JP2018003202A - Receiver of train approach alarm apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a receiver of a train approach alarm apparatus which can reliably transmit alarm sound only to a person wearing a helmet without touching the person.SOLUTION: A receiver 3 comprises: a body 31 that can be attached to an outer face of a helmet 2; an arm 32 in which, when the body 31 is attached to the helmet 2, one end is rotatable toward or away from the helmet 2 while the other end is pivotally supported on the body 31; and a speaker 33 attached to one end of the arm 32 so that a contact face 33a is directed toward the helmet 2 when the body 31 is attached to the helmet 2. The arm 32 is biased in a direction of bringing the speaker 33 closer to the helmet 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a receiver for a train approach warning device carried by a track maintenance worker or the like.

  There is a so-called train approach warning device among means for notifying track maintenance workers who perform work on a track of the approach of a train traveling on the track. The train approach warning device is a detection means such as a track circuit for detecting that a train has entered a predetermined section, and a transmission means for transmitting a predetermined signal on radio waves based on the detection means detecting that the train has entered. It is composed of a receiver that is carried when the track maintenance worker performs work on the track and that emits an alarm sound when receiving a signal transmitted from the transmission means.

Traditionally, many of the receivers of train approach warning devices are to be stored and carried in work clothes pockets, etc., and since a speaker that emits an alarm sound is directly provided on the receiver body, The alarm sound was output at a considerably high volume so that the user can hear the alarm sound even during work. For this reason, when an alarm sound is sounded on a trajectory passing through a residential area (especially at night when a lot of track maintenance work is performed), it may be annoying to neighboring residents.
Therefore, in recent years, a receiver has been proposed in which the receiver is reduced in size and attached to the helmet, and the speaker is directly applied to the ear so that the alarm sound can be heard only by the person wearing the helmet. (See Patent Document 1).

JP 2004-032340 A

A conventional receiver as shown in Patent Document 1 is fixed to a helmet and used with a speaker placed on the ear of a person wearing the helmet. For example, the helmet is impacted by a fallen object. Then, the speaker may move and injure the ear of the person wearing the helmet.
In addition, depending on the person, there is a problem that when the speaker is in contact with the ear for a long time, the user feels uncomfortable and cannot concentrate on the work.

  The present invention has been made to solve the above problems, and in the receiver of the train approach warning device, the alarm sound can be reliably transmitted only to the person without contacting the person wearing the helmet. The challenge is to do so.

  In order to solve the above problems, the present invention is a receiver of a train approach warning device, a main body attachable to an outer surface of the helmet, and when the main body is attached to the helmet, one end is the An arm whose other end is pivotally supported by the main body so that it can rotate in a direction approaching or leaving the helmet, and when the main body is attached to the helmet, the contact surface is closer to the helmet. A speaker attached to one end of the arm to face the arm, and the arm is biased in a direction to bring the speaker closer to the helmet.

When the present invention is attached to a helmet, the speaker comes into contact with the helmet and transmits sound through the helmet, so that the speaker can hear the sound even if the speaker does not contact the person wearing the helmet. Can do. That is, only the person wearing the helmet can hear the sound transmitted from the speaker. For this reason, it is possible to prevent the surroundings from being disturbed by a loud sound from the receiver.
Moreover, when transmitting a sound via a helmet, the device which transmits the vibration of a speaker to a helmet reliably is needed. For example, if the speaker is integrated with the receiver main body, the main body resonates due to the vibration of the speaker, and thus the helmet to which the receiver is attached may not be sufficiently resonated. However, in the present invention, the speaker is separated from the main body by the movable arm, and the arm is further energized. Therefore, when the present invention is attached to the helmet, the contact surface is pressed against the helmet, and the vibration of the speaker However, it is efficiently transmitted only to the helmet.
Furthermore, since the speaker does not contact the person wearing the helmet, for example, even a person who feels uncomfortable when an object touches the ear can be used comfortably.

In the above invention, the speaker may be pivotally supported at one end of the arm so that the contact surface can be rotated along the vertical direction of the helmet.
Since the outer surface of the helmet is substantially hemispherical, if the speaker is completely fixed to one end of the arm, there will be a gap between the speaker and the helmet depending on the degree of arm rotation ( Only the end of the speaker will come into contact with the helmet). However, since the speaker rotates according to the shape of the outer surface of the helmet, the entire contact surface of the speaker can be brought into contact with the outer surface of the helmet. For this reason, the vibration of the speaker can be more reliably transmitted to the helmet.

