JP2019090223A - Operation confirmation device for movable drilling blade and enlarged drilling device including the same - Google Patents

Abstract

To provide an operation confirmation device for a reusable movable drilling blade and an enlarged drilling device including the same.SOLUTION: An operation confirmation device of a movable drilling blade applied to a drilling drill having a movable drilling blade and drilling the ground comprises a pedestal having a shaft hole, a pin having a shaft reciprocably inserted in the shaft hole, and which displaces from an initial position to an actuated position when the movable drilling blade performs a predetermined actuation, and holding means for holding the pin in the actuated position when the pin is displaced from the initial position to the actuated position.SELECTED DRAWING: Figure 5

Description

  The present disclosure relates to an operation confirmation device of a movable type drilling blade and a magnifying drilling device including the same.

When constructing a pile having an enlarged rooting portion, as disclosed in Patent Document 1, an enlarged drilling apparatus having a movable enlarged wing (excavating wing) is used. The expansion wing is rotatable between the diameter reduction state and the diameter expansion state, and the expansion drilling device is capable of excavating the shaft portion of the pile hole when the expansion wing is in the diameter reduction state. On the other hand, when the expansion blade is in the diameter expansion state, the expansion drilling apparatus can excavate the bottom of the pile hole.
And the expansion excavation apparatus which patent document 1 discloses is provided with the member for confirmation for confirming that the expansion wing became a diameter expansion state. The confirmation member is configured to be crushed by the expansion blade when the expansion blade is in the diameter expansion state, and the state of the confirmation member is confirmed after the expansion drilling apparatus is pulled up after digging the bottom portion. Thus, it can be checked whether or not the expansion blade has been expanded. That is, it is possible to confirm whether or not the enlarged bottom portion of the pile hole has been dug in view of the state of the confirmation member.

Patent No. 5605940

  The confirmation member disclosed in Patent Document 1 is disposable because it is crushed by the expansion wing and deformed irreparably, and must be replaced each time the excavation is performed. The replacement of the confirmation member is not only complicated but also costly.

  SUMMARY OF THE INVENTION In view of the foregoing, it is an object of at least one embodiment of the present invention to provide an operation confirmation device for reusable movable drilling blades and an enlarged drilling device including the same.

(1) An operation confirmation device of a movable type drilling wing according to at least one embodiment of the present invention,
In a movable drilling blade operation confirmation device applied to a drilling drill having a movable drilling blade and drilling the ground,
A pedestal having an axial hole;
A pin having a shaft portion reciprocably inserted into the shaft hole, the pin being displaced from an initial position to an operating position when the movable digging wing performs a predetermined operation;
Holding means for holding the pin in the actuated position when the pin is displaced from the initial position to the actuated position;
Equipped with

  According to the above configuration (1), since the pin is displaced to the working position by the operation of the movable digging blade and held in the working position by the holding means, by confirming the position of the pin, Operation can be confirmed. On the other hand, since the pin is only held by the holding means, the pin can be returned to the initial position again by releasing the holding by the holding means. For this reason, according to the above configuration (1), the operation confirmation device of the movable type digging wing can be repeatedly used without replacing the pin, and the digging operation can be smoothly advanced.

(2) In some embodiments, in the above configuration (1),
The holding means is
A cylindrical recess provided in the shaft of the pin;
And a cylindrical collar mounted in the recess.
The collar has a slit that axially traverses the collar to allow for elastic outer diameter changes of the collar.

  According to the above configuration (2), when the pin is displaced to the operating position, the outer diameter of the collar elastically changes, whereby the position of the pin is held by the collar. Therefore, according to the above configuration (2), the pin can be held at the operating position with a simple configuration.

(3) In some embodiments, in the above configuration (2),
The collar is capable of holding the pin in the actuated position by being pushed into the axial hole when the movable digging wing performs the predetermined actuation.

  According to the above configuration (3), the collar is pushed into the shaft hole as the pin is displaced to the actuating position, whereby the collar fits in the shaft hole and the pin is surely in the actuating position with a simple configuration. Can be held. In addition, the pin can be easily returned to the initial position by applying a force from the operating position to the initial position.

(4) In some embodiments, in the above configuration (2),
The collar is capable of holding the pin in the actuated position by being pushed out of the axial hole when the movable digging wing performs the predetermined actuation.

