JP2011063361A - Lever device in industrial vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lever device in an industrial vehicle capable of automatically regulating simultaneous operation by two operation levers, without performing complicated operation. <P>SOLUTION: A first cam plate 19 and a second cam plate 20 are integrally formed on a lifting lever 12 and a tilt lever 13. The first cam plate 19 and the second cam plate 20 have a first sliding surface 19c and a second sliding surface 20b. The first sliding surface 19c and the second sliding surface 20b are oppositely arranged via a clearance 21. A lock roller 22 as an engaging member rotatably supported by an arm member 23, is arranged in the clearance 21. A first recessed part 19d and a second recessed part engaging with the lock roller 22, are respectively formed on the first sliding surface 19c and the second sliding surface 20b. The lock roller 22 respectively engages with the first recessed part 19d and the second recessed part, and regulates the simultaneous operation from a neutral position of the lifting lever 12 or the tilt lever 13. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a lever device capable of regulating simultaneous operation of a cargo handling lever in an industrial vehicle such as a forklift.

In the prior art disclosed in Patent Document 1, an elevating device that can move a fork provided on the mast up and down, an elevating lever that is operated when operating the elevating device, and adjusting the forward and backward tilt angles of the mast A limiting device is disclosed that includes a tilt device that can be operated and a tilt lever that is operated when the tilt device is operated, and that restricts simultaneous operation of the lift lever and the tilt lever. The limiting device includes a locking portion that can be locked to the elevating lever and the tilt lever, a support portion that is fixed to the lever box, and a swinging arm that is connected to the locking portion and is swingably supported by the support portion. Department. The elevating lever and the tilt lever are arranged side by side with a predetermined interval.
The locking portion is configured to be swingable in a direction orthogonal to the operation direction of the elevating lever and the tilt lever. The lifting / lowering lever or the tilt lever is locked to the locking portion by swinging the locking portion to the lifting / lowering lever side or the tilt lever side. Therefore, the operation of the lifting lever (movement from the neutral position) or the operation of the tilt lever (movement from the neutral position) is prohibited only by swinging the locking portion with a fingertip or the like.

  Moreover, in the prior art disclosed in Patent Document 2 and Patent Document 3, a regulating member that regulates the movement of the shift lever and the forward / reverse switching lever arranged in parallel is provided. Along with the movement of the lever, it is provided so as to be swingable about the support shaft. The restriction member restricts the movement of the forward / reverse switching lever to the reverse area when the shift lever is in the high speed area, and restricts the movement of the transmission lever to the high speed area when the forward / reverse switching lever is in the reverse area Yes. Therefore, high-speed traveling when the vehicle moves backward is prevented.

JP 2007-276842 A (pages 6 to 8, FIGS. 1 to 5) Japanese Utility Model Publication No. 60-184731 (7th to 10th pages, FIGS. 3 to 5) Japanese Utility Model Publication No. 1-73416 (pages 5-8, FIG. 1)

However, in the prior art disclosed in Patent Document 1, for example, when the driver operates the elevating lever, the driver holds the grip portion of the elevating lever and swings the engaging portion toward the tilt lever side with the fingertip. It must be complicated and requires complex operations.
In the prior art disclosed in Patent Literature 2 and Patent Literature 3, when the driver operates the speed change lever or the forward / reverse switching lever, the regulating member is automatically swung, and the vehicle travels at a high speed when the vehicle moves backward. Can be prevented. However, under limited conditions, both the speed change lever and the forward / reverse switching lever can be operated simultaneously, and when one lever is in the operating state, the operation of the other lever is not completely restricted.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a lever in an industrial vehicle that can automatically control simultaneous operation by two operation levers without performing complicated operations. In providing equipment.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a lever device in an industrial vehicle provided with a first operation lever and a second operation lever arranged in parallel with each other for carrying out cargo handling, The first operation lever and the second operation lever include a first cam plate and a second cam plate, respectively, and the first cam plate and the second cam plate have a first sliding surface recessed in an arc shape, and The first sliding surface and the second sliding surface are arranged to face each other via a gap, and an engaging member is inserted into the gap. A first engaged surface and a second engaged surface, wherein the engaging member is engaged with the first sliding surface and the second sliding surface. A mating surface is formed, and the engaging member is connected to the first engaged surface or the second engaged surface. In combination, the operation from the neutral position of the first operation lever or the second operation lever is restricted, and when the first operation lever is operated, the engagement member is engaged with the second engaged surface. Then, the operation from the neutral position of the second operation lever is restricted, and when the second operation lever is operated, the engagement member engages with the first engaged surface and the first operation lever. The operation from the neutral position is regulated.

