CN113599072A

CN113599072A - Medical protective glasses convenient to dismantle

Info

Publication number: CN113599072A
Application number: CN202111168874.4A
Authority: CN
Inventors: 徐巧鸿
Original assignee: Nantong Jiagu Labor Protection Products Co ltd
Current assignee: Nantong Jiagu Labor Protection Products Co ltd
Priority date: 2021-10-08
Filing date: 2021-10-08
Publication date: 2021-11-05
Anticipated expiration: 2041-10-08
Also published as: CN113599072B

Abstract

The invention discloses medical protective glasses convenient to disassemble, which comprise an eye protection frame, wherein an elastic wearing belt is arranged on one side of the eye protection frame, an eye protection lens is arranged in the inner part of one port of the eye protection frame, an elastic gasket is covered on the upper end face of the eye protection frame, an adjusting mechanism is arranged on the outer surface of the eye protection frame, a disassembling and assembling structure is arranged on the inner wall of the eye protection frame, and the adjusting mechanism comprises an adjusting shell, an adjusting sliding frame, a male magic tape, a winding roller, a female magic tape and an adjusting screw rod. The medical protective glasses convenient to disassemble, disclosed by the invention, belong to the field of glasses, can adjust the length of the elastic wearing band in a small range, meet the requirement that the degree of tightness can be adjusted according to the requirement when different users wear goggles, effectively improve the wearing comfort of the users, and after the elastic wearing band loses elasticity, the elastic wearing band can be disassembled, assembled and replaced, so that the service life of the goggles is effectively prolonged.

Description

Medical protective glasses convenient to dismantle

Technical Field

The invention relates to the field of eyes, in particular to medical protective glasses convenient to disassemble.

Background

The safety glasses are important components in individual protective equipment, and can be divided into common safety glasses and special safety glasses according to use functions, the safety glasses are special glasses and are designed for preventing light damage of radioactivity, chemistry, mechanicalness and different wavelengths, the types of the safety glasses are many, the glasses with different requirements in different occasions are different, the common glasses specifically comprise a plurality of types such as dustproof glasses, impact-resistant glasses, chemical-resistant glasses and light-radiation-resistant glasses, the safety glasses are the safety glasses commonly used in the medical environment, and the safety glasses can prevent the radiation light from damaging the eyes by changing the light intensity and the light spectrum; however, the glasses frame and the lenses of the existing medical protective glasses are fixed and assembled through glue or self occlusal force, the lenses are not convenient to replace after being damaged, and the length of the elastic wearing belt worn on the glasses frame is not convenient for fine adjustment, so that the comfort level of a user is not good when the user wears the elastic wearing belt.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide medical protective glasses convenient to disassemble, which can effectively solve the problems that the glasses frame and the lenses of the existing medical protective glasses in the background technology are fixedly assembled through glue or the self-biting force, the lenses are inconvenient to replace after being damaged, and the length of an elastic wearing belt worn on the glasses frame is inconvenient to finely adjust, so that the comfort level of a user is poor when the user wears the glasses, the technical scheme can adjust the length of the elastic wearing belt in a small range, meets the requirement that the tightness degree is adjusted according to the requirements when different users wear the glasses, effectively improves the comfort level when the user wears the glasses, can disassemble and replace the elastic wearing belt after the elasticity of the elastic wearing belt is failed, effectively improves the service life of the glasses, and flexibly assembles the protective glasses and the protective glasses frame by using the protective glasses after the surface of the protective glasses is worn or damaged, the safety goggles are beneficial to follow-up disassembly and replacement, limited resources are recycled, the cost of directly discarding the safety goggles due to the damage of accessories is reduced, and the risk that the elastic washer falls off from the safety goggles frame can be reduced due to the double embedding of the elastic washer in the use process.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A medical protective glasses convenient to disassemble comprises a protective glasses frame, wherein an elastic wearing belt is arranged on one side of the protective glasses frame, a protective glass is arranged inside one port of the protective glasses frame, an elastic washer is arranged on an upper end face cover of the protective glasses frame, an adjusting mechanism is arranged on the outer surface of the protective glasses frame, a disassembling and assembling structure is arranged on the inner wall of the protective glasses frame, the adjusting mechanism comprises an adjusting shell, an adjusting carriage, a magic male sticker, a rolling rotating roller, a magic female sticker and an adjusting screw rod, the surface of the adjusting shell is movably provided with the adjusting screw rod, the outer surface of the adjusting screw rod is sleeved with the rolling rotating roller, the magic female sticker is sleeved on the surface of the rolling rotating roller, the adjusting carriage is sleeved on the surface of the elastic wearing belt, the magic male sticker is fixedly arranged at the lower end of the elastic wearing belt, the disassembling and assembling structure comprises a telescopic sliding sleeve, a limiting mechanism and an elastic clamping sleeve, the surface movable mounting of flexible sliding sleeve has stop gear, the inside of flexible sliding sleeve is inlayed and is equipped with the elastic clamping sleeve.

