JP2016069109A - Lift for vehicle maintenance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lift up and down a lifting arm surely and easily by a constant small amount, in a lift for vehicle maintenance.SOLUTION: A lift 10 for vehicle maintenance comprises an inching controller 70 which comprises an inching operation switch 71, for lifting up and down a lifting arm 16 by inching lifting up and down operation, by a predetermined small inching amount, regardless of an on-state continuation time of an on operation, by the single on operation of the inching operation switch 71.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle maintenance lift.

  Conventionally, as a lift for vehicle maintenance, as disclosed in Patent Document 1, a lift arm that moves up and down by an on operation (button pressing operation) of an operation switch (such as a button switch for raising and lowering) is provided. There is one that lifts the vehicle from the floor by applying the provided support to a lift point at the bottom of the vehicle.

  In such a vehicle maintenance lift, the operator aligns the receiving tool to the lift point as follows in order to apply the receiving tool of the lifting arm to the lift point at the lower part of the vehicle.

  i. If the distance between the support and the lift point (height distance) is too far, first raise the lifting arm to bring the support closer to the lift point.

  ii. Move the lifting arm horizontally and position its support just below the lift point.

  iii. Each time the lifting arm is lifted by a minute amount by turning on the lifting operation switch for a short period of time, the horizontal position of the receiver relative to the lift point is confirmed and the receiver is lifted. Align to point.

JP 2002-128482 A

  In the prior art, the lifting arm moves up and down during the time that the ON state by the ON operation of the operation switch continues (while the button switch for raising or lowering is kept pressed). There are problems.

  (1) When the lift arm is lifted by a minute amount in order to align the lifting arm holder with the lift point, the lift operation switch is turned on for a short target time of, for example, a few seconds. Skill is required for operation. If the on-operation is accidentally continued beyond the target time, there is a risk of the vehicle being scratched by the collision of the lifting arm support with a portion other than the lift point at the bottom of the vehicle.

  (2) In order to align the lifting arm support with the lift point, it is necessary to repeatedly raise the lifting arm by a small amount while checking the horizontal position of the support with respect to the lift point. .

  At this time, the operator should carefully look into the lower part of the vehicle from the beginning of the alignment work and kneel on the floor many times so that the lifting arm support will rise without colliding with the lift point at the lower part of the vehicle. And become a tough working posture.

  When an operation switch is provided on the machine body of the lift, the operation of turning on the operation switch for lifting away from the lifting arm and checking the relative positions of the receiving tool and the lift point performed near the lifting arm are performed. I need it. The movement to move closer to and away from the lifting arm is performed many times, which is a complicated operation.

  Even if the operation switch for raising is turned on using the remote control equipped with the operation switch and the relative position of the receiving device and the lift point is confirmed near the lifting arm, the switch described in (1) above. The skill of operation is still necessary. Further, since the lifting arm is moved up and down near the vehicle with a remote controller, there is a great disadvantage when the remote controller is left on due to an operation error or failure of the remote controller.

  (3) In order to finely adjust the maintenance place such as the engine under the vehicle to a height convenient for the operator while the vehicle is lifted up with the lift arm receiving tool placed on the lift point, the lift arm When moving up and down by a minute amount, the operation switch for raising or lowering is turned on for a short target time, and skill is required for switch operation.

  (4) The total lifting time from when the operation switch is turned on to when the lifting arm starts and ends is not only the actual lifting time during which the lift is actually lifted, but also the machine for each lift. It includes characteristics, the length of the pneumatic circuit that removes the fall prevention claw of the lifting arm when it descends, and the lifting operation delay time that is unique to each lift, such as the operating time of the pneumatic equipment. Therefore, when handling multiple types of lifts installed at a vehicle maintenance site, the operator must operate the operation switch of each lift at a timing corresponding to the total lifting operation time specific to each lift. Experience and skill peculiar to the place are required.

  SUMMARY OF THE INVENTION An object of the present invention is to lift a lifting arm reliably and easily by a certain minute amount in a vehicle maintenance lift.