  According to the first aspect of the present invention, when the first operating lever is operated, the engaging member engages with the second engaged surface formed on the second sliding surface to neutralize the second operating lever. The operation from the position is restricted. When the second operating lever is operated, the engaging member engages with the first engaged surface formed on the first sliding surface to restrict the operation from the neutral position of the first operating lever. Yes. Thus, when one operating lever is operated, the operation of the other operating lever is automatically restricted. Therefore, the simultaneous operation of the first operation lever and the second operation lever can be automatically controlled without performing a complicated operation.

  According to a second aspect of the present invention, in the lever device for an industrial vehicle according to the first aspect, the first operation lever is a lift lever, the second operation lever is a tilt lever, and the engagement member is the The first sliding surface is arranged with a slight gap.

According to the second aspect of the present invention, since the first operating lever is the lifting lever and the second operating lever is the tilt lever, the simultaneous operation of the lifting operation of the fork by the lifting lever and the forward and backward tilting operation of the mast by the tilt lever is performed. Can be regulated.
Further, since the engaging member is disposed with a slight gap from the first sliding surface, it is possible to ensure fine operability particularly when operating the lifting lever that is frequently used. The fine operability refers to the ease of operation of the elevating lever or tilt lever when the fork or mast is moved by a small distance.

  According to a third aspect of the present invention, in the lever device in the industrial vehicle according to the first or second aspect, the engagement member is a roller rotatably supported by a bearing on an arm member swingably attached to a vehicle body. It is characterized by being.

  According to the invention of claim 3, since the engaging member is a roller rotatably supported by the arm member by the bearing, the first sliding surface and the second sliding surface of the roller, the first cam plate, and the second cam plate When the surface slides in contact with the surface, the roller rolls to reduce the sliding resistance between the first cam plate and the second cam plate. In particular, it is possible to ensure fine operability so as not to give a sense of incongruity to the lever operation that is not regulated.

  According to the present invention, the simultaneous operation of the first operation lever and the second operation lever can be automatically controlled without performing a complicated operation.

It is a side view showing the whole lever device composition concerning the embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. It is a principal part expansion perspective view of the lever apparatus which concerns on embodiment of this invention. It is a side view which shows the state at the time of raising / lowering lever operation in the lever apparatus which concerns on embodiment of this invention. It is a side view which shows the state at the time of tilt lever operation in the lever apparatus which concerns on embodiment of this invention. It is a mimetic diagram for explaining operation in a lever device concerning an embodiment of the present invention. (A) The lift lever and tilt lever are in the neutral position, (b) The lift lever is rotated from the neutral position to the rear, and (c) The lift lever is rotated from the neutral position to the front. Operated state. It is a mimetic diagram for explaining operation in a lever device concerning an embodiment of the present invention. (A) The lift lever and tilt lever are in the neutral position, (b) The tilt lever is rotated forward from the neutral position, and (c) The tilt lever is rotated backward from the neutral position. Operated state. It is a side view which shows the whole structure of the lever apparatus which concerns on other embodiment.

(Embodiment of the present invention)
Hereinafter, a lever device 10 in a forklift that is a kind of industrial vehicle according to an embodiment of the present invention will be described with reference to FIGS.
The forklift is provided with a cab (not shown) in which a driver who operates the forklift can get in. A lever device 10 is provided on the side of the driver's seat in the cab.

