JP4223451B2 - Anti-theft device for construction machinery - Google Patents

Description

  The present invention relates to an antitheft device for a construction machine including, for example, a hydraulic excavator, and more particularly to an antitheft device for a construction machine provided with a plurality of input switches for inputting a personal identification number for releasing the locked state of the construction machine. .

  Various technologies have been proposed for anti-theft devices for construction machines, and as an example, a numeric keypad for entering a code number when starting a construction machine and a code number in which the entered code number is stored in advance. A canceling electronic device that determines whether or not they coincide with each other, a starter control relay that is driven according to a signal from the canceling electronic device, a key switch start relay that is driven according to the operation of the key switch, the starter control relay, A configuration including an engine starter connected to a power source (battery) via a key switch start relay or the like has been proposed (see, for example, Patent Document 1). In this prior art, the contact of the starter control relay is closed by a signal from the release electronic device only when the password entered with the numeric keypad matches the password stored in advance, and then the key switch is operated by operating the key switch. By closing the contact of the start relay, the starter is energized and the engine is started. On the other hand, when the passwords do not match, the contact of the starter control relay is opened and the engine is disabled (locked) to prevent theft.

Japanese Patent No. 3233573

However, there are the following problems in the above-described prior art.
That is, in the above-described prior art, the password is entered using the numeric keypad every time the construction machine is to be unlocked. And it is troublesome for the operator to change the password every time, and the password is often fixed. For this reason, a limited numeric keypad for inputting a personal identification number may deteriorate, become dirty, or lose color depending on the frequency of use. In such a case, it becomes obvious at a glance that the degraded numeric keypad constitutes a personal identification number, which gives a third party a clue of the personal identification number and may be stolen.

  An object of the present invention is to provide a theft prevention device for a construction machine that can reliably prevent theft without giving a clue to a personal identification number to a third party.

( 1 ) In order to achieve the above object, the present invention provides a plurality of input switches for inputting a personal identification number, and a determination for determining whether the personal identification number input by these input switches matches a personal identification number stored in advance. And an antitheft device for a construction machine comprising a release means for releasing the locked state of the construction machine when it is determined by the determination means that the passwords match, provided on the plurality of input switches, Each of the plurality of input switches includes a decorative name plate on which a code number character is written and a protective name plate on which the code number character is written and can be attached to the decorative name plate.

( 2 ) In the above (1 ) , preferably, a tag portion is provided on the protective nameplate.

  According to the present invention, it is possible to reliably prevent theft without giving a third party a clue about a personal identification number.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view illustrating the entire structure of a small hydraulic excavator to which the construction machine antitheft device according to the present embodiment is applied, and FIG. 2 is a top view illustrating the entire structure of the small hydraulic excavator. 3 is a perspective view showing the detailed structure of the interior of the cab of the excavator. Hereinafter, when the operator is seated in the driver's seat with the excavator shown in FIG. 1, the front side (right side in FIG. 1), rear side (left side in FIG. 1), left side (paper surface in FIG. 1). The back side and the right side (front side toward the paper surface in FIG. 1) are simply referred to as the front side, the rear side, the left side, and the right side.

  1 to 3, the excavator is mounted on a lower traveling body 2 having left and right endless track tracks (crawlers) 1 </ b> L and 1 </ b> R as traveling means, and is pivotably mounted on the upper portion of the lower traveling body 2. An upper revolving body 3, a swing post 5 attached to a revolving frame 4 forming a basic lower structure of the upper revolving body 3 so as to be rotatable in a horizontal direction around a vertical pin (not shown), A multi-joint type front working machine 6 attached to the swing post 5 so as to be pivotable in the vertical direction (so that it can be lifted and lowered), a so-called canopy type cab 7 provided on the revolving frame 4, and the revolving frame 4 And an upper cover 8 that covers most of the area other than the operator's cab 7.

