JPS6019399Y2 - Switch operation mechanism in rotary dial for telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switch actuation mechanism suitable for use in, for example, a telephone rotary dial in a public telephone.

Generally, public telephones are configured in such a way that calls can be made by inserting toll coins.
Even if it is a free call such as an emergency call, you cannot call the other party unless you insert a toll coin.

However, in the event of an emergency, users do not necessarily have the necessary coins on hand, and in some cases, it may not be possible to make an emergency call from a public telephone.

In addition, with conventional public telephones, even if you dial to make an emergency call, the call is connected to the other party, but since the call is received free of charge, the call circuit on the telephone side is not completed, and the caller is unable to make a call. In some cases, it was impossible to make a complete call, resulting in one-way communication.

Therefore, in order to make an emergency call from a conventional desk-top public telephone, the user must contact the telephone administrator and operate a special key before making the emergency call, which is inconvenient for the user.

In addition, desk-type public telephones installed in places where there is no supervisor are equipped with a special emergency call mechanism and configured to be operated by a push button, or box-type public telephones have a special emergency call mechanism installed near the telephone. A device equipped with a communication device is known.

However, this type of public telephone requires special equipment, etc., and its structure is complicated, resulting in high manufacturing costs. However, it was difficult to provide services over a wide area.

In addition, with the structure described above, when making an emergency call, it is necessary to operate separately from the dial operation.
In the event of an emergency, users sometimes forgot how to operate the system in a hurry and were unable to make an emergency call.

Therefore, when making an emergency call from this type of public telephone, there is a need for some kind of mechanism that can connect the telephone line with a simple operation such as simply dialing the number without inserting coins. Moreover, the mechanism is required to have a simple structure, reliable operation, and low cost.

On the other hand, in other countries, for example, in Australia, "ooo" is set as the emergency number, and in the UK, r999 is set as the emergency number, but in Singapore, for example, the emergency number is set as r996.

r669J, numbers r6J and 19, like '699yo.
In some countries, a three-digit combination of numbers is acceptable.

In such countries, it is necessary to have a switch actuation mechanism that can reliably send a dial impulse and connect a telephone circuit when the user points at the dial numbers r6J and 191 without inserting a coin, for example. , the corresponding dial numbers in this case are located in the middle of the dial numbers rIJ...r g Jr OJ, such as r6 yo and r9 yo, and 2 exists between 17J and rgJ.
Since this is a number, a structure is required so that the switch will not operate when a number larger than this number or a number between them is fingered.

In view of these circumstances, the present invention provides a switch configured to enable free calls when a set number is pointed at, and to make the switch inactive when a number larger than the set number is pointed at. The invention provides a rotary dial for a telephone incorporating a mechanism, and the present invention will be explained in detail below using an embodiment shown in the drawings.

FIG. 1 is a rear view showing an embodiment of a rotary dial for a telephone equipped with a switch actuation mechanism according to the present invention, and FIG. 2 is an enlarged exploded perspective view of essential parts showing only the switch actuation mechanism.

In addition, this embodiment shows a case in which dial impulses are sent out only for certain specific numbers (16, 19, etc.) without the need to insert coins into a public telephone by activating a switch operating mechanism, and The rotary dial for a telephone has a well-known structure other than the switch operating mechanism, and is not the gist of the present invention, so a description of its structure and operation will be omitted.

In these figures, the switch operating mechanism includes a rotating body 2 fixed on a dial shaft 1 and rotating repeatedly, and a switch operating lever portion 3 rotating according to the finger rotation angle of the rotating body 2. , and a contact strip set 4 actuated by the switch actuating lever part 3, which are arranged on the base plate 5 of the telephone rotary dial.

The rotary body 2 is configured to rotate counterclockwise in the figure when the dial is rotated by a dial shaft 1 that repeatedly rotates as the dial is rotated and rotated, and reversely rotates in the clockwise direction when the dial is rotated. .

As shown in FIGS. 1 and 2, a cam disk 7 having an upwardly protruding arcuate cam portion 6 is fixed to the rotating body 2 with screws.

The arcuate cam portion 6 has a predetermined dial number r6. and first and second cam protrusions 8°9 that engage the switch actuating lever portion 3 and rotate it to operate the contact barlet set 4 when the finger 19 is turned; a locking protrusion 10 that engages with the switch actuating lever part 3 and rotates it to recover when it is rolled;
The cam projections 8 and 9 are located on the same circumference and formed in a step shape, and the locking projection 10 is projected outward from the rotation locus of the cam projections 8 and 9.

