US1003430A - Switch. - Google Patents

Description

R. (LAWYER & J: D. GATTISQ SWITCH. APPLIUATION FILED JAN. 14, 1911.

Patented Sept. 19, 1911.

BWE WJMH HOS-(30E GAVJYER AND JAMES I). UATTIS, 1'.C[ERGU1R.Y,

matters 121 tent.

Serial No. 602

S'WITCH.

" ation of Specizc ipu'iiuatiozl fileii January 1 1111' Fri.

post 21 to Which the bell circuit wire B is connected. The binding post 21 to which the telephone circuit wire T is connected is also Wired to the binding posts '16 and 17 g as indicated at 0, respectively, while wires (1, (Z connect the binding posts 21 with the posts-16 and 17 respectively. The bind ing post 16 is connected by means of the circuit wire 0 with the contact member 12 and the binding post 17* is connected by means of a wire 6 with the contact member 11. Awire f connects the binding post 16 to the, contact member 11 and a wire f also connects the binding post 1.7 to the contact connected in. the bell circuit only. Therefore it will be seen that when the switch blade is depressed in the above manner, the tclcpl'ione circuit is broken through the contact members 11, 12 and 13 and the switch blade. The connection is made between the subscribers telephone line 'l and the party line Vi through the wire 0 which connects the binding post 521 and the binding post 16, from whence the current is conducted by the Switchblade 6 through binding pest 1.6, wire f, binding post 11, and wire a to the binding post 20 to which the wire i is connected. The line W" is thus disconnected from the talking circuit of the telephone but is connected in the bell circuit through binding post 21, Wire 0?, binding post 16, conducting wire 19, binding post 16, wire 6, binding post 12 and wire a. It will be obvious that all. parties on the wire W are disconnected from the talking circuit so that the conversation carried on between the subscriber and the party calling over the line W cannot be overheard. The line lV may be connected in the telephone circuit While the line I is only included in the bell circuit by simply reversing the above operation and depressing the button 7 at the right hand end of the switch blade.

From the-foregoing it is thought that the construction and operation of our improved telephone switch will be readily understood.

The device is comparatively simple in construction and eavesdropping upon telephonic conversation carried on over party telephone lines is rendered absolutely impossible. Such a switch is of great couvenience in telephone lines of this character which are widely used 1n rural communities.

Such a switch may be constructed at a nominal cost and readily installed in telephone systems of the present construction. lt may also be easily and quickly operated and is highly eflicientand reliable in practical use.

While we have shown and described the preferred construction and arrangement of the various parts, it will be understood that the device is susceptible of considerablemodification without departing from the essential feature or sacrificing any of the advantages thereof.

Having thus described the invention what is claimed is 1. In a switch of the chara ctcr described, the combination with a party line telephone circuit including a main line circuit and a bell circuit, of a. spring held dcpressible switch blade, contacts normally engaged by said switch blade to close the bell. circuit, contacts arranged in each of said circuits, and means carried by,thc switch blade to engage certain of said. contacts and maintain the bell circuit closed, said switch blade ongagii'ig other of the contacts to close the telephone circuit through. the party line.

2. In a switch of the clmraclcr described, a telephone circuit including a party circuit. having two line wires and a bell circuit, in c mibination with a switch comprising contact members each wired to one of the party line wires, a. contact member wired to the bell circuit, binding, posts wired to the first named contacts and to the local telephone line, a movable SWll'.Cl'l blade, a. spring yicldingly holding said blade in mi 'auenunt with the contacts to normally close the bell circuit through the party lines-1, two series of contacts each wired. to the bell. and line circuits, and m ans arranged upon each end of the switch blade whereby when the end of said blade depressed the talking circuit is connected through one of the party line wires and the bell circuit through the other party line wire.

3'. In a switch of the character described, a telephone circuit including a party talking circuit having two line wires and a, bell circuit, contacts wired to the party line, a contact wired to the bell circuit, a switch blade provided with a central longitudinal slot. a post extending through said slot, a spring on said post bearing against the blade and normally holding the same in engagement with the contacts to close the bell circuit through the. party lines, a series of binding posts arranged beneath each end of the switch blade, said post being wired to the party line and bell circuits, a bridge member of insulating material I end oi the switch blade, an electrical conductor fixed to said bridge member for engagement with certain of the binding posts, whereby upon th'elldepression of thd switch arranged on each blade at one en'd' e talking circuit is connected through one of the line wires by the our signatures in the presence of two witengagement of the switch blade with certain nesses.

of the contacts, and the bell circuit is con- ROSCOE CAWYER.

nccted through the other of the line Wires by JAMES D. GATTIS. 5 the engagement of the conductor With t-he Wit s remaining contacts. HAM. E. MCBRIDE,

In testimony whereof We hereunto affix EVERETT O. ROBERTSON.

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