Tool for removing foreign matter adhering to male screw

Abstract

To provide a tool that can remove foreign matter adhering to a taper screw to suppress breakage of the screw and suppress clogging with foreign matter.SOLUTION: A tool for removing foreign matter adhering to a male screw includes: a die part 200 which has a plurality of die pieces 220 each having a female screw part to be screwed with a male screw, and which is openable and closable; a spring part 300 for biasing at least one of the die pieces 220 so that the die part 200 is closed, the spring part 300 configured to allow adjustment of biasing force; and a housing 400 including a foreign matter discharge passage 450 through which the foreign matter removed from the male screw passes, and a male screw discharge passage 470 through which the male screw from which the foreign matter has been removed and which has detached from a female screw part by opening of the die part 200 passes, the housing 400 accommodating the die part 200 and the spring part 300.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a jig for removing foreign matter adhering to a male thread. [Background technology]

[0002] Various techniques have been proposed for removing foreign matter such as rust and sealing tape from threads. For example, Patent Document 1 discloses a screw hole cleaner that has a tap that engages with the female thread to scrape off foreign matter adhering to the female thread. The scraped-off foreign matter is discharged through a groove in the tap. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-213540 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the threaded hole cleaning tool disclosed in Patent Document 1 can clean straight-type threaded holes, but cannot clean tapered-type threaded holes. Furthermore, if the diameter of the tap is too large, there is a risk of damaging the female thread. Furthermore, there is a risk of foreign matter removed from the female thread becoming clogged in the groove. These issues can also arise when the technology of Patent Document 1 is applied to a male thread cleaning tool with a structure corresponding to that of the female thread cleaning tool. [Means for solving the problem]

[0005] The present disclosure can be realized in the following forms.

[0006] According to one aspect of the present disclosure, there is provided a jig for removing foreign matter adhering to a male thread, the jig comprising: a die section having a plurality of die pieces each having a female thread portion that threadably engages with the male thread and configured to be openable and closable; a spring section configured to bias at least one of the die pieces to close the die section and configured to adjust the biasing force; and a housing that contains the die section and the spring section, the housing having a foreign matter discharge passage through which the foreign matter removed from the male thread passes, and a male thread discharge passage through which the male thread passes when the male thread is freed of the foreign matter and separated from the female thread portion as the die section opens. With this type of jig, the spring biases the die piece, so that the diameter of the die expands in accordance with the diameter of the male screw, allowing the male screw, whether straight or tapered, to be inserted into the die and for the female screw portion to be threaded with the male screw. Furthermore, because the spring portion is configured to have an adjustable biasing force, the force applied to the male screw from the die portion can be adjusted according to the diameter of the male screw and the properties of the foreign matter, which prevents the threads of the male screw from being damaged by a strong force, and prevents foreign matter from remaining in the male screw by a weak force. Furthermore, the housing is provided with a foreign matter discharge passage through which foreign matter removed from the male thread passes, allowing the foreign matter to be discharged to the outside of the housing, thereby preventing the removed foreign matter from accumulating in the die section. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view showing a jig for removing foreign matter adhering to a male thread according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a plan view of a die unit attached to a housing. [Figure 3] FIG. 2 is a cross-sectional view showing the cross section III-III of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] A. Implementation: A1.Device configuration: FIG. 1 is a perspective view showing a jig 100 (hereinafter also referred to as removal jig 100) for removing foreign matter attached to a male thread according to one embodiment of the present disclosure. The removal jig 100 is used to reuse a male thread by removing the foreign matter from the male thread. The foreign matter may be, for example, residue from a sealing tape or gasket that fills the gap between the male thread and the female thread. In this disclosure, "removing foreign matter" includes not only removing all of the foreign matter attached to the male thread, but also removing some of the foreign matter attached to the male thread. The removal jig 100 includes a die unit 200, a spring unit 300, a housing 400, a male screw recovery unit 500, and a housing fixing unit 600.