  The lower traveling body 2 includes a substantially H-shaped track frame 9 and drive wheels 10L and 10R rotatably supported near the rear ends of the left and right sides of the track frame 9 (only 10L is shown in FIG. 1). Left and right traveling hydraulic motors 11L and 11R (only 11L shown in FIG. 1) for driving the drive wheels 10L and 10R, respectively, and rotatably supported in the vicinity of the left and right front ends of the track frame 9, Driven wheels (idlers) 12L and 12R (only 12L shown in FIG. 1) that are rotated by the driving force of the drive wheels 10L and 10R through the crawler belts 1L and 1R, respectively, are provided on the front side of the track frame 9 so as to be vertically movable And a blade 14 for earth removal that moves up and down by a hydraulic cylinder 13 for the blade. Further, a swivel bearing (swivel wheel) 15 is disposed at the center of the lower traveling body 2, and a swing hydraulic motor (not shown) is disposed in the vicinity of the center of the swirling wheel 15 to rotate the swing frame 4 relative to the lower traveling body 2. Z) is built-in.

  The swing post 5 can be horizontally rotated with respect to the revolving frame 4 via a vertical pin (not shown). The swing post 5 is connected to a swing hydraulic cylinder 16 provided on the revolving frame 4 via a connecting pin (not shown). The front work machine 6 swings to the left and right by rotating around the center of the axis.

  The front work machine 6 includes a boom 17, an arm 18 that is rotatably connected to the boom 17, and a bucket 19 that is rotatably connected to the arm 18. The boom 17, the arm 18, and the bucket 19 are operated by a boom hydraulic cylinder 20, an arm hydraulic cylinder 21, and a bucket hydraulic cylinder 22, respectively.

  The driver's cab 7 is provided on the left side of the revolving frame 4 described above, and a seat (driver's seat) 23 on which an operator sits, a roof 24 provided above the seat 23, and the roof 24 are supported. And a support column 25 to be used.

  On the front side of the seat 23 (lower left side in FIG. 3), the left and right traveling hydraulic motors 11L and 11R are respectively driven, and the left and right can be operated with both hands and feet for moving the hydraulic excavator forward or backward. Operation levers 26L and 26R for right travel are provided. An optional operation pedal 27L for driving an optional hydraulic actuator (for example, a breaker hydraulic motor) is provided on the left side (lower right side in FIG. 3) of the left travel operation lever 26L. On the further right foot (upper left side in FIG. 3) of the right traveling operation lever 26R, the swing hydraulic cylinder 16 is driven to swing the swing post 5 (in other words, the entire front work machine 6) to the left and right. A swing operation pedal 27R is provided.

  On the left side of the seat 23, the swing hydraulic motor is driven by operating the left or right side to rotate the upper swing body 3 to the left or right side, and the arm hydraulic cylinder 21 is operated by operating the front or rear side. A cross operation type left manual operation lever 28L for driving and dumping or crowding the arm 18 is provided. A lock lever 30 for preventing an erroneous operation is provided below the left manual operation lever 28L, which can shut off the original pressure from a hydraulic source such as a pilot pump 29 (see FIG. 4 described later).

  On the right side of the seat 23, the bucket hydraulic cylinder 22 is driven by operating the left or right side to cause the bucket 19 to be clouded or dumped, and the boom hydraulic cylinder 20 is driven to operate the front or rear side to operate the boom 17. A cross operation type right manual operation lever 28R that lowers or raises and a console having a key switch 31, a key input device 32, and the like are provided.

  The upper cover 8 includes an engine 33 (see FIG. 4 described later), a hydraulic pump 34 driven by the engine 33 (see FIG. 4 described later), and a hydraulic oil tank serving as a pressure oil source for the hydraulic pump 34. A device such as 35 (see FIG. 4 described later) is accommodated.

  In the configuration described above, the left / right endless track crawler tracks 1L and 1R, the upper swing body 3, the swing post 5, the blade 14, the boom 17, the arm 18, and the bucket 19 are provided by a hydraulic drive device provided in the hydraulic excavator. A driven member to be driven is configured.

  FIG. 4 is a circuit diagram showing the antitheft device for the construction machine according to the present embodiment, taking as an example the configuration of the main part related to the boom 17 in the hydraulic drive device.

  In FIG. 4, the engine (prime mover) 33, the variable displacement hydraulic pump 34 driven by the engine 33, the fixed displacement pilot pump 29 driven by the engine 33, and the pumps, for example. The hydraulic oil tank 35 serving as the pressure oil source 34, 29, the boom hydraulic cylinder 20 driven by the pressure oil discharged from the hydraulic pump 34, and the pressure oil from the hydraulic pump 34 to the boom hydraulic cylinder 20 A hydraulic pilot type boom control valve 36 for controlling the flow, an operation lever device 37 having the right manual operation lever 28R for instructing the operation of the boom 17 and the like, and a lock lever device 38 having the lock lever 30; And a lock valve 39 that can cut off the original pressure from the pilot pump 29 is provided.Furthermore, the key switch 31 for instructing ON / OFF of the engine 33 and the power source, the engine starting circuit 40 for starting the engine 33 by the operation of the key switch 31, the key input device 32 capable of inputting a personal identification number, etc. A controller 41 is provided.