  According to the above configuration (4), the collar is pushed out of the shaft hole as the pin is displaced to the operating position, and the outer diameter of the collar becomes larger than the shaft hole, thereby preventing the pin from coming off and simplifying the configuration Can securely hold the pin in the operating position. Further, the pin can be easily returned to the initial position by reducing the diameter of the collar and pushing it into the shaft hole.

(5) In some embodiments, in the above configuration (1),
The holding means is
A convex portion provided to be able to project from one of the outer peripheral surface of the shaft portion of the pin and the inner peripheral surface of the shaft hole;
A recess which is provided on the other of the outer peripheral surface of the shaft portion of the pin and the inner peripheral surface of the shaft hole, and which can be fitted to the protrusion;
An elastic body urging the convex portion toward the concave portion;
When the pin is displaced from the initial position to the actuated position, the projection is fitted in the recess to hold the pin in the actuated position.

  According to the above configuration (5), since the convex portion biased by the elastic body fits in the recess, the pin can be reliably held in the operating position with a simple configuration. Further, the pin can be easily returned to the initial position by loosening the pressing force of the elastic body or elastically deforming the elastic body.

(6) The extended drilling apparatus according to at least one embodiment of the present invention is
Drilling drills with movable drilling blades to drill the ground,
The operation confirmation device for a movable type drilling wing according to any one of the above configurations (1) to (5) attached to the drilling drill;
Equipped with

  According to the above configuration (6), since the operation confirmation device for a movable type drilling blade according to any one of the above configurations (1) to (5) is attached to the drilling drill, the pin is not exchanged The operation confirmation device of the movable type drilling blade can be used repeatedly, and the drilling operation can be smoothly advanced.

  According to at least one embodiment of the present invention, there is provided an operation confirmation device for a reusable movable drilling blade and a magnifying drilling device comprising the same.

It is a side view showing roughly the expansion drilling equipment concerning one embodiment of the present invention. It is a schematic sectional drawing which follows an II-II line of the expansion drilling rig in a diameter-reduced state. It is a schematic sectional drawing in alignment with the II-II line of the expansion drilling rig in a diameter-expanding state. FIG. 3 is a schematic enlarged view of region IV of FIG. 2; It is a sectional view showing roughly a part of operation check device of a movable type excavation blade applied to an expansion drilling equipment. It is a perspective view which shows the pin used for the operation confirmation apparatus roughly. It is a perspective view showing roughly a collar used for operation check device. (A) is a schematic plan view of the operation confirmation device when the pin is in the initial position, and (b) is a schematic plan view of the operation confirmation device when the pin is in the operation position. It is a schematic sectional drawing equivalent to FIG. 5 of the operation confirmation apparatus which concerns on other one Embodiment of this invention. (A) is a schematic plan view of the operation confirmation device when the pin is in the initial position, and (b) is a schematic plan view of the operation confirmation device when the pin is in the operation position. It is a schematic sectional drawing equivalent to FIG. 5 of the operation confirmation apparatus which concerns on other one Embodiment of this invention. It is a schematic sectional drawing equivalent to FIG. 5 of the operation confirmation apparatus which concerns on other one Embodiment of this invention. It is a side view showing roughly the expansion drilling equipment concerning another one embodiment of the present invention. It is a side view showing roughly the expansion drilling equipment concerning another one embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely illustrative. Absent.
For example, a representation representing a relative or absolute arrangement such as “in a direction”, “along a direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” is strictly Not only does it represent such an arrangement, but also represents a state of relative displacement with an angle or distance that allows the same function to be obtained.
For example, expressions that indicate that things such as "identical", "equal" and "homogeneous" are equal states not only represent strictly equal states, but also have tolerances or differences with which the same function can be obtained. It also represents the existing state.
For example, expressions representing shapes such as quadrilateral shapes and cylindrical shapes not only represent shapes such as rectangular shapes and cylindrical shapes in a geometrically strict sense, but also uneven portions and chamfers within the range where the same effect can be obtained. The shape including a part etc. shall also be expressed.
On the other hand, the expressions "comprising", "having", "having", "including" or "having" one component are not exclusive expressions excluding the presence of other components.

