JP5411536B2 - Operation machine control lever device - Google Patents

Description

  The present invention relates to an operation lever device using a triaxial joystick provided in a work machine such as an aerial work vehicle, and more particularly to an operation lever device having a grip provided with a switch means.

  In the operation system of the work machine, as a safety measure for the operation, as a means for confirming that the operation of the operation lever by the operator is performed with the intention of operation, in other words, that there is no erroneous operation, However, since the enable switch is operated as a previous stage of the operation of the operation lever, it is often provided on the operation lever in consideration of its operability.

  As a work machine provided with such an operation lever device, for example, an aerial work vehicle Z as shown in FIG. 9 is known. Further, as an operation lever device for a working machine having an operation switch with an enable switch, one as shown in Patent Document 1 is known.

  By the way, as shown in FIG. 9, the aerial work vehicle Z extends and retracts to a swivel base 5 mounted on the vehicle body 2 of the travelable vehicle 1 provided with wheels 3 and outriggers 4 before and after the vehicle body 2. The base end portion of the boom 7 is connected so as to be able to move up and down, and the telescopic boom 7 is driven to extend and contract by the telescopic cylinder 9 and is driven to move up and down by the hoisting cylinder 8. Can be driven to turn.

  A work table 12 is attached to the distal end of the telescopic boom 7 via a posture maintaining member 10 that maintains the posture of the telescopic boom 7 at all times regardless of the up-and-down movement of the telescopic boom 7. Is driven by the swing drive device 11.

  Further, the work platform 12 of the aerial work platform Z has the operation lever device X for driving the swivel drive device 6, the hoisting cylinder 8, the telescopic cylinder 9, the swing drive device 11 and other devices. Is provided. Here, the configuration of the operation lever device X will be briefly described.

  As shown in FIG. 10, the operation lever device X is composed of a joystick-type operation lever, and includes a base 101 including a support mechanism and a tilt / rotation detection mechanism, and can protrude and tilt upward from the base 101. The control rod 102 is attached to the control rod 102, and the grip 103 is rotatably attached to the tip of the control rod 102. The operation rod 102 is held so as to be tiltable in the front-rear direction (arrow AB direction) and the left-right direction (arrow CD direction) by a pivot bearing mounted in the base 101. The respective tilt angles in the front-rear direction and the left-right direction are detected by a first potentiometer 106 and a second potentiometer 107 attached to the base 101, and a detection signal corresponding to each tilt angle is output. .

  Further, the operation rod 102 is urged in a direction in which the tilt displacement of the operation rod 102 returns to the original by a biasing spring (not shown) provided in the base 101, and the operation rod 102 is in a tilted state. When the operator's hand leaves the rod 102 and the restriction action is released, the rod 102 is automatically returned to the neutral position.

  The telescopic boom 7 is driven up and down by a control signal output from the control means in response to a detection signal from the first potentiometer 106, and is output from the control means in response to a detection signal from the second potentiometer 107. Expansion and contraction is driven by the signal.

  On the other hand, the grip 103 has a two-stage structure composed of an upper grip 104 and a lower grip 105 arranged on the same axis. The lower grip 105 is disposed coaxially with the central axis of the operation rod 102 and is attached to the operation rod 102 so as to be rotatable in the direction of arrow FG. The lower grip 105 is attached with a third potentiometer 108 that detects the rotation angle of the lower grip 105 and outputs a detection signal corresponding to the rotation angle. The telescopic boom 7 is driven to turn by a control signal output from the control means in response to the signal.

The upper grip 104 is provided with the enable switch 114. The enable switch 114 includes a main body portion 115 and a switch operation portion 116 attached to the main body portion 115 so as to be able to protrude. The enable switch 114 is provided on the side portion of the upper grip 104 so as to protrude radially outward. It has been. The switch operating portion 116 moves is biased in a direction of leaving collision et al or the body portion 115 by a biasing spring (not shown), the switch operating portion 116 is pressed in the arrow E direction to the main body 115 side Then, the main body 115 is configured to output an ON signal.

The enable switch 114 determines that the detection signal of the third potentiometer 108 is valid by the control means when the lower grip 105 is rotated while the switch operation unit 116 is pushed in, and responds to the detection signal. The telescopic boom 7 is pivoted.

  Note that the function of the enable switch 114 is the same in the up-and-down motion and the telescopic motion of the telescopic boom 7 based on the tilting operation of the operating rod 102.

  In addition, the upper grip 104 and the lower grip 105 are provided with an upper return mechanism 111 and a lower return mechanism 112 that restrict the rotation range of these and automatically return them to their original neutral positions. Yes.

  Here, an operation method of the operation lever device X will be briefly described.

  The work using the aerial work platform Z is performed by an operator who has boarded the work table 12 appropriately operating the operation lever device X provided on the work table 12. In this case, the operation lever device X is disposed at the end of the work table 12 near the swing drive device 11, and accordingly, an operator who rides on the work table 12 and operates the operation lever device X. For this purpose, the direction from the work table 12 toward the swing drive device 11 is “front”, and the operator basically operates the operation lever device X while standing toward the front.

