Ultrasonic vibration scraper

Abstract

To provide a supersonic vibration scraper capable of enhancing fastening force when a cutting edge is fastened and fixed detachably to a horn by a fastener.SOLUTION: A supersonic vibration scraper 1 that comprises a horn 5 connected to a supersonic vibrator, a slit 31 provided atop of the horn 5, and a cutting edge 41 which is fastened and fixed detachably while inserted in part into the slit 31, and while supersonic vibrations are applied to the horn 5, the cutting edge 41 is brought into contact with an object region so as to peel and remove dirt sticking on the object region. Fastening surfaces of the slit 31 and the cutting edge 41 are given certain surface roughness.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an ultrasonic vibration scraper used for peeling and removing dirt adhering and depositing on, for example, a floor surface (e.g., a bathroom floor surface), a window glass of a building, a griddle for cooking in kitchen equipment, etc. In particular, the present invention relates to an invention in which a blade is detachably fastened and fixed to a horn by a fastener, and is devised so as to be able to enhance the fastening force thereof.

Background Art

[0002] For example, when peeling and removing dirt adhering and depositing on a floor surface, a metal scraper (metal spatula) is used while spraying water and a cleaning detergent (e.g., an alkaline detergent) onto the dirty part to scrape off the adhering and deposited dirt.

[0003] However, all of these operations are manual operations. Not only are they forced to perform troublesome operations, but there are also problems such as the need for a force such as applying an impact, and poor work efficiency.

[0004] Therefore, as a solution to such problems, an ultrasonic vibration scraper using ultrasonic vibration has been proposed. As an example disclosing the configuration of that type of ultrasonic vibration scraper, there are Patent Document 1 and the like.

[0005] In the case of the ultrasonic peeling tool according to the invention described in Patent Document 1, the ultrasonic peeling tool is detachably fastened and fixed to the ultrasonic vibrator via a connecting screw. The ultrasonic peeling tool has a narrow portion with a certain width, and the tip of the narrow portion is formed sharply to be a blade portion. By applying ultrasonic vibration to the narrow portion via the ultrasonic vibrator, the dirt adhering and depositing on the floor surface is peeled and removed through the blade portion.

[0006] By using the ultrasonic peeling tool with the above configuration, cumbersome manual work can be eliminated and work efficiency can be improved. On the other hand, when the blade part at the tip is damaged due to aging or the like, the entire ultrasonic peeling tool has to be replaced with a new one, which has a problem that a great deal of cost is incurred for maintenance and management.

[0007] Therefore, a configuration in which the blade part at the tip is made into a separate body and is detachably fastened and fixed to the ultrasonic peeling tool by a fastener is considered. As an example disclosing such a configuration, there is Patent Document 2. What is described in this Patent Document 2 is an ultrasonic cutter device, but the cutter blade is detachably fastened and fixed to the tip of the tool shank by a fixing screw.

[0008] Specifically, a slit is formed at the tip of the above-mentioned tool shank, the cutter blade is inserted into the slit, and the fixing screw is inserted from one side of the slit and screwed to the opposite side of the slit through the through hole of the cutter blade, thereby fastening and fixing the cutter blade in the slit.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0010] According to the above conventional configuration, there were the following problems. That is, in the configuration in which the fixing screw is directly screwed into the tool shank, the fastening force is insufficient, slippage occurs between the tool shank and the cutter blade, excessive heat generation is caused thereby, and the transmission of ultrasonic vibration is impaired.

[0011] The present invention has been made based on such points, and an object thereof is to provide an ultrasonic vibration scraper capable of increasing the fastening force in a device in which a blade is detachably fastened and fixed to a horn by a fastener.

