JP5707209B2 - Surveying pole - Google Patents

Description

  In the present invention, a reflection prism that reflects the measurement light from the surveying instrument and returns it to the measurement light is provided in the middle between the upper end and the lower end of the saddle member, and a marking mechanism is provided at the lower end. Related to surveying poles.

  2. Description of the Related Art Conventionally, a surveying pole is known in which a reflecting prism is provided in the middle between an upper end portion and a lower end portion of a saddle member. In this device, a surveying worker specifies a survey point while holding and carrying the survey pole, and a survey pole is set up vertically at the survey point, and a marking member such as a nail is placed at this survey point.

  There is also known a surveying pole having a configuration in which a reflecting prism is provided at the upper end of the saddle member, a stand is provided at the lower end of the surveying pole, and the tip of the saddle member is pierced perpendicularly to the measurement point. (For example, refer to Patent Document 1).

US Pat. No. 4,803,784 (see abstract, etc.)

  By the way, if the surveying pole is tilted obliquely, the distance from the surveying instrument to the surveying pole cannot be measured accurately, and consequently the measuring point cannot be specified accurately. Therefore, the surveying pole is required to be vertical (vertical) to the ground, that is, the measurement point, when specifying the measurement point.

  In order to achieve this object, it is conceivable to use a gimbal mechanism between the gripping portion of the surveying pole and the heel member. By adopting this gimbal mechanism, it is possible to suspend the surveying pole when carrying it, and to direct the surveying pole vertically with respect to the ground by its own weight.

However, when marking is performed by specifying a measuring point, it is necessary to integrate the gripping part and the heel member so that the surveying pole can be pressed against the measuring point in a stable posture. .
In addition, it is necessary to devise the gimbal mechanism so that the gimbal mechanism is not damaged when marking the measurement point.

  An object of the present invention is to provide a surveying pole that can be suspended when being carried and can be pressed against a measuring point in a stable posture during marking.

A surveying pole according to claim 1 includes a reflecting prism provided between an upper part and a lower part of a saddle member, a marking mechanism provided at a lower part of the saddle member and marking a survey point, A gimbal mechanism provided on an upper part of the eaves member to hang down the eaves member by its own weight;
The gimbal mechanism includes an inner support member that is linked to the saddle member and supports the saddle member so as to be swingable in a predetermined direction, and the inner support member that is linked to the inner support member when the saddle member is suspended. And an outer support member that is provided with a gripping portion and that is integrated with the flange member when marking the measuring point. And
The inner support member is provided on a pair of inner cylinder support shaft members fixed to the upper part of the flange member, and is provided on the pair of inner cylinder support shaft members so that the flange member can be relatively swung in a certain direction. An inner cylinder to be supported,
The outer support member includes a pair of outer cylinder support shaft members fixed to the inner cylinder body, and is provided on the pair of outer cylinder support shaft members and relatively intersects the flange member with respect to the swinging direction. And an outer cylinder body that is swingably supported in the direction of movement, and the upper cylinder body and the outer cylinder body are connected to the outer cylinder body by a downward displacement of the outer cylinder body. The connection part which integrates these is provided, It is characterized by the above-mentioned.

The surveying pole according to claim 2, wherein the pair of inner cylinder support shaft members extend in a horizontal direction, and the inner cylinder body is rotatable about the pair of inner cylinder support shaft members in a direction around an axis thereof. And
The pair of outer cylinder support shaft members extend in a direction that intersects the direction in which the pair of inner cylinder support shaft members extend and in the horizontal direction, and the outer cylinder body has an axis line to the pair of outer cylinder support shaft members. Can be rotated in the direction of rotation ,
The outer cylinder is provided with a guide hole for guiding the outer cylinder support shaft member in the extending direction of the flange member.

The surveying pole according to claim 3, wherein the gripping portion is provided on the outer cylindrical body, and the connecting portion has an engaging protrusion that protrudes toward a top portion of the flange member, The top has an engagement recess that engages with the engagement protrusion.
The surveying pole according to a fourth aspect is characterized in that the engaging projection is a detent projection.

The surveying pole according to claim 5 is characterized in that the marking mechanism has an electric drill for screwing a marker member into the measurement point.
The surveying pole according to claim 6 is characterized in that the marker member contains an IC chip for wirelessly transmitting its own position.

