inner cylinder. Corresponding is a telescoping beam of an outrigger device comprising a releasable fixing device for fixing the relative positions of the outer cylinder and the inner cylinder corresponding to the most contracted state of the cylinder.

Conventionally, the fixing device for the movable parts in this type of outrigger device, which is relatively moved by a double-acting hydraulic cylinder, was manually released, so the relative position of the movable part was moved by driving the double-acting hydraulic cylinder to extend. When attempting to do so, there was a problem in that the operator had to manually release the fixing device, which was a complicated operation.

The purpose of this invention is to automatically release the fixing device installed between the movable parts of the outrigger device by the extension force of a double-acting hydraulic cylinder, thereby eliminating the complexity of releasing the fixing device. It is.

In order to achieve the above object, the automatic release device for the fixing device of the movable part in the outrigger device of the present invention is provided by movably relating one member to the other member and moving the two members relative to each other between these members. A double-acting hydraulic cylinder is interposed therebetween, and a releasable fixing device is provided between one member and the other member to fix the relative position of the two members corresponding to the most contracted state of the double-acting hydraulic cylinder. The double-acting hydraulic cylinder is connected to one (or the other) member via a loose connecting device that is movable by a certain amount in the expansion and contraction direction of the double-acting hydraulic cylinder, and the double-acting hydraulic cylinder The double-acting hydraulic cylinder and the fixing device are arranged such that the fixing device is released by a relative movement of the double-acting hydraulic cylinder and one (or the other) member in the direction of expansion and contraction of the double-acting hydraulic cylinder that occurs on the coupling device when the double-acting hydraulic cylinder is extended. are constructed by interlocking and connecting them via an interlocking device.

According to the above configuration, when the double-acting hydraulic cylinder is driven to extend from the most contracted state, the movement of the double-acting hydraulic cylinder relative to one (or the other) member that occurs on the loose coupling device at the initial stage of extension causes the interlocking device to move. Since the information is transmitted to the fixing device via the signal and the fixing device can be released, the complexity of manually releasing the fixing device is eliminated.

Hereinafter, an embodiment in which the present invention is applied to a telescopic beam of an outrigger device will be described in detail based on the drawings.

(First Embodiment) In FIG. 1, a telescoping beam A includes an outer cylinder 1 horizontally mounted on a vehicle body (not shown), an inner cylinder 2 telescopically inserted into the outer cylinder 1, and an outer cylinder 1. Cylinder 1 and inner tube 2
It is comprised of a double-acting hydraulic cylinder 3 disposed internally between the cylinders and for driving the inner cylinder 2 to extend and retract with respect to the outer cylinder 1. The double-acting hydraulic cylinder 3 is equipped with a cylinder 4 and a piston rod 5 that extends and retracts from the tip of the cylinder 4. They are connected to appropriate locations on the outer cylinder 1 via connecting devices 6 and 7, respectively. Reference numeral 8 denotes a fixing device for fixing the outer tube 1 and the inner tube 2 when the telescopic beam A is in the most contracted state. A fixed pin 10 is provided in the pin storage case 9 so that its inner end can freely protrude and retract into the outer cylinder 1, and the inner end of the fixed pin 10 is inserted between the pin storage case 9 and the fixed pin 10. A spring 11 that urges the fixing pin 10 to protrude into the cylinder 1, and a pin hole 12 provided near the tip of the inner cylinder 2 at a position where the fixing pin 10 engages when the telescopic beam A is contracted to the maximum. It is equipped with The connecting device 7 that connects the double-acting hydraulic cylinder 3 to the outer cylinder 1 of the telescopic beam A includes a bracket 14 provided in the outer cylinder 1 and having a long hole 13 along the direction of expansion and contraction of the telescopic beam A, and the double-acting hydraulic cylinder 3. a connecting pin 16 that is provided on the base end bracket 15 of the cylinder 4 and that engages with the elongated hole 13;
Accordingly, the double-acting hydraulic cylinder 3 is configured to be able to move by a certain amount in the direction of expansion and contraction of the telescoping beam A. With this configuration of the coupling device 7, when the double-acting hydraulic cylinder 3 is driven to extend and the telescopic beam A is extended, the coupling pin 16 of the coupling device 7 is inserted into the elongated hole 13.
When the telescopic beam A moves toward the base end (to the right end in the figure) inside the telescopic beam A and the double-acting hydraulic cylinder 3 is driven to reduce the telescopic beam A, the connecting pin 16 of the connecting device 7 connects the telescopic beam A in the elongated hole 13. It moves toward the tip of A (left end in the figure). As a result, the double-acting hydraulic cylinder 3 moves a certain amount relative to the outer cylinder 1 in the direction of expansion and contraction of the telescoping beam A when it expands and contracts. Reference numeral 17 denotes an interlocking device, and this interlocking device controls the relative movement of the double-acting hydraulic cylinder 3 with respect to the outer cylinder 1 that occurs as the double-acting hydraulic cylinder 3 expands and contracts, and in particular drives the double-acting hydraulic cylinder 3 to extend and moves the telescopic beam. The movement of the double-acting hydraulic cylinder 3 relative to the outer cylinder 1 that occurs when A is extended is
The double-acting hydraulic cylinder 3 and the fixing device 8 are moved so as to release the fixing device 8 (the state in which the fixing pin 10 of the fixing device 8 enters the pin hole 12 of the inner cylinder 2 when the telescopic beam A is in the most contracted state). It is linked and connected. That is, the interlocking device 17 has an interlocking rod 18 whose base end is connected to the base end of the cylinder 4 of the double-acting hydraulic cylinder 3 and extends along the outside of the outer cylinder 1 to the distal end of the outer cylinder 1, and an interlocking rod 18 that extends to the distal end of the interlocking rod 18. It is composed of a cam piece 19 arranged therein. The cam piece 19 has the connecting pin 16 of the connecting device 7 connected to the elongated hole 1.
3, the fixing pin 10 of the fixing device 8 is not prevented from protruding into the outer cylinder 1 by the spring 11. When the pin 16 moves toward the proximal end of the telescopic beam A in the elongated hole 13 (towards the right end in the figure), the fixing pin 10 of the fixing device 8 is moved by the spring 1.
1 (accommodated so that the inner end of the fixing pin 10 does not protrude into the outer cylinder 1),
It is associated with the engaging portion 20 provided at the outer end of the fixing pin 10.

