A bearing seat capable of adjusting the concentricity of two bearing seats

Abstract

The present invention relates to the technical field of bearing seats, and specifically to a bearing seat capable of adjusting the concentricity of two bearing seats, comprising a base, on which a bearing seat outer ring is fixedly mounted, an adjustment block is provided on the bearing seat outer ring, and further comprising: a sliding chamber, wherein the sliding chamber is opened on the bearing seat outer ring, and a lifting sleeve is slidably mounted in the sliding chamber, and the lifting sleeve is connected to the adjustment block; and an adjustment mechanism, wherein the adjustment mechanism is connected to the bearing seat outer ring, the base and the lifting sleeve, wherein the adjustment mechanism comprises a lifting drive assembly, a thin steel wire and a monitoring assembly; the bearing seat capable of adjusting the concentricity of the two bearing seats of the present invention is simple to operate, provides convenience for the staff, and can avoid unqualified processing of batch workpieces due to untimely inspection, reduces the probability of loss, and can detect concentricity in real time to ensure that the equipment works efficiently and accurately.

Description

Technical Field

[0001] The invention relates to the technical field of bearing seats, in particular to a bearing seat capable of adjusting the concentricity of two bearing seats. Background Art

[0002] The bearing seat is a component installed on the machine body or foundation to support the bearing. The existing bearing seats are all integral. When assembling the integral bearing seat, the outer edge of the bearing is installed in the bearing seat hole, and the inner hole of the bearing is installed on the shaft. The bearing and the bearing seat are subjected to force at the same time. It is a device that can accept comprehensive loads and has a special structure. Therefore, it is now more and more widely used in life.

[0003] After searching, the current Chinese patent document CN213360872U discloses a bearing seat with adjustable concentricity of two bearing seats. The drive shaft is driven to rotate by rotating the disc, and the drive shaft drives the lifting rod to fine-tune up and down through the spiral pair, thereby driving the adjustment block to slide and adjust the concentricity of the bearing seat. However, during the use of the bearing seat, due to the matching connection relationship of each spiral pair, the adjustment block is likely to become loose, resulting in changes in concentricity. If looseness occurs during the workpiece processing, it is easy to cause batch workpiece processing to be unqualified, resulting in huge losses, and frequent concentricity testing not only brings trouble to the staff, but also requires downtime, affecting work efficiency. Therefore, in view of the above situation, there is an urgent need to develop a bearing seat with adjustable concentricity of two bearing seats to overcome the shortcomings in current practical applications. Summary of the Invention

[0004] The object of the present invention is to provide a bearing seat capable of adjusting the concentricity of two bearing seats, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A bearing seat capable of adjusting the concentricity of two bearing seats, comprising a base, on which an outer ring of the bearing seat is fixedly mounted, and an adjustment block is provided on the outer ring of the bearing seat, and further comprising:

[0007] a sliding chamber, the sliding chamber being opened on the outer ring of the bearing seat, and a lifting sleeve being slidably installed in the sliding chamber, the lifting sleeve being connected to the adjusting block; and

[0008] An adjustment mechanism connected to the bearing seat outer ring, the base and the lifting sleeve, wherein the adjustment mechanism includes a lifting drive assembly, a thin steel wire and a monitoring assembly;

[0009] The lifting drive assembly is respectively connected to the outer ring of the bearing seat and the base, and is connected to the lifting sleeve. The monitoring assembly is located on the outer ring of the bearing seat, and the monitoring assembly is also connected to the adjustment block through a thin steel wire.

[0010] As a further solution of the present invention: the lifting drive assembly includes:

[0011] An adjusting chamber, wherein the adjusting chamber is provided on the base and a rotating shaft is rotatably mounted in the adjusting chamber;

[0012] a threaded rod, one end of which is sleeved in the lifting sleeve and threadedly connected to the lifting sleeve, and the other end of which passes through the base and is connected to the rotating shaft through a transmission member;

[0013] a filter screen, the filter screen being detachably mounted in the adjustment chamber; and

[0014] A rotation adjustment unit is located in the adjustment chamber and connected to the rotation shaft.

