US2659333A

US2659333A - Self-contained burglar alarm unit

Info

Publication number: US2659333A
Application number: US247086A
Authority: US
Inventors: Lewis E Davis
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-09-18
Filing date: 1951-09-18
Publication date: 1953-11-17
Anticipated expiration: 1970-11-17

Description

Nov. 17, 1953 E. DAVIS 2,659,333

SELF-CONTAINED BURGLAR ALARM UNIT Filed Sept. 18, 1951 2 Sheets-Sheet 1 v IN VEN TOR.

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ATTU R N EYB' Nov. 17, 1953 L. E. DAVIS 2,659,333

SELF-CONTAINED BURGLAR ALARM UNIT Filed Sept. 18, 1951 2 Sheets-Sheet 2 I N VEN TOR.

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ATTCI RN EYS Patented Nov. 17, 1953 UNITED STATES PATENT OFFICE SELF-CONTAINED BURGLAR ALARM UNIT Lewis E. Davis, Burbank, Calif.

Application September 18, 1951, Serial No. 247,086

This invention relates to individual burglar alarm units of the clock mechanism actuated type in which the parts are actuated by springs instead of electricity, and in'particular a casing having a cover providing a bell with a spring arm having a rubber cup on the extended end piv otally mounted in the casing and positioned to release a bell clapper when an object suchas a window, is moved in either direction in relation to the side of a window frame upon which the casing is mounted.

The purpose of this invention is to provide a comparatively small burglar alarm unit wherein an individual may attach a unit to different obiects in the home such as doors, windows, and the like and wherein one unit is installed on each of said objects and the units are independently actuated.

Various types of independently operating burglar alarm units have been provided for windows, doors, the like, however, for the average household use where elaborate units are not required it is desirable to provide a small independently operated unit wherein only one, or as many units as may be desired may be used in a residence.

The object of this invention is, therefore, to provide means for forming a burglar alarm unit whereby a single unit may be used on each window, door, or the like of a residence and-wherein only one unit, or as many units as may be desired may be used.

Another object of the invention is to provide an individual burglar alarm unit that operates independent of electrical connections.

Another object of the invention is to provide a burglar alarm unit in Which the alarm is sounded at the unit whereby both the intruder and the occupant of the residence or building know that an alarm beensounded.

A further object of the invention is to provide an individual alarm unit which is of a simple and economical construction.

With these and other objects and advantages in view the invention embodies a mounting plate having clock works mounted thereon, with an operating arm extended therefrom and with a bell positioned over the clock works and adapted to be engaged by a clapper thereof.

Qther features and advantages of the invention will appear from the following description taken,

in connection with the drawings wherein:

Figure l is a sectional plan through the individual burglar alarm unit taken on line l-l of Figure 2.

1 Claim. (Cl. 116-91) Figure 2 is a front elevational view of the unit with the cover or bell broken away and shown in section.

Figure 3 is an end elevational view of the unit looking toward the end from which the vacuum cup carrying spring arm extends.

Figure 4 is a sectional plan through the unit taken on line 4- of Figure 2.

Figure 5 is a longitudinal section through the unit taken on line 5-5 of Figure 1.

Figure 6 is a detail taken on line 66 of Fig ure 1 illustrating the mounting of the spring arm and showing a pin which provides a trigger for holding and releasing the bell clapper of the unit.

Figure '2 is a sectionsimilar to that shown in Figure 6 being taken on line T-l of Figure 1.

Referring now to the drawings wherein like reference characters denote corresponding parts theindividual burglar alarm unit of this invention includes a mounting plate Ill, L-shape in cross section upon which conventional clock works are mounted, a support plate H carried by the mounting plate, a cover [2 providing a bell, and a springarm l3 having a rubber cup hi on the outer end and pivotally mounted on a post I5. I

The mounting plate It is provided with a flange iii in which screw holes I? are provided by which the unit is attached to a window or door frame, as indicated by the numeral It? with screws i9. 7

I The support plate I l is spaced from the mounting plate It by a plurality of posts 20, 2! and 22 and the posts, which are provided with threaded socketsin the ends, are secured to the mounting plate It by screws 23 and to the support plate I I by screws 26.

