JPH04174136A - Maneuvering and operating structure of back hoe - Google Patents

Abstract

PURPOSE:To remove a malfunction and to improve safety by combining the safety fence of a control seat as the check lever of an engine while integrally installing an auxiliary lever and bringing the engine to a check state when an operator opens the fence when the operator gets on and off. CONSTITUTION:A safety fence installed to the getting-on-off passage R of a back hoe control seat 13 is combined as the check lever 18 of an engine while an auxiliary lever 26 is mounted integrally. When an operator gets off from the seat 13, the auxiliary lever 26 is operated and the check lever (the safety fence) 18 is turned vertically, and the passage R is opened while the engine is checked through a check means A. When the operator gets off during the drive of the engine, a malfunction is prevented even when the operator is brought into contact with a control lever 15a by mistake. Accordingly, the safety can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides a control lever for driving a backhoe device that is disposed in the front side of a pilot's seat, and that the backhoe device is operated regardless of the operation of the control lever. The present invention relates to a control structure for a backhoe equipped with a restraining means for restraining the drive.

[Conventional technology]

In the above operating structure, conventionally, as shown in Japanese Patent Application No. 1-96016 filed by the present applicant, the operating lever has been oriented upwardly toward the front upper part of an operating box disposed in front of the lateral side of the pilot's seat. At the same time, a lever locking device is provided on the lower side of the operation box that can swing freely between blocking the operator's boarding and exit passageway and opening the passageway. There was one that was configured to make it inoperable and check the drive.

[Problem to be solved by the invention]

With the above conventional structure, for example, when the operator gets off the pilot's seat while the engine is running, there is a risk that clothing, etc. may get caught on the control lever of the backhoe device, resulting in a dangerous situation due to unexpected drive movement of the backhoe device or rotation of the swivel base. Therefore, the lever locking device is provided so as to get in the way when getting on and off the vehicle, and by setting the lever locking device in a retired position, the operation lever is prevented from being operated, so that the user forgets to operate the lever lock. There's no such thing, it's just like that.

However, in the above-mentioned conventional structure, when the operator dismounts, he tries to pass through the passage while looking at his feet, so it is necessary to provide the lever locking device in a lower position. When attempting to operate the system, the operator had to reach a distance from the seat, which was a nuisance. Additionally, there was a risk that the user's body would come into contact with the control lever during the operation.

The present invention aims to solve the above-mentioned problems.

[Means to solve the problem]

A characteristic configuration of the present invention is that in the backhoe operation structure described at the beginning, the traction operation lever of the traction means is configured to
An auxiliary lever is provided near the side of the operator's seat that can be freely switched between blocking the passenger's boarding and alighting passage and retiring to open the boarding and alighting passage. The point is that it is arranged so that it protrudes upward.

[Effect]

For example, if the pilot attempts to exit the aircraft while the engine is running, the pilot will inevitably try to operate the traction lever to the retired position, since the entrance/exit path is blocked by the traction lever. At this time, when the auxiliary lever located on the side of the seat is operated, the traction actuation lever moves integrally to set the traction state. Therefore, the pilot can get off the aircraft without worrying about the possibility of contact with the operating lever from the piloting position seated on the seat.

〔Effect of the invention〕

As a result, by simply adding a simple member to the structure, we were able to prevent accidental drive movement of the backhoe equipment due to contact with the backhoe operating lever, which is placed in front of the driver's seat to improve maneuverability. We were able to avoid such risks and improve safety.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 shows a backhoe according to the present invention. This backhoe is equipped with a swivel base (2) mounted on a crawler-type traveling body (1) that can rotate freely around the vertical axis by driving a hydraulic swing motor (M), and a swing bracket on this swivel base (2). A backhoe device (4) is connected to the backhoe device (4) via (3) so as to be freely retractable and swingable around the vertical axis. Further, a control section (5) and a driving section (6) are arranged on the top surface of the swivel table (2). The backhoe device (4) includes a boom (7
), an arm (8), and a packet (9) are pivotally connected so as to be relatively rotatable, and these are driven and oscillated by a boom cylinder (10), an arm cylinder (11), and a packet cylinder (12), respectively. It is configured to carry out excavation work.

The backhoe device (4) is an operation box (14) that also serves as an elbow rest and is installed on both the left and right sides of the pilot seat (13) in the control section (5), and an operation box (14) that protrudes upward from the upper front end of the control box (14). It is configured to be controlled and driven based on the operation of the levers (15a) and (15b).