Further, one side fixed surface of adjusting the balladeur train installs the axis of rotation, L shape mounting groove has been seted up on adjusting the casing's surface, the adjusting screw surface that the roller was changeed in the rolling is provided with the spiral line, the adjusting screw department cover that the roller was changeed in the rolling is equipped with the fastening knob, the surface set screw hole of fastening knob, the surface of fastening knob is provided with anti-skidding line, can little amplitude control elasticity wear the length of area, satisfies the different users and adjusts the elasticity degree according to the demand when wearing the goggles, effectively improves the comfort level when the user wears, wears the area at elasticity and takes elasticity inefficacy after, and the area is worn to elasticity shifts out adjusting the casing together with adjusting the balladeur train, takes off the public subsides of magic from the female subsides department of pasting of rolling roller, and these operations can wear the area to elasticity and carry out dismouting and change, effectively improves the life of goggles.

Furthermore, the limiting mechanism comprises a guiding slide block, a limiting pressure plate, an anti-collision gasket and a reset spring, the limiting pressure plate is fixedly arranged on the surface of one side of the guiding slide block, the anti-collision gasket is fixedly arranged on the lower surface of the limiting pressure plate, a telescopic sliding cavity is arranged inside the telescopic sliding sleeve, the reset spring is arranged inside the telescopic sliding cavity of the telescopic sliding sleeve, the upper surface and the lower surface of the elastic sleeve are respectively provided with a sleeve embedding port, the surface of one side of the telescopic sliding sleeve is provided with a guiding sliding chute, after the surface of the goggles lens is glided or damaged, the work of disassembling the goggles lens is convenient, a new goggle lens is arranged at the convex end edge in the inner cavity of the goggle bracket, the embedding port of the goggle lens is clamped on the telescopic sliding sleeve, finally the limiting pressure plate tightly presses the goggle lens under the resilience force of the reset spring, and the flexible assembly mode of the goggle lens and the goggle bracket is favorable for subsequent disassembly and replacement, the method is beneficial to the reutilization of limited resources, and reduces the cost of directly discarding the goggles due to the damage of accessories.

Furthermore, a goggle loading cavity is arranged in the goggle bracket, and a protruding end edge is fixedly arranged on the edge of the inner wall of the goggle bracket at the lower end.

Further, the lower surface of the elastic washer is provided with a rubber sleeve opening, the inner side fixed surface of the elastic washer is provided with an assembling clamping plate, the surface of the goggle lens is provided with an embedding opening, when the goggle lens is assembled, the rubber sleeve opening at the bottom of the elastic washer is embedded with the upper end face of the goggle bracket, and the assembling clamping plate is directly embedded into the elastic clamping sleeve of the telescopic sliding sleeve, so that the risk that the elastic washer falls off from the goggle bracket can be reduced.

Furthermore, the telescopic sliding sleeve is fixedly connected with the inner wall of the goggle bracket, the guide sliding block vertically slides in the telescopic sliding cavity of the telescopic sliding sleeve, and the elastic clamping sleeve is fixedly connected with the inner wall of the telescopic sliding cavity of the telescopic sliding sleeve.

Furthermore, one end of the reset spring is fixedly connected with the lower surface of the guide sliding block, and the other end of the reset spring is fixedly connected with the inner bottom wall of the telescopic sliding sleeve.

