JP2007062989A - Operation lever locking device for industrial vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation lever locking device for an industrial vehicle, making it hard to cause accidental contact with an operator and perform operation for amusement in a locking condition. <P>SOLUTION: A plurality of operation levers 31, 41, 51, 61 are turnably provided on a vehicle-cross-direction shaft 22 via base end portions 32, 42, 52, 62. On the base end portions, locking bodies 37, 47, 57, 67 are provided on which downward-opening recessed locking portions 36, 46, 56, 66 are formed. A locking rod 70 provided on the lower side of the vehicle-cross-direction shaft in parallel thereto is formed to be freely rocked up and down around a longitudinal axial center 72a and to be freely upward engaged with a recessed locking portion group, when rocked up. A locking plate 80 can lock the other end of the locking rod in the engaged condition. In the locking condition, the locking rod is located on the lower side of the vehicle-cross-direction shaft and the locking plate is located on the side of the vehicle-cross-direction shaft, both being not protruded to an operator's seat side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an operation lever locking device for an industrial vehicle such as a forklift.

  Conventionally, the following configuration is provided as this type of apparatus. That is, the lower end portions of the plurality of work implement operation levers are supported by the support shaft and can be rotated in the front-rear direction around the support shaft, and the lower end of the work implement operation lever can be operated by the work implement via the lever and the link. Connected to the valve. The base end of the lock lever is fixed to one end of a rotating shaft supported by the bracket, and a lock plate is projected at a position substantially perpendicular to the work implement operation lever. The lock plate is formed with a lock hole for each work implement operation lever, and the lock hole is configured to be fitted to a lock pin protruding from the tip of the lever.

According to such a conventional configuration, the lock plate is removed from the lock pin by raising the lock lever to the unlock position, so that the work machine can be operated by operating the work machine operation lever. Further, by lowering the lock lever to the lock position, the locking hole of the lock plate can be fitted into the lock pin and the work implement operation lever can be locked (see, for example, Patent Document 1).
CD-ROM (page 5-6, Fig. 1-3) of Japanese Utility Model No. 5-14618 (Japanese Utility Model Application No. 6-67560)

  However, according to the above-described conventional configuration, the lock lever protrudes (exposes) toward the driver's seat when operated to the locked position, so that the driver may accidentally touch and misoperate or operate by mischief. It is easy to do.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an operation lever locking device for an industrial vehicle that is difficult to be contacted by a driver in the locked state and is difficult to be operated by mischief. It is.

  In order to achieve the above-described object, the operation lever locking device for an industrial vehicle according to claim 1 of the present invention is configured such that a plurality of operation levers are rotatable with respect to a vehicle width direction axis via a base end portion. And a locking body provided with a recessed locking portion that opens downward is provided at the base end portion of each operation lever, and a locking rod is provided in parallel to the lower side of the vehicle width direction axis. The locking rod is configured such that one end of the locking rod is supported through a front-rear direction pin so as to be swingable up and down around the front-rear direction axial center, and the recessed locking portion group is formed by swinging upward. It is configured to be freely engageable from below, and is provided with a lock plate capable of locking the other end of the locking rod engaged with the recessed engagement portion group. is there.

  Therefore, according to the invention of claim 1, by releasing the lock on the other end of the lock rod by the lock plate, the lock rod can be swung downward around the longitudinal axis by its own weight. The lock rod can be detached from the recessed engagement portion group of the engagement body group, and each operation lever can be operated individually as unlocking. When locking the operating lever group, turn each operating lever to the neutral position so that the locking body group faces the locking rod, and then swing the locking rod upward around the longitudinal axis. The engaging body group is engaged from below with the recessed engaging portion group. Next, by locking the other end portion of the lock rod with the lock plate, the lever lock state in which the lock rod is engaged with the concave engagement portion group can be fixed (held).

