JP2015040081A - Cargo handling lever retainer of industrial vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cargo handling lever retainer of an industrial vehicle which eliminates the need of complicated design and adjustment.SOLUTION: A cargo handling lever retainer of an industrial vehicle includes: a cargo handling lever for operating a cargo handling gear; a hydraulic pressure control valve 11 for cargo handling gear driving control; a joint bar 14 swingably connected with the cargo handling lever; a spool joint 22 connected with an area between the joint bar 14 and a spool 11a of the hydraulic pressure control valve 11; an engaged part 15 formed in the spool joint 22; and an engaging part which may engage with or disengage from the engaged part 15 and engages with the engaged part 15 at a neutral position of the cargo handling lever to lock the spool joint. The spool joint is connected with the spool so as not to swing and is swingably connected with the joint bar.

Description

  The present invention relates to a cargo handling lever fixing device for an industrial vehicle.

  Industrial vehicles such as forklifts are generally equipped with a mast or attachment for a cargo handling device in front of the vehicle body. The driver's seat is provided with a cargo handling lever and a control valve for operating them. The operating direction of the cargo handling device is determined by switching the spool of the hydraulic control valve with this cargo handling lever.

  FIG. 7 illustrates a side surface of a forklift as an example of an industrial vehicle. The cargo handling device 2 of the forklift 1 is provided with a fork 4 for loading a load on a mast 3 that can be tilted. The cockpit 5 of the forklift 1 is provided with a handle 8 for steering the steered wheels 7 and a cargo handling lever 9 for operating the cargo handling device 2 provided beside the steering wheel 8 in front of the seat 6. It has been.

  FIG. 8 shows the front side of the cockpit 5 of the forklift 1 of FIG. 7. In the illustrated example, the cargo handling lever 9 protruding from the front guard 5a includes a lift lever 9a for lifting the fork 4 and a mast. A tilt lever 9 b for performing the tilt operation 3 is provided on the side of the handle 8.

  In recent years, from the viewpoint of safety, a vehicle equipped with a safety device (interlock) that does not operate the cargo handling device 2 when the cargo handling lever 9 is operated without being seated on the seat 6 is being transferred.

  As a safety measure of this type, for example, as shown in FIG. 9, a cargo handling lever 9 rotatably supported on a shaft 10 and a spool 11a of a hydraulic control valve 11 are connected by a joint bar 14A by connecting pins 12 and 13. When the cargo handling lever 9 is in the neutral position, the locking portion (locking protrusion) 16 is locked to the locked portion (circumferential groove) 15A provided on the joint bar 14A, and the joint bar 14A is locked. A cargo handling lever fixing device that fixes the cargo handling lever 9 by locking is known (for example, Patent Document 1).

  The hydraulic control valve 11 switches the internal hydraulic port by moving the spool 11a connected to the joint bar 14A up and down, and operates the cargo handling device 2 driven by hydraulic pressure in a predetermined direction. In general, since the spool 11a is urged to return to the neutral position by a built-in return spring (not shown), the cargo handling lever 9 automatically returns to the neutral position when the operator releases the hand. It has become.

  As shown in FIG. 10, the locking portion (locking protrusion) 16 is provided at the tip of the plunger 18 of the solenoid 17, and when the seat switch 19 is on (that is, when seating is detected), the battery power source 20 supplies the solenoid 17. Current flows, the plunger 18 is moved against the spring force of the coil spring 21, and is separated from the locked portion 15 to be in an unlocked state.

  On the other hand, as shown in FIG. 11, when the seat switch 19 is off (that is, when not seated), the drive current from the battery power source 20 is cut off, and the plunger 18 is locked by the spring force of the coil spring 21. In the neutral position of the cargo handling lever 9, the locking portion 16 is locked to the locked portion 16, and the cargo handling lever 9 is fixed, that is, locked.

