CN201060278Y - adjustable sensor - Google Patents

Abstract

The utility model relates to a sensor with adjustable detection angle, including a mounting bracket and a sensing ball. The mounting bracket is provided with a spherical arc surface matched with the sensing ball; the sensing ball is rotatably and rotationally connected to the mounting bracket through a rotating connection assembly. The sensing ball is mounted on the spherical arc surface of the mounting bracket through the rotating connection assembly, so the sensing ball can be rotated and rotated left and right, up and down relative to the mounting bracket with the cooperation of the rotating connection assembly, and can also be installed on the inner and outer corners of the wall using a corner seat, which has the advantages of convenient adjustment and applicability to various occasions. By installing multiple LEDs on the detection probe assembly, the control circuit controls simultaneous flashing, cyclic lighting, flashing speed, etc., and the state of the LED can be observed through the lens to obtain the corresponding state of the detection probe assembly, which plays a warning and reminder role. The detection angle range of the detection probe can also be adjusted by installing a baffle on the outside of the lens to cover part of the lens.

Description

adjustable sensor

technical field

The utility model relates to a sensor, in particular to a sensor with an adjustable detection angle for warning.

Background technique

In indoor and outdoor automatic lighting systems or automatic monitoring systems such as buildings and residences, various types of sensors are usually used, such as brightness sensors, infrared sensors, sound sensors, ultrasonic sensors, etc. By detecting whether there is a human body or object moving, to control whether the lighting is on or whether other devices are working. Taking the infrared sensor as an example, it usually includes a mounting bracket and an infrared detection probe. The infrared detection probe is installed on the installation bracket through the connection shell, and then the entire infrared sensor is installed on the appropriate occasion through the installation bracket, such as the staircase wall, outdoor wall, etc. Further, a control circuit can be installed in the installation bracket, when the infrared detection probe detects the presence of people, animals or objects, etc., the output signal is sent to the control circuit, and the control circuit controls the lighting of the lighting or the action of other devices; When the infrared detection probe does not detect the presence of people, animals or objects within a predetermined period of time, turn off the lighting or other devices to stop the action.

In the prior art, the above-mentioned infrared detection probe usually uses a lens to focus the signal, and the detection angle is the angle of the lens or the detection angle of the detection probe itself; and the infrared detection probe is usually fixedly connected to the mounting bracket, so that the infrared The detection angle of the detection probe is fixed relative to the mounting bracket, which is not convenient for installation on some occasions (such as corners, ceilings, under eaves, etc.); and, when the detection angle needs to be adjusted, it is often necessary to replace the lens or reinstall the detection probe To adjust the angle between it and the mounting bracket, it brings great inconvenience to the user.

Utility model content

The technical problem to be solved by the utility model is to provide an adjustable sensor which is convenient for the user to adjust the detection angle, aiming at the defect that the detection angle of the sensor in the prior art is difficult to adjust.

The technical scheme adopted by the utility model to solve the technical problem is: to construct an adjustable inductor, including a mounting bracket and a sensing ball, and a spherical arc surface matched with the sensing ball is provided on the mounting bracket; The ball is rotatably and rotatably connected to the mounting bracket through a rotating connection assembly.

In the adjustable sensor of the present utility model, the induction ball includes an induction ball body connected to the mounting bracket through the rotating connection assembly, a spherical lens mounted on the induction ball body through a buckle structure, and The detection probe assembly installed in the induction ball body; the diameter of the lens is smaller than the diameter of the induction ball body.

In the adjustable sensor of the present utility model, the buckle structure includes a hook formed outwardly on the periphery of the lens, and a correspondingly formed inside of the induction ball body to cooperate with the hook. groove.

In the adjustable sensor of the present utility model, the side of the sensing ball body close to the mounting bracket is provided with a recess;

The rotating connection assembly includes an adapter rod, an arc-shaped adapter rod gland mounted on the outside of the recess, and a rotating disk rotatably installed on the inside of the mounting bracket;

The transfer rod is pressed between the induction ball body and the arc-shaped transfer rod cover, and includes a rod-shaped body, and horizontal hook guide rails and longitudinal clips are respectively provided at both ends of the rod-shaped body. hook;

The arc-shaped adapter rod cover is provided with a transverse guide groove parallel to the transverse hook guide rail, the transfer rod passes through the transverse guide groove, and the transverse hook guide rail is hooked on the transverse guide rail. the inner side of the guide groove;

The rotating disk is provided with a card edge that is clamped on the edge of the spherical arc surface, and the rotating disk is provided with a longitudinal guide groove for longitudinally guiding the transfer rod, and the longitudinal hook of the transfer rod passes through Out of the longitudinal guide groove, the hook is arranged on the outside of the longitudinal guide groove;

The longitudinal guide groove and the transverse guide groove form an included angle of 90 degrees.

