US555645A

US555645A - Iieinrich hempel

Info

Publication number: US555645A
Authority: US
Publication date: 1896-03-03
Anticipated expiration: 1913-03-03

Description

- (No Model.)

Winer Z/Z 15w.

Patented Mar. 3, 1896.

UNITED p STATES PATENT OFFICE.

HEINRICH HEMPEL, OF BERLIN, GERMANY.

TELEPHONE-CALL REGISTER.

SPECIFICATION forming part of Letters Patent No. 555,645, dated March 3, 1896. Application filed April 9, 1895. Serial No. 545,070. (No model.)

To all whom it may concern.-

Be it known that I, HEINRICH HEMPEL, a resident of Berlin, in the Kingdom of Prussia, German Empire, have invented certain new and useful Improvements in Apparatus for Indicating or Recording Telephonic Connections, of which the following is declared to be a full, clear, and exact description. 7

The object of the present invention is to provide an arrangement by means of which control or indication of use of the telephone by subscribers is obtained so far as the subscriber is concerned, while the use of it on the part of the summoned subscriber is not controlled. By this means the telephone management receives indication of the amount of conversation led to by the summoning subscriber.

In Figure 1 of the drawings the apparatus is represented in front view in position on a telephone with ringing-crank. Fig. 2 shows the internal viewof the telephone seen from behind, and Fig. 3 is a detail view.

On the front wall 4) of the telephone and near the ringing-crank is there is fitted a counting mechanism ,2, the one illustrated consisting of four dials, which specify units, tens, hundreds, and thousands and allows of reckoning up to ten thousand; but any other indicating contrivance may be used. A bar 1 is furnished with a pointed head which enters notches e in a star-wheel w. This starwheel w is fixed on the ringing-crank axle q. A pin a on the bar r enters through a slot in the wall 0 to the interior of the telephone and works a forked lever-arm h, which is pivoted at 'L' on the inside of the wall 0). This leverarm carries a pin 8. The lever-arm m of the hook f is shown in Fig. 2 in contact with the telephone-line-circuit terminal, which occurs when the receiver is lifted from the movable hook f; but in its normal position the leverarm m is in contact with the bell-circuit terminal.

In order to be able to turn the crank for the purpose of calling attention after taking down the receiver the summoning subscriber is first of all obliged to pull down the bolt 0", the finger-piece 0 being provided for this purpose, whereupon the pointed head 19 of the bolt 0* comes out of the notch e of the starwheel w. At the same time a pin 3 on the bar r acts on a fork g in connection with the indicating mechanism and the pin 8' on the lever h is drawn into contact with the leverarm m. The crank can now be turned as often as is necessary in order, first of all, to call the exchange and then the desired subscriber.

After finishing a conversation with a subscriber the disconnection-signal is given by a further turning of the crank it, and thereafter the receiver is again hung upon its hook f, through the weight of which the lever-arm m is brought into contact with the pin 0. On the rising of the lever-arm m the pin 8 is moved upward, and with it the lever h, and as the latter is in connection with the pin a the bolt 7' is pushed into its highest position, as indicated at Fig. 1. Turning of the crank It is thereafter prevented until the bolt 1' is again pressed into its lowest position. On the rising of the bolt 7' the fork g is moved upward by the pin 8 and there is occasioned by this movement a unit movement of the counting mechanism a. The counting mechanism can also be so arranged that the indication takes place on pushing down the bolt and on the upward movement of the latter no movement of the counting mechanism occurs.

As the indication on the dial of the countin g mechanism only follows on the movement of the bolt 7", and as the subscriber summoned does not require to turn the crank and so has no need to move the bolt 1, the conversation is only registered on the telephone of the summoning subscriber.

-The spring-tension of the counting mechanism is so adjusted that the weight of the receiver when hung upon its hook f presses down the movable hook and at the same time carries upward the bolt 1", whereupon the pin 8 on it acts on the fork g of the counting mechanism to efiect the registration of connection.

In order to call attention the bolt 'r must be moved, and in order after finishing a conversation to oifer the possibility of being called the receiver must be hung into the movable hook f, by whose weight the bolt 7' is pressed up into its normal position. In this way a sure indication of the use of the telephone is provided.

The arrangement represented in Fig. 1 may be surrounded by a case, out of which pro ject only the ringing-crank, the call-key and the lower part of the bolt 4'. The dial of the indicator may be covered with glass and be left visible.

Having thus described the invention, What I claim as new, and desire to secure by Letters Patent, is-

A conversationindicator for telephones, characterized by a bolt the pointed head of which in its highest position engages with a star-Wheel secured on the ringing-crank axle, and the pin on the belt of which is so connectcd with counting mechanism that either the upward or downward movement of the bolt 0' effects a unit movement of the counting mechanism in such a Way as to indicate the number of connections made for the purpose of conversation, while a pin likewise fastened onto the bolt is so connected with a lever-arm and pin that on pressing down the bolt the pin rests upon the second lever-arm and on the upward movement of this leverarm induced by the hanging of the receiver, the other lever'arm and with it the bolt is pressed up, and by this means the further turning of the crank is prevented substantially as described.

HEINRICH HEMPEL. \Vitnesses:

WM. HAUPT, CHAS. KRi'JGER.