US515991A - bradley - Google Patents

Description

(No Model.)

ofs. BRADLEY. ALARM BELL.

No. 515,991. Patented Mar. 6, 1894.

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lhvi'rnn STATES CHARLES S. BRADLEY, OF PORTLAND, OREGON, ASSIGNOR JOHN T. STONE, OF SAME PLACE.

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'ro HIMSELF AND ALARM-BELL.

$PECIFICATION forming part of Letters Patent No. 515,991, dated March 6, 1894. Application filed August 17 1893- Serial No. 483i37 (N0 l- To (tZZ whom it may concern:

Be it known that I, CHARLES S. BRADLEY, of Portland, in the county of Multnomah and State of Oregon, have invented a new and useful Improvement in Alarm-Bells,of which the :Eollowing is a full, clear, and exact descripion.

My invention relates to an improvement in alarm bells, and it has for its object to provide a bell capable of use as a merchants call hell, or as a burglar alarm, or for like purposes, the bell being so constructed and capable of being so attached to'a door or like object that when the door is closed the drivmg mechanism of the bell will-be automatically wound, and whereby the moment the door is opened the striking mechanism will be set in operation, also automatically.

A further object of the invention is to provide an alarm bell which need not be wound by hand at any time, and which will be at all times ready for use.

Another feature of the invention is to provide a bell of the character above set forth which will necessitate but few working parts, and wherein the said parts will be simple and durable in construction, rendering the bell exceedingly economic.

The invention consistsin the novel construction and combination of the several parts, as will be hereinafter fully set forth and pointed out in the claims.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar figures and letters of reference indicate corresponding parts in all the views.

Figure 1 is a horizontal section through a portion of a door and door jamb, the door being closed; said figure also illustrates the application of the improved bell to the door. Fig. 2 is a section taken practically on the line 2-2 of Fig. 3, illustrating the operative mechanism of the bellin plan. Fig. 3 is a section through the bell and base plate, said section being taken on the line 3-3 of Fig.2, the operative mechanism being shown in elevation, with the exception of the plunger, which is in section; and Figs. 4 and 5 are detail views of the bell, Fig. =l representing a stop mechanism and Fig. 5 the striking mechanism.

What may be termed the framing of the bell consists of a back plate A and a front plate B, the front plate being centrally located with respect to the back plate, and it is of much less diameter than the back plate. The back and front plates are properly spaced through the medium of connecting posts 10, and usually the front plate is provided with a bracket or extension B, upon which bracket or extension the hell or gong1l,is secured in any suitable or approved manner, the hell or gong being made at its margin to somewhat closely approach the back plate. The back plate is provided with lugs 12, located near one another, but between the lugs a recess 13, is made. The lugs are bent practically at an angle to the back plate and the back plate is adapted to be secured to the inner side of a door C, as shown in Fig. 1, the lugs 12, being made to firmly engage with the inner edge of the door, or that opposite the jamb 0' upon which the door is swung; and when the door is closed the lugs on the back plate will be between thedoor and the jamb, and recesses 14, may be produced in the jamb, to just reoeive the lugs when the door is closed.

The hammer usually comprises two links, an outer long link 15 and an inner short one 16. The inner link is secured upon a spindle 17, journaled between the front and back plates, which spindle is provided with a pinion 18. The longer link is pivotally attached to the shorter one, and is provided at its inner end with a spur 15, which when the links are swung in one direction will engage with the spindle and maintain the two links in longitudinal alignment. When however, the spur is not brought in engagement with the spindle one link can turn upon the other. The longer link 15, is usually provided with a knob 19 at its outer end. The striking pinion 18 on the striking spindle is made to mesh with a gear 20, mounted to turn between the front and back plates, the gear having secured to it a pinion 21; and the pinion 21 meshes with a second gear 22, likewise held to turn between the front and back plates, the said second gear being provided with a pinion 23. This pinion 23, meshes with a master gear 24, the said master gear being loosely mounted upon a post 25, said post extending. from the front to the back plate; and the master gear is provided upon one of its faces with a spring-pressed pawl 26, and the said pawl is held constantly in engagement with a ratchet wheel 27, located on the post 25, and the post adjacent to the ratchet wheel has projected from it an arm 28, and the said arm is attached to a spring 29, the spring being secured at one end to the backplataasshown in Fig.2. The tendency of the spring is to hold the ratchet wheel against the pawl, and in the event the arm 28, is forced'in one direction the spring 29 will be put under tension and the ratchet wheel will be turned a certain number of teeth, and upon the arm 28 being released the spring will restore the arm to its normal position, and in so doing will turn the master wheel and likewise the entire train of gearing connecting the master wheel with the striking pinion on the striking arbororspindle, and therefore the striking links will be revolved and will be brought into engagement with the gong and sound an alarm. The length of time the alarm will be sounded under ordinary circumstances will be equivalent to the time occupied by the spring in reaching its normal position.