  The surveying pole according to claim 7, wherein the marking mechanism includes a mounting cylinder having a storage space for storing a paint spray can and attached to a lower portion of the saddle member, and a nozzle portion for discharging the paint. It is characterized by becoming.

The surveying pole according to claim 8, wherein the marking mechanism has an accommodation space for accommodating a stamp mechanism and is attached to a lower portion of the flange member, and positioning for positioning the measurement point And a pin.
The surveying pole according to claim 9 is characterized in that an upper end of the guide hole is expanded.

  According to the present invention, the surveying pole can be directed in the vertical direction by its own weight when carrying it, and the surveying pole is stably pressed against the measuring point when performing marking by specifying the measuring point. Marking can be performed. In addition, there is an effect that it is possible to avoid damage to the gimbal mechanism when marking a measuring point.

  In particular, a marking mechanism is constituted by a rotary drill member for screwing a marker member into a measuring point, and this connecting part is constituted by an engaging projection that protrudes toward the saddle member and receives the rotational reaction force of the rotary drill member. If an engagement recess that engages with the engagement protrusion is provided on the upper part of the member, the marker member can be stably driven into the measurement point when the marker member is placed at the measurement point.

FIG. 1 is an explanatory view of a surveying pole according to a first embodiment of the present invention, wherein (a) is an external view of the surveying pole, and (b) is a plan view of the marker member shown in (a). And (c) is a side view of the marker member shown in (b). FIG. 2 is a partial cross-sectional view of the surveying pole shown in FIG. FIG. 3 is an enlarged cross-sectional view of the gimbal mechanism portion shown in FIG. FIG. 4 is an enlarged external view showing the gimbal mechanism portion shown in FIG. 1, and is an explanatory view showing an engagement state between the engagement protrusion and the engagement recess shown in FIG. FIG. 5 is an enlarged cross-sectional view of the gimbal mechanism portion shown in FIG. 2, and is an explanatory view showing an engagement state between the engagement protrusion and the engagement recess. 6 is a longitudinal sectional view of the gimbal mechanism portion shown in FIG. It is sectional drawing which shows the connection state of the inner cylinder body shown in FIG. 2, and an outer cylinder body. FIG. 8 is an explanatory view showing an example of a usage state of the surveying pole of the present invention. FIG. 9 is an explanatory view showing a modified example of the gimbal mechanism used for the surveying pole of the present invention, and is a perspective view showing an external part of an outer cylindrical body constituting a part of the gimbal mechanism. FIG. 10 is an explanatory view showing a modified example of the gimbal mechanism used for the surveying pole of the present invention, and is an explanatory view showing a state where the collar member is suspended from the outer cylindrical body constituting a part of the gimbal mechanism. . FIG. 11 is a perspective view showing the internal structure of the outer cylinder shown in FIGS. FIG. 12 is a longitudinal sectional view showing the internal structure of the outer cylinder shown in FIGS. 13 is a cross-sectional view showing a relative positional relationship among the outer cylinder, the inner cylinder, and the columnar fitting member shown in FIG. FIG. 14 is a plan view of the outer cylinder shown in FIG. 11 viewed from below. FIG. 15 is a partial cross-sectional view showing the relative positional relationship between the inner cylindrical body, the columnar fitting member shown in FIG. 12, and the disk-like lid shown in FIG. FIG. 16 is a cross-sectional view illustrating a coupling relationship among the columnar fitting member, the inner cylindrical body, and the outer cylindrical body. FIG. 17 is a perspective view showing an assembled state of the inner cylinder body to the columnar fitting member. FIG. 18 is a perspective view illustrating a state in which the inner cylinder is assembled to the columnar fitting member when viewed from another angle. FIG. 19 is an explanatory view of a surveying pole according to the second embodiment of the present invention, in which (a) is a cross-sectional view showing a state where a paint spray can is provided on the surveying pole shown in FIG. ) Is an explanatory view showing marks formed by spraying the paint. FIG. 20 is an explanatory view of a surveying pole according to the third embodiment of the present invention, in which (a) is a cross-sectional view showing a state in which a stamp member is provided on the surveying pole shown in FIG. It is explanatory drawing which shows the mark formed of the stamp member.