[0015] As a further solution of the present invention: the rotation adjustment unit includes:

[0016] An internal thread groove, the internal thread groove being located in the adjustment chamber;

[0017] An externally threaded barrel, which is sleeved in the internally threaded groove and threadedly connected to the internally threaded groove, and a built-in rotating head is fixedly mounted on the end of the externally threaded barrel; and

[0018] A positioning slide, one end of which is fixedly connected to the rotating shaft, and the other end of which is sleeved in the external threaded barrel and slidably connected to the external threaded barrel through a limiting sliding member.

[0019] As a further solution of the present invention: further comprising: an inclined positioning groove, wherein the inclined positioning groove is formed on the top end of the positioning slide plate; and

[0020] An elastic damping rod, one end of which is fixedly connected to the inner wall of the externally threaded cylinder, and the other end of which is clamped in the inclined positioning groove and slidably connected to the inclined positioning groove.

[0021] As a further solution of the present invention: the monitoring component includes:

[0022] A monitoring box, the monitoring box is fixedly mounted on the outer ring of the bearing seat, and an indicator is fixedly mounted on the monitoring box;

[0023] A sliding rod, the sliding rod being slidably mounted in the monitoring box, and a detection ball being provided at one end of the sliding rod, the detection ball being electrically connected to the indicator, and the other end of the sliding rod being fixedly connected to the thin steel wire;

[0024] a second fixed pulley, the second fixed pulley being rotatably mounted in the monitoring box and being slidably connected to the thin steel wire; and

[0025] A tension unit is located in the monitoring box and is also connected to the sliding rod.

[0026] As a further solution of the present invention: the tension unit includes:

[0027] a baffle, the baffle being fixedly mounted in the monitoring box;

[0028] a push spring, wherein the push spring is sleeved on the sliding rod, one end of the push spring is fixedly connected to the baffle, and the other end of the push spring is fixedly connected to the sliding rod; and

[0029] A limit plate is fixedly mounted on the inner wall of the monitoring box, and the limit plate is detachably connected to the detection ball.

[0030] As a further solution of the present invention: further comprising: a guide accommodating cavity, the guide accommodating cavity being opened on the outer ring of the bearing seat and being in communication with the sliding cavity;

[0031] a guide tube, the guide tube being fixedly mounted on the outer ring of the bearing seat and communicating with the guide accommodating cavity, and the thin steel wire being sleeved inside the guide tube; and

[0032] A fixed pulley is rotatably mounted in the guide accommodating cavity and is slidably connected to the thin steel wire.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] During the use of the outer ring of the bearing seat, a bearing body and a rotating shaft are installed on the outer ring of the bearing seat. In order to ensure the concentricity of the shaft during rotation, first, a lifting drive assembly is set up, which can be driven by manpower, thereby driving the lifting sleeve to slide in the sliding chamber, and at the same time, the position of the adjusting block can be fine-tuned to achieve the adjustment of the concentricity of the outer ring of the bearing seat, and a monitoring assembly is set up, wherein the installation position of the monitoring assembly is close to the rotating shaft, and the monitoring assembly is also connected to the adjusting block by a thin steel wire. During the rotation of the shaft, when the lifting drive assembly fails and causes the adjusting block to loosen, or the concentricity of the outer ring of the bearing seat deviates, wherein, although the working mode of the adjusting block when it is loose is different from the working mode when the concentricity deviation of the outer ring of the bearing seat deviates, the shaft will come into contact with the monitoring assembly during the rotation process, thereby enabling the monitoring assembly to start working, so as to promptly remind the workers. When the adjusting block is loose, the thin steel wire will change from a taut state to a slightly relaxed state, so that the monitoring component can be further contacted with the rotating shaft under the action of thrust, thereby starting the monitoring component. When the concentricity of the outer ring of the bearing seat deviates, the rotating shaft will rotate in a slightly tilted state, thereby contacting the monitoring component and starting the monitoring component. Due to the difference in the two working modes, the starting time of the two sets of monitoring components can be different. When the adjusting block is loose, the two sets of monitoring components will contact the rotating shaft at the same time and start working. When the concentricity of the outer ring of the bearing seat deviates, the two sets of monitoring components will start one after another, which makes it easy for staff to quickly troubleshoot problems with the equipment. The operation is simple, provides convenience for staff, and can avoid unqualified processing of batch workpieces due to untimely troubleshooting, reduces the probability of loss, and can detect concentricity in real time to ensure efficient and accurate operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The figure is a schematic cross-sectional view of a bearing seat capable of adjusting the concentricity of two bearing seats in an embodiment of the present invention.