  The lock valve 39 is provided in a hydraulic line between the pilot pump 29 and the operating lever device (the operating lever device 37 in FIG. 4), and allows the hydraulic line to be connected and disconnected by operating the lock lever 30. is there. That is, when the lock lever 30 is pulled down to the lowered position (down state), the contact of the lock lever device 38 is closed and the contact of the pilot control relay 42 is normally closed. Is input to the solenoid driving portion 39a of the lock valve 39, and the lock valve 39 is switched to the communication position shown on the left side in FIG. As a result, the original pressure (primary pilot pressure) from the pilot pump 29 is guided to the operation lever device 37 and the like. On the other hand, when the lock lever 30 is pulled up to the raised position (the raised state), the contact of the lock lever device 38 is opened, and the lock valve 39 is switched to the cutoff position shown on the right side in FIG. The primary pilot pressure is cut off.

  The operation lever device 37 includes the right manual operation lever 27L and a pair of pressure reducing valves 37a for outputting an operation pilot pressure (secondary pilot pressure) obtained by reducing the primary pilot pressure from the pilot pump 29 according to the operation amount. 37b. Then, when the operation lever 28R of the operation lever device 37 is operated to the arrow A side in FIG. 4 (or the opposite side, the same correspondence relationship in parentheses hereinafter), the pressure reducing valve 37a (or pressure reducing valve 37b) is operated according to the operation amount. The generated operation pilot pressure is output to the pilot operation part 36a (or 36b) of the boom control valve 36, and the control valve 36 is switched by this.

  The engine start circuit 40 is connected to the starter 43 for starting the engine 33 with, for example, an electric motor, the starter control relay 45 connected to the starter 43 via a wire 44a, and connected to the starter control relay 45 via a wire 44b. The key switch start relay 46 and a power source (battery) 47 connected to the key switch start relay 46 via a wiring 44c.

  The key switch 31 is rotated by inserting, for example, an operation key held by an operator into a key cylinder or the like. As a result, when the key switch 31 is operated to the OFF position, for example, the electric system is turned off and the engine 33 is stopped. When the key switch 31 is operated to the ON position, for example, the electric system is turned ON. ing. Further, when the key switch 31 is operated to the start position, for example, the operation signal is output to the key switch start relay 46, the contact of the key switch start relay 46 is closed, and the contact of the starter control relay 45 is normally closed. Since it is in a state, the starter 43 is supplied with power from the battery 47 via the wirings 44 a, 44 b, 44 c and the like, and starts the engine 33.

  The key input device 32 includes a ten key 48 for inputting a personal identification number from 0 to 9, a setting key (function key) 49 for instructing setting and changing of the personal identification number, and a cancellation key for instructing cancellation of the input personal identification number ( A clear key) 50, a lock indicator lamp 51 for displaying a locked state (details will be described later) of the excavator, and an unlocking indicator lamp 52 for displaying the release of the locked state of the excavator.

  The controller 41 performs predetermined arithmetic processing on signals from the key switch 31 and the key input device 32, and outputs the generated control signals to the key input device 32, the starter control relay 45, and the pilot control relay 42, respectively. It has become. That is, for example, when the key switch 31 is operated to the OFF position, the controller 41 outputs a control signal to the key input device 32, blinks the lock indicator lamp 51 of the key input device 32, and turns off the unlock indicator lamp 52. . Then, a control signal is output to the starter control relay 45 so that the contact of the starter control relay 45 is opened, and the engine 33 cannot be started by the operation of the key switch 31 described above. In addition, a control signal is output to the pilot control relay 42 so that the contact of the pilot control relay 42 is opened, and switching to the communication state of the lock valve 39 by the operation of the lock lever 30 described above is disabled. Is cut off so that the hydraulic actuator (the boom hydraulic cylinder 20 or the like) cannot be operated.

