US1303351A - Tion of new yoek - Google Patents

Description

R. H. MANSON.

uoox'swncn AND cmcuns mama. APPLICATION FILED DEC. 18, I916.

1,303,351. Patented May 13, 1919.

/1 7T OHNE Y rrnn srATEs PATENT OFFiCE.

RAY H. MANSON, OF ROCHESTER, YORK, ASSIGNOR TO THE STROMBERG-CABLSON TELEPHONE MANUFACTURING COMPANY, OF ROCHESTER, NEW YORK, CORPORA- TION OF NEW YORK.

HOOKSWITCH aiirn crnoorrs THEitnFon.

Specification of Iiett ers fatent. Patented May 13, 1919.

Application med December 1a, 1916. Serial N6. 137,620.

phone systems to arrange the substation apparatus with circuit connections so as to secure the maximum of telephonic transmission when the subscriber speaks into his telephone transmitter.

These circuit connections, however, while producing the above desired results, produce an undesirable result in thatthe side tone effect is increased; that is, there is reproduced in the telephone receiver of the transmitting sub-station to an abnormal degree, the sounds which are projected into the transmitter of that station, the receiver reproducing these sounds to such an abnormal degree that the various noises of the room in which the telephone instrument is pla ed will be heard and will drown out much of the sound in the receiver, due to thefincom ing voice currents from the distant station.

Circuits have also been proposed which will not have this excessive side-tone effect in the receiver but these circuits are invariably attended by a loss in outgoing transmission.

It is particularly the object of this invention to produce a switchhook combination which will permit the use of either type of circuit at the will of the sub-station mstrumerit user, whereby such user can. obtain the use of a telephonic circuit of high transmitting power, or when this is not required, can obtain the use of a circuitin which the sidetone is not so severe, for ordinary local conversations.

Another object of my invention is to provide an improved means for accomplishing the different switchhook positions whereby different circuit connections are caused, so that the same shall be positive in action, have a'pleasing appearance to the eye, at the same time being of durable construction so that it cannot be injured byabuse or by a long continued use.

Other objects of my invention and the inventionitself will be apparent from the accompanying description V of the embodiment illustrated in the drawings.

I have shown an embodiment of my invention in the accompanying drawings, inwhich similar reference characters have been used in the different figures to designate like parts. i

Figure 1 shows partly in cross-section and partly in side elevation a switchhook struc ture of an embodiment constructed in accordance with my invention.

Fig. 2-.N shows an end view of the latch of the switchhook in its normal or unoperated position but illustrated as broken away so as to show the latch mechanism. a i

Fig. 2O likewise shows the switchhook latch in the intermediate or latched position and Fig. 2-P likewise shows the switchhook latch in its released or ultimate position.

At 2 A and 2-D I show normal circuit connections of two forms of my invention at the time the switchhook and latch therefore is in normal position, as shown in Fig. 2N.

At 3B and 3.E I show the circuit connections of the two forms of my invention illustrated in Figs. 2A and 2-D, in the intermediate or latched position of the switchhookas illustrated in Fig. 2().

At l--C and4.F I show the circuit connections of the two forms of my invention illustrated, in the fully operated or released position of the switchhook mechanism illustrated in Fig.

. Figs; 2-A, 3-B and 4 Cil1ustrate circuit connections for the useof my invention in connection with circuits involving the use of what is known as a direct current receiver; that is, such a receiver as is operated with the direct line current passing through its winding.

At Figs. 24), 3-E and 4-1? I illustratelthe use of my invention in connecti'pn with telephone circuits involving the useof firmly between the latch member, are

the ordinar Y magneto receiver which operates Without the direct battery current from the line passing through its winding.

Fig. 1 shows a side elevation of the parts of the switchhook mechanism inclosed inside the telephone casing; it also shows in cross-section the parts of the switchhook mechanism not inclosed inside the telephone casing and comprise a portion of a side of the telephone casing and the external parts, such as the latch L, etc.