[0036] Figure 2 For the embodiment of the present invention Figure 1 Schematic diagram of the enlarged structure of part A.

[0037] Figure 3 This is a schematic diagram of the main structure of the outer ring part of the bearing seat in an embodiment of the present invention.

[0038] Figure 4 Schematic diagram of the cross-sectional structure of the monitoring box part in an embodiment of the present invention.

[0039] Figure 5 For the embodiment of the present invention Figure 1 Schematic diagram of the cross-sectional structure with part B enlarged.

[0040] Figure 6Schematic diagram of the cross-sectional structure of the positioning slide portion in an embodiment of the present invention.

[0041] In the figure: 1- outer ring of the bearing seat, 2- adjusting block, 3- base, 4- adjusting chamber, 5- guide accommodating chamber, 6- guide tube, 7- thin steel wire, 8- fixed pulley 1, 9- lifting sleeve, 10- sliding chamber, 11- threaded rod, 12- monitoring box, 13- indicator, 14- fixed pulley 2, 15- pushing spring, 16- baffle, 17- sliding rod, 18- limiting plate, 19- detection ball, 20- transmission part, 21- filter screen, 22- rotating shaft, 23- internal thread groove, 24- external thread barrel, 25- positioning slide, 26- built-in rotating head, 27- limiting sliding part, 28- tilted positioning groove, 29- elastic damping rod. DETAILED DESCRIPTION

[0042] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0044] See also Figures 1-6 An embodiment of the present invention provides a bearing seat capable of adjusting the concentricity of two bearing seats, comprising a base 3, a bearing seat outer ring 1 being fixedly mounted on the base 3, an adjustment block 2 being provided on the bearing seat outer ring 1, and further comprising:

[0045] A sliding chamber 10 is provided on the bearing seat outer ring 1 , and a lifting sleeve 9 is slidably installed in the sliding chamber 10 , and the lifting sleeve 9 is connected to the adjustment block 2 ; and

[0046] An adjustment mechanism connected to the bearing seat outer ring 1, the base 3 and the lifting sleeve 9, wherein the adjustment mechanism includes a lifting drive assembly, a thin steel wire 7 and a monitoring assembly;

[0047] The lifting drive assembly is respectively connected to the bearing seat outer ring 1 and the base 3, and is connected to the lifting sleeve 9. The monitoring assembly is located on the bearing seat outer ring 1, and the monitoring assembly is also connected to the adjustment block 2 through a thin steel wire 7.

[0048] During the use of the outer ring 1 of the bearing seat, a bearing body and a rotating shaft are installed on the outer ring 1 of the bearing seat. In order to ensure the concentricity of the shaft during rotation, first, a lifting drive assembly is provided, which can be driven by manpower, thereby driving the lifting sleeve 9 to slide in the sliding chamber 10, and at the same time, the position of the adjusting block 2 can be fine-tuned to achieve the adjustment of the concentricity of the outer ring 1 of the bearing seat, and a monitoring assembly is provided, wherein the installation position of the monitoring assembly is close to the rotating shaft, and the monitoring assembly is also connected to the adjusting block 2 by a thin steel wire 7. During the rotation of the shaft, when the lifting drive assembly fails and causes the adjusting block 2 to loosen, or when the concentricity of the outer ring 1 of the bearing seat deviates, wherein the working mode of the adjusting block 2 when it is loose is different from the working mode when the concentricity deviation of the outer ring 1 of the bearing seat occurs, the shaft will come into contact with the monitoring assembly during the rotation process, thereby enabling the monitoring assembly to start working, so as to promptly remind the worker When the adjusting block 2 is loose, the thin steel wire 7 will change from a taut state to a slightly relaxed state, so that the monitoring component can be further contacted with the rotating shaft under the action of thrust, thereby starting the monitoring component. When the concentricity of the outer ring 1 of the bearing seat deviates, the rotating shaft will rotate in a slightly tilted state, thereby contacting the monitoring component and starting the monitoring component. Due to the difference between the two working modes, the starting time of the two sets of monitoring components can be different. When the adjusting block 2 is loose, the two sets of monitoring components will contact the rotating shaft at the same time and start working. When the concentricity of the outer ring 1 of the bearing seat deviates, the two sets of monitoring components will start one after another, which can facilitate the staff to quickly check the problems of the equipment. The operation is simple, provides convenience for the staff, and can avoid the unqualified processing of batch workpieces due to untimely troubleshooting, reduces the probability of loss, and can detect concentricity in real time to ensure that the equipment works efficiently and accurately, which is worthy of promotion.