Means for Solving the Problems

[0012] The ultrasonic vibration scraper according to claim 1 of the present invention for solving the above problems includes a horn connected to an ultrasonic vibrator, a slit provided at the tip of the horn, and a blade having a part thereof inserted into the slit and fastened and fixed by a fastener. By applying ultrasonic vibration to the horn and bringing the blade into contact with the target part, in the ultrasonic vibration scraper for peeling and removing the dirt adhering to the target part, the slit The upper and lower inner surfaces and the Both the front and back surfaces, the part inserted into the above slit of the blade The above-mentioned constant surface roughness is set in the range where Ra (arithmetic mean roughness) is 4 to 12 μm or Rz (ten-point mean roughness) is 8 to 20 μm are provided with a certain surface roughness, which is characterized in that. The above fasteners are two sets of bolts and nuts Further, the ultrasonic vibration scraper according to claim 2 is the ultrasonic vibration scraper according to claim 1, which is characterized in that. The above horn is drilled with a through-hole through which the above bolt passes, and counterbore holes for embedding the bolt head of the above bolt and the above nut are provided at both ends of the through-hole Further, the ultrasonic vibration scraper according to claim 3 is the ultrasonic vibration scraper according to claim 2, which is characterized in that. On the bottom surface of the above counterbore hole, uneven portions that allow only rotation in the fastening direction of the bolt or nut are provided, and the uneven portions are provided so as to be in opposite directions in two regions obtained by dividing 360° into 180° when the bottom surface of the counterbore hole is viewed from the front Further, the ultrasonic vibration scraper according to claim 4 is the ultrasonic vibration scraper according to claim 3, which is characterized in that. 1 Further, the ultrasonic vibration scraper according to claim 5 is the ultrasonic vibration scraper according to claim At the back of the above slit, a hollow portion with an oval cross-sectional shape for the purpose of imparting elasticity is provided, and fins are protruding from both the front and back surfaces of the above horn with the hollow portion in between described above, which is characterized in that. The length of the above blade is set in the range of 20 mm to 40 mm Further, the ultrasonic vibration scraper according to claim 6 is the ultrasonic vibration scraper according to claim 1,

Effects of the Invention

[0013] As described above, according to the ultrasonic vibration scraper according to claim 1 of the present invention, it comprises a horn connected to an ultrasonic vibrator, a slit provided at the tip of the horn, and a blade having a part thereof inserted into the slit and fastened and fixed by a fastener. By applying ultrasonic vibration to the horn and applying the blade to the target site, in the ultrasonic vibration scraper for peeling and removing dirt adhering to the target site, since a certain surface roughness is applied to the fastening surface of the slit and the blade, the fastening force can be increased, the occurrence of slippage between the horn and the blade can be prevented, and excessive heat generation due to slippage and loss of ultrasonic vibration transmission can be prevented. Also, according to the ultrasonic vibration scraper according to claim 2, in the ultrasonic vibration scraper according to claim 1, since the certain surface roughness is set in the range where Ra (arithmetic mean roughness) is 4 to 12 or Rz (ten-point mean roughness) is 8 to 20, the fastening force can be increased, the occurrence of slippage between the horn and the blade can be prevented, and excessive heat generation due to slippage and loss of ultrasonic vibration transmission can be prevented. Also, according to the ultrasonic vibration scraper according to claim 3, in the ultrasonic vibration scraper according to claim 1, since the fastener is a bolt and a nut, compared with the case where the bolt is directly screwed into the horn, lateral vibration can be suppressed and loss of longitudinal vibration of ultrasonic vibration can be prevented. Also, according to the ultrasonic vibration scraper according to claim 4, in the ultrasonic vibration scraper according to claim 3, a through hole through which the bolt passes is drilled in the horn, and counterbore holes for embedding the bolt head of the bolt and the nut are provided at both ends of the through hole. Therefore, protrusion of the bolt head and the nut from the outer peripheral surface of the horn can be eliminated, lateral vibration can be suppressed, and loss of longitudinal vibration of ultrasonic vibration can be prevented. Also, according to the ultrasonic vibration scraper according to claim 5, in the ultrasonic vibration scraper according to claim 4, since uneven portions that allow only rotation in the fastening direction of the bolt or the nut are provided on the bottom surface of the counterbore hole, accidental loosening of the bolt and the nut can be prevented. Further, according to the ultrasonic vibration scraper of claim 6, in the ultrasonic vibration scraper described in claim 1, a hollow portion for imparting elasticity is provided at the back of the slit, and fingers are protruded on both the front and back surfaces of the horn across the hollow portion, so that lateral vibration can be suppressed and loss of longitudinal vibration of ultrasonic vibration can be prevented. Further, according to the ultrasonic vibration scraper of claim 7, in the ultrasonic vibration scraper described in claim 1, the length of the blade is set to a length at which lateral vibration is unlikely to occur, so that loss of longitudinal vibration of ultrasonic vibration due to the occurrence of lateral vibration can be prevented. Further, according to the ultrasonic vibration scraper of claim 8, in the ultrasonic vibration scraper described in claim 7, the length of the blade is set in the range of 20 mm to 40 mm, so that loss of longitudinal vibration of ultrasonic vibration due to the occurrence of lateral vibration can be prevented.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