The spring 29 is brought under tension through the medium of a plunger 30, said plunger being held to slidein suitable guides upon the inner face of the back plate, and the said plunger is made to pass over the recess 13 in the back plate, and the plunger is provided in its outer end with a head 31, extending in the same direction as the lugs 12 of the back plate. The inner end of the plunger is provided with a slot 32, through which slot the post 25 upon which the master wheel is mounted is passed. The plunger is provided at its inner end with two pins 33 and 34, located at opposite sides of the arm 28.

In operation when the bell is secured to a door, and the door is closed as shown in Fig. 1, the plungei' will be pressed inward, and the shaftor post of the master wheel ivill be turned and the spring 29 placed under tension; the parts will be held in this position until the door is opened, as shown in dotted lines in Fig. 1, and at that time the head of the plunger being released, the spring will force the plunger outward, and in restoring the plunger to its outer position will revolve the post 25, and therefore turn the chain of gearing communicating with the striking arbor and cause the striker arms or links to move, as shown in Fig. 5. Thus at each time that the door is opened an alarm will be antomatically sounded, and each time the door is closed the mechanism of the gong oralarm will be wound or placed in operative order simultan eously, and at no time is it necessary to wind the mechanism by hand.

In the event the alarm is not needed alock lever 35 pivoted upon the back plate may be brought to an engagement with a notch 36, produced in the plunger, the lever engaging with the notch'when the plunger is in its 1nner position, and a series of graduated notches may be produced in the plunger, as shown in Fig. 4., in order that by engaging the lever with certain of the notches the outer movement of the plunger will be limited, and consequently the duration. of the alarm may be varied.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In an alarm bell, a gong, a hammer adapted for contact with the gong, a master wheel, a train of gearing connecting the master wheel and hammer, a spring-pressed winding arm, and a plunger operating said arm when moved in one direction and releasing the arm when moved in an opposite direction, substantially as shown and described.

2. In an alarm bell, the combination, with a gong or like alarm, a hammer adapted for engagement with the gong, a master wheel, and gearing connecting the master wheel with the hammer, of a spring-controlled winding mechanism connected with the master wheel, a plunger operating the winding mechanism when moved in one direction, and means, substantially as shown and described, whereby the winding mechanism and plunger move 7 in unison both at the winding and the unwinding of the mechanism, as and for the purpose specified.

3. In an alarm bell, the combination, with a gong or other bell, a hammer, a master wheel, and a train of gearing connecting the hammer with the master wheel, of a springcontrolled winding mechanism connected with the master wheel, a plunger operating upon the winding mechanism, said plunger being capable of sliding movement and of being operated upon by the winding mechanism, and a stop whereby the outward movement of the plunger may be limited, as and for the purpose specified.

4. In an alarm bell, the combination, with a door or like object and the jamb upon which the door is hung, of a bell provided with a winding mechanism, a hammer, a connection between the winding mechanism and the hammer, and a plunger operating upon the winding mechanism and having movement to and from the mechanism, the plunger being provided with a head located between the door and the jamb, whereby when the door is closed the plunger is pushed inward and the winding mechanism is wound, and when the door is opened the plunger is released and acted upon by the winding mechanism, simultaneously with its operation upon the hammer, as specified. CHARLES S. BRADLEY.

lVitnesses:

S. H. HAINEs, T. O. HUMPHREY.

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