  FIG. 1 is a side view schematically showing an enlarged drilling apparatus 1 according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken along the line II-II of the magnifying drilling device 1 in a diameter-reduced state. Drawing 3 is an outline sectional view which meets an II-II line of expansion drilling equipment 1 in a diameter expansion state. FIG. 4 is a schematic enlarged view of area IV of FIG. FIG. 5 is a cross-sectional view schematically showing a part of the operation confirmation device 3 of the movable type drilling blade applied to the expansion drilling device 1. FIG. 6 is a perspective view schematically showing the pin 5 used in the operation confirmation device 3. FIG. 7 is a perspective view schematically showing the collar 7 used in the operation confirmation device 3. 8 (a) is a schematic plan view of the operation confirmation device 3 when the pin 5 is in the initial position, and FIG. 8 (b) is a schematic view of the operation confirmation device 3 when the pin 5 is in the operation position. Plan view.

As shown in FIGS. 1 to 4, the expansion drilling apparatus 1 has a movable drilling blade 9 and a drilling drill 11 for drilling the ground, and an operation confirmation device of the movable drilling blade attached to the drilling drill 11 (Hereinafter, also simply referred to as operation confirmation device) 3.
For example, the drilling drill 11 has a screw 12, a rod 13 and a drilling bit 14. The screw 12 is integrally fixed around the rod 13 and a plurality of drill bits 14 are fixed to the lower end of the screw 12.

  In addition, the drilling drill 11 has a mechanical movable drilling blade 9. The movable drilling blade 9 has, for example, a drip shape in a plan view, and is swingably attached to the screw 12 of the drilling drill 11. More specifically, a notch is formed on the outer peripheral portion of the screw 12 at a predetermined height, and the movable excavating wing 9 is disposed in the notch. The swinging axis of the movable drilling blade 9 is parallel to the axial direction of the rod 13 of the drilling drill 11, and the movable drilling blade 9 can swing in a horizontal plane.

The drilling drill 11 is rotatable around the rod 13, and when rotating in one direction, the drilling drill 11 is in a contracted state as shown in FIG. 2, and the movable drilling blade 9 is along the circumferential direction of the rod 13. Placed horizontally. In this diameter-reduced state, the movable drilling blade 9 is accommodated in the notch of the screw 12, and the drilling drill 11 can dig the shaft of the pile hole.
On the other hand, when rotating in the reverse direction, as shown in FIG. 3, the drilling drill 11 is in the diameter-expanded state, and the movable drilling blade 9 is disposed along the radial direction of the rod 13. In this diameter-expanded state, the tip of the movable excavating blade 9 projects outward beyond the screw 12 in the radial direction of the rod 13, whereby the outer diameter of the drilling drill 11 becomes larger than in the diameter-reduced state, The drilling drill 11 can drill the bottom of the pile hole.

As shown in FIGS. 5 to 8, the operation confirmation device 3 has a pedestal 15, a pin 5, and a holding means.
The pedestal portion 15 is fixed to the drilling drill 11 and has an axial hole 19. For example, the pedestal portion 15 is made of metal and has a prismatic shape, and a cylindrical axial hole 19 penetrates the pedestal portion 15 straight. The pedestal portion 15 is attached to the screw 12 of the drilling drill 11 by welding. The pedestal portion 15 may be detachably fixed to the drilling drill 11 by a bolt or the like.

  The pin 5 has a cylindrical shaft 23 which is reciprocably inserted into the shaft hole 19 and interlocked to displace from the initial position to the working position when the movable digging wing 9 is actuated. When the movable drilling blade 9 is actuated, it is displaced from the reduced diameter state shown in FIG. 2 to the enlarged diameter state shown in FIG. 3, and the movable drilling blade 9 projects radially outward of the drilling drill 11 It is. The pin 5 is made of, for example, metal, but is configured not to be plastically deformed when the movable drilling blade 9 is operated.

In the present embodiment, the pin 5 has a cylindrical head portion 25 coaxial with and integral with the shaft portion 23, and the head portion 25 has an outer diameter larger than the diameter of the shaft hole 19. The head 25 is disposed outside the shaft hole 19 and is configured such that the movable digging wing 9 abuts on the head 25 to press the head 25 as the movable digging wing 9 operates. As a result, the shaft portion 23 of the pin 5 is pushed into the shaft hole 19, and the pin 5 is displaced from the rest position when the drilling drill 11 is in the reduced diameter state to the working position in the enlarged diameter state.
In the present embodiment, the movable digging blade 9 is configured to be in direct contact with the pin 5 by actuation of the movable digging wing 9, but via a transmission member that transmits the displacement of the movable digging blade 9 The pin 5 may be configured to be displaced indirectly.