(Example 1)
Hereinafter, embodiments of a surveying pole according to the present invention will be described with reference to the drawings.
FIG. 1 is an external view of a surveying pole 1 according to an embodiment of the present invention, and FIG. 2 is a partial sectional view of the surveying pole 1 shown in FIG.

This surveying pole 1 has a flange member 2, a gimbal mechanism 3, and a marking mechanism 4.
A reflecting prism 5 is provided in the middle of the collar member 2. The reflecting prism 5 is fastened and fixed to the flange member 2 by a fastening member 6 'as shown in FIG.

  An all-round prism is used as the reflecting prism 5. For the detailed configuration of this all-round prism, refer to Japanese Unexamined Patent Application Publication No. 2009-204557. If this all-round prism is used, the surveying pole 1 can be carried without paying attention to the direction of the reflecting prism 5.

The marking mechanism 4 is provided at the lower part of the flange member 2, and the gimbal mechanism 3 is provided at the upper part of the flange member 2.
The marking mechanism 4 has a mounting cylinder 6. The mounting cylinder 6 is fixed to the lower end portion of the flange member 2.
A commercially available electric drill 7 is fixed to the mounting cylinder 6 with fastening screws 8.

  A spindle shaft 9 is provided at the lower end of the electric drill 7. A chuck member 10 is provided at the tip of the spindle shaft 9. The chuck member 10 is provided with a detachable marker member 11 for marking the measuring point P.

  FIG. 1B shows a plan view of the marker member 11, and FIG. 1C shows a side view of the marker member 11. The marker member 11 incorporates an IC chip that wirelessly transmits its position. The surveying worker has a receiving device (not shown). The surveying worker can specify the position of the marker member 11 using this receiving device.

  The gimbal mechanism 3 has a function of hanging the flange member 2 by its own weight. The gimbal mechanism 3 has an inner bearing member 12 and an outer bearing member 13 as shown in FIG. The inner support member 12 is linked to the flange member 2 by its own weight and has a function of supporting the flange member 2 so as to be swingable in a certain direction.

  The outer support member 13 is relatively linked to the inner support member 12 by its own weight, and swings the inner support member 12 in a direction crossing the swinging direction of the flange member 2 when the flange member 2 is suspended. It has the function of being able to be supported and to be integrated with the eaves member 2 while releasing the linkage of the eaves member 2 with the inner support member 12 when marking on the measuring point P.

  The inner support member 12 has a pair of inner cylinder support shaft members 14 and an inner cylinder body 15 as shown in an enlarged manner in FIGS. The pair of inner cylinder support shaft members 14 are fixed to the upper part of the flange member 2 and extend in the horizontal direction and in opposite directions.

  The inner cylinder support shaft member 14 includes a shaft portion 14a and a head portion 14b. A pair of through holes 15a are formed in the peripheral wall of the inner cylinder 15 so as to penetrate the peripheral wall in the thickness direction. The shaft portion 14a is inserted through the through hole 15a.

  A screw portion is formed at the tip of the shaft portion 14a. The inner cylinder support shaft member 14 is fixed to the upper portion of the flange member 2 by screwing the screw portion to the flange member 2. Thus, the inner cylinder 15 is provided on the pair of inner cylinder support shaft members 14 so as to be rotatable about the axis thereof, and has a function of relatively supporting the flange member 2 so as to be swingable in a certain direction. The head portion 14 b functions as a stopper for the inner cylinder 15.

  The outer support member 13 includes a pair of outer cylinder support shaft members 16 and an outer cylinder body 17. The pair of outer cylinder support shaft members 16 are fixed to the inner cylinder body 15 and extend in a direction intersecting the extending direction of the pair of inner cylinder support shaft members 14 and in the horizontal direction. Here, the pair of outer cylinder support shaft members 16 extend in a direction orthogonal to the direction in which the pair of inner cylinder support shaft members 14 extend.

  The outer cylinder support shaft member 16 includes a shaft portion 16a and a head portion 16b. A pair of guide holes 17 a are formed in the peripheral wall of the outer cylindrical body 17 so as to penetrate the peripheral wall in the thickness direction and extend in the extending direction of the flange member 2. The shaft portion 16a is inserted through the guide hole 17a.

  A screw portion is formed at the tip of the shaft portion 16a as shown in FIGS. The inner cylinder 15 is formed with a screw hole 15b into which the screw portion of the shaft portion 16a is screwed. The outer cylinder support shaft member 16 is fixed to the inner cylinder 15 by screwing the threaded portion into the screw hole 15b.

