US2625902A

US2625902A - Fire and burglar alarm

Info

Publication number: US2625902A
Application number: US174215A
Authority: US
Inventors: Harold C Sorensen
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-07-17
Filing date: 1950-07-17
Publication date: 1953-01-20
Anticipated expiration: 1970-01-20

Description

Jan. 20, 1953 H. c. SORENSEN FIRE AND BURGLAR ALARM Filed July 17, 1950 Fig.

Harold 62 Sorensen IN VEN TOR.

Patented Jan. 20, 1953 UNITED STATES PTENT OFFICE FIRE AND BURGLAR ALARM Harold C. Sorensen, Manitowoc, Wis. Application July 17, 1950, SerialNo. 174,215

3 Claims- This invention, comprises novel and useful improvements in alarms, and more, particularly. per-v tains to a combination fire and burglar alarm.

Various important objects of this invention are to provide a combination fire and burglar alarm which is of compact and simple construction; which has an efficacious appearance; and in which the hammer brake arm will be released either in response to a predetermined high temperature, or in response to the passage of an intruder through a predetermined area.

An important feature of this invention resides in the provision of a gong, a spring biased hammer for said gong, and a hammer brake arm which is yieldingly biased out of its braking posiv tion, together with a fusible member for retaining the arm in such braking position.

Yet another feature of this invention resides in the provision of an alarm, in, accordance with the foregoing features, in which the fusible mem-, her is releasably retained in a position to hold the brake arm in its braking position, together with a means for removing the fusible member, in response to a predetermined tension applied to a cord that is attached to the fusible member.

These, together with various ancillary objects and features of the invention are attained by this device, a preferred embodiment of which has been illustrated by way of example only in the accompanying drawings, wherein:

Figure 1 is a front elevational view of the combination alarm;

Figure 2 is a rear elevational view of the alarm, with the back removed therefrom to show the details of construction;

Figure 3 is a transverse sectional view of the alarm, taken substantially on the plane 3--3 of Figure 2;

Figure 4 is a horizontal sectional view of the alarm, taken substantially on the plane 4- of Figure 2;

Figure 5 is a fragmentary top plan view of the hammer brake arm shown in hammer arm releasing position; and,

Figure 6 is an enlarged fragmentary side elevational view of a portion of Figure 3 showing the manner in which a cord is attached to the fusible member.

Reference is now made more specifically to the accompanying drawings wherein like numer- P als designate like parts throughout the various views, and in which the combined fire and burglar alarm is designated generally by the numeral [0.

The combination alarm I0 includes a spring actuated mechanism [2 which consists of fore ward and-rear mounting plates I4 and [-6 respectively, and between. which plates is rotatably j-ournaled an escapement wheel IS. The escapement wheel 18 is actuated by a main spring 28 through the intermediary of a gear train 22, which may be of any known construction, it merely being necessary to operatively connect the main spring 20 to the escapement wheel I8.

A hell or gong 24 is mounted upon the front plate M, as by the U-shaped bracket 26 which is terminally attached to the front plate, and which is attached intermediate its ends to the bell 24 as by a rivet or bolt 28. A pallet 30 is pivotally mounted between the front and rear mounting plates is and [6, for movement about an axis parallel to .the axis of rotation of the escapement wheel It, the pallet 30 operatively engaging the escapement. wheel so that upon rotation of the latter the hammer arm 32 which is attached to the pallet will be oscillated, the hammer head 34 engaging the bell 24, thereby providing an acoustical alarm.

In order to restrict actuation ofthe hammer arm 32, there is provided a brake arm 36 which has one end 38 thereof secured to the front plate 14, as by fasteners 40. A locking finger 42 is attached to the arm 35, and extends transversely thereof, which finger is adapted to move in the path of travel of the hammer arm 32, when the latter is being reciprocated by the escapement wheel I8, so as to restrict movement thereof. It is intended that the brake arm 36 be resilient, and that it normally urge the finger 42 out of the path of movement of the hammer arm 32. A transversely extending arm 44 is attached to the other end of the brake arm 36, which arm extends through a slot 45 in the rear wall 48 of the alarm casing, and which has a transversely extending finger portion 50 which is adapted to retain a fusible plug 52 such as wax or the like, between the finger portion 50 and the rear wall 48 of the casing. It is intended that the fusible block 52 be of such dimensions that when it is inserted between the rear wall 48 and the finger portion 50, that the locking finger 42 will be disposed in the path of travel of the hammer arm 32. It will thus be apparent that the brake arm 36 yield-ingly biases the fusible block 52 and retains the latter in position between the finger and the rear wall.