The internal parts comprise a frame f, whereon the switchhook lever H is pivoted at p, the switchhook carries an insulated roller 7, contacting normally with a lever switch spring 1. is adapted to be moved by the roller 7", and to cause the set of s 'itch springs s to be o-p erated.

A portion of a side of the telephone casing is illustrated at G, an escutcheon plate being mounted on the outside thereof, shown at e, and is secured through the walls of the casing to the frame f, by means of machine screws m, and m. The machine screw 972. has a flanged bushing-washer b secured the head of the screw m and the escutcheon plate 6. Pivoted loosely between the flanges of this bushing-washer and adapted to rotate on the same is the latch member L. These external parts, including perhaps more clearly understood by reference to the views at 2N, 2O and 2-P which shows a side View of these parts in the different operating positions.

Referring to these latter figures, I provide an inclined cam surface 0 for the latch which is engaged by the hook H. This construction involving such a cam surface is important, as by means of this and the provided construction of the cooperating parts, I am enabled to forcibly return the latch member L to normal position as illustrated at 2N from the ultimate position as illustrated at 2-P by means of the forcible propelling of the same by means of the under surface of the switchhook lever H engaging this cam surface. I thus do not depend upon the force of gravity alone as in prior constructions of such devices with which I am familiar, wherein dependence-is placed upon the gravity force overcoming the friction between the mobile part or parts and the stationary parts to which they are secured.

Furthermore, I do not clamp, constructions, the latch member to the casing or escutcheon plate of the machine screw on but provide a noncorrosive flanged metal bushing 2) upon which the latch member is pivoted loosely, the flanges preventing thescrew from binding'the latch member L as would otherwise as in prior L directly by means This lever switch spring occur and as does often occur in prior constructions above referred to.

Referring now to Figs. 2-A and 2-N these show the latch member, the switchhook and the circuit connections in normal or unoperated position. 111 Fig. 2A I show the receiver 5 restingupon the switchhook ll thereby causing contacts between the springs 1 and 2 to be made. The connection between the springs l and 3 will be broken, thereby causing the circuit connections between the line wires 7 and 8 to be discontinuous which will cause the signal apparatus, not shown, at the Central Oflice to indicate the non-busy condition of the line.

Now, if the subscriber desires to place the apparatus in conversational circuit with the central office equipment the receiver 5 will be removed from the switchhook lever H- causing the lever H to take the position indicated in Fig. 2-0, the latch member L. by its latching tongue 9, preventing the lever from rising any further at this time. The conversational circuit between the line wires 7 and 8 is now closed, the circuit cans ing this closing being traced as follows: From line wire 7 through the transmitter 10. contacts springs 3, l and 2, conductors l1 and 12, receiver 5, to the other line wire at 8. It will thus be seen that the primary winding 13 of the induction coil 14 is not in circuit and the secondary winding 15 of the induction coil is short-circuited and thus disabled by the closure of the contacts of the springs l and 2.

The circuit then briefly consists of the conducting wires, the transn'litter and the receiver in serial circuit with the line wires. This provides a circuit in which the transmission is not as efficient as that which will later be described but in which the sidetone effect is minimized producing an agreeable effect to the telephone user who presumably, when using this circuit, does not need the highest degree of transn'iission efliciency but is possibly using the line to converse with nearby stations in which such high degree of transmission is unnecessary.

uch conversational circuits wherein the stations are not far apart, exceed in number those in which the stations are far distant from each other and therefore. in a majority of cases, the circuit connections, as shown in Fig. 3-B and with the latch member in the position shown at 2-O will be used.

