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Publication numberUS1051962 A
Publication typeGrant
Publication dateFeb 4, 1913
Filing dateFeb 11, 1911
Priority dateFeb 11, 1911
Publication numberUS 1051962 A, US 1051962A, US-A-1051962, US1051962 A, US1051962A
InventorsFrank A Lundquist
Original AssigneeFrank A Lundquist
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1051962 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)




To all whom it may concern:

Be it known that I, FRANK A. LUNDQUIST, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented new and useful Improvements in Burglar-Alarms, of which the following is a specification.

This invention relates to alarms, and more particularly to the class of burglar alarm devices.

The particular object of the invention is the provision of a burglar alarm device comprising a hollow cylinder having a plurality of striker elements provided thereon, attaching means arranged at opposite ends of the cylinder adapted to be connected to a window frame and one of its sashes, and spring tension means adapted to rotate the cylinder so as to cause the knocker elements to strike the pane of glass arranged within the said sash.

lVith these and other objects in view, as will appear as the description proceeds, the invention comprises the various novel features of construction and arrangement of parts which will be hereinafter more fully described and set forth with particularity in the appended claims.

Referring more particularly to the drawings, Figure 1 is an elevation of the alarm device shown in applied position, Fig. 2 is a vertical sectional view through the device, and Fig. 3 is a top plan view of Fig. 2.

Similar reference characters are used to denote like parts throughout the specification and the accompanying drawings.

Referring to the drawings, the device will be seen to consist of a hollow cylinder 5, the lower end of which is threaded eXteriorly to receive a cap or bottom 6, which latter is provided centrally with an aperture through which projects the shank 7 of a swivel 8. The lower outer end of the shank of the swivel is provided with an eye. to which is connected one end of a hook 9. Secured to the window sill is a screw eye or other suitable device 10 with which the opposite end of the hook 9 is adapted to engage to maintain the device in position. The upper end of the cylinder 5 is closed, as shown at 11, and is provided centrally with a square aperture 12. Arranged within the cylinder adjacent the lower end thereof is a disk 13 secured to the cylinder by any suitable means, such as screws 14. The disk 13 is provided centrally upon its upper face Specification of Letters Patent.

Application filed February 11, 1911.

Patented Feb. 4, 1913.

Serial No. 607,962.

with an upstanding boss 15 which latter is provided with a socket adapted to receive and support the lower end of a spindle 16.-

The spindle 16 has its upper end portion squared, as 'shown at 16, and the inner portion thereof is adapted to slidingly fit and seat within the aperture 12 in the upper end 11 of the cylinder. The spindle is provided adjacent the inner end of the upper squared portion with a reduced circular shank 17.

Surrounding the spindle 16 is a coiled tension spring which has its lower end secured to the boss 15 of the disk 13 and the upper end thereof is secured to a flange 19 adjacent the reduced portion 17 at the upper end of the spindle, and is in spaced relation to the inner face of the top 11 of the cylinder. The upper squared portion 16 of the spindle is provided with a thumb nut 20 which latter normally rests upon the upper surface of the top 11 of the cylinder. The upper end of the squared portion 16 is provided with an aperture to which is connected a hook 21, the latter having connected thereto one end of a chain 22, the opposite end of the chain being detachably connected with a projection 22 upon the inner face of the window sash. Y

Provided on the outer surface of the cylinder 5 are a plurality of swinging flexible striker elements 23, each of which comprises, preferably, a ball of suitable material and a chain or other flexible element secured to the ball and to the outer surface of the cylinder 5 whereby said ball may have a free swinging movement.

It will be seen by reference to Fig. 1 that since the device is arranged adjacent the pane of glass of the sash that should the latter be raised in an attempt to allow a person to pass through the window or for some other reason, the spindle 16 will be lifted by reason of the connection between the upper end thereof and the sash. By this movement the lower end of the squared portion 16 is disengaged from the aperture 12 in the upper end of the cylinder and the reduced portion 17 is brought into engagement with the aperture whereby the spring 18 carried by the spindle 16 will adjacent window pane. It will be apparent by reason of the reduced shank portion 17 and the swivel 8 that the cylinder 5 will be free to rotate upon and around the spindle 16. After the device has been set off the spindle is lifted so that the reduced portion thereof engages within the aperture 12 whereby the thumb nut 20 may be grasped and revolved to replace the tension upon the spring surrounding the spindle. After sufficient tension has been placed upon the spring the spindle is allowed to descend to its normal position so that the lower end of the squared portion l6 rests within the upper aperture 12, thus preventing the cylinder against rotation.

From the foregoing description, taken in connection with the accompanying drawings, the advantages of construction and the method. of operation will be readily apparent to those skilled in the art to which the invention relates, and while I have described the principle of operation of the invention, together with the device which is now considered to be the best embodiment thereof, I desire to have it understood that such changes of construction may be made when desired as are within the scope of the appended claims.

W'hat I claim as new is 1. A burglar alarm device comprising a hollow cylinder, the opposite ends of which are closed and provided with a round and a square aperture respectively, a plurality of striker elements pivotally supported upon .the cylinder, a spindle arranged within the cylinder and provided at its upper end with a squared portlon, and a reduced circular portion adjacent the inner end of the squared portion, said squared portion adapted to normally seat within the square aperture in the end of the cylinder, a spring surrounding the spindle having one end con nected to the spindle and the other end to the cylinder, a swivel arranged within the aperture at the lower end of the cylinder, and means connected with the swivel and the outer end of the spindle whereby the device may be supported in operative position.

2. A burglar alarm device comprising a hollow cylinder having a squared aperture in one end, a plurality of striker elements pivotally supported upon the cylinder, a disk arranged within the cylinder and connected thereto adjacent one end and provided with an upstanding hollow boss, a spindle arranged within the cylinder and having its lower end pivotally supported Within the boss, the upper end of the spindle being squared and projecting through the squared aperture in the end of the cylind-er, said spindle being reduced to form a circular shank adjacent the squared portion, a tensioned coiled spring surrounding the spindle and connected to the spindle and the disk, means for connecting the outer end of the spindle to a window sash and means for swivelly connecting the opposite end of the device to a window frame.

In testimony whereof I afliX my signature in presence of two witnesses.




Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5530428 *Jun 9, 1995Jun 25, 1996Woods; RandallSecurity alarm switch
US5673021 *May 22, 1996Sep 30, 1997Woods; RandallMagnetic switch assembly for detecting unauthorized opening of doors or windows
US5880659 *Mar 17, 1997Mar 9, 1999Woods; RandellMagnetic switch assembly for detecting unauthorized opening of doors or windows
US5977873 *Mar 4, 1998Nov 2, 1999Woods; RandallAlarm switch
US6087936 *Dec 29, 1998Jul 11, 2000Woods; RandallVibration sensor
USRE39731 *Jul 27, 2001Jul 17, 2007Magnasphere CorporationAlarm switch
U.S. Classification116/86, 116/170
Cooperative ClassificationG08B13/08