JP3145066U - Sound insulation earplugs - Google Patents

Abstract

Provided is a sound insulation earplug that can be easily and quickly attached and detached, has a good pressure contact state with respect to an inner wall of an external auditory canal, and does not change a pressure contact force due to aging deterioration of a material or the like.
By pulling an operating rod 8 rearward by a tension holding means (compression spring 13 or the like), a tapered projection 9 is brought into contact with the front end hole edge of the insertion hole 4 from the front, and each elastic movable piece portion 7 is expanded and the elastic covering member 2 is pressed against the inner wall of the external auditory canal 5 and the operation of pushing the operating rod 8 forward causes the tapered protrusion 9 to be detached from the front end hole edge of the insertion hole 4. Each elastic movable piece portion 7 is reduced in diameter through its elasticity, so that a standby state in which the elastic movable piece portion 7 can be attached to and detached from the ear canal 5 is obtained.
[Selection] Figure 1

Description

  The present invention relates to an earplug for sound insulation that is inserted into an external auditory canal to block external noise.

  In this type of earplug for sound insulation, which is integrally formed with rubber or low-resilience urethane foam, since the pressure contact force against the inner wall of the ear canal is weak, it is easy to transmit external noise, and its sound insulation effect is low There is a problem. In view of this, a sound insulation earplug having a configuration capable of increasing the pressure contact force against the inner wall of the ear canal has been proposed (see Patent Document 1). This is because the flange portion that closes the open end of the ear canal and the introduction tube portion that can be inserted into the ear canal are integrally formed of a flexible synthetic resin, and are further screwed into a nut member that is fixed to the flange portion. A pressing member having a hook shape or the like is pivotally attached to the tip of a floating bolt that can be screwed in the portion. Then, with the introduction tube portion inserted into the external auditory canal, the idler bolt is rotated and screwed to move the distal end pressing member to the depth of the introduction tube portion, and is pressed in the outer diameter direction along with the movement. The introduction tube portion can be brought into pressure contact with the inner wall of the ear canal.

Also, there is an aircraft earplug that can press the rubber material inserted into the ear canal against the inner wall of the ear canal in order to prevent adverse effects on the eardrum caused by the pressure difference between the inside and outside of the ear drum that occurs when the aircraft descends. It has been proposed (see Patent Document 2). This is a bag-shaped rubber material opening fixed to the end of a block having a substantially T-shaped cross section, and a push rod is inserted into a through-hole penetrating the block so as to advance and retreat. By pushing the bag-shaped rubber material from the inside with a push rod, the rubber material is stretched into a cylindrical shape so that it has a small diameter that can be inserted into the ear canal.In this state, after inserting into the ear canal, the rubber material is removed by releasing the push rod. Due to its elasticity, it is restored to a bag shape and comes into pressure contact with the inner wall of the ear canal.
Utility Model Registration No. 3080509 Japanese Utility Model Publication No. 63-40919

  By the way, in the above-described prior art, in the case where the idler bolt is rotated and screwed to move the pressing member at the tip within the introducing cylinder part, it takes time to rotate the idler bolt, and the screw is advanced. There is a problem that the speed is slow and the pressing member cannot be moved quickly, and in the case where the rubber material is restored to a bag shape by its elasticity, only the restoring force due to the elasticity of the rubber material is used. Since the rubber material is pressed against the inner wall of the ear canal, the pressure of the rubber material against the inner wall of the ear canal is weak, and if a rubber material with a strong restoring force is selected to increase this pressure contact force, the rubber material when inserted into the ear canal There is a problem that it is difficult to deform the cylinder into a cylindrical shape, and further, there is a problem that the restoring force is easily attenuated due to the aging of the rubber material.

  The present invention has been made in view of such a conventional situation, and can be easily and quickly attached to and removed from the ear canal, has a good pressure contact state with respect to the inner wall of the ear canal, and the pressure contact force also deteriorates over time. An object of the present invention is to provide an earplug for sound insulation that does not change due to the like.

