JPS6019400Y2 - 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. Some are known to have telephone equipment installed.

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

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.

In other countries, for example in Australia, 100
In the UK, R999 is set as the emergency number, but in Singapore, the emergency number is '996, for example.

In some countries, it is acceptable to use a three-digit combination of 16. and r9J, such as ``699.''.

In such countries, a switch actuation mechanism is required that can reliably send a dial impulse and connect a telephone circuit even without inserting a coin when the user points at the dial digits r6yo and 79J. In this case, the corresponding dial numbers are r6J and 79J, and the dial numbers r1. ...Since these are two numbers located in the middle between r g and r OJ, and sandwiching r7J and rBJ, the switch is activated when you point at a number larger than this or a number between them. A special structure is required to avoid this.

In view of these circumstances, the present invention has a switch actuation mechanism that is not only simple in structure, reliable in operation, and inexpensive in cost, but also allows free calls to be made reliably for a plurality of set dial numbers. The present invention will be described in detail below using embodiments 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, in this embodiment, specific digits ("6yo" and "79J") are configured to send out dial impulses by activating the switch activation mechanism without the need to insert coins into the public telephone. The rotary dial 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 actuation mechanism includes a rotary body 2 fixed on a dial shaft 1 and repeatedly rotated, a switch actuation lever part 3 that is rotated according to the rotation angle of the rotary body 2, and A set of contact strips 4 actuated by the switch actuating lever portion 3 are arranged on a base plate 5 of the rotary dial for the telephone.

The rotating body 2 is configured so that it rotates counterclockwise in the figure when the dial is rotated and repeatedly rotates clockwise when the dial is rotated by a dial shaft 1 that repeatedly rotates when the dial is rotated and rotated. There is.

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 engages with the switch actuating lever part 3 and rotates it when predetermined dial numbers r6J and r9J are turned, thereby actuating the contact bullet set 4. and second cam protrusions 8, 9, and a locking protrusion 10 that engages with the switch actuating lever part 3 and rotates it to recover when it is disengaged, and the first and second cam protrusions The cam projections 8 and 9 are located on the same circumference and are formed in a stepped 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, at one end of the mounting bracket 13 fixed to the upper end of the base plate 5, a mounting piece 14 for supporting the switch operating lever part 3 is bent and formed, as shown in FIG. A pair of operating levers 16, which constitute the switch operating lever part 3, are mounted on a support shaft 15 provided on the
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 is extended so as to be located on the rotation locus thereof, and a locking pawl 18, 19 is formed at the tip thereof by bending it toward the back side. ing.

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

Also, the other end 16b of each actuation lever 16.17.

17b has one end 16a, 17 as shown in FIG.
A switch actuating piece 20.21 extends in a direction perpendicular to a, and has a bottom-shaped switch operating piece 20.21 fixed to the tip thereof using a synthetic resin material.

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.

Furthermore, a torsion spring 24.25 is interposed between the stopper 22 and the side surface of each operating lever 16.17.
This biases each operating lever 16, 17 in a counterclockwise direction.

Further, as shown in FIGS. 1 and 2, a bullet strip mounting piece 26 bent and formed on the other end of the mounting bracket 13 includes a pair of bullet strips 27 that constitute the contact bullet strip assembly 4. .2
8 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 engaging pieces 29a and 30a that are pressed in a direction away from the elastic strip 28, and these retaining pieces 29
Bent pieces 29b, 29c for guiding and holding the switch operating piece 20.21 on both sides of a and 30a; 30b, 30
c is formed by bending.

These bent pieces 29 b, 29 c; 30 b
, 30 c, the bent piece 2 on the distal side of the bullet strip 27
9b and 30b are formed to be slightly elongated, and are in the normal state or in the dial number "6" set by the cam protrusion 8.9.
J.

When a number smaller than rgJ is pointed, the operating lever 16.
17 is not rotated, the switch actuating piece 20.2
It is configured to lock the tip of 1.

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 detaching the switch actuating piece 20, 21 from the switch 7, maintaining that state, and locking the operating lever 16.degree. 17 from restoring rotation.

On the other hand, as shown in FIG. 2, two protrusions 31 and 32 are provided on the side surfaces of the engaging pieces 29 a and 30 a on the side of the switch actuating pieces 20 and 21, respectively, so that the switch is activated when engaged. It is configured to hold the tips of the actuating pieces 20, 21 and restrict their movement.

(See FIGS. 4B and 6A) These bullet strips 27 and 28 are screwed to the mounting piece 26 while maintaining their insulated state by a mounting plate 33 and a plurality of spacers 34.

Furthermore, reference numerals 35 and 36 are connection pieces that connect the wiring to the elastic strips 27 and 2B, and 37 is a regulating 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 B,
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
0.21 is the bent piece 2 of each engaging part 29, 30 of the bullet strip 27
9b and 30b, and their contacts 27a and 28a are in a made state.

