US694456A - Burglar and fire alarm. - Google Patents

Description

- Patented Mar. 4, |902. n. BARRETT.

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ROY BARRETT, OF PALMYRA, NEW YORK.

BURG'LAR AND FIRE ALARM'.

SPECIFICATION forming part ofletters Patent No. 694,456, datedlMarch 4, 1902.

Application fiiea July is, 1901.

To all whom it may concern:

Be it known that I, ROY BARRETT, a citizen of the United States,residing at Palmyra, in the county of Wayne and State of New York, have invented certain new and useful Improvements in Burglar and Fire Alarms; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in burglar and fire alarms, and has for its object the production of a simple and effective device of this character adapted to be employed in connection with the sashes of a window or a fusible cordor wire and upon the opening of the window-sash or severance of the cord or wire to be set in operation to re off a series of blank cartridges in quick succession, thereby giving an alarm.

With this and otherobjects in view the i11- vention consists of 'certain novel features of construction, combination, and arrangement of parts, as will be hereinafter more fully described, and particularly pointed out in the appended claims.

In the accompanying drawings, Figure 1 is a perspective view of a burglar and lire alarm embodying my invention. Fig. 2 is a sectional view through'the cylinder and plunger, showing the latter as in the act of being propelled upwardly and the ejector as in the act of releasing a cartridge-shell from the firingpin. Fig. 3 is a section through the plungerturning device, showing the'manner of mounting the same upon ythe rod. Fig.- 4 is a side elevation of the turning device onan enlarged scale, and Fig. 5 is a perspective 4viewshowing the parts of the Vturning device separated, but arranged in their proper relative positions.

Referring now more particularly to the drawings, the numeral 1 represents a rectangular rod or bar, which is provided at its lower end with supporting-feet 2 for holding it in a perpendicular position and carries at its base a cylinder 3, having chambers to receive a number of blank cartridges. These chambers correspond in number to the sides of the rod or bar, so that if the rod or bar' is made square four chambers will be employed, dac.,

in order to secure the proper guiding of the sei-iai No. 6 8,796. or@ miei.)

plunger to successively bring the firing-pin into engagement with each cartridge. Suitably mounted upon the rod or bar is a hammer or plunger 4, which has an opening corresponding to the configuration of the bar, so as to prevent the plunger from turning on the bar except as hereinafter specified, and is provided with an upwardly-projecting arm 5, carryinga guide-pin 6. Projecting from the base of the plunger is a firing-pin 7, which extends through an opening in a spring-metal ejector 8, which isadapted upon the firing of the cartridge to release the cartridge held from-the pin. The rod or bar carries at its upper end a device for turning the plunger or hammer so as to bringthe firing-pin into position to successively engage each of the cartridges contained within the cylinder. This device com'- prises in its construction two cylindrical sections 9 and 10the lowersection 9 being provided with a rectangular bore to engage an upper rectangular portion 11 of the bar, whereby said section is held from axial movement. The upper section 10 is loosely fitted on the rod, the extremity of which above said rectangular portionlis threaded at 12 for the reception of a nut 13, holding the section 10 in interlocking engagement with the said section 9. The two sections are formed in their .meeting edges with notches providing interlocking points and provided at regular intervalswith radial ribs forming spaced slots. The ribs 14 on the lower section 9 are formed each with a straight side 15 and a curved side 16, and formed i between them are vertical slots 17. VThe ribs 1 8 of the upper section 10 are'arranged to come on lines between the ribs of the lower'section 9, thus being arranged above each of the said slots 17, and form between them similar slots 17. The lower edges of each of the ribs 18 on the side facing the straight side edges of the ribs 14 have a pronounced curve, while their opposite lower side edges 2O have a somewhat-slightercurve, thus forming flaring or V-sha-ped entrances IOS the hammer to be given a quarter-turn upon each of its upward movements to successively bring the firing-pin into engagement with each cartridge and to thus discharge the cartridges in quick succession.

The hammer is adapted to be suspended at a sufficient elevation above the cylinder 3 in any approved manner, such as by means of a catch or detent on a window-sash engaging the pin 6, when the device is employed as a burglar-alarm, or by means of a fusible cord or wire 22, connected at one end to the pin 6 and at the other end to a suitable iixcd object in the room or compartment, the construction and arrangement of parts being such that when the window is open and the detent released from engagement with the firing-pin or the cord 22 is severed bythe flames or heat the hammer will be no longer supported and may slide down the rod by gravity to discharge the cartridges. Upon the initial downward movement of the rod the tiring-pin comes into contact with and discharges one of the cartridges, thus sounding the rst alarm, and under the force of the explosion the plunger or hammer is propelled or projected upwardly and guided by the rod until the pin 6 passes upwardly into one of the slots 17 of the lower section 9 of the turning device,when the hammer reaches the rounded or cylindrical portion of the rod and is left free to turn. Upon the further movement of the hammer the pin 6 engages the curved wall 19 of one ot' the ribs 18 of the section 10 ot' the turning device and is guided into the slot 17'. At this point the propulsive energy of the hammer is expended and the hammer drops downward upon the curved edge 16 of the rib 14 to the right of the slots 17 17', through which the pin has just traveled, and is thereby guided downward into the next adjacent slot 17, whereby the hammer or plunger is given a quarter-turn and again drops down to slide upon the rectangular portion of the rod and to bring the tiring-pin into engagement with the next cartridge in the path of rotation of said hammer, when a repetition of the operation just described ensues, and this is continued until all the cartridges are fired off, sounding a number of alarms in quick succession.

From the foregoing description, taken in connection with the accompanying drawings, the construction, mode of operation, and advantages of the invention will be readily understood, and it will be seen that a device is provided which may be inexpensively produced and is adapted to perform its work in an efficient manner.

Changes in the form, proportion, and minor details of construction may be made within the scope of the invention without departing from the spirit or sacrificing any of the advantages thereof.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. An alarm device of the character described, comprising a rod or bar, a cartridgeholder arranged at one point upon the rod or bar and adapted to receive a number of cartridges, a hammer or plunger slidably mount.

ed upon the rod or bar above said cartridgeholder and having a firing-pin to discharge the cartridges, and adapted to be upwardly propelled by the force of the explosion, and means for turning said hammer or plunger to successively bring the firing-pin into engagement with each cartridge, substantially as described.

2. In a device of the character described, the combination of a rod or bar, a cartridgeholder mounted thereon, a hammer or plunger slidable upon the bar and carrying a fir.- ing-pin and adapted to drop by gravity to discharge the cartridges, a turning device upon the bar adapted to turn the hammer to bring the firing-pin in position to successively engage each cartridge, said turning device being provided with guide-slots, and a guidepin on the hammer cooperating with said slots, substantially as described.

3. In a device of the character described, the combination of a rectangular rod or bar provided adjacent to its upper end with a round or cylindrical portion, a cartridgeholder at the base of the bar, a drop hammer or plunger slidably mounted upon the bar and carrying a firing-pin to engage the cartridges7 said hammer having a guide-pin and adapted to turn upon said cylindrical portion, and a turning device above the cylindrical portion having guide-slots cooperating with said pin to aect the turning of the hammer, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ROY BARRETT.

Witnesses:

FREDERICK E. CONVERSE, WILLIAM H. BowMAN.

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