Apparatus for controlling extension and contraction of string and pet muzzle having the same

Abstract

The present invention relates to an elasticity control device capable of automatically contracting while providing elasticity for the length extension of a string, and basically provides an elasticity control device comprising two extension devices that independently support a string drawn out on both sides and extend while providing resistance in the direction of drawing out inside a cylinder.

Description

Technology Field

[0001] The present invention relates to a technology for controlling the elongation or contraction of ropes or cables, and more specifically, to an elongation control device capable of automatically contracting while providing elasticity for the length extension of a string. Background Technology

[0003] Technology for automatically winding and storing ropes or cables has been publicized and is being utilized in various industrial fields through devices such as winders. The aforementioned winder refers to a device designed to wind and store cords or strings, then retrieve and use them when needed. For example, it is applied to wind and store earphone cords, electrical wires, hoses, measuring tapes, etc., allowing them to be retrieved and used when required.

[0004] Korean Patent Publication No. 10-1987-0001690 discloses a traditional wire cord extension device, and FIG. 1 is a perspective view thereof.

[0005] Specifically, the cord (33) can be automatically wound around the outer surface of the rotating disc (32) using the elastic wall of a rubber band or spring (31). The spring (31) is connected to the fixed part of the casing (34) and the rotating disc (32), and the rotating disc (32), which is supported by the shaft (35) of the casing (34) fixed inside, rotates by the restoring elastic force of the spring (31) to wind the cord (33), thereby performing the function of pulling out the cord (33) and then automatically storing it.

[0006] These conventional automatic winders have seen improvements limited to differences in detailed shape or locking mechanisms while maintaining the same basic operating principles.

[0007] However, in the case of the conventional technology described above, numerous problems are found where internal springs or discs are damaged when there is violent pulling. To address this, improvements have been made to increase the durability of the material, but the possibility of damage still exists regarding the internal structure, particularly vulnerable parts such as the connection points of the wound disc or spiral springs.

[0008] In addition, since it is impossible to set the range of extension with the basic winder form, there was a difficulty in having to add a complex equipment configuration to assist with this.

[0009] Furthermore, since these winders are applied to cases where little tension is applied, such as with electrical wires or thin wires, they were difficult to apply to equipment that requires relatively high force. The problem to be solved

[0011] The present invention was devised to solve the above-mentioned problem and aims to provide a string extension control device capable of setting an extension range and flexibly adapting to relatively large forces, and a mouthpiece using the same. means of solving the problem

[0013] The present invention, for solving the above-mentioned problem, provides a string extension control device comprising: a first string (110); a first extension device (2010) that accommodates the end of the first string and provides resistance in the direction in which the first string is extended; a second string (120) connected to the first string to wrap around the mouth area of ​​a pet vertically; a second extension device (2020) that accommodates the end of the second string and provides resistance in the direction in which the second string is extended, but operates independently of the first extension device; a bridge part (1110) that connects the first extension device and the second extension device in the front and back directions and maintains them so as not to rotate while remaining parallel to each other; and a casing (1000) that accommodates the first extension device and the second extension device and allows the first string and the second string to be pulled out in opposite directions from the left and right sides, while allowing them to be pulled out at a distance from each other in the front and back directions.

[0014] Each extension device is equipped with a cylinder (2100), a moving member (2300) to which the ends of the first string and the second string are connected, and an elastic member (2200) that is compressed when the first string and the second string are extended, and by providing resistance when the moving member and the end of the cylinder are compressed when the first string or the second string is extended, the speed of opening the mouth can be delayed.

[0015] The first and second extension devices above may allow rotation so that the first string and the second string can independently adjust their angles in the front and rear directions. Preferably, the elastic member is made of a coil spring, and the first string and the second string may be disposed through the inner circumference.

[0016] In addition, the moving member further includes a sealing portion (2320) that presses the outer circumference against the inner wall of the cylinder, thereby improving sealing and compressibility.

[0017] The above-mentioned first and second expansion devices perform the function of providing resistance during the compression and restoration of the elastic member by the compression of the fluid contained inside the cylinder.

[0018] delete

[0019] It is preferable that the above bridge portion be arranged in a pair to support both sides while connecting the outer sides of the first and second expansion devices inside the casing.

[0020] Additionally, the first and second extension devices can rotate back and forth relative to the bridge section to correspond to deformation of the first and second strings.

[0021] Additionally, it further includes a guide portion (1300) positioned in a portion adjacent to the inlet / outlet portion of the casing to guide the first string and the second string extending upward from the inlet / outlet portion of the cylinder.