As shown in FIG. 1, the lever device 10 includes a fixing member 11 erected on the vehicle body, and an elevating lever 12, a tilt lever 13, and a side shift lever 14 that are juxtaposed on the fixing member 11 in the left-right direction. . In FIG. 1, the right direction indicates the front of the forklift, and the left direction indicates the rear of the forklift. In front of the forklift, a cargo handling device such as a fork, a mast, an elevating cylinder, a tilt cylinder, and a side shift cylinder (not shown) is provided. In FIG. 1, the direction perpendicular to the paper surface indicates the left-right direction, and the vertical direction of the paper surface indicates the vertical direction of the forklift. The elevating lever 12, the tilt lever 13 and the side shift lever 14 are arranged in this order from the left side to the right side of the vehicle. (See Figure 3)
A hydraulic control device 15 such as a control valve is attached to the fixed member 11 at the rear, and the hydraulic control device 15 is connected to a lifting cylinder, a tilt cylinder, a side shift cylinder, and the like (not shown).

As shown in FIG. 1, the elevating lever 12 corresponding to the first operating lever extends upward while inclining forward. The elevating lever 12 is provided with a grip portion 12a at the upper end thereof. When the driver operates the elevating lever 12, the grip portion 12a is grasped and can be operated in the front-rear direction. FIG. 1 shows a state in which the elevating lever 12 is in the neutral position.
As shown in FIG.1 and FIG.2, the raising / lowering lever 12 is being fixed to the rectangular support plate 16 by welding etc. in the lower end part. The support plate 16 has a rectangular long side in the vertical direction, and is fixedly attached to a mounting seat 15a of the hydraulic control device 15 by screws 26. Further, an L-shaped first cam plate 19 in a top view is fixed to the support plate 16 so as to protrude forward.
When the elevating lever 12 is operated in the forward or backward direction, the amount of hydraulic oil supplied to the elevating cylinder via the hydraulic control device 15 changes, and the elevating cylinder moves up and down as the elevating cylinder extends or contracts. Operation is performed.

As shown in FIG. 1, the tilt lever 13 corresponding to the second operation lever extends upward while inclining forward. The tilt lever 13 is provided with a grip portion 13a at the upper end thereof, and is configured to be able to be operated in the front-rear direction by gripping the grip portion 13a when the driver operates the tilt lever 13. FIG. 1 shows a state in which the tilt lever 13 is in the neutral position.
As shown in FIGS. 1 and 2, the tilt lever 13 is fixed to a rectangular support plate 17 at the lower end by welding or the like. The support plate 17 is fixedly attached to a mounting seat 15 b of the hydraulic control device 15 with screws 26. In addition, an L-shaped second cam plate 20 in a top view is fixed to the support plate 17 so as to protrude forward.
When the tilt lever 13 is operated in the forward or backward direction, the amount of hydraulic oil supplied to the tilt cylinder through the hydraulic control device 15 changes, and the tilt cylinder expands or contracts to move the front and rear of the mast. Tilt action is performed.

As shown in FIG. 1, the side shift lever 14 extends upward while inclining forward. The side shift lever 14 is provided with a grip portion 14a at the upper end thereof, and is configured to be able to operate in the front-rear direction by gripping the grip portion 14a when the driver operates the side shift lever 14. FIG. 1 shows a state in which the side shift lever 14 is in the neutral position.
As shown in FIGS. 1 and 2, the side shift lever 14 is fixed to a rectangular support plate 18 at the lower end by welding or the like. The support plate 18 is fixedly attached to a mounting seat 15 c of the hydraulic control device 15 with screws 26.
When the side shift lever 14 is operated forward or backward, the supply amount of hydraulic oil supplied to the side shift cylinder via the hydraulic control device 15 changes, and the side shift cylinder expands or contracts. The fork is shifted in the left-right direction.