  The invention according to claim 1 includes a lift arm that moves up and down by turning on an operation switch, and lifts the vehicle from the floor by applying a support provided on the lift arm to a lift point at the bottom of the vehicle. The lift has an inching operation switch. Due to one ON operation of the inching operation switch, the lifting arm is moved up and down by a predetermined minute inching amount regardless of the ON state duration of the ON operation. An inching controller is provided.

  According to a second aspect of the present invention, in the inching control according to the first aspect of the present invention, the inching controller performs an inching control from when the inching operation switch is turned on until the lifting arm completes an inching lifting operation of a predetermined minute inching amount. As the time, a time that takes into account the operation delay time unique to the lift is adopted.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the inching operation switch is provided on a remote control that is wirelessly connected to an elevation control circuit of an inching controller.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, when the inching operation switch is repeatedly turned on, the inching controller is provided between a previous on operation and a subsequent on operation. On the condition that the OFF state duration time is less than the predetermined minimum OFF state duration time, the inching / lifting operation of the lifting arm due to the subsequent ON operation is not executed.

  The invention according to claim 5 further comprises detection means for detecting that the vehicle is in a lift-up state in the invention according to any one of claims 1 to 4, wherein the inching controller On the condition that the lift-up state is detected, the inching / lifting operation of the lifting arm due to the ON operation of the inching operation switch is not executed.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the inching controller is attached to the normal controller, and the normal controller has a normal operation switch. The inching controller has an elevating control circuit that moves the elevating arm up and down by an elevating operation signal resulting from the ON operation of the operation switch, and the inching controller sends the elevating operation signal resulting from the ON operation of the inching operation switch to the elevating control circuit of the normal controller. The normal controller is configured to cause the lifting arm to move up and down in the inching by the lifting operation signal transmitted from the inching controller.

(Claim 1)
(a) Every time the inching operation switch is turned on once (in the case of a button switch, it only needs to be pressed once), regardless of the on-state duration of the on operation, anyone can move the lifting arm (without requiring skill). ) The inching up and down operation can be performed by a certain minute inching amount reliably and easily.

  Even if the inching operation switch is turned on for a long time, the lifting arm only rises by a certain minute inching amount, so it is easy to avoid colliding the receiving arm of the lifting arm with a part other than the lift point at the bottom of the vehicle, There is no risk of scratching the vehicle.

  (b) When the operator aligns the lifting arm receiving tool with the lift point, the collision between the receiving tool and the lifting point can be easily avoided as described in (a) above. Therefore, in order to avoid the collision from the beginning of the alignment work, it is not necessary to kneel on the floor surface many times while carefully looking at the lower part of the vehicle, and it is not necessary to take a tight work posture for a long time.

  (c) When the vehicle is lifted up with the lifting arm support attached to the lift point, for example, when maintaining the engine, etc. at the lower part of the vehicle, the operator does not need skill as described in (a) above. Thus, the lifting arm can be moved up and down in an inching manner by a certain amount of minute inching reliably and easily, and the maintenance place under the vehicle can be easily finely adjusted to an appropriate height position convenient for the operator.

  (d) When the inching operation switch is turned on, the elevating arm is moved up and down by a certain minute inching amount (for a short time), so that the malfunction due to the abnormality of the lift can be recognized immediately and the abnormality can be detected early.

(Claim 2)
(e) When multiple types of lifts are installed at the vehicle maintenance site, the inching control time corresponding to the minute inching amount predetermined by the inching controller of each lift is taken into account with the operation delay time unique to the lift. Can be adopted. As a result, when the operator handles any lift, the lifting arm of each lift can be moved up and down in a certain minute inching amount reliably and easily according to (a).

(Claim 3)
(f) Since the inching operation switch is provided on the remote controller, the inching operation switch can be turned on and the relative position between the receiving tool and the lift point can be checked near the lifting arm, which improves workability. Even if the remote controller is left on due to an operation mistake or failure of the remote controller, the lifting arm does not move up and down continuously, and the inconvenience is small.