[0049] In one embodiment of the present invention, see Figure 1 、 Figure 2 、 Figure 5 and Figure 6 , the lifting drive assembly includes:

[0050] An adjusting chamber 4 is provided on the base 3 , and a rotating shaft 22 is rotatably mounted in the adjusting chamber 4 ;

[0051] a threaded rod 11, one end of which is sleeved in the lifting sleeve 9 and threadedly connected to the lifting sleeve 9, and the other end of which passes through the base 3 and is connected to the rotating shaft 22 via a transmission member 20;

[0052] A filter screen 21 detachably mounted in the regulating chamber 4 ; and

[0053] The rotation adjustment unit is located in the adjustment chamber 4 and connected to the rotation shaft 22 .

[0054] The rotation adjustment unit includes: an internal thread groove 23, and the internal thread groove 23 is located in the adjustment chamber 4;

[0055] An externally threaded barrel 24 , which is sleeved in the internally threaded groove 23 and threadedly connected to the internally threaded groove 23 , and a built-in rotating head 26 is fixedly mounted on the end of the externally threaded barrel 24 ; and

[0056] A positioning slide 25 , one end of which is fixedly connected to the rotating shaft 22 , and the other end of which is sleeved in the externally threaded barrel 24 and slidably connected to the externally threaded barrel 24 via a limiting sliding member 27 .

[0057] See also Figure 6 , further comprising: an inclined positioning groove 28, the inclined positioning groove 28 being opened on the top end of the positioning slide plate 25; and

[0058] An elastic damping rod 29 , one end of which is fixedly connected to the inner wall of the externally threaded barrel 24 , and the other end of which is clamped in the inclined positioning groove 28 and slidably connected to the inclined positioning groove 28 .

[0059] By setting a built-in rotating head 26, wherein the built-in rotating head 26 can be in the form of an inner hexagonal rotating head and is located in the adjustment chamber 4, misoperation can be avoided. When the built-in rotating head 26 is rotated manually, the external threaded barrel 24 can be driven to rotate, and under the action of the threaded fit between the external threaded barrel 24 and the internal threaded groove 23, the external threaded barrel 24 can be moved horizontally in the adjustment chamber 4. At the same time, by setting a limiting sliding member 27, wherein the limiting sliding member 27 can be in the form of a slide rail and a slide groove, during the movement of the external threaded barrel 24 , the external threaded barrel 24 can drive the positioning slide 25 to rotate synchronously, and drive the rotating shaft 22 to rotate as well. At this time, through the transmission member 20 provided, wherein the transmission member 20 can adopt a structure matched with bevel gears, so as to realize vertical transmission, so that the rotating shaft 22 drives the threaded rod 11 to rotate as well. Under the action of the threaded fit between the threaded rod 11 and the lifting sleeve 9, the lifting sleeve 9 can drive the adjusting block 2 to move as well, thereby realizing the adjustment of the position of the adjusting block 2. In addition, when the external threaded barrel 24 moves toward the inner direction of the adjusting chamber 4, the transmission member 20 is engaged. Under the transmission action of 20, the threaded rod 11 will drive the lifting sleeve 9 to move upward. At this time, the external threaded cylinder 24 will drive the limiting sliding member 27 to slide to the left in the elastic damping rod 29. Among them, the inner bottom wall of the inclined positioning groove 28 is an inclined structure with the left higher and the right lower. During the movement of the elastic damping rod 29, its elastic effect on the inner wall of the inclined positioning groove 28 is enhanced, so that as the reaction force exerted on the adjustment block 2 increases, the elastic force of the elastic damping rod 29 becomes stronger, and the positioning function becomes better. Among them, the inclined positioning groove 28 and the detection ball 1 9 can be connected by a damping sliding connection, or by sliding with opposite-name magnets, or in the form of an electromagnet, which will not be described in detail here, so that after the external threaded barrel 24 is rotated to an appropriate position, the concentricity adjustment is completed. At this time, under the action of magnetic attraction or damping force, the elastic damping rod 29 and the inner wall of the inclined positioning groove 28 are attracted to each other, so that the external threaded barrel 24 is in a braking state, which can prevent the external threaded barrel 24 from rotating during the operation of the equipment, so as to play a positioning role and ensure the normal operation of the equipment.