Furthermore, the elastic washer is assembled with the clamping sleeve embedding port after being embedded into the elastic clamping sleeve through the assembling clamping plate, and the embedding opening of the goggle lens is matched with the telescopic sliding sleeve in a clamping manner.

Further, adjust the casing and protect the fixed surface of eyepiece mount to be connected, the roller was changeed in the rolling adjusting screw rotates with the regulation casing to be connected, the female subsides of magic are located the roller was changeed in the rolling fixed surface to be connected, the fastening knob passes through screw hole and adjusting screw threaded connection.

Further, the belt is worn to elasticity and the female adhesion of pasting of magic that changes the roller through magic male paste and rolling mutually, adjust the balladeur train and match with the opening block of adjusting the casing, adjust the balladeur train and pass through the L shape mounting groove department that the casing was adjusted in the axis of rotation embedding, the middle part sliding port of adjusting the balladeur train wears area sliding connection with elasticity, it is provided with two altogether to adjust the both ends that the casing is located the belt is worn to elasticity.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) through the adjustment mechanism who sets up, can adjust the length that the area was worn to elasticity by a small margin, adjust the elasticity degree according to the demand when satisfying different users and wearing the goggles, comfort level when effectively improving the user and wearing, after the area elasticity became invalid is worn to elasticity, the area was worn to elasticity along with adjust the balladeur train and shift out the regulation casing, the female subsides of magic of taking off the public subsides of roller are changeed to the winding, these operations can wear the area to elasticity and carry out dismouting and change, effectively improve the life of goggles.

(2) Through the dismouting structure that sets up, behind goggles lens surface smooth flower or damage, conveniently dismantle goggles lens's work, the protruding end limit department in the inner chamber of goggles frame is put into to new goggles lens, and goggles lens's embedding opening department card is on flexible sliding sleeve, spacing clamp plate compresses tightly goggles lens under reset spring's resilience force effect at last, goggles lens is favorable to follow-up dismantlement to be changed with the nimble mode of assembling of goggles frame, be favorable to the reuse of limited resource, reduce the goggles and directly abandon the cost that produces because of the accessory damages.

(3) Through the elastic clamping sleeve and the equipment cardboard that set up, when the equipment, the rubber sleeve mouth of elastic washer bottom and the up end gomphosis of goggles frame, during the elastic clamping sleeve of the flexible sliding sleeve of equipment cardboard direct embedding simultaneously, can reduce the risk that elastic gasket drops from goggles frame like this.

Drawings

FIG. 1 is an overall first structural schematic of the present invention;

FIG. 2 is a schematic view of the overall split structure of the present invention;

FIG. 3 is an overall second structural schematic of the present invention;

FIG. 4 is a schematic view of the adjusting mechanism of the present invention;

FIG. 5 is a schematic view of the elastic wearing band structure of the present invention;

FIG. 6 is an enlarged view taken at A of FIG. 4 in accordance with the present invention;

FIG. 7 is a schematic view of the structure of the present invention;

fig. 8 is a sectional view of the telescopic sliding sleeve of the present invention.

In the figure: 1. an eyewear platform; 2. an elastic wearing band; 3. a goggle lens; 4. the goggles are arranged in the cavity; 5. an elastic washer; 6. an adjustment mechanism; 7. a disassembly and assembly structure; 8. adjusting the shell; 9. an adjustment carriage; 10. a magic male sticker; 11. a rotating shaft; 12. a winding roller; 13. a magic female sticker; 14. adjusting the screw rod; 15. an L-shaped mounting groove; 16. fastening a knob; 17. a threaded hole; 18. anti-skid lines; 19. a guide chute; 20. a telescopic sliding sleeve; 21. a limiting mechanism; 22. an elastic card sleeve; 23. the cutting sleeve is embedded into the port; 24. a guide slider; 25. a limiting pressure plate; 26. an anti-collision gasket; 27. a return spring; 28. a telescopic sliding cavity; 29. embedding a gap; 30. assembling a clamping plate; 31. a projecting end edge.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Example 1

As shown in fig. 1, 2 and 3, a medical safety glasses convenient to dismantle, including goggles frame 1, one side of goggles frame 1 is provided with elasticity and wears area 2, goggles frame 1's a port inside is provided with protects eyepiece lens 3, goggles frame 1's up end lid is equipped with elastic gasket 5, goggles frame 1's surface is provided with adjustment mechanism 6, goggles frame 1's inner wall is provided with dismouting structure 7, goggles frame 1's inside is provided with the goggles and packs into chamber 4, goggles frame 1's inner wall is located lower extreme edge fixed mounting and has protrusion end limit 31.