(Claim 4)
(g) When the inching operation switch is repeatedly turned on at intervals shorter than the minimum OFF state duration, the subsequent ON operation is invalidated and the inching up / down operation is not performed. As a result, the operator obtains a time margin for confirming the lifting / lowering result of the minute inching amount given to the lifting / lowering arm by the ON operation applied to the inching operation switch, and then the next inching lifting / lowering by the next ON operation. The operation can be performed. This is to avoid the occurrence of the same inconvenience as in the continuation of the ON operation by the conventional operation switch.

(Claim 5)
(h) The inching controller does not execute the inching / lifting operation of the lifting arm resulting from the ON operation of the inching operation switch on condition that the detection unit detects that the vehicle is in the lift-up state. When the vehicle is lifted up from the ground, the on / off operation of the inching operation switch is disabled, so that even if someone inadvertently turns on the inching operation switch while the operator is working at the bottom of the vehicle, The arm does not move up and down in the inching and can secure the safety of the operator.

(Claim 6)
(i) Since the inching controller can be used together with the existing normal controller and can be connected to the lift control circuit of the normal controller, the current operability using the normal controller is not impaired.

FIG. 1 is a schematic perspective view showing a vehicle maintenance lift. FIG. 2 is a circuit diagram showing a lift control circuit of a vehicle maintenance lift. FIG. 3 is a circuit diagram showing a lift control circuit of a vehicle maintenance lift. FIG. 4 is a circuit diagram showing another example of a lift control circuit for a vehicle maintenance lift. FIG. 5 is a time diagram showing the output state of the inching lift operation signal based on the ON operation of the inching operation switch. FIG. 6 is a schematic front view showing the inching lifting operation of the lifting arm.

  As shown in FIG. 1, a two-post lift 10 for vehicle maintenance is installed on a floor surface 11 of a maintenance site, and two left and right columns 12, 12 are provided on both sides of a lift work area 13 on the floor surface 11. It stands up through the interval. Both struts 12 and 12 form a gate shape connected by a connecting beam 14.

  The lift 10 is provided with left and right carriages 15 that can be moved up and down in synchronization with each of the columns 12, and left and right lifting arms 16 and 16 are provided on each carriage 15. Each lifting arm 16 includes front and rear support arms 17 and 18 that are supported by each carriage 15 so as to be rotatable in a horizontal plane. Each raising / lowering arm 16 (17, 18) can be expanded-contracted in those axial directions. Each elevating arm 16 (17, 18) is provided with a receiving tool 16A (17A, 18A) at the tip, and each elevating arm 16 is swung and expanded and contracted in a horizontal plane so that the receiving tool 16A can be Align and apply to the lower lift point 2 (FIG. 6).

  The lift arms 16 (17, 18) of the lift 10 are moved together with the carriages 15 that are lifted and lowered by turning on an operation switch (a normal operation switch 21 of the normal controller 20 or an inching operation switch 71 of the inching controller 70) described later. Move up and down. That is, when the operation switch activates an elevating drive unit 30 described later, the carriages 15 are moved up and down in synchronization with each other, and the lift arms 16 provided on the carriages 15 are moved up and down in synchronization with each other. Therefore, the lift 10 applies the receiving tool 16A (17A, 18A) provided on each lifting arm 16 (17, 18) to the lift point 2 at the lower part of the vehicle 1 and moves each lifting arm 16 up and down. The vehicle 1 is lifted up from the floor surface 11.

  Here, the lift 10 controls the elevating drive unit 30 shown in FIG. 3 by the normal controller 20 shown in FIG. 2, and moves the elevating arms 16 (17, 18) up and down.

  As shown in FIG. 2, the normal controller 20 includes an up button 21U and a down button 21D as push button type normal operation switches 21. The ascending operation signal AU and the descending operation signal AD used in the following description correspond to the ascending / descending operation signal of the present invention caused by the on operation of the ascending button 21U or the descending button 21D of the normal operation switch 21.