[0060] In one embodiment of the present invention, see Figures 1-4 , the monitoring component includes:

[0061] A monitoring box 12 is fixedly mounted on the bearing seat outer ring 1 and an indicator 13 is fixedly mounted on the monitoring box 12;

[0062] A sliding rod 17 is slidably mounted in the monitoring box 12, and a detection ball 19 is provided at one end of the sliding rod 17, the detection ball 19 is electrically connected to the indicator 13, and the other end of the sliding rod 17 is fixedly connected to the thin steel wire 7;

[0063] A second fixed pulley 14, which is rotatably mounted in the monitoring box 12 and is slidably connected to the thin steel wire 7; and

[0064] A tension unit is located in the monitoring box 12 and is also connected to the sliding rod 17 .

[0065] The tension unit includes: a baffle 16, which is fixedly installed in the monitoring box 12;

[0066] A push spring 15, wherein the push spring 15 is sleeved on the sliding rod 17, and one end of the push spring 15 is fixedly connected to the baffle 16, and the other end of the push spring 15 is fixedly connected to the sliding rod 17; and

[0067] The limiting plate 18 is fixedly mounted on the inner wall of the monitoring box 12 , and the limiting plate 18 and the detection ball 19 are detachably connected.

[0068] See also Figure 1 and Figure 2 , further comprising: a guide accommodating chamber 5, the guide accommodating chamber 5 being opened on the bearing seat outer ring 1, and the guide accommodating chamber 5 being communicated with the sliding chamber 10;

[0069] A guide tube 6, which is fixedly mounted on the bearing seat outer ring 1 and communicates with the guide accommodating cavity 5, and in which the thin steel wire 7 is sleeved; and

[0070] A fixed pulley 8 is rotatably mounted in the guide accommodating cavity 5 and is slidably connected to the thin steel wire 7.

[0071] During shaft rotation, the detection ball 19 is close to the shaft, and the thin steel wire 7 is in a taut state, while the push spring 15 is in a compressed state. When the adjustment block 2 becomes loose, the push force of the push spring 15 causes the sliding rod 17 and the detection ball 19 to move to the right, thereby contacting the shaft. At this time, the detection ball 19 activates the indicator 13. The detection ball 19 can be in the form of a built-in sensor to detect whether the outside of the detection ball 19 is in contact with the shaft. Under the control of the sensor, the indicator 13 can be activated. The indicator 13 can be in the form of a flashing light or a buzzer to alert the staff. The guide tube 6, fixed pulley 1 8, and fixed pulley 2 14 can ensure that the thin steel wire 7 slides in the specified direction. When the concentricity of the bearing seat outer ring 1 deviates, the detection ball 19 will not move, and the shaft will rotate in a slightly tilted state, thereby contacting the two detection balls 19 in turn, causing the two indicators 13 to start working in turn, providing a reference for the staff's troubleshooting work.

