US262490A

US262490A - Door-alarm

Info

Publication number: US262490A
Authority: US
Publication date: 1882-08-08
Anticipated expiration: 1899-08-08

Description

(Model.)

(L A. SMITH.

DGOR ALARM.

Patented Aug. 8,1882

PTENJF CHARLES A. SMITH, OF Sl. LOUIS, MISSOURIJ DOOR -ALARM.

SPECIFICATION forming part of Letters Patent No. 262,490, dated August 8, 1882.

Application filed June 9, 1882.

T0 all whom it may concern:

Be it known that I, CHARLES A. SMITH, of the city of St. Louis, in the State of Missouri, have in"ented a oertain new and nseful Im provement in Door-Alarms, of whieh the following is a full, olear, and exact description, referenoe being had to theacoompanyingdrawings, forming part of this specifioation, and in whioh- Figure 1 is an end view; Fig. and Fig. 3 a front view.

My invention relates to an alarm operated on by a sliding bolt wbrked by eitl1er a knob or key.

A represents part of a door, and B the front wall of the frame, to Whioh is attaohed the keeper 0 for reeeiving the end of the slid ing bolt.

D is a plate seoured io the inside of the door, to whiol1 the bell and its parts are attaohed.

E is the sliding bolt, secured to the plate I) by straps F, whioh allow it to have ree end movement.

G is a transverse pin passing through the bolt, its ends protruding to engage with the front strap, F, to limit the forward movement of the bolt under the influenoe of a spring, H, which surrounds a post, I, and its ends bearing respeotively against the pin G and a stud, J. Thus the normal position of the bolt is in engagement With the keeper C.

K is the bell or gong, oonneoted to the plate D by a post, L, and nut M.

N is a hammer, with a stem, 0, which surronnds a post, P.

Q is a short bar or pin passing transversely throngh the bolt E, and having pivoted to its 2, a side view,

lower end a swinging aam, R. When the bolt E is foroed back the lower corner of this cam R comes against the upturned end of the stem Othe upper corner of the oan1 ooming against the lower edge of the bolt, as shown, so that the oam will not swing baokwardwhioh will foroe the hammer away from the edge of the bell. Tl1en When the end of the stem slips off the cam the hammer will be drawn back by a spring, S, and strike the edge of the bell, giving an alarm. The backward movement of the hammer is limited by (Modol.)

| a pin, T. Then When the bolt is released it will move forward under the influenoe of the spring H, the lower end of the oam R swing forward, and, passing over the end of the stem 0, the bell will agan be rung by a hammer, U, seoured to the back end of the bolt E. The bolt aan De operated either by the door-knob or bya key, and, if desired, the knob aan be looked and the bolt operated by thekey alone.

V is a tumbler, which is on and is turned by the shank of the knob V. On this tumbler are pins V V which, as the knob is turned, come in contact with a pin or stad, E, on the top of the bolt E, moving the bolt endwise, disengaging it from the keeper 0, and operating the hammer N. When the hammerN has been operated the bolt will have been disengaged from the keeper, but the pin V or V will not have left the pin E, so that then is the proper time for the door to be opened; but one who is not acenstomed to the devioeas a burglar, for instanoewould naturally turn the knob until the pin V is disengaged from the pin E, and then the bolt will be moved i'orward and engaged with the keeper agan before the door aan be opened, operating the hammer U, whiel1 has the funotion of giving a second alarm When the door is opened and the knob released, or When the knob has been turned too farby one not accustomed to the device.

The knob aan he locked from turning by throwing over a plate, W, whioh would engage with one of the pins V V. When the knob is tl1ns looked, or at any other time, the bolt may be operated by a key, X, whioh oomes against the upper end of the pin Q. The key-hole is plaoed forward of the pin Q, so that the key has a long hearing upon the p1n.

Electrcity may be used and the alarm turned into a jingle-bell by means of an arm, Y, on the end of the bolt E, and an arm, Z, supported by a post, Z. 'lhus When the bolt is moved back the arms would oome together, conneoting theoironitandvibrating the arm U.

I claim as my invention-- 1. The combination of sliding bolt E, pin G, spring H, bar Q, swinging oam R, ham- IOO nier N O, spring S, be1l K, and suitable knob. made substantiaily as and for the pnrpose set 01 key for operating the bolt, as set orth. forth.

2. The combination of knob V, tumbler V,

with pins V W, sliding bolt E, secnred t0 GHARLEb bMITH' 5 the plate F and h2wing pin 01 stnd E han1- Witnesses:

mer U, bar Q, cmn R, pin G, keeper 0, Spring SAML. KN1GHT,

H, hammer N 0, spring S, and bell K, 2111 GEO. II. KNIGH'I.