US1629312A - Burglar alarm - Google Patents

Description

May 17, 1927. 1,629,312

A RUMRICH BUGLAR ALARM' Filed Aug. 5, 1926 VIM/fw @Wamego ALJ/Jaaa by the accompanying drawing.

Patented May 17, 1927.Y

entre arras are, erica..

ALFONS RUMRCH, OF PITTSBURGH, PENNSYLVANTA.

BURGLAR ALARM. I

Application filed August 5,1926. Serial No. 127,412.

This .projecting portion of the backV plate 9 .is formed with an opening 12, and a stud 13 passes loosely through this opening and projects forwardlyfrom the .plate 9. In the present showing, the stud'13 isprovided with a screw threaded portion 11i which is threadedr into a small board'orvthe like 15, the latter being secured by screws Vor ot-her desired means l to a portion of the door Vframe-17.

A spring-actuatedalarm` mechanism 18 fis `suitably mounted upon thefront side of the back plate 9, the spring ofsaid mechanism 'being indicated at .19 and its `winding key at .2.03.y This mechanism .includes a, suitable escapement 21 for operating. aclapper 22, the latter preferably co-acting with twojbells 23 mounted on'. the plate 9. Any suitable deV The invention aims to provide a new and improved device which maybe made to effectively sound an alarm, if an attemptis made to Open a. door or' window which is equipped with the device. Y .y

A further object is to provide novel means whereby the alarm fmay be made to sound only while an attempt is being made to open the door or window equipped with it, or may be set in operation by such attempted forcing land will continue to ring until' reset. by a person within the building.

A still further ob 'ect is to provide an alarm device designed primarily for yuse in connection with doors and of such construction that it willvbe sounded either by turning the door knob or by exerting pressure upon the door, attempting to force it open or attempting to .drill theisame for the purpose of releasing itslock.

Vith the foregoing and minor objects in view, the invention resides in the novel subject matter hereinaftery Vdescribed `rand claimed, the description being supplemented 22 against.operationwhenever desired, and the shaft 25 upon which this vclapper is mount,ed, is provided withl an arm 26 which prevents actuation ofthe alarm mechanism, as long assaid arm is held. `Novel provision is made .for normally holding this arm but for releasing it at the proper time.' y Fig. 1 is a vertical' sectional view through A. control leverL 27 'is fulcrumed between its the invention showing it applied/to a ydoor ends at 28 upon the' fronti side of the back and door frame.V f f j plate 9, said lever having an' angular end 29 Fig. 2 is a front elevation. of the device which normally engages the arm 26 to hold with thecasing removed, parts being broken the latter against movement, thus preventing away and in section. movement of the clafpper22. A spring 30 is Figs. 3, 4 and 5 are detail horizontal sec. tional views on the zplane of line 3 3 of Fig. 1, showing different positions of parts which will be hereinafterdescribed. j

Fig. 6 isa small diagrammatic. view Villustrating the manner of. applying the in vention to a door. j

Fig. 7 is a detail sectional view, partly in' elevation illustrating the manner in which4v the control member is permitted to move to the maximum, whereas Vsuch movement isv not permitted in Fig. 2.- 1

Fig. v8 is a fragmentary vertical section similar to a portion of 1 but'illustrating va modified form of'construction.

The drawings above briefly described,.may be considered as disclosing the. preferred form of construction, it being understood however that within the scope'of the invention as claimed, variations may be made.

The numeral 9 designates a back plate hold the latter Iin the operative position shown in Fig 2, the movement of the lever in 4either direction being limitedby an ap-` propriete-yoker 31. This lever 27 is provided with a resilientlower portion 32 which norinally abuts .the outer endofthefstud 13, so that'said lower portion ofthe lever is held outwardlyraway.-fromthe back plate 9, as seen in Fig. 1. lShould pressure vbe exerted on the door-10 however in the direction of `thearrow A (Fig. 1), such pressure would separate. the back plate 9 from the board or the like 15, as seen injFig..1, and upon such `anoccurrence, the stud 13 `would no longer project beyond vthe front surface of the plate 9,'the result being thatthe resiliency of the lever vportion 32, would cause said portion to move toward the back plate as will be clear from Fig. 4. l This movement disengages'the angularend 29 of the lever 27, from the arm secured to a door 10 by screws 11, said back 26 and permits the clapper'22 to operate. platev projecting beyond'an edge ofthe door, Thus, it will be seen thaty if an attempt is said edge being preferably the 'upper edge. made to force thedoor open or if Vsaid door vice 24 may be .employed to hold .theclapper l :sav

connectedwith the lever 27 so'as to normally lll) ` sounding of the alarm.

the upper end of. lever 27 mayv be cone..

