JP2770994B2 - Locking device for hydraulic operating lever in small excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for a hydraulic operating lever in a small shovel car, and more particularly to a locking device that enables the hydraulic operating lever to be easily fixed during transportation of a vehicle body.

2. Description of the Related Art

Conventionally, there is no small excavator in which obstacles are erected on the left and right and excavation work can be performed in a narrow place. In manufacturing such a small excavator, it is necessary to reduce the size of the vehicle body and to provide a hydraulic operating lever, a driver's seat, and the like. Then, a bonnet cover is attached to an upper portion of the body frame to cover an engine unit such as an engine and a hydraulic device. In manufacturing the small excavator, it is necessary to simplify the configuration of the hydraulic system in the bonnet frame in order to reduce the weight and size of the vehicle body. Further, when transporting the vehicle body, it is necessary to fix the hydraulic operating lever so that the hydraulic operating lever does not swing during transportation and the hydraulic device does not malfunction. As a means for fixing the hydraulic operating lever,
Published Japanese Patent Application No. 57-88223 (hereinafter referred to as the former) and Japanese Utility Model Application No. 6
One disclosed in Japanese Patent Application Laid-Open No. 2-103869 (hereinafter, referred to as the latter) is known. In the former locking device, brackets 2 and 2 are vertically provided on the left and right sides of the back surface of the floor plate 1 of the construction machine.
A support shaft 3 is pivotally supported therebetween, and the lower ends of a large number of operation levers 4, 4. … Together with this,
Also, fixed links 5, 5... Are provided on the side of the support shaft 3 facing the operation levers 4, 4,.
Lock groove 6 for engaging lock plate 9 on the lower surface of
6 ... are formed. The lock plate 9 is provided between the brackets 2 and 2 so as to be substantially parallel to the axis of the support shaft 3 and to be slidable along the axis, and is engaged with the lock grooves 6, 6. Are formed at predetermined intervals to prevent and lock the operation lever 4 from rotating, and when the operation lever 4 is rotated, the fixed link 5 Grooves 11 and 1 for escape
Are formed, and the engaging and disengaging operations are performed by sliding the lock plate 9 in the axial direction. Thus, as described above, the inside of the hood frame of the small excavator is very narrow, and the lock device provided with a lock device for the operation lever at the lower end portion of the operation lever is provided inside the hood frame of the small excavator. Is very difficult to provide. Further, in the latter locking device for the operation lever, a joint 3a is pivotally provided on the side of the control box 25 so as to be pivotable in the front-rear direction, and a U-shaped bracket 40 is externally fitted from above the joint 3a. 3a and bracket 40
Lock pin 41, which also serves as a rotation center axis of the operation lever 44
The bracket 40 is rotatable left and right around the lock pin 41.
The operation lever 44 is fixedly provided on the upper portion 40, and a pair of right and left lock pins 45 is fixedly provided on the side of the bracket 40 with an appropriate interval from the lock pin 41. A support shaft 55 having a lock lever 54 fixedly mounted on the lock pin 41, 45 side is pivotally mounted on the control box 25 via a sleeve 56. Further, the support shaft 55 has the lock pin 41, 45 A plate 59 having lock holes 57, 58 through which the plate 59 can be disengaged is fixed. Thus, the plate 59 is configured to rotate about the support shaft 55 by the operation of the lock lever 54 and to be disengaged from the lock pins 41 and 45 when the spring 60 passes the dead center. . Thus, as described above, the inside of the hood frame of the small excavator is very narrow, and the latter locking device provided with a locking device for the operating lever is provided on the side of the operating lever. It is extremely difficult to provide them inside. Therefore, there arises a technical problem to be solved in order to simplify the operation unit of the hydraulic system so that the locking device for the operation lever can be mounted in the bonnet frame of the small excavator. Aims to solve the problem.

[Means for Solving the Problems]

The present invention has been proposed to achieve the above object, and is a small shovel car, in which swing supporting points of left and right hydraulic operation levers provided on the small shovel car are provided in a bonnet frame. An arm plate fixed to the left and right hydraulic operation levers is provided near the upper portion of the swing fulcrum portion so as to be swingable integrally with the left and right hydraulic operation levers. A pin is separately protruded on each of the arm plates positioned above, and a pivot shaft is pivotally provided at a position above the pin, and a lock plate is fixedly attached to the pivot shaft to rotate vertically. Free to move,
A lock device for a hydraulic operating lever in a small shovel car having an engagement hole formed in the lock plate so as to be detachable from the pin, and a lock lever fixed to one end of a rotation shaft of the lock plate. It is another object of the present invention to provide a lock device for a hydraulically operated lever in a small excavator in which a distal end of the lock lever protrudes outward from a side surface of a bonnet cover.

