JP4149981B2 - Percussion instrument - Google Patents

Description

  The present invention relates to a structure of a percussion instrument used for detecting damage (particularly lifting) of a building and the surface (particularly, the finished surface) of the building.

  Tiles, mortars, and the like, which are finishing layers constructed on the surface of a structure, may be damaged by “aging” due to aging. If this is left unattended, the finish layer may peel off from the surface of the structure, which is dangerous. For this purpose, the finishing layer is regularly inspected for peeling. For this inspection, a tool called a percussion tool is used, and an operator collides the percussion tool with a finishing layer and determines whether or not the finishing layer is damaged by the collision sound or the like (for example, Patent Documents). 1).

  FIG. 5 is an external view of a conventional percussion instrument. As shown in the figure, the percussion instrument 1 has five cylindrical members 2 to 6, which are assembled to be extendable. Specifically, each cylindrical member 2 to 6 is formed in a thin cylindrical shape, and the outer diameter dimension of the cylindrical member 2 is set smaller than the inner diameter dimension of the cylindrical member 3. Thereby, the cylindrical member 2 is inserted in the cylindrical member 3 so that extraction is possible. The relationship between the tubular member 3 and the tubular member 4, the relationship between the tubular member 4 and the tubular member 5, and the relationship between the tubular member 5 and the tubular member 6 are the same as those of the tubular member 2 and the tubular member 3. It is the same as the relationship. Therefore, the length of the percussion instrument 1 is extended or shortened by each cylindrical member 2-5 being pulled out from the adjacent cylindrical members 3-6. Furthermore, the cylindrical member 6 includes a sheet member 7 made of resin or the like around it. The sheet member 7 constitutes a grip that is gripped by an operator.

  A spherical percussion piece 8 is provided at the tip of the cylindrical member 2. The operator strikes or slides the percussion piece 8 against the surface of the structure. At this time, although a collision sound or a sliding sound is generated, the operator determines whether or not the structure is damaged based on a tone color such as the collision sound. However, when the percussion piece 8 is struck or slid on the structure, the surface may be damaged when the surface hardness of the structure is low. Therefore, the percussion piece 8 may be rotatably provided at the tip of the cylindrical member 2. In this case, the worker rolls the percussion piece 8 along the surface of the structure, and determines whether the structure is damaged based on the rolling sound generated at that time.

  As described above, when the spherical percussion probe 8 rotates, the structure as the subject is hardly damaged, but the sound (rolling sound) generated at that time is generated by the percussion probe 8 on the subject. Since it is smaller than the case where it is struck, there is a problem that it is difficult for the operator to determine whether or not there is damage. In order to solve this problem, there is a conventional percussion instrument in which a percussion piece is formed in a polyhedron (for example, see Patent Document 2). Since the cross-sectional shape of the percussion element becomes a polygon when the percussion element is formed into a polyhedron, a plurality of corners are regularly arranged on the outer peripheral surface of the percussion element. When the percussion piece rolls on the surface of the subject, the corners regularly and regularly collide with the subject, and a large collision sound is generated. This makes it easier for the operator to determine whether the subject is damaged based on the collision sound.

Japanese Utility Model Publication No. 4-122363 JP 2004-28581 A

  However, when a corner is formed on the outer peripheral surface of the percussion probe, when the percussion roller rolls on the surface of the subject, the impact when the corner and the subject collide increases. There is a risk of scratching the surface.

  Therefore, an object of the present invention is to provide a percussion instrument that can reliably detect damage to a subject without damaging the subject.

  In order to achieve the above object, a percussion instrument according to the present invention is a percussion instrument for detecting damage on a wall surface, and includes a spherical percussion element abutted on the wall surface and a virtual axis passing through the center of the percussion element. And a support mechanism that supports the percussion element in a freely rotatable manner, and a plurality of ridges extending in the meridian direction are juxtaposed along the latitude line direction on the peripheral surface of the percussion element. The outer peripheral surface is formed in an arc shape.