Note that the cam disk 7 has a notch 11 formed in a part of its outer periphery.
It is positioned and fixed to the rotating body 2 by a positioning protrusion 12 protruding from the rotating body 2.

Further, as shown in FIG. 2, a mounting piece 14 for supporting the switch operating lever portion 3 is bent at one end of the mounting bracket 13 fixed to the upper end of the base plate 5. On the support shaft 15 provided at the tip thereof, there is a pair of operating levers 16 that constitute the switch operating lever part 3.
．． 17 is rotatably supported.

One end 16a of the pair of actuation levers 16.17,
17a corresponds to the first and second cam protrusions 8, 9 and extends so as to be located on their rotation locus, and locking pawls 18, 19 are formed at the tips thereof by bending them toward the back side. ing.

When the dial is not turned, that is, in the normal state,
As shown in FIG. 1, the outer surfaces of the locking claws 18 and 19 are engaged with the locking protrusion 10.

Also, the other end 16b, 17 of each actuation lever 16.17
As shown in FIG. 2, the switch b extends in a direction perpendicular to the one end portions 16a and 17a, and has a switch operating piece 20.21 molded from a synthetic resin material fixed to its tip.

In addition, 22.23 is a stopper for regulating the amount of counterclockwise and clockwise rotation of the operating lever 16.17.
It is bent and formed on the mounting piece 14 of the mounting bracket 13.

Further, torsion springs 24, 25 are interposed between the stopper 22 and the side surfaces of each of the flit levers 16, 17, thereby biasing each operating lever 16, 17 in the counterclockwise direction.

Further, as shown in FIGS. 1 and 2, a pair of bullet strips constituting the contact bullet strip assembly 4 are attached to the bullet strip assembly direct mounting piece 26 bent and formed on the other end of the mounting bracket 13. 27.
28 is installed.

Contact points 27a and 28a are protruded from the ends of the pair of bullet strips 27 and 28 on opposing surfaces thereof, and are normally in a closed state as shown in FIG.

Further, as shown in FIG.
．． Engagement part 2 that engages with switch actuation piece 20° 21 of 17
9.30 are protruded on its upper and lower edges.

These engaging portions 29 and 30 are connected to the switch actuating piece 20.
．． 21 has an engaging piece 29at'30a that is pressed in a direction away from the elastic strip 28, and these engaging pieces 2
On both sides of 9at30a are bent pieces 29b, 29c for guiding and holding the switch operating pieces 20, 21; 30b, 3
0c is formed by bending.

Among these bent pieces 29b, 29c; 30bt 30c, the bent pieces 29b, 30b on the distal side of the bullet strip 27 are formed to be slightly elongated, and the bent pieces 29b, 30b on the distal side of the bullet strip 27 are formed in a slightly elongated shape.
Dial number 16 set by 9, r9. It is configured to lock the tip of the switch actuation piece 20.21 when a smaller number is turned and the actuation lever 16.17 is not rotated.

In addition, the bending pieces 29 c and 30 c are bent when a number larger than the set dial number is pointed.
This is a part for separating the switch actuating pieces 20 and 21 from the switch 7, and holding this state to lock the recovery rotation of the actuating levers 16 and 17.

- On the other hand, the switch actuating piece 2 of the engaging pieces 29a and 30a
As shown in Figure 2, the 0.21 side faces each have 2
Protrusions 31, 32 are provided, which are configured to hold the tip of the switch actuating piece 20, 21 when engaged and restrict its movement (Fig. 4B and Fig. 6A).
reference).

Note that these bullet strips 27 and 28 are screwed to the mounting piece 26 while being kept in an insulated state by a mounting plate 33 and a plurality of spacers 34.

Further, 35 and 36 are connection pieces that connect the wiring to each elastic strip 27 and 28, and 37 is a restriction plate that restricts the movement of the elastic piece 28.

In the above configuration, the operation of this switch actuation mechanism will be explained below.

When the dial is rotated, the rotating body 2 is rotated through the dial shaft 1.
rotates counterclockwise.

As is well known, it is impossible to turn the dial more than one revolution, and the dial shaft 1, that is, the rotating body 2, is rotated by a fixed angle for each dial number.

Utilizing this relationship, the length in the circumferential direction between the arcuate cam portion 6, that is, the cam projections 8 and 9 and the locking projection 10 is set.

