JP2005249766A - Sensor fixing nut and sensor fixing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply and easily install a sensor even in a narrow space, and moreover surely prevent looseness caused by vibration or the like. <P>SOLUTION: As a fixing structure for sensors to be adopted when a displacement sensor 1 is fitted to a metal plate (A) into a state being buried in it, a peripheral thread 10a is formed on the cylindrical case 10 of the displacement sensor 1. Moreover, the fixing structure is provided with a pair of fixing nuts 2, 2 each of which has in its center a large-diameter tapped hole 20a for the peripheral thread 10a of the cylindrical case 10 of the displacement sensor 1 to be screwed in, and a small-diameter tapped hole 20c penetrating axially in at least one side of the large-diameter tapped hole 20a, and locking screws 3, 3 to be screwed into the individual small-diameter holes 20c, 20c. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sensor fixing nut and a sensor fixing structure used when a sensor is attached to a metal plate or the like in an embedded state.

  Conventionally, as a displacement sensor fixing structure in which a displacement sensor for detecting a displacement of a position of a material or the like is embedded in a metal plate, a screw portion is provided on the outer periphery of a cylindrical case 10 of the displacement sensor 1 as shown in FIG. And a pair of nuts N and N that are screwed into the screw portions 10a and tighten the metal plate A from both sides, and a toothed washer S interposed between the nuts N and N. It has become.

  When the displacement sensor 1 is embedded in the metal plate A, the nut N and the toothed washer S are removed from the screw portion 10a of the cylindrical case 10, and the cylindrical case 10 is attached to the metal from the removed screw side. Insert and penetrate through the through hole a of the plate A, screw one nut N into the insertion side screw portion 10a via the toothed washer S, and firmly tighten the metal plate A with the pair of nuts N and N Thus, the displacement sensor 1 is attached to the metal plate A.

Problems to be solved by the invention

  However, in the displacement sensor fixing mechanism described above, the nuts N and N need to be firmly tightened and fixed. For this reason, a jig such as a large spanner is required. However, since this type of displacement sensor 1 is mostly installed inside a narrow machine, it is very difficult to perform a fixing operation using a large spanner. was there. Further, even if a toothed washer S for preventing looseness is used, there is a problem that loosening occurs due to vibration of the machine. As a solution to this problem, if the nuts N and N are tightened excessively, a cylindrical case 10 made of brass is used. There was also a problem of deforming the screws.

  Accordingly, an object of the present invention is to provide a sensor fixing nut and a sensor fixing structure that can easily and easily install the sensor even in a narrow space, and that can reliably prevent loosening due to vibration or the like.

Means for solving the problem

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is characterized in that at least one of the large-diameter screw holes in the nut body having a large-diameter screw hole screwed into the outer peripheral screw of the cylindrical case in the sensor at the center. A small-diameter screw hole for a lock screw penetrating in the axial direction is provided on the side portion.

  Further, the invention according to claim 2 of the present application provides a sensor fixing structure used when the sensor is embedded in a metal plate or the like, while an outer peripheral screw is provided on the cylindrical case of the sensor, while the cylinder of the sensor is at the center. A pair of fixing nuts having a large-diameter screw hole threadedly engaged with the outer peripheral screw of the case and having a small-diameter screw hole penetrating in the axial direction at least on one side of the large-diameter screw hole, and each small-diameter screw hole The cylindrical case of the sensor is inserted into a through hole of a metal plate or the like, and a fixing nut is screwed to both ends of the outer peripheral screw to attach the metal plate or the like. The fixing nut is locked so as not to be loosened by being pinched and screwing a lock screw into each small diameter screw hole and pressing the tip of the lock screw against a metal plate or the like.

  Further, the invention according to claim 3 of the present application covers the outer periphery of the lock screw according to claim 2 with nylon or the like excellent in loosening prevention, and a hexagonal hole portion into which an L wrench having a hexagonal cross section can be engaged at the top. It is provided with.

The invention's effect

  According to the fixing nut of the sensor of the present invention described above, after inserting the cylindrical case of the sensor into a through hole such as a metal plate, the fixing nut is lightly screwed to both ends of the outer peripheral screw. Even if the fixing nut is a narrow space by sandwiching a metal plate etc., and lightly tightening a lock screw into each small diameter screw hole with a small L wrench etc. and pressing the tip of the lock screw against the metal plate etc. It can be easily and easily locked.