[0022] According to another embodiment of the present invention, a string extension control device is provided comprising: a casing (1000); a first string (110) that is inserted into and removed from one side of the casing; a first extension device (2010) that accommodates the end of the first string inside and controls the extension of the first string; and a second string (120) that is coupled to the other side of the casing.

[0023] The first expansion device may be formed by a cylinder (2100) having an inlet / outlet portion (2110) formed on one side, a moving member (2300) that is transported in the longitudinal direction inside the cylinder and connects the end of the first string, an elastic member (2200) disposed between the end wall of the cylinder and the moving member, and a cap portion (2400) that seals the opening of the cylinder.

[0024] Meanwhile, the present invention provides a muzzle comprising the string extension control device, wherein the ends of the first string and the second string are interconnected to form a band portion (100), and the band portion (100) is arranged to surround the mouth area of ​​an animal and provides resistance by delaying the speed at which the mouth opens during the process of opening the mouth. Effects of the invention

[0026] According to the present invention, the extension length can be controlled to a desired distance, and since it can cushion and respond even when relatively large forces are applied, it has the effect of adapting to various installation environments. In particular, unlike conventional automatic winders using spiral springs, since it can be operated through the resistance of fluid and springs, there will be the advantage of smoother operation and improved reliability in use.

[0027] Furthermore, by applying this, it possesses the flexibility to be applied not only to animal muzzles and various movement methods involving specific gap adjustments, but also to various industrial equipment or parts that perform specific opening adjustment movements.

[0028] In addition, when applied to animal muzzles, it overcomes the limitations of conventional muzzles that merely suppress mouth opening, allowing the dog to open its mouth naturally and restricting only sudden movements, thereby minimizing discomfort and improving safety. Brief explanation of the drawing

[0030] FIG. 1 is a perspective view showing a conventional wire cord extension device. FIG. 2 is a perspective view showing the operating part of the string elasticity control device of the present invention. FIG. 3 is an exploded perspective view for explaining the extension device in the string extension control device of the present invention. FIG. 4 is a perspective view illustrating an embodiment in which the string elasticity control device of the present invention is formed in a casing and modularized. FIG. 5 is a perspective view showing a state in which a cover member is coupled to the string extension control device of FIG. 4. FIG. 6 is a plan view illustrating a string elasticity control device according to a modified embodiment of the present invention. FIG. 7 is a drawing illustrating the application of the string elasticity control device of the present invention to use as a mouthpiece. Specific details for implementing the invention

[0031] Hereinafter, a string elasticity control device according to the present invention and an animal muzzle including the same will be described in more detail with reference to the attached drawings.

[0032] The following embodiments combine the components and features of the present invention in a specific form. Each component or feature may be considered optional unless otherwise explicitly stated. Each component or feature may be implemented in a form not combined with other components or features. Additionally, embodiments of the present invention may be constructed by combining some components and / or features. The order of operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment.

[0033] In the description of the drawings, parts, devices, and / or configurations that could obscure the essence of the invention have not been described, nor have parts, devices, and / or configurations that are understandable to those skilled in the art been described. Furthermore, parts referred to by the same reference numerals in the drawings refer to the same components or steps in a device configuration or method.

[0034] Throughout the specification, when a part is described as "comprising" or "including" a component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, terms such as "...part" or "...unit" as used in the specification refer to a unit that performs at least one function or operation. Additionally, "one (a or an)," "one," "the," and similar related terms may be used in the context describing the invention (particularly in the context of the following claims) to include both singular and plural forms, unless otherwise indicated in the specification or clearly contradicted by the context.

[0035] The present invention basically provides an extension control device comprising two extension devices that independently support strings drawn out on both sides and extend while providing resistance in the direction of drawing out inside a cylinder.

[0036] In the description of the present invention, the term "string" may be understood as a general term for cords, ropes, cables, wires, etc., that have a certain degree of flexibility and have a thickness smaller than their length. Accordingly, the thickness, shape, material, and use of the string do not limit the present invention.

[0037] FIG. 2 is a perspective view illustrating the concept of a string elasticity control device according to the concept of the present invention.

[0038] The first string (110) and the second string (120) are arranged so that they can be drawn out in opposite directions from both sides of the overall structure. The strings may be interconnected at unillustrated ends to form a band, and the ends may be open or connected to other devices, which is not excluded.

