US1421091A - Doorbell and burglar alarm - Google Patents

Description

G. LATCHEM.

DOORBELIL AND BURGLAR ALARM.

APPLICATION FlLED-DEC.23, 1921.

Patented June 27, 1922.

2 SHEETS-SHEET G.LATCHEM. vDOORBELL AND BURGLAR ALARM.

APPLICATION FILED DEC.23, 1921.

Patented June 27, 1922.

2 SHEETSSHEET 2.

6 Norway,

GEORGE LATCHEI/E, ,OE MARKED TIRIEE, ARKANSAS.

. noolterinr AND {sc ema ALARM.

Specificationof Letters Patent. p te m gi 1922 Application filed December 23, 1921. Serial No; 524,484.

. T all whom 'vlt'may concern:

Be it known that I, Gnoneu. ,LArroHnM, ;a' citizen of the United States, residing at Marked Tree, in the county of Poin'sett and State of Arkansas, have invented a new and useful Doorbell and Burglar Alarm, of which the following is a specification.

This invention aims to provide a device which may be usedeit-her as a door hell or as a burglar :alarm, and the invention aims, especially, toprovide {novel means (for operating and controllin'grthe movement of the striker.

It is within "the province of the disclosure to improve generally and to enhance {the utility of devices of that type to which the invention appertains.

Zithzthe above and other 1 obj eots in view, which will appear as the description ;proceeds, the invention resides in :the combination and arrangement of parts and in the details of construction hereinafter described and claimed, ittbe'ing understood that, with in the scopeof what .is claimed, .changes in the precise embodiment of the invention shown can be made Without departingfrom the spirit of the invention.

In the accompanying drawings;

Figure 1 shows-.inrelevation, a device-constructed in accordance with the invention; Figure '2 is a vertical sectional view .wherein many parts appear in elevation; Figure 3 is a section, the view being inthe nature of an elevation Whereinparts are :removed;

Figure 4: is a section on the line l-4: of Figure 8; Figure 5 is a section :OIlithG iline 55 of Figure 3; and Figure 6 is:an elevation showing the means .whereby the plunger or operating member is mounted and. controlled.

The numeral 21 marks a support, which may bea door, a door frame or anything of the sort, provided with an opening 2,

which, preferably, is in the .formota ,restricted slot as shown in zEigure '6. The numeral 5 denotes a fran1e, -tl1e itrame being a composite structure, and including a base plate :3 secured at 14: to the support 1.

The'base plate 3'hasan opening registering with theopening 2 inthe support 1. [A

back plate 6 is attached to the base plateS and is disposed parallel toa front plate .7,

the backplate'6having posts 8 whereonthe front plate 7 is mounted removably, .as

A winding shaft 10 is journaled iforirotation in the franie 5 and isprovided with a squared forward :end 11 adapted for the reception of a wrench .or'key. vAgearwheel 12 .is loose on the winding shaftnO. A pgtchet wheel 141s fiXedto the winding shaft wheel 14 and is pivoted to the gear wheel 12, the gearwheel carrying. a spring. 16-

which, cooperating with the .pawl 15,, constrarns the pawl itO lcoact w ith the ratchet A pawl 15 cooperates with the ratchet w el 1&- 1 61 11 1 8 33 11.7 d sign-ates a coiled d iving spring; one end of which is attachedto one ofthe posts 8,:theqother end of the drivingfl spring:beinggconnected to the'winding shaft 10. The pawland ratchet mechanism =ll l5rforms' a connection between 13116 gear wheel l2q and :the shaft 310;, whereby thegshaft 10 may be'rotated, to ;put the spring 17 under tension, without rotating the gear wheel 12, the -foregoing being a common cloclcdetail, not worthy of specific delineation or extended description.

The gear wheel :12 m shes into a lan rn pinion 18 secured to a second shaft 19 journaled in the frame ,5, theshaft 19.ca1n-,ying a :sto wheel 20 having oppositely disposed long teethi2l and any desired nu nber 0t .interme ia e shert [teeth 2 st king wheel 23 is securedrto the-second shaft. 19 and cooperates wit a finger 24 on a shaf 25 :mounted :to rock in theftranie .5, zthe shagft 25 carrying 1a striker 26 adapted gto vcoact with an audible signal, such as a bell 27, carried by a E'brac'ket -28 secured ,ajt -30 to theback plate 6.-

fllhe device inoludesa spring ;latcl1:29 secured at 81, at its upperiend, to the back plate 6 and provided at its lower end with afoot-32. A notch :is formedin the foot.32, and, as shown in Figure 5, the notch produces, in the ,foot, a shoulder 33 and a shoulder 3.4L, theshoulder 34 -,project;ing beyondtheshoulder 33.

A {lever or adjusting member .35.;isdu1- crumed intermediate ,its ends,,-.as shown at 36, on the ,basepjlate; 3 and is supplied-at one end with aw Wedge-shapedhead 37 adaptedito enter behind the spring latch 29,,{the latch 29 .beingsprung away from the base plate 3 (Figure 2) more or less, depending on the amountthat the head37 .is introduced behind the latch. ,At its lowerend, the lever the device is to-be used'as a;b-urglar-alarm,

a flexible element 39, or other connection,

(Figure 1) may be attached to the finger piece 38. The operation of the part 39 will be explained hereinafter, since it is a more or less incidental feature.

The numeral 40 marks an operating member, in the form of a plunger, mounted for longitudinal reciprocation in the opening 2 of the support 1 and in the opening 60 of the base plate 3. The openings 60 and 2 are large enough so that the plunger 40 may have a transverse movement, as well as a longitudinal movement. The inner end of the plunger 40 is adapted tocooperate with the foot 32 of the spring latch 29, to spring the latch outwardly, away from the base plate (compare Figures 2 and 5). Adjacent to its inner end, the plunger 40 has an inclined surface 41.