  In the normal controller 20, when the on operation of the up button 21U of the normal operation switch 21 by the operator is transmitted to the up control circuit 22U by wire (or wireless), the up control circuit 22U is caused by the on operation of the up button 21U. The ascending operation signal AU is input to the motor 41M for the hydraulic pump 41 included in the hydraulic unit 40 in the ascending / descending drive unit 30 over the same length of time as the ON state duration of the ON operation of the ascending button 21U. As a result, the hydraulic pump 41 sends oil to the supply pipes of the hydraulic cylinders 42 and 42 corresponding to the carriages 15 to extend the hydraulic cylinders 42 and 42, and as a result, the carriages 15 and the lifting arms 16 are moved. Raise.

  On the other hand, in the normal controller 20, when the on operation of the lowering button 21D of the normal operation switch 21 by the operator is transmitted to the lowering control circuit 22D by wire (or wireless), the lowering control circuit 22D operates the on operation of the lowering button 21D. The descending operation signal AD resulting from the above is input to the descending electromagnetic valve 51 provided in the pneumatic unit 50 in the ascending / descending drive unit 30 for the same length of time as the on state duration of the on operation of the descending button 21D. Thus, the descending solenoid valve 51 extends the pneumatic cylinders 52, 52 corresponding to the left and right lifting arms 16, thereby removing the fall preventing claws 53, 53 of the lifting arms 16 and preventing them from falling. Is released. Further, the lowering solenoid valve 51 extends the relief valve cylinder 54 and inserts the conduction path of the relief valve 55 into the discharge pipes of the hydraulic cylinders 42 and 42, and those loads are applied to the lifting arms 16 by their loads. The hydraulic cylinders 42 and 42 are contracted, and as a result, each carriage 15 and each lifting arm 16 are lowered.

  In the elevating drive unit 30, in addition to the actual elevating time (tuy, tdy) during which the lift is actually elevating, the mechanical characteristics of the hydraulic unit 40 and the pneumatic unit 50 and the fall prevention claw 53 of the elevating arm 16 are removed when descending. In addition, the piping length of the pneumatic unit 50 that operates the relief valve 55, the operation time of the pneumatic device, and the like become operation delay times (tuz, tdz) that are specific when the lift 10 is raised or lowered.

  In addition, the pneumatic unit 50 of the raising / lowering drive part 30 can deform | transform like the pneumatic unit 60 shown in FIG. That is, when the lowering control circuit 22D inputs a lowering operation signal to the lowering electromagnetic valve 61 of the pneumatic unit 60 by turning on the lowering button 21D in the normal controller 20, the lowering electromagnetic valve 61 corresponds to the left and right lifting arms 16. The pneumatic cylinder 62 is contracted, and the fall prevention claws 63 and 63 of the lifting arms 16 are removed to release the fall prevention action. Further, the lowering solenoid valve 61 turns on the claw release detection switch 64 by its contraction stroke, and the hydraulic cylinder 42 in the hydraulic unit 40 of the lift drive unit 30 opens the conduction path of the relief valve 65 by the ON signal of the claw release detection switch 64. 42, the hydraulic cylinders 42 and 42 are contracted by the load acting on the lifting arms 16, and as a result, the carriages 15 and the lifting arms 16 are lowered. Also in this case, the mechanical characteristics of the pneumatic unit 60, the pipe length of the pneumatic unit 60 for operating the relief valve 65, the operation time of the pneumatic equipment, etc. When the lift 10 is lowered, the operation delay time is unique.

  However, the lift 10 is provided with an inching controller 70 attached to the normal controller 20 as shown in FIG. 2, and the lifting arms 16 are moved up and down in the following manner.

  (I) The inching controller 70 has a push button type inching operation switch 71 as shown in FIG. 2, and includes an up button 71U and a down button 71D as the inching operation switch 71. The inching controller 70 includes a receiver 72 and a lift control circuit 73, and the lift control circuit 73 includes one-shot timers 73U and 73D. The ascending operation signal BU and the descending operation signal BD used in the following description correspond to the ascending / descending operation signal of the present invention caused by the on operation of the ascending button 71U or the descending button 71D of the inching operation switch 71.