[0039] In an embodiment of the present invention, the strings are depicted as bands with a width at least twice as wide as their thickness. In cases where the width and thickness differ, a configuration for rotation with the longitudinal axis as an axis during a predetermined stretching operation may be added, and an embodiment related thereto will be described later.

[0040] One end of the first string (110) is connected to the interior of the first extension device (2010), and one end of the second string (120) is connected to the interior of the second extension device (2020).

[0041] The first extension device (2010) and the second extension device (2020) are formed in a cylindrical shape that is long in the longitudinal direction and may have a stroke distance set inside. The stroke may refer to the limit at which the string can be extended, and an example of such operation will be described later.

[0042] The interiors of the first extension device (2010) and the second extension device (2020) include components capable of applying a force to contract, that is, to return to the initial position when the tension is released by providing resistance in the direction of extension. As an embodiment of the above components, an elastic device may be configured inside a predetermined cylinder.

[0043] Meanwhile, since the first extension device (2010) and the second extension device (2020) independently control the extension of the first string (110) and the second string (120) approximately symmetrically, a bridge section (1110) may be added so that they can function as a single device. The bridge section (1110) functions to maintain a parallel state by connecting the outer sides of the first extension device (2010) and the second extension device (2020) to each other.

[0044] FIG. 3 is an exploded perspective view illustrating an embodiment of the stretching device in the string stretching control device of the present invention.

[0045] In the illustrated example, the first expansion device (2010) is described as the reference, and since the second expansion device (2020) may have the same structure as the first expansion device (2010), redundant descriptions are omitted.

[0046] A single expansion device comprises a cylindrical cylinder (2100) that largely encloses an internal structure, a movable member (2300) that can be moved longitudinally inside the cylinder (2100) with the end of a string connected, and an elastic member (2200) that provides resistance or restoring force to the movement of the movable member (2300).

[0047] The above cylinder (2100) is formed as a hollow cylinder, and an opening, an inlet / outlet section (2110), is formed at one end so that the first string (110) can pass through the inside and outside. It is preferable that the inlet / outlet section (2110) be formed in a shape corresponding to the cross-section of the first string (110) to prevent the detachment and contamination of internal parts or materials.

[0048] The above-mentioned moving member (2300) functions as a type of piston and can reciprocate within the cylinder (2100). In order to provide close contact and airtightness between the outer circumference of the moving member (2300) and the inner surface of the cylinder (2100), it is preferable to add a ring-shaped sealing portion (2320) to the outer surface of the moving member (2300). The sealing portion (2320) may be composed of a known elastic sealing material.

[0049] Additionally, on the side facing the inlet / outlet part (2110) of the moving member (2300), a connecting part (2310) for connecting the end of the string may be added. The connecting part (2310) may be, for example, a bar or ring shape that can wrap around a string in the form of a cord, but various techniques for securing known cords or ropes may be applied.

[0050] After the above-mentioned moving member (2300) is inserted into the cylinder (2100), a cap portion (2400) is disposed at the end so as to cover the open side. The cap portion (2400) may include a ring-shaped step that can be inserted into and fixed to the inner end of the cylinder (2100).

[0051] During the process in which the moving member (2300) moves inside the cylinder (2100), the first string (110) may be drawn out or drawn in through the inlet / outlet section (2110) to allow for extension or contraction of the length. At this time, an elastic member (2200) is added between the inner wall of the inlet / outlet section (2110) of the cylinder (2100) and the connecting section (2310) of the moving member (2300) so as to provide resistance in the direction of extension and simultaneously provide a restoring force in the direction of contraction.

[0052] The above elastic member (2200) is preferably a coil spring, but its material or shape is not limited as long as it can provide elastic deformation and restoring force. When such an elastic member (2200) is made of a spring, it is deformed according to the movement of the moving member (2300) while the string is placed on the inner side, thereby applying a predetermined force.

[0053] When the moving member (2300) moves to one side of the cylinder (2100) and withdraws the portion of the first string (110) placed inside from the inlet / outlet part (2110), the elastic member (2200) is compressed, providing resistance to external tension and storing energy. When the tension is released, the moving member (2300) moves to the other side of the cylinder (2100) by the restoring force of the elastic member (2200) and contracts the first string (110). At this time, the cap part (2400) determines the limit of contraction, and the inner wall where the inlet / outlet part (2110) of the cylinder (2100) is placed determines the limit of extension. In this way, the length of the cylinder (2100) determines the stroke length during which the string can be substantially extended.

[0054] As described, when the first string (110) and the second string (120) are connected as a pair and form a loop, the total length that is extended will be twice the stroke of one extension device.

