Hemispherical concave type tilt angle meter

Abstract

To provide an inclination angle meter which can accurately measure an inclination angle of a composite inclination plane, at once, and can prevent a slide state in which measured values vary continuously according to vibration even under strong vibration, and whose structure is simplified.SOLUTION: An inclination angle meter is a substantially cube having a hemispherical recess 2, on the bottom face of the recess, a positional memory 3 for displaying a center point 10, multiple meridians, and multiple circles is provided. In the recess, viscous liquid 4 is filled and a metal small ball 5 is put into the recess and the upper end face of the recess is covered with a transparent cover 6. When a ground plane to be measured is horizontal, the metal small ball 5 is provided on the center point 10 being the deepest point on the recess, and is not horizontal, the inclination angle meter is inclined and the deepest point is deviated from the center point, therefore the metal small ball 5 in the viscous liquid 4 gently moves to the new deepest point, and the position of the moved metal small point 5 is grasped by a position memory 3, thereby measuring an inclination angle of a composite inclination plane.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an inclinometer used to measure the inclination angle of an object. [Background technology]

[0002] In recent years, at construction sites and other locations, inclinometers that measure the level of ground or objects are often used. These include "pendulum-type" inclinometers, which attach a magnet to a pendulum and use a magnetic sensor to measure the inclination when the pendulum swings toward the center of the earth due to gravity, and "float-type" inclinometers, which measure the inclination from the change in the amount of static electricity in a float inside a container filled with liquid and gas. However, inclinometers that use these principles are vulnerable to changes in acceleration, and when used in vehicles and other places that are subject to frequent vibrations, it is known that corrections must be made using a gyro sensor (angular velocity sensor), which detects how many degrees the angle changes per second relative to a reference axis.

[0003] In addition, the inclinometer (quoted from the claims of utility model registration) in Patent Document 1, which is characterized in that "on the surface of a hemispherical transparent cell, multiple meridians are displayed as lines where an elevation perpendicular to the bottom and passing through the apex intersects with the cell surface, and multiple parallels are displayed as lines where a plane parallel to the bottom intersects with the cell surface, and the inside of the cell is filled with liquid leaving indicator bubbles" is a technology that is widely used as an inclinometer like the "pendulum type" and "float type" mentioned above, and is used, for example, when a small bubble tube as shown in Figure 7 is attached to a stepladder to check whether it is set up horizontally, or when a similar bubble tube is attached to a DIY shelf to check whether it is tilted. In addition, as described in "Materials" in Non-Patent Document 1, the material of these inclinometers is generally an acrylic resin body, filled with a petroleum-based liquid, and sealed with air bubbles remaining. This inclinometer, which measures horizontality and angles using air bubbles, has the advantage that it can quickly recognize changes in inclination even with a slight movement, and has a simple structure. However, for example, it is known that beginners who use chainsaws practice to place the notch at a 45-degree angle and the bottom cutting line of the notch horizontally so that they can cut down trees safely. When doing so, as shown in Figure 8, they attach an incline angle meter to the guide bar or body of the chainsaw with a magnet or the like. However, this means that the vibrations of the engine are directly transmitted to the incline angle meter, causing the air bubbles to collapse and the measured value to constantly fluctuate in accordance with the vibrations, posing the issue that "depending on the application, it may be difficult to measure accurate horizontality or inclination angles."