  The present invention is a sound insulation earplug that is inserted into the ear canal to block external noise, is formed in a substantially cylindrical shape, has an insertion hole therethrough, and has an axis line at the front end that is inserted into the ear canal. An inner cylindrical body provided with a plurality of elastic movable pieces that are divided in the circumferential direction by a plurality of cut grooves along the direction and provided so as to be able to expand, and is inserted into the insertion hole so as to be able to advance and retract, and forward to the front end The front end of the insertion hole surrounded by each of the elastic movable pieces is provided with a frustoconical tapered protrusion that can abut from the front, and the rear end is the rear of the inner cylinder. An operation rod projecting rearward from the end; a tension holding means for pulling the operation rod rearward to hold the tension position; and an elastic covering member for covering the inner cylindrical body. By pulling the operating rod backward with the The taper-shaped protrusion is brought into contact with the inner edge of the ear canal by the sound insulation state in which each elastic movable piece is abutted and the elastic covering member is pressed against the inner wall of the ear canal, and the operation rod is pushed forward. A sound-insulating earplug characterized in that the elastic movable piece portion is detached from the inner diameter and the diameter of each elastic movable piece portion is reduced through the elasticity so that the elastic movable piece portion can be attached to and detached from the ear canal.

  In such a sound insulating earplug, the tension holding means is a compression spring that is interposed between the rear end of the inner cylinder and the rear end of the operating rod in a compressed state, and pulls the operating rod rearward by elastic force A configuration is proposed. As this compression spring, a coiled helical spring can be suitably used.

  Further, as another tensile holding means, it is rotatably supported via a support shaft on a bearing portion coupled to the rear end of the inner cylindrical body, and one end is connected to the rear end of the operating rod. A drive lever for moving the operating rod forward and backward by rotation, and a rear protrusion from the rear end of the inner cylinder, and a plurality of engagement grooves are formed along the front-rear direction. The structure which consists of a locking member which can selectively engage the other end of is proposed.

  Further, a tapered hole having an inclined inner surface that is inclined in the same direction as the tapered surface of the tapered protrusion in the expanded state of each elastic movable piece portion at the front end hole edge of the insertion hole penetrating the inner cylinder. A configuration in which the part is formed is proposed.

  Further, a configuration is proposed in which each elastic movable piece is formed with a bulging portion that bulges in the outer peripheral direction and expands the pressure contact area of the elastic covering member against the inner wall of the ear canal.

  The present invention is a taper-like protrusion that pulls the operating rod rearward by a tension holding means and abuts the front end hole edge of the insertion hole from the front while the inner cylinder body covered with the elastic covering member is inserted into the ear canal. By expanding each elastic movable piece part in the outer peripheral direction by this, the elastic covering member pressed in the outer peripheral direction with the expansion of each elastic movable piece part can be brought into pressure contact with the inner wall of the ear canal. In this pressure contact state, the external auditory canal is shielded, and a sound insulation state in which external noise is blocked can be obtained. Further, in this sound insulation state, when the operating rod is pushed forward, the tapered protrusion is detached from the edge of the front end hole of the insertion hole, and each elastic movable piece portion is reduced in diameter through the elasticity, and the elasticity to the inner wall of the ear canal Since the pressure contact of the covering member is released, the inner cylinder body covered with the elastic covering member can be taken out from the ear canal. And by pulling the operating rod backward by the pulling holding means in this way, the earplug for sound insulation can be easily and quickly attached to the external auditory canal, while the elastic covering is applied by pushing the operating rod forward. The pressure contact of the member is released, and the member can be removed easily and quickly.

  Here, the tension holding means is a compression spring that is interposed between the rear end of the inner cylinder and the rear end of the operating rod in a compressed state, and pulls the operating rod rearward by elastic force. It is possible to pull the operating rod backward with a simple structure, and it is possible to maintain the elastic force over a long period of time without causing aging degradation like a rubber material, and it has an appropriate spring coefficient. By selecting and using the compression spring, the pressure contact force of the elastic covering member to the inner wall of the ear canal can be optimized.