[0055] Meanwhile, during the process of restoration by the restoring force of the elastic member (2200), an excessively fast speed can be corrected by the compression of internal air. As described above, when the moving member (2300) is transferred from one side of the cylinder (2100) to the other side, the air between the other side of the piston-shaped moving member (2300) and the cap part (2400) is compressed, thereby providing resistance to restoration. If the airtightness between the inlet / outlet part (2110) and the moving member (2300) is sufficient to store and compress air to a certain extent, additional resistance can be added during the compression of the elastic member (2200) (when the string is stretched).

[0056] Additionally, as an additional concept, a resistive working fluid may be further included inside the cylinder (2100) to compensate for the speed of elastic deformation. In this case, a predetermined fluid transfer path is added to the outer circumference of the moving member (2300) and functions as a kind of orifice to provide deformation resistance according to the flow of the fluid. The resistance may be determined by the shape and viscosity of the flow path in the part functioning as an orifice. The fluid may be understood to include gas, and thus the function of controlling the orifice resistance may also be applied in the case of air compression.

[0057] Let us examine an embodiment in which a string extension control device is configured by the above configuration.

[0058] FIG. 4 is a perspective view illustrating the state in which the string elasticity control device of the present invention is assembled by a casing.

[0059] The casing (1000) accommodates the first expansion device (2010) and the second expansion device (2020) inside and functions to preserve their position and prevent contamination during operation. The material and shape of the casing (1000) are not limited, but it may have a shape and size capable of securing at least two cylindrical expansion devices. In the illustrated example, it is formed in the shape of a rectangular prism overall.

[0060] For convenience of explanation, the cylinder (2100) of the lower expansion device has been omitted.

[0061] The bridge section (1110) fixes and supports the two cylinders (2100) to maintain an interconnected state. In a preferred embodiment, one is configured on each side.

[0062] Each bridge portion (1110) has a pair of openings formed with an inner circumference corresponding to the outer circumference of the cylinder (2100). The first extension device (2010) can be inserted and fixed from left to right in the illustration, and the second extension device (2020) can be inserted and fixed from right to left.

[0063] The bridge part (1110) maintains the first extension device (2010) and the second extension device (2020) in a mutually parallel state so that independent extension control of the first string (110) and the second string (120) can be performed on both sides, while clarifying the mutual operating relationship.

[0064] The above bridge part (1110) and casing (1000) can be connected by mutual fastening means.

[0065] As described above, in the present invention, a bridge portion (1110) is coupled inside a casing (1000) while connecting the first extension device (2010) and the second extension device (2020) so as to be parallel to each other. In the illustrated example, the front and rear of the casing (1000), which is formed in the shape of a rectangular parallelepiped, and the first extension device (2010) and the second extension device (2020) are arranged parallel to each other in the front and rear directions, but the casing and the first extension device (2010) and the second extension device (2020) may form different angles. For example, the first extension device (2010) and the second extension device (2020) may be arranged in an oblique or diagonal direction with respect to the casing (1000).

[0066] The cap portion (2400) can be attached to the side wall of the casing (1000), and the end portion of the cylinder (2100) formed at the end of the inlet / outlet portion (2110) is positioned so that the end is exposed to the opening formed in the side wall of the casing (1000). Accordingly, the two side walls of the casing (1000) can control the extension of the first string (110) and the second string (120) respectively in a state corresponding to a 180-degree rotation of each other.

[0067] At this time, a predetermined step is formed on the side where the inlet / outlet portion (2110) of the cylinder (2100) is formed, and a step corresponding to the step is formed on the side opening of the casing (1000) so that the cylinder (2100) can function to prevent the cylinder (2100) from escaping to the outside.

[0068] Meanwhile, since the first string (110) and the second string (120) described above can be drawn out of the casing (1000) at a predetermined distance from each other in the front-rear direction, twisting of the entire band may occur, and in an additional concept of the present invention, a concept is presented in which rotation is possible at the drawing portion of the string to compensate for this.

[0069] FIG. 5 is a perspective view showing a state in which a cover member is coupled to a string elasticity control device according to an embodiment of the present invention.

[0070] In one embodiment of the above rotatable concept, the bridge portion (1110) can support the cylinder (2100) so that it can rotate back and forth, and can adjust the angle by rotating in the forward and backward directions by the tension of the string. In the illustrated example, the first string (110) forms an angle that is offset forward relative to the normal from the casing (1000), and the second string (120) forms an angle that is offset backward. Since the second string (120) and the second string (120) can independently adjust their angles, they can flexibly adapt to the installation position when applied to a device in which a string extension control device is applied, as will be described later.