  Then, the operation of the operation lever device X is performed by using the fingers 121 other than the thumb 122 to hold the upper grip 104 in a state where the palm 123 is placed on the upper grip 104 of the grip 103 as shown by a chain line in FIG. The operating rod 102 is tilted while holding the enable switch 114 with one of the fingers 121 other than the thumb 122, or with the thumb 122 while pressing the enable switch 114 with one of the fingers 121 other than the thumb 122. When the lower grip 105 is rotated, or the enable switch 114 is pushed with any of the fingers 121 other than the thumb 122, the tilting operation of the operating rod 102 and the rotating operation of the lower grip 105 by the thumb 122 are simultaneously performed. Thus, the telescopic boom 7 is raised and lowered, and the telescopic boom is retracted. 7 of the turning operation, or undulating and stretching operation and the turning operation of the telescopic boom 7 is what is done properly.

  If the enable switch 114 is not pushed in each of these operations, the telescopic boom 7 operates even if the operation rod 102 is tilted or the lower grip 105 is rotated. Needless to say, however, even if the enable switch 114 is initially pushed and the operation rod 102 is tilted in this state, the telescopic boom 7 is moved up and down or telescopically (that is, each operation) If the finger is released from the enable switch 114 and the push-in operation on the enable switch 114 is released during the operation, the hoisting motion, telescopic motion, All of the turning movements are stopped at that time. If the push of the enable switch 114 is released during the operation and the operation of the telescopic boom 7 is stopped, the telescopic boom 7 does not operate even if the enable switch 114 is pushed again. Once the operation lever device X is returned to the neutral state, it is necessary to perform the operation again.

JP 2002-318628 A

  By the way, as described above, the grip 103 provided at the tip of the operation rod 102 has a two-stage configuration composed of an upper grip 104 and a lower grip 105, and the tilting operation of the operation rod 102 in the front-rear and left-right directions and the lower grip 105 are performed. In the three-axis joystick-type operation lever device X configured to perform the rotation operation, the operation rod 102 can be tilted by placing a palm on the upper grip 104. Even if the upper grip 104 is slightly rotated due to a change in work posture or the like, the lower grip 105 is erroneously rotated accordingly (that is, a rotation operation detection signal is erroneously output). This is useful in terms of ensuring operational reliability.

  However, in actual high-altitude work, the operator works on the front side in the line-of-sight direction while operating the lever while facing the front side of the workbench 12 (that is, the swing drive device 11 side). The anti-swing drive device 11 side (ie, the back side) is easy to secure the work space because there are no obstacles such as various devices on the front side of the work table 12. I often work in However, even in this case, since the operation lever device X is provided on the front side of the work table 12 (on the side of the swing drive device 11), the operator twists the body or the neck and moves the work table. The operation lever device X on the front side of the work table 12 must be operated while confirming the situation such as safety on the rear side of the work table 12. The working state is not only the normal movement operation of the workbench 12 but also, for example, the operation lever device X must be operated with the other hand while removing an obstacle existing in the movement path with one hand. It can happen even in the work situation that must be done.

  On the other hand, in order to turn the telescopic boom 7 by operating the operating lever device X, the lower grip 105 must be rotated while pushing the enable switch 114 provided on the grip 103. This operation requires two independent operations, the push-in operation of the enable switch 114 and the rotation operation of the lower grip 105, to be performed simultaneously with one hand, and is a very tired operation. When the operation rod 102 is tilted in the front-rear direction or the left-right direction in addition to the turning operation of the telescopic boom 7, the hand is twisted and tilted when the hoisting operation or the telescopic operation of the telescopic boom 7 is performed in parallel. Therefore, it is difficult to maintain the force for pushing the enable switch 114.

  Such a situation in which it is difficult to maintain the force for pushing the enable switch 114 is particularly while checking the safety condition on the back side of the work table 12 by twisting the body or the neck as described above. In the work situation where the operation lever device X on the front side of the workbench 12 has to be operated, it is inevitably likely to occur. Accordingly, the input of the switch signal from the enable switch 114 is interrupted during the work. Therefore, it is easy to happen that the entire work is interrupted unexpectedly.

In view of such a situation, in order to realize an operation with less fatigue and no malfunction,
(A) to prevent the pushing operation from being accidentally released during the work of pushing the enabling switch 114;
(B) Even if the upper grip 104 is accidentally rotated to some extent due to twisting of the wrist during operation or the like, the influence does not reach the lower grip 105;
(C) Reduce the burden on the wrist during operation by reducing the number of operation items that require simultaneous operation,
(D) The operability of the fine movement operation of the telescopic boom 7 performed by rotating the lower grip 105 alone is not impaired.
However, effective technology from such a viewpoint has not been proposed yet.

  SUMMARY OF THE INVENTION The present invention has been made with the object of providing an operating lever device for a working machine that can realize an operation that is easy to operate with little fatigue and that does not malfunction.

  In the present invention, the following configuration is adopted as a specific means for solving such a problem.

In the first invention of the present application, a base, an operating rod having an operating rod base end attached to the base so as to be tiltable in two axial directions substantially orthogonal to each other, a grip provided at the tip of the operating rod, A tilting operation detection signal output means for detecting a tilting direction and a tilting amount of the operation rod and outputting a tilting operation detection signal corresponding to the tilting direction and the tilting amount; Rotation operation detection signal output means for outputting a rotation operation detection signal corresponding to the rotation direction and rotation amount, and signals from the tilt operation detection signal output means and the rotation operation detection signal output means are received. A work machine comprising: a control unit that outputs a control signal; and a switch unit that is provided on the grip and is operated to be pushed to output a push operation detection signal and allow the control signal to be output from the control unit. In the control lever device, A grip is provided with an upper grip and a lower grip which are provided on the same axis and are relatively rotatable, and is configured such that the rotation operation detection signal output means is activated by a rotation operation of the lower grip. When the upper grip is rotated to the left and right sides beyond the play range, the lower grip is left and right by the upper grip when the upper grip is rotated to the left and right sides beyond the play range. is rotated on each side is characterized in that it is configured to rotate the operation detection signal to the right and left sides corresponding to the respective grip rotating direction from the rotation operation detection signal output means is output.

