JPS6343534B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an agricultural trencher that does not obstruct the work of root vegetable diggers, prevents the side walls of dug trenches from collapsing, and allows root vegetables to be collected without being damaged. This relates to safety equipment.

Conventionally, when digging root vegetables such as burdock and yam using machines, a trencher was used to dig a trench right next to the crops to be dug, and an assistant worker harvested the crops. However, the side walls of the trench tend to collapse, which can cause damage to the crops.As a result, auxiliary workers may approach the excavation section of the trencher in an attempt to dig up the crop before the trench collapses, and accidentally touch the excavation chain, causing unexpected injury. It was a lot. For this reason, as shown in FIG. 1, a method has been adopted in which a guardrail 8 is attached as a safety device to the frame 1 of the trencher to prevent the auxiliary worker from accidentally touching the excavation chain 6. However, although the guardrail 8 prevents the auxiliary worker from accidentally touching the excavation chain 7, the guardrail 8 extends parallel to the ground, so it significantly obstructs the auxiliary worker's work and excavates. The reality is that the side walls of the grooves cannot be prevented from collapsing and are often removed during use, so they are not used at all.

An object of the present invention is to solve the above-mentioned problems and provide a safety device for an agricultural trencher that does not impede the excavation work and prevents the side walls of the excavated trench from collapsing.

To achieve this purpose, the safety device of the agricultural trencher of the present invention includes a digging chain arm that can be rotated up and down in a perpendicular plane according to the depth of the trench to be excavated, and a cutting chain arm that revolves around the digging chain arm. In an agricultural trencher equipped with an excavation chain for excavating trenches, the excavation chain is formed into a shape that follows the trajectory of the upper half of the excavation chain, and one end is fixed to the rotating shaft of the excavation chain arm via a connecting member. a guard arm, a fixed link member detachably fixed to the rear end of the guard arm in the direction of travel, and a plurality of pairs of links whose tips are warped inwardly of the excavated groove in the direction of trencher movement and press against the side walls of the groove. a guard plate; a plate support member rotatably supporting the plurality of pairs of guard plates within both a plane parallel to the side wall and a plane orthogonal to the parallel plane; and a plate support member rotatably supporting the plurality of pairs of guard plates. a plate pressing member interposed at each rear end portion and having a means for pressing each of the plurality of pairs of guard plates against the side wall; and a through hole provided in the plate pressing member passing through the fixed link member in parallel with each other. The guard plate unit is constituted by a link member that holds the plurality of pairs of guard plates parallel to each other and spaced apart, and the guard plate is rotatably attached to and detached from the other end of the guard arm according to the depth of the groove to be excavated. It is characterized in that it is fixedly fixed to the side wall of the excavated groove and is rotatably arranged parallel to the side wall of the excavated groove so as to press the side wall.

Embodiments of the safety device for agricultural trenchers of the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows an embodiment of the safety device for an agricultural trencher according to the present invention.

1 is a frame of the trencher, and 2 is a tire. The rotational motion of the lifting handle 3 of the excavation chain arm is converted into linear motion and transmitted to one end of the chain arm fixing member 5 using a link. The chain arm fixing member 5 is rotatably supported by the chain arm rotating shaft 4, and an excavating chain arm 6 is fixed to the other end. Therefore, the lifting handle 3
The excavation chain arm 6 can be freely raised and lowered by rotating forward and reverse, and the excavation chain 7 excavates a trench. This situation is shown in FIG. A guard arm connecting member 11 having a guard arm support wall 12 on its upper surface is fixed to the rotating end of the excavation chain arm 6. The guard arm support wall 12 is provided with arc-shaped groove holes 13 at the ends of both side walls, and the guard arm 9 interposed between the guard arm support walls 12 can be rotated in the same plane as the rotation plane of the chain arm 6. Support freely. The guard arm 9 is attached to the guard arm support wall 12 with a through bolt and nut passing through the slot 13.
Fix it in the desired position.