In the adjustable sensor of the present invention, the mounting bracket includes a bottom cover, an inner cover installed on the bottom cover, and a decorative cover installed outside the inner cover; the spherical arc surface is set on the inner cover , and the sensing ball is connected to the inner cover; a control circuit electrically connected to the detection probe assembly is mounted on the bottom cover.

In the adjustable sensor of the present utility model, the detection probe assembly is a passive infrared detection probe assembly, which includes a circuit board installed in the induction ball body, and an infrared detection probe installed on the circuit board; The infrared detection probe is located at the focus position of the lens; the circuit board is electrically connected with the control circuit through an electronic wire.

In the adjustable sensor of the present invention, a through hole is opened in the middle of the transfer rod, and the electronic wire passes through the through hole of the transfer rod to connect the circuit board and the control circuit.

In the adjustable sensor of the present utility model, the detection probe assembly also includes four light-emitting diodes that are controlled by the control circuit to work in a manner of simultaneously flashing or cyclically lighting up, and the light-emitting diodes are installed on the sensor The side of the ball body away from the decorative cover.

In the adjustable sensor of the present invention, the outer side of the sensing ball is provided with a blocking plate for adjusting the detection range.

In the adjustable sensor of the present utility model, the baffle is a spherical shape matched with the lens; there is a hook on the edge of the baffle, and a hook corresponding to the hook is provided on the outer wall of the edge of the lens. A matching slot, and the position of the induction ball body relative to the slot extends out of a pressing edge, and the blocking plate can be rotatably installed on the outside of the lens. .

Implementing the adjustable sensor of the utility model has the following beneficial effects: the induction ball is installed on the spherical arc surface of the mounting bracket through the rotating connection assembly, so the induction ball can be rotated with the cooperation of the rotating connection assembly, and relative to the installation The left and right, up and down rotation of the bracket has the advantages of convenient adjustment and being applicable to various occasions.

By installing multiple LEDs on the detection probe assembly, the control circuit controls simultaneous flashing, cyclic lighting, flashing speed, etc., and the state of the LEDs can be observed through the lens, so as to obtain the corresponding state of the detection probe assembly and serve as a warning function of reminder.

It is also possible to install a baffle on the outside of the lens to block part of the lens, thereby limiting the detection angle of the detection probe and reducing misoperation.

Description of drawings

The utility model will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is the front schematic view of the utility model adjustable inductor embodiment;

Fig. 2 is a partial sectional schematic diagram according to the section line A-A in Fig. 1;

Fig. 3 is a partially enlarged schematic diagram of part A in Fig. 2;

Fig. 4 is a schematic diagram of the sensor ball body and the adapter rod of the adjustable sensor of the present invention;

Fig. 5 is a schematic diagram of the combination of the induction ball body, the adapter rod and the adapter rod gland of the adjustable sensor of the present invention;

Fig. 6 is a schematic diagram when the transfer rod in Fig. 5 moves to an extreme position;

Fig. 7 is a schematic diagram of the combination of the inner cover, the rotating disk, the connecting rod and the induction ball body of the adjustable sensor of the present invention;

Fig. 8 is a schematic diagram when the rotating disk and the transfer rod in Fig. 7 are moved to a limit position;

Fig. 9 is a schematic diagram of the corner seat of the adjustable sensor of the present invention.

Detailed ways

As shown in FIGS. 1 to 8 , in an embodiment of the adjustable sensor of the present invention, the sensor includes a mounting bracket 10 and a sensing ball 30 . A spherical arc surface is provided on the mounting bracket 10, and the induction ball 30 is installed on the spherical arc surface through a rotating connection assembly. With the cooperation of the rotating connection assembly, the sensing ball 30 can realize rotation and turn left, right, and up and down relative to the mounting bracket 10 , which will be described in detail later.