  Further, the tension holding means is pivotally supported by a bearing portion coupled to the rear end of the inner cylinder through a support shaft, and one end is connected to the rear end of the operating rod, and the rotation is performed. A drive lever for moving the operating rod forward and backward, and a rear projection from the rear end of the inner cylinder, and a plurality of engagement grooves are formed along the front-rear direction. In the configuration including the engaging member that can selectively engage the end, the operation lever can be pulled rearward or pushed forward quickly by rotating the drive lever. The pulling position of the operating rod can be maintained by selectively engaging the other end of the drive lever with the plurality of engaging grooves when the operating rod is pulled rearward, and the inner wall of the ear canal can be maintained. The strength of the pressure contact force of the elastic covering member can be adjusted stepwise.

  Further, a tapered hole having an inclined inner surface that is inclined in the same direction as the tapered surface of the tapered protrusion in the expanded state of each elastic movable piece portion at the front end hole edge of the insertion hole penetrating the inner cylinder. In the configuration in which the tapered portion is formed, the tapered surface of the tapered protrusion comes into surface contact with the inclined inner surface of the tapered hole when the operating rod is pulled rearward. The pressing force of the tapered surface of the portion is dispersed, and each elastic movable piece portion can be expanded more smoothly.

  Further, in each of the elastic movable piece portions, a bulging portion that bulges in the outer circumferential direction and expands the pressure contact area of the elastic covering member against the inner wall of the ear canal is formed. Since the pressing force against the inner wall is dispersed, local compression on the inner wall of the ear canal can be prevented.

Below, the 1st Example of the earplug for sound insulation concerning this invention is described based on FIGS. 1-3.
As shown in FIG. 1, the sound insulation earplug 1 includes a substantially cylindrical inner cylindrical body 3 covered with an elastic covering member 2. The inner cylinder 3 is made of a synthetic resin having excellent strength and appropriate elasticity, and an insertion hole 4 penetrating through the front and rear ends is provided inside. As shown in FIGS. 2 (A) and 2 (B), the front end portion of the inner cylinder 3 inserted into the ear canal 5 has a plurality of grooves that are divided at equal intervals in the circumferential direction by a plurality of cut grooves 6 along the axial direction. The elastic movable piece portions 7 are provided, and each elastic movable piece portion 7 can be expanded by a tapered protrusion 9 that abuts the front end hole edge of the insertion hole 4 from the front. The elastic covering member 2 is made of low-resilience urethane foam or rubber and covers at least the outer peripheral portion and the front end portion of the inner cylindrical body 3 with a predetermined thickness.

  An operating rod 8 is fitted into the insertion hole 4 of the inner cylinder 3 so as to be able to advance and retreat in the front-rear direction. The front end of the operating rod 8 is provided with a frustoconical tapered protrusion 9 whose diameter increases toward the front, and the tapered surface 10 of the tapered protrusion 9 is formed by the elastic movable piece portion. The front end hole edge of the insertion hole 4 surrounded by 7 can be contacted from the front.

  The rear end of the operation rod 8 protrudes rearward from the rear end of the inner cylinder 3, and a flange portion 12 extending in the outer peripheral direction is provided at the rear end of the operation rod 8. A compression spring 13 including a coiled helical spring that is externally fitted to the operation rod 8 is interposed between the flange portion 12 and the rear end of the inner cylinder 3 in a compressed state. The operating rod 8 is pulled rearward by the elastic force of 13. In this first embodiment, the compression spring 13 constitutes a tension holding means that pulls the operating rod 8 rearward and holds the tension position.

  A tapered hole portion 14 is provided at the front end hole edge of the insertion hole 4 with an inclined inner surface 15 inclined in the same direction as the tapered surface 10 of the tapered protrusion 9 in the expanded state of each elastic movable piece portion. (See FIG. 3) is formed, and the base of the tapered protrusion 9 is accommodated in the tapered hole portion 14.

