US656851A - Alarm-bell. - Google Patents

Description

Patented Aug. 28, i900.

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` (No Model.)

rre Y STATES PATENT rerun.

EZRA ARTHUR NEVI'IALL, OF PORTLAND, MAINE.

ALARM-BELL.

SPECIFICATION formingpart of Letters Patent No. 656,851, dated August 28, 1900. Application filed Aprill, 190i). Serial Noi 13,048. l(No model.)

HALL, a citizen of the United States, residing at Portland, in the county of Cumberland and State of Maine, have invented certain new and useful Improvements in Alarm-Bells; and I do hereby 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 app-ertains to make and use the same.

The invention relates to alarm-bells intended for Iuse on bicycles and the like; and the object in view is to provide a bell of this description which is simple in construction and which may be rung continuously for some time by a single impulse.

The invention is illustrated in the accompanying drawings, wherein* `Figure 1 is a vert-ical central section. Fig. 2 is a plan view of the same with the crown of the bell removed, showing the cup portion and the interior works; and Fig. 3 is a side view of the cup and the bracket for securing the bell to the machine.

composed of clamping-plates 2 2, shaped to fit the handlebar or other part of the ma# chine to which the bell is to be attached. The plates 2 2 are clamped together by threaded bolts 3 3, and one end of the 'top plate is preferably provided with an extension et for a purpose which will be described later onf Rigidly secured to the top plate of the bracket and projecting vertically from the center thereof is a post d, and at the upper end of the post the crown e of the bell is se; cured in any suitable mannen` Below the crown e there is sleeved upon the post, so as turn freely, a cup b of any convenient shape and having its upper edge itting withinthe depending edge of the crown e.

. curely fastening the disk and thee up together,

In the upper part of this cup there is secured a disk d, the

so that they may be revolved together around the post d..A i

vRising from the plate d are pins or elon gated rivets p, and secured to the upper ends of these pins is another plate u2, similar to the plate d. The plate a2 is also sleeved upon the post d and being rigidly connected by the pinsp` with the plate d moves with it. Between these two plates a and a2 are mounted the train of gears c c c c2 for ringing the bell, the clapper t', and the star-wheel j, as will now bedescribed.

The post d is preferably shouldered at a point about midway of its length, and a ratchet-wheelf, with teeth pointing in one direction only, is secured in xed position upon this post. A gear-wheel g is loosely journaled upon the post below the ratchet-wheel, the latter being preferably provided with a depending hub h, upon which by means of a suitable washer the gear is held. This gearwheelis connected, by means of a spring-pawl j, with the teeth of the ratchet-wheelf7 so that the gear may revolve in one direction and be i held against revolution in the opposite di- Referring to the views, l denotes a bracket y rection. Into the teeth of the gear g meshes the prime pinion c of the train of clapperoperating pinions c c c, these pinions being mounted upon suitable pins connecting the plates d a2. The last pinion c2 of the clapperoperating train has connected to it a starwheelj, and the escapementj2 of the clappero' engages with this star-wheel in a manner common in this class of bells.

Housed within the cup b and having one end rigidly secured to the fixed post CZ is a coiled spring Z, the opposite end of which is connected to the plate d by means of a pin m, fixed to the plate. A thumb-piece a3 is secured tothe outside of the cup b for the purpose of turning it in the direction of the arrow, and a lug 5 projects from the bottom of the cup in such position as to strike against the extension 4 of the top plate 2 of the clamp and limit the turning movement of the cup inthe opposite direction.

The construction being as above described, the operation of the bell is as follows: The cup and the plates @and d2, as also the clapper t' and its train of operating-pinions c c c c2, being free to turn around the iixedpost IOO are pressed constantly in. one direction by the stress of the spring Z, one end of which is secured to lthe post, as already described, and the other end of which is xed to the plate 0i. The tension of this spring holds the cup and the pa-rts carried thereby in such position that the lug 5 on its bottom is held in contact with the stop 4C, projecting upwardly from the clamp. When it is desired to ring the bell, the cup Z7 is turned in the direction of the arrow in Fig. 2 by pressure against the thumb-piece a3. This causes the cup and the train of clapper-operating pinions and the clapper itself all to turn around the post in the same direction and tends also to turn the gear g in the same direction. Movement of this gear, however, in this direction is prevented by means of the spring-pawl j, and

the gear being thus held against movement the train of clapper-operating pinions travels around it and the clapper is operated by the consequent revolution of the pinions in a manner that is well understood. On releasing the thumb-piece a3 the pressure of the spring rotates the cup and its connected parts in the vreverse direction and restores them to their original position, with the lug 5 against the stop 4. In this movement of the parts the frictional engagement between the clapper-operating pinions and the gear g tends to carry the latter with them, and the inclination of the ratchet-teeth permits the spring-pawl to slip over them and allows the gear g to revolve backward with the train ot' operating-pinions without causing any individual rotation of the latter. derstood from this that the clapper is operated and the bell rung only when the cup is moved by pressing against the thumb-piece a3 in the direction of the arrow and that the only function of the spring is to restore the parts to their original position ready for a new impulse. It follows from this that the bell begins to ring immediately that pressure is applied to the thumb-piece and that the duration of the ring is variable and dependent lupon the extent of turning movement. It is also to be noted that the intensityof the ring and the rapidity of the strokes is dependent upon the speed with which the cup is turned. A further advantage of the construction lies in the fact that the spring has nothing to do with the operation ot' ringing the bell, but only returns the parts to their original position for a newimpulse. Thus a very light and cheap spring is suiiicient to do the work, andeven should the spring break the bell would not be inoperative, as obviously the parts could be returned to their initial position by hand.

It will be uni tively by thumb-pressure and not by the compression and release of springs; anda further advantage of the arrangement is that it permits a relatively-large multiplying gear,

as g, and a train of clapper-operating pinions which will produce a loud and continuous ring for a very small amount of movement of the thumb-piece.

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

l. In 'an alarm-bell for bicycles and the like, the combination of the crown, a fixed post, aratchet-wheel secured to the post, a gear-wheel journaled on the post, a plate carrying a clapper and pinions meshing with said gear, and a spring tending to revolve the plate, the gear and the pinions in one direction, the gear having a pawl engagement with the ratchet, whereby it will be held stationary by the ratchet when the spring is wound up, but will revolve with the pinions around the ratchet when the spring is released.

2. In an alarm-bell for bicycles and the like, the combination of the crown, a xed post, a ratchet-wheel fixed to the post, a gearwheel journaled on the post, a cup under the crown, a clapper and Voperating-pinions carried by said cup, connections between said ratchet and gear to hold thelatter stationary and cause the pinions and clapper to operate when the cup is manually turned, and a spring for returning the parts to their normal position.

3. In an alarm-bell for bicycles and the like, the combination of the crown, a xed post, a ratchet-wheel secured to said post, a gear-wheel journaled on the post, a cup under the bell having a thumb-,piece connected thereto, a clapper and train of operatingpinions carried by the cup and connected to the gear, a pawl connection between the ratchet and gear to hold the latter fixed when the cup is manually rotated, and a spring for returning the parts to their normal position.

4. In an alarm-bell for bicycles and the like, the combination of the crown, a ixed post, a ratchet-wheel secured to the Post, a gear-wheel journaled on the post and having a spring-pawl connecting it with the ratchet-wheel, a cup under the bell having a thumb-piece for turning it in one direction around the post and a spring for returning it to position, a fixed stop against which the spring holds the cup, a plate or frame se- IOO IIO

cured to the cup and carrying a clapper and y

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