In the normal state, as shown in Figure 3 A and H,
The locking pawls 18 and 19 of each operating lever 16 and 17 engage with the locking protrusion 10 of the cam disc 7 and are pressed counterclockwise, and their rotation is further restricted by a stopper 22.

In this case, the switch actuating piece 2 of each actuating lever 16,17
0 and 21 are bent pieces 2 of each engaging portion 29 and 30 of the bullet strip 27.
9b, 30b, and its contacts 27a, 28
A is in a state of makeup.

Now, even if the dial numbers rIJ to 75J are designated and the rotary body 2 is thereby rotated counterclockwise, the rotation angle is the same as that of the cam protrusion 8. −
These cam protrusions 8 are not seen as far as the formation position of 9.
, 9 do not engage with the locking pawls 18, 19 of each operating lever 16,17.

Therefore, each actuating lever 16, 17 remains biased by the torsion spring 24, 25 and does not rotate, and as a result, the contact bar assembly 4 maintains the make state.

Then, the dial shaft 1 is rotated and the cam disk 7 is returned to the state shown in FIG. 3.

Further, when the dial number r6J is pointed, the upper actuating lever 17 moves to the second cam protrusion 9, as shown in FIG. 4A.
However, as shown in FIG. 4B, the lower operating lever 16 is engaged with the first cam protrusion 8 and rotated clockwise by a predetermined angle. be done.

Then, the switch operating piece 20 of the operating lever 16 engages with the engagement piece 29a of the elastic strip 27 and presses it away from the elastic strip 28.

As a result, the contact bullet set 4 breaks and an electrical signal is sent out.

In this case, the switch actuation piece 20 is connected to the protrusion 3 of the engagement piece 29a.
1 to prevent the operating lever 16 from being rotated by inertia force and coming off toward the bending piece 29c.

Further, the actuating lever 16 is rotated to a position where its locking pawl 18 engages with the cam protrusion 8, and is located on the rotation locus.

Next, by rotating the dial, the rotating body 2 is reversely rotated, and the cam projections 8 and 9 and the locking projection 10 are also restored.

Therefore, the locking claw 18 of the actuating lever 16 engages with the restoring locking protrusion 10 and is pressed, returning to the initial position again as shown in FIGS. 3A and 3B.

As a result, the contact bullet set 4 is brought into a closed state.

Also, dial number r7. Or 18. 5A, the upper actuating lever 17 does not yet engage with the second cam protrusion 9, and the switch actuating piece 21 bends the elastic strip 27. The lower actuating lever 16 remains held by the piece 30b.
As shown in FIG. 5B, the locking pawl 18 engages with the first cam protrusion 8 and is pressed, and further rotates to a position where it separates from the cam protrusion 8 and abuts the outer surface of the cam protrusion 8. The stopper 23 restricts clockwise rotation.

At this time, the switch operating body 20 of the actuating lever 16 is locked to the bent piece 29c from the bent piece 29b of the bullet strip 27 via the locking piece 29a, and as a result, the contact bullet group 4
is made and no electrical signal is sent out.

Then, as the dial is scattered, the locking protrusion 10 on the rotating body 2 that is rotated to recover engages and presses the locking pawl 18 of the operating lever 16, and the original state is restored. .

In this case, the locking pawl 18 of the actuating lever 16 is in contact with the outer surface of the cam projection 8, but since the locking projection 10 protrudes further outward than the rotation locus of the cam projection 8, it is easy to is engaged and restored.

Also, when the dial number r9 is pointed to, Fig. 6A,
As shown in B, the upper actuating lever 17 is now rotated by a predetermined angle by the second cam protrusion 9, and the switch actuating piece 21 engages with the engaging piece 30a, causing the contact strip assembly 4 to break. , an electrical signal is sent out.

On the other hand, the lower actuating lever 16 is rotated to the position where its locking pawl 18 contacts the outer surface of the cam projection 8, as in the case described above, and the switch actuating piece 20 is held on the bent piece 29c side. .

Then, as described above, the original state is restored by rotating the dial.

Also, when the dial number r□J is pointed,
As shown in FIG. B, each operating lever 16, 17 is rotated to a position where it engages with the cam projections 8, 9 and abuts the outer surface thereof, and the contact bar assembly 4 is in a closed state.

Then, by turning the dial, it returns to its original state.

Therefore, in the switch actuation mechanism operated as described above, by having a circuit configuration as shown in FIG. can be sent.

