Year: 1888

page_text: I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex M.I.M.E.
do hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement :-
This invention relates to an improvement in door bells and alarms and it consists in
certain peculiarities of the construction and arrangement of the same, substantially as
will be hereinafter more fully set forth.
In order to enable others skilled in the art to which this invention pertains to make
and use the same, I will now proceed to describe its construction and operation,
referring to the accompanying drawing, in which:
Figure 1 is a back view with the plate of the casing removed.
Figure 2 is a cross sectional view.
Figure 3 is a detail view of the push button, rod, and push bar.
Figure 4 is a detailed view of the hammer and stem and connection.
A is a section of the panel or other part of a door or a door jamb. B is a box or
casing which may be screwed to the door A. C is a bell supported upon the arm c of
the casing. D is the bell hammer, E the hammer stem which is pivotted at e to
brackets on one of the side plates F of the train of wheelwork. G is a cam disc with
a corrugated edge. H is a short arm pivotted on the lower end of the hammer stem E.
h are two anti-friction rollers, one on each end of arm H. These rollers embrace the
corrugated edge of the cam disc G, so that the latter by its revolution will vibrate the
hammer stem. The arm H by rocking on its pivot conforms to the corrugations of
the disc and the rollers prevent friction. The motion of the disc is thus perfectly
fran and ance

page_text: is a lug against which the hammer stem strikes just before the hammer reaches
the bell, the remainder of the hammer's stroke is made by the spring of the stem and
the momentum of the hammer. The hammer therefore springs back from the bell the
instant the blow is given thus leaving the bell free so that it will emit a clear ringing
sound. The lug 1 also takes the strain of vibration off the cam and relieves the pivot
of the hammer stem. J is a similar lug on the other side of the hammer stem from
lug 1, against which the hammer stem impinges on its backward stroke. K is a
pinion on the cam disc or lar, L is a gear wheel meshing therewith and M is n pinion
on the arbor of the wheel N is a rack or push bar which meshes with pinion M
and whose reciprocation drives the train and rings the bell,
The bar being kept in position by the teath thereof meshing squarely with the teeth
of the pinion. The rack is constructed by taking a round bar and cutting away a
portion of it, leaving the teeth as is apparent in Figure 2.
By using a round lar N, its hearings can be forined in the casing B, by simply
boring holes of suitable size and save the labor and expense incident to making holos
of another shape. O is a flat head on the end of the bar N. P is a push button
casing and Qa push-button therein. It is a rod one end of which is rigidly
secured in the push button Q, and the other fits and serows snugly in a hollow in
the push lar N, so that by simply turning the push-button, the push har and button
are adjusted to and from each other, so that any thickness of door is accomodated
as shown in Figure 3. S is a spring bearing against the head of the push bar and
returns the lar and button to their normal positions.
By this means in applying the invention to a door the parts can be placed in position
on the door and it can be observed how much the bar N is out of position and the same
adjusted by turning the push button.
X is a rim or flange which forms a part of the casing and fits in the hole bored in
the door, thereby contreing the push bar, spring and push button so that they work in
the centre of the hole free from friction.
In the drawings the lugs I and J are shown as two sides of the opening in the case,
the sides of the openings being the same as lugs, or the lugs can be provided as
dosired.
Having now particularly described and ascertained the nature of this said inven-
tion as communicated to me by my foreign correspondent and in what manner the
same is to be performed, 1 declare that what I claim is :-
1. The combination substantially as set forth of the hell, its hammer, the bammer
stem, a cam to vibrate the hammer, and stem and the lug I against which the hammer
stem impinges just before the hammer strikes the boll.
2. The combination substantially as set forth of the bell, its hammer, the hammer
stem a cam to vibrate the hammer and stom and the lugs I and J, between which the
hammer stem vibrates.
3. The combination substantially as set forth of the holl, its hammer, the hammer
stem, the disc cam with a corrugated edge and the arm 1 pivotted to the hummer
stem and carrying the friction rollers to embrace the cam edge.
4. The round push bar N having round bearings to guide it and the rack teeth on
it to drive the train mechanism and to hold the bar in position, substantially as set
forth.
5. The push bar N extending through a guide hole in the casing B, and having its
end flush thorewith when at the limit of its backward motion substantially as and for
the purpose set forth.
6. The round push har N, having round boarings to guide it, the rack teoth on it to
drive to train mechanism, and the Hat head on one end of the bar in combination with
the push button and the rod R, the rod adjustably connecting the button and the push
bar, substantially as shown and described and for the purpose set forth.
7. The combination of the round push har N, having the rack teeth, and flat head,
the push button, the rod R, adjustably connecting the push button and the push bar,

page_text: and the casing B, having a guide hole through which the push bar moves and whose
end is flush therewith when the parts are normally at rest substantially as shown and
described for the purpose set forth.
8. The rim or flange X in combination with the casing and door, whereby the push
bar, spring and push button are centred and friction avoided substantially as shown
and described and for the purpose set forth.
9. The complete bell or alarm substantially as herein described and illustrated in
the accompanying drawings.