  On the other hand, for example, when the key switch 31 is operated to the ON position and a password is input with the numeric keypad 48 of the key input device 32, the controller 41 matches the input password with the password stored in advance. When the passwords match, a control signal is output to the key input device 32, the lock indicator lamp 51 of the key input device 32 is turned off, and the unlock indicator lamp 52 is turned on. Then, a control signal is output to the starter control relay 45 to close the contact of the starter control relay 45 so that the engine 33 can be started by operating the key switch 31. Also, a control signal is output to the pilot control relay 42 to close the contact point of the pilot control relay 42, and the lock valve 39 can be switched to the communication state by operating the lock lever 30, and the primary pilot pressure is operated. The hydraulic actuator is made operable by being introduced into the lever device 37 or the like.

  Next, the detailed structure of the key input device 32, which is a major feature of the present embodiment, will be described. 5 is a top view showing the overall structure of the key input device 32, and FIG. 6 is a longitudinal sectional view taken along section VI-VI in FIG.

  5 and 6, the key input device 32 includes a main body case 53, a board 54 disposed in the main body case 53, the lock indicator lamp (LED) 51 mounted on the board 54, and an open state. A lock indicator lamp (LED) 52, a plurality of switches (tactile switches) 55 mounted on the substrate 54 and constituting the ten key 48, the setting key 49, and the cancel key 50, respectively, and in the vicinity of the plurality of switches 55, respectively. A plurality of mounted illumination lamps (LEDs) 56, a waterproof film 57 made of, for example, rubber that covers the entire board 54, and an adhesive or the like are provided on the upper surface side of the main body case 53. 0 to 9), “F” character of the setting key 49, “C” character of the cancel key 50, and the like, and affixed to the decorative name plate 58, for example And a protection nameplate 59 of the color transparent.

  On the upper surface side of the main body case 53, a plurality of through holes (not shown) formed corresponding to the locking indicator lamp 51 and the unlocking indicator lamp 52, a ten key 48, a setting key 49, and a cancel key 50 are provided. There are provided a plurality of through holes 53a formed corresponding to each other. The waterproof film 57 is formed such that portions corresponding to the through holes 53a of the main body case 53 protrude upward, and a plurality of switch contacts protruding downward so as to be close to the switches 55 on the substrate 54, respectively. A portion 57a is provided. For example, when the operator presses any of the numeric keypad 48, the setting key 49, and the cancel key 50, the protective nameplate 59, the decorative nameplate 58, and the switch contact portion 57a of the waterproof film 57 are connected to the substrate 54. The switch 55 is operated and input. In the key input device 32 having such a structure, the waterproofness of the substrate 54 is enhanced by the protective nameplate 59, the decorative nameplate 58, and the waterproof film 57. That is, since the key input device 32 is disposed in the canopy type cab 7, there is a high possibility that the key input device 32 is exposed to wind and rain, and it is important to improve waterproofness.

  The decorative name plate 58 is formed so that the light of the lock indicating lamp 51 and the unlocking display lamp 52 is transmitted, and for example, the character portion described on the decorative name plate 58 is formed so that the light of the illumination lamp 56 is transmitted. (The waterproof film 57 and the protective nameplate 59 also transmit light). The plurality of illumination lamps 56 are turned on in response to a control signal from the controller 41 until, for example, the key switch 31 is operated to the ON position and the above-described locked state is released.

  The protective nameplate 59 has substantially the same size as the decorative nameplate 58 and is provided with, for example, two tag portions 59 a so as to slightly protrude from the main body case 53. The protective name plate 59 is usually attached to the decorative name plate 58 with an adhesive force that is not easily peeled off. For example, the operator holds the tag portion 59a and pulls it upward. Note that the protective nameplate 59 attached to the decorative nameplate 58 is not limited to one. For example, the protective nameplate 59 may be divided and attached, or a plurality of protective nameplates 59 may be overlaid. In addition, when the protective nameplate 59 is piled up, you may provide so that the position of the tag part 58a may shift | deviate.

  In the above, the numeric keypad 48 constitutes a plurality of input switches for inputting the personal identification number described in the claims, and the controller 41 determines whether or not the personal identification number input by the input switch matches the personal identification number stored in advance. And a release means for releasing the locked state of the construction machine when the determination means determines that the passwords match.

