JP2001115496A - Antitheft device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antitheft device for a construction machine which is safe and secure because of independency of human memory, by which it scarcely occurs to forget to operate, and which is not mistaken by other operators. SOLUTION: By inserting a metal fitting of a lock 6 between a locking hole 53a of a locking member 53 protruded at a lower part of a left/right travelling operation lever 51 and a locking hole 54a of a fixed member 54 provided to stand at a front part of a bottom floor 32 for locking, the left/right travelling operation lever 51 is integrated with the bottom floor 32 to set it impossible to be tilted forward or backward, so left/right travelling direction changing valve becomes unchangeable since the left/right travelling operation lever 51 is fixed at a neutral position even when a power switch of a prime mover is closed to start the prime mover, thereby theft of a hydraulic shovel by driving it becomes impossible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft device for construction machines such as hydraulic excavators.

[0002]

2. Description of the Related Art Recently, construction machines such as hydraulic shovels are in high demand in developing countries and are expensive, so that theft cases have become frequent. Therefore, for example, in Japanese Patent Application Laid-Open No. Hei 4-30032, the drive device can be operated by canceling the operation of the start prevention means of the prime mover start system only when a correct password is input to the numeral input device provided on the operation unit. The invention of an anti-theft device for a hydraulic machine which can prevent theft by another person with such a configuration is disclosed. Japanese Unexamined Patent Application Publication No. 9-50584 discloses an unlocking circuit for generating an unlocking signal when a predetermined code is input to the code input means, and a pilot circuit is provided only when the unlocking signal is output from the unlocking circuit. An invention of an anti-theft device for a hydraulic machine that enables a hydraulic circuit system to operate is disclosed.

[0003]

According to the above-mentioned prior art, only a person who knows the correct password can start or operate the hydraulic machine, so that it is convenient and convenient. It is an anti-theft device. However, since the anti-theft device is constituted by an electronic device having a microcomputer or the like, it becomes an expensive separate device, and imposes considerable costs on customers. And
Recently, for example, electronic locking devices such as doors of offices and warehouses have become widespread, and the operator cannot confuse the memorized password with another password and remember it. Sometimes you forget. Further, when the operator stops the operation of the hydraulic machine and gets off the vehicle, the operator sometimes forgets to lock the anti-theft device. In this case, the anti-theft device is in a state where the anti-theft function is actually lost. Also, once the password is known to a third party, the confidentiality is lost.

[0004] Further, the construction machine is often operated by a plurality of operators, in which case when another operator who does not know that the anti-theft device is provided tries to operate the hydraulic machine, If the hydraulic machine does not start or becomes inoperable, it will attempt to inspect or repair the machine. Generally, work sites for operating construction machines are often located in remote places, so in such a case, the operator must move to a place where appropriate information can be obtained and obtain correct operation information. In this case, the progress of the construction work is significantly hindered. The present invention has been made in order to solve such a problem in the prior art, and is safe and reliable because it does not rely on human memory, and is easy to see, so that there is little forgotten operation, and is misidentified by other operators. An object of the present invention is to provide an anti-theft device for construction machinery without fear.

[0005]

According to the present invention, there is provided a locking means for mechanically fixing an operating means or mechanically fixing a switching invalidating means to disable a switching operation thereof. Preferably, the operating means or the switching invalidating means is constituted by an operating rod which is switched by an operator's rotation operation, and the operating rod or the switching invalidating means and the part of the skeleton of the construction machine respectively project. The locking means is constituted by the provided protruding members and a lock connecting the protruding members to each other.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIGS. 1, 2, and 3 are a side view of the anti-theft device for a small hydraulic shovel, a side view of a small hydraulic shovel, and a traveling hydraulic circuit diagram of the small hydraulic shovel according to the first embodiment of the present invention, respectively. In these figures, 2 is a lower traveling body capable of self-propelling, 3 is an upper revolving body pivotally mounted on the lower traveling body 2, and 4 is provided at the front of the upper revolving body 3 so as to be capable of elevating. Working device, 5
Is a driver's seat provided on a central portion of the upper revolving unit 3, 21 is a left and right crawler belt which is wrapped around the lower traveling unit 2 so as to be able to move around the lower traveling unit 2, and 22 is a front of the lower traveling unit 2. Plate provided so as to be able to swing up and down, 23 is a plate 2
A pair of support arms that rotatably support both ends of 2, 31 is a machine room disposed behind the driver's seat 5, 32 is a bottom floor provided with the driver's seat 5, and 33 is an upper part of the driver's seat 5. It is a ceiling plate for awning provided.