  As a result, the outer cylinder body 17 is provided on the pair of outer cylinder support shaft members 16 so as to be rotatable in the direction around the axis thereof, and relatively swings the flange member 2 in a direction intersecting with a predetermined swinging direction. Support in a movable manner. The head portion 16 b functions as a retaining member for the outer cylindrical body 17.

  As shown in FIGS. 1 to 6, a cylindrical gripping portion 18 is formed on the top of the outer cylinder body 17. A push button 19 and a battery (not shown) are provided on the top of the cylindrical gripping portion 18. The push button 19 and a drive motor (not shown) of the electric drill 7 are connected by a cord 20.

  As shown in FIG. 2, an engagement protrusion 21 that protrudes toward the top of the flange member 2 is formed inside the outer cylindrical body 17. An engagement recess 22 that engages with the engagement protrusion 21 is formed on the top of the flange member 2 as shown in an enlarged view in FIGS. 2, 3, 4, 6, and 7.

  The engagement protrusion 21 cooperates with the engagement recess 22 to connect the upper portion of the flange member 2 and the outer cylinder body 17 by the downward displacement of the outer cylinder body 17, thereby connecting the flange member 2 and the outer cylinder body 17. It functions as a connecting part to be integrated. The engagement protrusion 21 also has a function as a rotation prevention protrusion of the flange member 2.

  The surveying pole 1 is carried by gripping a cylindrical gripping portion 18. When the surveying pole 1 is carried by grasping the cylindrical gripping portion 18, the inner cylinder 15 and the outer cylinder 17 are linked by the weight of the flange member 2 as shown in FIGS. Then, as shown in FIG. 8, the eaves member 2 is suspended in the vertical direction.

  When marking the measurement point P using the surveying pole 1, the tip of the surveying pole 1 is pressed against the measurement point P while holding the cylindrical gripping part 18. Then, the inner cylinder support shaft member 14 moves along the guide hole 17a. As a result, as shown in FIGS. 4 and 6, the engagement protrusion 21 and the engagement recess 22 are fitted, and the outer cylindrical body 17 and the flange member 2 are integrated.

  Thereby, the link | linkage by the dead weight of the collar member 2 of the inner cylinder body 15 and the outer cylinder body 17 is cancelled | released. Therefore, when integrating the outer cylinder 17 and the eaves member 2, the inner cylinder 15 becomes a free state, and the inner cylinder 15 is prevented from being damaged.

Next, when the push button 19 is pushed with a finger while holding the cylindrical gripping part 18 with a hand, the electric drill 7 is driven and the marker member 11 is driven to the measuring point P.
At that time, a rotational reaction force is applied to the surveying pole 1, but since the engaging projection 21 and the engaging recess 22 function to prevent the surveying pole 1 from rotating, the marker member 11 can measure the point without any trouble. P is placed.
In addition, as the electric drill 7, a commercially available cord-lesle type can also be used.

(Modification)
9 to 18 show modified examples of the gimbal mechanism 3. In this modification, as shown in FIGS. 9 to 12, the lower portion of the guide hole 17 a of the outer cylinder body 17 has a width that is the same as the diameter of the shaft portion 16 a of the outer cylinder support shaft member 16. The upper end of the guide hole 17a is increased in diameter upward to form an enlarged diameter portion 17b.

  Here, as shown in FIGS. 12 to 14, the engaging protrusion 21 includes a cylindrical surrounding protrusion 21 a and a fitting protrusion 21 b. The surrounding protrusion 21a has a circular fitting hole 21c at the center thereof, and the inner peripheral wall of the surrounding protrusion 21a is a tapered wall 21d in which the diameter of the fitting hole 21c gradually decreases from the bottom to the top. It is said that.

The fitting protrusion 21b is disposed in the fitting hole 21c, extends in the diameter direction, and crosses the fitting hole 21c.
As shown in FIGS. 12, 13, and 15, a columnar fitting member 23 is fixed to the upper portion of the flange member 2 by fastening members such as bolts and nuts. Thereby, the columnar fitting member 23 is integrated with the flange member 2 to form the top of the flange member 2.