It is intended that a cord such as 54 may be attached to the block 52, as by insertion through a bore 66 therein, whereby the fire alarm may also serve as a burglar alarm, the cord 54 being disposed across the passageway or doorway, through which an intruder or burglar would probably pass. Obviously, when tension is applied to the cord 54, the fusible block 52 will be removed from its braking position, whereby the brake arm 36 will urge the locking finger 42 out of its hammer arm engaging position. The bell 24, and the alarm mechanism I2 may be housed in a suitable casing which includes an apertured front wall 58 having a foraminous screen 60 secured thereto, as by the annular collar 62 which is secured to the front wall by fasteners 64. Rearwardly extending side walls 66 are secured to the front wall 58, and are provided with reinforcing ribs 68, in the comers thereof, which ribs may be provided with internally threaded bores to receive the fastening screws by means of which the rear wall 48 is secured to the side walls 66 of the casing. From the foregoing, it is felt that the operation and construction of the device may be readily understood, and further discussion is therefore believed to be unnecessary. However, numerous modifications will readily occur to those skilled in the art after a consideration of the foregoing specification and accompanying drawings, it is not intended to limit the invention to that shown and described, but all suitable modifications may be resorted to falling within the scope of the appended claims.

Having described the invention, what is claimed as new is:

1. An alarm comprising a base, a spring actuated escapement wheel mounted on said base, a pallet engaging said wheel, a hammer operatively connected to said pallet for oscillatory movement in response to rotation of said wheel, a bell disposed in the path of movement of said hammer, a resilient arm having one end thereof fixedly attached to said base, a pin projecting laterally of said arm adjacent the free end thereof, said arm being movable in a plane transverse the plane of movement of said hammer and yieldingly urging said pin out of engagement with said hammer, and means including a fusible body opposing movement of said arm and retaining said pin in engagement with said hammer.

2. An alarm comprising a base, a spring actuated escapement wheel mounted on said base, a pallet engaging said wheel, a hammer operatively connected to said pallet for oscillatory movement in response to rotation of said wheel, a bell disposed in the path of movement of said hammer, a resilient arm having one end thereof fixedly attached to said base, a pin projecting laterally of said arm adjacent the free end thereof, said arm being movable in a plane transverse the plane of movement of said hammer and yieldingly urging said pin out of engagement with said hammer, and means including a fusible body opposing movement of said arm and retaining said pin in engagement with said hammer, said base including a wall disposed parallel to the plane of movement of said hammer, a relatively transverse end portion on the free end of said arm and disposed in the plane of movement thereof, said end portion slidably extending through said wall, a relatively transverse finger on the end of said end portion remote from said arm, and a fusible body disposed between said finger and said wall.

3. An alarm comprising a base, a spring actuated escapement wheel mounted on said base, a pallet engaging said wheel, a hammer operatively connected to said pallet for oscillatory movement in response to rotation of said wheel, a bell disposed in the path of movement of said hammer, a resilient arm having one end thereof fixedly attached to said base, a pin projecting laterally of said arm adjacent the free end thereof, said arm being movable in a plane transverse the plane of movement of said hammer and yieldingly urging said pin out of engagement with said hammer, and means including a fusible body opposing movement of said arm and retaining said pin in engagement with said hammer, said base including a wall disposed parallel to the plane of movement of said hammer, a relatively transverse end portion on the free end of said arm and disposed in the plane of movement thereof, said end portion slidably extending through said wall, a relatively transverse finger on the end of said end portion remote from said arm, and a fusible body disposed between said finger and said wall, said fusible body being slidably disposed between said finger and said wall, and an alarm cord secured to said body.

HAROLD C. SORENSEN.

REFERENCES CITED The following references are of record in the tile of this patent:

UNITED STATES PATENTS