As shown in FIG. 2 , the mounting bracket 10 includes a bottom cover 11 , an inner cover 12 installed on the bottom cover 11 , and a decorative cover 13 installed outside the inner cover 12 . The bottom cover 11 , the inner cover 12 and the decorative cover 13 are combined (or in other ways) to form the entire installation bracket 10 , and the entire sensor is installed in an appropriate position, such as a ceiling, a wall, a corner, and the like. In order to facilitate the installation of the mounting bracket 10 at a corner position, a corner seat 50 may be added to cooperate with the installation. As shown in Figure 9, it is a schematic diagram of the corner seat. Firstly, install the corner seat 50 at an appropriate position in the corner, and then use screws to install the bottom cover 11 of the mounting bracket 10 on the corner seat 50, so that the entire sensor The device is installed on the corner of the wall.

In order to cooperate with the induction ball 30, a spherical arc surface is provided on the inner cover 12, and the induction ball 30 is installed outside the spherical arc surface through a rotating connection assembly, and the induction ball 30 can rotate on the spherical arc surface, which will be described in detail later.

Further, a control circuit 14 can be installed on the bottom cover 11 for controlling lighting lamps or other devices according to the signal from the sensor ball 30 . The control circuit 14 is connected with the induction ball 30 through electronic wires.

As shown in FIG. 2 , the sensing ball 30 includes a sensing ball body 31 , a spherical lens 32 and a probe assembly 33 . The induction ball body 31 is connected to the spherical arc surface of the inner cover 12 through a rotating connection assembly, so that the induction ball body 31 can realize rotation, left and right, and up and down rotation relative to the bracket, which will be described in detail later. The lens 32 is also a hemisphere, which is used to focus external infrared signals. The lens 32 is mounted on the opening side of the sensing ball body 31 through the structure of the hook 321 , so that the lens 32 and the sensing ball body 31 form a complete sphere.

As shown in FIG. 3 , the structure of the hook 321 includes a hook 321 formed on the periphery of the lens 32 outward, and a corresponding groove 311 formed on the inner side of the sensor ball body 31 to cooperate with the hook 321 . And the diameter of the lens 32 is smaller than the diameter of the sensing ball body 31 . When installing the lens 32, first tighten the lens 32 slightly, push the hook 321 of the lens 32 into the slot 311 of the induction ball body 31; then, loosen the lens 32, under the action of the elastic recovery of the lens 32 , the hook 321 resets, and is locked in the slot 311 , so that the lens 32 is fastened to the sensor ball body 31 .

In this embodiment, the detection probe assembly 33 is a passive infrared detection probe 332 assembly 33 , which includes a circuit board 331 installed in the sensing ball body 31 , and an infrared detection probe 332 installed on the circuit board 331 . Wherein, the infrared detection probe 332 is located at the focal point of the lens 32 , so that the external infrared signal is transmitted to the infrared detection probe 332 after being focused by the lens 32 . Moreover, the circuit board 331 is connected to the control circuit 14 on the bottom cover 11 through electronic wires, and transmits the signal detected by the infrared detection probe 332 to the control circuit 14, and the control circuit 14 controls the lighting lamp or other devices.

Further, since the detection angle of the infrared detection probe 332 is relatively large, and the lens 32 is a spherical lens 32, its focusing angle is also relatively large, so in some applicable occasions, especially the user only needs to detect a certain angle and needs to ignore other In the case of a different angle, unnecessary false alarms will be caused. Therefore, in this embodiment, a baffle 34 is arranged on the outside of the lens 32 to block external signals so that the external signals cannot enter the lens 32, thereby The detection angle is reduced, effectively avoiding false alarms.

As shown in FIG. 2 and FIG. 3 , the blocking piece 34 has a spherical shape, matching with the shape of the lens 32 . A hook 341 is formed on the edge of the blocking piece 34. Correspondingly, a slot 322 matching the hook 341 is provided on the outer wall of the edge of the lens 32, and the position of the sensing ball body 31 relative to the slot 322 extends out of the pressing edge. 312. When assembling, insert the edge of the blocking plate 34 into the gap between the lens 32 and the pressing edge 312, so that the hook 341 snaps into the slot 322, so that under the pressure of the pressing edge 312, the blocking plate 34 is compressed and fixed on the outside of the lens 32, and blocks part of the lens 32, thereby adjusting the detection range. According to the size of the detection range, one piece, multiple pieces or no blocking plate 34 can be selected to adjust the detection range, so that the use occasions of the whole sensor are more extensive and humanized. Moreover, the size of the blocking piece 34 can be cut according to needs.