  In the inching controller 70, when the on operation of the ascending button 71U of the inching operation switch 71 by the operator is transmitted to the receiver 72 by radio (or wired), the receiver 72 activates the elevation control circuit 73. The lift control circuit 73 transmits the lift operation signal BU resulting from the ON operation of the lift button 71U to the lift control circuit 22U of the normal controller 20 for a minute inching time tu defined by the lift time one-shot timer 73U. As a result, the ascending control circuit 22U of the normal controller 20 inputs this ascending operation signal BU to the motor 41M for the hydraulic pump 41 provided in the hydraulic unit 40 of the ascending / descending drive unit 30 for a minute inching time tu, The inching is raised. Therefore, the inching controller 70 is caused by one ON operation of the ascending button 71U of the inching operation switch 71, and the ON state duration time tuL or tuS of the ON operation (for example, the long press time tuL ≧ tu shown in FIG. Or, regardless of the short press time tuS <tu), the lift control circuit 22U is input for a predetermined minute inching time tu, and the lift operation signal BU is input to the motor 41M of the hydraulic pump 41. As a result, a predetermined minute inching amount is obtained. Each lifting arm 16 is moved up in the inching as much as (a minute lift length).

  On the other hand, in the inching controller 70, when the operator turns on the lowering button 71 </ b> D of the inching operation switch 71 to the receiver 72 by wireless (or wired), the receiver 72 activates the elevation control circuit 73. The raising / lowering control circuit 73 transmits the lowering operation signal BD resulting from the ON operation of the lowering button 71D to the lowering control circuit 22D of the normal controller 20 for the minute inching time td defined by the lowering time one-shot timer 73D. As a result, the lowering control circuit 22D of the normal controller 20 inputs this lowering operation signal BD to the lowering electromagnetic valve 51 provided in the pneumatic unit 50 of the lifting drive unit 30 for a minute inching time td, and lowers each lifting arm 16 by inching. Make it work. Accordingly, the inching controller 70 is caused by one ON operation of the lowering button 71D of the inching operation switch 71, and the ON state duration time tdL or tdS of the ON operation (for example, the long press time tdL ≧ td or the short press time tdS). Regardless of <td), the lowering control circuit 22D is input for the predetermined minute inching time td, and the lowering operation signal BD is input to the lowering solenoid valve 51. As a result, the predetermined minute inching amount (minute lift length) is obtained. Only the lifting arms 16 are moved in the inching down direction.

  In the inching controller 70, the inching operation switch 71 can be provided on the remote controller 74 that is wirelessly connected to the receiver 72 and the elevation control circuit 73. The wireless remote controller 74 is driven by the electric power generated by the force with which the up button 71U and the down button 71D are pressed, and no battery is required. Each of the ascending button 71U and the descending button 71D of the wireless remote controller 74 is given a unique production ID, and by transmitting those pressing signals (ON operation signals) to the receiver 72 together with their IDs, Do not cause troubles such as a crossover signal in the maintenance area.

Therefore, the lifting / lowering operation of the vehicle 1 by the lift 10 is performed as follows.
(1) The receiving tool 16A (17A, 18A) at the tip of each lifting arm 16 (17, 18) is inserted into the lower part of the vehicle 1 (FIG. 6A).

  (2) When the support 16A of each lifting / lowering arm 16 and the lift point 2 at the lower part of the vehicle 1 are too far apart from each other, it is difficult to align them. The lifting button 71U of the inching operation switch 71 raises each lifting / lowering arm 16 by inching. Operate and position the receiver 16A of each lifting arm 16 directly below the lift point 2.

  (3) While confirming the positional relationship between the receiver 16A of each lifting arm 16 and the lift point 2 at the bottom of the vehicle 1, until the receiver 16A engages with the lift point 2, the lift button 71U of the inching operation switch 71 is used. Each lifting arm 16 is moved upward by a minute inching amount.

  (4) When the receiving device 16A of each lifting arm 16 is engaged with the lift point 2 at the lower part of the vehicle 1, each lifting arm 16 is lifted by the lifting button 21U of the normal operation switch 21, and then each lifting and lowering is performed by the lowering button 21D if necessary. The arm 16 is lowered, and as a result, the vehicle 1 is set to an appropriate lift-up position.