[0009] (Configuration of the die section 200) FIG. 2 is a plan view of the die unit 200 attached to the housing 400. The die unit 200 removes foreign matter adhering to the male thread. The die unit 200 has a pair of die pieces 210, 220. The die pieces 210, 220 are attached to a recess 410 provided on the top surface of the housing 400 so that a pair of protrusions 420 are sandwiched between the die pieces. The die pieces 210, 220 have an arc-shaped shape in plan view. The die pieces 210, 220 are produced by dividing a die into two. The die pieces 210, 220 have a female thread portion 230 and a foreign matter passage portion 240.

[0010] The female thread portion 230 has a thread that screws together with the male thread and protrudes radially inward of the die portion 200. When the male thread and the female thread portion 230 screw together, foreign matter adhering to the male thread is removed. In this embodiment, two female thread portions 230 are provided on each of the die pieces 210 and 220.

[0011] The foreign matter passing portion 240 is a groove through which foreign matter removed from the male thread passes. The foreign matter passing portion 240 is formed by carving out an arc-shaped portion from the inner circumferential side toward the outer circumferential side of the inner circumferential surface of the die pieces 210, 220. In this embodiment, the foreign matter passing portion 240 includes a first foreign matter passing portion 241 and a second foreign matter passing portion 242. The first foreign matter passing portion 241 is a portion cut out along an arc that is longer than the second foreign matter passing portion 242. In this embodiment, one first foreign matter passing portion 241 is provided for each of the die pieces 210, 220. Two second foreign matter passing portions 242 are provided for each of the die pieces 210, 220, sandwiching the first foreign matter passing portion 241.

[0012] The die unit 200 is configured to be openable and closable. Specifically, the die unit 200 is configured to be switchable between a "closed state," in which it is closed, and an "open state," in which it is open. In the "closed state," the die pieces 210, 220 are brought closer to each other by the biasing force of the spring unit 300, which will be described later, so that the male screw inserted into the die unit 200 can be clamped. In the "open state," the die pieces 210, 220 are brought farther apart, so that the male screw inserted into the die unit 200 cannot be clamped.

[0013] (Configuration of spring part 300) 3 is a cross-sectional view showing the III-III cross section of FIG. 1. The spring portion 300 biases the die pieces 220 so that the die portion 200 closes. The spring portion 300 is provided so as to penetrate the edge 430 of the recess 410 along the radial direction of the cylindrical housing 400. The spring portion 300 has a spring body 310 and an adjustment screw 320.

[0014] The spring body 310 is disposed between the die piece 220 and the edge 430. One end of the spring body 310 is connected to the die piece 220, and the other end is connected to the adjusting screw 320. The spring body 310 is a member having elasticity, such as a coil spring.

[0015] The adjustment screw 320 adjusts the biasing force of the spring body 310. The adjustment screw 320 is disposed to pass through a through-hole 440 provided in the edge 430. A threaded portion that screws into the adjustment screw 320 is formed on the inner wall of the through-hole 440. When the adjustment screw 320 is tightened, the biasing force of the spring body 310 is increased, and when the adjustment screw 320 is loosened, the biasing force of the spring body 310 is decreased.

[0016] (Configuration of the housing 400) The housing 400 houses the die portion 200 and the spring portion 300 described above. A recess 410 is provided in the upper part of the housing 400. The die pieces 220 are housed in the recess 410 so as to leave a gap on the radially outer side of the housing 400. The housing 400 has a cylindrical external shape. The housing 400 is provided with a foreign matter discharge path 450, a slope portion 455, a foreign matter collection portion 460, and a male thread discharge path 470.

[0017] Foreign matter discharge path 450 is a tubular flow path through which foreign matter 710 removed from male thread 700 passes. Foreign matter discharge path 450 is provided inside housing 400 so as to slope from the bottom of recess 410 toward slope portion 455, which will be described later. In this embodiment, two foreign matter discharge paths 450 are provided, sandwiching male thread discharge path 470, which will be described later.

[0018] Slope section 455 guides foreign matter 710 that has passed through foreign matter discharge path 450 to foreign matter recovery section 460. Slope section 455 is a smooth slope provided on the outer peripheral surface of housing 400. The slope of slope section 455 is smaller than the slope of foreign matter discharge path 450. This allows the falling speed of foreign matter 710 to be slower compared to a configuration in which slope section 455 is not provided.