[0072] It should be noted that, in the present invention, unless otherwise expressly specified or limited, the terms "sliding," "rotating," "fixed," and "provided with," etc., should be understood in a broad sense. For example, they may refer to welded connections, bolted connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise expressly specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0073] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A bearing seat capable of adjusting the concentricity of two bearing seats, comprising a base, on which an outer ring of the bearing seat is fixedly mounted, and an adjustment block is provided on the outer ring of the bearing seat, characterized in that: Also includes: A sliding chamber, the sliding chamber being opened on the outer ring of the bearing seat, and a lifting sleeve being slidably installed in the sliding chamber, the lifting sleeve being connected to the adjusting block; as well as An adjustment mechanism connected to the bearing seat outer ring, the base and the lifting sleeve, wherein the adjustment mechanism includes a lifting drive assembly, a thin steel wire and a monitoring assembly; The lifting drive assembly is respectively connected to the outer ring of the bearing seat and the base, and is connected to the lifting sleeve. The monitoring assembly is located on the outer ring of the bearing seat, and the monitoring assembly is also connected to the adjustment block through a thin steel wire. The monitoring assembly includes: a monitoring box, the monitoring box is fixedly mounted on the outer ring of the bearing seat, and an indicator is fixedly mounted on the monitoring box; A sliding rod, the sliding rod being slidably mounted in the monitoring box, and a detection ball being provided at one end of the sliding rod, the detection ball being electrically connected to the indicator, and the other end of the sliding rod being fixedly connected to the thin steel wire; a second fixed pulley, the second fixed pulley being rotatably mounted in the monitoring box and being slidably connected to the thin steel wire; and A tension unit, the tension unit being located in the monitoring box and further connected to the sliding rod; The tension unit includes: a baffle, which is fixedly installed in the monitoring box; a push spring, wherein the push spring is sleeved on the sliding rod, one end of the push spring is fixedly connected to the baffle, and the other end of the push spring is fixedly connected to the sliding rod; and A limit plate is fixedly mounted on the inner wall of the monitoring box, and the limit plate is detachably connected to the detection ball.

2. The bearing seat capable of adjusting the concentricity of two bearing seats according to claim 1, characterized in that: The lifting drive assembly includes: An adjusting chamber, wherein the adjusting chamber is provided on the base and a rotating shaft is rotatably mounted in the adjusting chamber; a threaded rod, one end of which is sleeved in the lifting sleeve and threadedly connected to the lifting sleeve, and the other end of which passes through the base and is connected to the rotating shaft through a transmission member; a filter screen, the filter screen being detachably mounted in the adjustment chamber; and A rotation adjustment unit is located in the adjustment chamber and connected to the rotation shaft.

3. The bearing seat capable of adjusting the concentricity of two bearing seats according to claim 2, characterized in that: The rotation adjustment unit includes: An internal thread groove, the internal thread groove being located in the adjustment chamber; An externally threaded barrel, which is sleeved in the internally threaded groove and threadedly connected to the internally threaded groove, and a built-in rotating head is fixedly mounted on the end of the externally threaded barrel; and A positioning slide, one end of which is fixedly connected to the rotating shaft, and the other end of which is sleeved in the external threaded barrel and slidably connected to the external threaded barrel through a limiting sliding member.

4. The bearing seat capable of adjusting the concentricity of two bearing seats according to claim 3, characterized in that: Also includes: An inclined positioning groove is provided on the top end of the positioning slide plate; as well as An elastic damping rod, one end of which is fixedly connected to the inner wall of the externally threaded cylinder, and the other end of which is clamped in the inclined positioning groove and slidably connected to the inclined positioning groove.

5. The bearing seat capable of adjusting the concentricity of two bearing seats according to claim 1, characterized in that: It also includes: a guide accommodating cavity, the guide accommodating cavity is opened on the outer ring of the bearing seat, and the guide accommodating cavity is connected to the sliding cavity; a guide tube, the guide tube being fixedly mounted on the outer ring of the bearing seat and communicating with the guide accommodating cavity, and the thin steel wire being sleeved inside the guide tube; and A fixed pulley is rotatably mounted in the guide accommodating cavity and is slidably connected to the thin steel wire.

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