The holding means includes a cylindrical recess 27 provided in the shaft 23 of the pin 5 and a cylindrical collar 7 mounted in the recess 27.
The recess 27 is formed by a circumferential groove having a square cross section provided on one end side of the shaft portion 23, that is, the head 25 side.
The collar 7 is made of, for example, metal, and a slit 31 is formed. The slit 31 longitudinally cuts the collar 7 in the axial direction, and has a width sufficient to allow the elastic outer diameter of the collar 7 to be changed. The collar 7 is fitted in the recess 27, and the relative displacement with respect to the shaft portion 23 is restricted by fitting in the recess 27. Specifically, when the collar 7 is in the free state, the inner diameter of the collar 7 is smaller than the outer diameter of the shank 23 and larger than the outer diameter of the recess 27. Further, the outer diameter of the collar 7 is larger than the outer diameter of the shaft portion 23. Accordingly, the collar 7 fitted in the recess 27 moves together with the shaft 23 of the pin 5.

  Furthermore, the collar 7 has an outer diameter greater than the inner diameter of the axial bore 19 when in the free state, and when the movable drilling blade 9 is actuated the axial bore 19 together with the shank 23 of the pin 5. The pin 5 can be held in the actuated position by being pushed inward. That is, when the collar 7 is pushed into the shaft hole 19 while being reduced in diameter, the outer peripheral surface of the collar 7 slides on the inner peripheral surface of the shaft hole 19 and the collar 7 is held in the shaft hole 19 by frictional force. . Since the collar 7 is fitted in the recess 27 of the pin 5, the pin 5 is also held in the pushed-in position, i.e. in the working position.

According to the above configuration, a force (operating force) acts in the axial direction of the pin 5 by the operation of the movable digging wing 9, and the pin 5 is displaced to the operating position. And since the pin 5 is held at the operating position by the holding means, the operation of the movable digging wing 9 can be confirmed by confirming the position of the pin 5. On the other hand, since the pin 5 is only held by the holding means, the pin 5 can be returned to the initial position again by releasing the holding by the holding means. For example, the pin 5 can be returned to the initial position by applying an impact force (return force) to the other end side of the shaft 23 of the pin 5 with a hammer or the like.
For this reason, according to the above configuration, the operation confirmation device 3 of the movable type digging wing can be repeatedly used without replacing the pin 5, and the digging operation can be smoothly advanced.
The displacement amount of the pin 5 between the operating position and the initial position may be set to such an extent that the operator can visually confirm it. For example, the head 25 of the pin 5 abuts on the pedestal 15 The position can be an operating position, and the position where the head 25 of the pin 5 is away from the pedestal 15 can be an initial position. In order to make it possible to confirm the displacement of the pin 5 more reliably, the pin 5 or the collar 7 may be provided with a mark or the like for indicating an operating position or an initial position.

Hereinafter, other embodiments according to the present invention will be described. The same or similar configuration as the above-described configuration will be assigned the same name or symbol and the description will be omitted or simplified.
FIG. 9 is a schematic cross-sectional view corresponding to FIG. 5 of the operation confirmation device 33 according to another embodiment of the present invention. 10 (a) is a schematic plan view of the operation confirmation device 33 when the pin 5 is in the initial position, and FIG. 10 (b) is a schematic view of the operation confirmation device 33 when the pin 5 is in the operation position. Plan view.

As shown in FIGS. 9 and 10, in the present embodiment, the recess 35 is provided on the other end side of the shaft portion 23, and when the pin 5 is in the initial position, the collar 7 is reduced in diameter by the shaft hole 19. In the locked state (bound state). On the other hand, when the pin 5 is displaced to the operating position, the collar 7 comes out of the shaft hole 19 and becomes free, and the outer diameter of the collar 7 is enlarged. Once the outer diameter of the collar 7 is increased, it is difficult to push the collar 7 into the axial hole 19 again with slow axial force. Thus, the collar 7 can hold the pin 5 in the actuated position by being pushed out of the axial hole 19 when the movable digging wing 9 is actuated.
On the other hand, in order to return the pin 5 to the initial position, for example, an impact force (return force) is applied to the other end side of the shaft portion 23 of the pin 5 with a hammer or the like to forcibly reduce the diameter of the collar 7 and push it. Alternatively, the collar 7 may be pushed into the shaft hole 19 while reducing the diameter thereof.