Next, the effect will be explained. The double-acting hydraulic cylinder 3 is driven to contract and the telescopic beam A is in the most contracted state (first
In the state shown), the connecting pin 16 of the connecting device 7
is located near the tip of the telescopic beam A in the elongated hole 13 (the cylinder 4 of the double-acting hydraulic cylinder 3 is located near the tip of the telescopic beam A), and the fixing device 8
Since the pin hole 12 of the inner tube 2 is located at a position where it can be engaged with the fixing pin 10 of Fixed in state. In this state, even if an external force is applied in a direction to extend the inner tube 2, the telescopic beam A will not extend because the fixing device 8 fixes the outer tube 1 and the inner tube 2. From this state,
When extending the telescopic beam A, the double-acting hydraulic cylinder 3 is extended. However, since the extending movement of the telescopic beam A is regulated by the fixing device 8, the extending movement of the double-acting hydraulic cylinder 3 is limited to the connecting device. 7, move the cylinder 4 of the double-acting hydraulic cylinder 3 and the connecting pin 16 toward the base end of the telescopic beam A. At the same time, the interlocking rod 18 of the interlocking device 17 moves toward the proximal end of the telescopic beam A, and the cam piece 19 disposed at the tip of the interlocking rod 18 engages with the engaging portion 20 of the fixed pin 10, thereby locking the fixed pin 10. stored in case 9,
The locking device 8 is automatically released. After the fixing device 8 is released, the telescopic beam A is extended in the same way as the previous telescopic beam. When contracting the telescopic beam A from the extended state, use the double-acting hydraulic cylinder 3.
As a result, the cylinder 4 of the double-acting hydraulic cylinder 3 and the connecting pin 16 are moved toward the tip of the telescopic beam A on the connecting device 7, and the telescopic beam A is contracted. When the telescopic beam A is in the most contracted state, the fixing pin 10 of the fixing device 8
is engaged with the pin hole 12 of the inner cylinder 2 by the spring 11 to fix the telescopic beam A in the most contracted state.

In the above embodiment, the tip end of the piston rod 5 of the double-acting hydraulic cylinder 3 is connected to a suitable position in the inner cylinder 2, and the base end of the cylinder 4 is connected to a suitable position in the outer cylinder 1 via connecting devices 6 and 7, respectively. Although the present invention is shown in the beam A, the present invention is a telescopic beam in which the mounting direction of the double-acting hydraulic cylinder 3 is opposite to the above, that is, the tip of the piston rod 5 of the double-acting hydraulic cylinder 3 is removed. Of course, it is possible to implement a telescopic beam connecting the proximal end of the cylinder 4 to a suitable position of the cylinder 1 and the inner cylinder 2 via a connecting device, respectively. In this case, the connecting device that connects the tip end of the piston rod 5 and the appropriate position of the outer cylinder 1 is connected via a connecting device that can move a certain amount in the direction of expansion and contraction of the telescopic beam, and the proximal end of the interlocking rod 18 of the interlocking device 17 is connected. It can be attached to the tip of the piston rod 5.

