JPS646006Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a hydraulic lever lock device for a mobile agricultural machine.

Hydraulic lever lock devices for mobile agricultural machinery such as combine harvesters and agricultural tractors were originally designed to allow one person to fix the working equipment in a raised position during adjustment and maintenance of the working equipment, such as the reaping section or rotary tiller. If a worker is stuck below the machine, another worker or a third party may carelessly operate the hydraulic lever without checking for safety, or may accidentally touch the hydraulic lever, causing damage to the reaping section. This is to prevent work equipment such as rotary tillers and rotary tillers from descending suddenly.

And, as a conventional locking device of this kind, for example,
As shown in Fig. 5, a structure is provided in which a hinge-type stopper is fixed to the top surface of the panel, and the lever is removably engaged with a hydraulic lever for raising and lowering a working machine such as a reaping part or a rotary tiller. However, with such a structure, the lock can be easily released by simply pulling up the stopper by hand, which not only poses a safety problem, but also has a structure that allows the engine to be started freely regardless of whether the lock is locked or not. for,
One worker enters the lower part of the machine and adjusts the work equipment.
During maintenance, etc., other workers or third parties sometimes accidentally start the engine without checking that the hydraulic lever is locked or released, which can cause the transmission parts of the aircraft to malfunction. There was a risk of serious injury or death due to sudden rotation or the aircraft taking off unexpectedly, and although it functioned as a safety device, there was an inherent danger from incorrect operation.

The present invention was designed to solve the above-mentioned safety problems, and is designed so that locking and unlocking of the hydraulic lever can be performed using the engine starting key, making it easy to operate. An object of the present invention is to provide a hydraulic lever lock device for a mobile agricultural machine, which can prevent erroneous operation as much as possible and significantly improve safety despite its simple structure.

To explain the structure of the present invention with reference to an embodiment shown in the drawings, FIG. It is equipped with left and right sand clutch levers 3, 3, grip stays 4, 4, an engine start switch 5, and various other switches and instruments (not shown). are the operating levers 7, 8, 9, 10, 11, 12 that operate each part of the aircraft.
are equipped with each. 13 is a reaping section, 14 is a threshing section, and 15 is an engine cover.

By the way, among the above-mentioned operation levers 7 to 12, 8
1 is a hydraulic lever for raising and lowering the reaping section 13, and by tilting this hydraulic lever 8 in the direction of the arrow, the reaping section 13 can be automatically raised and lowered.
Reference numeral 16 denotes a lock plate for the hydraulic lever 8, which is attached to the back side of the side panel 6 via the fulcrum shaft 17.
It is rotatable around the center and along the side panel 6, and a hydraulic lever 8 is attached to the tip of the rotation.
A locking groove 16a is provided to removably engage with the
Hydraulic lever 8 is controlled by these lock plates 16 etc.
A locking device B is formed.

FIG. 2 is an exploded perspective view showing the mounting structure of the locking device B. As shown in the figure, a pivot hole 18 is provided in the side panel 6, located on the central front extension of the guide slot 8' of the hydraulic lever 8. Insert the fulcrum shaft 17 from above into the pivot hole 18, and insert the washer 19, lock plate 16, washer 20, and spring washer 21 in this order from the back side of the side panel 6, and tighten the fulcrum shaft with the nuts 22, 22. The shaft 17 is tightened and fixed with an appropriate strength to the extent that it cannot be rotated even if the shaft 17 is turned by hand.

The head 17' of the fulcrum shaft 17 (the part that protrudes above the side panel 6) is formed into a conical shape with a truncated cone, so that it cannot be rotated by hand, and on its top surface there is a key for starting the engine. A key hole 23 into which the key 5a can be inserted and removed is provided.

Further, the neck 17'' of the fulcrum shaft 17 and the hole 16' of the lock plate 16 into which the neck 17'' fits are each formed into a two-beveled shape as shown in the figure.
The lock plate 16 and the lock plate 16 can be rotated together.

Note that the fulcrum shaft 17 is, for example, as shown in FIG.
The head 17' and neck 17'' are integrally molded from synthetic resin, and a separate threaded portion 17 is attached to the neck 17''.
It may be inserted and fixed in place.

In the figure, reference numeral 24 denotes a stopper for regulating the rotation range of the lock plate 16, which is fixed to the back surface of the side panel 6.