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Figure 8

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Figure 14

Embodiments for Carrying Out the Invention

[0015] Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 14. Fig. 1 is a perspective view showing the overall configuration of an ultrasonic vibration scraper 1 according to this embodiment. First, there is a case 3, and inside this case 3, as shown in Fig. 2, a horn 5 and an ultrasonic vibrator 7 integrated together are installed. The horn 5 and the ultrasonic vibrator 7 are integrated via a bolt joint (not shown).

[0016] A cable 9 is connected to the ultrasonic vibrator 7, and this cable 9 is drawn out to the outside of the case 3, and an output plug 11 is attached to the tip thereof. Also, a power supply unit 13 is installed, and an output connector 15 is provided on this power supply unit 13. The output plug 11 is inserted into the output connector 15.

[0017] The horn 5 described above is composed of a rear part 21, a front part 23, and a constriction part 25 connecting the rear part 21 and the front part 23. The rear part 21 is formed with a thick wall, while the front part 23 is formed with a thin wall that is approximately half as thick as the rear part 21. The constriction part 25 is formed with an even thinner wall than the front part 23. Fins 27, 27 project from both the front and back surfaces of the boundary between the constriction part 25 and the front part 23.

[0018] A slit 31 is formed in the front part 23, and a hollow part 33 with a long hole cross-sectional shape is formed at the back of this slit 31. This hollow part 33 is provided to obtain the necessary elasticity in the slit 31. The fins 27, 27 are provided at positions sandwiching the hollow part 33. This is to eliminate the drawback that ultrasonic resonance is difficult to establish by providing the hollow part 33, and also to prevent lateral vibration during operation.

[0019] A blade 41 is inserted into the slit 31 and is detachably fastened and fixed by a fastener described later. The blade 41 is set to a length (l) that is difficult to sway laterally, so that when it comes into contact with an object, it is difficult for metallic sounds or blade breakage to occur. Specifically, the length (l) is set in the range of 20 mm to 40 mm.

[0020] Through holes 51, 51 are drilled in the front part 23 of the horn 5. As shown in FIG. 6, countersunk holes 53, 53 are provided at the edges of the through holes 51 on the front side of the horn 5. Similarly, as shown in FIG. 7, countersunk holes 55, 55 are provided at the edges of the through holes 51 on the back side of the horn 5.

[0021] As shown in FIGS. 8 and 9, through holes 61, 61 are drilled in the blade 41. Further, as shown in FIG. 3, two sets of fasteners 71, 71 are provided, and the fastener 71 is composed of a bolt 73 and a hexagonal nut 75. The blade 41 is inserted into the slit 31, and the bolts 71, 71 are inserted from the front side. The bolts protrude to the back side through the through holes 51, 51 of the horn 5, the through holes 61, 61 of the blade 41, and the through holes 51, 51 of the horn 5, and hexagonal nuts 75, 75 are screwed thereto. Thereby, the blade 41 is fastened and fixed in the slit 31 of the horn 5.