Example 2

As shown in fig. 4, 5 and 6, an adjusting mechanism of medical safety glasses convenient to disassemble comprises an adjusting shell 8, an adjusting carriage 9, a magic male sticker 10, a rolling rotating roller 12, a magic female sticker 13 and an adjusting screw 14, wherein the adjusting shell 8 is movably mounted on the surface of the adjusting shell 14, the adjusting screw 14 is sleeved with the rolling rotating roller 12 on the outer surface, the magic female sticker 13 is sleeved on the surface of the rolling rotating roller 12, the adjusting carriage 9 is sleeved on the surface of an elastic wearing belt 2, the magic male sticker 10 is fixedly mounted at the lower end of the elastic wearing belt 2, a rotating shaft 11 is fixedly mounted on the surface of one side of the adjusting carriage 9, an L-shaped mounting groove 15 is formed on the surface of the adjusting shell 8, spiral threads are arranged on the surface of the adjusting screw 14 of the rolling rotating roller 12, a fastening knob 16 is sleeved on the adjusting screw 14 of the rolling rotating roller 12, a threaded hole 17 is formed on the surface of the fastening knob 16, the outer surface of the fastening knob 16 is provided with anti-skid grains 18, the adjusting shell 8 is fixedly connected with the surface of the goggle bracket 1, the adjusting screw 14 of the rolling rotary roller 12 is rotatably connected with the adjusting shell 8, the magic female sticker 13 is positioned on the surface of the rolling rotary roller 12, the fastening knob 16 is in threaded connection with the adjusting screw 14 through a threaded hole 17, the elastic wearing belt 2 is adhered to the magic female sticker 13 of the rolling rotary roller 12 through the magic male sticker 10, the adjusting carriage 9 is matched with the opening of the adjusting shell 8 in a clamping manner, the adjusting carriage 9 is embedded into the L-shaped mounting groove 15 of the adjusting shell 8 through a rotating shaft 11, the middle sliding opening of the adjusting carriage 9 is in sliding connection with the elastic wearing belt 2, two ends of the adjusting shell 8, which are positioned at the two ends of the elastic wearing belt 2, and the fastening knob 16 is screwed outwards when in use, make the rolling change roller 12 through adjusting screw 14 in the inside rotation of adjusting housing 8, thereby area 2 can supply the rolling to change roller 12 surface at the rolling to elasticity is worn, thereby the length of area 2 is worn to small amplitude adjustment elasticity, adjust the elasticity degree according to the demand when satisfying different users and wear the goggles, comfort level when effectively improving the user and wearing, wear 2 elasticity inefficacy backs in area at elasticity, can pull down regulation balladeur train 9, rotation axis 11 department is drawn out from L shape mounting groove 15 of adjusting housing 8, thereby area 2 is worn to elasticity and is shifted out adjusting housing 8 together with regulation balladeur train 9, take off magic male subsides 10 from the female 13 departments of magic of rolling change roller 12, these operations can wear area 2 to elasticity and carry out dismouting and change, effectively improve the life of goggles.