In the configuration as described above, the maintenance and maintenance of the reaping section 13
When locking the hydraulic lever 8 in the raised position during adjustment, etc., press key 5 of the engine start switch 5.
When a is removed and inserted into the key hole 23 of the fulcrum shaft 17 and rotated clockwise in FIG. 3, the lock plate 16 rotates integrally with the fulcrum shaft 17 from the position shown by the phantom line to the position shown by the solid line Then, the hydraulic lever 8 enters the tip locking groove 16a, and thereby the hydraulic lever 8 is reliably locked. To release the lock, turn the key 5a counterclockwise to release the lock plate 1.
Reference numeral 6 indicates that the lock is released by turning from the locked state shown by the solid line to the state shown by the phantom line.
It is also possible to adopt a structure in which the key 5a does not come out from the key hole 23 of the fulcrum shaft 17 when the hydraulic lever 8 is locked.

In this way, the present invention locks and unlocks the hydraulic operating lever 8 using the key 5a of the engine start switch 5.
3, during maintenance etc., the key 5a cannot be removed from the engine start switch 5 while the engine is running, and therefore the locking operation of the hydraulic lever 8 must be performed after the engine is stopped. Therefore, it is possible to reliably prevent the dangerous situation of crawling downwards with the engine running, unlike in conventional systems.

Furthermore, even if someone accidentally tries to start the engine while the operator is performing maintenance work below the aircraft by locking the hydraulic lever 8, the key 5a for starting the engine is not activated by the start switch 5. It is not inserted into the fulcrum shaft 17 of the hydraulic lever lock device B.
Since it remains inserted into the key hole 23 of the machine, you can always check whether the hydraulic lever 8 is in the locked state, and if it is in the locked state, it will notify you that someone is below the aircraft. Therefore, it is possible to alert a third party and prevent danger due to erroneous operation.

Furthermore, a lock plate 16 for fixing the hydraulic lever 8 is attached to the back side of the side panel 6.
Moreover, the head 17' of the fulcrum shaft 17 is formed into a truncated conical shape, which, together with the proper tightening force of the bolts 22, 22, prevents it from being easily turned by hand. There is no inconvenience of manually unlocking the device, and it is extremely safe, and since the lock plate 16 is not exposed on the side panel 6, there is no need to worry about unsightly appearance.

As described above, the present invention provides a mobile agricultural machine equipped with a locking device for locking the hydraulic lever for lifting and lowering the working machine in a predetermined position. A lock plate having a locking groove is rotatably attached to a fulcrum shaft integrally provided on the lock plate and along the panel, and a key for starting the engine is mounted on an upper protrusion of the fulcrum shaft. A key hole is provided in which the key is inserted into and removed from the engine, and a key for starting the engine is inserted into the key hole and rotated to lock or unlock the hydraulic lever, so the structure is simple and can be manufactured at low cost. However, it eliminates the possibility of elementary mistakes such as adjusting or servicing the work equipment with the engine running, and it also eliminates the possibility of someone else inadvertently damaging the engine when the hydraulic lever is locked. It is possible to prevent the extremely dangerous erroneous operation of starting the
This has the effect of significantly increasing safety during adjustment and maintenance of work equipment.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing the structure around the driver's seat of a combine harvester equipped with the present invention, Fig. 2 is an exploded perspective view of the main parts, Fig. 3 is an explanatory diagram of the operation of the main parts, and Fig. 4
The figure is a longitudinal sectional side view of the fulcrum shaft, and FIG. 5 is a partially cutaway perspective view of a conventional example. In the figure, 5a is a key for starting the engine, 6 is a panel, 8 is a hydraulic lever, 13 is a reaping part, 16 is a lock plate, 16a is a locking groove, 17 is a fulcrum shaft, 2
3 is the key hole.

Claims (1)

[Scope of utility model registration request] In a mobile agricultural machine equipped with a locking device for locking a hydraulic lever for lifting and lowering a working machine in a predetermined position, a locking plate having a locking groove for the hydraulic lever is provided on the back side of the panel from which the hydraulic lever protrudes. The lock plate is rotatably mounted around a fulcrum shaft provided integrally with the lock plate and along the panel, and a key hole into which a key for starting the engine is removably inserted into the upper protrusion of the fulcrum shaft. 1. A hydraulic lever locking device for a mobile agricultural machine, characterized in that a key for starting the engine is inserted into the keyhole and rotated to lock or unlock the hydraulic lever.