For long distance connections, however, where the parties are apart a distance one from the other, a more eflicient sub-station transmitting circuit is highly desirable. Such a circuit can be readily obtained by operating, manually, the latch member L, so that the switchhook lever H advances to its ultimate or extreme operating position and the latch taking the ultimate position as shown in Fig. 2-P. The circuits will then be as shown in Fig. l--C which shows the springs 1, 3 and 41 through their contacts making electrical connection one with the other, and breaking the circuit between the contacts of springs 1 and 2. Thus the short circuit is removed from the secondary winding 15 of the induction coil 14, and the primary winding 13 is connected in conversational circuit in series with the condenser 16, across transmitter 10. Under this condition the well known Booster sub station circuit is formed in which as is well known the outgoing transmission is quite powerful, this circuit being well known in the art, and it is not necessary to describe the same in detail. In this use of the Booster circuit the direct current receiver 5, is connected serially in the line wire 8.

Figs. 2D, 3E and 1-F show an embodiment of my invention wherein a magneto type receiver is used, and it is, there fore, not connected serially in the line as in the circuits just described, but is connected in series with the condenser 16, and the primary winding 13 of the induction coil 14. Fig. 2D show-s the circuit connection with the receiver 5 on the hook, and the circuit connection between the line wires 7 and 8- being disconnected on account of the open contacts of the switch springs 17 18 and 19.

, When the circuit is taken for use the subscriber removes the receiver 5 from the switchhook, and with the latch and hook members in the position shown in Fig. 2-0, the circuit connections are as illustrated in Fig. 3E. The switch springs 19 and 20 are un'operated, and through their contacts remain in connection one with the other. The switch springs 17 and 18 make connection through their contacts at this time, completing the circuit for the transmitter 10, between the line wires 7 and 8.

The circuit then briefly consists of a conducting wire leading from line wire 7 from the transmitter 10 through switchhook contacts of the springs 17 and 18, the winding 15 of the induction coil 14, which winding in this case is a primary winding, to the other line wire 8. The receiver 5 is connected in a local circuit consisting of a winding 13 of the induction coil, which winding in this case is a secondary winding, the condenser 16, the conducting wire 21, the switch spring 20, the switch spring 19, and the conducting wire leading back to the receiver 5. Thus, the circuit with the hookswitch latched as in Fig. 2O is that of an induction. coil circuit well known in art, having a local receiving circuit, and while fairly efficient for receiving, is not so efficient for outgoing transmission. The sidetone efiect is less than in. the form to be described which has a high efficiency for outgoing transmission as will later be discussed. The circuit just described, would just as in the case of the circuit shown in Fig. 3-B have a considerable use for local conversational. telephone circuits wherein powerful transmission is not an object, but wherein the side-tone effect is especially undesirable.

Now, should the subscriber desireto obtain the use of a circuit possessing the highest degree of outgoing transmission efficiency as for long distance connections, he will depress, manually, the latch member L to the 'iposition shown in 2-1, allowing as shown in this figure the hookswitch lever H toadvance .tOI its highest or ultimate position. Under this condition the circuit connecti-ons illustrated in Fig. 4F form the well known Booster circuit, and which is briefly described as follows :-In this circuit the winding 15 becomes a secondary winding, and the winding 13 primary winding of the induction coil 14:. a

The contacts of the springs 17, 18 and 19 making electrical connections one with the other cause the conversational circuits to be closed through these contacts. The receiver 5 is now shown serially connected with the condenser 16, and the primary Winding 13 across the transmitter 10. When the subscriber speaks into the transmitter, the' transmitter varying its resistance will vary the potential at its terminals and thereby vary the charge of the condenser 16, as well varying the line current directly. This effect causes a varying current to flow through the primary winding 13, which is repro duced in the winding 15 in the well known manner augmenting the effect of the varying current in the line above mentioned. This produces very powerful undulations of currents in the line wires causing the well known so-called Booster effect on outgoing transmission, but at the same time creating a very considerable undulating or varying current to flow through the receiver 5, producing a considerable side-tone effect in this receiver. For this reason this powerful transmission circuit would only be used for long distance connections, and would not be used in the majority of connections.