As shown in FIGS. 1 and 3, the first cam plate 19 has a flat plate portion 19a that protrudes forward, and a crescent-shaped plate member 19b that curves forward is formed on the right side of the front end portion of the flat plate portion 19a. It is attached. A first sliding surface 19c that is recessed in an arc shape toward the front is formed at the rear end portion of the plate member 19b, and a first portion corresponding to the first engaged surface is formed at the center of the first sliding surface 19c. A recess 19d is formed.
And the 2nd cam plate 20 has the flat plate part 20a which protrudes ahead, The 2nd sliding surface 20b which protruded circularly toward the front is formed in the front-end part of the flat plate part 20a, A second recess 20c corresponding to the second engaged surface is formed at the center of the two sliding surfaces 20b. The flat plate portion 19a of the first cam plate 19 and the flat plate portion 20a of the second cam plate 20 are arranged in parallel in the left-right direction, and the flat plate portion 19a is disposed forward of the flat plate portion 20a with respect to the plate member 19b. It is longer than the length.

The first sliding surface 19c and the second sliding surface 20b are opposed to each other in the front-rear direction with a gap 21 therebetween. In addition, when the raising / lowering lever 12 and the tilt lever 13 are in a neutral position, the 1st recessed part 19d and the 2nd recessed part 20c are also facing the front-back direction. A lock roller 22 corresponding to an engaging member is disposed in the gap 21. The lock roller 22 is rotatably supported by a bearing on a shaft 24 attached to the lower end portion of the plate-like arm member 23. The shaft 24 is attached with the axial direction directed in the left-right direction, one end is fixed to the arm member 23, and the lock roller 22 is attached to the other end. A cam follower is used as the lock roller 22.
A shaft member 25 extending in the left-right direction is fixed to the arm member 23 at the upper end of the arm member 23. The shaft member 25 is rotatably supported between L-shaped attachment members 11 a and 11 b attached to the upper end portion of the fixed member 11.

  As shown in FIG. 1, the lock roller 22 is in a state of being engaged with the second recess 20 c of the second cam plate 20 (a state in which the rear part is fitted). It is set to be shifted backward from the axis. Here, l is a center line connecting the axis of the shaft 24 and the axis of the shaft member 25, m is a perpendicular drawn to the axis of the shaft member 25, and α is an angle between the center line 1 and the perpendicular m. To do. Then, the arm member 23 is suspended from above at an inclination angle α (an angle α in the left rotation direction in FIG. 1), and the lock roller 22 supported at the lower end of the arm member 23 is caused by gravity. It exists in the state contact | abutted with the 2nd recessed part 20c. At this time, since the inclination angle α is set small, the pressure contact force when the surface of the lock roller 22 abuts on the second recess 20c is in a very slight state. This state is referred to as a light pressure contact state.

FIG. 4 shows a state in which the elevating lever 12 is rotated forward from the neutral position. At this time, the first cam plate 19 integrally formed via the elevating lever 12 and the support plate 16 is positioned downward. It is turned toward By the way, the pivot axis O of the elevating lever 12 and the first cam plate 19 is located near the hydraulic control device 15 behind the support plate 16. The first sliding surface 19c of the first cam plate 19 is formed in an arc shape with the rotation axis O as the center.
The rear portion of the lock roller 22 is fitted into the second recess 20c of the second cam plate 20, and the front portion is in a position facing the first sliding surface 19c of the first cam plate 19 with a slight gap. As shown in FIG. 6C, if the gap distance is g, the depth distance of the second recess 20c is h1, the outer dimension of the lock roller 22 is k, and the width distance of the gap 21 is w, the lock roller The outer dimension k of 22 is set larger than the width distance w of the gap 21 and smaller than the width distance w of the gap 21 plus the depth distance h1 of the second recess 20c. Therefore, the relationship of w <k <w + h1 is established, but since h1 + w = k + g, the relationship of 0 <g <h1 is established. That is, the gap distance g is greater than 0 (zero) and smaller than the depth distance h1 of the second recess 20c.