JP 2010-168204 A

  However, in the conventional cargo handling lever fixing device, as shown in FIG. 12, the joint bar 14 </ b> A moves up and down in the axial direction along with the shift operation of the cargo handling lever 9, and is displaced by a maximum angle θ around the pin 13. Produce. Therefore, the clearance between the locked portion (circumferential groove) 15 formed in the joint bar 14A and the locking portion (locking protrusion) 16 (see FIG. 10) for locking to the locked portion 15A. If the margin is not designed and adjusted in consideration of the θ angle, the lock may be released when the cargo handling lever is shifted in the locked state, which complicates design and adjustment. Furthermore, since the θ angle is different for each model, design and adjustment are required each time, and design and adjustment become complicated.

  Accordingly, the present invention provides a cargo handling lever fixing device for an industrial vehicle that eliminates the need for complicated design / adjustment of the clearance between the locked portion (circumferential groove) and the locking portion (locking protrusion) and the margin of engagement. The main purpose is to do.

  In order to achieve the above object, a cargo handling lever fixing device for an industrial vehicle according to the present invention includes a cargo handling lever for operating the cargo handling device, a hydraulic control valve for controlling the handling device drive, and swingable to the cargo handling lever. A coupled joint bar; a spool joint coupled between the joint bar and the spool of the hydraulic control valve; a locked portion formed on the spool joint; And a locking portion that can be locked at a neutral position of the cargo handling lever and lock the spool joint, and the spool joint is non-swingably connected to the spool. It is connected so that rocking | fluctuation is possible.

  Preferably, the spool joint is formed with a contact end face that comes into surface contact with the end face of the spool and restricts swinging with respect to the spool.

  According to the present invention, the spool joint connected between the joint bar and the spool is connected to the spool of the hydraulic control valve so as not to swing, and the locked portion is formed in the spool joint. Therefore, there is no need to consider the θ angle, and no complicated design / adjustment is required.

It is a disassembled perspective view which shows 1st Embodiment of the cargo handling lever fixing device of the industrial vehicle of this invention. It is a front view which shows a part of cargo handling lever fixing device of 1st Embodiment. The principal part of the cargo handling lever fixing device of 1st Embodiment is expanded and shown, (b) is a side view, (b) is a front view. The 2nd Embodiment of the cargo handling lever fixing device of this invention is shown, (A) is a side view only of the lower part of a joint bar, (B) is a principal part enlarged front view. It is a principal part expanded side view which shows other embodiment of the cargo handling lever fixing device of this invention. It is a principal part expanded side view which shows other embodiment of the cargo handling lever fixing device of this invention. It is a side view which shows the external appearance of the conventional forklift. It is the elements on larger scale which show the front side in the cockpit of the conventional forklift. It is a schematic block diagram which shows the conventional cargo handling lever fixing device. FIG. 10 is a partially enlarged view of the cargo handling lever fixing device of FIG. 9. It is a partially expanded view which shows the latching state of the cargo handling lever fixing device of FIG. It is the elements on larger scale of the cargo handling lever fixing device of FIG.

  A first embodiment of a cargo handling lever fixing device for an industrial vehicle according to the present invention will be described below with reference to FIGS. In addition, in the following description, the same code | symbol was attached | subjected to the same component through all drawings and other embodiment including the prior art example.

  FIG. 1 is an exploded perspective view of a cargo handling lever fixing device according to the present invention. As shown in FIG. 1, the cargo handling lever fixing device can swing on the cargo handling lever 9 for operating the cargo handling device 2 (see FIG. 7), a hydraulic control valve 11 for controlling the handling of the cargo handling device, and the cargo handling lever 9. A joint bar 14 coupled to the joint bar 14, a spool joint 22 coupled between the joint bar 14 and the spool 11a of the hydraulic control valve 11, a latched portion 15 formed on the spool joint 22, and a latched portion. 15 and a locking portion 16 (only a part of which is illustrated) that can be locked at the neutral position of the cargo handling lever, and the spool joint 22 cannot swing with the spool 11a, as will be described later. On the other hand, the joint bar 14 is swingably connected.