  According to a second invention of the present application, in the operating lever device of the working machine according to the first invention, the grip is opposed to either one of the upper grip and the lower grip of the grip with a predetermined angle in the rotation direction. While a pair of engagement surfaces are provided, an engagement member that selectively engages with the pair of engagement surfaces in the rotation direction is provided on the other side of the upper grip and the lower grip. It is characterized by.

  In a third invention of the present application, in the operation lever device of the work machine according to the second invention, the engagement member is configured integrally with either one of the upper grip or the lower grip, or The rotating position can be relatively rotated with respect to either the upper grip or the lower grip, and the rotating position is held at the neutral position by the biasing means when the operating force is released. It is said.

  According to a fourth invention of the present application, in the operating lever device for a working machine according to the first, second or third invention, the switch means is provided in the upper grip of the grip.

  In the present invention, the following effects can be obtained.

(A) According to the operating lever device of the working machine according to the first invention of the present application, the grip is a two-stage structure including an upper grip and a lower grip which are provided coaxially and are relatively rotatable. The rotation operation detection signal output means is operated by the rotation operation of the lower grip, while a predetermined play in the rotation direction is provided between the upper grip and the lower grip, When the grip is rotated beyond the play range, the lower grip is rotated by the upper grip, and the rotation operation detection signal is output from the rotation operation detection signal output means.
(A-1) When a predetermined play in the rotation direction is provided between the upper grip and the lower grip so that the lever operation is performed while holding the upper grip, for example, in an unreasonable posture Even if the upper grip is slightly rotated due to twisting of the wrist, etc., as long as the amount of rotation is within the range of play, the upper grip does not affect the lower grip. The rotation operation detection signal is not erroneously output from the rotation operation detection signal output means, and the reliability of the operation is ensured.
(A-2) Configuration in which, when the upper grip is rotated beyond the play range, the lower grip is rotated by the upper grip, and a rotation operation detection signal is output from the rotation operation detection signal output means. By turning the upper grip while pushing the enable switch, only the lower grip can be rotated to output a rotation operation detection signal.For example, the upper grip can be grasped, Compared to a configuration in which a rotation operation detection signal is output for the first time by further rotating the lower grip while pushing the enable switch, the number of operation items that need to be operated simultaneously is smaller. This reduces the degree of twisting of the wrist during operation and reduces hand fatigue. As a result, it is possible to avoid erroneous stoppage of the work machine due to inadvertent release of the enable switch pressing operation during the operation, and to achieve highly reliable work. The
(A-3) In the above play range, the lower grip can be rotated independently of the upper grip separately from the upper grip while the palm is placed on the upper grip. The telescopic boom can be finely operated, and the lower boom is rotated in conjunction with the upper grip rotating operation. The fine movement operability of the turning movement is ensured.
Etc. are obtained.

  (B) In the operating lever device for a working machine according to the second invention of the present application, a pair of engagements facing at a predetermined angle in the rotational direction on either one of the upper grip and the lower grip of the grip On the other side of the upper grip and the lower grip, an engaging member that selectively engages with the pair of engaging surfaces in the rotation direction is provided on the other side. Since the play is ensured by the configuration, the effect described in (a) can be realized at a lower cost.

(C) According to the operating lever device of the working machine according to the third invention of the present application, in addition to the effect described in (b) above, the following specific effect is obtained. That is, in the operation lever device of the working machine according to the present invention, the engagement member is configured integrally with either the upper grip or the lower grip, or is either the upper grip or the lower grip. In the state where the relative rotation is possible and the operation force is released, the rotation position is held at the neutral position by the biasing means.
(C-1) According to the former configuration, when the upper grip exceeds the range of play due to its rotation, the rotation of the lower grip is immediately started with the further rotation of the upper grip. Therefore, the responsiveness of the lower grip, and thus the responsiveness of the pivoting movement of the telescopic boom is improved, the positioning accuracy of the telescopic boom in the pivoting direction is improved, and the work accuracy is ensured.
(C-2) According to the latter configuration, when the upper grip is rotated and the lower grip is rotated via the upper grip, the amount of rotation of the upper grip is within the range of play. Even if the engaging member is engaged with the engaging surface beyond, the lower grip is not immediately rotated, and the lower grip is rotated with a time shift due to the elasticity of the biasing means. The rotation operation detection signal is output, and at the time of engagement between the engagement member and the engagement surface, the rotation resistance of the upper grip increases due to the addition of the elastic force of the biasing means. Since this can be easily recognized, for example, the turning motion of the telescopic boom can be gradually accelerated by reducing the operating force on the upper grip, and the safety of the operation shock is small. High work becomes possible,
When the lower grip is operated to rotate independently, the lower grip operates beyond the play range, and the urging force is applied even when the engaging member in the neutral position engages with the engaging surface. Since the upper grip is rotated by the elastic force of the means, that is, the upper grip gripped by the palm is avoided from being rotated carelessly, the pushing operation of the enable switch is interrupted. Is prevented as much as possible, and reliable work is realized,
Etc. are obtained.

