JP2007131429A - Turning position detection mechanism of working bench in boom type working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact turning position detection mechanism of a working bench capable of achieving maintenance work at low cost and increasing its reliability for a long time. <P>SOLUTION: This turning position detection mechanism 50 is provided with a swing supporting member 6 in which swing of a vertical post part 6a at an upper end is controlled so as to hold vertical attitude always irrespective of a derricking angle of a boom 5 in a tip part of the boom 5 arranged so as to derrick and move for a vehicle body freely, the working bench 8 turnably supported through a working bench bracket 7 connected pivotally with the vertical post part 6a, and a rotation position detection means composed of a detection switch and a dog for detecting a rotation angle position of the working bench bracket 7 for the vertical post part 6a. The rotation position detection means is arranged in a top surface region of a cylindrical part 7a of the working bench bracket in a pivotal connection part of the vertical post part and the working bench bracket 7. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes a boom that can freely move up and down with respect to the vehicle body, and a workbench that is disposed at the tip of the boom so as to be capable of swiveling. The present invention relates to a turning position detecting mechanism of a work table in a boom type aerial work vehicle that performs the above-described operation.

  The boom type aerial work vehicle as described above is generally configured based on a truck chassis, and a boom capable of turning, raising and lowering, extending and contracting at the rear of the vehicle body, and a boom at the tip of the boom. A work table arranged so as to be capable of swiveling, and an operator on the work table operates the boom to move the work table to a desired high position, and further, the work table is moved against the boom. It is configured to be able to work by horizontally turning. Since the work platform is a place where workers can board and work, the floor surface must always be horizontal regardless of the boom undulation angle, and is always horizontal regardless of the pivot angle position of the work platform with respect to the boom. Need to hold. For this reason, it has a vertical post part at the tip of the boom and is arranged so as to be swingable along the boom undulation angle plane so that the vertical post part always maintains a vertical posture regardless of the boom undulation angle. The work table is supported so as to be pivotable around the vertical post portion via a supported member pivoted to the vertical post portion. Therefore, the floor surface of the workbench is always kept horizontal regardless of the boom undulation angle and the swivel angle position of the workbench, and an operator on the workbench operates the boom operation device provided on the workbench to operate the boom. Is configured to be able to work comfortably at a desired height by turning, moving up and down, extending and contracting, and horizontally turning the work table with respect to the boom.

  Here, if horizontal turning of the worktable with respect to the boom is permitted without any limitation, a situation in which the worktable and the tip of the boom interfere with each other may occur depending on the turning angle position of the worktable. In particular, in an aerial work vehicle using an electric motor as a drive source for horizontally turning the work table, there is a risk of damaging the motor when power supply to the motor is continued in the interference state. Therefore, a boom type aerial work is provided which is provided with a turning position detection mechanism for detecting the turning angle position of the work table with respect to the boom, and which controls the operation of the motor based on the detection signal from the rotation position detecting means in this detection mechanism. There is a car. As a work table turning position detection mechanism used for such applications, for example, a dog is provided at a predetermined angular position on the outer periphery of the vertical post portion, and a limit switch for detecting the position of the dog is provided on the work table side. An output shaft of a motor in which a limit switch detects a dog when it is horizontally turned to a certain angular position (see, for example, Patent Document 1), and a motor that rotates a work table with respect to a vertical post portion. The thing of the form comprised so that a rotation angle position of this may be detected with a potentiometer (for example, refer patent document 2) etc. are known.

Japanese Utility Model Publication No. 6-83697 (Figs. 4 and 5) Japanese Utility Model Publication No. 1-83729 (FIG. 1)

  However, for example, in the conventional turning position detecting mechanism as described in Patent Document 1, a member to be detected such as a dog is provided on the outer periphery of the vertical post portion, and a detector such as a limit switch is provided on the vertical post portion. Adjacent to the work table side member (for example, a work table bracket or a supported member such as a swing arm connecting the vertical post portion and the work table). For this reason, the swivel position detection mechanism becomes large as a whole due to the distributed arrangement of the detector and the member to be detected, and the detector and the member to be detected are arranged facing each other. There was a problem that it was difficult to do.