As shown in FIGS. 2 to 8 , the induction ball 30 is adjustablely mounted on the mounting bracket 10 through a rotating connection assembly, wherein the rotating connection assembly includes an adapter rod 51 , an arc-shaped adapter rod cover 52 and a rotating disk 53 .

The adapter rod 51 includes a rod-shaped main body 511, and the two ends of the rod-shaped main body 511 are respectively provided with a transverse hook guide rail 512 and a longitudinal hook 513, and the transverse hook guide rail 512 and the longitudinal hook 513 form an angle of 90 degrees. . In order to install the adapter rod 51, a recessed portion 313 is provided on the side of the induction ball body 31 close to the mounting bracket 10, and the arc-shaped transfer rod gland 52 is installed on the outside of the recessed portion 313 by screws or other connection methods, and the induction ball The concave portion 313 of the body 31 is rounded. Further, a transverse guide groove 521 parallel to the transverse hook guide rail 512 is opened on the arc-shaped transfer rod cover 52, the transfer rod 51 passes through the transverse guide groove 521, and the transverse hook guide rail 512 is hooked on the transverse guide rail 512. The inner side of the slot 521 limits the transverse hook guide rail 512 of the transfer rod 51 between the arc-shaped transfer rod cover 52 and the concave portion 313 of the induction ball body 31 .

In order to facilitate the routing of the electronic wires connecting the probe head assembly and the control circuit 14 on the mounting bracket 10, a routing via hole is provided on the recessed part 313, and a sealing rubber ring is installed on the routing via hole; The rod 51 is designed as a hollow structure, so that the electronic wire can pass through the routing hole and the hollow transfer rod 51 to connect the probe head assembly and the control circuit 14 .

The rotating disk 53 is arranged inside the inner cover 12, and the rotating disk 53 is provided with a card edge 531, and the card edge 531 is fixed on the edge of the spherical arc surface of the inner cover 12, so that the rotating disk 53 cannot pass through the spherical arc surface. The rotating disk 53 is provided with a longitudinal guide groove 532 for the longitudinal guide of the adapter rod 51, and the longitudinal guide groove 532 forms an included angle of 90 degrees with the transverse guide groove 521, so that the transfer rod 51 can be rotated between two angles of 90 degrees. Rotate in one direction, and drive the induction ball 30 to rotate in these two directions. In order to facilitate the contraction of the longitudinal hook 513 through the longitudinal guide groove 532, a "U"-shaped groove is provided on the main body 511 of the adapter rod 51, so as to facilitate the inward contraction of the longitudinal hook 513, and elastic recovery after passing through the longitudinal guide groove 532, The longitudinal hook 513 is locked on the outside of the longitudinal guide groove 532 , thereby connecting the induction ball 30 to the rotating disk 53 , and since the rotating disk 53 can rotate, the induction ball 30 can also rotate following the rotating disk 53 . The side of the rotating disc 53 close to the sensing ball body 31 is a spherical surface, which cooperates with the sensing ball body 31 so that the sensing ball body 31 can rotate.

Further, in order to limit the rotation angle of the sensing ball 30 , a rotating disc stop point 533 is provided on the edge of the rotating disc 53 , and two inner cover stops 122 are provided corresponding to the inner wall of the inner cover 12 at a certain distance. When the rotating disk 53 rotates, the rotating disk blocking point 533 moves between the two inner cover gear positions 122 , so that the induction ball 30 can only rotate between the two inner cover gear positions 122 .

When assembling, first install the control circuit 14 on the bottom cover 11; put the rotating disk 53 from the inner side of the inner cover 12, and the card edge 531 of the rotating disk 53 is stuck on the edge of the spherical arc surface of the inner cover 12 to prevent the rotating disk 53 Take off the inner cover 12.