  (D) According to the operating lever device of the working machine according to the fourth invention of the present application, in addition to the effects described in (a), (b) or (c), the following specific effects are obtained. It is done. That is, in the operation lever device of the working machine of the present invention, the switch means is provided on the upper grip of the grip, so that the operator can push the enable switch without difficulty at the same time as holding the upper grip, The operation and the continuation of the operation are easy, and the occurrence of such a situation that the operation of the telescopic boom is inadvertently stopped due to the finger separating from the enable switch during the work is prevented as much as possible. The above reliability will be further enhanced.

It is a principal part side view which shows the operation state of the operation lever apparatus which concerns on embodiment of this invention. It is. It is a section schematic diagram showing the structure of the operation lever device concerning a 1st embodiment of the present invention. It is action | operation explanatory drawing of the operation lever apparatus shown in FIG. It is a cross-sectional schematic diagram which shows the structure of the operating lever apparatus which concerns on 2nd Embodiment of this invention. FIG. 5 is a first operation explanatory view of the operation lever device shown in FIG. 4. It is 2nd action | operation explanatory drawing of the operation lever apparatus shown in FIG. FIG. 6 is a third operation explanatory view of the operation lever device shown in FIG. 4. It is an operation characteristic figure of an operation lever device concerning the invention in this application. It is a general view of an aerial work vehicle. It is structure explanatory drawing of the conventional general operation lever apparatus.

  Hereinafter, an operation lever device of a working machine according to the present invention will be specifically described based on preferred embodiments.

  The configuration of an aerial work vehicle Z as an example of a work machine targeted by the present invention is the same as that of the aerial work vehicle Z shown in FIG. 9 described in the “Background Art” section. The explanation is omitted, and the corresponding explanation in the section “Background Art” is used.

Further, as shown in FIG. 1, the operating lever device of the working machine according to the present invention includes a grip 21 having a two-stage structure of an upper grip 22 and a lower grip 23, and the greatest feature thereof. Is a linkage structure of the upper grip 22 and the lower grip 23, and outputs other signals by detecting the other structures, that is, the base and the mounting structure of the operating rod to the base, the tilting direction and the tilting amount of the operating rod. Tilting operation detection signal output means (first and second potentiometers) for detecting the rotation direction and the rotation amount of the lower grip 23 of the grip 21, and a rotation operation detection signal corresponding to the rotation direction and the rotation amount. The configuration of the rotation operation detection signal output means (third potentiometer) to be output is the same as that of the operation lever device shown in FIG. 10 described in the section “Background Technology”. With the aid of appropriate explanation not described in here is explained as the greatest feature of the present invention the "linkage structure of the upper grip 22 and the lower grip 23" mainly.
I: First Embodiment FIG. 1 shows a grip 21 according to a first embodiment of the present invention and how to operate it. As described above, the grip 21 has a two-stage structure composed of an upper grip 22 and a lower grip 23, both of which are relative to the operation rod 20 (the same structure as the operation rod 102 described in the background art). It is mounted movably. An enable switch 24 (corresponding to “switching means” in the claims) is provided on one side of the upper grip 22 and includes a main body portion 25 and a pushing member 26.

  As shown in FIG. 1, the operation lever device X is operated by placing a palm 123 on the upper surface of the upper grip 22 and wrapping the upper grip 22 with a finger 121 other than the palm 123 and the thumb 122. Grab this. In this case, when the thumb 122 does not need to rotate the lower grip 23, the thumb 122 holds the upper grip 22 like the other fingers 121, but when the thumb grip 23 needs to rotate, As shown in the figure, it is attached to the side surface of the lower grip 23. Further, any one of the fingers 121 other than the thumb 122 is attached to the pushing member 26 so that the pushing member 26 of the enable switch 24 can be pushed.

  In the gripping state, when the telescopic boom 7 is expanded or retracted, the operating rod 20 is moved in the front-rear direction or the left-right direction by a required angle while the pusher member 26 of the enable switch 24 is pressed with the finger 121. Tilt. By the tilting operation of the operating rod 20, tilting operation detection signals corresponding to the tilting direction and the tilting amount correspond to the first potentiometer 106 and the second potentiometer 107 ("tilting operation detection signal output means" in the claims). ) To the control means (not shown), and the telescopic boom 7 is driven up and down or extended and retracted.

  On the other hand, the swivel drive of the telescopic boom 7 is performed by rotating the lower grip 23. As described below, there are two modes for rotating the lower grip 23. One is an operation mode in which the lower grip 23 is indirectly rotated by a rotation operation of the upper grip 22, and the other is a mode in which only the lower grip 23 is directly operated and rotated. These two rotation forms are realized by a configuration unique to the present invention, and will be described in detail below.

  FIG. 2 schematically shows the cross-sectional shapes of the upper grip 22 and the lower grip 23 of the grip 21.

  The upper grip 22 is rotatably attached to the operation rod 20. A projecting engagement member 27 having a predetermined width is formed integrally with the upper grip 22 on one side of the upper grip 22. The upper grip 22 has an upper biasing spring 31 (corresponding to an “urging member” in the claims), one end of which is fixed to the operation rod 20, and the engagement member 27 is moved to the front side ( It is biased so as to be positioned at a neutral position directed toward the front side of the work table 12 described above.