[Action]

According to the present invention, the tip of the lock lever projects from the side surface of the hood cover of the small excavator. If the tip of the lock lever is gripped and the turning shaft is turned, the lock lever is fixed to the turning shaft. The lock plate is turned toward the arm plate. Then, the pin of the arm plate is engaged with the engagement hole of the lock plate, and the arm plate comes into contact with the lock plate. Accordingly, the movement of the arm plate is restrained, and since the arm plate is fixed at a position near the swing fulcrum, the swing of the hydraulic operating lever is also restrained and locked at the neutral position. Thus, the lock device of the present invention can be provided in the extremely narrow bonnet frame of the small excavator and at a position near the upper portion of the swing fulcrum of the hydraulic operation lever, which has a little space. . Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a small shovel car, in which a work boom (2) is provided at the front of an upper frame (1).
The crawler frames (4) and (4) are provided on both right and left sides of the upper frame (1). At the rear of the upper frame (1), there is provided a lower case (5), and on both left and right sides of the lower case (5), a shaft support (7) of a drive sprocket (6) (6).
In addition to the provision of (7), the respective shaft supports (7) and (7) are connected to the rear ends of the left and right crawler frames (4) and (4). Passive wheels (8) and (8) are pivotally mounted on the front ends of the left and right crawler frames (4) and (4), and crawlers (9) and (9) are provided between the driven sprockets (6) and (6). Wrap. Then, the engine (10) is mounted on the upper part of the mission case (5). On the upper part of the upper frame (1), a bonnet frame (11) is fixedly provided. The bonnet frame (11) will be described. A flat plate (12) is fixed to the upper surface of the engine (10) with a plurality of bolts (13) (13), and left and right columns (14, 14) are mounted on the rear upper surface of the plate (12). And support the rear part of the upper pipe (15) (15). The upper pipes (15) and (15) are disposed substantially horizontally from the left and right rear of the vehicle body to the front, respectively, and the rear ends thereof are connected by a connecting plate (16), and the upper pipes (15) and (15) A connecting pipe (17) is erected in the left and right direction at the front of the upper frame, and the upper pipes (15) and (15) are bent obliquely downward and bolted to the upper surface of the front of the upper frame (1). Have been. A connecting frame plate (1) is provided on the upper surface of the front part of the plate (12).
8), and as shown in FIGS. 2 and 3, the connecting frame plate (18) includes a left side plate (19) and a right side plate (20).
Are set up in parallel in the front-rear direction, and the rear portions of the left side plate (19) and the right side plate (20) are connected by a rear plate (21). Is formed. Then, the upper ends of the left and right side plates (19) and (20) and the connecting pipe (17)
A top plate (22) is erected between the top plate and the top plate, and a front plate (23) is welded to the front surfaces of the left and right side plates (19) and (20). (24) is erected. or,
The connecting frame plate (18) and the supporting plate (24) are provided with mounting seats (25), (25), (25), (25) and mounting holes (26), (26) for pivotally supporting each shaft described later. It is. 4 is a left side plate (19), FIG. 5 is a right side plate (20), and FIG. 6 is a support plate (24).
It is the side view of each which showed. As shown in FIG. 1, hydraulic devices such as hydraulic control valves (27), (27)... And a hydraulic pump (28) are fixed inside the thus constructed bonnet frame (11). The suspension hook (29) is bolted onto the top plate (22) of the connection frame plate (18). Then, a bonnet cover (30) is attached to the bonnet frame (11) to cover the engine section such as the engine (10), and the left and right hydraulic operation levers (31) and (31) are mounted on the upper surface of the bonnet cover (30). 31), various levers such as a traveling lever (32) (32), a sub-shift lever (33), and a step elevating lever (34) for forward / reverse switching are protruded. The left and right hydraulic operation levers (31) and (31) are swingable back and forth and left and right, and their swing fulcrums are provided on mounting seats (25) and (25) of the connection frame plate (18). The hydraulic operating lever (31) according to FIG. 7 and FIG.
If the mounting state of (31) is further explained, the arm plate (35) is provided at the lower end of the hydraulic operating levers (31) and (31).
(35) is fixed, and this arm plate (35) (3
At the lower part of 5), swing fulcrum parts (36) and (36) are provided, and the left and right side plates (19) of the connection frame plate (18) and the mounting seat (2) of (20) are provided.
5) Connected to (25). A plurality of the hydraulic pressure control valves (27) (27) are arranged side by side on the left and right, and their respective upper parts are fixedly mounted so as to be inclined rearward. The upper ends of the operation rods (37) (37) of each control valve are connected to the lower part of the arm plate (35) of the operation lever (31) and the pivot points (36) (36). Also, a shaft (38) is pivotally mounted between the mounting seat (25) below the right side plate (20) and the mounting seat (25) of the support plate (24), and one end of the shaft (38) is used for stepping up and down. The operation rod (37a) of the control valve (27a) is connected, and the other end of the shaft (38) is connected to the link (3).
It is connected to the step lifting lever (34) via 9). On the other hand, a rotating shaft (40) is pivotally mounted between the mounting hole (26) at the upper part of the right side plate (20) and the mounting hole (26) of the support plate (24). A lock plate (41) is fixedly mounted, and a lock lever (42) is attached to the other end of the rotating shaft (40).
Is fixed, and its tip protrudes outside through a long hole (43) opened in the side surface of the bonnet cover (30). As shown in FIG. 9, the arm plate (35) (3
On the upper surface of 5), pins (44) and (44) are provided upright between the left and right hydraulic operation levers (31) and (31), respectively. Engagement holes (45) and (45) are formed in the lock plate (41) at positions corresponding to the pins (44) and (44). Then, when the tip of the lock lever (42) is gripped and pressed in the direction of the arrow X in the figure and the rotation shaft (40) is rotated in the same direction, the lock plate (41) is moved to the left and right arm plates. (35) Attach to (35) and engage the locking hole (45) of the lock plate (41).
The pins (44) and (44) are inserted into and engaged with (45). Thus, the movement of the arm plates (35) (35) is restrained, and the swing of the left and right hydraulic operation levers (31) (31) is also fixed, so that the arm can be locked to the neutral position. The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified one. [Effects of the Invention] As described in detail in the above embodiment, the present invention provides an arm plate fixedly located near the swing fulcrum of the left and right hydraulic operation levers provided in the bonnet frame of a small excavator, The pins protruding from the respective arm plates are engaged with the engaging holes by the rotation of the lock plates. The lock plate can be easily rotated by a lock lever protruding from a side surface of the bonnet cover, and can be extremely easily and quickly locked from a normal operation position of an operator. Also in the hood frame
Since the range of movement of the hydraulic operating levers is small in the vicinity of the swing fulcrum of the left and right hydraulic operating levers, the configuration of the locking device is simplified, and the space can be effectively used, thereby reducing the size of the excavator. It is an invention which can contribute to.