FIG. 5 shows a state in which the tilt lever 13 is rotated forward from the neutral position. At this time, the second cam plate 20 formed integrally with the tilt lever 13 and the support plate 17 is positioned downward. It is turned toward Incidentally, the pivot axis P of the tilt lever 13 and the second cam plate 20 is at a position near the hydraulic control device 15 behind the support plate 17 and at the same position as the pivot axis O. The second sliding surface 20b of the second cam plate 20 is formed in an arc shape with the rotation axis P as the center.
The lock roller 22 moves to the first recess 19d side of the first cam plate 19 disposed opposite to the second recess 20c, the front portion of the lock roller 22 is fitted into the first recess 19d, and the rear portion of the lock roller 22 is The second cam plate 20 comes into contact with the second sliding surface 20b. As shown in FIG. 7C, if the depth distance of the first recess 19d is h2, the outer dimension of the lock roller 22 is k, and the width distance of the gap 21 is w, the outer dimension k of the lock roller 22 is The width 21 is set to be larger than the width distance w of the gap 21 and set to be smaller (including the case where they are equal) than the width distance w of the gap 21 plus the depth distance h2 of the first recess 19d. Therefore, the relationship of w <k ≦ w + h2 is established.

About the lever apparatus 10 which has the above structure, the effect | action description is performed based on FIG.6 and FIG.7. 6 and 7 are schematic diagrams for explaining the behavior of the first cam plate 19 and the second cam plate 20 in accordance with the turning operation of the elevating lever 12 or the tilt lever 13.
As shown in FIG. 6A, when the elevating lever 12 and the tilt lever 13 are in the neutral position, the lock roller 22 is in a state where the rear portion is fitted in the second recess 20 c of the second cam plate 20. At this time, the lock roller 22 is pressed toward the second cam plate 20 by gravity, and the surface of the lock roller 22 and the second recess 20c are in contact with each other. On the other hand, the lock roller 22 is at a position facing the first recess 19d of the first cam plate 19 but is not in contact therewith and there is a gap.

Next, as shown in FIG. 6B, when the lifting lever 12 is rotated from the neutral position to the rear, the first cam plate 19 integrally formed with the lifting lever 12 is rotated. It is rotated upward about O. At this time, the lock roller 22 is fitted in the second concave portion 20c of the second cam plate 20 at the rear portion and is in contact with the second concave portion 20c, while the front portion is slightly spaced from the first sliding surface 19c of the first cam plate 19. It is in the position which faced through. When the lifting lever 12 is rotated backward, the first cam plate 19 integrally formed with the lifting lever 12 maintains a gap distance g between the first and second cam plates 19 because of the relationship of 0 <g. However, it can be rotated upward.
Incidentally, there is a relationship of 0 <g <h1 between the gap distance g and the depth distance h1 of the second recess 20c. Therefore, in this state, if the tilt lever 13 formed integrally with the second cam plate 20 is to be operated, the lock roller 22 is pushed forward and tries to come out of the second recess 20c. The first sliding surface 19c is contacted and forward movement is restricted. As a result, the lock roller 22 cannot be removed from the second recess 20c, and the tilt lever 13 cannot be moved (operated). Therefore, the simultaneous operation of the tilt lever 13 is restricted when the lifting lever 12 is rotated backward.

Next, as shown in FIG. 6C, when the elevating lever 12 is rotated forward from the neutral position, the first cam plate 19 formed integrally with the elevating lever 12 is rotated. It is rotated downward about O. At this time, the lock roller 22 is fitted in the second concave portion 20c of the second cam plate 20 at the rear portion and is in contact with the second concave portion 20c, while the front portion is slightly spaced from the first sliding surface 19c of the first cam plate 19. It is in the position which faced through. When the lifting lever 12 is rotated forward, the first cam plate 19 integrally formed with the lifting lever 12 maintains a gap distance g between the first and second cam plates 19 because of the relationship of 0 <g. However, it can be rotated downward.
Incidentally, there is a relationship of 0 <g <h1 between the gap distance g and the depth distance h1 of the second recess 20c. Therefore, in this state, if the tilt lever 13 formed integrally with the second cam plate 20 is to be operated, the lock roller 22 is pushed forward and tries to come out of the second recess 20c. The first sliding surface 19c is contacted and forward movement is restricted. As a result, the lock roller 22 cannot be removed from the second recess 20c, and the tilt lever 13 cannot be moved (operated). Therefore, the simultaneous operation of the tilt lever 13 is restricted when the lifting lever 12 is rotated forward.