[0019] The foreign matter collection portion 460 receives the foreign matter 710 removed from the male thread 700. The foreign matter collection portion 460 has a disk-like external shape. The outer diameter of the foreign matter collection portion 460 is larger than the outer diameter of the other parts of the housing 400. An edge portion 465 is provided on the outer periphery of the foreign matter collection portion 460. The edge portion 465 prevents the foreign matter 710 from flying out of the foreign matter collection portion 460.

[0020] The male thread discharge path 470 is a tubular flow path through which the male thread 700 passes after foreign matter 710 has been removed. As shown in Fig. 2, one end of the male thread discharge path 470 is provided at the bottom of the recessed portion 410, and is located near the center of the diameter of the housing 400. As shown in Fig. 3, the male thread discharge path 470 is provided inside the housing 400, extending from the bottom of the recessed portion 410 toward the male thread recovery section 500, which will be described later. More specifically, the male thread discharge path 470 extends linearly from the bottom of the recessed portion 410 to a position at the same height as the foreign matter recovery section 460, and then extends at an angle toward the male thread recovery section 500.

[0021] (Configuration of male screw recovery unit 500) The male screw recovery portion 500 receives the male screw 700 that has been removed of foreign matter 710 and discharged from the male screw discharge path 470. The male screw recovery portion 500 is connected to the lower part of the housing 400. The male screw recovery portion 500 includes a bottom surface 510, a pair of side walls 520, 530, a rear wall 540, and a front wall 550.

[0022] The bottom surface 510 is a surface on which the male screw 700 is placed. The bottom surface 510 has a rectangular external shape. The bottom surface 510 is disposed so that its short side is close to the housing 400.

[0023] The pair of side walls 520, 530 prevent the male screw 700 from protruding from both ends of the male screw recovery portion 500. The pair of side walls 520, 530 are provided to rise from each long side of the bottom surface 510. The height of the pair of side walls 520, 530 gradually increases in the direction away from the housing 400 and becomes constant halfway through. The pair of side walls 520, 530 have a trapezoidal external shape in a plan view.

[0024] The rear wall 540 prevents the male screws 700 discharged from the male screw discharge passage 470 from jumping out of the male screw recovery section 500. The rear wall 540 has a rectangular external shape. The rear wall 540 is provided so that its long sides rise from the short sides of the bottom surface 510 that are farther from the housing 400. Each of the short sides of the rear wall 540 is continuous with each of the pair of side walls 520, 530.

[0025] The front wall 550 is provided to rise from the edge of the bottom surface 510 on the housing 400 side. The height of the front wall 550 is lower than the position of the end portion on the outlet side of the male thread discharge path 470. The front wall 550 is continuous with the pair of side walls 520, 530 at both ends.

[0026] (Configuration of housing fixing part 600) The housing fixing part 600 fixes the position of the housing 400 by magnetic force. The housing fixing part 600 is provided with a switch (not shown). The switch can switch the magnetic force between on and off. Operating the switch switches between fixing and releasing the fixing of the housing 400. The housing fixing part 600 supports the housing 400 so as to surround part of the outer periphery of the lower part of the housing 400.

[0027] A2. Removal of foreign matter 710 attached to male thread 700: The procedure for removing the foreign matter 710 using the removal jig 100 described above will be described with reference to FIG. 3 . First, the die unit 200 is closed. Next, the male screw 700 is inserted vertically into the die unit 200. In this embodiment, the male screw 700 is a conical tapered thread. When the male screw 700 is rotated and pushed in with a screwdriver or the like, the threads of the male screw 700 and the female thread portions 230 of the die pieces 210 and 220 thread together, and the die unit 200 advances into the housing 400. The die unit 200 expands according to the diameter of the male screw 700 that threads into the female thread portion 230. Specifically, the male screw 700 pushes the die piece 220 in the direction opposite to the direction of the biasing force of the spring unit 300, causing the die unit 200 to expand according to the tapered shape of the male screw 700. The foreign matter 710 is scraped out from the male screw 700 by the engagement of the female screw portion 230 with the male screw 700. The scraped out foreign matter 710 passes through the foreign matter passage portion 240 of the die pieces 210, 220 and the foreign matter discharge path 450, and reaches the foreign matter recovery portion 460.