  The lower grip 23 is rotatably attached to the operation rod 20 so as to surround the outer side of the upper grip 22. The lower grip 23 is provided with C-shaped protrusions on the inner peripheral surface side thereof, and both end faces 23a and 23b of the protrusion are opposed to each other at a predetermined angle in the circumferential direction. The engaging surfaces are 23a and 23b, respectively. The lower grip 23 is connected between the both end faces 23a and 23b of the projection by a lower biasing spring 32 (corresponding to a “biasing member” in the claims) having one end fixed to the operation rod 20. Is biased so as to be positioned at a neutral position directed to the front side (the front side of the work table 12 described above).

  Further, each of the engagement surfaces 23a and 23b can be engaged with the engagement member 27 on the upper grip 22 side in the rotation direction, and the angle thereof is a front direction line L0 directed to the front. That is, with respect to the upper grip direction line L1 directed by the engaging member 27 in the neutral position, the left rotation direction is “−Δθ” and the right rotation direction is “+ Δθ”. The rotation ranges of the angles “−Δθ” and “+ Δθ” are “play” in the left-right direction starting from the front direction line L0. In this case, the front direction line L0 coincides with the upper grip direction line L1 directed by the engaging member 27 in the neutral position.

  The operation in the case where the operation lever device X is operated using the grip 21 configured as described above is as follows.

A: Rotation of the upper grip 22 within the play range When the upper grip 22 rotates within the play range, for example, there is no intention to turn the telescopic boom 7, and the telescopic boom 7 is raised or lowered. When the operation rod 20 is tilted in the front-rear direction or the left-right direction to extend or contract, even if the upper grip 22 is rotated due to the influence of the operation posture, the rotation angle is within the play range. In this case, even if the upper grip 22 is rotated, the engaging member 27 of the upper grip 22 does not engage with the engaging surfaces 23a and 23b of the lower grip 23. The grip 23 is not rotated, and therefore, an erroneous rotation operation detection signal is not output, and only the up-and-down or expansion operation of the telescopic boom 7 is performed. Secured.

  In this case, the tilting operation of the operating rod 20 is performed under the condition that the pushing member 26 of the enable switch 24 is pushed. However, as described above, the upper grip 22 is rotated within the play range. However, since an erroneous rotation operation detection signal is not output, it is not necessary to worry about the rotation of the upper grip 22 caused by wrist twist during the operation, and thus the push-in action of the enable switch 24 is continued. Therefore, during the operation, the push-in action of the enable switch 24 is erroneously released, and accordingly, a situation in which all the operations of the aerial work vehicle Z are interrupted is possible. This also prevents operational reliability.

B: When the telescopic boom 7 is turned by operating the upper grip 22 When the telescopic boom 7 is turned by operating the upper grip 22, the push member 26 of the enable switch 24 is pushed in and the grip 21 is Grab the upper grip 22 and rotate it in the required direction. In this case, the engagement member 27 of the upper grip 22 engages with the lower grip 23 in a range where the rotation amount of the upper grip 22 does not exceed the play range, that is, the angle “+ Δθ” or “−Δθ”. The lower grip 23 is not rotated because it is not engaged with the surface 23a or the engagement surface 23b. However, when the upper grip 22 is further rotated beyond the play range, as shown in FIG. The engaging member 27 of the upper grip 22 is engaged with the engaging surface 23 a or the engaging surface 23 b of the lower grip 23, and the lower grip 23 is pushed by the engaging member 27 of the upper grip 22. A rotation operation detection signal corresponding to the rotation direction and the rotation amount of the upper grip 22 is output to the control means. Upon receiving the control signal from the control means, the rotation drive device is rotated. 6 is operated, the telescopic boom 7 is driven swivel. That is, the telescopic boom 7 can be driven to rotate only by pushing the enable switch 24 and rotating the upper grip 22 without rotating the lower grip 23.

  In this case, the turning operation of the upper grip 22 of the grip 21 is performed while pressing the pushing member 26 of the enable switch 24. At this time, the lower grip 23 is further moved by a hand holding the upper grip 22. Therefore, it is easy to continue the push-in action of the enable switch 24. Therefore, the push-in action of the enable switch 24 is erroneously released during the operation, and accordingly, the push-in action of the enable switch 24 is increased. Occurrence of a situation in which all operations of the work vehicle Z are interrupted is prevented as much as possible, and this ensures work reliability.

C: When the telescopic boom 7 is turned by the single operation of the lower grip 23 When the telescopic boom 7 is turned by the single operation of the lower grip 23, the enable is performed while the upper grip 22 of the grip 21 is held. While pushing the pushing member 26 of the switch 24, the lower grip 23 is rotated in the required direction by the thumb 122. Then, along with the rotation of the lower grip 23, a rotation operation detection signal corresponding to the rotation direction and the rotation amount is output to the control means, and receives the control signal from the control means and receives the control signal from the rotation drive device 6 described above. Is activated, and the telescopic boom 7 is driven to turn.

  That is, the telescopic boom 7 can be driven to rotate by directly rotating only the lower grip 23 without rotating the upper grip 22 while the enable switch 24 is pushed in. Thus, the fine movement operation of the lower grip 23, that is, the fine turning operation of the telescopic boom 7 can be performed.