The lift 10 has the following operational effects by the configuration (A) described above.
(a) Each time the inching operation switch 71 is turned on once (in the case of the button switches 71U and 71D, it is only pressed once), the on-state duration time of the on operation (for example, the long press time tuL when rising or falling) , TdL, or short press time tuS, tdS), the lifting arm 16 can be moved up and down by a certain minute inching amount surely and easily by anyone (without requiring skill).

  Even if the inching operation switch 71 is turned on for a long time, the elevating arm 16 rises only by a certain minute inching amount, so that the receiving tool 16A of the elevating arm 16 collides with a portion other than the lift point 2 at the lower part of the vehicle. It can be easily avoided and there is no risk of scratching the vehicle.

  (b) When the operator aligns the receiving tool 16A of the lifting arm 16 with the lift point 2, the worker can easily avoid the collision between the receiving tool 16A and the lift point 2 as described above (a). Therefore, in order to avoid the collision from the beginning of the alignment work, it is not necessary to kneel on the floor surface many times while carefully looking at the lower part of the vehicle, and it is not necessary to take a tight work posture for a long time.

  (c) When the vehicle is lifted up with the receiving member 16A of the lifting arm 16 applied to the lift point 2, for example, when an engine or the like is maintained at the lower part of the vehicle, the operator needs skill as described in (a) above. Accordingly, the lifting arm 16 can be moved up and down in a certain and minute amount by a certain amount of inching, and the maintenance location under the vehicle can be easily finely adjusted to an appropriate height position convenient for the operator.

  (d) When the inching operation switch 71 is turned on, the elevating arm 16 is raised and lowered by a certain minute inching amount (for a short time), so that a malfunction due to a lift abnormality can be recognized immediately, and an abnormality can be detected early.

  (e) Since the inching operation switch 71 is provided on the remote controller 74, the inching operation switch 71 can be turned on and the relative position between the support 16 </ b> A and the lift point 2 can be confirmed near the lifting arm 16. Good workability. Even if the remote controller 74 is left on due to an operation mistake or failure, the lifting arm 16 does not continuously move up and down, and the inconvenience is small.

  (f) Since the inching controller 70 can be used together with the existing normal controller 20 and can be connected to the lifting / lowering drive unit 30 of the normal controller 20, the current operability using the normal controller 20 is not impaired.

  (II) The lift control circuit 73 of the inching controller 70 starts from the ON operation timing of the inching operation switch 71 (the up button 71U and the down button 71D) until the lift arm 16 completes the inching lift operation of a predetermined minute inching amount. As the inching control time (same as the above-mentioned minute inching time tu or td), the above-described operation delay time (tuz, tdz) unique to the lift 10 when it rises or descends relative to the actual lifting time (tuy, tdy). ) Is taken into account. Therefore, [tu = tuy + tuz] and [td = tdy + tdz] (FIG. 5). That is, the inching control time (tu or td) controlled by the inching controller 70 can be varied, and the influence of the operation delay due to the mechanical characteristics of the lift 10 and the piping length of the hydraulic unit 40 or the pneumatic unit 50 can be reduced.

  That is, when a plurality of types of lifts 10 are installed in the vehicle maintenance shop, the inching control time (tu or td) corresponding to the minute inching amount determined in advance by the inching controller 70 of each lift 10 is unique to the lift 10. What added the operation delay time (tuz, tdz) can be adopted. As a result, when the operator handles any lift 10, the lifting arm 16 of each lift 10 can be moved up and down in a certain small inching amount reliably and easily according to (a).

  (III) The raising / lowering control circuit 73 of the inching controller 70 is turned off between the previous on operation and the subsequent on operation when the inching operation switch 71 (the up button 71U and the down button 71D) is repeatedly turned on. On the condition that the state duration time f is less than the predetermined minimum OFF state duration time fmin, the inching raising / lowering operation of the raising / lowering arm 16 resulting from the subsequent ON operation is not executed.

