IMPROVED APPLIANCES FOR CHECKING AND STOPPING BODIES MOVING IN A RECTILINEAL ROTARY OR OTHER DIRECTION AND PREVENTING THE RATTLING OF WINDOWS AND DOORS
Year: 1885

page_text: 1 WALTER PFEFFER DANDO of 38 Marquess Road Canonbury in the County of
Middlesex India Rubber Spring and Chest Expander manufacturer do hereby
declare the nature of my invention for IMPROVED APPLIANCES FOR CHECKING AND
STOPPING BODIES MOVING IN A RECTILINEAL ROTARY OR OTHER DIRECTION AND
PREVENTING THE RATTLING OF WINDOWS AND DOORS to be as follows:-
=
My Invention consists of two parts The first an improvement in the construction
of cams or excentrics, which I bring to bear upon objects moving in any direction,
for the purpose of checking or stopping the movement of same. Which improvement
consists of constructing excentric cams of a combination of vulcanisable compounds,
(by preference India Rubber) of two opposite characters, one portion being hard to
resist wear and the other soft and elastic The simplicity of inanufacture is one of
the great improvements in these cams or excentrics, as I can easily form or mould
them into any size or shape from two distinct homogeneous vulcanisable compounds
when in a pliable state, which upon being vulcanised will present two distinct
properties, yet forming one solid piece. I also serrate or give a rough edge to the
cams, that they may more readily grip or stop the moving body, when brought to
bear upon it. The degree of hardness, or elasticity will depend upon the purpose
for which the cams are needed as will also the size. These antielastic cams will be
of great utility for the purpose of checking and stopping Rotating bodies, by being
fixed so that the cams or excentrics will always present an edge with a variable
distance from its working centre or hole, and it will be readily seen that by friction
the cam will be drawn into a position that will cause it to jamb or grip the rotating
body and check or stop its movement. The action would be the same in the case
of an object working or moving in any other than a rotary direction.
The second part of my invention consists of employing cam or excentric shaped
appliances made from Metal Wood India Rubber or any other suitable materials
for the purpose of stopping or preventing the rattling noise of shaking windows
or sashes, doors or movable partitions. The excentric appliances are to be made
of a size and shape suitable for the window or door to which they are to be applied,

page_text: As an example of the way I use these excentric appliances for the purpose specified.
If I tako a disc of India Rubber Metal or other material or a combination of
same, with a hole made at any point from the centre, so that the appliance presents
an outer edge with a variable distance from its working centro, and fix same by a
screw or nail to the bead or woodwork at the side of the window, that upon the
cam being pressed against the window sash or drawn into position by the act of
closing the window, it will force the window sash against the opposite bead or
woodwork and hold the window in position and prevent any rattling noise caused
by the wind or vibration of travelling, and with the great advantage, that the act
of opening the window will cause the cam or excentric appliance to be immediately
thrown or lifted out of use thus preventing unnecessary wear. The excentric
appliance can be sorrated or present a rough edge that it may more readily hold or
catch the object to be checked or stopped.

page_text: I WALTER PFEFFER DANDO of 38 Marquess Road Canonbury in the County of
Middlesex India Rubber Spring and Chest expander manufacturer do hereby
declare the nature of my invention for IMPROVED APPLIANCES FOR CHECKING AND
STOPPING BODIES MOVING IN A RECTILINEAL ROTARY OR OTHER DIRECTION AND
PREVENTING THE RATTLING OF WINDOWS AND DOORS and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement:-
My invention to be rightly understood and to plainly show what I claim as the
novelty of my invention I divide into two parts which are fully described as
follows The first part of my invention consists of improvements in the construction
of cams or excentrics which I bring into use for the purpose of checking or stopping
objects moving in a Rectilineal Rotary or other direction or for the purpose
of preventing the rattling of windows doors or movable partitions, which im-
provements consists of constructing the cams or excentrics of a combination of
vulcanisable compounds (by preference India Rubber) of two opposite characters
or qualities, one portion being hard to resist wear by friction, the other soft or
elastic that it may more readily produce the required effect without the dis-
advantage of being subjected to wear The simplicity of manufacture is one of the
great advantages of my invention as the cains or excentrics can be readily moulded
or formed any desired size or shape from two distinct homogeneous vulcanisable
compounds when in a pliable or plastic state, which upon being vulcanised will
present two distinct properties or characters as described, yet forming one solid
piece, as if the cam or excentric had been made from one individual piece of
vulcanisable compound. I also serrate or give a rough or other desirable form of
edge to the cams or excentrics, that they may more readily grip or stop the body
when brought to bear upon it for the purposes described. The particular hardness
of the one part and the elasticity of the other part of these cams or excentrics will
depend entirely upon the purpose for which they are needed. They can be con-
structed from the hardest vulcanite in combination with the most elastic vulcanised
India Rubber and vary to any degree of elasticity or hardness as required. The
exact size will also be governed by the purpose for which these antielastic cams are
needed. The hole or working centre which converts an ordinary disc into a cam
or excentric can only be determined by the size and thickness they are required,
and the purposes to which they are to be applied, but can be placed at any point
from its actual centre, according to the degree of graduation that it is desired to
give the cam or excentric, the nearer the hole is to the actual centre of the disc the
more gradual will be the excentric movement, and the nearer the hole is to the
outer edge of the disc the more sudden will be the action of the cam The proportion
and position of the hard and soft vulcanisable compounds which forms these cams
will be regulated according to the amount of power they will have to sustain, and
the parts that will be subjected to the most friction and wear.