[0028] When the male screw 700 reaches the lower end of the die section 200, the die section 200 opens. This causes the male screw 700 to separate from the female screw section 230. The male screw 700 passes through the male screw discharge passage 470 and reaches the male screw recovery section 500.

[0029] According to the removal jig 100 described above, the spring portion 300 biases the die piece 220, so that the diameter of the die portion 200 can be expanded in accordance with the diameter of the male screw 700. As a result, whether the male screw 700 is a straight screw or a tapered screw, the male screw 700 can be inserted into the die portion 200, and the female screw portion 230 and the male screw 700 can be screwed together.

[0030] Furthermore, because the spring portion 300 is configured to have an adjustable biasing force, the force applied to the male screw 700 from the die portion 200 can be adjusted according to the diameter of the male screw 700 and the properties of the foreign matter 710. This makes it possible to prevent the threads of the male screw 700 from being damaged by a strong force, and to prevent the foreign matter 710 from remaining in the male screw 700 by a weak force.

[0031] Furthermore, the housing 400 is provided with a foreign matter discharge path 450 through which the foreign matter 710 removed from the male thread 700 passes, so that the foreign matter 710 can be discharged to the outside of the housing 400. This prevents the removed foreign matter 710 from accumulating in the die section 200.

[0032] Furthermore, since the foreign matter discharge path 450 and the male screw discharge path 470 are provided in the housing 400, the foreign matter 710 and the male screw 700 can be collected separately. This makes it easy to dispose of the foreign matter 710 and reuse the male screw 700.

[0033] Furthermore, foreign matter 710 can be easily removed simply by threading male screw 700 into die part 200.

[0034] B. Other Embodiments: (B1) In the above embodiment, the die section 200 has two die pieces 210, 220, and one spring section 300 is provided. However, the number of die pieces is not limited to two, and may be any number of three or more. Furthermore, the number of spring sections 300 is not limited to one, and may be any number of two or more. When multiple spring sections 300 are provided, at least one of the spring sections 300 may bias a die piece. Furthermore, the spring section 300 may bias multiple die pieces.

[0035] (B2) In the above embodiment, the male thread 700 may be a plug cap, a seal plug, or the like.

[0036] (B3) In the above embodiment, the foreign matter collection section 460, the male screw collection section 500, and the housing fixing section 600 may each be omitted.

[0037] (B4) In the above embodiment, two foreign object discharge paths 450 are provided. However, the number of foreign object discharge paths 450 is not limited to two and may be one. Alternatively, any number of foreign object discharge paths, three or more, may be provided.

[0038] The present disclosure is not limited to the above-described embodiments and can be realized in various configurations without departing from the spirit thereof. For example, the technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention section can be appropriately replaced or combined to solve some or all of the above-described problems or achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0039] 100...removal jig, 200...die portion, 210, 220...die pieces, 230...female thread portion, 240...foreign object passage portion, 241...first foreign object passage portion, 242...second foreign object passage portion, 300...spring portion, 310...spring body, 320...adjusting screw, 400...casing, 410...recess, 420...projection portion, 430...edge, 440...through hole, 450...foreign object discharge path, 455...slope portion, 460...foreign object collection portion, 465...edge portion, 470...male screw discharge path, 500...male screw collection portion, 510...bottom surface, 520, 530...side wall, 540...rear wall, 550...front wall, 600...casing fixing portion, 700...male screw, 710...foreign object

Claims

[Claim 1] A jig for removing foreign matter attached to a male thread, a die unit having a plurality of die pieces each having a female screw portion that is threadedly engaged with the male screw, and configured to be openable and closable; a spring portion that biases at least one of the die pieces so that the die portion closes, the spring portion being configured to adjust the biasing force; a housing provided with a foreign matter discharge passage through which the foreign matter removed from the male thread passes, and a male thread discharge passage through which the male thread passes when the male thread is in a state in which the foreign matter has been removed and the male thread has separated from the female thread portion as a result of the die portion opening, the housing housing accommodating the die portion and the spring portion; A jig for removing foreign matter adhering to a male thread.

Images