  The diameter of the trunk portion 23a of the cylindrical fitting member 23 is slightly smaller than the diameter of the fitting hole 21c. The top 23b of the cylindrical fitting member 23 has a tapered shape corresponding to the tapered wall 21d of the surrounding projection 21a. In this modification, as shown in FIG. 16, the engagement recess 22 has a shape that crosses the top 23b in the diametrical direction and fits into the fitting protrusion 21b.

  Screw holes 23c extending in opposite directions in the horizontal direction are formed in the body portion 23a of the cylindrical fitting member 23 as shown in FIGS. A pair of through holes 15a of the inner cylinder 15 are opposed to the pair of screw holes 23c as shown in FIG.

  As shown in FIG. 16, the pair of inner cylinder support shaft members 14 is formed with a screw portion 14c at the tip of the shaft portion 14a. The pair of inner cylinder support shaft members 14 are fixed to the body portion 23a of the cylindrical fitting member 23 by screwing the screw portion 14c and the screw hole 23c.

  As described above, a pair of screw holes 15b are formed in the inner cylinder 15 in a direction orthogonal to the pair of through holes 15a. A screw portion 16c formed at the tip of the shaft portion 16a of the outer cylinder support shaft member 16 is screwed into the screw hole 15b as shown in FIG. The pair of outer cylinder support shaft members 16 are fixed to the inner cylinder body 15 by screwing the screw portions 16c and the screw holes 15b.

  As shown in FIG. 16, the outer cylinder body 17 is supported by the inner cylinder body 15 through a pair of outer cylinder support shaft members 16 so as to be rotatable around the axis. As shown in FIGS. 11 to 14, an annular stepped portion 17 c is formed at the lower portion of the outer cylindrical body 17.

  A disc-shaped lid 24 shown in FIGS. 15, 17, and 18 is bonded and fixed to the annular stepped portion 17c. An opening 25 is formed in the center of the disc-like lid 24, and the opening wall 25a is tapered as shown in FIG. The tilting area of the flange member 2 is limited by the size of the opening 25. Therefore, even if the flange member 2 is tilted by so-called gimbal free, the engagement protrusion 21 and the engagement recess 22 are prevented from being tilted so much that they cannot be locked.

  According to this modified example, when the surveying pole 1 is pressed against the measuring point in order to grip the cylindrical gripping part 18 for marking, the saddle member 2 and the cylindrical gripping part 18 are as shown in FIG. Since the top 23b of the cylindrical fitting member 23 is tapered and the surrounding projection 21a is tapered and the upper portion of the guide hole 17a is enlarged in diameter, There is a margin for the fitting member 23 to change its posture.

  Therefore, the cylindrical fitting member 23 is guided in the direction toward the fitting hole 21c by the component force generated by the pressing force of the surveying pole 1 to the measuring point P, so that the fitting protrusion 21b can be smoothly engaged with the fitting recess. 22 is fitted.

(Example 2)
In the second embodiment, as shown in FIG. 19A, the mounting cylinder 6 as a part of the marking mechanism 4 has an accommodation space 26a for accommodating a commercially available paint spray can 26. A fastening ring member 27 is provided at the tip of the mounting cylinder 6. A skirt member 28 as a nozzle portion is provided between the paint spray can 26 and the fastening ring member 27.

  The skirt member 28 has a paint passage 28 a, and the upper end of the skirt member 28 is fitted to a discharge nozzle 26 b of a commercially available paint spray can 26. The surveying pole 1 is pressed toward the measuring point P. Then, the discharge nozzle 26b is pushed into the paint spray can 26, and a valve body (not shown) is opened. As a result, the paint inside the paint spray can 26 is discharged through the skirt member 28, and a mark P 'is formed at the measuring point P as shown in FIG.

(Example 3)
In the third embodiment, the mounting cylinder 6 is configured to accommodate a stamp mechanism as a part of the marking mechanism. As shown in FIG. 20A, the mounting cylinder 6 has an accommodation space 29a for accommodating a stamp pillar 29 that constitutes a part of the stamp mechanism.

  The stamp column 29 is fixed to the mounting cylinder 6 by the tightening screw 8 as in the first embodiment. A storage space 31 for storing the stamp ink impregnation member 30 is formed below the stamp column 29.

  A positioning pin 32 and a biasing spring 33 are disposed in the accommodation space 31. The positioning pin 32 is used to position the surveying pole 1 at the measurement point P. The head portion 32a of the positioning pin 32 has a flat shape, and a positioning projection 34 is formed on the head portion 32a.