  In this case, when the lower grip 23 is rotated, the upper grip 22 may be rotated depending on the degree of twisting of the wrist or the like. As long as it is within the play range, there is no problem in the turning drive of the telescopic boom 7 by the rotation of the lower grip 23.

  According to the operation lever device X of this embodiment, the following specific effects can be obtained.

  (1) In this operation lever device X, since the predetermined play in the rotation direction is provided between the upper grip 22 and the lower grip 23, the lever operation is performed by grasping the upper grip 22 In addition, for example, even if the upper grip 22 is slightly rotated due to a wrist twist or the like due to an operation in an unreasonable posture, as long as the rotation amount is within the range of play, the effect of the rotation of the upper grip 22 is affected. Does not reach the lower grip 23, and accordingly, the rotation operation detection signal is not erroneously output from the third potentiometer 108, and the reliability of the operation is ensured.

  (2) When the upper grip 22 is rotated beyond the play range, the lower grip 23 is rotated by the upper grip 22 and a rotation operation detection signal is output from the third potentiometer 108. By turning the upper grip 22 while pushing the enable switch 24, the lower grip 23 can be turned to output a turning operation detection signal. Therefore, for example, as compared with a configuration in which a rotation operation detection signal is output for the first time by holding the upper grip 22 and pushing the enable switch 24 and further rotating the lower grip 23, Since the number of operation items that need to be operated at the same time is reduced, the degree of twisting of the wrist or the like during the operation is reduced, and the fatigue of the hand is reduced. Therefore, the push operation of the enable switch 24 can be continued. It becomes easy. As a result, erroneous operation stop of the aerial work vehicle Z due to inadvertent release of the push-in operation of the enable switch 24 during the operation is avoided, and highly reliable work is realized.

  (3) Within the play range, only the lower grip 23 can be independently rotated separately from the upper grip 22 while the palm is placed on the upper grip 22, so that the lower Although the grip 23 can be slightly rotated, the telescopic boom 7 can be finely operated, and the lower grip 23 is rotated in conjunction with the rotation of the upper grip 22. The fine movement operability of the turning motion of the telescopic boom 7 is ensured.

  (4) As a structure for ensuring play between the upper grip 22 and the lower grip 23, the lower grip 23 is provided with a pair of engaging surfaces 23a and 23b facing each other at a predetermined angle in the rotational direction. On the other hand, the upper grip 22 is provided with an engaging member 27 that selectively engages with the pair of engaging surfaces 23a and 23b of the lower grip 23 in the rotating direction to rotate the lower grip 23. A simple and inexpensive configuration is provided, and an area where the engaging member 27 does not engage with the pair of engaging surfaces 23a and 23b of the lower grip 23 in the rotation direction of the upper grip 22 is ensured. By adopting such a configuration, the cost of the operation lever device X can be reduced.

(5) Since the engaging member 27 provided on the upper grip 22 is formed integrally with the upper grip 22, when the upper grip 22 exceeds the play range, the upper grip 22 is further changed. As the rotation of the lower grip 23 starts immediately, the response of the lower grip 23, and hence the response of the turning movement of the telescopic boom 7, is improved. The positioning accuracy of the boom 7 in the turning direction is improved, and the work accuracy is ensured.
(6) Since the enable switch 24 is provided on the upper grip 22 of the grip 21, the operator can push the enable switch 24 without difficulty at the same time as holding the upper grip 22. As a result, it is possible to cause a situation in which the operation of the telescopic boom 7 is inadvertently stopped due to the finger separating from the pushing member 26 of the enable switch 24 during the operation. Therefore, operational reliability is further enhanced.

In this embodiment, the engaging member 27 is formed on the upper grip 22 side, and the engaging surfaces 23a and 23b are formed on the lower grip 23 side. However, the present invention is limited to such a configuration. Instead, for example, the engaging surfaces 23a and 23b can be formed on the upper grip 22 side, and the engaging member 27 can be formed on the lower grip 23 side.
II: Second Embodiment FIG. 4 schematically shows the structure of the grip 21 provided in the operating lever device X according to the second embodiment of the present invention.

  Similar to the grip 21 in the first embodiment, the grip 21 of the operation lever device X has an upper and lower two-stage structure including an upper grip 22 and a lower grip 23, and the basic structure is the first structure. The same as the upper grip 22 and the lower grip 23 in this embodiment. Accordingly, here, the same members as those shown in FIG. Only the configuration specific to the grip 21 of this embodiment will be described in detail.

  As described above, the grip 21 according to the second embodiment has a two-stage structure composed of an upper grip 22 and a lower grip 23, both of which rotate around the operation rod 20 as a rotation center. Further, the engaging member 27 is provided on the upper grip 22 side, and the engaging surfaces 23a and 23b are provided on the lower grip 23 side, respectively. However, the structure of the engaging member 27 is different from that of the first embodiment.

  That is, in this embodiment, the engaging member 27 is not formed integrally with the upper grip 22 as in the first embodiment, but the engaging member 27 is attached to the operating rod 20. The engagement member 27 is urged by a pair of left and right engagement member urging springs 33 and 34 so that the engagement member 27 always maintains a neutral position directed to the front.

  The operation of the grip 21 thus configured is as follows.