The guard arm 9 shown clearly in FIG. 4 is a member having a T-shaped cross section made by abutting two angle irons, and is formed in a shape along the trajectory of the upper half of the excavation chain. In order to fix the guard arm 9 to the guard arm support wall 12, a clamping portion is provided at the rotating end of the guard arm 9. A hole is provided in each clamping portion for the rotation shaft and through bolt to pass through. On the other hand, in order to removably fix the guard plate unit 10 at a desired position on the guard arm 9, a plurality of holes 30 are provided in parallel at appropriate intervals on the corresponding upper surface of the guard arm 9. Furthermore, in order to dredge the bottom of the excavated trench if necessary, the tip of the guard arm 9 is bent toward the excavation chain arm side, and a plate having a width approximately equal to the excavation width is fixed.

The guard plate unit 10 is shown in FIGS. 5 and 6. The guard plate unit 10 includes three pairs of guard plates 2 whose tips are curved inward of the grooves excavated.
0, a fixed link member 21 fixed to the upper surface of the guard arm, a link member 22, and a guard plate 2.
A hole 26 through which the link member 22 passes is provided with pressing springs 25 at both ends to press the rear end of the 0 outward.
and three plate support members 23 that support the plate 20 rotatably in two directions relative to the fixed link member 21.

The fixed link member 21 is a groove-shaped member made by abutting two angle irons. Two sets of holes 31 arranged in parallel at an appropriate interval are provided on the bottom surface of the fixed link member and fixed to the guard arm using a fastening means. This is to allow the guard plate unit 10 to be detachably attached to the guard arm 9 in accordance with the depth of the groove to be excavated at the attachment position.

A hole 32 through which the fixing pin 28 passes through one side of the angle iron
Two perforated members 27 provided with a plurality of holes are fixed to the inside of the plate 20 while being spaced parallel to each other in the longitudinal direction of the plate 20.

The guard plate 20 is rotatably supported around the axis of the plate support member 23 by the plate support member 23 passing through both side walls of the fixed link member 21 . Further, the plate support member 23 has cylindrical portions at both ends protruding outward from both side walls of the fixed link member 21, which are perpendicular to the plate support member 23 and are interposed between the perforated members 27 and through which the fixing pin 28 passes. This cylindrical portion supports the guard plate 20 rotatably around the axis of the fixing pin 28. A locking portion is made to protrude from this cylindrical portion at a distance parallel to the guard plate 20, restricting the rotational movement of the guard plate 20 about the axis of the fixing pin 28, and working together with the plate pressing member 24 as shown in FIG. The guard plate 20 is held with its rear end slightly open in the traveling direction A as shown in FIG.

The cylindrical portions at both ends of the plate support member 23 are interposed between the perforated member 27 of the guard plate 20, and the guard plate 20 is attached to the fixing pin 28 and the pin 29.
It is rotatably attached to the fixed link member 21 with.

A pressing member 24 having a hole 26 in the center thereof through which the link member 22 passes is interposed at the rear ends of the pair of guard plates to open the rear ends of the guard plates laterally.

Each link member 22 is passed through a hole in each pressing member 24 interposed between a pair of guard plates,
The guard plate unit 10 is configured as a parallel link.

This guard plate unit 10 is fastened to the guard arm 9 using bolts and nuts in accordance with the depth of the groove to be excavated. In yet another embodiment, as shown in FIG. 7, the side plate 14 is secured to the excavation chain arm.

In another embodiment, instead of the guard plate unit 10, as shown in FIG. 8, a guard plate 10' having a U-shaped cross section whose rear end is slightly opened outward with respect to the trencher advancing direction is fixed to the guard arm.

Next, the operation of the safety device for the agricultural trencher of the present invention will be described. Since the guard arm 9 is fixed to the excavation chain arm 6 by the guard arm connecting member 11, it rotates in conjunction with the rotational movement of the excavation chain arm 6. Further, the relative position of the guard arm 9 with respect to the excavation chain arm 6 can be slightly adjusted by loosening a through bolt and nut passing through the guard arm 9 and the slot 13 of the guard arm support wall 12. Therefore, the relative position of the guard plate unit 10 with respect to the excavation chain can be adjusted appropriately.