Elie clock works, which is positioned between the plates 19 and. El includes a main spring 25, and a gear 26' having a pawl 2! pivotally mounted thereon and held into engagement with a ratchet wheel 23 by a spring 29. The spring is mounted on a winding stem 33 having a key ill on the outer end and the gear 26 meshes with a pinion 32 on a shaft 33 on which a toothed wheel 34 is mounted. The toothed wheel is positioned to be engaged by projections of an escapement arm 35 that is pivotally mounted on a pin 36 and that is positioned to be held stationary by a pin or trigger 31. I

The eseapement arm 35, which provides a bell clapper, is mounted whereby a knob 38 on one end engages the cover or bell I2 as the escapement arm is operated by the toothed wheel 34 upon release of the escapement arm by the pin 31. The ends of the pins 33 and 3B are joumaled in the mounting and supporting plates l and II respectively.

The cover or bell I2 is supported from the support plate H by a post 39, the lower end of the post being secured in the support plate and the upper end provided with a threaded socket 40 into which a screw 4| that holds the bell to the post, is threaded.

The spring arm 13 is adjustably mounted in a socket 42 in which it is held by a set screw 43 and the socket is provided with an extended stem 44 which is ivotally mounted by a threaded stud 45 on the upper end of the post l5. The stud is provided with a nut 46 and a spring 41 positioned on the stud is provided with an extended end 48 that urges the spring arm l3 downwardly with the rubber cup M in engagement with the upper surface of a top rail of a window sash as indicated by the numeral 49.

The socket '44 is also provided with a point 50 that rides on the upper surface of a spring plate or arm that carries the pin or trigger 31, and the arm 55 is mounted under the head of the screw 24 that is threaded in the socket in the upper end of the post 22. The end of the arm 5| is provided with an opening 52, as shown in Figure 7, that is positioned around the post l5, and which is formed in a bent or inclined section 53 on the outer end of the arm.

The post I5 is mounted in the support plate II as illustrated in Figure 6 whereby a mounting flange 54 is resiliently held against one side of the plate H by a spring washer 55 that is secured by a nut 56 on a stud 51 which extends from the flange 54, the stud passing through the plate H.

The section 53 is circular in shape, as shown in Figure 1, whereby the point or projection 50 may travel in a complete circle and still be in engagement with the upper surface of thev arm.

With the parts in the cocked position, as illustrated in Figures 2, 6 and 7 the trigger or pin 31 is in engagement with the bell clapper base or escapement arm 35 and should the window sash be raised or a door opened the arm l3 would spring upward or outward, dependin upon the manner in which the device is installed, and in this movement the point 50 moves away from the arm 5| and the resiliency of the arm withdraws the pin 31 thereby releasing the arm 35. Upon release of the arm 35 the bell clapper will operate to ring the bell.

Should it be desired to disengage the alarm it is only necessary to move the arm [3 through an angle of 90 degrees whereby the arm 5| will be held downwardly with the pin 31 in engagement with the bell clapper base.

The spring wire or arm l3 extends through a 6 slot til in one end of the cover or bell l2, as

4 shown in Figures 1 and 3, whereby the wire arm is free to move upwardly or downwardly with the movement of the sash or door.

with the parts arranged in this manner a home guard alarm device or individual burglar alarm is provided and the device may readily be installed upon windows, doors, or other objects where protection is desired and should an intruder attempt to open a window or door or move an object the bell clapper would be released and an alarm sounded at the point where the burglary is attempted. The alarm device therefore, warns occupants of the household and discourages the intruder.

It will be understood that modifications may be made in the design and arrangement of the parts without departin ro the sp f the invention.

What is claimed is:

In a burglar alarm, an L-shaped mounting plate provided with a flange for attachment to a supporting structure, a support plate carried by said mounting plate, a cover providing a bell and having a slot therein, a spring-arm pivotally extending through said slot, a resilient cup connected to the outer end of said spring-arm, a plurality of spaced parallel posts extending between said mounting plate and support plate and secured thereto, a clock-work positioned between said pair of plates and including a main spring, a winding stem having its inner end connected to said main spring, a gear mounted on said stem. a rachet wheel arranged contiguous to said gear, a spring pressed pivotally mounted pawl arranged in engagement with said rachet wheel, a shaft spaced from said stem, a pinion mounted on said shaft and meshing with said gear, a tooth wheel positioned within said cover, a pivotally mounted escapement arm having a knob on one end providing a bell clapper for engagement with said cover, said escapement arm having projections for engagement with said tooth wheel, a trigger for controlling movement of said escapement arm. a post extending between said support plate and cover. and secured thereto, a spring member for biasing said spring arm in one direction, a socket connected to the inner end of said spring arm. and having a point extending therefrom, and a spring plate extending from said trigger and having a circular section engaged by said point.

LEWIS E. DAVIS.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 773,165 Smith Oct. 25, 1904 2,469,528 suma May 10, 1949 2,611,334 Counts et a1 Sept. 23, 1952