Further, regarding the working device 4, 41, 4
Reference numerals 2 and 43 denote booms, arms and buckets which are respectively connected to a rotation fulcrum provided at a front portion of the upper revolving unit 3 so as to be rotatable, and 44, 45 and 46 denote these booms 41, arms 42 and buckets 43. Cylinders, arm cylinders, bucket cylinders, and operation units, each of which rotates and drives the lower traveling body 2
A travel control rod 52 for performing left and right travel motion operations
Is a work control rod for operating each work element of the work device 4, 53 is a locking piece protruding below the travel control rod 51, and 54 is a member in front of the bottom floor 32 of the driver's seat 5. The fixing pieces 53a and 54a are provided at positions corresponding to the locking pieces 53 and 54a, respectively. This is a lock for penetrating and locking the locking holes 53a, 54a of the fixing piece 54.

Further, regarding the traveling system hydraulic circuit,
Reference numerals 8 and 9 denote hydraulic pumps for supplying hydraulic oil to actuators for driving the small hydraulic excavator, an oil tank for storing hydraulic oil, and a pilot hydraulic source for supplying pilot hydraulic pressure, respectively. ,
Left and right traveling direction switching valves for switching the outflow direction of the discharge oil from the hydraulic pump 7 according to the operation of b), and 73 and 74 are left and right traveling motors. Locking piece 53 and fixing piece 5
Reference numeral 4 is firmly fixed to the traveling operation rod 51 and the bottom floor 32 by welding or the like. It should be noted that although there is naturally a hydraulic circuit indicating a supply path of hydraulic oil to the boom cylinder 44 and the like for driving the working device 4 and the like, the operation is the same as that of the conventional example and the operation is not changed. Omitted.

FIG. 1 shows a state in which the small hydraulic shovel is locked when not in operation. When the small excavator is in operation, the lock 6 is removed from the locking holes 53a and 54a of the locking piece 53 and the fixing piece 54 as a matter of course. . At this time, the left and right traveling operation rods 51 (a, b) can be freely tilted in the front-rear direction by the operation of the operator as in the conventional case. 51 (a, b) is operated to switch the left and right traveling direction switching valves 71, 72, and the left and right traveling motors 7 are operated.
Adjust the rotation direction and rotation speed of 3,74. In response to this, the circling direction and circling speed of the left and right crawler belts 21 change, so that the lower traveling body 2 that travels by circling the left and right crawler belts 21, and thus the small excavator, moves at a desired speed in a desired direction Drive on.

When a predetermined operation by the small hydraulic excavator is completed, the operator operates the traveling operation rod 51 and the operation operation rod 52.
After returning to the neutral position, the power switch of the prime mover (not shown) is turned off. As a result, the prime mover stops, and the small excavator stops operating. Therefore, the operator stands on the front of the bottom floor 32 at a position facing the locking hole 53a of the locking piece 53 projecting below the left and right traveling operation rods 51 (a, b). The metal fitting of the lock 6 is inserted between the fixing piece 54 and the locking hole 54a of the fixing piece 54 to lock. As a result, the left and right traveling operation rods 51 (a, b) are integrated with the bottom floor 32 and cannot be tilted in the front-rear direction. For example, the power switch of the prime mover is closed by some means and the prime mover is started. Even if it does, since the left and right traveling operation rods 51 (a, b) are fixed at the neutral position and cannot be operated, the small excavator cannot travel and steal without permission.

The locking pieces 53 of the traveling operation rods 51 (a, b) and the fixing pieces 54 erected on the bottom floor 32 are firmly fixed by welding or the like as described above, and ordinary means are used. Since this embodiment cannot be separated, the present embodiment has an excellent security function. If the key of the lock 6 and the key of the power switch are held together, it is possible to prevent the lock of the lock 6 from being forgotten or the lock 6 to be forgotten. In the present embodiment, both the left and right traveling operation rods 51 (a, b) are fixed to the bottom floor 32 by the locking pieces 53 and the fixing pieces 54 to disable the operation. The same purpose can be achieved even if only one of them is fixed to the bottom floor 32.

As described above, in this embodiment, the traveling operation rod 51 is used.
By disabling (a, b) in the neutral position, the small hydraulic excavator is prevented from being stolen.
The operation may be disabled at another operation position. Further, the left and right traveling direction switching valves 71 and 72 are switched by the pilot oil pressure supplied from the pilot oil pressure source. However, the manual operation can be directly switched by a mechanical power transmission mechanism. Alternatively, the switching operation may be performed via an electromagnetic switching operation mechanism. Further, in certain types of construction machines, the operation rods other than the traveling operation rod are made inoperable, thereby preventing theft.

FIGS. 4, 5 and 6 are a side view of the anti-theft device for a small hydraulic shovel according to a second embodiment of the present invention, a side view of the small hydraulic shovel and a hydraulic circuit diagram of the traveling system of the small hydraulic shovel. It is. In these figures,
54 is caused when the operation of the small hydraulic excavator is stopped, so that the switching positions of all the directional control valves are held at the neutral position regardless of the operation positions of the other operation rods, that is, the other operation rods Pausing operation rods 55 and 56 for interrupting the supply of the pilot pressure, locking members 55 and 56 are locking pieces and fixing pieces which are firmly fixed to the pedestal of the driver's seat 5 by welding or the like, respectively. This is an on-off valve that opens and closes in conjunction with operation. Parts that are the same as or deemed to be the same as in the first embodiment are given the same reference numerals, and redundant descriptions thereof are omitted. Note that a hydraulic circuit for supplying pilot pressure to the pilot valve of the work operation rod 52 is actually provided downstream of the on-off valve 75, but is omitted here.