Then, the induction ball 30 is installed. First, the probe assembly 33 is fixedly installed in the sensor ball body 31, then, tighten the lens 32 slightly, push the hook 321 of the lens 32 into the slot 311 of the sensor ball body 31, and then release the lens 32, Under the action of the elastic recovery of the lens 32, the hook 321 resets and is clamped in the slot 311, so that the lens 32 is fastened to the sensor ball body 31; then, it is determined whether to install the stopper 34 according to the angle to be detected. , or install one or more blocking plates 34. When installing the blocking piece 34, rotate and slide the edge of the blocking piece 34 into the gap between the lens 32 and the pressing edge 312, so that the hook 341 snaps into the slot 322, so that under the pressure of the pressing edge 312 , the blocking plate 34 is compressed and fixed on the outside of the lens 32 .

Then, install the connection assembly on the side of the sensing ball 30 away from the lens 32 . First, pass the adapter rod 51 through the arc-shaped adapter rod gland 52, and make the transverse hook guide rail 512 hooked inside the transverse guide groove 521 of the arc-shaped adapter rod gland 52; The arc-shaped adapter rod gland 52 is fixed on the outside of the concave portion 313 of the induction ball body 31 , and connects the adapter rod 51 to the induction ball body 31 .

Then, the longitudinal hook 513 of the adapter rod 51 is pressed into the longitudinal guide groove 532 passing through the rotating disk 53, and the longitudinal engaging hook 513 is hooked on the outside of the longitudinal guiding groove 532, thereby connecting the induction ball 30 to the rotating disk 53 on.

Then, cover the outside of the inner cover 12 with the decorative cover 13 to form a complete sensor. Certainly, the probe assembly and the control circuit 14 on the inner cover 12 are conductively connected through electronic wires, and the electronic wires can be routed through the hollow adapter rod 51 for easy connection; of course, the wires can also be routed through other positions.

When installing the entire sensor on site, first remove the decorative cover 13, use screws or the like to directly pass through the bottom cover 11, and fix it at an appropriate position on the wall, or install it at a corner position through an adapter corner piece.

When it is necessary to turn the induction ball 30 left and right, hold the induction ball 30 and apply a force in the left or right direction, and the induction ball 30 will move in the left and right directions under the action of the guide of the adapter rod 51 by the transverse guide groove 521 , the left and right rotation of the sensor ball 30 is realized, and the rotation angle is determined by the length of the transverse guide groove 521 . As shown in FIG. 5 , the transfer rod 51 moves to a limit position. In order to facilitate the positioning, the transverse guide groove 521 and the connecting rod 51 are too tightly fitted.

When it is necessary to turn the induction ball 30 up and down, hold the induction ball 30 and apply an upward or downward force, and under the action of the longitudinal guide groove 532 as the guide of the adapter rod 51, the induction ball 30 can move upwards and downwards. , the up and down rotation of the sensing ball 30 is realized, and the rotation angle is determined by the length of the longitudinal guide groove 532 . As shown in FIG. 8, the transfer rod 51 moves to a limit position. In order to facilitate positioning, the longitudinal guide groove 532 and the adapter rod 51 are also tightly fitted.

When the induction ball 30 needs to be rotated, hold the induction ball 30 and apply a rotational force, since the transfer rod 51 is stuck in the longitudinal guide groove 532 of the rotating disc 53, the transfer rod 51 cannot rotate, thereby forcing the rotating disc 53 to rotate , so that the entire induction ball 30 and the rotating disk 53 rotate simultaneously, realizing the adjustment of the rotation of the induction ball 30 . In addition, the rotation angle of the sensing ball 30 is limited through the cooperation between the rotating disc stop point 533 of the rotating disc 53 and the inner cover stop position 122 of the inner cover 12 , thereby realizing the limit function. As shown in FIG. 8, the rotating disk 53 moves to a limit position. In addition, under the force of the longitudinal hook 513 of the connecting rod 51 tightening the rotating disk 53 , the rotating disk 53 can be positioned at a certain position without external force, thereby positioning the sensing ball 30 .