A: Rotation of the upper grip 22 within the play range When the upper grip 22 rotates within the play range between the engagement surfaces 23a, 23b of the lower grip 23, that is, the telescopic boom 7 When the operating rod 20 is tilted in the front-rear direction or the left-right direction in order to raise or lower the telescopic boom 7, the upper grip 22 is rotated due to the influence of the operating posture or the like. If the rotation angle is within the play range, even if the upper grip 22 is rotated, the engagement member 27 of the upper grip 22 is engaged with the engagement surface of the lower grip 23. 23a and 23b are not engaged, the lower grip 23 is not rotated, so that an erroneous rotation operation detection signal is not output, and the telescopic boom 7 is raised and lowered. Or, only the expansion and contraction operation is performed, and work reliability is ensured.

  In this case, the tilting operation of the operating rod 20 is performed under the condition that the pushing member 26 of the enable switch 24 is pushed. However, as described above, the upper grip 22 is rotated within the play range. However, since an erroneous rotation operation detection signal is not output, it is not necessary to worry about the rotation of the upper grip 22 caused by wrist twist during the operation, and thus the push-in action of the enable switch 24 is continued. Therefore, during the operation, the push-in action of the enable switch 24 is erroneously released, and accordingly, a situation in which all the operations of the aerial work vehicle Z are interrupted is possible. This also prevents operational reliability.

B: When the telescopic boom 7 is turned by operating the upper grip 22 When the telescopic boom 7 is turned by operating the upper grip 22, the push member 26 of the enable switch 24 is pushed in and the grip 21 is Grab the upper grip 22 and rotate it in the required direction. In this case, as the upper grip 22 is rotated, the engagement member 27 is also rotationally displaced by the engagement member biasing springs 33 and 34 while maintaining the relative position to the upper grip 22. In the region where the rotation amount of the upper grip 22 does not exceed the play range, that is, the angle “+ Δθ” or “−Δθ”, the engagement member 27 is engaged with the engagement surface 23 a or the engagement surface 23 b of the lower grip 23. Since they do not match, the lower grip 23 is not rotated.

  However, when the upper grip 22 is further rotated beyond the play range, as shown in FIG. 5, the above-mentioned engagement that rotates integrally with the upper grip 22 while maintaining the relative position to the upper grip 22 is maintained. The joint member 27 engages with the engagement surface 23a or the engagement surface 23b of the lower grip 23, and the lower grip 23 is elastically supported on the upper grip 22 side by the first engagement member biasing spring 33. The upper grip 22 is rotated integrally with the upper grip 22 while being pushed by the engagement member 27, and a rotation operation detection signal corresponding to the rotation direction and the rotation amount is output to the control means. In response to the signal, the turning drive device 6 operates, and the telescopic boom 7 is driven to turn.

  That is, the telescopic boom 7 can be driven to rotate only by pushing the enable switch 24 and rotating the upper grip 22 without rotating the lower grip 23.

  In this case, even if the amount of rotation of the upper grip 22 exceeds the range of play and the engagement member 27 is engaged with the engagement surface 23b, the lower grip 23 is not immediately rotated. Due to the elasticity of the first engagement member biasing spring 33, the lower grip 23 starts to rotate with a time shift, and a rotation operation detection signal is output. In addition, when the engagement member 27 and the engagement surface 23b are engaged, the rotation resistance of the upper grip 22 is increased by the addition of the elastic force of the first engagement member urging spring 33. Can be easily recognized. As a result, for example, the turning motion of the telescopic boom 7 can be gradually accelerated by reducing the operating force with respect to the upper grip 22, and a highly safe operation with less actuation shock is possible.

  Further, the turning operation of the upper grip 22 is performed while pushing the pushing member 26 of the enable switch 24. At this time, the lower grip 23 is further turned by the hand holding the upper grip 22. Since it is not necessary, it is easy to continue the pushing action of the enable switch 24. Therefore, the pushing action of the enable switch 24 is erroneously canceled during the operation, and accordingly, the work vehicle Z of the aerial work platform Z is released. Occurrence of a situation where all operations are interrupted is prevented as much as possible, and this also ensures work reliability.

C: When the telescopic boom 7 is turned by the single operation of the lower grip 23 When the telescopic boom 7 is turned by the single operation of the lower grip 23, the enable is performed while the upper grip 22 of the grip 21 is held. While pushing the pushing member 26 of the switch 24, the lower grip 23 is rotated in the required direction by the thumb 122. Then, as shown in FIG. 6, with the rotation of the lower grip 23, a rotation operation detection signal corresponding to the rotation direction and the rotation amount is output to the control means, and the control signal from the control means is received. In response, the turning drive device 6 operates, and the telescopic boom 7 is turned.

  That is, the telescopic boom 7 can be driven to rotate by directly rotating only the lower grip 23 without rotating the upper grip 22 while the enable switch 24 is pushed in. Thus, the fine movement operation of the lower grip 23, that is, the fine movement operation of the telescopic boom 7 can be performed.

  In this case, as shown in FIG. 6, the engagement member 27 engages with the engagement surface 23 a of the lower grip 23. Therefore, if the engaging member 27 is formed integrally with the upper grip 22, the upper grip 22 is rotated with the rotation of the lower grip 23. However, in this embodiment, the engaging member 27 is elastically supported by the second engaging member urging spring 34, and the upper grip 22 is subjected to a rotation restricting action by an operator's gripping force. Even if the engaging member 27 engages with the engaging surface 23a of the lower grip 23, the upper grip 22 does not rotate. Therefore, it is possible to reliably prevent the finger that pushes the enable switch 24 away from the enable switch 24, and the reliability of work performed using the operation lever device X is improved.