That is, in this circuit, the contact DR of the switch actuation mechanism is connected in series with the coin storage contact CC, and these are connected in parallel with the dial impulse contact Di.

Therefore, it is clear that when there are no coins in the public telephone and the contact CC is closed, a pulse can be sent by the contact Di only when the dial numeral r6J or rgJ is pointed and the contact DR breaks. .

In addition, in the above-mentioned embodiment, the dial number r6J (!:
r9. Although the contact bullet set 4 is configured to operate only when the finger is turned, the present invention is not limited to this, and a cam protrusion corresponding to an arbitrary dial number is provided on the rotating body 2. By fixing the cam disk, the setting dial number can be changed freely.

Further, according to the present invention, the cam projections 8 and 9 that engage with the switch actuation lever and the locking projection 10 that rotates the switch actuation lever to recover when it rolls are integrated into the cam disc 7 as the arcuate cam portion 6. For example, as shown in FIG. 9, a locking protrusion 41 may be provided protrudingly on the cam disk 40, and holes 42 corresponding to w dial numbers may be formed. Of these holes 42,
A structure may be used in which cam projections 43 and 44 formed in an abbreviated shape are removably inserted into an arbitrary object and fixed with screws.

In this case, the set number can be easily changed.

As explained above, in the switch actuation mechanism according to the present invention, a cam protrusion corresponding to an arbitrary setting dial number is provided on the rotating body fixed on the dial shaft, and this allows the switch actuation lever to be activated when the dial is turned. The switch is rotated by a predetermined angle, and the switch actuating lever is rotated to move one of the pair of bullet strips that make up the contact bullet strip forward and backward relative to the other, sending out an electrical signal, and further rotating when the dial is scattered. The switch actuation lever is configured to be reversely rotated by a locking protrusion provided on the body to return to its original state, and
A guide bending piece is provided at the tip of one of the bullet strips constituting the contact bullet strip set, so that when a number larger than the setting dial number is pointed, the engagement with the switch actuation lever is released. Moreover, since it is configured to maintain this state, it is possible to obtain a switch that has a simple structure and operates reliably every time a predetermined dial number is turned.

Therefore, if the switch actuation mechanism according to the present invention is applied to a public telephone, a dial impulse can be reliably sent out when a specific number is pointed, even without storing coins.

Further, the setting dial number can be arbitrarily set to an intermediate number other than the end numbers such as 10 yo or r9 yo, and can be adapted to various specifications, which is extremely effective in practical use.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a rear view showing one embodiment of the switch actuation mechanism in a rotary telephone dial according to the present invention, and Fig. 2 is an exploded perspective view showing only the main parts of the switch actuation mechanism in an enlarged manner. Figures 3 to 7 are state diagrams for explaining the operating states, Figure 8 is a circuit diagram when the switch operating mechanism is applied to a public telephone, and Figure 9 is for showing another embodiment. This is a diagram. 1...Dial shaft, 2...Rotating body, 3
...Part of the switch operating lever, 4...Contact bullet assembly 8,9...Cam protrusion, 10...
... Locking protrusion, 16.17 ... Pair of operating levers, 18.19 ... Locking claw, 20.21 ...
...Switch actuation piece, 27.28...Bullet strip, 29 a, 29 b, 29 C, 30a,
30b, 30c... bending piece, 29, 30...
...Engagement part.

Claims (1)

[Scope of utility model registration request] A rotating body that is fixed on a dial shaft and rotates repeatedly, a switch operating lever that is rotated according to the finger rotation angle of the rotating body, and a contact bullet set that is operated by the switch operating lever, The rotary body includes a cam protrusion that engages with the switch operating lever when a predetermined setting dial number is turned, and rotates the cam protrusion to operate the contact bullet group, and a cam protrusion that engages with the switch actuating lever and rotates the lever to actuate the contact barlet set, and a cam protrusion that engages with the switch actuating lever when a predetermined setting dial number is turned, and operates the contact barlet set; A locking protrusion that engages with the operating lever and rotates it to recover is provided;
When the rotary body is rotated to a position where the switch actuation lever is brought into contact with the outer surface of the cam protrusion by being turned with a number larger than the setting dial number, the engagement with the switch actuation lever is released. 1. A switch operating mechanism for a rotary dial for a telephone, characterized in that a bent piece for guiding is formed at the tip of one of the bullet strips constituting the contact bullet strip set so as to maintain the state.