In the above invention, the main body can be attached to the helmet via an attachment member, and the attachment member can be engaged with the helmet by sandwiching an edge of the helmet. It is good also as what has the insertion part which protrudes from the said engaging part and can be inserted in the insertion hole formed in the said main body.
In this way, the present invention attached to the helmet 2 by the attachment member does not come off during normal use, but will come off relatively easily when subjected to an impact. For this reason, even if it receives some impacts, such as a main body, an arm, and a speaker colliding with a support, it can prevent that this invention and a helmet are damaged.
There are various types of helmets with different edge shapes, but a plurality of types of attachment members are prepared in which the shape of the support portion differs depending on the shape of the edge of each helmet and the shape of the insertion portion is common. Thus, the receiver can be attached to any shape of helmet.

  ADVANTAGE OF THE INVENTION According to this invention, in the receiver of a train approach warning apparatus, an alarm sound can be reliably transmitted only to the person, without contacting the person wearing the helmet.

It is the perspective view which showed a part of the helmet for track maintenance which concerns on embodiment of this invention. It is the side view which showed the receiver of the train approach warning apparatus which comprises the track maintenance work helmet of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is the graph which showed the output characteristic of the speaker which comprises the receiver of FIG. It is the perspective view which showed the clip which comprises the receiver of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, a schematic configuration of the track maintenance helmet 1 according to the present embodiment will be described. FIG. 1 is a perspective view showing a part of the helmet 1 for track maintenance work.
The track maintenance helmet 1 includes a helmet 2 and a receiver (hereinafter referred to as a receiver 3) of a train approach warning device attached to the outer surface (outer surface) of the helmet 2.
The helmet 2 is a general work helmet that is commercially available. That is, in addition to the cap body 21 formed in a substantially hemispherical body with FRP (fiber reinforced plastic), PC (polycarbonate), ABS (acrylonitrile butadiene styrene), PE (polyethylene), etc., the inner surface of the cap body 21 is made of foamed polystyrene or the like. It is composed of a liner, a headband, a chin strap, etc. (not shown) provided so as to cover.

Next, a specific configuration of the receiver 3 will be described. 2 is a side view of the receiver 3, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. Hereinafter, the direction away from the helmet 2 when viewed from the receiver 3 attached to the helmet 2 will be described as the front, and the direction approaching the helmet 2 will be described as the rear.
As shown in FIGS. 1 and 2, the receiver 3 fixes the main body 31, the arm 32 attached to the main body 31, the speaker 33 attached to one end (upper end) of the arm 32, and the main body 31 to the helmet 2. For example, a clip 34 (attachment means) is used.
The main body 31 includes a hollow box-shaped housing 31a, various operation buttons 31b provided on the front surface (hereinafter referred to as the front surface) of the housing 31a, and a clip formed on the rear surface (hereinafter referred to as the back surface) of the housing 31a. 34, an insertion port 31c, an antenna (not shown) housed in the housing 31a, a control circuit, an amplifier, a battery, and the like. When a radio signal transmitted from a transmitting means (not shown) is received by the antenna, an electric signal for vibrating the speaker 33 is output from the amplifier.

  The arm 32 is formed in a bar shape with an upper portion curved, and the upper portion is pivotally supported by the main body 31 at the lower end thereof so as to bend in the same direction as the back surface of the main body 31. Since the rotation shaft 32a of the arm 32 is a straight line extending in the width direction of the main body 31 (perpendicular to the paper surface of FIG. 2), the arm 32 has an intermediate portion 32b as shown by a solid line in FIG. It is possible to rotate between a position in contact with the front surface of 31 (closer to the helmet 2) and a position where the intermediate part 32b is separated from the main body 31 (away from the helmet 2) as indicated by a two-dot chain line. It has become. A spring (not shown) is wound around a shaft that pivotally supports the arm 32 on the main body 31, and the arm 32 is biased in a direction in which the intermediate portion 32 b approaches the main body 31. A cord (not shown) having one end electrically connected to the amplifier of the main body 31 is passed through the arm 32.