  According to a second aspect of the present invention, there is provided the operation lever locking device for an industrial vehicle according to the first aspect, wherein a guide body having a long hole in the vertical direction is provided, and a locking rod is provided in the long hole. The other end side is fitted.

  Therefore, according to the second aspect of the present invention, the rocking rod can be swung up and down around the axial center in a stable manner without being swung from side to side by guiding the other end to the long hole.

  According to the first aspect of the present invention described above, by releasing the lock on the other end of the lock rod by the lock plate, the lock rod can be swung downward around the longitudinal axis by its own weight. Thus, the locking rod can be detached from the recessed engaging portion group of the engaging body group, and each operation lever can be operated individually as unlocking, and thus a plurality of operating portions can be operated. When locking the operating lever group, turn each operating lever to the neutral position so that the locking body group faces the locking rod, and then swing the locking rod upward around the longitudinal axis. Thus, it is possible to engage with the recessed engaging portion group of the engaging body group from below, and then lock the other end portion of the locking rod with the lock plate to lock the recessed engaging portion group The lever locked state with the rod for engagement can be fixed (held).

  In this way, it is possible to fix the lever lock state in which the lock rod is engaged with the recessed engagement portion group of the lock body group. In such a lock state, the lock rod is fixed to the vehicle. It is located below the width direction axis, and the lock plate is located on the side of the vehicle width direction axis. Therefore, it is difficult for the driver to contact the locking rod or the lock plate unexpectedly, and even if the driver makes an unexpected contact, it is difficult to perform an erroneous operation, and it is also difficult to perform a mischievous operation.

  According to the second aspect of the present invention described above, the vertical rocking of the locking rod around the longitudinal axis is stably performed without swinging left and right by the other end being guided by the long hole. Therefore, the engagement with the recessed engagement portion group by swinging the locking rod upward can be easily and reliably performed.

[Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings as a state adopted in a counter-type forklift.

  In FIG. 2, a forklift (an example of an industrial vehicle) 1 is provided with a pair of left and right front wheels (drive wheels) 3 at the front part of its vehicle body 2 and a pair of left and right rear wheels 4 at the rear part. A driver's seat 5 is provided above the front portion of the vehicle body 2. A mast 6 that can be expanded and contracted in the vertical direction is attached to the front end portion of the vehicle body 2 via a connecting shaft 7 in the vehicle width direction (lateral direction) so as to be tiltable in the front-rear direction and tilted in the front-rear direction. 8 is provided between the vehicle body 2 side and the mast 6.

  The mast 6 includes a pair of left and right outer frames 9 attached to the vehicle body 2 via a connecting shaft 7, and a pair of left and right inner frames 10 which are guided by the outer frame 9 and can freely move up and down. A lift cylinder 11 is provided between the inner frame 10 and the inner frame 10. In addition, a lift bracket 12 that is guided to the inner frame 10 side and that can freely move up and down is provided, and a pair of left and right forks 13 is provided on the lift bracket 12 via a pair of upper and lower finger bars. The lift bracket 12 includes a side shift cylinder for moving both forks 13 in the vehicle width direction (left and right direction) at the same time, and a pitch between both forks 13 in the vehicle width direction (left and right direction). Fork shift cylinders (both not shown) are provided.

  The driver's seat 5 is provided with a seat 14, a handle 15 positioned in front of the seat 14, and a head guard 16 is provided above. Further, a counterweight 17 is provided on the vehicle body 2 behind the seat 14, and an engine 18 is provided on the vehicle body 2 side. The driver seat 5 is provided with a valve device 19 including a control valve group corresponding to each cylinder (8, 11, etc.).

  The driver's seat 5 is provided with an operating lever group for operating each part via the valve device 19 and the like. That is, in FIGS. 1 and 3 to 6, a cabinet 20 is provided in front of the seat 14 in the driver's seat 5, and a pair of support plates 21 are provided on the inner surface side of the cabinet 20 in the vehicle width direction. Yes. A vehicle width direction shaft 22 is provided between the support plates 21. At this time, one end of the vehicle width direction shaft 22 is engaged with an engagement hole 23 formed in one support plate 21, and the other end. Is inserted through a cylindrical body 24 provided on the inner surface of the other support plate 21.