As described above, when the lifting lever 12 is rotated forward or backward, the lock roller 22 cannot be fitted into the second recess 20c of the second cam plate 20 and thus cannot be pulled out, so that it is formed integrally with the second cam plate 20. Simultaneous operation of the tilt lever 13 is restricted.
Further, when the lifting lever 12 is rotated forward or backward, the first cam plate 19 integrally formed with the lifting lever 12 rotates downward or upward while maintaining a gap distance g with the lock roller 22. Since it is movable, fine operability can be ensured particularly during the turning operation of the lifting lever 12 that is frequently used.
The forward operation of the lifting lever 12 corresponds to the lowering operation of the fork, and the backward operation of the lifting lever 12 corresponds to the lifting operation of the fork.

As shown in FIG. 7A, when the elevating lever 12 and the tilt lever 13 are in the neutral position, they are the same as in FIG.
Next, as shown in FIG. 7B, when the tilt lever 13 is rotated forward from the neutral position, the second cam plate 20 formed integrally with the tilt lever 13 has a rotation axis. It is rotated downward about P. At this time, the lock roller 22 is changed from the contact with the second recess 20c of the second cam plate 20 to the contact with the second sliding surface 20b, so that the lock roller 22 is pressed forward against the gravity to be the first. The cam plate 19 moves to the first concave portion 19d side and the front portion is fitted into the first concave portion 19d. When the tilt lever 13 is rotated forward, the lock roller 22 is rolled on the second sliding surface 20b while receiving a light pressure contact force due to gravity in the direction of the second sliding surface 20b of the second cam plate 20. .
Incidentally, a relationship of w <k ≦ w + h2 is established between the outer dimension k of the lock roller 22, the depth distance h2 of the first recess 19d, and the width distance w of the gap 21. Therefore, in this state, if the lifting lever 12 integrally formed with the first cam plate 19 is to be operated, the lock roller 22 is pushed rearward and tries to come out of the first recess 19d, but the second cam plate 20 The rearward movement is restricted by being in contact with the second sliding surface 20b. As a result, the lock roller 22 cannot be removed from the first recess 19d, so that the elevating lever 12 cannot be moved (operated). Therefore, when the tilt lever 13 is rotated forward, the simultaneous operation of the elevating lever 12 is restricted.

Next, as shown in FIG. 7C, when the tilt lever 13 is rotated from the neutral position to the rear, the second cam plate 20 integrally formed with the tilt lever 13 is rotated. It is rotated upward about P. At this time, the lock roller 22 is changed from the contact with the second recess 20c of the second cam plate 20 to the contact with the second sliding surface 20b, so that the lock roller 22 is pressed forward against the gravity to be the first. The cam plate 19 moves to the first concave portion 19d side and the front portion is fitted into the first concave portion 19d. When the tilt lever 13 is rotated backward, the lock roller 22 is rolled on the second sliding surface 20b while receiving a light pressure contact force due to gravity in the direction of the second sliding surface 20b of the second cam plate 20. .
Incidentally, a relationship of w <k ≦ w + h2 is established between the outer dimension k of the lock roller 22, the depth distance h2 of the first recess 19d, and the width distance w of the gap 21. Therefore, in this state, if the lifting lever 12 integrally formed with the first cam plate 19 is to be operated, the lock roller 22 is pushed rearward and tries to come out of the first recess 19d, but the second cam plate 20 The rearward movement is restricted by being in contact with the second sliding surface 20b. As a result, the lock roller 22 cannot be removed from the first recess 19d, so that the elevating lever 12 cannot be moved (operated). Therefore, when the tilt lever 13 is rotated backward, simultaneous operation of the elevating lever 12 is restricted.

As described above, when the tilt lever 13 is rotated forward or backward, the lock roller 22 cannot be fitted into the first recess 19d of the first cam plate 19 and cannot be removed. Simultaneous operation of the lift lever 12 is restricted.
Further, when the tilt lever 13 is rotated forward or backward, the lock roller 22 is rolled while abutting on the second sliding surface 20b in a light pressure contact state, so that the slide with the second cam plate 20 is performed. The resistance can be reduced, and the fine operability can be ensured so that the operation of the tilt lever 13 does not feel strange.
Note that the forward turning operation of the tilt lever 13 corresponds to the forward tilting operation of the mast, and the backward turning operation of the tilt lever 13 corresponds to the backward tilting operation of the mast.