  The speaker 33 has a straight line passing through the upper end portion (screwed portion in the figure) of the arm 32 in the width direction of the main body 31 so that the contact surface 33a faces substantially the same direction as the back surface of the main body 31. It is pivotally supported at the upper end of the arm 32 so that it can be rotated in the vertical direction. The speaker 33 is preferably rotatable about 30 °. When the intermediate portion 32b of the arm 32 comes into contact with the main body 31, the contact surface 33a of the speaker 33 is positioned behind the back surface of the main body 31, as shown in FIG.

  Further, as shown in FIG. 3, the speaker 33 of the present embodiment is provided in the case 33b, the case 33b, in the voice coil 33c, and in the case 33b so as to vibrate with respect to the voice coil 33c. It is composed of a vibrating part 33d and the like. That is, the speaker 33 according to the present embodiment is fixed to the case unlike the conventional magnet coil type speaker that emits sound waves by vibrating the voice coil and the cone paper. In this structure, sound is transmitted by vibrating the vibration portion 33d.

The vibrating portion 33d has a pole piece 33e disposed in the opening of the voice coil 33c, a magnet 33f attached to the back of the pole piece 33e, and a bowl shape. The pole piece 33e and the magnet 33f are surrounded by the voice coil 33c. The housing 33g is composed of an elastic member, and includes a damper 33h (elastic member) that connects the case 33b and the yoke 33g.
The voice coil 33c has a cylindrical shape, is fixed behind the contact surface 33a so as to open in a direction orthogonal to the contact surface 33a, and the other end of the cord that has passed through the arm 32. Electrically connected. Further, the voice coil 33c of the present embodiment can obtain a high sound pressure even at a low voltage by setting the impedance to be low (for example, about 3 to 5Ω).
The magnet 33f is a neodymium magnet having a strong magnetic force, and is formed in a light disk shape (for example, about 5 to 6 g).

In general, a loudspeaker with a larger magnet or voice coil has higher sound output efficiency. However, the speaker 33 of the present embodiment uses a magnet 33f with high magnetic force as well as lowering the impedance of the voice coil 33c. Thus, the size is reduced without lowering the output efficiency than before.
Moreover, the speaker 33 can be configured to vibrate the magnet 33f at a frequency of 600 to 1300 Hz (a central value is around 1 kHz) as shown in FIG. 4 by configuring as described above. This frequency is approximately the same as the resonance frequency of the helmet 2.
Furthermore, since the speaker 33 does not use cone paper, the case 33b can be downsized and a completely waterproof structure can be achieved. That is, it is suitable for outdoor use such as track maintenance work.

As shown in FIG. 5A, the clip 34 includes a support portion 34a that forms a lower portion and an insertion portion 34b that forms an upper portion.
The support portion 34 a has a shape that is obtained by bending a plate, and can be attached to the helmet 2 by sandwiching the edge of the helmet 2.
The insertion part 34b is formed so as to be able to be inserted into the insertion port 31c of the main body 31 so as to be directed upward from the support part 34a.
Thus, the receiver 3 attached to the helmet 2 by the clip 34 does not come off during normal use, but will come off relatively easily when it receives an impact. For this reason, it is possible to prevent the receiver 3 and the helmet 2 from being damaged even if the main body 31, the arm 32, and the speaker 33 are subjected to some impact such as a collision with a support.

  In this embodiment, in addition to the clip 34 shown in FIG. 5 (a), the clip 34b has the same shape of the insertion part 34b and the shape of the support part 34c as shown in FIG. 5 (b). 34A is also used for attachment to the helmet 2. The clip 34 shown in FIG. 5A is used for attachment to the helmet 2 whose edge is gently inclined, and the clip 34A shown in FIG. 5B is attached to the helmet 2 whose edge is warped upward. Used for. Thus, by preparing a plurality of types of clips 34 and 34A in which only the shapes of the support portions 34a and 34c are changed, the receiver 3 of the present embodiment can be attached to various shapes of helmets.