[0022] As shown in FIG. 10, in the case of the ultrasonic vibration scraper 1 according to the present embodiment, longitudinal vibration (indicated by arrow a in FIG. 10) is fundamental. At that time, when adopting a configuration in which a female screw portion is provided in the hole of the horn and a bolt is directly screwed as in the conventional case, lateral sway occurs and the longitudinal vibration is wasted. Therefore, in the case of the present embodiment, a fastening structure using fasteners 71, 71 composed of bolts 73, 73 and hexagonal nuts 75, 75 is adopted. Thereby, the waste of longitudinal vibration caused by the occurrence of the lateral sway is prevented.

[0023] The bolt heads of the bolts 73, 73 are buried in the counterbores 53, 53 and do not protrude outside the horn 5. The hexagonal nuts 75, 75 are also buried in the counterbores 55, 55 and do not protrude outside the horn 5. Also by this, the waste of longitudinal vibration caused by the occurrence of the lateral sway is prevented. Further, the protruding portion outside the outer peripheral surface of the horn 5 is eliminated to improve workability.

[0024] A certain surface roughness is provided on both the upper and lower inner surfaces of the slit 31. Also, a certain surface roughness is provided on both the front and back surfaces of the blade 41 at the portion inserted into the slit 31. As means for providing the certain surface roughness, for example, wire electrical discharge machining, shot blasting, etc. are available. The certain surface roughness is set, for example, in the range where Ra (arithmetic mean roughness) is 4 to 12 or Rz (ten-point mean roughness) is 8 to 20. In FIG. 9, the surface roughness portions on the front side of the blade 41 are shown as dots, but actually, the surface roughness is such that it is difficult to visually recognize with the naked eye.

[0025] With such a configuration, the minute irregularities in the surface roughness of the fastening surface of the slit 31 and the minute irregularities in the surface roughness of the fastening surface of the blade 41 engage with each other, and the fastening force when fastening and fixing with the fasteners 71, 71 can be increased. If the surface roughness is too small, when ultrasonic vibration is applied, the fastening force cannot be maintained and slipping occurs, resulting in loss of vibration transmission and excessive heat generation. Conversely, if the surface roughness is too large, the transmission of ultrasonic vibration is lost due to insufficient grounding surface, resulting in loss of transmission. Therefore, it is possible to prevent the occurrence of slipping between the horn 5 and the blade 41, eliminate excessive heat generation caused by slipping, and eliminate the loss of transmission of ultrasonic vibration.

[0026] Regarding the counterbores 55, 55 on the side of the hexagonal nuts 75, 75, as also shown in FIG. 12, the pair of straight portions 55a, 55a are directed in a direction parallel to the direction of longitudinal vibration. This is also for preventing the loss of longitudinal vibration in the ultrasonic vibration scraper 1 and for suppressing blade breakage and heat generation. Incidentally, as shown in FIG. 11, if the pair of straight portions 55a, 55a were directed in a direction perpendicular to the direction of longitudinal vibration, the longitudinal vibration in the ultrasonic vibration scraper 1 would be lost, and heat generation would be a concern.

[0027] The structure of the bottom surfaces of the bolts 73, the counterbores 53, 53 on the 73 side, the hex nuts 75, and the counterbores 55, 55 on the 75 side will be described. As shown in Fig. 13(a), the bottom surfaces of the counterbores 53, 53 are provided with different concave and convex portions 81, 83 on the left half and the right half. The concave and convex portion 81 has a concave and convex shape in the direction shown in Fig. 13(c), and for example, when the bolt 73 tries to rotate counterclockwise (the loosening direction), it acts to restrict this. On the other hand, the concave and convex portion 83 has a concave and convex shape in the direction shown in Fig. 13(d), and for example, when the bolt 73 tries to rotate clockwise (the tightening direction), it acts to allow this. Such an action functions effectively when longitudinal vibration due to ultrasonic vibration occurs. When the bolt 73 tries to rotate clockwise due to the expansion and contraction of the longitudinal vibration, this is allowed, and when it tries to rotate counterclockwise, this is restricted. As a result, accidental loosening of the bolt 73 can be prevented.