  In this percussion tool, a plurality of ridges are formed on the peripheral surface of the percussion element. Therefore, when the percussion element rolls on the surface of the subject (for example, a wall surface), the ridges are regularly and regularly formed on the subject. Colliding with the surface, intermittent impact sound is generated. This collision sound is loud enough for the operator to determine whether or not the subject is damaged. Moreover, since the outer peripheral surface of each ridge is formed in an arcuate surface, the impact when each ridge collides with the subject is small.

  The ridges are preferably provided in the range of 6 or more and 16 or less. Moreover, it is preferable that the equator radius of curvature of the outer peripheral surface of the ridge is set to 2 mm or more and 5 mm or less. Thereby, a sufficiently large impact sound is generated without damaging the subject.

  According to the present invention, when the percussion piece is brought into contact with the subject and rolled, the impact received by the subject is small, but the collision sound becomes sufficiently large. Therefore, an operator who inspects whether or not the subject is damaged can accurately inspect based on the collision sound without damaging the subject.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  1A and 1B are front views of a percussion instrument according to an embodiment of the present invention, in which FIG. 1A shows a state where the percussion tool is extended, and FIG. 1B shows a state where the percussion tool is shortened. FIG. 2 is an exploded perspective view of a main part of the percussion instrument.

  The percussion tool 20 is a tool for inspecting the damage of the wall surface of the building, and the operator peruses the wall surface using the percussion tool 20, and inspects the presence or absence of damage by the percussion sound. In this specification, this inspection is referred to as “wall damage inspection”. The percussion instrument 20 includes a main body 26, a percussion piece 27 provided at the tip of the main body 26, and a support mechanism 28 (see FIG. 2) that rotatably supports the percussion piece 27. A feature of the percussion instrument 20 according to the present embodiment is that the percussion instrument 20 includes a percussion element 27 having a structure to be described later, so that the worker can damage the wall surface of the building that is the subject. The wall 26 can be surely inspected without attaching a mark, and the main body 26 includes a plurality of cylindrical members 21 to 25, whereby the main body 26 is configured as shown in FIG. ) As shown in (b), it is configured to be stretchable. Hereinafter, the structure of the percussion instrument 20 will be described in detail.

  The main body 26 includes five cylindrical members 21 to 25 in the present embodiment. Each of the cylindrical members 21 to 25 is assembled in a telescopic manner, so that the main body 26 can expand and contract in the axial direction. Specifically, each of the cylindrical members 21 to 25 is formed in a cylindrical shape and is made of a metal such as stainless steel. The outer diameter dimension of the cylindrical member 21 is set to be smaller than the inner diameter dimension of the cylindrical member 22, so that the cylindrical member 21 can slide along the axial direction with respect to the cylindrical member 22. . Similarly, the cylindrical member 22 is slidable with respect to the cylindrical member 23, and the cylindrical member 23 and the cylindrical member 24 are slidable in the axial direction with respect to the cylindrical member 24 and the cylindrical member 25, respectively. It is. In addition, the number of the cylindrical members which comprise the main body 26 is not limited to five, A design is changed suitably.

  In the present embodiment, the tubular member 25 is provided with a sheet member 30 made of rubber or resin around the rear end thereof. Thereby, the cylindrical member 25 serves also as a grip which an operator holds. A connecting tool 31 to which a string member such as a rope is connected is provided on the rear end surface of the tubular member 25. For example, the operator can connect one end of the string member to the connector 31 and connect the other end to the body. Thereby, even if the percussion tool 20 slides down from the operator's hand, it does not leave the operator's body. As a result, even when the wall surface damage inspection is performed at a high place, the percussion instrument 20 is prevented from falling to the ground.

  The support mechanism 28 is provided at the distal end portion of the main body 26, specifically, at the distal end of the cylindrical member 21. The support mechanism 28 includes a support shaft 32 and a positioning shaft 33. The support mechanism 28 supports the percussion piece 27 so that the percussion piece 27 can rotate around the virtual axis N. This virtual axis N coincides with the axial direction of the main body 26.

