JPH0355644Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention is a drilling machine in which the upper end of a spiral drill is connected to the lower end of a vertical rotating shaft that is rotated by the drive of a prime mover. This is related to.

(b) Prior art and problems to be solved Conventionally, in this type of hole-drilling machine, the drill bits into the soil at the end of drilling to a predetermined depth, making it difficult to pull out the drill. Ta.

(c) Means and action for solving the problem The present invention is provided with a ground plate that is fixed integrally with the bearing part that supports the rotary shaft and comes into contact with the ground surface at the end of the drilling of the drill. When the ground plate contacts the ground surface at the end of drilling, it prevents the engine from rotating in the opposite direction and shears the soil around the outside of the drill, making it easier to pull out the drill.

(d) Embodiment Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, numeral 1 indicates a hole digging machine, which is constructed as follows. In other words, 3 is the support frame 5
7 is a crankcase, 9 is a cylinder cover that covers a cylinder (not shown), 11 is a muffler cover, and 13 is a fuel tank. Reference numerals 15 and 15 indicate a handle 17 for holding the support frame 5 and a grip portion fixed to the support frame 5. A gear case 19 is fixed to the crankcase 7, and a rotating shaft 25 is vertically supported in a lower bearing portion 21 via a bearing 23. A drill 27 is fixed to the lower end of the rotary shaft 25. A spiral plate 31 having a cutting edge 30 at the lower end is provided around the drill shaft 29, and the gear in the gear case 19 (see FIG. (not shown). 33 is a cylinder welded to the upper end of the drill shaft 29;
The lower end of the bolt 35 is fitted and penetrates horizontally.
It is fixed by. 37 is an inner cylinder that fits on the outer periphery of the bearing part 21 and is fixed with a bolt 39; 41 is an outer cylinder that fits on the outer periphery of the inner cylinder 37 so as to be vertically slidable; Through the inner cylinder 3
It is fixed in an appropriate position by a bolt 45 that is screwed into 7. 47 is a ground plate horizontally welded to the lower end of the outer cylinder 41. The inner cylinder 37 has a plurality of open windows 49, and a column 51 is formed between them. Further, the outer cylinder 41 has a plurality of open window portions 53, a support portion 55 is formed between the windows, and a long hole 43 is formed in the support portion 55. 57 is a long hole 43 provided in the outer cylinder 41
, an engagement hole 59 penetrating the inner cylinder 37, and a rotating shaft 2.
5 is engaged with an engaging hole 61 through a penetrating locking rod, if necessary.

In the above embodiment, the operator drives the engine 3, grips the grips 15, 15, and drills into the ground with the blade 30 of the rotating drill 27. Depending on the drilling depth, pre-install the bolt 45.
Adjust the position of the ground plate 47 by loosening it, and fix the outer cylinder 41 and the ground plate 47 with bolts 45. When the drilling depth reaches a predetermined depth, the ground plate comes into contact with the ground, and the engine 3 side is prevented from rotating in the opposite direction due to ground resistance, and on the outer periphery of the spiral plate 31,
The soil is sheared and the drill 27 can be easily pulled out. If the biting force is strong and the rotational force of the engine 3 is insufficient, causing the engine 3 to stop or the clutch to idle, stop the engine 3 and insert the locking rod 49 into the elongated hole 43 and the engaging The grip portions 15 and 1 are engaged through the holes 51 and 53.
5 with both hands and rotated in the opposite direction, the drill 27 can be manually rotated in the opposite direction and extracted.

(e) Effect of the invention Since the present invention has the configuration as described in the claims, the drill can be easily pulled out without digging into the soil at the end of the drilling, and The depth can be set to a predetermined depth.

In addition, in the present invention, the term "fixed integrally with the bearing" does not mean only those that are fixed directly to the bearing.
This also includes structures that are indirectly and integrally fixed to each other via the engine or via the engine and a support frame.

In the present invention, the ground plate 47 may be fixed at a constant height position, or may be provided vertically slidably between the inner cylinder 37 and the bearing portion 21.

Further, the lower surface of the ground plate 47 may be provided with a protrusion or a recess so that it is difficult to rotate with respect to the ground.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented in other embodiments as well. Further, the symbols shown in the claims do not limit the technical scope of the present invention.

[Brief explanation of drawings]

Fig. 1 is a perspective explanatory view of one embodiment of the present invention;
The figure is a side sectional view of the main part. 3... Prime mover, 21... Bearing section, 25... Rotating shaft, 27... Drill, 47... Ground plate.

Claims (1)

[Scope of utility model registration request] In a drilling machine in which the upper end of a spiral drill 27 is connected to the lower end of a vertical rotating shaft 25 that is rotated by the drive of a prime mover 3, the shaft is integrally formed with a bearing part 21 that pivotally supports the rotating shaft 25. A hole excavator characterized in that a ground plate 47 is provided, which is fixed to the ground plate 47 and comes into contact with the ground surface at the end of drilling with the drill 27.