  A positioning projection 35 is formed on the stamp column 29 so as to face the positioning projection 34. One end of the biasing spring 33 is fitted to the positioning projection 34, and the other end is fitted to the positioning projection 35.

The stamp ink impregnating member 30 and the positioning pin 32 are urged downward by the urging spring 33 to press the surveying pole 1 toward the measuring point P. Then, the urging force is accumulated in the urging spring 33.
As a result, the ink impregnated in the stamp ink-impregnated member 30 is pushed out, and a mark P ′ is formed at the measuring point P as shown in FIG.

  As mentioned above, although the Example was described, the Example of this invention is not restricted to this. For example, the outer bearing member 13 is relatively linked to the inner bearing member 12 by its own weight, and the inner bearing member 12 is moved in a direction intersecting the swinging direction of the collar member 2 when the collar member 2 is suspended. The structure is not limited to this as long as the structure is supported so as to be swingable and integrated with the eaves member 2 when marking the measuring point P.

DESCRIPTION OF SYMBOLS 1 ... Surveying pole 2 ... Gutter member 3 ... Gimbal mechanism 5 ... Reflective prism 4 ... Marking mechanism 12 ... Inner support member 13 ... Outer support member 18 ... Gripping part (columnar grip part)
P ... Station

Claims (9)

A reflecting prism provided between an upper part and a lower part of the saddle member, a marking mechanism provided at the lower part of the saddle member and for marking a measuring point, and an upper part of the saddle member provided on the saddle With a gimbal mechanism that hangs the member by its own weight,
The gimbal mechanism includes an inner support member that is linked to the saddle member and supports the saddle member so as to be swingable in a predetermined direction, and the inner support member that is linked to the inner support member when the saddle member is suspended. And an outer support member that is provided with a gripping portion and that is integrated with the flange member when marking the measuring point. And
The inner support member is provided on a pair of inner cylinder support shaft members fixed to the upper part of the flange member, and is provided on the pair of inner cylinder support shaft members so that the flange member can be relatively swung in a certain direction. An inner cylinder to be supported,
The outer support member includes a pair of outer cylinder support shaft members fixed to the inner cylinder body, and is provided on the pair of outer cylinder support shaft members and relatively intersects the flange member with respect to the swinging direction. And an outer cylinder body that is swingably supported in the direction of movement, and the upper cylinder body and the outer cylinder body are connected to the outer cylinder body by a downward displacement of the outer cylinder body. A surveying pole characterized in that it is provided with a connecting part that integrates the slab . The pair of inner cylinder support shaft members extend in a horizontal direction, and the inner cylinder body is rotatable to the pair of inner cylinder support shaft members in a direction around its axis ,
The pair of outer cylinder support shaft members extend in a direction that intersects the direction in which the pair of inner cylinder support shaft members extend and in the horizontal direction, and the outer cylinder body has an axis line to the pair of outer cylinder support shaft members. Can be rotated in the direction of rotation ,
The surveying pole according to claim 1, wherein the outer cylinder is provided with a guide hole for guiding the outer cylinder support shaft member in a direction in which the flange member extends.   The gripping portion is provided on the outer cylinder, and the connecting portion has an engaging protrusion that protrudes toward the top of the flange member, and the top of the flange member engages with the engaging protrusion. The surveying pole according to claim 2, further comprising an engagement recess.   The surveying pole according to claim 3, wherein the engaging protrusion is a detent protrusion.   The surveying pole according to claim 4, wherein the marking mechanism includes an electric drill for screwing a marker member into the measurement point.   The surveying pole according to claim 5, wherein the marker member includes an IC chip that wirelessly transmits its position.   3. The marking mechanism according to claim 2, wherein the marking mechanism includes a mounting cylinder having a storage space for storing a paint spray can and attached to a lower portion of the flange member, and a nozzle portion for discharging the paint. Item 5. The surveying pole according to any one of items 4.   The marking mechanism includes a mounting cylinder having a receiving space for storing a stamp mechanism and attached to a lower portion of the flange member, and a positioning pin for positioning the measuring point. Item 5. The surveying pole according to any one of items 2 to 4.   The surveying pole according to any one of claims 3 to 8, wherein an upper end of the guide hole is widened.