  Further, in the conventional work table swivel position detection mechanism, the detector for detecting the swivel angle position of the work table is attached outside the cylindrical part of the work table side member that covers the outer periphery of the vertical post part. The swinging radius swung with the turning motion of the detector increased, and the detector and its signal line were swung at a moving distance proportional to the swinging radius. The fact that the detector is provided on the work table side means that electric parts such as limit switches, potentiometers, and proximity switches that are generally used as detectors vibrate each time the work table is swung. In addition to being required to be improved in terms of the use environment, improvements were also required from the viewpoint of cost increase due to the use of electrical components with improved earthquake resistance.

  Furthermore, in order to protect the detector and the member to be detected from raindrops, dust, fallen objects, etc., a large cover that covers the detector located on the outer peripheral side of the vertical post portion when it is intended to provide a cover that covers them. If the sensor signal line is required to be protected from falling objects and pinching, the cover will be further enlarged, increasing the production cost, and the swivel angle range of the workbench will be the thickness of the cover. There was a problem that it was narrowed by that amount.

  The present invention has been made in view of the circumstances as described above, and can perform maintenance work and the like easily while maintaining a small size and low cost. It is an object of the present invention to provide a turning position detecting mechanism for a work table with improved performance.

  In order to achieve the above object, the present invention provides a boom that can freely move up and down with respect to the vehicle body, and a vertical post portion that is integrated with the boom at the angle of the boom. A swing support member that is movably disposed and swings so that the vertical post portion always maintains a vertical posture regardless of the boom undulation angle, and a supported member that is pivotally connected to the vertical post portion ( For example, a work table supported so as to be pivotable with respect to the vertical post portion via the work table bracket 7) in the embodiment, and a rotation position detecting means for detecting the rotation angle position of the holding member with respect to the vertical post portion ( For example, the rotation position detection means comprising the detection switch 51 and the dog 55 in the embodiment), and this rotation position detection means covers the outer periphery of the vertical post portion and is pivotally connected to the vertical post portion. Cylindrical part (for example, To be disposed on the upper surface region of the post sleeve 7a) in facilities embodiment constitutes a workbench pivoted position detecting mechanism in boom type working vehicle.

  The rotational position detection means detects the rotational angle position of the supported member with respect to the vertical post portion by detecting the position of the detected member (for example, the dog 55 in the embodiment) and the detected member. For example, the detection switch 51) in the embodiment, the detected member is provided on one of the vertical post portion side and the cylindrical portion side in the pivotal portion of the vertical post portion and the cylindrical portion, and the detector It is preferable that the pivot position detecting mechanism of the work table is configured to be provided on the other side of the pivoting portion.

  The detector has a signal line for outputting a detection signal, the vertical post portion has a communication hole penetrating the vertical post portion up and down, and the detector is disposed at the upper end portion of the vertical post portion. Rotating the work table so that the detected member is disposed at the upper end of the holding member covering the outer periphery of the vertical post portion, and the signal line of the detector is led out to the lower portion of the vertical post portion through the communication hole It is preferable to constitute a position detection mechanism.

  In addition, it is desirable to detachably provide a cover member that covers the upper surfaces of the vertical post portion and the cylindrical portion.

  In the swivel position detecting mechanism of the work table according to the present invention, the rotation position detecting means for detecting the rotation angle position of the holding member with respect to the vertical post portion covers the outer periphery of the vertical post portion and is pivotally connected to the vertical post portion. It is arrange | positioned in the upper surface area | region of the cylindrical part (for example, post sleeve 7a in embodiment) of a holding member. For this reason, the entire mechanism can be made compact by concentrating the turning position detection mechanism in the upper surface region of the cylindrical portion. In addition, since the rotational position detecting means can be approached from above the pivoting portion, maintenance work such as attaching / detaching replacement of the rotational position detecting means and position adjustment can be easily performed.