A disk 42 is-secured at 62 to the outer surface of the support 1 and has an enlarged opening 43 shown in Figure 6, the outer end of the plunger or operating member 40 passing through this opening. A spring arm 44 is connected by a securing element 45 to the support 1, the disk 42 having a notch 46 giving access to the securing element. The spring arm 44 extends beneath the plunger 40 and holds the plunger up, in the position shown in Figure 2 for longitudinal sliding movement, in contact with the support 1, at the upper edge of the opening 2. The spring arm 44, however, is adapted to yield, to permit the plunger 40 to move transversely and downwardly, under conditions which will be set forth hereinafter. Adjacent to its outer end, the plunger 40 is connected at 47 to a spiral spring 48 attached at 49 to the disk 42, the spring and the disk being located within a shell 50 mounted at 51 on the support 1. A push button 52 is mounted to slide in the shell 50 and engages the outer end of the plunger 40, the push button having a flange 53, which, cooperating with the shell 50, limits the outward movement of the push button under the action of the spring 48 on the plunger 40.

The spring 17 imparts rotation to the winding shaft 10, the shaft 10 driving the shaft 19 by way of the gear wheel 12 and the lantern pinion 13. When the shaft 19 is rotated, the striking wheel 23, coacting with the finger 24 on the shaft 25, imparts oscillating movement to the shaft 25, the striker 26 moving into and out of engagement with the bell or signal 27 in a way which will be understood readily by those skilled in the art.

When the button 52 is pressed inwardly, the spring 48 is compressed, and the plunger 40 moves inwardly. The plunger 40 moving inwardly, engages the foot 32 of the spring latch 29 and moves the spring latch out of engagement with the stop wheel 20 whereby permitting the mechanism to operate. After the plunger 40 has been advanced a. predetermined amount, the inner end of the plunger slips off the foot 32 of the latch 29, and, thereafter, the latch 29 springs to the left (Figure 2) into engagement with the stop wheel 20, the mechanism being brought to a stand still, and it being impossible for the bell 27 to continue to ring, even though the operator may hold his finger on the button 52. When pressure on the button 52 is relieved, the button and the plunger 40 move outwardly, under the action of the spring 48. Owing to the fact that the plunger 40 is beveled as shown at 41, the latch 29 may spring to the left (Figure 2) as aforesaid and engage with the stop wheel 20.

There are three possible ways in which the device may be operated. First, it ma be caused to operate continuously, that is, the bell 27 may be permitted to sound until the spring 16 is in a neutral position. Secondly, a relatively long ring, but not a continuous ring may be produced. Third, a short ring, perhaps not more than a single tap may result. If head 37 of the lever 35 be introduced but a little way behind the latch 29, any of the teeth 21 or 22 of the latch 29 will be engaged by the shoulder 34 on the foot 32 of the latch 29, then the inner end of the plunger slips off the foot 32, and then the latch 29 swings to the left (Figure 2) as hereinbefore explained. If the head 37 of the lever 35 is introduced still further beneath the latch 29, then, the shoulder 34 will cooperate with the long teeth 21 of the stop wheel 20 and the wheel 20 will be permitted to make a half revolution, a longer ring resulting than is produced when the shoulder 33 is permitted to engage any of the teeth 21 or 22 of the stop wheel 20. Finally, the head 37 of the lever 35 may be introduced so far behind the latch 29 as to hold both of the shoulders 34 and 33 out of the path of the teeth 2122 on the stop wheel 20, whereupon the bell 27 will sound continuously until the spring 17 has run down. This last 110 operation results only when the lever 35 is operated by the flexible element or connection 39. The connection 39 is adapted to be attached to a remote door, a window or the like, and it is obvious that when the door 115 or window is opened, the bell 27 will sound continuously, the device thus being used as a burglar alarm.

Having thus described the invention, what is claimed is:

1. In a device of the class described, a striker; a driving train operating the striker and including a stop wheel; a latch cooperating with the stop wheel; a movable adjusting member under the control of an operator 125 and cooperating with the latch to vary the position of the latch with respect to the stop wheel; and means under the control of an operator for disengaging the latch from the stop wheel. 3

2. In a device of the class described, a of an operator for disengaging the latch striker; a driving train operating the striker and including a stop wheel having long teeth and short teeth; a latch having a'shoulder adapted to cooperate with the long teeth and provided with a shoulder adapted to cooperate with all of the teeth; an adjusting member coacting with the latch to dispose either of the shoulders in operative relation to the proper teeth of the stop wheel; and means under the control of an operator for disengaging the latch from the stop wheel.

3. In a device of the class described, a striker; a driving train operating the striker and including a stop wheel having long teeth and short teeth; a latch having a shoulder adapted to cooperate with the long teeth and provided with a shoulder adapted to cooperate with all of the teeth; an adjusting member coacting with the latch to position either shoulder for engagement with the proper teeth, and coacting with the latch to hold the latch completely out of engagement with the stop wheel; and means under the control from the stop wheel.

42. In a device of the class described, a striker; a driving train operating the striker and including a stop wheel; a latch cooperating with the stop wheel; an adjusting member coacting with the latch to vary the position of the latch with respect to the stop wheel; a plunger engaging the latch; and

means for mounting the plunger for longitudinal movement, whereby the plunger will disengage the latch from the stop wheel, and for mounting the plunger for transverse movement, whereby the latch will slip ofl the plunger, after the plunger has been advanced a predetermined amount.

In testimony that I claim the foregoing as my own,I have hereto afiixed my signature in the presence of two witnesses.

GEORGE LATCHEM.

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