The lever device 10 according to the embodiment of the present invention has the following effects.
(1) When the elevating lever 12 is rotated from the neutral position toward the front or the rear, the first cam plate 19 integrally formed with the elevating lever 12 is moved downward or upward about the rotation axis O. It is rotated. At this time, the lock roller 22 is fitted in the second concave portion 20c of the second cam plate 20 at the rear portion and abuts against the second concave portion 20c, while the front portion is slightly spaced from the first sliding surface 19c of the first cam plate 19. It is in a position facing through the distance g. Here, because of the relationship of 0 <g <h1, when the lifting lever 12 is rotated forward or backward, the lock roller 22 is fitted into the second recess 20c of the second cam plate 20 and comes out. Since this is not possible, simultaneous operation of the tilt lever 13 formed integrally with the second cam plate 20 is restricted. When the tilt lever 13 is rotated forward or backward from the neutral position, the second cam plate 20 formed integrally with the tilt lever 13 rotates downward or upward around the rotation axis P. Moved. At this time, the lock roller 22 moves to the first concave portion 19d disposed opposite to the second concave portion 20c, the front portion is fitted into the first concave portion 19d, and the rear portion is the second sliding surface 20b of the second cam plate 20. It will be in the state contacted. Here, because of the relationship of w <k ≦ w + h2, when the tilt lever 13 is rotated forward or backward, the lock roller 22 can be fitted into the first recess 19d of the first cam plate 19 and come out. Since this is not possible, simultaneous operation of the lifting lever 12 formed integrally with the first cam plate 19 is restricted. As described above, when the lift lever 12 is operated, the operation of the tilt lever 13 is restricted, and when the tilt lever 13 is operated, the operation of the lift lever 12 is restricted. Therefore, the simultaneous operation of the elevating lever 12 and the tilt lever 13 can be automatically controlled without performing a complicated operation.
(2) When the lifting lever 12 is rotated forward or backward, the first cam plate 19 formed integrally with the lifting lever 12 is moved downward or upward while maintaining the gap distance g with the lock roller 22. Since it is pivotable, fine operability can be ensured particularly during the pivoting operation of the lifting lever 12 that is frequently used.
(3) When the tilt lever 13 is rotated forward or backward, the lock roller 22 is rolled while abutting on the second sliding surface 20b in a light pressure contact state. The dynamic resistance can be reduced, and fine operability can be ensured so that the operation of the tilt lever 13 does not feel strange.
(4) The arm member 23 is suspended from above at an inclination angle α, and the lock roller 22 supported on the lower end portion of the arm member 23 has the second recess 20c or the second sliding surface 20b by gravity. Is in contact with. At this time, since the inclination angle α is set small, the surface of the lock roller 22 can be brought into contact with the second recess 20c in a light pressure contact state. Thus, since it can contact | abut using gravity, without using a special energizing means, the apparatus can be simplified.
(5) Since the roller 24 is rotatably supported by the shaft 24 via a bearing as the lock roller 22, the sliding resistance is further reduced when rolling on the second sliding surface 20b. Is possible.