  Each elastic movable piece portion 7 is provided with a bulging portion 16 bulging in the outer peripheral direction, and the bulging portion 16 enlarges the pressure contact area of the elastic covering member 2 against the inner wall of the external ear canal 5. I am doing so.

  In this configuration, in order to attach the ear plug 1 for sound insulation to the external auditory canal 5, the operation rod 8 is pushed forward against the elastic force of the compression spring 13 as shown in FIG. When the portion 9 is detached from the front end hole edge of the insertion hole 4, each elastic movable piece portion 7 is reduced in diameter through its elasticity, and the sound insulating earplug 1 has a small diameter that can be inserted into the external ear canal 5. In this state, when the sound insulating earplug 1 is inserted into the external auditory canal 5 and the operating rod 8 is released, the operating rod 8 is pulled rearward by the elastic force of the compression spring 13, and as shown in FIG. Each elastic movable piece portion 7 is expanded in the outer peripheral direction by the tapered protrusion 9 that abuts against the front end hole edge from the front, so that the elastic movable piece portion 7 is pressed in the outer peripheral direction as the elastic movable piece portion 7 expands. The elastic covering member 2 can be pressed against the inner wall of the ear canal 5. And the external auditory canal 5 is shielded in this pressure contact state, and the sound insulation state which interrupts external noise can be obtained easily. Further, the compression spring 13 that pulls the operating rod 8 rearward maintains the state in which the elastic covering member 2 is pressed against the inner wall of the external auditory canal 5 by its elastic force. Can be held.

  Further, in the mounted state as described above, the bulging portion 16 that expands the pressure contact area of the elastic covering member 2 with respect to the inner wall of the ear canal 5 is formed on the outer peripheral surface of each elastic movable piece portion 7. The pressure contact force against the inner wall of the ear canal 5 is dispersed by the bulging portion 16, and local pressure on the inner wall of the ear canal 5 can be prevented.

  On the other hand, when the earplug 1 for sound insulation is removed in the above-described mounting state, as shown in FIG. 3, the operating rod 8 is pushed forward, and the tapered protrusion 9 is inserted into the front end hole edge of the insertion hole 4. Each elastic movable piece 7 is reduced in diameter when it is detached from the elastic member, and the pressure-contact of the elastic covering member 2 against the inner wall of the external ear canal 5 is released, so that the sound insulating earplug 1 can be easily taken out from the external ear canal 5. Can do.

  In addition, as shown by a chain line in FIG. 3, a finger hook portion 26 that protrudes rearward from the rear end of the inner cylinder 3 may be provided. Thereby, pushing operation to the front of the operating rod 8 can be performed easily.

  4 (A) and 4 (B) show a modified embodiment of the first embodiment described above, and FIG. 4 (A) shows a tapered hole portion 14 (see FIG. 3) at the front end hole edge of the insertion hole 4. The structure which is not formed is shown. Even in such a configuration, when the operating rod 8 is pulled rearward by the elastic force of the compression spring 13, each elastic movable piece 7 is surrounded by the tapered protrusion 9 that comes into contact with the front end hole edge of the insertion hole 4 from the front. Can be expanded in the direction. Here, if the tapered hole portion 14 (see FIG. 3) is formed at the front end hole edge of the insertion hole 4 as in the first embodiment, the taper of the tapered protrusion 9 is pulled when the operating rod 8 is pulled backward. Since the surface 10 is in surface contact with the inclined inner surface 15 of the tapered hole portion 14, the pressing force of the tapered surface 10 of the tapered protrusion 9 against the inclined inner surface 15 is dispersed, so that each elastic movable piece portion 7 is smoother. Can be expanded.

  FIG. 4B shows a configuration in which the bulging portion 16 (see FIG. 3) is not formed on the outer peripheral surface of each elastic movable piece portion 7. Even in such a configuration, the elastic covering member 2 that is pressed in the outer peripheral direction with the expansion of each elastic movable piece 7 can be brought into pressure contact with the inner wall of the ear canal 5. Here, if the bulging part 16 (refer FIG. 3) is formed in the outer peripheral surface of each elastic movable piece part 7 like a 1st Example, as above-mentioned, with respect to the inner wall of the ear canal 5 by this bulging part 16 The pressure contact force is distributed, and local pressure on the inner wall of the ear canal 5 can be prevented.