Example 3

As shown in fig. 7 and 8, a disassembly and assembly structure of medical protective glasses convenient to disassemble includes a telescopic sliding sleeve 20, a limiting mechanism 21 and an elastic ferrule 22, the surface of the telescopic sliding sleeve 20 is movably installed with the limiting mechanism 21, the elastic ferrule 22 is embedded inside the telescopic sliding sleeve 20, the limiting mechanism 21 includes a guide slider 24, a limiting pressure plate 25, a crash pad 26 and a return spring 27, the surface of one side of the guide slider 24 is fixedly installed with the limiting pressure plate 25, the lower surface of the limiting pressure plate 25 is fixedly installed with the crash pad 26, the telescopic sliding sleeve 20 is internally provided with a telescopic sliding cavity 28, the return spring 27 is arranged inside the telescopic sliding cavity 28 of the telescopic sliding sleeve 20, the upper surface and the lower surface of the elastic ferrule 22 are both provided with ferrule embedding ports 23, the surface of one side of the telescopic sliding sleeve 20 is provided with a guide chute 19, the telescopic sliding sleeve 20 is fixedly connected with the inner wall of the goggle frame 1, the guide slide block 24 vertically slides in the telescopic slide cavity 28 of the telescopic slide sleeve 20, the elastic ferrule 22 is fixedly connected with the inner wall of the telescopic slide cavity 28 of the telescopic slide sleeve 20, one end of the return spring 27 is fixedly connected with the lower surface of the guide slide block 24, the other end of the return spring 27 is fixedly connected with the inner bottom wall of the telescopic slide sleeve 20, after the surface of the goggle lens 3 slides or is damaged, the limit pressure plate 25 is pulled upwards to drive the guide slide block 24 to slide in the telescopic slide cavity 28 of the telescopic slide sleeve 20 and stretch the return spring 27, so that the anti-collision gasket 26 at the bottom of the limit pressure plate 25 is separated from the surface of the goggle lens 3, the position of the goggle lens 3 is adjusted and taken out from the gap of the goggle bracket 1 to finish the work of disassembling the goggle lens 3, a new goggle lens 3 is placed in the convex end edge 31 in the inner cavity of the goggle bracket 1, and the embedded opening 29 of the goggle lens 3 is clamped on the telescopic slide sleeve 20, finally, the limiting pressure plate 25 compresses the goggles 3 under the action of the resilience force of the return spring 27, the mode of flexibly assembling the goggles 3 and the goggles frame 1 is favorable for subsequent disassembly and replacement, the limited resources are favorably recycled, and the cost of directly discarding the goggles due to the damage of accessories is reduced.

Example 4

As shown in fig. 1-4, an elastic ferrule and an assembling clamp plate of medical safety glasses convenient to disassemble, wherein a rubber sleeve opening is arranged on the lower surface of an elastic washer 5, an assembling clamp plate 30 is fixedly installed on the inner side surface of the elastic washer 5, an embedding notch 29 is formed in the surface of a goggle lens 3, the elastic washer 5 is assembled with a ferrule embedding opening 23 after being embedded into an elastic ferrule 22 through the assembling clamp plate 30, the embedding notch 29 of the goggle lens 3 is matched with a telescopic sliding sleeve 20 in a clamping manner, when the medical safety glasses are used, the rubber sleeve opening at the bottom of the elastic washer 5 is embedded with the upper end face of a goggle frame 1, and the assembling clamp plate 30 is directly embedded into the elastic ferrule 22 of the telescopic sliding sleeve 20, so that the risk that the elastic washer 5 falls off from the goggle frame 1 can be reduced.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. Although embodiments of the present invention have been shown and described, it is not intended to limit the scope of the invention, which is defined by the appended claims and their equivalents, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, which are within their scope of protection, as defined in the following claims and their equivalents, and which are to be embraced therein by the principles of the invention as defined in the claims and their equivalents.

Claims

1. The utility model provides a medical safety glasses convenient to dismantle, includes goggles frame (1), one side of goggles frame (1) is provided with elasticity and wears area (2), the inside safety glasses piece (3) that are provided with of a port of goggles frame (1), its characterized in that: protect the up end lid of eyepiece mount (1) and be equipped with elastic washer (5), the surface of protecting eyepiece mount (1) is provided with adjustment mechanism (6), the inner wall of protecting eyepiece mount (1) is provided with dismouting structure (7), adjustment mechanism (6) are including adjusting casing (8), regulation balladeur train (9), the public subsides of magic (10), the rolling is changeed roller (12), the female subsides of magic (13) and adjusting screw (14), the surface activity who adjusts casing (8) installs adjusting screw (14), the surface cover of adjusting screw (14) is equipped with the rolling and is changeed roller (12), the surface cover that the rolling was changeed roller (12) is equipped with the female subsides of magic (13), the surface cover that area (2) was worn to elasticity is equipped with adjusts balladeur train (9), the lower extreme fixed mounting that area (2) was worn to elasticity has the public subsides of magic (10), dismouting structure (7) are including flexible sliding sleeve (20), Stop gear (21) and elastic card cover (22), the surface movable mounting of flexible sliding sleeve (20) has stop gear (21), elastic card cover (22) are inlayed and are equipped with to the inside of flexible sliding sleeve (20).