  Further, the rotational position detecting means is composed of a member to be detected and a detector for detecting the rotational angle position of the supported member with respect to the vertical post portion by detecting the position of the detected member. The member is provided on either the vertical post part side or the cylindrical part side in the pivotal part of the vertical post part and the cylindrical part, and the detector is provided on the other side in the pivotal part. For this reason, for example, when the member to be detected is provided on the cylindrical part side and the detector is provided on the vertical post part side, the vertical post part on which the detector moves relatively and the vertical post part on the fixed side of the supported member Therefore, the detector is not swung every time the work table is swung. Therefore, it is possible to improve the long-term reliability by improving the installation environment of the detector, and it is not always necessary to use expensive earthquake-resistant parts, so that the cost can be reduced. Even when the detector is disposed on the cylindrical portion side, the range of movement of the detector is limited to the upper surface area of the cylindrical portion, so that the moving distance can be extremely small, and the reliability Can be improved.

  In addition, a vertical through hole is provided in the vertical post portion, the detector is disposed at the upper end portion of the vertical post portion, and the detected member is disposed at the upper end portion of the holding member that covers the outer periphery of the vertical post portion. According to the configuration in which the signal line of the detector is led out to the lower part of the vertical post part through the communication hole, the signal line in the case of using the wired form detector is led out through the inside of the vertical post part. Therefore, the signal line is completely protected from falling objects and pinching. When a cover member is provided to protect the detector and the member to be detected from raindrops, dust, fallen objects, etc., the cover member may be a small cover with a diameter of a cylindrical part covering the outer periphery of the vertical post, and this cover Since the member can also be used as a signal line cover, by providing a large cover member in the past, the swivel angle range of the work table that has been narrowed by the mounting thickness of the cover member can be expanded.

  According to the configuration in which the cover member that covers the upper surface of the vertical post portion and the cylindrical portion is detachable, the rotational position detecting means is a raindrop, dust, fallen object, etc. with a small cover (cap) about the diameter of the cylindrical portion. Since the cover member is configured to be detachable and removable, the cover member can be removed to easily perform maintenance work such as attachment / detachment replacement and position adjustment of the rotational position detecting means with the upper surface opened. be able to.

  Therefore, according to the present invention, a rotating position detection mechanism for a work table that can easily perform maintenance work and the like with a small and low-cost configuration, and has improved long-term reliability by improving the installation environment of the detector. Can be provided.

  Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 6 shows a boom type aerial work vehicle equipped with a turning position detecting mechanism for a workbench according to the present invention, and FIG. 1 shows a partially enlarged view of a boom tip portion of the aerial work vehicle 1. A schematic configuration of the aerial work vehicle 1 will be described with reference to the drawings.

  The aerial work vehicle 1 has a driving cabin in front of the vehicle body 2 and is configured based on a truck chassis that can travel on the front and rear wheels 3f and 3r. On the vehicle body 2 behind the driving cabin, a swivel base 4 is mounted so as to be able to swivel horizontally and is pivoted by a swivel motor 21 provided on the lower side of the swivel base 4. A boom 5 is pivotably connected to the upper part of the swivel base 4 so as to be able to rise and fall, and is moved up and down by a hoisting cylinder 22 stretched between the swivel base 4 and the boom 5. The boom 5 is configured such that a base end boom 5a, an intermediate boom 5b, and a distal end boom 5c are combined in a telescopic manner so that the boom 5 can be expanded and contracted.

  A swing support member 6 is attached to the front end portion of the front end boom 5c so as to swing up and down along the undulation angle surface of the boom 5. The swing support member 6 is integrally formed with a vertical post portion 6a protruding upward, and by a leveling cylinder 24 disposed between the lower end portion of the swing support member 6 and the tip boom 5c. The swing control is performed, and the leveling control is performed so that the vertical post portion 6a always maintains the vertical posture regardless of whether the boom 5 is raised or lowered.