[0004] Furthermore, in recent years, there are a wide variety of inclinometers, and improvements are being made, such as an inclinometer with a stainless steel ball instead of an air bubble, as described in Non-Patent Document 2, designed for purposes such as keeping a yacht level while sailing or leveling a camper to make it comfortable, as shown in the left of FIG. 9 (see Non-Patent Document 3), and for purposes such as attaching to a bicycle handlebar to measure the incline of a traveling location, as shown in the right of FIG. 9 (see Non-Patent Document 4), and a marine inclinometer, as shown in FIG. 10 (see Non-Patent Document 5), which employs an oil damper to suppress small swaying. On the other hand, when used in a place where small vibrations are constantly occurring, such as an engine, the inclinometer with the stainless steel ball prevents the collapse of the air bubble, but there remains a problem that the stainless steel ball keeps moving, and the inclinometer with the oil damper includes a "structure in which oil moves through a valve when a piston with a small valve moves due to vibration," which creates a new problem of a complicated structure, and there is room for further improvement. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Jitsuzen Showa 62-083913 Inclinometer [Non-Patent Document 1] Round vial φ11 Blue 2 pieces / Shinwa Sokutei Co., Ltd. Home page Product information https: / / www.shinwasokutei.co.jp / products / 76530 / [Non-Patent Document 2] All Inclinometers / Sun Company, Inc. Homepage https: / / levogage.com / collections / inclinometers [Non-Patent Document 3] Lev-o-gage / All Inclinometers / Sun Company, Inc. Home page https: / / levogage.com / products / product_7f777420-07f0-b955-fc36-fc89521ac9d6 [Non-Patent Document 4] CyclClimb Bike Inclinometer / All Inclinometers / Sun Company, Inc. Homepage https: / / levogage.com / products / product_21756502-f397-a8de-50e1-f45abc9e5291 [Non-Patent Document 5] Marine Clinometer / Daiko Instruments Co., Ltd. Website http: / / daiko.asia / dcl.html Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, the objective of the present invention is to provide an inclinometer that can accurately measure the inclination angle of a compound inclined surface in one go, prevents a sliding state in which the measured value continues to move in accordance with the vibration even under severe vibration, and has a simplified structure. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the inclinometer of the present invention is a substantially cubic or cylindrical body having a hemispherical recess, and displays on a bottom surface of the recess a center point which is a point where a line drawn perpendicular from the center of a circle on an upper end surface of the hemispherical recess intersects with a bottom surface, a plurality of meridians represented by points where a line drawn perpendicular from a diameter of a circle on an upper end surface of the hemispherical recess intersects with the bottom surface, and a plurality of latitudes represented by lines where a plane parallel to the upper end surface of the hemispherical recess intersects with the bottom surface, and the hemispherical recess is filled with a viscous liquid, and metal globules Put in Fill the container with a viscous liquid having a high viscosity that suppresses the sliding state of the small metal balls moving in accordance with the vibrations under continuous and intense vibrations, The upper end surface of the hemispherical recess is covered with a transparent cover. and attach it to the chainsaw.The inclination angle meter of the present invention is characterized in that, when the main body of the inclination angle meter is attached to a ground surface of an inclined angle measurement target that is not horizontal, the main body of the inclination angle meter is connected to the inclination angle adjustment mechanism in order to keep the main body of the inclination angle meter horizontal. The inclination angle adjustment mechanism, which ensures the stability of the inclination angle meter when installed and has a simplified structure, is characterized in that it is a plate-like member having an opening on the flat surface side of the recess of the approximately cube having a hemispherical recess, the bottom surface being the ground surface with the inclined angle measurement target, having a substantially vertical through hole in the center of one side surface, and having substantially vertical through holes on the left and right sides of the one side surface, which is connected to the approximately cube or approximately cylindrical body having the hemispherical recess through the through hole with a screw-shaped member, and is capable of adjusting the front-to-back horizontal direction and the left-to-right horizontal direction of the approximately cube or approximately cylindrical body having the hemispherical recess. Effect of the Invention

