US2244431A

US2244431A - Alarm mechanism

Info

Publication number: US2244431A
Application number: US285395A
Authority: US
Inventors: Alfred W Piceardi
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-07-19
Filing date: 1939-07-19
Publication date: 1941-06-03
Anticipated expiration: 1958-06-03

Description

June 3, 1941. w, p cc m 2,244,431

ALARM MECHANISM Filed July 19, 1939 Alfred hzPz lccardi:

INVENTOR ATTO RNEYS Patented June 3, 1941 UNETED STATES PATENT OFFICE ALARM MECHANISM Alfred W. Piccardi, New York, N. Y. Application July 19, 1939, Serial No. 285,395

4. Claims. I (01. 116- 90) The present invention relates to a new and improved alarm mechanism especially adaptable for use with windows whereby an alarm is sounded upon unauthorized raising or lowering of the window.

An important object of the invention resides in the provision of an alarm mechanism carried by the lower sash of a window with a portion thereof in contact with the side rail of the upper sash whereby the raising of the lower sash or lowering of the upper sash will sound the alarm.

A further object of the invention is to provide an alarm mechanism embodying means for preventing contact of the same with the upper sash without removing the device from the lower sash.

A still further object of the invention is to construct an alarm mechanism of the character described, in a very simple, economic and durable manner and one that may be easily applied to and removed from the window sashes.

The invention will be fully and comprehensively understood from a consideration of the following detailed description when read in connection with the accompanying drawing which forms a part of the application.

In the drawing:

Figure 1 is a vertical sectional view of a portion of a window with the alarm mechanism associated therewith.

Figure 2 is a front elevational view of the same.

'Figure'3 is a front elevational view of the interior of the alarm mechanism with the gong removed and with a portion of thesupportingplate shown in section. V

Figure 4 is a detail sectional view taken substantially on line 4-4 of Figure 3.

Figure 5 is a fragmentary exploded perspective view of one of the striker arms, and

Figure 6 is a perspective view of one of the cam members forming a part of the alarm mechanism and removed therefrom.

Referring to the drawing for a more detailed description thereof, there is disclosed a portion of a window frame comprising an upper sash A and lower sash B. The improved alarm mechanism generally designated by the reference numeral 8 is adapted to be attached to the upper end of the meeting rail 9 of the lower sash B and may be disposed at either the right-hand or left-hand side so as to have contact with the side rail [0 of the upper sash A.

The mechanism is attached to the upper end of the meeting rail 9 of the lower sash B by means of a plate H, the same being secured to the rail 9 by any approved fastening means I2. As more clearly shown in Figure 1 of the drawing, the plate is disposed on the rail 9 so that one end l3 thereof lies flush with the front face of said rail. The end I3 is formed with parallel sides M for receiving therebetween an arm l5, said arm being pivotally attached to said sides as indicated at l6. The arm I5 normally inclines toward the side rail ill of the upper sash in order to maintain the alarm mechanism in contact therewith, said alarm mechanism being carried by'said arm in a manner to be hereinafter described. For maintaining the arm l5 in a vertical position so that the mechanism is out of contact with the side rail ii], there is provided the lever ll pivotally connected at 18 within a slot l9 formed in the arm. The lever H is formed with a shoulder l8 adapted to engage a projection l9 formed on the end I3 as shown in Figure 3. A tension spring 20 attached to ears 2| and 22 projecting from the arm l5 and plate II, respectively, normally urges said arm toward the side rail 10.

The upper end of the arm I5 is interiorly threaded for receiving the threaded end 23 of a shaft 24, said shaft extending at right angles to said arm. The shaft 24 forms a support for the flanged plate 25, said plate being formed with a hub 26 through which the shaft extends for maintaining the plate spaced from the arm IS. A rubber or the like ring 21 is carried by the flanged plate 25 representing that portion of the mechanism in engagement with the side rail Ill of the upper sash A.-

The plate 25 is formed with a series of

slots

28 and 29, respectively, the slots 28 receiving the members 30 and the slots 29 receiving the tension springs 3!. The plates 30 serve as camlike members to be engaged by the strikers 32 as the plate 25 revolves about the shaft 24. The shape of the plate or cam-like members 39 is more clearly shown in Figure 6 of the drawing and it will be noted that the same is formed with a fiat surface 33 for engagement with the back of the plate 25 and a raised portion 34 adapted to extend through the slot 28. The members 30 are pivoted intermediate their ends as indicated at 35 to the plate 25 and the opposite end thereof is formed with a hook-shaped portion 36 for receiving one end of the tension spring 3|. The opposite end of the tension spring 3| is attached to the end of the slot 29. The members 30 will swing about their pivots 35 the width of the slots 28 against the tension of the springs 3|, said members being moved by engagement of the strikers 32 as the plate 25 is revolved in an anti-clockwise direction.