  FIGS. 5-7 shows the 2nd Example of the earplug 1 for sound insulation, and this 2nd Example is provided with the tension holding means of the operating rod 8 which consists of another structure. That is, a bearing portion 17 is coupled to the rear end of the inner cylinder 3 toward the rear, and a drive lever 19 is pivotally supported on the bearing portion 17 via a support shaft 18. One end of the driving lever 19 is connected to the rear end of the operating rod 8 via a connecting pin 20, and the operating rod 8 is advanced and retracted by rotating the driving lever 19. Here, at one end of the drive lever 19, a connection hole 21 through which the connection pin 20 is inserted is formed in a long hole shape along the longitudinal direction of the drive lever, and the drive lever is formed by the long hole connection hole 21. The relative displacement of the connecting pin 20 during the 19 rotation is absorbed.

  Further, a locking member 22 is projected from the rear end of the inner cylinder 3 to the rear at a position corresponding to the other end of the drive lever 19, and the locking member 22 has a plurality of engagement grooves. 23 is formed along the front-rear direction. Then, the other end of the drive lever 19 can be selectively engaged with each engagement groove 23. Here, an escape prevention means is provided at the other end of each engagement groove 23 and the drive lever 19 so as not to be disengaged carelessly. This escape prevention means is shown in FIG. 6 (A). As shown in FIG. 6B, inclined surfaces 24a and 24b that can be engaged with each other are provided on the rear edge of each engagement groove 23 and the drive lever 19, or a recess 25a that can be engaged with each other as shown in FIG. And a protrusion 25b.

  In addition, about the component which is common in 1st Example, the code | symbol same as 1st Example is attached | subjected and duplication description is abbreviate | omitted.

  In this configuration, in order to attach the ear plug 1 for sound insulation to the external auditory canal 5, as shown in FIG. 5, the drive lever 19 and the locking member 22 are disengaged from each other and the drive is performed. When the other end of the lever 19 is rotated rearward, the operating rod 8 is pushed forward, and the tapered projection 9 is separated from the edge of the front end hole of the insertion hole 4, each elastic movable piece 7 is moved through its elasticity. The diameter of the earplug 1 is reduced so that the sound insulating earplug 1 can be inserted into the ear canal 5. In this state, when the ear plug 1 for sound insulation is inserted into the external auditory canal 5 and the other end of the drive lever 19 is rotated forward, the operating rod 8 is pulled backward according to the amount of rotation, as shown in FIG. The elastic movable piece portions 7 are expanded in the outer peripheral direction by the tapered protrusions 9 that come into contact with the front end hole edge of the insertion hole 4 from the front, so that the elastic movable piece portions 7 are expanded in the outer peripheral direction. The elastic covering member 2 pressed against the inner wall of the ear canal 5 can be pressed against the inner wall of the ear canal 5. Further, the tension position of the operating rod 8 can be maintained by engaging the other end of the drive lever 19 with any one of the engaging grooves 23 of the locking member 22 in such a pressure contact state of the elastic covering member 2. Can do. In particular, in the tension holding means of the second embodiment, when the operating rod 8 is pulled rearward, the other end of the drive lever 19 is selectively engaged with the plurality of engagement grooves 23, whereby the ear canal is obtained. The strength of the pressure-contact force of the elastic covering member 2 against the inner wall 5 can be adjusted stepwise.

  On the other hand, when removing the earplug 1 for sound insulation, the other end of the drive lever 19 and the engagement groove 23 are disengaged, and the other end of the drive lever 19 is rotated backward as shown in FIG. Then, when the operating rod 8 is pushed forward, the tapered protrusion 9 is detached from the front end hole edge of the insertion hole 4, and each elastic movable piece portion 7 is reduced in diameter through its elasticity, so that the inner wall of the ear canal 5 is reduced. Since the pressure contact of the elastic covering member 2 is released, the ear plug 1 for sound insulation can be easily taken out from the ear canal 5.