When the trencher excavates while proceeding in the direction of arrow A in FIG. It rotates as a unit and presses against the side wall of the excavated trench, preventing the side wall from collapsing. Furthermore, as shown in FIG. 7, if the side plate 14 is fixed to the side of the excavation chain arm, there is an effect of further suppressing collapse of the side wall. Further, unlike the conventional guardrail 8 which extends parallel to the ground far away from the excavation chain 7, the safety device of the present invention has a small distance from the excavation chain 7 and rotates together with the excavation chain close to the excavation chain.

In the agricultural trencher safety device of the present invention constructed in this manner, the guard arm and the guard plate unit rotate in conjunction with the excavation chain arm, so that the work of the auxiliary worker who harvests root vegetables is not obstructed. , to prevent auxiliary workers from accidentally touching the drilling chain. On the other hand, since the guard plate presses against the side walls of the excavated trench and prevents the side walls from collapsing, the root vegetables to be harvested are not damaged, and crops with high commercial value can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a trencher equipped with a conventional safety device, Fig. 2 is a side view of a trencher equipped with a safety device of the present invention, and Fig. 3 is a diagram showing a guard arm mounting portion of the safety device of the present invention. 4 is a plan view and a side view of the guard arm of the safety device of the present invention; FIG. 5 is a plan view and a side view of the guard plate unit of the safety device of the present invention; FIG.
The figure is an exploded perspective view of the guard plate unit of the safety device of the present invention, FIG. 7 is a diagram showing an embodiment of the safety device of the present invention with a side plate attached, and FIG. 8 is a diagram showing another safety device of the present invention. FIG. 3 is a side view of the equipped trencher. DESCRIPTION OF SYMBOLS 1... Frame, 2... Tire, 3... Lifting handle, 4... Chain arm rotating shaft, 5... Chain arm fixing member, 6... Excavation chain arm, 7... Excavation chain, 8... Guard rail ,
9... Guard arm, 10... Guard plate unit, 10'... Guard plate, 11... Guard arm connecting member, 12... Guard arm support wall, 13... Slot hole, 14... Side plate, 2
0... Guard plate, 21... Fixed link member, 22... Link member, 23... Plate support member, 24... Plate pressing member, 25... Pressing spring, 26, 30, 31, 32... Through hole , 27
...Perforated member, 28...Fixing pin, 29...Pin.

Claims (1)

[Claims] 1. An excavation chain arm 6 that can rotate up and down in a vertical plane according to the depth of the trench to be excavated, and an excavation chain 7 that goes around the excavation chain arm 6 to excavate the trench. An agricultural trencher comprising: a guard arm 9 formed in a shape along the trajectory of the upper half of the excavation chain 7, and one end of which is fixed to the rotation shaft 4 of the excavation chain arm 6 via a connecting member 11; , a fixed link member 21 detachably fixed to the rear end of the guard arm 9 in the advancing direction, and a plurality of pairs of guards whose tips are bent inwardly of the excavated groove and press against the side walls of the groove in the trencher advancing direction. a plate 10', a plate support member 23 that rotatably supports the plurality of pairs of guard plates 10' within both a plane parallel to the side wall and a plane perpendicular to the parallel plane; a plate pressing member 24 which is interposed in the rear end portion of each of the guard plates 10' and has a means for pressing each of the plurality of pairs of guard plates 10' against the side wall; and a through hole provided in the plate pressing member 24. and a link member 22 that passes through the fixed link member parallel to each other and holds the plurality of pairs of guard plates parallel to each other and spaced apart from each other, forming the guard plate unit, and the guard plate has a depth corresponding to the depth of the groove to be excavated. A safety device for an agricultural trencher, characterized in that the guard arm is detachably fixed to the other end of the guard arm so as to be rotatable in parallel with the side wall of the excavated trench so as to press the side wall.