[0008] The present invention is a substantially cube having a hemispherical recess, and a center point is indicated on the bottom surface of the recess, the center point being a point where a line drawn perpendicular from the center of a circle on the upper end surface of the hemispherical recess intersects with a bottom surface, a plurality of meridians are indicated by points where a line drawn perpendicular from a diameter of a circle on the upper end surface of the hemispherical recess intersects with the bottom surface, and a plurality of latitudes are indicated by lines where a plane parallel to the upper end surface of the hemispherical recess intersects with the bottom surface, and the hemispherical recess is filled with a viscous liquid, and the recess filled with the viscous liquid is displayed on the bottom surface of the recess. metal globules Put in Fill the container with a viscous liquid having a high viscosity that suppresses the sliding state of the small metal balls moving in accordance with the vibrations under continuous and intense vibrations, The upper end surface of the hemispherical recess is covered with a transparent cover. and attach it to the chainsaw.The inclinometer according to the present invention is an inclinometer. When the inclinometer according to the present invention is installed on a horizontal surface, the deepest point becomes the center point and the hard sphere is located at the center point, but when the inclinometer is installed on an inclined surface, the inclinometer tilts, changing the deepest point, and the hard sphere in the viscous liquid moves gently to the new deepest point. The position of the hard sphere after the movement can be measured from the meridian and latitude lines to measure the inclination angle. In addition, in order to prevent the viscous liquid from sliding in response to vibrations caused by strong vibrations of an engine or the like, the structure itself can be simplified without requiring a gyro sensor, an oil valve, or the like. Furthermore, when the contact surface with the inclined angle measurement object is an inclined surface, if it is desired to keep the main body of the inclinometer horizontal, the angle can be easily adjusted by connecting it to an inclinometer adjustment mechanism. The approximately cube having a hemispherical recess has an opening on the plane side of the recess, the bottom surface forms the contact surface with the object to be measured for the tilted angle, and has a plate-shaped member having a substantially vertical through hole in the center of one side and two substantially vertical through holes on the left and right sides of the side, which is connected to the approximately cube or cylinder having the hemispherical recess through the through holes with a screw-shaped member.This tilt angle adjustment mechanism adjusts the front-to-back horizontal directions and the left-to-right horizontal directions of the approximately cube or cylinder having the hemispherical recess, and is one of the tilt angle adjustment mechanisms.The tilt angle adjustment mechanism can be configured to adjust a wide range of tilt angles with three angle adjustment screws, and a wide contact surface with the object to be measured for the tilted angle can be ensured, thereby achieving both simplification of the tilt angle adjustment mechanism and stability during use. [Brief description of the drawings]

[0009] [Figure 1] Perspective view of a hemispherical concave inclinometer [Diagram 2] Top view of a hemispherical concave inclinometer [Diagram 3] Front cross-sectional view of a hemispherical concave inclinometer [Figure 4] Right side view of hemispherical concave inclinometer [Diagram 5] Left side view of hemispherical concave inclinometer [Figure 6] Right side view of a hemispherical concave inclinometer with the inclination angle adjusted [Figure 7] Example of a round vial [Figure 8] Example of a round bubble attached to a chainsaw (front view) [Figure 9] Example of an inclinometer using a stainless steel ball [Figure 10] Example of an inclinometer using an oil damper DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Regarding the configuration of the inclinometer (Claim 1) An embodiment of the inclinometer of the present invention will be described below with reference to the accompanying drawings. As shown in the perspective view of FIG. 1, the hemispherical concave type inclination angle meter main body 1 is an approximately cube having a hemispherical concave portion 2, and the surface of the concave portion has a center point 10, which is the point where a line drawn perpendicular from the center of a circle on the upper end face of the hemispherical concave portion 2 intersects with the bottom face, a plurality of meridians represented by the points where a line drawn perpendicular from the diameter of the circle on the upper end face of the hemispherical concave portion 2 intersects with the bottom face, and a plurality of latitudes represented by the lines where a plane parallel to the upper end face of the hemispherical concave portion intersects with the bottom face. The hemispherical concave portion 2 is filled with a viscous liquid 4, a small metal ball 5 is placed in the viscous liquid 4, and the upper end face of the hemispherical concave portion 2 is covered with a transparent cover 6. With this configuration, when the contact surface of the inclinometer according to the present invention is horizontal, the small metal ball 5 is located at the center point 10, which is the deepest point of the hemispherical recess 2, and when the contact surface of the inclinometer according to the present invention is not horizontal, the inclinometer tilts, causing the deepest point of the hemispherical recess 2 to shift from the center point 10 toward the periphery. Therefore, since the small metal ball 5 is in the viscous liquid 4, it moves slowly from the center point 10 to the new deepest point of the hemispherical recess 2, and the position of the small metal ball 5 after its movement can be grasped by the position memory 3 consisting of meridians and latitudes, thereby making it possible to measure the inclination angle of the compound inclined surface.