FIG. 11 is a schematic cross-sectional view corresponding to FIG. 5 of the operation confirmation device 37 according to another embodiment of the present invention.
In the operation confirmation device 37, a lateral hole 39 communicating with the shaft hole 19 so as to be orthogonal to the axial hole 19 is provided in the pedestal portion 15, and the lateral hole 39 is closed by a screw 41. A ball 43 and a compression coil spring 45 are disposed between the screw 41 and the shaft 23 of the pin 5, and the compression coil spring 45 presses the ball 43 against the shaft 23.
The shaft portion 23 is formed with a circumferential groove 47 having a semicircular cross section, and the ball 43 is fitted to the circumferential groove 47 when the pin 5 comes to the operating position.

According to the above configuration, the holding means urges the circumferential groove (concave portion) 47 formed in the shaft portion 23, the ball (convex portion) 43 that can be fitted with the circumferential groove 47, and the compression coil spring It comprises an (elastic body) 45 and a screw (adjusting body) 41 for adjusting the pressing force of the compression coil spring, and the pin 5 can be held at the operating position also by the holding means.
When releasing the holding of the pin 5, the other end side of the shaft portion 23 of the pin 5 located on the opposite side to the head 25 is hit with a hammer or the like to apply an impact force, and the compression coil spring 45 is contracted. Alternatively, the screw 41 may be loosened to reduce the pressing force of the compression coil spring 45.
In the present embodiment, the seal ring members 49 are disposed on both sides of the ball 43 in the axial direction of the shaft hole 19 in order to prevent the soil and the like from infiltrating into the shaft hole 19. It is preferable to fill the gap between a certain axial hole 19 and the shaft 23 of the pin 5 with grease.

Further, in the above configuration, the projection 43 is provided so as to be able to project from the inner peripheral surface of the shaft hole 19 toward the recess 47 formed on the outer peripheral surface of the shaft 23 of the pin 5. A protrusion may be provided so as to be able to project from the outer peripheral surface of 23 toward the inner peripheral surface of the shaft hole 19. In this case, a radial hole may be provided in the pin 5 and the ball and the compression coil spring may be disposed in the radial hole. Then, a circumferential groove may be formed on the inner peripheral surface of the shaft hole 19 as a recess.
That is, a protrusion can be provided so as to be able to project from one of the outer peripheral surface of the shaft portion 23 of the pin 5 and the inner peripheral surface of the shaft hole 19 to the other, Good. Then, an elastic body may be provided to bias the convex portion toward the concave portion.

FIG. 12 is a schematic cross-sectional view corresponding to FIG. 5 of the operation confirmation device 51 according to another embodiment of the present invention.
The operation confirmation device 51 differs from the operation confirmation device 3 in that it has an annular washer 53 as an adjustment member for adjusting the operation position. The outer diameter of the washer 53 is larger than the inner diameter of the shaft hole 19 and the outer diameter of the head 25 of the pin 5, and the washer 53 is fitted on the head 25 side of the shaft 23. In the operation confirmation device 51, the operation position of the pin 5 can be adjusted by the washer 53 being sandwiched between the head 25 and the pedestal portion 15. In other words, by adjusting the operating position of the pin 5 with the washer 53, the swing angle of the movable digging blade 9 can be regulated, and the outer diameter of the drilling drill 11 in the enlarged diameter state can be adjusted.

  According to the above configuration, the washer 53 can easily adjust the outer diameter of the drilling drill 11 in the enlarged diameter state. In addition, the outer diameter of the drilling drill 11 in the diameter-expanded state can also be adjusted by selectively using the pins 5 having the head portions 25 having different heights without using the washers 53.

FIG. 13 is a side view schematically illustrating a magnifying drilling apparatus 54 according to another embodiment of the present invention.
The magnifying drilling device 54 differs from the magnifying drilling device 1 in that the swing axis of the movable drilling blade 9 is inclined with respect to the axial direction of the rod 13 of the drilling drill 11. In this case, the movable digging blade 9 is disposed along the spiral direction of the screw 12 in the reduced diameter state, and protrudes outward from the screw 12 in the enlarged diameter state.