  The work table 8 is supported by the vertical post portion 6a, which is always maintained in a vertical posture, through the work table bracket 7 so as to be able to turn horizontally. The worktable bracket 7 includes a post sleeve 7a that covers the outer periphery of the vertical post portion 6a, and an arm portion 7b that extends from the post sleeve 7a in the outer peripheral direction of the cylinder and is connected to the worktable 8, and is perpendicular to the arm portion 7b. The work table 8 is swung around the vertical post portion 6a by the work table turning mechanism 25 provided between the post unit 6a (the turning action of the work table 8 is referred to as swinging because the work table 8 is distinguished from the turning of the turn table 4). Driven.)

  As shown in FIG. 2, the worktable turning mechanism 25 includes a worm wheel 25 w fixed to the vertical post portion 6 a and a worm (not shown) that meshes with the worm wheel 25 w, with the cover covering the mechanism removed. The swinging motor 25m has a swing motor 25m attached to the lower portion of the arm portion 7b, and the operation of the swing motor 25m is controlled so that the work table 8 swings left and right around the vertical post portion 6a. It is possible to move. In the present embodiment, a configuration example using an electric motor as the swing motor 25m is shown.

  A boom operating device 10 is provided on the work table 8. The boom operation device 10 is provided with an operation lever, various operation switches, and the like that perform operation operations such as a turning operation of the turntable 4, a raising and lowering and extending operation of the boom 5, and a swinging operation of the work table 8. On the other hand, the vehicle body 2 is provided with a control unit 30 that receives an operation signal from the boom operation device 10 and controls the operation of actuators such as the swing motor 21, the hoisting cylinder 22, the telescopic cylinder 23, and the swing motor 25m. The control unit 30 controls the operation of each actuator based on the operation signal input from the boom operation device 10. For this reason, in the aerial work vehicle 1, an operator who has boarded the work table 8 operates the boom operation device 10 to turn the swivel 4, raise and lower the boom 5, extend and retract, and swing the work table 8. The work table 8 can be moved to a desired high position and the work can be performed. Outrigger jacks 28, 28,... Are provided on the front, rear, left, and right sides of the vehicle body 2 to lift and stably support the vehicle body 2 so that the vehicle body does not become unstable when the work table 8 is moved to a high place. Note that an upper control unit may be provided on the work table side so that the upper control unit performs peripheral control of the work table such as operation control of the swing motor 25m.

  In the aerial work vehicle 1 configured as described above, the interference between the work table 8 and the boom 5 is prevented, and the swing motor 25m is moved in a state where the swing motion of the work table 8 is mechanically suppressed. In order to prevent the motor from being damaged due to the continued power supply, a turning position detection mechanism 50 for detecting the turning angle position of the work table 8 with respect to the boom 5 is provided. Hereinafter, the turning position detection mechanism 50 will be described with reference to FIGS.

  FIG. 3 shows a plan view of the turning position detection mechanism 50 with the upper end post cover 78 removed. FIG. 4 shows a sectional view of the main part of the detection mechanism 50 as shown in FIG. It is disposed in the upper surface region of the pivotal portion between the portion 6a and the worktable bracket 7.

  The vertical post portion 6a has a communication hole 61 penetrating vertically at the center and has a cylindrical pipe shape. The above-described worm wheel 25w is fastened and fixed to the end plate 62 welded to the outer periphery of the upper and lower intermediate portions by bolts 63. ing. On the other hand, the post sleeve 7a of the worktable bracket 7 has a hollow cylindrical shape that covers the outer periphery of the vertical post portion 6a, and a bearing housing that holds the outer ring of the bearing 71 is formed above and below the inner peripheral portion of the cylinder. Is provided with a worm housing 72 for accommodating the worm described above.

  The worktable bracket 7 is pivotally connected to the vertical post portion 6a via upper and lower two-stage bearings 71, 71 fitted to the bearing housing, and is attached to the vicinity of the upper end of the vertical post portion 6a. To prevent it from coming off. The upper end corner portion of the vertical post portion 6a is chamfered in a tapered shape, and a T-shaped sensor bracket 65 in plan view, which forms a mounting surface of the detection switch by closing a part of the communication hole 61, is fixed to the upper end surface. Yes.