nected with an arm 36 on the knob shaft of the door 10, said line being passed through an appropriate guide 37, said guide being appropriately mounted lupon said Thus, if the door knob is turnedy in an attempt to open the door, ther lil-ne 35 will be pulled, thus swinging the lever 27 to free its lower end 29 from the arm, 26, permitting If this lever is moved as far as the dotted line position of Fig., 2, it will snap past the projecting end of the pin 13 so that it is held'a'gainst movement to its normal position, under the influence of the spring 30. However, if the lever 27 isy not permitted to move this far, it will return to the normal flull line position of Fig. 2;, as soon as the knob is released. In lorder that the lever may be permitted to move. eitherv to one position or the other, as desired, I. provide a rotatable member 438 turnably mounted" upon the plate 9 and having a notch 39. `When thismember 38 isset as shown in Fig. 2, the lever 27 cannot swing sufficiently far to be locked against return movement, by the stud 13. When the member 38 is turned to the position of Fig. 7, the u pper endv of the lever 27 may move into theA notch 39, permitting said lever to turn to the dotted line position of Fig. 2, in which position it will engage the stud 13, so that it is locked against return movement by said stud, the result being that the alarm will operate until someone from the inside off the building resets the device.

It will be seenV from the foregoingl that while the invention is rather simple and inexpensive, it will be efli'cient and in every way desirable, as when it is used upon a door, it sounds an alarm when the knob is turned or when attempt is made to force or drill thedoor. Fig. 3A of the drawings discloses the normal position of the lever end 29 to hold the arm r26 against operation, but Fig. Al illustrates the manner in which said arm is released when the door -is` inwardly forced from the frame and the lever 27 consequent-lf;vv springs toward theback plate 9.

Y Fig. 5 illustrates the manner in which the lever 27 snaps into engagement with the stud l3`to be locked the latter against return movement, when swinging of the lever to this'extent is permitted by setting of the device 38, in the manner shown in Fig. 7.

Fig. 8 illustrates a slightly different form of construction, in which a stud 13.*, instead of being rigidly carried by a board or the Vlike' such as l5, isv loosely mounted'in an Vopening l2n in Vthe back plate 9a, said pin coming in contact with the nail, screw or the like 1l driven into the door frame 17a when door. l

The pin 13a is thus disengages from the arm 261 and permits i operation of the alarm, it being understood that this arm 26a and the lever 27a are identical with the parts 26 and 27 above den scribed.

As excellent results may be obtained from the details disclosed,v theyv are preferably followed. However, with-in the scope ofthe linvention asy claimed, numerous' modifications may be made.

Attention may further be directed to the fac-t that the invention may act alsov as a door bell,as it will operate simplyV by turn-A ing the knob to a slight extent.

l claim :e

l. In a burglar alarm, an alarm-sounding meansY for limiting the ymovement of; 'said member to, saidone position if desired, and means for holding said member against returnto its normal posit-ion when moved to its second released position at which the alarm sounds continuously. i

2. In a burglar alarm, an alarm-sounding Amechanism, a pivotally mounted control member normally engaging the alarm-'sounding mechanism to. hold the same against functioning, said member beingvswingable in the same direction to either of two released positions atwhich it permits sounding of the -alarm fora short period or continuously, respectively, a springl acting on said member to return it to its normal position when moved t-o its first released position, manually set means kfior limiting the mov-ement of' said member to said first released position if' desired, and means for *holdingr said member against return to its normal position vwhen moved to, its second released position at which the alarm sounds continuously. Y

3. In a burglar alarm, an alarm-sounding mechanism, and a control member normally engaging said alarm-sounding mechanism to hold it against functioning, said member being movable on either of two distinct paths to'r-elease said alarm-sounding mechanism, whereby said member may be operatively relatedl with a closure to be' released by either of two movements thereof` 4. In a burglar alarm, an alarm-sounding mechanism, a control member normally engaging said mechanism to hold it against functioning, means mounting said member for movement. on one path to a released posiw tion, said member being resilient to permit it to spring to a second ieleased position in a direction transverse to said path, means operatively connected with said control member for effecting movement thereof onv said path, and additional means stationary with respect to and normally abutting' said cont-rol member to normally prevent springs ing of said member to said second released position.

5. In a burglar alarm, a back plate, an alarm-sounding mechanism thereon, a lever fulcrumed between its ends to said back plate and having one end normally engaged with said mechanism to prevent l'functioning independent thereof, means connected to said lever to swing it about its fulcrum to a releasedv position, said lever having aresilient portion permitting it to spring transversely of lits plane of swinging movement to a second released position, said back plate having an openingl normally covered by said one end o' the lever, and a pin passing movably` tliioughrsaid openingl and projecting rorwaidly from said back plate to normally engage said one end of said lever and hold it against springing to said second released position. y

6. A structure as specified in claim 5; said one end of said lever being adapted to spring into locking engagement with said pin when said lever is swung to the first named released position, whereby it is heldV against return to its normal position.

In testimony whereof I have hereunto alixed my signature.

ALFONS RUMRICH.

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