(Second Embodiment) In the first embodiment described above, the fixing device 8 is provided between the distal ends of the outer cylinder 1 and the inner cylinder 2, and the fixing device 8 and the double-acting hydraulic cylinder 3 are connected to each other by an interlocking device including an interlocking rod 18. As shown in FIG. 2, a fixing device 21 is provided between the proximal ends of the inner tube 2 and the outer tube 1, and an interlocking rod 18 is used as the interlocking device.
It is possible to have no. That is,
In FIG. 2, the fixing device 21 is an L-shaped metal fitting whose base end is pivotally connected to the base end of the inner cylinder 2, and when the fixing device 21 is rotated upward about the pivot connection, the tip thereof is connected to the inner cylinder 2. 2, and a positional relationship such that the tip of the L-shaped fitting 22 engages when the L-shaped fitting 22 is rotated upward when the telescopic beam A is in the most contracted state. It consists of an engaging part 23 bored in the proximal end of the outer cylinder 1. On the other hand, the interlocking device 24 includes an engaging portion 25 provided on the back of the L-shaped fitting 22 in the fixing device 21.
The L-shaped fitting 22 is a cam provided at the base end of the cylinder 4 of the double-acting hydraulic cylinder 3, and when the double-acting hydraulic cylinder 3 is located near the base end of the telescopic beam A on the coupling device 7 in the direction of expansion and contraction. When the double-acting hydraulic cylinder 3 moves toward the tip of the telescopic beam A on the coupling device 7 without engaging with the engaging portion of the L-shaped fitting 22, the double-acting hydraulic cylinder 3 engages with the engaging portion 25 of the L-shaped fitting 22 along with the movement. It consists of a cam 26 that rotates this upward. In such a configuration, by extending the double-acting hydraulic cylinder 3 from the most contracted state of the telescopic beam A (the state shown in the second figure), the fixing device 21 is automatically released, and from then on, the telescopic beam A is It extends like the previous telescopic beam. When contracting the telescopic beam A from the extended state, the double-acting hydraulic cylinder 3 is driven to contract. At this time, the double-acting hydraulic cylinder 3 is moved on the coupling device 7 toward the tip of the telescopic beam A in the telescopic direction. do. The telescopic beam A then contracts. When the telescopic beam A is brought into the most contracted state by the double-acting hydraulic cylinder 3, the tip of the L-shaped fitting 22 faces the engagement portion 23 of the outer cylinder 1, so that the L-shaped fitting 22 can be rotated upward, and the cam 26, the tip of the L-shaped fitting 22 enters the engaging portion 23, and the fixing device 21 fixes the telescopic beam A in the most contracted state.

(Third Embodiment) In the first and second embodiments described above, the connecting device that connects the double-acting hydraulic cylinder 3 to the outer cylinder 1 is a connecting device that can move a certain amount in the direction of expansion and contraction of the telescopic beam A. The connecting device that connects the double-acting hydraulic cylinder 3 to the inner cylinder 2 may be configured in this way. An embodiment in that case is shown in FIG. In FIG. 3, the structure of the fixing device 8, the interlocking device 17, and the connecting device 7 is as follows.
Since it is substantially the same as that of the first embodiment except for the mounting position, its structure and operation will be easily understood by referring to the explanation of the first embodiment.

Finally, a development example of the first embodiment will be explained based on FIG. 4.