  The post sleeve 7a is formed to extend somewhat above the upper end position of the vertical post portion 6a, and a dog bracket 75 is attached to the post sleeve 7a. The dog bracket 75 is an oval plate whose outer shape in plan view matches the inner diameter of the upper end portion of the post sleeve 7a, and a circular hole that exposes the upper end portion of the vertical post portion 6a is formed in the center. The dog bracket 75 is attached with two ears bent upwardly fixed to the inner peripheral surface of the post sleeve 7a by bolts 76, and the upper surface of the substantially annular plate is substantially the same as the upper end surface of the vertical post portion 6a. Arranged at height.

  As a result, a rotational position detection space S that is surrounded by the outer peripheral wall surface of the upper end portion of the post sleeve 7a and is recessed in a sectional view is formed at the upper portion of the vertical post portion 6a and the pivot portion of the worktable bracket 7. In this rotational position detection space S, the sensor bracket 65 on the vertical post side and the dog bracket 75 on the worktable bracket side are arranged side by side on the inner and outer circumferences at substantially the same height surface. A turning position detecting means for detecting a rotational angle position of the worktable bracket 7 with respect to the portion 6a is provided. The upper end height of the post sleeve 7a is substantially the same as the upper end height of the vertical post portion 6a, a dog bracket is fixed to the upper end surface of the post sleeve, and a cap-like post cover is fitted above the post bracket 7a. A rotational position detection space similar to the above may be formed inside.

  The turning position detecting means includes a detection switch 51 (51R, 51L) attached to the sensor bracket 65 and a dog 55 (55R, 55L) attached to the dog bracket 75. The detection switch 51 determines the position of the dog 55. By detecting, it is comprised so that the rotation angle position of the worktable bracket 7 with respect to the vertical post part 6a may be detected.

  In the present embodiment, the rotation angle position of the worktable bracket 7 with respect to the vertical post portion 6a to be detected, that is, the swing angle position of the worktable 8 with respect to the boom 5 corresponds to the swinging direction of the worktable 8 to the left and right. The right end detection switch 51R and the right end dog 55R for detecting the end position when the turning direction of the work table 8 in the plan view is the right direction (counterclockwise), and a plan view in the plan view. This is composed of a left end detection switch 51L and a left end dog 55L for detecting a terminal position when the turning direction of the work table 8 is the left direction (clockwise).

  The detection switches 51R and 51L exemplify an embodiment using a limit switch. The detection arm of the limit switch extends from the inner sensor bracket 65 side toward the outer dog bracket 75, and the detection roller at the tip of the arm is a dog. Arranged above the bracket 75. The radial positions of the detection switches and the dogs are set based on the relative positional relationship between the boom 5 and the workbench 8, and the angular position before the workbench 8 interferes with the boom 5, for example, 5 It is set so that the switch contact of the detection switch 51 is reversed at an angular position that is a little before.

  Specifically, with the right end detection switch 51R and the right end dog 55R, the right end that rotates around the upper end of the vertical post portion 6a as the work table 8 swings in the right direction when the work table 8 is swung in the right direction. The inclined engagement surface of the dog 55R starts to engage with the detection roller of the right end detection switch 51R at an angular position about 8 degrees before the work table 8 and the boom 5 interfere, and at an angular position about 5 degrees before. Adjustment is set so that the switch contact of the right end detection switch 51R is reversed (for example, the switch contact is reversed from closed to open). The same applies to the left end detection switch 51L and the left end dog 55L.

  The signal lines 51s of the left and right detection switches 51L and 51R are bundled on the sensor bracket 65 and fixed to the T-shaped leg portion of the bracket, and the inside of the post communicates from the side of the leg portion of the sensor bracket 65. The control unit 30 is connected to the control unit 30 through the hole 61 and further through the boom 5. When the detection signal for detecting the dogs 55R and 55L is input from the detection switches 51R and 51L (for example, when the switch contact is opened), the control unit 30 rotates in the detected direction. The power supply to the swing motor 25m is cut off, and the operation of the swing motor 25m is restricted so that the work table 8 does not move further in the interference direction. On the other hand, in the state where the operation is restricted as described above, when the work table 8 is operated in a direction away from the interference direction, the control unit 30 permits the operation of the swing motor 25m toward the direction, Electric power is supplied to the swing motor 25m to move the work table 8 away from the interference area.