  Four (a plurality of) operation levers are provided rotatably with respect to the vehicle width direction shaft 22 via a base end portion. Here, the operation lever includes a lift operation lever 31 corresponding to the lift cylinder 11, a tilt operation lever 41 corresponding to the tilt cylinder 8, and a side shift operation lever 51 corresponding to the side shift cylinder. And fork shift operation levers 61 corresponding to the fork shift cylinders, and cylindrical members (an example of the base end portions) 32, 42 integrated with the base ends of these operation levers 31, 41, 51, 61 , 52 and 62 are rotatably fitted to the vehicle width direction shaft 22.

  Arms 33, 43, 53, 63 project from the cylindrical members 32, 42, 52, 62 forward, and the upper ends of the links 34, 44, 54, 64 are connected to these arms 33, 43, 53, 63. It is connected. The lower ends of the links 34, 44, 54, 64 are connected to valve levers 35, 45, 55, 65 on the valve device 19 side. The cylinder members 32, 42, 52, 62 of the operation levers 31, 41, 51, 61 have locking bodies 37, 47, 57 in which recessed openings 36, 46, 56, 66 having lower openings are formed. , 67 are provided downward.

  A locking rod 70 is provided in parallel with the lower side of the vehicle width direction shaft 22, and one end of the locking rod 70 is supported by a bracket 71 from one support plate 21 side via a front / rear direction pin 72. Thus, it is configured to be swingable up and down around the longitudinal axis 72a. Then, the locking rod 70 is engaged from below with the concave engagement portions 36, 46, 56, 66 by swinging upward around the longitudinal axis 72a, and swinging downward. Thus, the concave engaging portions 36, 46, 56, and 66 are configured to be released downward.

  At that time, a guide body 74 having an elongated hole 73 in the vertical direction is integrally provided on the lower end side of the other support plate 21, and the other end side of the locking rod 70 is fitted into the elongated hole 73. Thus, vertical swinging around the longitudinal axis 72a is restricted. A grip 75 is provided at the other end (free end) of the locking rod 70.

  On the outer surface side of the other support plate 21, a lock plate 80 is provided that can lock the other end of the lock rod 70 engaged with the recessed engagement portions 36, 46, 56, and 66 groups. . That is, the lock plate 80 has a support through-hole 81 formed in the upper portion, a lock through-hole 82 formed in the middle portion, and a lock-opening locking engagement portion 83 opened in the rear portion formed in the lower portion. An operating body 84 is provided downward from the lower end.

  The lock plate 80 is screwed into a screw hole 25 formed at the other end of the vehicle width direction shaft 22 by screwing a bolt body 85 passed through the support through hole 81 from the other end side into the vehicle width direction shaft 22. It is attached to the side so that it can swing back and forth. At that time, the locking recess 83 is engaged with the other end portion of the locking rod 70 in the engagement position by the downward backward swing, and the engagement is released by the forward swing. It is configured. In addition, a bolt body 86 that is passed through the lock through hole 82 from the other end side is formed on the other support plate 21 in a state where the lock recessed engagement portion 83 is engaged with the other end portion of the lock rod 70. The engagement lock plate 75 is fixed to the support plate 21 side by being screwed into the screw hole 87.

The operation in the above embodiment will be described below.
The forklift 1, as shown by solid lines in FIGS. 1, 4, and 6, swings the locking rod 70 downward around the longitudinal axis 72 a, so that the recessed engagement portions 36, 46, 56 are moved. , 66 can be moved downwards to allow the operation levers 31, 41, 51, 61 to be unlocked and operated separately.