D: Other turning operations In FIG. 7, as an example of turning operations other than the above A to C, the grip 21 is first moved leftward from the neutral state shown in FIG. After turning, only the lower grip 23 is turned to the right and the telescopic boom 7 is turned.

In this case, even if the engagement member 27 is rotated along with the rotation of the lower grip 23, the upper grip 22 is rotated by the reduction deformation of the first engagement member urging spring 33. Therefore, the finger that pushes it in from the enable switch 24 is prevented from being separated, and the reliability of work performed using the operation lever device X is ensured.
E: Effects In the operating lever device X according to the second embodiment, the basic effects similar to those of the first embodiment can be obtained in addition to the above-described specific effects. For the effect, the corresponding explanation in the first embodiment is used, and the explanation here is omitted.
III: Others (1) Setting the play amount between the upper grip 22 and the lower grip 23 The play amount between the upper grip 22 and the lower grip 23 is not necessarily set to a constant value, and the importance of the operation mode Can be set as appropriate.

  That is, as shown in FIG. 8, when the operation form in which the lower grip 23 is indirectly rotated through the rotation operation of the upper grip 22 is regarded as important, characteristic lines L1a and L1b are shown in FIG. When a relatively large play “Δθ1” is set as described above and importance is attached to the scanning form in which the lower grip 23 is directly rotated, the relatively large play is indicated by characteristic lines L2a and L2b in FIG. Setting to “Δθ2” is also conceivable.

The former setting takes into consideration the case where the upper grip 22 is easily turned unintentionally due to conditions such as the working posture. In addition, the latter setting is in consideration of securing fine operability of the lower grip 23.
(2) Differences from the grip with an integral structure As described above, the grip 21 employed in the operating lever device X according to the present invention has a two-stage structure including an upper grip 22 and a lower grip 23, and these A “play” in the direction of rotation is provided between the two. According to such a configuration, it is possible that the above-mentioned “play” causes the push-in action to the enable switch 24 to be canceled accidentally during operation due to twisting of the wrist during grip operation, and the work machine is unexpectedly stopped. In addition, the “play” is not involved in the rotating operation of the lower grip 23 at the time of the single operation of the lower grip 23. Therefore, the fine movement operability at the time of the single operation of the lower grip 23 is ensured. Is.

  On the other hand, it is also conceivable to make the grip an integral structure without having a two-stage upper and lower structure, and to provide “play” in the rotational direction between the grip and the operating rod. However, according to such a configuration, since “play” is always involved when the grip is operated, it is difficult to ensure fine operability. Therefore, this one-piece grip is greatly different from the grip 21 having the upper and lower two-stage structure according to the present invention in terms of its function and effect, and cannot be identified.

1 ·· Vehicle 2 ·· Body 3 · · Wheel 4 · · Outrigger 5 · · Turntable 6 · · Swiveling drive 7 · · Telescopic boom 8 · · Hoisting cylinder 9 · · Telescopic cylinder 10 · · Posture maintenance member 11 · -Swing drive device 12-Work table 20-Operation rod 21-Grip 22-Upper grip 23-Lower grip 24-Enable switch (switch means)
25 ·· Body 26 ·· Pushing member 27 · · Engaging member 31 · · Upper biasing spring 32 · · Lower biasing spring 33 · · Engaging member biasing spring 34 · · Engaging member biasing Spring X ... Operation lever device Z ...

Claims (4)

A base, an operating rod having an operating rod base end attached to the base so as to be tiltable in two orthogonal directions, a grip provided at the tip of the operating rod, and the tilting direction and tilt of the operating rod A tilting operation detection signal output means for detecting a tilting amount and outputting a tilting operation detection signal corresponding to the tilting direction and the tilting amount; and detecting the pivoting direction and the pivoting amount of the grip to determine the pivoting direction and the pivoting amount. A rotation operation detection signal output means for outputting a corresponding rotation operation detection signal; a control means for receiving a signal from the tilt operation detection signal output means and the rotation operation detection signal output means and outputting a control signal; An operation lever device of a work machine provided with a switch unit that is provided on the grip and outputs a push operation detection signal by allowing a push operation to be performed and allows a control signal to be output from the control unit,
The grip includes an upper grip and a lower grip that are provided coaxially and are relatively rotatable, and is configured such that the rotation operation detection signal output means is activated by a rotation operation of the lower grip. on the other hand,
A predetermined play in the rotational direction is provided between the upper grip and the lower grip, and when the upper grip is rotated to the left and right sides beyond the play range, the lower grip is moved to the left and right by the upper grip. is rotated to the side working machine, characterized in that it is configured to rotate the operation detection signal to the right and left sides corresponding to the respective grip rotating direction from the rotation operation detection signal output means is output Control lever device. In claim 1,
A pair of engagement surfaces are provided on either one of the upper grip and the lower grip of the grip so as to face each other at a predetermined angle in the rotation direction, while on the other side of the upper grip and the lower grip. Is provided with an engaging member that selectively engages with the pair of engaging surfaces in the rotating direction. In claim 2,
The engaging member is configured integrally with either the upper grip or the lower grip, or is relatively rotatable with respect to either the upper grip or the lower grip, and the operating force An operating lever device for a working machine, wherein the rotating position is held at a neutral position by an urging means in a state in which is released. In claim 1, 2 or 3,
An operating lever device for a working machine, wherein the switch means is provided on the upper grip of the grip.

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