  As a result, the operator obtains a time margin for confirming the lifting / lowering result of the minute inching amount applied to the lifting / lowering arm 16 by the ON operation applied to the inching operation switch 71, and then the next ON operation by the next ON operation. Inching lifting operation can be performed. This is to avoid the occurrence of the same inconvenience as in the continuation of the ON operation by the conventional operation switch.

  (D) The lift 10 has detection means 80 for detecting that the vehicle 1 is in a lift-up state (FIG. 2). The detection means 80 is configured by a load sensor provided at the tip of the lift arm 16 or a limit switch provided on the support column 12 so as to detect that the lift arm 16 is at a certain height or higher than the lower limit position. .

  The detection result of the detection means 80 is transmitted to the receiver 72 of the inching controller 70 and transmitted from the receiver 72 to the elevation control circuit 73. The lift control circuit 73 does not execute the inching lift operation of the lift arm 16 resulting from the ON operation of the inching operation switch 71 on the condition that the detection unit 80 detects that the vehicle 1 is in the lift-up state. I am going to do that. Since the inching lifting operation applied to the lifting arm 16 when the vehicle 1 is being lifted up may lead to vehicle shake or the like, the ON control result of the inching operation switch 71 is electrically cut off (invalidated) by the lifting control circuit 73. ) And the inching up / down operation is not performed even if the remote control is operated.

  Further, when the vehicle 1 is lifted up from the ground, by turning off the inching operation switch 71, someone inadvertently switches the inching operation switch 71 during the work of the worker at the lower part of the vehicle 1. Even if the on-operation is performed, the lifting arm 16 does not move up and down in the inching, and the safety of the operator can be secured.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention.

  According to the present invention, in the lift for vehicle maintenance, the lifting arm can be moved up and down by a certain small inching amount reliably and easily regardless of the ON state duration of the ON operation of the operation switch.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Lift point 10 Lift for vehicle maintenance 16 Lifting arm 20 Normal controller 21 Normal operation switch 30 Lifting drive unit 70 Inching controller 71 Inching operation switch 73 Lifting control circuit 73U Rising time one-shot timer 73D Lowering time one-shot Timer 74 Remote control 80 Detection means

Claims (6)

In a vehicle maintenance lift that has a lifting arm that moves up and down by turning on an operation switch, and lifts the vehicle from the floor surface by applying a support provided on the lifting arm to a lift point at the bottom of the vehicle,
An inching controller that has an inching operation switch and causes the lifting arm to move up and down by a predetermined minute inching amount regardless of the on-state duration of the on operation due to one on operation of the inching operation switch. A lift for vehicle maintenance characterized by comprising.   The inching controller adopts the inching control time from when the inching operation switch is turned on until the lifting arm completes the inching up / down operation of a predetermined minute inching amount, taking into account the operation delay time specific to the lift. The vehicle maintenance lift according to claim 1.   The vehicle maintenance lift according to claim 1 or 2, wherein the inching operation switch is provided on a remote controller wirelessly connected to an elevation control circuit of an inching controller.   The inching controller is configured on the condition that when the inching operation switch is repeatedly turned on, the off state duration between the previous on operation and the subsequent on operation is less than a predetermined minimum off state duration. The vehicle maintenance lift according to any one of claims 1 to 3, wherein the inching lifting operation of the lifting arm due to the turning-on operation is not executed. Detecting means for detecting that the vehicle is in a lift-up state;
The inching controller does not execute the inching lifting operation of the lifting arm caused by the ON operation of the inching operation switch on condition that the detection means detects that the vehicle is in the lift-up state. The lift for vehicle maintenance described in Crab. The inching controller is usually attached to the controller,
The normal controller has a normal operation switch, and has a lift control circuit for moving the lift arm up and down by a lift operation signal resulting from the ON operation of the normal operation switch.
The inching controller normally transmits the raising / lowering operation signal resulting from the ON operation of the inching operation switch to the raising / lowering control circuit of the controller,
The vehicle controller lift according to any one of claims 1 to 5, wherein the normal controller causes the lifting arm to move up and down in the inching by a lifting operation signal transmitted from the inching controller.

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