  That is, an operator sitting on the seat 14 of the driver's seat 5 operates, for example, the lift operating lever 31 to rotate the cylindrical member 32 with respect to the vehicle width direction shaft 22, and via the arm 33 and the link 34. By operating the valve lever 35 on the valve device 19 side and operating the lift cylinder 11 via the control valve, the fork 13 can be moved up and down along the mast 6 via the lift bracket 12 or the like. The expected fork work can be done. Further, the tilt lever 41 is operated to rotate the cylindrical member 42 with respect to the vehicle width direction shaft 22, and the valve lever 45 on the valve device 19 side is operated via the arm 43 and the link 44. By actuating the tilt cylinder 8 via the mast 6, the mast 6 can be tilted back and forth around the connecting shaft 7, so that the posture of the fork 13 can be changed via the lift bracket 12 or the like.

  Then, the side shift operation lever 51 is operated to rotate the cylindrical member 52 with respect to the vehicle width direction shaft 22, and the valve lever 55 on the valve device 19 side is operated via the arm 53 and the link 54 to control the cylinder member 52. By operating the side shift cylinder via the valve, both forks 13 can be moved simultaneously in the vehicle width direction (left-right direction), so that the position of the fork 13 in the vehicle width direction relative to the vehicle body 2 can be changed. Further, the fork shift operation lever 61 is operated to rotate the cylindrical member 62 with respect to the vehicle width direction shaft 22, and the valve lever 65 on the valve device 19 side is operated via the arm 63 and the link 64 to perform control. By operating the fork shift cylinder via the valve, the forks 13 can be moved relatively close to each other, and the pitch between the forks 13 can be adjusted in the vehicle width direction (left-right direction).

  When the operation of the forklift 1 that can be operated in this way is stopped and the operation levers 31, 41, 51, 61 are locked when getting off the vehicle, the operation levers 31, 41, 51, 61 are rotated to neutral positions, The locking bodies 37, 47, 57, and 67 are opposed to the locking rod 70. Next, the bolt body 86 is unscrewed from the screw hole 87 to release the lock plate 80 from the support plate 21. Then, in a state where the lock plate 80 is swung forward via the operation body 84, the locking rod 70 is swung upwardly around the longitudinal axis 72a via the gripping portion 75, and the locking body 37, The locking rod 70 is engaged from below with the concave insertion locking portions 36, 46, 56, and 66 of the 47, 57, and 67 groups. At this time, the rocking rod 70 can be swung upward by the other end being guided by the elongated hole 73 without swinging left and right, so that the engagement with respect to the concave engagement portions 36, 46, 56, and 66 is related. Can be done easily and reliably.

  Next, the lock plate 80 is swung rearward (toward the driver's seat 5) via the operation body 84, and the lock recess locking portion 83 is engaged with the other end portion of the lock rod 70. Thereafter, by engaging the bolt body 86 with the screw hole 87, the engagement lock plate 80 can be fixed to the support plate 21 as shown in the phantom line of FIG. 1, the phantom line of FIG. 4, and the phantom line of FIG. Therefore, the lever lock state in which the locking rod 70 is engaged with the group of the recessed engaging portions 36, 46, 56, 66 can be fixed (held).

  In this way, the locking rod 70 is engaged with the concave engagement portions 36, 46, 56, and 66 of the engaging bodies 37, 47, 57, and 67, and the locking rod 70 is engaged. In such a locked state, the locking rod 70 is positioned below the vehicle width direction shaft 22, and the lock plate 80 is located on the side of the vehicle width direction shaft 22. They are located and none of them protrudes toward the driver's seat. Accordingly, it is difficult for the driver to contact the locking rod 70 and the lock plate 80 unexpectedly, and even if the driver makes an unexpected contact, it is difficult to perform an erroneous operation, and further, an operation by mischief is difficult.