In this developed example, the outer tube 1 and the inner tube 2 are fixed even when the telescopic beam A is in the most extended state, and this fixing is automatically operated by the telescopic movement of the double-acting hydraulic cylinder 3. That is, in addition to the configuration of the first embodiment (FIG. 1), the fixing pin 10 protrudes into a position corresponding to the fixing pin 10 in the proper position at the proximal end of the inner cylinder 2 and in the most extended state of the telescopic beam A. At the same time, the relationship between the base end of the interlocking rod 18 of the interlocking device 17 and the cylinder 4 of the double-acting hydraulic cylinder 3 is established such that the double-acting hydraulic cylinder 3 is connected to the connecting device 7 in the direction of expansion and contraction of the telescopic beam A. When the interlocking rod 18 moves along the telescopic beam A from one end to the other end, the interlocking rod 18 is pulled toward the proximal end of the telescopic beam A from its position on the distal end side in the telescopic direction, and then returned to the distal end side of the telescopic beam A. Relate as you like. The relationship between the double-acting hydraulic cylinder 3 and the base end of the interlocking rod 18 as described above is constructed as follows. That is, in FIG. 4, 28 is a connecting rod whose lower end is engaged from above with the connecting pin 16 of the connecting device 7 (this pin is connected to the double-acting hydraulic cylinder 3). 28 is designed so that when the double-acting hydraulic cylinder 3 moves from one end to the other on the coupling device 7, it is lifted upward from a lower position and then returned to the lower position again.
Reference numeral 29 denotes an intervening member between the upper end of the linking rod 28 and the base end of the linking rod 18 for transmitting the upward movement of the linking rod 28 to the linking rod 18 and moving the linking rod 18 toward the base end in the expansion and contraction direction of the telescopic beam A. This is an L-shaped link. A spring 30 is interposed between the connecting rod 28 and the outer cylinder 1 and urges the connecting rod 28 downward.
To explain the operation, when the double-acting hydraulic cylinder 3 is extended from the most contracted state of the telescopic beam A (the state shown in FIG. 4), the double-acting hydraulic cylinder 3 first moves toward the proximal end of the telescopic beam A on the coupling device 7. do. At this time, the first link rod 28 moves upward and the link rod 18
Pull to the right in the figure to release the fixing device 8. At the same time, the telescopic beam A is extended. The double-acting hydraulic cylinder 3 further moves toward the proximal end of the telescopic beam A on the connecting device 7, and accordingly the connecting rod 28 moves downward, and the interlocking rod 18 moves leftward in the figure and returns to its original position. When the interlocking rod 18 is returned to the left, the fixing pin 10 of the fixing device 8 is pressed against the spring 1.
1 is pressed against the inner cylinder 2, but since the telescopic beam A has already expanded (slightly expanded from the most contracted state), it does not engage with the engaging portion 20.
When the telescopic beam A is fully extended, the fixing pin 10 is pushed into the engaging portion 27 by the spring 11 to fix the telescopic beam A in the maximum extended state. When contracting the telescopic beam A from its most extended state, the double-acting hydraulic cylinder 3 is contracted. As a result, the double-acting hydraulic cylinder 3 moves toward the tip of the telescopic beam A on the coupling device 7. At this time, the first link rod 28 moves upward and pulls the link rod 18 to the right in the figure, fixing the pin 1.
0 from the engaging portion 27. At the same time, the telescopic beam A contracts. The double-acting hydraulic cylinder 3 is connected to the coupling device 7
At the top, the telescopic beam A moves further toward the tip, and in conjunction with this, the linking rod 28 moves downward, and the linking rod 18 moves to the left in the figure and returns to its original position. Interlocking rod 1
8 is restored to the left, the fixing pin 10 of the fixing device 8 is pressed against the inner cylinder 2 by the spring 11, but since the telescopic beam A is contracted (slightly reduced from the fully extended state), Engagement part 2
7 is not engaged. When the telescopic beam A is minimized, the fixing pin 10 enters the engaging portion 20 and fixes the telescopic beam A in the minimum contracted state.

In this developed example, the fixation of the telescopic beam A in the most contracted state and the fixation release in the most extended state can be automatically performed.

Above, an embodiment has been described in which the automatic release device of the fixing device of the movable part of the outrigger device of the present invention is implemented on the telescopic beam of the outrigger device, but the present invention is limited to implementation on the telescopic beam of the outrigger device. For example, a double-acting hydraulic cylinder is interposed between two members that are pivotally connected to each other so as to rotate the two members relative to each other around the joint. and a movable outrigger device having a releasable fixing device provided between the two members and fixing the relative rotational position of the two members about the pivot connection point corresponding to the most contracted state of the double-acting hydraulic cylinder. Of course, this can also be implemented in departments.

The automatic release device for a fixing device of a movable part in an outrigger device of the present invention, which is constructed and operates as described above, can automatically release the fixing device by the initial extension movement of a double-acting hydraulic cylinder. This eliminates the need for a release operation compared to conventional manual release type fixing devices, which reduces complexity.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment in which an automatic release device for a fixing device for a movable part in an outrigger device according to the present invention is implemented on a telescoping beam of an outrigger device, and FIGS. 2 and 3 are illustrations of the same embodiment. An explanatory diagram of an example, FIG. 4 is an explanatory diagram of a developed example of FIG. 1; One member (outer cylinder), 2; Other member (inner cylinder), 3; Double acting hydraulic cylinder, 7; Connection device, 8,
21; Fixing device; 17, 24; Interlocking device.

Claims (1)

[Scope of utility model registration request] An automatic release device for a fixing device of a movable part in an outrigger device, which includes a double-acting hydraulic cylinder for movably relating one member to the other and moving both members relative to each other. and a releasable fixing device provided between one member and the other member to fix the relative position of the two members corresponding to the most contracted state of the double-acting hydraulic cylinder, wherein the double-acting hydraulic cylinder The cylinder is connected to one (or the other) member via a loose coupling device that is movable by a certain amount in the direction of extension and contraction of the double-acting hydraulic cylinder, and when the double-acting hydraulic cylinder is extended, the coupling device is connected to the other member. The double-acting hydraulic cylinder and the fixing device are interlocked via an interlocking device so that the fixing device is released by the resulting relative movement of the double-acting hydraulic cylinder and one (or the other) member in the direction of expansion and contraction of the double-acting hydraulic cylinder. An automatic release device for a fixing device of a movable part in an outrigger device, characterized in that they are connected.