US306361A - Individual-call instrument for telephones - Google Patents

Description

(No Model.)

2 sheets- -sheef; 1.

J. P. STABLER. V INDIVIDUAL CALL INSTRUMENT FOR TELEPHONES. No, 306,361.

Patented Oct. 7, 1884.

N PEYERS. Plxoiu-Lflhugmphcn Wash llgloll. D. c.

(No Model.) 2 Sheets-Sheet 2. J. P. STABLER.

INDIVIDUAL GALL INSTRUMENT FOR TE LEPHONES. No. 306,361. Patented 001197, 1884.

Fig-2.

TRAiIsMIT 'EER Invento N. PETERS. mmmm m. Wahinglon. 0.0.

rrrrn Frans a'rnnir rrrcn.

JAMES P. STABLER, OF SANDY SPRING, MARYLAND.

lNDlVlDUAL-CALL QNSTRUIVIENT FOR TELEPHONES SPECIFICATION forming part of Letters Patent No. 306,361, dated October 7, 1884. Application filed January 26, 1884. (No model.)

To aZZ whom it may concern.-

Be it known that I, J AM ES PLEASANTS STA- BLER, of Sandy Spring, Montgomery county, in the State of Maryland, have invented new and useful Improvements in Individual-Gall Apparatus for Telephone-Lines and I do hereby declare that the following is a full and accurate description of the same.

This improvement relates more particularly to the invention for which Letters Patent No. 265,454 were granted to me October 3, A. D. 1882; and it consists in the improvement in the push-and-pull pawl, in the escapement or detent for the ratchet-wheel actuated by said pawl in the electrical connections in the box, in the single-current commutator on the axis of the generator, whereby the current which drops the annunciator at the exchange is always in the same direction as the office-bell current of the central-office instrument, and

in the mode of holding magnets on the frame.

The general structure and operation of the instrument shown herein being fully described in my said patent, and now well known, it will only be necessary herein to describe in detail those portions which form the subject of the present improvement.

Figure l is a perspective View, my call-box open, the electrical connecting-wires being omitted. Fig. 2 is a plan of the same with all the electrical connections. Fig. 3 is a perspective view of the armature-pinion and single-current cOntactspring.

For convenience I will describe the parts improved in the order named above. In my said patent the msh-andpull pawls to actuate the ratchet S and index L are constituted of two arms coincidently .jointcd to the end of the arm G, carried by the armature B, and drawn together by a spring, the ends of which are attached to the pawls, respectively. This mode of construction requires the making and handling of five separate pieces, and considerable labor, 8:0. I now dispense with the separate pivoted arms and substitute a pair of pawls made from a single strip or ribbon of steel, as at D, bent at the middle to form an eye, b, capable of embracing the body of the screw 0, or, preferably, the perforated bushing I), to which the eye 6 may be fastened by solder or otherwise, if required. The screw 0 then passes through the perforation in the bushing, and thereby pivots the pawls upon the arm 0. The end f is finished plain to push upon the teeth of the ratchet, while the end g is turned around inward to form a hook and pull upon the teeth of the ratchet. The elasticity of the ribbon D affords all the attention required to keep both pawls in their duty. In my said patent I have described the necessity of an escapement to positively arrest the ratchet and index switch when the pawl movement ceases. The ratchet, &c., shown in the patent has reference to the 10- cal-station instrument wherein in each instrument there are but two points where such arrest is required; but in the central-office instrument the same arrest is required for each pawl movement; otherwise the indexswitch of the central-ofiice instrument may by momentum move too far and make contact with the key-stops too soon, thus cutting out the line before the local switch has reached its bell-shunt. Under these circumstances the proper hell would not be rung; but at the central oflice there would not be any indication of that fact. It was contemplated to employ with the central office a ratehet-wheel having an escapement pin for each local station on the line, so that my escapement would arrest at each movement. This involves a great deal of trouble in adjustment, and I have substituted for the cscapement arms and pins a pair of rigid arms l?) E, carried by the arm 0, and having their ends located near the edges of the ratchet in close proximity thereto on opposite sides and about midway between the points of contact of the pawls measuring around the circumference of the ratchet-wheel. These arms vibrate with the arm C and upon the same center. At the close of each reeiprocation of the pawls and advance of the ratchet one or the other of said arms E is in close contiguity to the inclined face of the ratchettooth and ready to arrest th same if momcn- 9 tum shall cause any continuance of motion. Thus a perfect escapement arrestprovided without any of the delicate adjustments required where a series of pins shall be used, because the ratchet-teeth. are closely dupli- 5 out is to ground, and the line in is cates, and when the arms E are ad j nsted to one pair of said teeth the adjustment will be sufficient for all. g

The change in electrical connection from that shown in Patent No. 265,454 may be indicated as follows: In said patent, when the index is on the bell-shunt and thelever down, the current is through said shunt, but does not enter the lever at all. It goes to a switchspring controlled by said lever, and on one side said spring makes connection with the telephone and line, and on the other side it makes connection with the belland line, and one or theother of these connections is made according as the lever is up or down. In the present improvement I dispense with the side con tacts and arrange the switch-spring to break contact with the lever when down and make contact therewith when it is up, and connect the bell on one side with said spring and on the other with the lever, whereby when the lever is down the bell will be in circuit,