  A post cover 78 is fitted to the upper end of the post sleeve 7a so as to cover the rotational position detection space S, and the left and right end detection switches 51L, 51R, dog 55L, 55R and the signal line 51s are covered, and these can be protected from raindrops, dust, falling objects, and the like.

  The aerial work vehicle 1 is provided with an interference prevention mechanism 80 that mechanically prevents interference between the boom 5 and the work table 8. The interference prevention mechanism 80 includes an end plate 62 welded and fixed to the vertical post portion 6a, and left and right support plates 72L and 72R of the worm housing 72 fixed to the lower portion of the arm portion 7b by welding. The end plate 62 is formed in a convex shape with a part of a disk supporting the worm wheel 25w projecting in the outer circumferential direction, and locking surfaces 62L and 62R are formed at the left and right ends of the projecting portion. .

  The positions where the left and right locking surfaces 62L and 62R are formed are the angular positions immediately before the work table 8 interferes with the boom 5, more specifically, the dog 55 is detected by the detection switch 51 and the operation of the swing motor 25m is restricted. After the operating restriction angle is slightly exceeded, it is an angular position before the work table 8 interferes with the boom 5 and is about 2 degrees before the interference when the operating restriction angle of the swing motor 25m is 5 degrees before the interference. Is set so as to contact the side surfaces of the support plates 72L and 72R. For example, the locking surface 62R on the right side in the plan view is such that the support plate 72R that pivots around the vertical post portion 6a along with the head swing of the work table 8 in the state in which the work table 8 is swung in the right direction. It is configured to abut against the locking surface 62R at an angular position immediately before the platform 8 and the boom 5 interfere with each other and mechanically regulate so that the work table 8 does not swing to the right.

  5A and 5B, the work table 8 is moved from the state shown in FIG. 5A to show the operation of the turning position detection mechanism 50 and the interference prevention mechanism 80 when the work table is swung. When the head is swung in the right direction (counterclockwise) in plan view, the right end dog 55R that rotates around the upper end of the vertical post portion 6a before the work table 8 interferes with the boom 5 is the right end detection switch 51R. The switch contact of this detection switch 51R is reversed by engaging with the detection roller. Then, the control unit 30 that has received the detection signal from the right end detection switch 51R cuts off the power supply to the swing motor 25m in the rotational direction in which the work table 8 is swung in the right direction, and then the support that has been rotated slightly. The plate 72R comes into contact with the locking surface 62R, and the swinging motion of the work table 8 is restricted (FIG. 5B).

  The same applies to the case where the work table 8 is swung leftward (clockwise) in plan view, and the left end dog 55L is the detection roller of the left end detection switch 51L before the work table 8 interferes with the boom 5. And the control contact 30 receiving the detection signal cuts off the power supply to the swing motor 25m in the rotational direction in which the work table 8 is swung leftward. . Further, the support plate 72L comes into contact with the locking surface 62L, and the swinging motion of the work table 8 is restricted (see the two-dot chain line in FIG. 5B).

  Therefore, the interference between the work table 8 and the boom 5 is prevented, and the swinging of the swinging motor 25m is further continued while the swinging motion of the work table 8 is mechanically suppressed. Damage to the motor can be prevented.

  According to the work table turning position detector 50 as described above, the detection switch 51 and the dog 55 for detecting the swing angle position of the work table 8 are connected to the vertical post portion 6 a and the work table bracket 7. The pivot position detecting mechanism can be made compact and the post cover 78 can be removed to remove the post cover 78 from the upper part of the upper surface area (rotational position detection space S). Therefore, the detection switch 51 can be easily attached / detached and the position of the dog 55 can be adjusted.

  Further, since the dog 55 is provided on the workbench bracket 7 side and the detection switch 51 is provided on the vertical post portion 6a side, the detection switch 51 may be swung each time the workbench 8 swings. There is no. Therefore, the arrangement environment of the detection switch can be improved to improve long-term reliability, and the entire apparatus can be configured at a low cost by using a general-purpose limit switch.