  Even in the sound insulation earplug 1 having the tension holding means of the second embodiment, the configuration of the above-described modified embodiment (see FIGS. 4A and 4B) can be applied. is there.

It is a longitudinal cross-sectional view which shows the mounting state of the earplug 1 for sound insulation concerning a 1st Example. (A) is a front view of the inner cylinder 3, and (B) is a side view on the front end side of the inner cylinder 3. It is a longitudinal cross-sectional view which shows the state which pushed in the operating rod 8 of the earplug 1 for sound insulation concerning a 1st Example. It is a longitudinal section showing the modification example of the first example. It is a longitudinal cross-sectional view which shows the state which pushed in the operating rod 8 of the earplug 1 for sound insulation concerning a 2nd Example. It is explanatory drawing which shows the structure of the escape prevention means provided in the engagement groove | channel 23 and the drive lever 19. FIG. It is a longitudinal cross-sectional view which shows the mounting state of the earplug 1 for sound insulation concerning a 2nd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Earplug for sound insulation 2 Elastic covering member 3 Inner cylinder 4 Insertion hole 5 External auditory canal 6 Cut groove 7 Elastic movable piece part 8 Operation rod 9 Tapered protrusion 10 Tapered surface 13 Compression spring (tensile holding means)
14 Tapered hole 15 Sloped inner surface 16 Swelling portion 17 Bearing portion 18 Support shaft 19 Drive lever (tensile holding means)
22 Locking member (Tensile holding means)
23 engaging groove

Claims (5)

An earplug for sound insulation that is inserted into the ear canal to block external noise,
It is formed in a substantially cylindrical shape, has an insertion hole therethrough, and is provided in a front end portion to be inserted into the external auditory canal. An inner cylinder having an elastic movable piece,
A frustoconical taper that is inserted into the insertion hole so as to be able to advance and retreat, expands in diameter toward the front end as it reaches the front, and can come into contact with the front end hole edge of the insertion hole surrounded by each elastic movable piece from the front An operating rod provided with a projection and having a rear end protruding rearward from the rear end of the inner cylindrical body,
Tension holding means for pulling the operating rod backward and holding the tension position;
An elastic covering member that covers the inner cylinder,
By pulling the operating rod backward by the pulling holding means, the tapered protrusion comes into contact with the front end hole edge of the insertion hole from the front, and each elastic movable piece part is expanded so that the elastic covering member is attached to the ear canal. The sound-insulated state that presses against the inner wall and the pushing operation of the operating rod forward causes the taper-shaped protrusion to detach from the front end hole edge of the insertion hole, and each elastic movable piece shrinks its diameter through its elasticity, leading to the ear canal An earplug for sound insulation, characterized in that a stand-by state in which attachment / detachment is possible is obtained.   The tension holding means is a compression spring interposed between the rear end of the inner cylinder and the rear end of the operating rod in a compressed state, and pulls the operating rod rearward by a resilient force. The earplug for sound insulation described. The tension holding means is
Drive that is pivotally supported by a bearing portion coupled to the rear end of the inner cylinder through a support shaft, and one end is connected to the rear end of the operation rod, and the operation rod is advanced and retracted by the rotation. Lever,
A latch that protrudes rearward from the rear end of the inner cylindrical body, and has a plurality of engaging grooves formed along the front-rear direction, so that the other end of the drive lever can be selectively engaged with each engaging groove. The earplug for sound insulation according to claim 1, comprising: a member.   A tapered hole portion having an inclined inner surface that is inclined in the same direction as the tapered surface of the tapered protrusion in the expanded state of each elastic movable piece portion is formed at the front end hole edge of the insertion hole. The earplug for sound insulation according to any one of claims 1 to 3.   5. The bulging portion is formed on each elastic movable piece portion so as to bulge in the outer peripheral direction and expands the pressure contact area of the elastic covering member against the inner wall of the ear canal. The earplug for sound insulation according to item 1.

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