The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the spirit of the invention. For example, the following modifications may be made.
In the embodiment of the present invention, a slight gap distance g is provided between the surface of the lock roller 22 and the first sliding surface 19c of the first cam plate 19, but this gap distance g = 0 (zero). It may be. In this case, the lock roller 22 is in contact with the first sliding surface 19c, and the lock roller 22 rolls on the first sliding surface 19c as the first cam plate 19 rotates. However, since the sliding resistance due to rolling is small, it is possible to ensure a fine operability at a level with no problem when the lifting lever 12 is turned.
In the embodiment of the present invention, it has been described that a restriction mechanism that restricts simultaneous operation of both levers is provided between the lift lever 12 and the tilt lever 13, but between the lift lever 12 and the side shift lever 14, or A regulating mechanism that regulates simultaneous operation of both levers may be provided between the tilt lever 13 and the side shift lever 14. When the lift lever 12 and the side shift lever 14 are provided, the operation of the side shift lever 14 is restricted when the lift lever 12 is operated, and the lift lever 12 is operated when the side shift lever 14 is operated. Operation is restricted. When the tilt lever 13 is provided between the tilt lever 13 and the side shift lever 14, the operation of the side shift lever 14 is restricted when the tilt lever 13 is operated, and the tilt lever is operated when the side shift lever 14 is operated. 13 operations are restricted.
In the embodiment of the present invention, it has been described that a restriction mechanism that restricts simultaneous operation of both levers is provided between the lift lever 12 and the tilt lever 13, but the lift lever 12 is between the lift lever 12 and the tilt lever 13. And a side shift lever 14 and between the tilt lever 13 and the side shift lever 14 may be provided with restriction mechanisms for restricting simultaneous operation of the levers. In this case, the operation of the tilt lever 13 and the side shift lever 14 is restricted when the lift lever 12 is operated, and the operation of the lift lever 12 and the side shift lever 14 is restricted when the tilt lever 13 is operated. . Further, when the side shift lever 14 is operated, the operations of the elevating lever 12 and the tilt lever 13 are restricted. Thus, when there are a plurality of operation levers, the restriction mechanism may be provided between any two operation levers.
In the embodiment of the present invention, the arm member 23 is slanted from above and the lock roller 22 is brought into contact with the second sliding surface 20b by gravity. However, as shown in FIG. Further, a coil spring 32 may be stretched between the hanging portion 31 of the fixing member 11 as a biasing member. In this case, for example, even when the vehicle tilts backward, the lock roller 22 can be stably brought into contact with the second sliding surface 20b by the biasing force of the spring without being affected by the tilt of the vehicle.
In the embodiment of the present invention, the first operation lever is the lifting lever 12 and the second operation lever is the tilt lever 13, but the first operation lever may be the tilt lever and the second operation lever may be the lifting lever.
Although the embodiment of the present invention has been described as being applied to a forklift, the present invention is not limited to a forklift, and may be applied to a construction vehicle including a first operation lever and a second operation lever, and other industrial vehicles such as a towing vehicle. .

DESCRIPTION OF SYMBOLS 10 Lever apparatus 12 Lifting lever 13 Tilt lever 19 1st cam plate 19c 1st sliding surface 19d 1st recessed part 20 2nd cam plate 20b 2nd sliding surface 20c 2nd recessed part 21 Gap | interval 22 Lock roller 23 Arm member (alpha) Arm member The tilt angle O of the lift lever and the pivot axis P of the first cam plate P The pivot axis of the tilt lever and the second cam plate

Claims (3)

A lever device in an industrial vehicle provided with a first operation lever and a second operation lever arranged in parallel to each other for handling a cargo,
The first operation lever and the second operation lever each include a first cam plate and a second cam plate,
The first cam plate and the second cam plate each have a first sliding surface recessed in an arc shape and a second sliding surface protruding in an arc shape,
The first sliding surface and the second sliding surface are arranged to face each other with a gap between them,
An engagement member is disposed in the gap so as to be able to contact the first sliding surface and the second sliding surface,
Forming a first engaged surface and a second engaged surface on which the engaging member is engaged with the first sliding surface and the second sliding surface,
The engaging member engages with the first engaged surface or the second engaged surface to regulate the operation from the neutral position of the first operating lever or the second operating lever,
When the first operating lever is operated, the engaging member engages with the second engaged surface to restrict the operation from the neutral position of the second operating lever;
In the industrial vehicle, wherein when the second operation lever is operated, the engagement member engages with the first engaged surface to restrict the operation from the neutral position of the first operation lever. Lever device.   The first operation lever is a lift lever, the second operation lever is a tilt lever, and the engagement member is disposed with a slight gap from the first sliding surface. The lever device in the industrial vehicle according to claim 1.   The lever device for an industrial vehicle according to claim 1 or 2, wherein the engaging member is a roller rotatably supported by a bearing on an arm member swingably attached to a vehicle body.