  Further, according to the sensor fixing structure of the present invention described above, after inserting the cylindrical case of the sensor into a through hole such as a metal plate and penetrating it, the fixing nuts are lightly screwed at both ends of the outer peripheral screw. The fixing nut can be locked so that it cannot be loosened by sandwiching a metal plate or the like, and lightly tightening a lock screw into each small diameter screw hole with a small L wrench and pressing its tip against the metal plate or the like . As a result, it is not necessary to strongly tighten the fixing nut, and even in a narrow space, the sensor can be easily and easily installed using a small L wrench or the like, and loosening due to vibration or the like can be effectively prevented.

  Furthermore, if the outer periphery of the lock screw is covered with nylon, etc., which is excellent in loosening prevention, and has a hexagonal hole that can be engaged with an L wrench with a hexagonal cross section on the top, the lock screw is cross-sectioned into each small-diameter screw hole. It is preferable because each fixing nut can be locked to the cylindrical case more securely without being loosened only by lightly screwing with a hexagonal L wrench.

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show a nut 2 for fixing the displacement sensor 1 used when the displacement sensor 1 for detecting the displacement of the position of the material X as shown in FIG. The fixing nut 2 has at least one side of the large-diameter screw hole 20a in the hexagonal nut body 20 having a large-diameter screw hole 20a screwed to the outer peripheral screw 10a of the cylindrical case 10 in the displacement sensor 1 at the center. A semicircular bulging portion 20b is formed in the portion, and a small diameter screw hole 20c for a lock screw penetrating in the axial direction is provided in the bulging portion 20b.

  Note that the fixing nut 2 is continuously manufactured from a blank in a predetermined shape to a predetermined shape by a tapping former, drilling, female thread forming by rolling, and 100% inspection of female threads in a consistent manner.

  3 and 4 show a displacement sensor fixing structure using the fixing nut 2 described above. In this displacement sensor fixing structure, the cylindrical case 10 of the displacement sensor 1 is provided with an outer peripheral screw 10a, while the above-described pair of fixing nuts 2 and 2 and a lock screw 3, which is screwed into the small diameter screw holes 20c and 20c. 3. Then, after inserting the cylindrical case 10 of the displacement sensor 1 into the through hole a of the metal plate A and penetrating it, the fixing nuts 2 and 2 are lightly screwed to both ends of the outer peripheral screw 10a, respectively. And the locking screws 3 and 3 are lightly screwed into the small-diameter screw holes 20c and 20c, and the tips of the locking screws are pressed against the metal plate, thereby exerting a tensile force between the fixing nut and the outer peripheral screw 10a. It is configured to lock so as not to loosen when given. Each lock screw 3 is coated on its outer peripheral surface with nylon or the like excellent in loosening prevention, and has a hexagonal hole portion 3a in which an L wrench 4 having a hexagonal cross section can be engaged.

  Next, the operation of the displacement sensor fixing nut and the displacement sensor fixing structure will be described.

  When the displacement sensor 1 is attached to the metal plate A in an embedded shape, first, one fixing nut 2 is removed from the outer peripheral screw 10a of the cylindrical case 10 in the displacement sensor 1, and the cylindrical case 10 is made of metal from the removed screw side. It is inserted through the through hole a of the plate A and penetrated. Next, while the other nut 2 is pressed against the metal plate A, the removed one nut 2 is lightly screwed into the insertion side screw portion 10a, and the metal plate A is fixed with the pair of fixing nuts 2 and 2. Pinch. In this case, it is not necessary to tighten the metal plate A more strongly with the fixing nuts 2 and 2. Thereafter, the lock screws 3 and 3 are lightly tightened in the small-diameter screw holes 20c and 20c with an L wrench 4 having a hexagonal cross section, and the tips of the lock screws 3 and 3 are pressed against the metal plate A. As a result, a tension force is applied between the fixing nut 2 and the outer peripheral screw 10a of the cylindrical case 10, so that the fixing nuts 2 and 2 are surely not loosened with respect to the cylindrical case. Can be locked to.