I have above described the various illustrated hook and latch positions and the circuits resulting therefrom, from the normal position to the ultimate position of the switchhook and latch. When the subscriber finishes the telephonic conversation, he will replace his receiver upon the hookswitch lever and cause it to descend. The bottom of the lever during its downward movement will come into an engagement with the cam surface 0 of the latch member, forcing the latch member forward, and its face portion downward until it is restored to its normal position as shown in Fig. 2N, from the ultimate position as shown in Fig. 2-1

I am aware that numerous and extensive departures can be made from the embodiments shown herein and described above. such embodiments being illustrated so that my invention can be more clearly understood, and not for the purpose of limiting the same.

What I claim is 1. In a telephone substation, telephone elements therefor, a plurality of circuits for said elements, one of said circuits being adaptable to produce high efliciency telephonic transmission, another circuit being adaptable to produce a less etlicient telephonic transmission, switch springs adapted by their movement to switch the telephone elements to either of said circuits, a lever member for said switch springs, a latch for said lever member, said latch controlling the position of said lever to cause the lever member to operate the switch springs to make proper connections for either of said circuits.

2. In a switchhook circuit, a switchhook,

a lever member therefor having a plurality of operative positions and a normal position. switch springs operated by said lever to make different electrical connections at each operative position said switch springs disengaged when in normal position, a latch to retain said switch lever in one of said operative positions, manually operated means integral with said latch to cause said lever to take a second operative position, a relatively low efficiency telephone circuit, a relatively high efiiciency telephone circuit, said low eliiciency circuit being formed by said first connections and said high efliciency circuit being formed by second connections.

In a telephone, a switchhook therefor, a booster circuit therefor, an anti-side tone circuit therefor, an automatically operated lever for said switchhook to connect said booster circuit to the line Wires of said telephone, or to connect said anti-side tone circuit to said line wires, said lever automatically operated to connect said anti-side tone circuit, and manually operated to connect said booster circuit.

4:. In a telephone substation instrument, a telephone receiver therefor, supporting means for the said telephone receiver,

spring means to move the said supporting neans when the said receiver is removed from the said supporting means, a plurality of sets of electrical contacts. means to cause one of the said sets of contacts to be operated by the moving of the said supporting iii-cans to connect in (Oil\tlfSliilUlEl!i circuit the transin'ssion cicnuni's of the said telephone according to a given manner of connections for outgoing and incoming tolephonic transmission, stop means to stop the said support in the said movement. at a point where it fails to operate the second set of contacts, the said step means being capable of manual operation to cause the said supporting 11192 as to continue its movement to a position wherein the second set of contacts are operated, operation of the second set of contacts ch ti o; the manner of connection the transmission elements of the said telephone to produce a different op crative transmission eiiect for incoming and transmission.

5. In a telephone substation instrument, a telephone receiver therefor, a telephone transmitter therefor. an induction coil and condenser with circuit conductors counccting the said receiver, transmitter, induction coil and condenser to connect the same in a given manner to produce a given effect for incoming and outgoing telephonic transmission, supporting means for the said telephone receiver, motor means to move the sa d supporting means when the said receirer is removed from the said supporting means, a plurality of sets of electrical con tacts in the said circuit conductors, means to cause one of the said sets of contacts to be operated by the moving of the said supporting means to connect in c mversatio1uil circuit the transmission elements of the said telephone according to the above manner of connections, and manually operated means to extend the movement of the said supporting means to cause the said second set of electrical contacts to be operated. the operation of the second set of contacts altering the circuit connections between the telephone elements to produce a different operative transmission effect between the said transmitter and the said receiver, and for incoming and outgoing transmission.

In witness whereof. I hereunto subscribe my name this 16th day of November, A. D

the

RAY H. MANSON.

Copies of this patent may be obtained for five cents each, by addiessing the Commissioner of Patents,

Washington, I). C.

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