JPS6343249Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for attaching and detaching attachments such as buckets and blades to the tip of a lift arm in a shovel loader, and more particularly to a device for operating a connecting pin in the attachment and detachment device.

Generally, an attachment/detachment device for an attachment in a shovel loader is constructed as shown in FIGS. 1 and 2. That is, the coupler body 1, which constitutes the main body of the attachment/detachment device, is connected to the left and right sides of the coupler body 1 by the tips of a pair of left and right lift arms 2 installed on the vehicle body (not shown) and a pair of left and right connecting rods 3 parallel to the lift arms 2. The coupler body 1 has two vertically oriented plates 4 facing each other at regular intervals on its left and right sides.
Each of the plates 4 has engaging portions 5 and 6 on the upper and lower sides, respectively, and a connecting pin 7 is provided horizontally at approximately the middle of the plate 4.

In the attachment/detachment device configured as described above,
The attachment, for example, the bucket belt 8, is attached as follows. That is, the first
In the figure, first, with the coupler body 1 in a forward leaning position, the upper engaging portion 5 of the coupler body 1 is hooked to the hook portion 10 formed on the upper part of the bracket 9 of the bucket bag 8, and then the coupler body 1 is By tilting backward, the lower engaging part 6 of the coupler body 1 is engaged with the engaging recess 11 formed at the lower part of the bracket 9 of the bucket 8, and then the connecting pin 7 is inserted into the pin hole 9a of the bracket 9 and the plate 4. When inserted into the pin hole 4a, the bucket 8 is stably attached to the coupler body 1. Note that the bucket 8 is removed by performing operations in the reverse order of the above.

Now, regarding the operation of inserting and removing the connecting pin 7 into and out of the pin holes 4a and 9a, a hydraulic type as shown in FIG. 5 has conventionally been used. This is a hydraulic pump P
The pressure oil obtained by the above is controlled by a lever-operated control valve CV to operate a double-acting hydraulic cylinder 12 to insert and remove the connecting pin 7. However, with such hydraulic type control valves, the operating lever of the control valve CV is usually located near the driver's seat, so the driver may inadvertently touch the lever and operate it to the ejection side during work. If this happens, there is a risk that the connecting pin 7 may come off and cause the bucket to fall off, and since the connecting pin 7 is inserted and removed using hydraulic pressure, there is a risk of misalignment between the pin hole on the coupler side and the pin hole on the bucket side. When the connecting pin 7 is inserted or removed, there is a problem in that the connecting pin 7 is twisted and damaged.

An object of the present invention is to provide a pin operation device for an attachment/detachment device in a shovel loader that can eliminate the above-mentioned conventional problems.

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 4. In the attachment/detachment device shown in FIGS. 1 and 2 and configured as described above, the connecting pin 7 slidably supported by the inner plate 4 is attached to a bracket protruding from the plate 4. The link 14 is pivotally attached via a pin 15 to one side of the link 14, which is attached to the link 13 so that its substantially central portion can be tilted. A tension spring 16 is tensioned at one end of the link 14, that is, the end on the side where the connecting pin is attached, and which always biases the connecting pin 7 in the insertion direction. Further, on the other end side of the link 14, an output cylinder 17 for pulling out the connecting pin 7 by resisting the tension spring 16 is supported laterally on the coupler body 1, and the plunger 18 of the hydraulic cylinder 17 is A length-adjustable rod 19, which is pushed through the link 14, is pivotally connected to the other end of the link 14 by a pin 20.

On the other hand, an input cylinder 22 for supplying pressure oil to the output cylinder 17 via a pipe 21 and an operating lever 27 for operating the input cylinder 22 are disposed on the vehicle body side. Note that a reservoir tank 25 for oil replenishment and a check valve 26 for preventing backflow to the reservoir tank 25 are provided in the middle of the pipe 21. The operating lever 27 is formed in a cylindrical shape, and is cut at the bottom from approximately the center to one end, and has a plate 27a protruding downward and oppositely along the cut surface. The operating lever 27 formed in this way is placed near the driver's seat and placed on the floor plate 28.
The plate portion 27a is disposed so as to straddle the lock plate 29 fixed above, and is pivotally connected to the lower central portion of the lock plate 29 by a pin 30. That is, the operating lever 27 is disposed substantially horizontally along the floor plate 28 and is attached so as to be tiltable in the vertical direction. Further, the lower end of the plate portion 27a of the operating lever 27 extends downward through the floor plate 28, and a link mechanism 31 disposed below the floor plate 28 extends downwardly.
plunger 23 of said input cylinder 22 via
It is connected to a length-adjustable rod 24 for pushing.