2. The medical safety glasses with easy detachment according to claim 1, wherein: one side fixed surface of adjusting carriage (9) installs axis of rotation (11), L shape mounting groove (15) have been seted up on the surface of adjusting casing (8), the rolling is changeed adjusting screw (14) surface of roller (12) and is provided with the spiral line, the rolling is changeed adjusting screw (14) department cover of roller (12) and is equipped with fastening knob (16), threaded hole (17) have been seted up on the surface of fastening knob (16), the surface of fastening knob (16) is provided with anti-skidding line (18).

3. The medical safety glasses with easy detachment according to claim 2, wherein: stop gear (21) are including direction slider (24), limiting pressure plate (25), crashproof gasket (26) and reset spring (27), one side fixed surface of direction slider (24) installs limiting pressure plate (25), the lower fixed surface of limiting pressure plate (25) installs crashproof gasket (26), the inside of flexible sliding sleeve (20) is provided with flexible sliding chamber (28), the flexible sliding chamber (28) inside of flexible sliding sleeve (20) is provided with reset spring (27), cutting ferrule embedded port (23) have all been seted up to the upper surface and the lower surface of elastic cutting ferrule (22), direction spout (19) have been seted up to one side surface of flexible sliding sleeve (20).

4. The medical safety glasses with easy detachment according to claim 3, wherein: the inside of goggles frame (1) is provided with goggles and loads into chamber (4), the inner wall of goggles frame (1) is located lower extreme edge fixed mounting and has protrusion end limit (31).

5. The medical safety glasses with easy detachment according to claim 4, wherein: the lower surface of the elastic washer (5) is provided with a rubber sleeve opening, the inner side surface of the elastic washer (5) is fixedly provided with an assembling clamping plate (30), and the surface of the goggle lens (3) is provided with an embedded notch (29).

6. The medical safety glasses with easy detachment according to claim 5, wherein: the telescopic sliding sleeve (20) is fixedly connected with the inner wall of the goggle bracket (1), the guide slider (24) vertically slides in a telescopic sliding cavity (28) of the telescopic sliding sleeve (20), and the elastic clamping sleeve (22) is fixedly connected with the inner wall of the telescopic sliding cavity (28) of the telescopic sliding sleeve (20).

7. The medical safety glasses with easy detachment according to claim 6, wherein: one end of the return spring (27) is fixedly connected with the lower surface of the guide sliding block (24), and the other end of the return spring (27) is fixedly connected with the inner bottom wall of the telescopic sliding sleeve (20).

8. The medical safety glasses with easy detachment according to claim 7, wherein: the elastic washer (5) is embedded into the elastic clamping sleeve (22) through an assembling clamping plate (30) and then assembled with the clamping sleeve embedding port (23), and the embedding notch (29) of the goggle lens (3) is clamped and matched with the telescopic sliding sleeve (20).

9. The medical safety glasses with easy detachment according to claim 8, wherein: adjust casing (8) and the fixed surface of goggles frame (1) and be connected, the adjusting screw (14) of roller (12) are changeed in the rolling and are rotated with adjust casing (8) and be connected, the female subsides of magic (13) are located the fixed surface of rolling and change roller (12) and are connected, fastening knob (16) are through screw hole (17) and adjusting screw (14) threaded connection.

10. The medical safety glasses with easy detachment according to claim 9, wherein: area (2) are worn to elasticity and are pasted (13) mutually through magic male plaster (10) and female the subsides of magic of rolling commentaries on classics roller (12), adjust balladeur train (9) and the opening block matching of adjusting casing (8), adjust balladeur train (9) and pass through L shape mounting groove (15) department that axis of rotation (11) embedding adjusted casing (8), area (2) sliding connection is worn with elasticity to the middle part sliding opening of adjusting balladeur train (9), it is provided with two altogether to adjust casing (8) to be located the both ends that area (2) were worn to elasticity.