Next, the operation and effect of this embodiment will be described.
For example, when the operator finishes or cancels the work by the hydraulic excavator, the key switch 31 is operated to be turned off, the electric system is turned off, and the engine 33 is stopped. Then, the controller 41 outputs a control signal, blinks the lock indicator lamp 51 of the key input device 32, turns off the unlock indicator lamp 52, opens the contact of the starter control relay 45, and opens the pilot control relay. The contact of 42 is opened, the engine 33 cannot be started, the hydraulic actuator cannot be operated, and the hydraulic excavator is set to the locked state. As a result, the excavator can be prevented from being stolen. Thereafter, when the operator resumes the work with the hydraulic excavator, for example, the key switch 31 is operated to the ON position to turn on the electrical system, and the password is input with the numeric keypad 48 of the key input device 32. Then, the controller 41 outputs a control signal, turns off the lock indicator lamp 51 of the key input device 32, turns on the unlock indicator lamp 52, closes the contact of the starter control relay 45, and the pilot control relay 42. Are closed, the engine 33 can be started, the hydraulic actuator can be operated, and the locked state of the excavator is released. As a result, the operator can operate the key switch 31 to the start position to start the engine 33 and operate the hydraulic actuator.

  However, the limited numeric keypad 48 for inputting a personal identification number may be deteriorated, soiled, discolored, etc. depending on the frequency of use. In such a case, a clue to the personal identification number is given to a third party. . Therefore, in the present embodiment, a colorless and transparent protective name plate 59 is pasted in advance on a decorative name plate 58 provided on the numeric keypad 48 and printed with a code number character (0 to 9) or the like. Thus, for example, when the protective nameplate 59 is deteriorated, soiled, or discolored due to the frequency of use of the numeric keypad 48, the protective nameplate 59 can be removed to clean the top of the numeric keypad 48. Therefore, it is possible to reliably prevent theft without giving a clue to the secret code number to a third party.

  In the above embodiment, the case where the colorless and transparent protective nameplate 59 is pasted on the decorative nameplate 58 in advance has been described as an example, but the present invention is not limited thereto. That is, for example, a protective nameplate on which characters for a password or the like (characters similar to the decorative nameplate 58) are written may be pasted. Moreover, you may prepare the protection nameplate by which the character for PIN numbers etc. (character similar to the makeup nameplate 58) was described, without affixing on the makeup nameplate 58 previously. That is, for example, when the decorative name plate 58 is deteriorated, dirty, or discolored due to the frequency of use of the numeric keypad 48, a protective name plate prepared on the decorative name plate 58 is pasted, or the pasted protective name plate is deteriorated, dirty, or colored. In the case of dropping or the like, the top of the numeric keypad 48 can be made clean by pasting (or replacing) another protective nameplate. In these cases as well, theft can be reliably prevented without giving a clue to the third party the password.

  In the above description, a hydraulic excavator has been described as an example of a construction machine.

It is a side view showing the whole structure of the small hydraulic excavator which is the application object of the antitheft device of the construction machine of the present invention. It is a top view showing the whole structure of the small hydraulic excavator which is the application object of the antitheft device of the construction machine of this invention. It is a perspective view showing the detailed structure of the cab of the hydraulic excavator which is the application object of the antitheft device of the construction machine of this invention. It is a circuit diagram showing one embodiment of the antitheft device of the construction machine of the present invention with the principal part composition concerning the boom of a hydraulic drive. It is a top view showing the whole key input device structure which constitutes one embodiment of the antitheft device of the construction machine of the present invention. It is a longitudinal cross-sectional view by the cross section VI-VI in FIG.

Explanation of symbols

41 Controller (determination means, release means)
48 numeric keypad (input switch)
58 Cosmetic nameplate 59 Protection nameplate 59a Tag part

Claims (2)

A plurality of input switches for inputting a personal identification number, a determination unit for determining whether the personal identification number input by these input switches matches a personal identification number stored in advance, and the determination unit has determined that the personal identification number matches Sometimes, in a construction machine anti-theft device comprising a release means for releasing the locked state of the construction machine,
A decorative nameplate provided on the plurality of input switches, each having a code number corresponding to the plurality of input switches;
An anti-theft device for a construction machine comprising a protective name plate on which a character for a personal identification number is written and which can be attached to the decorative name plate. In anti-theft system for a construction machine according to claim 1 Symbol placement, anti-theft system for a construction machine, characterized in that a tag part in the protection nameplate.

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