JP3230183B2 - Labor-saving excavator for deep digging - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shovel used for civil engineering work requiring relatively small diameter and deep holes, such as outer fence construction and pillar construction of signboards, etc., by human power.

[0002]

2. Description of the Related Art At present, when a relatively small-diameter and deep hole is excavated by human power, the excavator is excavated with a narrow-width, long-handled shovel and landed by two shovels or movably connected at a fulcrum. Digging with a so-called double-handled shovel composed of two opposed cutting blades and two handles directly connected to it, opening the handle to the left and right, sandwiching a drilling material between the two cutting blades, and discharging Is used.

[0003]

When excavating with a long-handled excavator, there is a problem that it is difficult to discharge the soil and the working efficiency is low. In addition, even if both excavators are used, the diameter of the excavator must be made larger than necessary to reach the upper part of the hole in order to secure a space to expand the handle when unloading, and not only the work efficiency decreases In addition, there is a problem that the supporting force of the fence or the pile fitted and held in the excavated hole is small. In addition, it takes a considerable amount of power to open the handle to the left and right and pull it up while holding the drilling material, especially when shaving with both excavators, especially when cobblestones are mixed in the drilling material In such a case, there is a problem that the discharge is difficult.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and the means is that the handle of a conventional double handle shovel is a single pipe and is provided in the pipe. By moving the rod in the axial direction by operating a lever provided at the upper part of the pipe, two opposing cutting blades rotatably attached to the lower part of the pipe at a fulcrum can be opened and closed.

[0005] Excavation is performed with the lever in a position where the cutting blade is opened substantially in parallel, and by operating the lever to a position where the cutting blade closes, the drilled material is held by the cutting blade and the upper diameter of the hole is enlarged. It is intended to provide a deep digging shovel that enables unloading without digging. Furthermore, by providing a ratchet stopper on the lever, it is possible to provide a labor-saving type deep digging shovel in which the cutting blade does not need to continuously apply human power for holding the drilled material during the unloading operation. .

[0006]

Embodiments of the present invention will be described below with reference to examples. 1 to 4 show an embodiment of the present invention, and FIG. 1 is an external view of the embodiment, showing names of respective parts. FIG. 2 shows the principle of operation of closing the cutting blade for landing. FIG. 3 is a drawing showing the operation principle of returning the cutting blade to the excavation position. FIG. 4 is a sectional view showing the structure inside the handle. In FIG. 1, two opposing cutting blades are rotatably mounted on a hinge fixed to the lower end of a hollow handle by a fulcrum in a plane parallel to the paper surface. The cutting blade is composed of a curved surface for holding excavated material such as excavated earth and sand and a blade at the tip thereof. A lever is attached to the upper end of the handle so as to be rotatable about a fulcrum in a plane parallel to the paper surface. The handle penetrates and has a rod, and the link fixed to the cutting blade and the arm portion of the lever are rotatably connected by a plane parallel to the paper surface.

In FIG. 2, when the lever is pushed down, the arm rises, the rod connected thereto is lifted up, and the cutting blade can be closed via the link. Can be discharged. A ratchet mechanism (10) is provided at the fulcrum of the lever, and the cutting blade can be closed with the force amplified by the principle of lever expected at the ratio of lever and arm,
Once the lever is pushed down, the ratchet mechanism ▲ 10 ▼
Thereby, the closed state of the cutting blade is maintained, and it is not necessary to continuously apply the force for closing the cutting blade during the discharging, and the power saving of the discharging is achieved.

Further, as is apparent from FIG. 2, the link and the rod are formed by a long hole formed in the link and a pin which is fitted in the long hole and is movable in the longitudinal direction of the long hole. The upward movement is converted into the closing movement of the cutting blade. FIG. 3 shows a state in which the latch release lever is operated to release the lever, the boring material held by the cutting blade is removed, and the cutting blade is returned to the original excavation state,
A hole of the expected diameter can be deeply drilled at a distance between two opposing cutting edges. The embodiment is an example of the present invention, and it is needless to say that the mechanism can be changed or improved within the range of the operation principle of the present invention.

[0009]

As described above, according to the present invention, a deep hole having a large supporting force such as a fence or a pile can be efficiently excavated without unnecessarily widening the upper part of the hole. In addition, since the gripping force of the boring material by the cutting blade is strong and the force is maintained without continuously applying human power, it is possible to laborlessly perform the unloading work even on the soil ground mixed with cobblestones. It is also effective not only for excavating deep holes, but also for removing sediment deposited on manhole bottoms and digging yams.

[Brief description of the drawings]

FIG. 1 is an external view of an embodiment, showing the names of various places.

FIG. 2 is a view showing an operation principle of closing a cutting blade for landing.

FIG. 3 is a view showing an operation principle of returning a cutting blade to an excavation position.

FIG. 4 is a sectional view showing a structure in a handle.

[Description of Signs] Cutting Blade Link Hinge Handle Rod Rod Joint Arm Lever 9 Latch Release Lever ▲ 10 ▼ Ratchet

Claims (1)

(57) [Claims] 1. A hinge fixed to one end of a single hollow handle.
And two opposing pivotally mounted two fulcrums
Two cutting blades and a lever attached to the other end of the handle with a fulcrum.
A rod penetrating through the hollow handle is provided for operating the lever.
Movably connected in the axial direction and fixed to the cutting edge or cutting edge
The hole that was drilled in the link and the rod that was drilled
With a pin that can be moved in the longitudinal direction of the long hole
By connecting the cutting blade with the
The opening and closing rotation of the cutting blade enables the movement of the lever to close the cutting blade.
It is fixed by the ratchet mechanism and the ratchet release
It is designed to be opened by a bar.
Labor-saving excavator for deep digging.