[Brief description of the drawings]

Fig. 1 shows an embodiment of the present invention. Fig. 1 is a partially cutaway side view of a small shovel car, Fig. 2 is a side view of a main part of a connecting frame plate, and Fig. 3 is a front view of the main part. 4 is a side view of the left side plate, FIG. 5 is a side view of the right side plate, FIG. 6 is a side view of the support plate, FIG. 7 is a front view of a main part showing the structure of the hydraulic system, and FIG. FIG. 9 is a side view of the main part, and FIG. 9 is a perspective view of the main part of the locking device. (11) Bonnet frame (30) Bonnet cover (31) Hydraulic operating lever, (35) Arm plate (36) Swing fulcrum, (40) Rotating shaft (41) Lock plate, (42) Lock lever (43) Slot, (44) Pin (45) Engagement hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-51-105593 (JP, A) JP-A 57-88223 (JP, U) JP-A 62-103869 (JP, U) (58) Field (Int.Cl. ⁶ , DB name) E02F 9/16 E02F 9/20

Claims (2)

(57) [Claims] 1. A small shovel car, wherein swing fulcrums of left and right hydraulic operation levers provided on the small shovel car are provided in a bonnet frame, and the left and right hydraulic fulcrum parts are located near upper portions of the swing fulcrum parts. Arm plates respectively fixed to the hydraulic operating levers are provided so as to be swingable integrally with the left and right hydraulic operating levers, and pins are separately provided on the respective arm plates located between the left and right hydraulic operating levers. And a pivot shaft is pivoted above the pin, and a lock plate is fixed to the pivot shaft so as to be vertically rotatable, and an engagement hole is opened in the lock plate. A locking device for a hydraulically operated lever in a small excavator, wherein the locking device is formed so as to be detachable from the pin. 2. The lock plate according to claim 1, wherein a lock lever is fixed to one end of the rotation shaft of the lock plate, and a tip end of the lock lever projects outward from a side surface of the bonnet cover. A lock device for a hydraulic operating lever in the small excavator according to claim 1.