[0028] This is the same for the bottom surfaces of the counterbores 55, 55 as shown in Fig. 13(b). The bottom surfaces of the counterbores 55, 55 are provided with different concave and convex portions 85, 87 on the left half and the right half. The concave and convex portion 85 has a concave and convex shape in the direction shown in Fig. 13(c), and for example, when the hex nut 75 tries to rotate counterclockwise (the loosening direction), it acts to restrict this. On the other hand, the concave and convex portion 87 has a concave and convex shape in the direction shown in Fig. 13(d), and for example, when the hex nut 75 tries to rotate clockwise (the tightening direction), it acts to allow this. Such an action functions effectively when longitudinal vibration due to ultrasonic vibration occurs. When the hex nut 75 tries to rotate clockwise due to the expansion and contraction of the longitudinal vibration, this is allowed, and when it tries to rotate counterclockwise, this is restricted. As a result, accidental loosening of the nut 75 can be prevented.

[0029] Based on the above configuration, its operation will be described. As shown in Fig. 14, while holding the ultrasonic vibration scraper 1 according to the present embodiment with the hand 90, the blade 41 is pressed against the object 91 at a predetermined inclination angle. In this state, while applying ultrasonic vibration, as shown in Figs. 14(a), 14(b), and 14(c), it is gradually moved forward. Thereby, the dirt 93 adhering and depositing on the object 91 is peeled off and removed.

[0030] As described above, according to the present embodiment, the following effects can be achieved. First, since the configuration is adopted in which the blade 41 is detachably provided at the tip of the horn 5, even if the blade 41 is damaged due to aging or the like, only the blade 41 needs to be removed and replaced with a new blade 41, and the cost required for maintenance and management can be reduced. Also, an appropriate blade 41 can be selected according to the type, material of the object 91, and the state of adhesion and deposition of the adhering matter. Also in that case, only the blade 41 at the tip needs to be appropriately replaced, and the cost required for maintenance and management can be reduced. Also, the blade 41 is inserted into the slit 31 of the horn 5 and fastened and fixed by two sets of fasteners 71, 71. At that time, a certain surface roughness is provided on the upper and lower surfaces of the slit 31 and the front and back surfaces of the blade 41, so a strong fastening state can be obtained. Thereby, the occurrence of slippage between the horn 5 and the blade 41 can be prevented, and excessive heat generation and loss of ultrasonic vibration transmission due to slippage can be prevented. Also, since the surface roughness is set in the range where Ra (arithmetic mean roughness) is 4 to 12 or Rz (ten-point mean roughness) is 8 to 20, the above effects can be surely obtained. Also, the length (l) of the blade 41 is set in a range where it is difficult to sway laterally, particularly in the range of 20 mm to 40 mm, so that even when it comes into contact with the object 91, it is difficult to generate a metallic sound or breakage of the blade. Also, the portions through which the bolts 73, 73 of the blade 41 pass are through holes 61, 61, so even if the fastening becomes loose, the blade 41 will not pop out. Incidentally, when the portion through which the bolts 73, 73 pass is a U-shaped notch, there is a concern that the blade 41 may pop out because the fastening may become loose. Also, since the head of the bolt 73 does not protrude from the countersink hole 53 and the hexagonal nut 75 also does not protrude from the countersink hole 55, it is possible to prevent distortion from occurring in the longitudinal vibration characteristics of the ultrasonic vibration. Also, since the head of the bolt 73 does not protrude from the countersink hole 53 and the hexagonal nut 75 also does not protrude from the countersink hole 55, workability can also be improved. Also, since a hollow portion 33 is provided at the back of the slit 31 in order to obtain the necessary elasticity in the slit 31, the necessary elasticity can be obtained in the slit 31, and thereby the blade 41 can be clamped. Also, since fins 27, 27 are provided on both the front and back sides of the hollow portion 33, it is possible to eliminate the drawback that ultrasonic resonance is difficult to occur by providing the hollow portion 33, and it is possible to prevent lateral runout during operation. Also, since uneven portions 81, 83 with different orientations are provided on the bottom surfaces of the countersink holes 53, 53, inadvertent loosening of the bolt 73 can be prevented. Similarly, since uneven portions 85, 87 with different orientations are provided on the bottom surfaces of the countersink holes 55, 55, inadvertent loosening of the hexagonal nut 75 can be prevented. This functions effectively when longitudinal vibration due to ultrasonic vibration occurs, and can prevent inadvertent loosening of the bolt 73 and nut 75 caused by expansion and contraction due to the longitudinal vibration.