  Therefore, it is not necessary to tighten and fix the pair of fixing nuts 2 and 2 as in the conventional case, and a jig such as a large spanner is not required. As a result, it can be easily installed inside a narrow machine, and the problem of deforming the screw 10a of the brass cylindrical case 10 is eliminated. In addition, by pressing the tips of the lock screws 3 and 3 against the metal plate A, a tension force is applied between the fixing nut 2 and the outer peripheral screw 10 a of the cylindrical case 10. As a result, even if the machine vibrates, the fixing nuts 2 and 2 can be securely locked to the cylindrical case 10 without being loosened. Furthermore, the lock screw 3 has a configuration in which the outer periphery of the lock screw 3 is covered with nylon excellent in loosening prevention, and a hexagonal hole portion 3a in which an L wrench 4 having a hexagonal cross section can be engaged is provided on the upper portion. By simply screwing lightly into the hole 20c with the L wrench 4, the fixing nut 2 can be more securely locked to the cylindrical case 10 without loosening.

  In the above-described embodiment, the displacement sensor 1 is fixed to the metal plate A in an embedded state. However, the displacement sensor 1 is not limited to the metal plate A and has an appropriate thickness that can support the displacement sensor 1 in an embedded state. Of course, it may be a member.

  Further, the number of small-diameter screw holes 20c provided in the fixing nut 2 is not limited to one as in the above-described embodiment, but, for example, a plurality (three in the figure) as shown in FIGS. Also good.

  7 and 8 show another embodiment of the fixing nut. Instead of the hexagonal fixing nut 2, a cylindrical case 10 in the displacement sensor 1 is provided at the center of the circular nut body 20. FIG. This is applied to a fixing nut 2A having a large-diameter screw hole 20a screwed into the outer peripheral screw 10a and provided with a serration 20b on the outer peripheral side portion. In that case, small-diameter screw holes 20c, 20c, and 20c for lock screws penetrating in the axial direction at equal angles are provided at three positions on the side of the large-diameter screw hole 20a. In addition, the shape of the fixing nut is not limited, and may be a polygon or an irregular shape.

  The sensor in each claim is not limited to the displacement sensor described above, but is a detection sensor or a detection switch for detecting the presence or absence of an article, or a detection sensor for detecting this when moving to a certain distance or a proximity for stopping the operation. It is a concept that includes switches and the like. Furthermore, the fixing nut 2 described above is not limited to the fixing of the sensor, but can be applied to other cases where a cylindrical case having a threaded portion on the outer periphery is fixed to a metal plate or the like.

  It is a top view of the nut for fixation of the sensor which shows the embodiment of the present invention.   It is a side view of the nut.   FIG. 3 is a partially omitted longitudinal sectional view of a sensor fixing structure showing an embodiment of the present invention.   It is a partially omitted plan view of the fixing structure.   It is a top view which shows another embodiment of the nut for fixation.   It is a side view of the nut.   Furthermore, it is a top view which shows another embodiment of the nut for fixing.   It is a side view of the nut.   It is conventional explanatory drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Displacement sensor 2 Fixing bolt 2A Fixing bolt 3 Lock screw 3a Hexagon socket 4 L wrench 10 Cylindrical case 10a Outer periphery screw part 20 Nut main body 20a Large diameter screw part 20c Small diameter screw part

Claims (3)

  A small-diameter screw hole for the lock screw penetrating in the axial direction is provided in at least one side of the large-diameter screw hole in the nut body having a large-diameter screw hole that is screwed to the outer peripheral screw of the cylindrical case in the sensor at the center. Nuts for fixing sensors.   A sensor fixing structure used when the sensor is attached to a metal plate or the like in an embedded shape, and has a large diameter screwed into the outer peripheral screw of the cylindrical case of the sensor at the center while the outer peripheral screw is provided in the cylindrical case of the sensor. A pair of fixing nuts having screw holes and having a small-diameter screw hole penetrating in the axial direction on at least one side of the large-diameter screw hole, and a lock screw screwed into each small-diameter screw hole. After inserting the cylindrical case into the through hole such as a metal plate and passing it through, the fixing nuts are screwed into both ends of the outer peripheral screw to sandwich the metal plate, etc., and the lock screw is inserted into each small diameter screw hole. A fixing structure of a sensor, wherein the fixing nut is locked so that it cannot be loosened by screwing together and pressing the tip part against a metal plate or the like.   3. The lock screw according to claim 2, wherein the outer periphery of the lock screw is covered with nylon or the like excellent in loosening prevention, and has a hexagonal hole portion into which an L wrench having a hexagonal cross section can be engaged. Sensor fixing structure.

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