  Further, since the signal line 51s of the detection switch 51 is led out through the communication hole 61 that vertically passes through the vertical post portion 6a, the cover that protects the detection switch 51, its signal line 51s, the dog 55, and the like is a post. Since a small cap of about the diameter of the sleeve 7a is sufficient, and the signal line 51s of the detection switch 51 is led out through the inside of the vertical post portion, the signal line is reliably protected from falling objects and pinching. In addition, since the large cover is not required, the turning angle range of the work table that has been narrowed by the thickness of the cover can be expanded.

  The detected member detected by the detection switch 51 may be formed in an annular cam shape surrounding the outer periphery of the detection switch 51, and the roller at the tip of the detection arm is separated from the detected member at a predetermined rotational angle position. You may comprise so that it may detect. The contact of the detection switch may be either a form in which the switch contact is opened or a form in which the switch contact is closed when a member to be detected is detected. Furthermore, the detector is not limited to the limit switch, and may be another known detector such as a proximity switch or a photo interrupter.

It is the elements on larger scale of the boom tip part in an aerial work vehicle. It is an external view of a worktable turning mechanism in a state where a cover is removed. It is a top view of the turning position detection mechanism of the work table concerning the present invention. It is principal part sectional drawing of the said turning position detection mechanism. It is explanatory drawing which shows the effect | action of the said rotation position detection mechanism and an interference prevention mechanism. It is a perspective view of the boom type aerial work vehicle provided with the turning position detection mechanism of a work table.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High-altitude work vehicle 2 Car body 5 Boom 6 Swing support member 6a Vertical post part 7 Worktable bracket (held member)
7a Post sleeve (cylindrical part)
7b Arm unit 8 Work table 50 Turning position detection mechanism 51 Detection switch (rotation position detection means, detector)
51R Right end detection switch (rotation position detection means, detector)
51L Left end detection switch (Rotation position detection means, detector)
51s detection switch signal line 55 dog (rotation position detecting means, detected member)
55R right end dog (rotation position detection means, detected member)
55L left end dog (rotating position detecting means, detected member)
61 Communication hole 78 Post cover (cover member)

Claims (4)

A boom that can freely move up and down with respect to the vehicle body;
A vertical post portion is integrally provided at the tip of the boom so as to be swingable along the boom undulation angle plane, and the vertical post portion always takes a vertical posture regardless of the boom undulation angle. A swing support member swingable to hold;
A workbench supported so as to be capable of swiveling with respect to the vertical post part via a holding member rotatably connected to the vertical post part;
A rotation position detecting means for detecting a rotation angle position of the holding member with respect to the vertical post portion;
The rotational position detecting means is configured to be disposed in an upper surface region of a cylindrical portion of the held member that covers the outer periphery of the vertical post portion and is pivotally connected to the vertical post portion. A mechanism for detecting a turning position of a work table in a boom type work vehicle. The rotational position detecting means comprises a detected member and a detector that detects a rotational angle position of the supported member with respect to the vertical post portion by detecting a position of the detected member;
The member to be detected is provided on either the vertical post part side or the cylindrical part side in the pivot part of the vertical post part and the cylindrical part, and the detector is on the other side in the pivot part. The working position detection mechanism for a work platform in a boom type work vehicle according to claim 1, wherein the work position is detected. The detector has a signal line for outputting a detection signal;
The vertical post portion has a communication hole penetrating the vertical post portion up and down,
The detector is disposed at the upper end of the vertical post;
The detected member is disposed at an upper end portion of the held member that covers an outer periphery of the vertical post portion;
The mechanism for detecting a turning position of a work platform in a boom type work vehicle according to claim 2, wherein a signal line of the detector is led out to a lower part of the vertical post portion through the communication hole. .   The pivot of the work platform in the boom type work vehicle according to any one of claims 1 to 3, wherein a cover member that covers upper surfaces of the vertical post part and the cylindrical part is detachably provided. Position detection mechanism.

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