  The support shaft 32 includes a large-diameter portion 34 and a small-diameter portion 35, which are continuous in the axial direction. Therefore, a step portion is formed at the boundary portion between the large diameter portion 34 and the small diameter portion 35. The distal end portion of the cylindrical member 21 is fitted and fixed to the rear end portion of the large diameter portion 34. A screw hole 36 is provided at the center of the distal end of the small diameter portion 35 toward the large diameter portion 34 along the direction of the virtual axis N. The positioning shaft 33 is screwed into the screw hole 36. In addition, as the positioning shaft 33, a bolt is employed in the present embodiment. The positioning shaft 33 has a screwed portion 37 and a head portion 38, and the percussion piece 27 is positioned on the support shaft 32 by screwing the screwed portion 37 into the screw shaft 36.

  FIG. 3 is a side view of the percussion piece 27, and FIG. 4 is a plan view. As shown in these drawings, the percussion piece 27 is formed in a spherical shape and can be made of resin, metal, or the like. The percussion element 27 has a through hole 39. The through hole 39 passes through the center of the percussion piece 27 and penetrates the percussion piece 27. The through hole 39 includes a large diameter hole 40 and a small diameter hole 41 continuous thereto. The inner diameter dimension of the small diameter hole 41 corresponds to the outer diameter dimension of the small diameter portion 35 (see FIG. 2) of the support shaft 32. Therefore, the small diameter portion 35 is fitted into the small diameter hole 41 without a gap. Thereby, the percussion piece 27 is rotatable around the virtual axis N while being supported by the small diameter portion 35.

  The inner diameter of the large-diameter hole 40 corresponds to the outer diameter of the head 38 of the positioning shaft 33, and the depth of the large-diameter hole 40 corresponds to the height of the head 38. is doing. Therefore, when the positioning shaft 33 is screwed into the small diameter portion 35 with the percussion piece 27 supported by the small diameter portion 35, the head 38 of the positioning shaft 33 is fitted into the large diameter hole 40. In the present embodiment, as shown in FIG. 2, the depth dimension L1 of the screw hole 36 of the small diameter portion 35 corresponds to the length dimension L2 of the screwing portion 37 of the positioning shaft 33. Therefore, in a state where the positioning shaft 33 is completely screwed into the small-diameter portion 35, the head 38 of the positioning shaft 33 does not press the bottom surface 42 of the large-diameter hole 40 of the palpator 27 and enters the large-diameter hole 40. It is inserted. That is, the positioning shaft 33 does not fasten the percussion piece 27 to the support shaft 32 but positions the percussion piece 27 so that it does not fall off the support shaft 32. Accordingly, as described above, the percussion piece 27 can freely rotate around the virtual axis N.

  As shown in FIGS. 3 and 4, the percussion element 27 includes a plurality of ridges 43 on the peripheral surface thereof. In the present embodiment, eight ridges 43 are formed integrally with the percussion element 27. Each ridge 43 is formed in a radial shape, extends in the meridian direction of the percussion element 27, and is equally arranged in the latitude direction. Here, the “meridian direction” is a direction along the peripheral surface of the percussion element 27 and along the virtual axis N. Further, the “latitude direction” is a direction along the peripheral surface of the percussion element 27 and orthogonal to the meridian direction. In addition, as FIG. 3 shows, the point where the outer diameter dimension of the percussion element 27 is maximum in the latitude direction is particularly defined as “equator E”.

  As shown in FIG. 4, the outer peripheral surface 44 of each ridge 43 is curved in an arc shape. In the present embodiment, the radius of curvature R1 of the outer peripheral surface 44 is set to 3.5 mm. In this case, the curvature radius R1 is a curvature radius (equatorial curvature radius) of the outer peripheral surface 44 of the ridge 43 on the equator. Moreover, the site | part 45 where the adjacent protruding item | line 43 cross | intersects is comprised by the curved surface, and, thereby, the adjacent protruding item | line 43 is continuing smoothly. The curvature radius of the curved surface constituting the portion 45 can be set to 0.5 mm, for example. However, the radius of curvature of the portion 45 is not limited to such a dimension, and can be appropriately changed in design. Of course, the portion 45 may be formed of a bent surface.