The receiver 3 is attached to the helmet 2 by sandwiching the edge of the helmet 2 with the support portions 34a and 34c of the clips 34 and 34A and inserting the insertion portion 34b of the clips 34 and 34A into the insertion port 31c of the main body 31. Thus, the track maintenance helmet 1 is obtained.
At this time, the speaker 33 rotates according to the shape of the helmet 2 to be in contact, the entire contact surface 33 a is in contact with the helmet 2, and the contact surface 33 a is pressed against the helmet 2 by the urging force of the arm 32. Thereby, the helmet 1 for track maintenance work can transmit the vibration of the speaker 33 to the helmet 2 without being attenuated.

  If the receiver 3 receives a radio signal in the state where the track maintenance helmet 1 is worn by the track maintenance worker, the speaker 33 vibrates, and the helmet 2 resonates accordingly. An alarm sound is transmitted to the track maintenance worker by bone conduction. The speaker 33 is separated from the main body 31 by the movable arm 32, and further, the arm 32 is biased, so that the contact surface 33a is pressed against the helmet 2, and the vibration of the speaker 33 is attenuated halfway. It is efficiently transmitted only to the helmet 2. Moreover, since the speaker 33 outputs a sound by vibrating a magnet, the speaker 33 can be reduced in size without reducing the output, in other words, a sufficient sound pressure can be output without increasing in size. For this reason, vibration sufficient to be heard as sound can be transmitted to the helmet 2. Furthermore, since the magnet 33 of the speaker 33 vibrates at a frequency of 600 to 1300 Hz, the sound can be heard clearly when the helmet 2 resonates. The configuration of the arm 32 and the configuration of the speaker 33 are combined, so that the track maintenance worker wearing the track maintenance helmet 1 can surely hear the alarm sound. As a result, safety in track maintenance work is improved.

In addition, since the sound transmitted by the speaker 33 of the receiver 3 can be heard only by the person wearing the track maintenance helmet 1, even if the track maintenance location is near a residential area (especially at night), There is no need to worry about inconvenience to the surrounding residents even if a warning sound is generated during track maintenance.
Furthermore, since the speaker 33 does not come into contact with the person wearing the track maintenance helmet 1, for example, even a person who cares about things touching the ear can be used comfortably.

As mentioned above, although this invention was concretely demonstrated based on embodiment, this invention is not limited to the said embodiment, It can change in the range which does not deviate from the summary.
For example, FIG. 1 shows a state in which the receiver 3 is attached to the side surface of the helmet 2, but the rear surface may be used as long as it does not contact the wearer who wears the helmet 2. If it does not interfere, it can be attached to the front. Since the helmet 2 is made of a hard material and resonates as a whole, the alarm sound can be heard almost the same regardless of where the receiver 3 is attached.
Further, the vibration frequency of the speaker 33 may be adjusted. If it does in this way, it can also attach and use for the helmet from which a shape and material differ greatly.

DESCRIPTION OF SYMBOLS 1 Helmet for track maintenance 2 Helmet 21 Cap body 3 Receiver 31 Main body 31a Case 31b Operation button 31c Insert port 32 Arm 32a Rotating shaft 32b Intermediate part 33 Speaker 33a Contact surface 33b Case 33c Voice coil (coil)
33d Vibrating portion 33e Pole piece 33f Magnet 33g Yoke 33h Damper (elastic member)
34, 34A Clip (Mounting member)
34a, 34c support part 34b insertion part

Claims (3)

A body that can be attached to the outer surface of the helmet;
An arm whose other end is pivotally supported by the main body so that when the main body is attached to the helmet, the one end can be rotated in a direction approaching or leaving the helmet;
A speaker attached to one end of the arm such that when the main body is attached to the helmet, a contact surface that comes into contact with the helmet faces the helmet;
The receiver of the train approach warning device, wherein the arm is biased in a direction to bring the speaker closer to the helmet.   2. The train approach alarm device according to claim 1, wherein the speaker is pivotally supported at one end of the arm so that the contact surface can be rotated in the vertical direction of the helmet. Receiving machine. The main body can be attached to the helmet via an attachment member,
The mounting member is
An engaging portion that can be engaged with the helmet by sandwiching an edge of the helmet;
The train approach warning according to claim 1, further comprising: an insertion portion protruding from the engagement portion and capable of being inserted into an insertion hole formed in the main body. Equipment receiver.

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