When the operator gets on the small excavator and sits on the driver's seat 5, the rest operation rod 54 is pushed down, whereby the on-off valve 75 is opened and the traveling operation rod 51 is opened.
The pilot pressure is supplied to the pilot valves (a, b), and the tip of the work operation rod 52 protrudes into the operator's entry / exit passage to prevent the operator from passing. It should be noted that the pilot pressure is simultaneously supplied to the pilot valve of the work operation rod 52 by the opening of the on-off valve 75, so that an operation for performing a predetermined work becomes possible. When all the work is completed,
After turning off the power switch, the operator raises the stop operation rod 54, closes the on-off valve 75, and moves the operation control rod 51.
The pilot oil passage communicating with the pilot valve (a, b) is shut off, and the getting-off passage is opened to get off the vehicle.

Therefore, in this embodiment, the lock 6 is inserted through the respective locking holes of the locking piece 55 of the rest operation rod 54 and the fixing piece 55 fixed to the base of the driver's seat 5 when the work is stopped. And the operation rod 51 (a, b) is operated to switch the left and right traveling direction switching valves 71 and 72 by operating the traveling operation rod 51 (a, b) even if the prime mover moves. This prevents the small excavator from running. In this embodiment, since the rest operation rod 54 is rotatably attached to the pedestal portion of the driver's seat 5, the operation of attaching and detaching the lock 6 can be easily performed.

[0016]

As described above, according to the first or second aspect of the present invention, the operating means is mechanically fixed or the switching invalidating means is mechanically fixed to disable the switching operation. Since the locking means is provided, it is possible to prevent theft safely and reliably because it does not rely on human memory, and it is easy to see, so that there is little forgotten operation, and there is no risk of being mistakenly recognized by other operators. it can.

[Brief description of the drawings]

FIG. 1 is a side view of a small hydraulic shovel anti-theft device according to a first embodiment of the present invention.

FIG. 2 is a side view of the small excavator.

FIG. 3 is a traveling hydraulic circuit diagram of the small hydraulic excavator.

FIG. 4 is a side view of a small hydraulic shovel anti-theft device according to a second embodiment of the present invention;

FIG. 5 is a side view of the small excavator.

FIG. 6 is a traveling hydraulic circuit diagram of the small excavator.

[Explanation of symbols]

 2 Lower traveling body 3 Upper revolving superstructure 4 Working device 5 Driver's seat 6 Lock 21 Crawler belt 31 Machine room 32 Bottom floor 41 Boom 42 Arm 43 Bucket 51 (a, b) Traveling operation rod 52 Work operation rod 53, 55 Locking piece 54 , 56 Fixing pieces 53a, 54a Lock holes 71, 72 Traveling direction switching valves 73, 74 Traveling motor 75 On-off valve

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Toshiaki Shimomura 650, Kandamachi, Tsuchiura-shi, Ibaraki F-term in the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. (Reference) 2D015 GA01 GB00

Claims (3)

[Claims] 1. A hydraulic pump driven by a prime mover,
An actuator including a travel motor driven by hydraulic oil discharged from the hydraulic pump, and an actuator interposed in an oil pipeline connecting the hydraulic pump and the travel motor;
In a construction machine anti-theft device comprising a traveling direction switching valve for switching the direction of hydraulic oil and an operating means for switching the traveling direction switching valve, the operating means is mechanically fixed. An anti-theft device for a construction machine, comprising locking means for disabling a switching operation. 2. A hydraulic pump driven by a prime mover,
An actuator including a travel motor driven by hydraulic oil discharged from the hydraulic pump, and an oil pipe line interposed between the hydraulic pump and the actuator including the travel motor, for traveling to switch the direction of hydraulic oil. Direction switching valve including a direction switching valve for use, operating means for switching the direction switching valve, and disabling a switching operation of the direction switching valve including at least the traveling direction switching valve by operation of the operation means. A construction machine anti-theft device, comprising: a lock-disabling device that mechanically fixes the switch-disabling device and disables its switching operation. . 3. The operating means or the switching invalidating means is constituted by an operating rod which is switched by an operator's turning operation, and the locking means is respectively provided on the operating means or the switching invalidating means and a part of the frame of the construction machine. 3. The anti-theft device for a construction machine according to claim 1, wherein the anti-theft device for a construction machine comprises a protruding protruding member and a lock connecting the protruding members to each other.