[0031] Note that the present invention is not limited to the above-described embodiment. First, the shape of the horn is not limited to that shown in the above-described embodiment, and various shapes are conceivable. Also, in the above-described embodiment, an example using two sets of fasteners has been described, but cases of three sets or more are also conceivable. In addition, the illustrated configuration is merely an example.

Industrial Applicability

[0032] The present invention relates to an ultrasonic vibration scraper used for peeling and removing dirt adhering and depositing on, for example, a floor surface (e.g., a bathroom floor surface), a window glass of a building, a griddle of kitchen equipment, etc. In particular, in the case where a blade is detachably fastened and fixed to a horn by a fastener, the present invention is devised so as to enhance the fastening force thereof, and is suitable for, for example, the work of peeling and removing dirt adhering and depositing on a bathroom floor surface.

Explanation of reference numerals

[0033] 1 Ultrasonic vibration scraper 5 Horn 7 Ultrasonic vibrator 27 Fin 31 Slit 33 Hollow part 41 Blade 53 Countersink hole 55 Countersink hole 71 Fastener 73 Bolt 75 Hexagonal nut (nut)

Claims

1. A horn connected to an ultrasonic vibrator, a slit provided at the tip of the horn, a blade having a part thereof inserted into the slit and fastened and fixed by a fastener, characterized in that, in the ultrasonic vibration scraper for peeling and removing dirt adhering to the target part by applying the blade to the target part while applying ultrasonic vibration to the horn, a certain surface roughness is applied to both the upper and lower inner surfaces of the slit and both the front and back surfaces of the blade at the part inserted into the slit, the ultrasonic vibration scraper is characterized in that the certain surface roughness is set in a range where Ra (arithmetic mean roughness) is 4 to 12 μm or Rz (ten-point mean roughness) is 8 to 20 μm.

2. The ultrasonic vibration scraper according to Claim 1, characterized in that the fastener is two sets of bolts and nuts.

3. The ultrasonic vibration scraper according to Claim 2, characterized in that a through hole through which the bolt passes is drilled in the horn, and counterbores for embedding the bolt head of the bolt and the nut are provided at both ends of the through hole.

4. The ultrasonic vibration scraper according to Claim 3, characterized in that uneven portions that allow only rotation in the fastening direction of the bolt or nut are provided on the bottom surface of the counterbore, and the uneven portions are provided so as to be in opposite directions in two regions obtained by dividing 360° into 180° when the bottom surface of the counterbore is viewed from the front.

5. The ultrasonic vibration scraper according to Claim 1, characterized in that a hollow portion having an oval cross-sectional shape for the purpose of imparting elasticity is provided at the back of the slit, and fins are provided protruding from both the front and back surfaces of the horn with the hollow portion interposed therebetween.

6. The ultrasonic vibration scraper according to Claim 1, characterized in that the length of the blade is set in the range of 20 mm to 40 mm.

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