[0011] About the shape of the main body In the plan view of Fig. 2, the shape of the main body 1 of the hemispherical concave inclination angle meter is shown as a shape in which a hemispherical recess 2 is provided in a substantially cubic member, but the shape is not limited to a substantially cubic shape and may be a substantially cylindrical shape, etc., as long as the size and shape allow for the provision of the hemispherical recess 2. In addition, since the front cross-sectional view of Fig. 3 is a drawing of an inclination angle meter that is attached to an object to be measured for an inclined angle via a mounting base 7 described later, the hemispherical recess 2 is shown as not fitting into the substantially cubic member and the bottom periphery protrudes, but the hemispherical recess 2 may be entirely contained within the substantially cubic member of the main body 1 of the hemispherical concave inclination angle meter, the bottom surface of the substantially cubic member may be covered with a plate-shaped member, and the hemispherical recess 2 may be attached to an object to be measured for an inclined angle without the mounting base 7. However, if the upper end surface of the hemispherical recess 2 and the ground surface of the main body 1 of the hemispherical concave inclination angle meter are not horizontal, the small metal ball 5 will not be located at the center point 10, so when the bottom surface of the main body 1 of the hemispherical concave inclination angle meter is used as the ground surface for an inclined angle measurement object such as a chainsaw, it is preferable to set the shape of the bottom surface of the approximately cubic member so that the upper end surface and the ground surface are parallel and horizontal. It is also possible to provide a recess in the inclined angle measurement object and fit the main body 1 of the hemispherical concave inclination angle meter into it. For example, when a convex portion is provided on the side surface of the approximately cube and the shape of the convex portion is fitted into a concave portion provided in the inclined angle measurement object, it is preferable to set the upper end surface and the inclined angle measurement object to be parallel and horizontal.

[0012] On the shape and position memory of hemispherical recesses. The position memory 3 has grooves at the locations of a plurality of meridians represented by the intersection of a line drawn perpendicular from the diameter of the circle on the upper end surface of the hemispherical recess 2 with the bottom surface, and a plurality of latitudes represented by the intersection of a plane parallel to the upper end surface of the hemispherical recess 2 with the bottom surface. The position memory 3 grasps the position of the point where the small metal ball 5 touches the surface of the hemispherical recess 2, and measures the inclination angle. The position memory 3 shown in FIG. 2 consists of latitudes indicating 30 degrees and 60 degrees in order from the center point 10 outward, and meridians perpendicular to the center point 10. By adjusting the length of the diameter of the small metal ball 5 exactly to the interval between the 30 degree and 60 degree latitudes, when the end of the small metal ball 5 is located at a position where it touches both the 30 degree and 60 degree lines, it is possible to measure an inclination angle of 45 degrees. However, the number of meridians and latitudes and the interval between the lines are not limited to this and can be set according to the size of the angle to be measured. The method of displaying the meridians and latitude lines may be not only by providing grooves as shown in the figure, but also by drawing lines with fluorescent paint, and customization is possible for work in dark places, for example. Furthermore, for example, if it is sufficient to grasp only the inclination angle from 0 degrees to 30 degrees, the shape of the hemispherical recess 2 may be cut horizontally at the latitude line of 30 degrees as shown in Figure 2, and customization may be possible depending on the object to be measured and the purpose.

[0013] Viscous liquids The viscous liquid 4 fills the hemispherical recess 2 and is intended to gently move the small metal ball 5 placed in the hemispherical recess 2. The purpose of use of commercially available inclinometers includes ensuring the safety of vehicles while they are moving, so it is important to shorten the time it takes to measure. For this reason, the viscosity required for the oil used is merely sufficient to achieve smooth movement, and as mentioned above, in places where small vibrations such as an engine are constantly occurring, there remains the problem that the bubbles and balls used for measurement are constantly moving. On the other hand, the present invention aims to solve the above problem by increasing the viscosity of the liquid filling the hemispherical recess 2 to a level higher than that of conventional liquids so that the small metal ball 5 placed in the hemispherical recess 2 does not move due to small vibrations such as those of an engine. In other words, it can be said that the purpose of using a viscous liquid itself is different from that of commercially available inclinometers. Therefore, the above-mentioned Under intense vibration When attaching the incline angle meter of the present invention to the guide bar of a chain saw using a magnet or the like, the viscous liquid 4 used is made of a highly viscous material. Need to In addition, because it does not require structures such as a gyro sensor or oil valve, the inclinometer can be easily miniaturized, expanding the range of uses. Furthermore, by making the inclinometer hemispherical concave, the present invention has the technical feature of being able to measure the inclination angle of a compound inclined surface at once. On the other hand, in places where small vibrations such as those described above are constantly occurring, the horizontal planes and inclined surfaces that can be measured are in all directions, which poses the problem that the influence of vibrations is greater than that of inclinometers that measure only a limited number of horizontal planes and inclined surfaces, such as the inclinometers described in Non-Patent Documents 2 and 3 (see Figure 9). However, by using the viscous liquid 4, this problem can be solved.