FIG. 14 is a side view schematically showing an enlarged drilling apparatus 55 according to another embodiment of the present invention.
The magnifying drilling device 55 differs from the magnifying drilling device 1 in that the drilling drill 57 has a hydraulic movable drilling blade 59. In the expansion drilling device 55, the movable drilling blade 59 is disposed such that the swing axis of the movable drilling blade 59 in an arm shape coincides with the direction orthogonal to the axial direction of the rod 61 of the drilling drill 57 The wing 59 is swingable in the vertical plane. The movable excavating wing 59 is disposed along the rod 61 in the reduced diameter state, and tilts with respect to the rod 61 so that the lower end projects outward in the radial direction of the rod 61 in the expanded diameter state. The operation confirmation device 3 is attached to the drilling drill 57 such that the pin 5 is positioned at the operating position by the operation of the movable drilling blade 59.
Also in the above configuration, the operation confirmation device 3 of the movable type digging wing can be repeatedly used without replacing the pin 5, and the digging operation can be smoothly advanced.

Finally, the present invention is not limited to the above-described embodiments, and includes the embodiments in which the above-described embodiments are modified, and the embodiments in which these embodiments are appropriately combined.
For example, in the embodiment described above, the pedestal portion 15 provided separately from the drilling drills 11 and 57 is fixed to the drilling drills 11 and 57 by welding or the like, but according to the shape and arrangement of the movable drilling blades 9 and 59 Alternatively, a part of the drilling drills 11 and 57, for example, a part of the rods 13 and 61 may be used as the pedestal. In this case, an axial hole may be provided in the rods 13 and 61, and the axial portion 23 of the pin 5 may be inserted into the axial hole.

1, 54, 55 Enlargement drilling equipment 3, 33, 37, 51 Operation confirmation device of movable drilling blade 5 Pin 7 Collar 9, 59 Movable drilling blade 11, 57 Drilling drill 12 Screw 13, 61 Rod 14 Drilling bit 15 Base Portion 19 Shaft hole 23 Shaft portion 25 Head 27, 35 Recess 31 Slit 39 Lateral hole 41 Screw 43 Ball 45 Compression coil spring 47 Circumferential groove 49 Seal ring material 53 Washer

Claims (6)

In a movable drilling blade operation confirmation device applied to a drilling drill having a movable drilling blade and drilling the ground,
A pedestal having an axial hole;
A pin having a shaft portion reciprocably inserted into the shaft hole, the pin being displaced from an initial position to an operating position when the movable digging wing performs a predetermined operation;
Holding means for holding the pin in the actuated position when the pin is displaced from the initial position to the actuated position;
An operation confirmation device for a movable type drilling blade characterized by comprising: The holding means is
A cylindrical recess provided in the shaft of the pin;
And a cylindrical collar mounted in the recess.
The operation confirmation device for a movable type digging wing according to claim 1, wherein the collar has a slit which longitudinally cuts the collar in the axial direction to allow an elastic outer diameter change of the collar. The movable collar according to claim 2, wherein the collar is capable of holding the pin in the operating position by being pushed into the shaft hole when the movable drilling blade performs the predetermined operation. Operation confirmation device of the drilling blade. The movable collar according to claim 2, wherein the collar is capable of holding the pin in the operative position by being pushed out of the shaft hole when the movable excavation blade performs the predetermined operation. Operation confirmation device of the drilling wing. The holding means is
A convex portion provided to be able to project from one of the outer peripheral surface of the shaft portion of the pin and the inner peripheral surface of the shaft hole;
A recess which is provided on the other of the outer peripheral surface of the shaft portion of the pin and the inner peripheral surface of the shaft hole, and which can be fitted to the protrusion;
An elastic body urging the convex portion toward the concave portion;
When the pin is displaced from the initial position to the actuated position, the protrusion is fitted in the recess to hold the pin in the actuated position.
The operation confirmation device of the movable type drilling blade according to claim 1 characterized by things. Drilling drills with movable drilling blades to drill the ground,
The operation confirmation apparatus for a movable type drilling wing according to any one of claims 1 to 5, which is attached to the drilling drill.
An enlarged drilling apparatus comprising:

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