[0071] In an additional embodiment, the bridge portion (1110) may be fixedly coupled to the cylinder (2100) so as not to rotate, while the movable member (2300) may rotate while maintaining a close contact with the cylinder (2100) according to the direction of the tension of the string. In this case, it may also be considered that the portion where the inlet / outlet portion (2110) of the cylinder (2100) is formed is coupled to the cylinder body so as to be rotatable.

[0072] Additionally, a cover member (1200) may be attached to completely cover the open portion on the upper side of the casing (1000). Due to the placement of this cover member (1200), the internal space can be sealed and the expandable operating structure can be protected from external impact.

[0073] In the illustrated example, considering the adaptation of a specific application device, the upper surface of the cover member (1200) is rounded left and right and formed into a concave shape. This will be explained in the embodiment of FIG. 7.

[0074] As described above, one side of the cylinder (2100) is exposed to the outside of the casing (1000), and the inlet / outlet part (2110) is opened.

[0075] A guide section (1300) may be added adjacent to the location of the inlet / outlet section (2110). The guide section (1300) may perform the function of improving durability and operational stability by minimizing unnecessary friction between the outer wall of the casing (1000) and the inlet / outlet section (2110) during the insertion or withdrawal operation of the string.

[0076] In the illustrated embodiment, the guide portion (1300) is composed of a fixed member on the front and rear sides of the inlet / outlet portion (2110) and an elastic member connecting the fixed member. The elastic member may undergo a predetermined deformation in the vertical (or horizontal) direction according to the tension of the string to perform a cushioning function.

[0077] Meanwhile, depending on the application state of the expansion control device of the present invention, it may be necessary to restrict the inflow and outflow from the first expansion device (2010) of the first string (110) and / or the inflow and outflow from the second expansion device (2020) of the second string (120). To this end, a method is proposed to add a locking means (not shown) capable of restricting the expansion state from the inflow / outflow section (2110).

[0078] The locking means may include a pin, hook, bolt, or clip that can be inserted into the cylinder (2100) and can limit the position of the string relative to the cylinder, but if the extension of the string is to be limited, various known locking means that can limit the movement of one or more of the first string (110), second string (120), cylinder (2100), and moving member (2300) may be applied.

[0079] One end of the first string (110) is connected to the interior of the first extension device (2010), and one end of the second string (120) is connected to the interior of the second extension device (2020).

[0080] FIG. 6 is a plan view illustrating a string elasticity control device according to a modified embodiment of the present invention.

[0081] As in the above embodiment, the casing (1000) includes an expansion device, wherein the expansion device is included as a single unit. For better understanding, the interior of the cylinder (2100) is shown as being transparent.

[0082] For example, the first extension device (2010) is illustrated in a manner in which it is selected, but the illustrated orientation does not limit the invention.

[0083] The first expansion device (2010) has a cap portion supported and fixed on the left side, and controls the expansion of the first string (110) from the right side of the casing (1000). Any description redundant with the above regarding this expansion control will be omitted.

[0084] At this time, the second string (120) may be connected to the opposite side of the casing (1000) from which the first string (110) is drawn out, and unlike the example above, it may be connected with one end fixed to the casing (1000). Meanwhile, as in the example above, a connecting device that rotates back and forth may be added to the part of the second string (120) connected to the casing (1000).

[0085] According to this arrangement method, the overall extension is performed by the first extension device (2010), and when the band is configured, the overall extension will correspond to the length of the extension of the first string (110).

[0086] The string extension control device according to the embodiments of the present invention as described above can control the extension length by a predetermined set distance and can respond by cushioning even when a relatively large force is applied, so it can adapt to various installation environments. In particular, unlike the case of a conventional automatic winder using a spiral spring, it can be operated through the resistance of a fluid and a spring, so the operating feel is smoother and reliability in use is improved.

[0087] FIG. 7 is a drawing showing the case where the string elasticity control device of the present invention is applied as an animal muzzle.

[0088] Although this embodiment focuses on dogs, the present invention may also be applied to various types of animals that can be raised as pets, such as cats or pigs.

[0089] The description is based on a pet dog (P), and the string can be applied in a manner that wraps around the mouth area from top to bottom. The first string (110) and the second string (120) drawn from the first elastic device (2010) and the second elastic device (2020) are interconnected at the ends to form a single band portion (100).