[0014] metal globules About the transparent cover The metal balls 5 are intended to be made of materials such as stainless steel, aluminum alloy, titanium alloy, nickel alloy, etc., which are hard metals that form a passive film on the surface that makes them resistant to rust and corrosion caused by liquids, but they can also be made of materials such as rubber and plastic, and are not limited to these. The transparent cover 6 is attached to the upper end surface of the hemispherical recess 2 so that the viscous liquid 4 and the small metal balls 5 filling the recess do not spill out. The material is assumed to be a transparent acrylic plate that allows the position markings 3 to be easily seen, but a glass plate, translucent material, or colored material may be used to enhance the design. Note that when the transparent cover 6 is attached, air may not be completely removed from the recess and may remain as air bubbles, but as long as the recess is almost filled with the viscous liquid 4, the presence or absence of air bubbles does not affect the effect of the present invention.

[0015] Regarding the tilt angle adjustment mechanism (Claim 2) If the contact surface between the main body 1 of the hemispherical concave inclination angle meter and the object to be measured for the angle of inclination is not horizontal, it is necessary to search for a horizontal location, or to measure the horizontal position and inclination angle from a position other than the center point 10. However, this problem can be solved by connecting an inclination angle adjustment mechanism to the main body 1 of the hemispherical concave inclination angle meter. The inclination angle adjustment mechanism is a member having a function of adjusting the horizontal position of the hemispherical concave inclination angle meter with respect to the contact surface. That is, the inclination angle adjustment mechanism is a mechanism (member) for holding the main body 1 of the hemispherical concave inclination angle meter placed on an inclined surface horizontally by inclining a member directly connected to the main body 1 of the hemispherical concave inclination angle meter in the inclination angle adjustment mechanism or the entire mechanism, or by raising or lowering a part of a member supporting the main body 1 of the hemispherical concave inclination angle meter from below or from the side. If the main body 1 of the hemispherical concave inclination angle meter can be connected to the inclination angle adjustment mechanism, for example, even if the installation location of the inclination angle meter of the chainsaw described above is not on a horizontal plane, it is possible to make a horizontal cut while checking that the measurement value of the inclination angle meter is at the center point 10, thereby improving work efficiency and increasing versatility by not being limited to a specific installation location. A representative inclination angle adjustment mechanism is a member having a biaxial torque hinge or ball joint fixing structure, but for example, a hydraulic or electric angle adjustment function may be embedded in a machine such as a chainsaw and connected to the main body 1 of the hemispherical concave inclination angle meter, and there are no limitations on the shape, structure, or power used.

[0016] Specific examples of tilt angle adjustment mechanisms (Claim 3) As a further specific example of the tilt angle adjustment mechanism, a method using the mounting base 7 will be described. As shown in Figures 1, 2, and 3, the mounting base 7 is a U-shaped plate-like member having an opening on the top side of the main body 1 of the hemispherical concave tilt angle meter, a substantially vertical through hole 11a in the center of the left side, and substantially vertical through holes 11b and 11c on the left and right sides of the right side, and is connected to the main body 1 of the hemispherical concave tilt angle meter through the through holes 11a, 11b, and 11c by an angle adjustment screw (front-rear direction) 8 and an angle adjustment screw (left-right direction) 9, which are screw-like members, and the bottom surface of the mounting base 7 serves as a contact surface with the object to be measured for tilt angle, enabling adjustment of the main body 1 of the hemispherical concave tilt angle meter in the front-rear horizontal direction and the left-right horizontal direction. This structure allows a wide range of tilt angles to be adjusted using only three angle adjustment screws, and also ensures a wide contact surface with the object being tilted for angle measurement, thus offering the advantage of simplifying the tilt angle adjustment mechanism while ensuring stability during use.