In addition, in this embodiment, four light-emitting diodes are installed on the circuit board 331 of the probe assembly 33 installed in the sensor ball body 31, and the light-emitting diodes are installed on the side away from the decorative cover 13, that is, the sensor The front side to be detected, so that people can easily observe it. The four light-emitting diodes are respectively connected to the control circuit 14, receive signals from the control circuit 14, and light up or flash at the same time to indicate the working mode of the detection probe of the sensor, wherein, in the OFF mode, Except for the test mode, the load and the four LEDs of the sensor will not light up no matter whether a moving signal is detected or not; in the WARNING mode, except for the test mode, the load will not light up when no moving signal is detected , while the four light-emitting diodes flash at the same time; in the WATCH mode, except for the test mode, when no moving signal is detected, the load does not light up, and the four light-emitting diodes flash in turn. Because in the prior art, the above-mentioned control circuit 14 is usually made of MCU, so the control circuit 14 only needs to reserve the same input/output terminals as the number of light-emitting diodes to be connected to the above-mentioned light-emitting diodes, and make corresponding changes in the program, so that The output signal of the input/output end only needs to correspond to the above-mentioned working mode, and details will not be repeated here.

Claims (10)

1. an adjustable inductor comprises mounting bracket and induction sphere, it is characterized in that, offers the spherical arc that cooperates with described induction sphere on the described mounting bracket; Described induction sphere is connected with described mounting bracket rotationally by rotatable the reaching of the assembly that is rotationally connected.

2. adjustable inductor according to claim 1, it is characterized in that described induction sphere comprises by the described assembly that is rotationally connected and is connected to induction sphere body on the described mounting bracket, is installed in the spherical eyeglass on the described induction sphere body and is installed in the intrinsic detection probe assembly of described induction sphere by buckle structure; The diameter of described eyeglass is less than the diameter of described induction sphere body.

3. adjustable inductor according to claim 2 is characterized in that, described buckle structure is included in the outside grab that forms of periphery of described eyeglass, and the corresponding draw-in groove that matches with described grab in the formation of the inboard of described induction sphere body.

4. according to claim 2 or 3 described adjustable inductors, it is characterized in that described induction sphere body is provided with depressed part near a side of described mounting bracket;

The described assembly that is rotationally connected comprises adapting rod, is installed in the arc adapting rod gland and the rotatable rolling disc that is installed in described mounting bracket inboard in the described depressed part outside;

Described adapting rod is compressed between described induction sphere body and the described arc adapting rod gland, comprises shaft-like main body, is respectively equipped with horizontal grab guide rail and vertical grab at the two ends of described shape body;

Described arc adapting rod gland offers and the parallel horizontal guide groove of described horizontal grab guide rail, and described adapting rod passes described horizontal guide groove, and described horizontal grab guide rail hook is located at the inboard of described horizontal guide groove;

Described rolling disc is provided with the edge clipping at the edge that is fastened on described spherical arc, and described rolling disc is provided with the vertical guide groove into described adapting rod longitudinally guiding, and vertical grab of described adapting rod passes described vertical guide groove, and hook is located at the outside of described vertical guide groove;

Described vertical guide groove and described horizontal guide groove form the angle of 90 degree.

5. adjustable inductor according to claim 4 is characterized in that, the decorative cover that described mounting bracket comprises bottom, is installed in the inner cap on the bottom and is installed in the inner cap outside; Described spherical arc is opened in and covers in described, and described induction sphere is connected and covers in described; The control circuit that is electrically connected with described detection probe assembly is installed on the described bottom.

6. adjustable inductor according to claim 5 is characterized in that, described detection probe assembly is the passive infrared detection probe assembly, and it comprises and is installed in the intrinsic circuit board of described induction sphere, is installed in the infrared acquisition probe on the described circuit board; Described infrared acquisition probe is positioned at the focal position of eyeglass; Described circuit board is electrically connected with described control circuit by the electronics line.

7. adjustable inductor according to claim 6 is characterized in that the centre of described adapting rod offers through hole, and the lead to the hole site that described electronics line passes described adapting rod connects described circuit board and control circuit.

8. adjustable inductor according to claim 7, it is characterized in that, described detection probe assembly comprises that also four are controlled light emitting diode with flicker simultaneously or the circulation mode work of lighting by described control circuit, and described light emitting diode is installed in the side of described induction sphere body away from described decorative cover.

9. adjustable inductor according to claim 4 is characterized in that the outside of described induction sphere is provided with the catch that is used to adjust investigative range.

10. adjustable inductor according to claim 9 is characterized in that, described catch is the spherical shape that cooperates with described eyeglass; There is grab at the edge of described catch, outer wall at described lens edge offers the draw-in groove that matches with described grab, and described induction sphere body extends with respect to the position of described draw-in groove and compresses the edge, and described catch can rotaryly be installed in the described eyeglass outside.

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