  This percussion tool 20 is used as follows. As FIG. 1 shows, since the percussion instrument 20 can be extended and contracted, when the wall surface damage inspection is not performed, (b) when the wall surface damage inspection is performed, the shortened state is performed as illustrated in FIG. a) Elongated as shown. When the percussion instrument 20 is extended, the operator grasps the percussion element 27 and the cylindrical member 25 constituting the grip, and pulls them along the axial direction so as to separate them. Since each cylindrical member 21-25 which comprises the percussion instrument 20 is assembled in the telescoping type, adjacent cylindrical members slide relatively and the percussion instrument 20 is extended. Thereby, the operator can set the percussion tool 20 to a desired length and perform a wall surface damage inspection.

  The operator brings the percussion element 27 into contact with the wall surface of the structure, which is the subject, and operates the main body 26 to roll the percussion element 27 relative to the surface of the subject. Since the percussion element 27 includes a plurality of ridges 43, when the percussion element 27 rolls on the surface of the subject, the ridges 43 collide with the surface of the subject regularly and intermittently (ie, A collision sound is generated (with a certain period). If the percussion piece has a smooth spherical shape as in the prior art, the collision sound is small. However, in the percussion piece 27 according to the present embodiment, the ridge 43 collides with the subject. It is large enough for the operator to determine whether or not the subject is damaged. In addition, since the outer peripheral surface of the ridge 43 is formed as an arc surface, the impact when each ridge 43 collides with the subject is reduced. Therefore, the operator can accurately inspect based on a loud collision sound without damaging the subject.

  In the present embodiment, eight ridges 43 are provided, but the number of ridges 43 can be set as appropriate in the range of 6 to 16. When the number of the ridges 43 is 5 or less, the impact between the ridges 43 and the subject increases, and there is a risk of scratching the subject. When the number of the ridges is 17 or more, the cycle of the collision sound is long. This is because the impact sound becomes very short as in the case where the smooth spherical percussion element rolls. In the present embodiment, the radius of curvature R1 of the outer peripheral surface of the ridge 43 is set to 3.5 mm, but may be appropriately set in the range of 2 mm to 5 mm. If the radius of curvature R1 is less than 2 mm, the ridges 43 may be sharp and the subject may be scratched. If the radius of curvature R1 exceeds 5 mm, the collision sound may be too small. . By forming the ridge 43 in such a limited shape, a sufficiently large impact sound is generated without damaging the subject, so that the operator can perform an accurate examination with peace of mind.

  The present invention can be applied to a percussion instrument used for inspecting damage to a wall surface of a building or the like.

FIG. 1 is a front view of a percussion instrument according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of a main part of the percussion instrument according to the embodiment of the present invention. FIG. 3 is a side view of a percussion piece of a percussion instrument according to an embodiment of the present invention. FIG. 4 is a plan view of a percussion piece of a percussion instrument according to an embodiment of the present invention. FIG. 5 is an external view of a conventional percussion instrument.

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 ... Percussion tool 26 ... Main body 27 ... Percussion child 28 ... Support mechanism 32 ... Support shaft 33 ... Positioning shaft 34 ... Large diameter part 35 ... Small diameter part 36 ..Screw hole 37 ... Screw portion 38 ... Head 39 ... Through hole 40 ... Large diameter hole 41 ... Small diameter hole 42 ... Lower diameter hole 43 ... Convex Strip 44 · · · outer peripheral surface 45 · · · where adjacent ridges intersect

Claims (3)

A percussion instrument for detecting wall damage,
A spherical percussion probe in contact with the wall surface;
A support mechanism for supporting the percussion piece in a rotatable state around a virtual axis passing through the center of the percussion piece,
A plurality of ridges extending in the meridian direction are juxtaposed on the circumferential surface of the percussion element along the latitude line direction, and the shape of the outer circumferential surface of each ridge is formed in an arc shape protruding outward . Percussion tool.   The percussion instrument according to claim 1, wherein the protrusions are provided in a range of 6 or more and 16 or less.   The percussion instrument according to claim 1 or 2, wherein an equator radius of curvature of the outer peripheral surface of the ridge is set to 2 mm or more and 5 mm or less.

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