  In order to release the lever locked state, the bolt body 86 is unscrewed from the screw hole 87 to release the lock plate 80 from the support plate 21, and then the lock plate 80 is moved forward via the operation body 84. By oscillating, the engagement of the locking recessed engagement portion 83 with the other end portion of the locking rod 70 can be released, that is, the locking of the locking rod 70 by the lock plate 80 can be released. As a result, the locking rod 70 swings downward around the longitudinal axis 72a due to its own weight, so that the recessed locking portions 36, 46, 56, 66 of the locking bodies 37, 47, 57, 67 are grouped. In contrast, the locking rod 70 can be detached. At that time, the rocking rod 70 can be swung downwardly stably without swinging from side to side by guiding the other end to the long hole 73. Thereafter, the bolt body 86 is screwed into the screw hole 87 to fix the lock plate 80 to the support plate 21.

  In the above-described embodiment, there is shown a form in which four operation levers, that is, a lift operation lever 31, a tilt operation lever 41, a side shift operation lever 51, and a fork shift operation lever 61 are provided. This may be a type in which two, three, four or more operation levers are provided. The operation lever may be a clamp device operation lever, a rotation device operation lever, or the like.

  In the above-described embodiment, a form in which the lock plate 80 is fixed by the bolt body 86 is shown, but this may be a form in which the lever lock state is fixed (held) by spring biasing.

  In the above-described embodiment, a guide body 74 having a long hole 73 in the vertical direction is provided, and the other end side of the locking rod 70 is fitted into the long hole 73. This is a guide body. A format in which 74 is omitted may be used.

  In the above-described embodiment, the counter-type forklift 1 is shown as an industrial vehicle. However, the counter-type forklift 1 works in the same manner even in a cargo handling vehicle such as a large transport vehicle or a side forklift, or various work vehicles. It is possible.

1 is a partially cutaway perspective view of an operating lever locking device for an industrial vehicle according to an embodiment of the present invention. It is a side view of the industrial vehicle. It is a side view of the operation lever locking device of the industrial vehicle. It is a partially cutaway front view of the operating lever locking device of the industrial vehicle. It is a partially notched top view of the operating lever locking device of the industrial vehicle. It is a vertical side view of the principal part in the operating lever locking device of the industrial vehicle.

Explanation of symbols

1 Forklift (industrial vehicle)
2 Car body 5 Driver's seat 6 Mast 7 Connecting shaft 8 Tilt cylinder 9 Outer frame 10 Inner frame 11 Lift cylinder 13 Fork 15 Handle 19 Valve device 20 Cabinet 21 Support plate 22 Vehicle width direction shaft 31 Lift operation lever 32 Cylindrical member ( (Base end part)
36 Recessed locking portion 37 Locking body 41 Tilt operating lever 42 Tube member (base end portion)
46 Recessed locking portion 47 Locking body 51 Side shift operating lever 52 Cylindrical member (base end portion)
56 Recessed locking portion 57 Locking body 61 Fork shift operation lever 62 Cylindrical member (base end portion)
66 Recessed locking part 67 Locking body 70 Locking rod 71 Bracket 72 Front / rear direction pin 72a Front / rear direction axial center 73 Long hole 74 Guide body 80 Lock plate 83 Locking recessed locking part 86 Bolt body 87 Screw hole

Claims (2)

  A plurality of operation levers are provided to be rotatable with respect to the vehicle width direction axis through a base end portion, and a base opening portion of each operation lever is formed with a downwardly open recessed locking portion. A locking body is provided, and a locking rod is provided in parallel with the lower side of the vehicle width direction axis. The locking rod is supported around one end of the locking rod by a front and rear direction pin, so that It is configured to be able to swing up and down and to be able to engage with the recessed locking portion group from below by swinging upward, and to lock the recessed locking portion group in an engaged state. An operating lever locking device for an industrial vehicle, characterized in that a lock plate capable of locking the other end of the rod is provided. 2. The operating lever locking device for an industrial vehicle according to claim 1, wherein a guide body having a long hole in the vertical direction is provided, and the other end side of the locking rod is fitted into the long hole.

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