[0090] The upper surface of the above cover member (1200) may have a three-dimensional shape that fits the mouth shape of a pet dog as in the embodiment of FIG. 5, and may be in close contact upward from the jaw area as in the illustrated embodiment.

[0091] The inner circumference radius or area changes when viewed from the front depending on the degree to which the band portion (100) is inserted into or removed from the muzzle (3000) arranged as described above. Since the string tension control device of the present invention has a set resistance force, it provides resistance to mouth opening according to the usage environment. In a state where the dog (P) opens its mouth at a relatively slow speed, for example, when making a light sound or eating food, it allows the opening of the mouth, and in a state where the dog opens its mouth aggressively to bark or bite, it can function to prevent the mouth from opening quickly due to the effect of delaying the movement speed of the piston by the fluid.

[0092] In addition, when the above locking means is applied, the limit of mouth opening by the band part (100) can be manually set or the mouth opening can be restricted.

[0093] It should be noted that when the present invention is applied, even if configured in the form of a relatively wide band, the reliability of operation can be guaranteed because it can adapt to different positions or states through rotation to ensure close contact and secure a contact area.

[0094] The string tension control device described above can be applied to animal muzzles as well as various modes of movement that perform a predetermined gap adjustment movement, and can also be applied to various equipment or parts that perform a predetermined opening adjustment movement in industry.

[0095] When applied to animal muzzles, it overcomes the limitations of conventional muzzles that merely suppress mouth opening, allowing the dog to open its mouth naturally and restricting sudden movements, thereby minimizing discomfort while ensuring safety.

[0096] In the foregoing, the present invention has been described in detail based on the embodiments and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims set forth below. Explanation of the symbols

[0098] 100...Band Club 110...1st String 120...2nd string 1000...casing 1100...Bridge Section 1110...1st Bridge 1120...2nd bridge 1200...cover member 1300...Guide section 2010...1st telescopic device 2020...2nd expansion device 2100...cylinder 2110...Inlet / Outlet 2200...Elastic device 2300...Moving member 2310...Connecting part 2320...Sealing part 2400...Cap part 3000...muzzle

Claims

Claim 1 A first string (110); a first extension device (2010) that accommodates the end of the first string and provides resistance in the direction in which the first string is extended; a second string (120) connected to the first string to wrap around the mouth area of ​​a pet vertically; a second extension device (2020) that accommodates the end of the second string and provides resistance in the direction in which the second string is extended, but operates independently of the first extension device; a bridge part (1110) that connects the first extension device and the second extension device in the front and back directions and maintains them so as not to rotate while remaining parallel to each other; and a casing (1000) that accommodates the first extension device and the second extension device and allows the first string and the second string to be drawn out in opposite directions from the left and right sides, while allowing them to be drawn out at a distance from each other in the front and back directions; wherein the first extension device and the second extension device each include a cylinder (2100) and a connection point to which the ends of the first string and the second string are connected A string extension control device comprising a movable member (2300) and an elastic member (2200) that is compressed when the first string and the second string are extended, and which delays the speed of opening the mouth by providing resistance while the space between the movable member and the cylinder end is compressed when the first string or the second string is extended. Claim 2 In claim 1, the first and second extension devices are string extension control devices that allow rotation so that the first string and the second string can independently adjust the angle in the front-rear direction. Claim 3 In claim 1, the elastic member is a coil spring, and the string extension control device is configured such that a first string and a second string are arranged to pass through the inner circumference. Claim 4 In claim 1, the movable member is a string extension control device having a sealing portion (2320) that presses the outer circumference against the inner wall of the cylinder. Claim 5 In paragraph 4, the first and second expansion devices are string expansion control devices that provide resistance during compression and restoration of an elastic member by the compression of a fluid contained inside a cylinder. Claim 6 In claim 5, the bridge portion is a string extension control device arranged in pairs to support the outer sides of the first extension device and the second extension device in a state of mutual connection on the inner side of the casing. Claim 7 In claim 1, the first and second extension devices are string extension control devices connected to the bridge portion so as to be rotatable back and forth. Claim 8 A string extension control device according to claim 1, further comprising a guide portion (1300) disposed in a portion adjacent to the inlet / outlet portion of the casing to guide a first string and a second string extending upward from the inlet / outlet portion formed in the cylinder. Claim 9 delete Claim 10 A muzzle comprising a string extension control device according to any one of claims 1 to 8, wherein the ends of the first string and the second string are interconnected to form a band portion (100), and the band portion (100) is arranged to surround the mouth area of ​​an animal and provides resistance by delaying the speed at which the mouth opens during the process of opening the mouth.

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