In other words, as shown in FIG.
5a) and (15b) are first to fourth potentiometers (PMI) which are provided so as to be able to swing crosswise in the front-rear direction and left-right direction, and detect the amount of operation in each operation direction;
(PM2), (PM3), and (PM4), and based on these detection signals, a control device (16) equipped with a microcomputer controls the boom cylinder (10), arm cylinder (II), and packet cylinder ( 12), electromagnetic proportional flow control valves m), (V2), (V3) for hydraulic control of each swing motor (M).

(4) is configured to be controlled and driven.

This backhoe is configured so that when the operator gets on or off the backhoe, he or she gets on or off from the front side of the control section (5) toward the side, and when the operator gets on or off the backhoe while the engine (17) is running , when the body or clothing touches the operating lever (15a);
(15b) is provided with a check means (A) that prevents hydraulic drive from being performed even if it is touched. To be more specific, the checking means (A) is provided in the control device (16) in a program format, and is connected to the control device (16) by bringing the limit switch <SW>-+ into a conductive state. Control valve m), (V2), (V3), (V4)
(7) It is configured to cut off the control signal. The limit switch (SW) is connected to the operation box (14).
As shown in Fig. 1, the tension activation lever (18), which is installed inside the vehicle and turns this limit switch (SW) on and off, is used to block the passenger's boarding passage (R) and to block the boarding and alighting passage (R). It is provided so that it can be freely switched between the open state and the open state. In other words, as shown in Figure 2, the operation box (1
4) The support shaft (21) is internally fitted into the boss portion (20) formed on the bracket (19) fixed to the inner surface of the box, and the traction operating lever (I8) is fixed to the outside of the box of the support shaft (21). A stopper (22) is attached to the inside of the box of the support shaft (21).
) is attached to a contact regulating part (23) which regulates the range of swing, and is provided so that the position can be freely maintained in the above two states by means of a trouble spring (24).

Then, the traction actuating lever (18) or the getting on/off passage (R)
When there is an upper position that blocks the backhoe device (4), the actuating portion (25) of the contact regulating portion (23) turns on the limit switch (SW) and operates, thereby enabling the backhoe device (4) to be driven. When the check lever (18) is in the lower position to open the passage (R), the limit switch (SW) is turned off, the check means (A) is activated, and the drive of the backhoe device (4) is stopped. It becomes impossible.

An auxiliary lever (26), which can be freely swung integrally with the traction lever (18), is disposed near the side of the pilot seat (13) so as to protrude upward.

This auxiliary lever (26) is the traction operating lever (18).
It is integrally connected from the base end of the operation box (14).
It protrudes upward from the top surface.

In this way, the operating levers (15a), (15b)
The control operation can be performed while seated in the pilot seat (13), reducing the risk of operational errors.

[Another example]

As the checking means (A), various means as described below may be used.

(1) Each of the electromagnetic proportional flow control valves m), (V2),
(V3).

An electromagnetic relay may be interposed in the drive circuit of (4), and the relay may be turned off and operated in accordance with the operation of the tension activation lever (18).

(2) The pressure oil in the drive hydraulic circuit of the backhoe device (4) may be drained into the tank in response to the operation of the traction actuation lever (I8).

(3) The engine may be forcibly stopped upon activation of the tension activation lever (18).

Incidentally, although reference numerals are written in the claims section to facilitate comparison with the drawings, the present invention is not limited to the structure of the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the control structure for a backhoe according to the present invention, and FIG. 1 is a side view of the control section, FIG. 2 is a plan view of the main parts, FIG. 3 is a control block diagram, and FIG. 4 is a backhoe control structure. FIG. 5 is a plan view of the control section. (4)... Backhoe equipment, (13)...
...Driver seat, (15a), (15b)...
Operation lever, (18)・old・check lever, (26)・
...Auxiliary lever, (A) Old check means, (R
)... Passageway for boarding and alighting.

Claims (1)

[Claims] A backhoe device (
A restraining means (A) which is provided with drive operation levers (15a) and (15b) of 4) and which checks the drive of the backhoe device (4) regardless of the operation of the operation levers (15a) and (15b). A control operation structure for a backhoe comprising: a traction operation lever (18) of the check means (A);
An auxiliary lever is provided that can be freely switched between a state where the operator's boarding and alighting passage (R) is blocked and a state where the boarding and alighting passage (R) is opened by retiring, and which can be operated integrally with the traction actuating lever (18). (26) A control structure for a backhoe, in which a backhoe is disposed near the side of the control seat (13) so as to protrude upward.