Further, the operating lever 27 is equipped with a locking mechanism for holding the operating lever 27 in the pin removal position. That is, as shown in FIG. 4, a lock pawl 32 is rotatably attached to the operating lever 27 by a pin 33, and is removable from a fan-shaped tooth 29a formed on the outer peripheral surface of the lock plate 29.
This lock claw 32 is always locked to the fan-shaped teeth 29a to prevent movement of the control lever 27 by a lock spring 34, which has one end hooked to the operating lever 27 and the other end hooked to the protrusion 32a of the lock claw 32. .
The release rod 35 inserted into the cylindrical hole of the operating lever 27 has one end connected to the lock pawl 32, and the other end having a button 36 protrudes an appropriate length from the end of the grip 27b of the operating lever 27. By pressing the button 36, the lock pawl 32 can be removed from the sector tooth 29a.

This embodiment is configured as described above,
The effect will be explained below. The attachment and detachment of the bucket 8 to the coupler body 1 shown in FIG. 1 is as described above.
With the upper engaging part 5 and lower engaging part 6 of the coupler body 1 engaged with the hook part 10 and engaging recess 11 of the corresponding bucket bag 8, insert and remove the connecting pin 7 into the pin holes 4a and 9a. It is done by doing. Now, FIG. 3 shows a state in which the connecting pin 7 is inserted, and in this state, the operating lever 27
When the plunger 23 of the input cylinder 22 is pushed upward via the link mechanism 31, the plunger 1 of the output cylinder 17 is pushed through the piping 21.
The rod 19 is pushed by the pressure oil acting on the coupler 8, the link 14 is tilted against the tension spring 16, and the connecting pin 7 is pulled out from the pin holes 4a, 9a of the coupler body 1 and the bucket 8. Ru.

On the other hand, when inserting the connecting pin 7 into the pin holes 4a and 9a, first press the button 3 on the operating lever 27.
By pushing in, the lock pawl 32 is rotated through the release rod 35 against the lock spring 34 and removed from the fan-shaped tooth 29a of the lock plate 29, thereby releasing the lock of the operating lever 27. In this state, if the operating lever 27 is tilted downward, the link mechanism 31
Since the rod 24 of the input cylinder 22 is retracted through the input cylinder 22 and the pressing force on the plunger 18 of the output cylinder 17 is released, the link 14 is tilted by the tension spring 16 and the connecting pin 7 is moved into the pin holes 4a and 9.
inserted into a.

That is, in this embodiment, the connecting pin 7 can be inserted and removed by tilting the operating lever 27, but the locking mechanism of the operating lever 27, which is the operating section, is not limited to the type shown in the drawings. It is possible to change it appropriately as necessary.

As described in detail above, in the present invention, the operating lever for operating the connecting pin is arranged almost parallel to the floorboard, and the upward tilting direction is set as the pin removal/removal operation direction, so that accidental contact can be avoided. Accordingly, there is no risk that the operating lever will tilt in the same direction, and unless an erroneous operation is performed, the insertion state of the connecting pin is ensured, and it is possible to prevent an accidental falling off of the attachment during work. In addition, the operating lever is equipped with a locking mechanism to hold the operating lever in the pin removal position.
There is no need for the operator to hold the operating lever himself, making it easier to attach and detach the coupler. Moreover, since the connecting pin is inserted using a spring, there is no need to apply excessive force to the connecting pin as in conventional hydraulically operated systems, and damage to the pin due to forced insertion or removal can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a bucket belt as an attachment and its attachment/detachment device, Fig. 2 is a front view of the attachment/detachment device, Fig. 3 is an explanatory diagram showing an embodiment of the connecting pin operating device of the present invention, and Fig. 4 5 is a side sectional view showing an operating lever and its locking mechanism, and FIG. 5 is a hydraulic circuit diagram showing an example of a conventional connecting pin operation. 1...Coupler body, 2...Lift arm, 5, 6...
Engagement part, 7... Connection pin, 8... Bucket, 10... Hook part, 11... Engagement recess, 16... Tension spring, 17
...Output cylinder, 22...Input cylinder, 27...Operation lever, 29...Lock plate, 32...Lock claw, 35...Release rod.

Claims (1)

[Scope of utility model registration request] When the engaging part formed in the coupler body provided at the tip of the lift arm is engaged with the engaging part formed in the attachment, the connecting pin provided in the coupler body is connected to the pin hole formed in the coupler body and the attachment. In the attachment/detachment device for a shovel loader, the attachment is connected to the coupler body by inserting the attachment into a pin hole formed in the coupler body, and the coupler body includes a spring that always biases the connecting pin in the direction of inserting it into the pin hole. An output cylinder is provided that resists a spring and acts to remove the connecting pin from the pin hole, and an input cylinder is provided on the vehicle body side that supplies pressure oil to the output cylinder, and a lock that operates the input cylinder is provided. An operating lever with a mechanism is provided so as to be tiltable in the vertical direction, and the operating lever is arranged almost parallel to the floorboard, and the upward tilting direction is set as the pin removal operation direction, and the locking mechanism is a pin operating device for an attachment/detachment device in a shovel loader that is set to lock the operating lever in the pin removal/removal position.