and when the lever is up the bell will be cut from the central office. For convenience also, the electrical connections will be separately traced under the several conditions in which they may be 'in the use of the instrument. lVhen the station is called by the operator at the central office, the telephone being on the hooks at the station. \V hen the index-switch Lis traveling to the local shuntof the station (S) to be called, supposing it starts from the unison shunt Z, the current will first pass over the following line, to wit: line in post h, to motor-magnets A A, to indexswitch L, to detent-shunt Z, to detent Q, detent-magnets R, wire 1, to hook lever j, to spring 70, wire 2, to button Z by spring on, to frame of station-generator V, wire 3, to lineout post a. When the index-switch L passes from the detent-shunt Z tothe dial-rim a, thecurrent goes by way of said rim and wire 24: to the line-out post a direct. XVhcn theindexswitch L passes on to the local station or beltshunt s, the current then passes by means of said shunt and wire 7' to hinge t, wire 8, to bell-magnet T, wire 9, to hinge u, and to hooklever j, to contact-spring k, wire 2, to button Z, by push button spring m, to frame of local generator V and wire 3, to line out post 42. The bell-magnet T, then being in circuit, the bell is caused to ring bya current of adequate strength. The call being heard, the telephone is taken down and, the circuit will then be as follows: Post It to motor-magnets A A, to indeX-switch L, to stationshunt s,wire 7, to contact-spring 00, along lever j, to spring (1 by wire 4, to the secondary coil XV of the transmitter by wire 5, to post 1, wire 6, to telephonewire 2, to button Z, spring m, frame of generator V, and wire 3, to line out post it. This circuit remains until the communication or conversation is terminated, when the central office is notified of that fact by ringing off, the telephone being first replaced upon the hook and the push-button 0 being pushed in to break contact with the button Z. of the local generator V being normally in connection with the out postn, ,a pin, 2, on the armaturepinion 1) makes cont-act at each revolution with the spring 2, which is in connection by wire 23 with the button I, and thence by way of contact spring 1) with the opposite terminal of the armature-coil, so that during each revolution of the armature one current will be shortcircuited through the generator by way of pin .2, button Z, and spring 1), and the other current will go to the line. The pin a is so located that the current which goes to the line will be in the same direction as the re-enforce current from the central office. While ringing off, the currents to the line will be, generator frame V to out post 02, and from spring 1) by wire 2 to contact-spring 7G, to lever j by wire 9, to hinge a, and to bellmagnets T, wire 8, to hinge 7., wire 7, to local shunts, index-switch L, motor-magnets A A, post h, line to central oflice.

IVhen it is desired to call up the central oflice, the telephone is upon the hook, and the switch upon the detent or unison shunt z. The push-button 0 is pushed in to break contact with button Z. WVhen the crank is turned, the current will then be, generator-frame to out post a, and from springs 19 by wire 2 to contact-spring 7c, lever j, and wire 1, to detentmagnet It, index-switch L, motor-magnets A A, and post h, to line. Vhen call is answered, take the telephone from the hook and the currents will be, generator-frame by wire 3, to post a and spring 1), and wire 2 to telephone-wires (3 and 5, to secondary coil of the transmitter-wire 4, to contact-spring q, lever j, wire 1, detent-magnets R, indexswitch L, motor-magnets A A, and post h to line. This completes the several connections under the various conditions of use. The primary coil U of the inductorium is in the short local circuit of the battery X, as is usual.

Ithas been found necessary to fix the motor-magnets very firmly in position with refi erence to the polarized armature, so as to secure the exact movement of the latter necessary to operate the push-and-pull pawl and ratchet of the index-switch. I therefore provide the three-ar1ned clamp-plate Z, two arms of which engage the spool ends, and'the other engagestheyokey. Ascrew,s,passesthrough said clamp, between the magnets and into the frame G, so as to bind the spools firmly against said frame, which is also provided with seats prepared to receive and engage the spool ends.

As an additional precaution against the shifting of themagnets from rough handling, shipment, or other accidental concussion, a pin, 0, is passed through a hole in the frame into the spool end.

The frame Having described my invention, I claim- 1. The push-and-pull pawl made from a single strip or ribbon of spring tempered steel or equivalent meta], bent at its middle to form an eye, I), and the ends f g, finished as described, and for the purpose set forth.

2. The push-and-pull pawl made from a single strip or ribbon, l), of spring tempered steel or equivalent metal, bent at its middle to form an eye, I), combined with the perforated bushing 1), permanently fastened therein, the arm 0 of the vibrating armature B, and the ratchet S of the index-switeh L.

3. The push-and-pull pawl l), the revolving ratchet S, and vibrating arm 0, whereby said pawl is actuated, combined with the escapeinent-arms 10 E, permanently attached to and carried by said arm 0, and adjusted to approach and stop close to but not in engagement with the edge of the ratchet, as and for the purpose set forth.

4. A rotating ratchet, S, and yibrating arm 0, combined with a push-and-pull pawl, D, both attached tosaid arm at the same distance from its center of motion, and escapementarms E E, both pawl and escapeinent being carried by said arm, but arranged to approach and-engage the edge of the ratchet from directions respectively perpendicular to each other.

5. A rotating ratchet and avibrating arm, 0,

combined with escapeinent-arms E E, rigidly attached to and vibrating with said arm upon its center of motion, and an elastic push-andpull pawl, D, carried by said arm and pivoted thereto at a point ninety degrees with reference to the axis of the ratchet from the escapement-arins axis of motion.

6. In an individual call-instrument for telephone-lines, the telephone hook-lever j, con tact-springs x q, and their electrical connections, in combination with the contact-spring 7., whereby when said lever is down contact is made with said lever, and the currents shortcircuited to cut out the transmitter and telephone, as described.

7. The spring z, arranged to make singlecurrent contacts with the pin a on the revolving spindle of the armature, for convenience, say, on one side of the generator, and placed in electrical connection with the armature on the other side of the generator, whereby the alternate currents are short-circuited through the generator and currents in the same direction as central-office bell-current are 'sent to the line only.

JAMES P. STABLER.

Vi tnesses:

R. D. 0. SMITH, J. O. TURNER.

Images