  As shown in FIG. 1, the cargo handling lever 9 is swingably supported by a shaft 10 that is horizontally mounted in a front guard 5 a (see FIG. 8) of the forklift 1. The cargo handling lever 9 is based on the lever principle, with the shaft 10 as a fulcrum and the gripping portion 9c as a power point, and the connecting portion by the pin 12 is the point of action. Via the pin 12, the cargo handling lever 9 and the upper end of the joint bar 14 are pivotably connected. In FIG. 1, reference numeral 23 denotes a β pin, reference numeral 24 denotes a washer, reference numeral 25 denotes a collar, reference numeral 26 denotes a bush, reference numeral 27 denotes a bolt, and reference numerals 28 and 29 denote mounting brackets.

  As shown in FIGS. 1 and 2, the upper end portion of the spool 11 a protrudes from the upper surface of the casing 11 b of the hydraulic control valve 11. As shown in an exploded view in FIG. 3, the upper end portion of the spool 11a is usually provided with a pin connecting bearing portion 11ab on a flat end surface 11af orthogonal to the axial direction of the spool 11a. A pin hole 11ac through which the connecting pin 13a (FIG. 1) is inserted is formed in the bearing portion 11ab.

  As shown in FIG. 3, the spool joint 22 is formed with a contact end surface 22a at the lower portion thereof to contact the end surface 11af of the spool 11a and restrict swinging with respect to the spool 11a when connected to the spool 11a. In the illustrated example, the contact end surface 22a is formed on the lower end surface of the spool joint 22, and specifically, is formed on the lower end surfaces of the pair of bearing portions 22b and 22b. The bearing portions 22b and 22b are formed with pin holes 22c through which the connecting pins 13a (FIG. 1) are inserted.

  Further, the spool joint 22 is formed with a bearing portion 22d for connecting the joint bar 14 so as to be swingable at an upper portion thereof, and the connecting pin 13b (FIG. 1) is inserted into the bearing portion 22d. Pin hole 22e is formed. In the joint bar 14, a pin hole 14 b for passing a connecting pin 13 b (FIG. 1) is formed in the bearing portion 14 a at the lower end.

  The spool joint 22 can have substantially the same diameter as the spool 11a, and can be configured to extend the spool 11a substantially upward.

  The locked portion 15 is formed by a circumferential groove formed on the peripheral side surface of the spool joint 22. As shown in FIG. 2, the locking portion 16 that is locked to the locked portion 15 is formed by a locking protrusion provided at the tip of the plunger 18 of the solenoid 17. For example, as shown in FIG. 1, the locking projections constituting the locking part 16 can be formed in a bifurcated shape that locks along the circumferential groove constituting the locked part 15.

  The locking portion 16, the solenoid 17, and the drive circuit thereof can employ the same configuration as that of the known technique (the above-mentioned Patent Document 1) shown in FIG. Therefore, the plunger 18 in FIG. 2 is urged by the spring 21 in the direction to be locked to the locked portion 15. When the cargo handling lever 9 is in the neutral position, the solenoid 17 detects when the seat switch 19 (see FIG. 10) mounted on the lower portion of the seat 6 (FIG. 7) of the driver's seat is turned on, that is, when the operator's seating is detected. Then, an electric current is applied to a coil (not shown) of the solenoid 17 to move the plunger 18 away from the locked portion 15 against the spring 21, and the locking portion 16 and the locked portion 15 are not locked (see FIG. 2). Status). Therefore, when the operator is seated, the cargo handling lever 9 can be operated. When the operator leaves the seat, the seat switch 19 is turned off, the plunger 18 is pushed out by the spring 21, the locking portion 16 is locked to the locked portion 15, and the spool joint 22 is locked. As a result, the cargo handling lever 9 becomes inoperable. Therefore, even if the operator is not seated on the seat 6, for example, when trying to operate the cargo handling lever 9 in the middle waist position, the cargo handling lever 9 cannot be moved.

  According to the cargo handling lever fixing device for an industrial vehicle having the above-described configuration, the spool joint 22 connected between the joint bar 14 and the spool 11a is connected to the spool 11a of the hydraulic control valve 11 so as not to be swingable. Since the engaged portion 15A is formed on the spool 22, the spool joint 22 moves only in the axial direction and does not tilt, so that it is not necessary to consider the tilt angle (θ angle) of the joint bar 14 as in the prior art, and is complicated. Design and adjustment are not required.