Now, dial numbers 11 to r5. Even if the rotating body 2 is rotated in the counterclockwise direction, the rotation angle does not reach the formation position of the cam protrusions 8 and 9, as shown in FIG. These cam projections 8, 9
does 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.

Also, the dial number r6. When the finger is rotated, the upper actuating lever 17 moves to the second cam protrusion 9, as shown in FIG. 4A.
The lower operating lever 16 is engaged with the first cam protrusion 8 and rotated clockwise by a predetermined angle, as shown in FIG. 4B. Ru.

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, a break electrical signal is sent to the contact bullet set 4.

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.

Furthermore, when the dial number 17 or 18 is selected, the upper operating lever 17 is not yet engaged with the second cam protrusion 9, as shown in FIG. 21 remains held by the bent piece 30b of the bullet strip 27, while the lower actuating lever 16 has its locking piece 18 in the first position as shown in FIG. 5B. is engaged with and pressed by the cam protrusion 8, and is further rotated to a position where it separates from the cam protrusion 8 and comes into contact with the outer surface of the cam protrusion 8,
The stopper 23 restricts clockwise rotation.

At this time, the switch operating piece 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 strip assembly 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 rgJ is pointed, 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 retaining piece 30a, causing the contact bar 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 10 is pointed, Fig. 7A,
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. Impulses can be sent out.

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

Therefore, coins are not stored in the public telephone, and the contact point CC
It will be clear that a pulse can be sent by the contact Di only when the contact DR is broken when the dial number r6J or 19 is in the made state.

In addition, in the embodiment described above, the dial numbers 16 and r9
Although the contact bullet set 4 is configured to operate only when J is pointed, the present invention is not limited to this.
By fixing a cam disk provided with a cam projection corresponding to an arbitrary dial number on the rotating body 2, the set dial number can be freely changed.

Further, according to the present invention, the cam disk 7 is formed by using the arc-shaped cam portion 6 as the cam protrusions 8 and 9 that engage with the switch actuating lever and the locking protrusion 10 that rotates the switch actuating lever to recover when it is rolled.
For example, as shown in FIG. 9, a locking protrusion 41 may be provided protrudingly on the cam disc 40, and holes 42 corresponding to the dial numbers in the example may be formed. It is also possible to prepare a structure in which cam projections 43 and 44 formed in an oval shape are removably inserted into any of these holes 42 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 plurality of cam protrusions corresponding to a plurality of arbitrarily set dial numbers are provided on a rotating body fixed on a dial shaft, so that when the dial is turned, A plurality of switch actuation levers corresponding to the plurality of setting dial numbers are each rotated by a predetermined angle, and one of the plurality of contact bullet groups is selectively actuated by one of the switch actuation levers. The switch actuating lever is configured to be rotated in the opposite direction by a locking protrusion provided on the rotating body to return to the original state when the switch is turned, and furthermore, a dial number between the setting dial numbers is indicated. In some cases, the switch operating lever is configured to come into contact with the outer surface of the corresponding cam protrusion, thereby releasing the operating state of the contact bullet group by the switch operating lever.
If the switch actuation mechanism according to the present invention is applied to a public telephone, dial impulses can be reliably sent out when multiple specific numbers are pointed at without storing coins, and when numbers larger than the set dial number are It is possible to reliably prevent the contact from operating when the finger is turned, which has an extremely large practical effect.

[Brief explanation of the drawing]

FIG. 1 is a rear view showing an embodiment of the switch actuation mechanism in a rotary dial for a telephone according to the present invention, FIG. 2 is an exploded perspective view showing only the main parts of the switch actuation mechanism in an enlarged manner, and FIGS. FIG. 7 is a state diagram for explaining its operating state, FIG. 8 is a circuit diagram when the switch operating mechanism is applied to a public telephone, and FIG. 9 is a diagram showing another embodiment. 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 operating piece, 27, 28... Bullet strip, 29.30... Engaging portion.

Claims (1)

[Scope of utility model registration request] A rotating body that is fixed on a dial shaft and repeatedly rotates, a plurality of switch operating levers that rotate according to the finger rotation angle of this rotating body, and a plurality of contact bullet groups that are respectively operated by the switch operating levers. and when one of a plurality of predetermined setting dial numbers is fingered, the rotating body engages with one of the corresponding switch actuation levers and rotates the lever, thereby causing the contact barring group to rotate. A plurality of cam protrusions that selectively operate one of the cam protrusions, and a locking protrusion that engages with the switch actuating lever and rotates it to recover when the cam protrusion is turned are provided, When a certain dial number is pointed, the first switch actuating lever comes into contact with the outer surface of the corresponding cam protrusion, and the operating state of the corresponding contact bullet group by this switch actuating lever is released. A switch operating mechanism in a rotary dial for a telephone, characterized by the following structure.