The striking mechanism is in the shape of a pronged spider, the central portion of which is formed with a rectangular-shaped slot 31 receivable on the flattened end 38 of the shaft 24 and resting against the hub 26 as shown in Figure 4. Each arm 39 has its end slotted as indicated at 40 and threaded as indicated at 4| for receiving the flexible spring 42 and striking element 32, the striking element being held within the spring 42. A gong 43 is attached to theshaft and completely encases the spider-shaped striking mechanism.

In use of the mechanism and when desiring to have the alarm sound upon unauthorized opening of the windows, the lever I! will be disengaged from the projection IS in order that the flanged wheel may have contact with the side rail 10 as shown in full lines in Figure 1 of the drawing. Raising the lower sash B will cause the flanged who 25 to rotate in the direction of the arrow 44 at which time the striking members 32 will ride over the portion 34 of cam-like members 30 which project through the slots 28 and as the striking member becomes disengaged from said projecting portion will strike the gong 43 sounding the alarm. Thestriking members 32 and cam-like members 36 are arranged in such a manner that as one striking member passes over one projection another striking member is becoming engaged with another projection whereby a substantially uninterrupted alarm will be sounded. The spring E2 being flem'ble will become distorted as the striking member 32 engages the face of the projection 34 as indicated at 45 in Figure 3 of the drawing and when leaving said projection will spring back into shape thereby contacting the gong 43.

Also it will be understood, of course, by those skilled in the art, that variations in the hereinabove described device involving the substitution of substantial equivalents for the devices described are intended to be comprehended within a the spirit of the present invention and that the invention is capable of extended application and is not confined to the exact showing of the drawing nor to the precise construction described and, therefore, such changes and modifications may be made therein as do not affect the spirit of the invention nor exceed the scope thereof as expressed in the appended claims.

What is claimed is:

1. An alarm mechanism for use with upper and lower window sashes, comprising, aplate adapted to be attached to the upper face of the meeting rail of the lower sash, anvarm. pivotally attached to said plate, a shaft extending at right angles to said arm, a flanged plate mounted for rotation on said shaft adapted for contact with the upper sash, cam-like members supported within said flanged plate, a striker secured to said shaft adapted to engage said cam-like members upon rotation of said flanged plate, and a gong supported on said shaft for contact by said strikers when disengaged from said members.

2. An alarm mechanism for use with upper and lower window sashes, comprising, a plate adapted to be attached to the lower sash, an arm pivotally attached to said plate, a shaft extending at right angles to said arm,'a flanged plate mounted for rotation on said shaft adapted for contact with the upper sash, said flanged plate being formed with a series of diagonally disposed slots, camlike members supported within certain of said slots, flexible strikers secured to said shaft adapted to engage said cam-like members upon rotation of said flanged plate, and a gong supported on said shaft for contact by said strikers when disengaged from said members while moving one sash relative to the other. V g

3. An alarm mechanism for use with upper and lower window sashes, comprising, a plate adapted to be attached to the lower sash, one end of said plate being formed with vertical extending side walls, a projection on the end of said plate, an arm pivotally attached to said side walls, means carried by said arm having contact with the upper sash for sounding an alarm upon raising said lower sash or lowering said upper sash, and means for maintaining said first-mentioned means out of contact with said upper sash, said second-mentioned means comprising a lever pivotally connected to said arm and formed with a shoulder portion for engagement with the projection on the end of said plate. 7

4. An alarm mechanism for use with upper and lower window sashes comprising, a plate adapted to be attached to the upper face of, the meeting rail of the lower sash, an arm pivotally attached to the said plate, a shaftextending at right angles to said arm, a flanged plate mounted for rotation on said shaft and adapted for contact with the uppfir sash, said flanged plate having an enlarged central hub portion through which said shaft extends, a member having a central section mounted on the end of said shaft and formed with a multiplicity of prong-shaped arms, flexible striking elements mounted on each of said arms, cam like members supported within said flanged plate, said striking elements adapted'to engage said cam like members upon rotation of said flanged plate, and a gong supported on said shaft for contact by said strikers when disengaged from said members.

ALFRED W. PICCARDI.