[0017] Specific angle adjustment methods As shown in Fig. 5, the mounting base 7 has a through hole 11a in the center of its left side surface, which is substantially vertical, and connects the main body 1 of the hemispherical concave inclination angle gauge to the mounting base 7 via an angle adjustment screw (front-rear direction) 8, which is a screw-shaped member. If the angle adjustment screw (front-rear direction) 8 is attached to the upper part of the through hole 11a, the main body 1 of the hemispherical concave inclination angle gauge will be inclined with its right side facing down, and if the angle adjustment screw (front-rear direction) 8 is attached to the lower part of the through hole 11a, the main body 1 of the hemispherical concave inclination angle gauge will be inclined with its left side facing down. Then, as shown in Figs. 4 to 6, the mounting base 7 has through holes 11b and 11c in the substantially vertical direction on the left and right sides of its right side surface, which connect the main body 1 of the hemispherical concave inclination angle gauge to the mounting base 7 via an angle adjustment screw (left-right direction) 9, which is a screw-shaped member. When the angle adjustment screw (left-right direction) 9 is located at the center of the through hole 11b and at the top of the through hole 11c, the through hole 11b side is tilted downward. When the angle adjustment screw (left-right direction) 9 is located at the bottom of the through hole 11b and at the top of the through hole 11c, the through hole 11b side can be tilted further downward. The tilt angle that can be adjusted at the connection position of the angle adjustment screw (front-back direction) 8 on the left side of the mounting base 7 is limited because the plate-like member of the mounting base 7 is close to the top surface of the main body 1 of the hemispherical concave tilt angle meter, but the tilt angle that can be adjusted at the connection position of the angle adjustment screw (left-right direction) 9 on the right side is not limited by the mounting base 7 because the mounting base 7 is U-shaped. Therefore, it is desirable to adjust the direction of the angle adjustment range by the angle adjustment screw (left-right direction) 9 on the right side to the direction of the large tilt.

[0018] Mounting base shape and fixing method The mounting base 7 is preferably U-shaped as shown in the figure, since the tilt angle in one direction can be adjusted greatly and versatility is increased, but it is also possible to provide approximately vertical through holes on three side surfaces and connect them via angle adjustment screws, or to make similar connections on the four side surfaces. In order to fix the bottom surface of the mounting base 7 to the tilt angle measurement target, as shown in Figure 7, there is a method of attaching a magnet 12 to the inside of the bottom surface of the mounting base 7 and attaching it by magnetic force, but the fixing method is not limited to this, and can also be done using an adhesive or the like. [Explanation of symbols]

[0019] 01 Body of the hemispherical concave inclinometer 02 Hemispherical recess 03 Position Memory 04 Viscous liquid 05 Metal small balls 06 Transparent cover 07 Mounting base 08 Angle adjustment screw (front-back direction) 09 Angle adjustment screw (left and right) 10 Center point (central recess) 11 Through hole 11a Through hole a 11b Through hole b 11c Through hole c 12. Magnet

Claims

[Claim 1] an inclination angle gauge which is an approximately cubic or cylindrical body having a hemispherical recess, and on the bottom surface of the recess is displayed a center point which is the point where a line drawn perpendicular from the center of a circle on the upper surface of the hemispherical recess intersects with a bottom surface, a plurality of meridians which are represented by points where a line drawn perpendicular from a diameter of a circle on the upper surface of the hemispherical recess intersects with the bottom surface, and a plurality of latitudes which are represented by lines where a plane parallel to the upper surface of the hemispherical recess intersects with the bottom surface; a small metal ball is placed in the hemispherical recess and filled with a viscous liquid having a high viscosity which suppresses the sliding state of the small metal ball in response to continuous violent vibrations; the upper surface of the hemispherical recess is sealed by a transparent cover; and the inclination angle gauge is attached to a chainsaw, The inclinometer is connected to a contact surface of an object to be measured that is not horizontal by a tilt angle adjustment mechanism for keeping the body of the inclinometer horizontal; The inclination angle adjustment mechanism is a plate-like member having an opening on the top side of an approximately cube or cylinder having a hemispherical recess, the bottom side being the contact surface with the object to be measured for the angle of inclination, a substantially vertical through hole in the center of one side and two substantially vertical through holes on the left and right of the other side, and is connected to the approximately cube or cylinder having a hemispherical recess through the through holes with a screw-shaped member, allowing adjustment in the front-to-back and left-to-right horizontal directions of the approximately cube or cylinder having a hemispherical recess.

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