  Further, as shown in FIG. 3, when the upper end surface 11ad of the bearing portion 11ab of the spool 11a is a flat surface, a contact plane 22f that makes surface contact with the upper end surface 11ad of the bearing portion 11ab of the spool 11a is formed on the spool joint 22. It can also be provided.

  FIG. 4 is a second embodiment of the present invention, and shows a case where there are two bearing portions 11ab ′ of the spool 11a ′ and one bearing portion 14a ′ of the joint bar 14 ′. In this case, a spool joint 22 ′ having a configuration in which the spool joint 22 of FIGS. The spool joint 22 ′ includes a bearing portion 22b ′ inserted between the two bearing portions 11ab ′ and 11ab ′, and these bearing portions 11ab ′, 22b ′ and 11ab ′ are not shown in the drawings (the pins shown in FIG. 1). 13a) is connected to the pin holes 11ac 'and 22c'. When the bearing portion 22b 'is connected to the bearing portion 11ab' by the pin 13a, a contact plane 22a 'that is in surface contact with the flat end surface 11af' is formed at the lower end of the bearing portion 22b '. At the time of this connection, the spool joint 22 'can further be provided with a contact plane 22f' that comes into surface contact with the upper end surface 11ab 'of the bearing portion 11ac'. Thus, by connecting the bearing portion 11a and the bearing portion 22b 'with the pin 13a, the spool joint 22' is connected to the spool 11a 'so as not to swing. In the illustrated example, the position of the pin hole 22c 'is slightly different from that of the pin hole 22c in FIG. In the joint bar 14 ′ and the spool joint 22 ′, the bearing portion 14a ′ of the joint bar 14 ′ is inserted between the bearing portions 22d ′ and 22d ′ of the spool joint 22 ′, and the respective pin holes 22e ′ and 14b ′. A pin (not shown) (see the pin 13b in FIG. 1) is inserted into and connected to each other so as to be swingable.

  The connection mode is not particularly limited as long as the spool joint is connected to the spool so as not to swing. For example, in the first embodiment, the contact end surface 22a of the spool joint 22 is illustrated as being in surface contact with the end surface 11f of the spool 11a. However, for example, as shown in FIG. The swing of the spool joint 22X with respect to the spool 11a may be restricted by providing a plurality of protrusions 22p, contacting the end surface 11af of the spool 11a at a plurality of points or lines, and connecting with a pin (see the pin 13a in FIG. 1). Alternatively, as shown in FIG. 6, the lower part of the spool joint 22 </ b> Y may be coupled with a recess 22 y that can be fitted over the bearing 11 ab for connecting the spool 11 a from above.

  The form of the to-be-latched part and the latching part is not limited to the form of the first embodiment as long as both can be engaged and disengaged and the spool joint can be locked. For example, the locked portion is a through hole formed so as to be orthogonal to the axis of the spool joint 22, and the locking portion is in the form of a convex bar that can be fitted into the through hole constituting the locked portion. Can do.

9 Lever 11 Hydraulic control valve 11a Spool 14 Joint bar 15 Locked portion 16 Locked portion 22, 22 'Spool joint 22a, 22a' Contact end surface

Claims (2)

  A cargo handling lever for operating the cargo handling device, a hydraulic control valve for controlling the cargo handling device drive, a joint bar that is swingably connected to the cargo handling lever, and a joint bar and a spool of the hydraulic control valve A spool joint coupled to the spool joint, a latched portion formed on the spool joint, and capable of being engaged with and disengaged from the latched portion and locked at a neutral position of the cargo handling lever to lock the spool joint. A cargo handling lever fixing device for an industrial vehicle, wherein the spool joint is connected to the spool so as not to swing, and is connected to the joint bar so as to be swingable. . 2. The cargo handling lever fixing device for an industrial vehicle according to claim 1, wherein the spool joint is formed with a contact end surface that comes into surface contact with an end surface of the spool to restrict swinging of the spool joint.

Images