page_text: The principle of this part of my invention is the producing in one perfect piece,
an antielastic excentric appliance as described with a periphery of a variable
distance from its working centre or hole placed either in the hard or soft portion of
the vulcanisable compound and bushed with an eyelett of metal according to
circumstances for the purposes described.
These antielastic cams or excentric appliances would be of great utility for the
purposes specified in the title and the method of fixing them is very simple, and
will be readily understood by the following short explanation.
For the purpose of checking or stopping rotating bodies, I fix the cams either in
a single or multiplex form, so that they will present their outer edge or periphery 1
with a variable distance from their working centre, hole, or fixing to the periphery
of the rotating wheel, that I desire to check or stop and that my invention may be
more clearly understood I have illustrated it in the annexed drawing.
Fig 1 represents an antielastic cam B, brought to bear upon a wheel A revolving
in the direction indicated by the arrow, the antielastic cam B illustrates a com- 1
bination or junction of two kinds of India Rubber, vulcanised into one solid piece
the shaded portion being of the harder kind to resist the wear and the portion left
white in the drawings is of the soft or elastic kind of India Rubber, the antielastic
cam B moving freely upon its working centre or hole C, will rest upon the rotating
wheel A without in any way impeding its rotary action as indicated by the arrow,
but upon the wheel A reversing its rotary direction as show in Fig 2 and indicated
by the arrow the cam B would be immediately drawn into use and stop and hold
the wheel A. by friction The cam B Fig 2 is a slightly different form to that
illustrated in Fig 1 marked B.
In the junction of the two kinds of vulcanisable compounds shown in the cam B.
Fig 2 the shaded portion is of the harder kind, and the unshaded portion the more
elastic kind and the working centre or hole C in this instance is bushed with an
eyelett of metal as shown, this is a simple and less expensive form of cam than B.
Fig 1. but I do not confine myself to either of these proportions of vulcanisable
compounds nor the configurations shown. It will be seen that the cam, B, would
be brought into action automatically by friction and stop the wheel A rotating in
the direction indicated by the arrow Fig 2. If the weight of the cain B should not
be sufficient to keep saine against the rotating wheel A a light India Rubber
spring D Fig 1 or a spiral metal spring D Fig 2 may be used to keep the cam
against the rotating wheel that it may with more certainty grip and hold the
object it is desired to stop The edge of the cams can also be serrated as shown
at B. Fig 2 if neccessary.
The action of the antielastic cams as illustrated in Figs 1 & 2 is almost identical
with the action of the pawl and rachet wheel only with the advantage that the
antielastic cams work perfectly noiseless and the rotating wheel it is desired to
check or stop need not be a rachet wbeel.
The antielastic cams or excentrics can also be used for the purpose of stopping
bodies that are rotating only in the direction shown in Fig 2 and indicated by the
arrow, in which case the antielastic cams would be fixed as illustrated by Fig 1 & 2
but would have to be kept away from the rotating wheel by any simple means
until the moment the rotating wheel is desired to be stopped, when it would be
released, and allowed to fall into use as illustrated.
The action of the cam would in this instance be very sudden but sure and
applicable to a variety of useful purposes, and as a safeguard against accidents
where it is desired to suddenly stop the motion of any rotating object.
The action of the antielastic cams and the mode of fixing same is equivalent to
that illustrated by Fig 1 & 2 in bringing them into action against bodies moving in
any other than a rotary direction for the purpose of checking or stopping same.
Care must be taken in fixing the cams or excentrics for any of the purpose
described that the working centre or hole is fixed in such a position, that the
periphery of the cams will allow same to always present an edge to the object it i
desired to check or stop with a variable distance from its working centre or fixing

page_text: in fact carry out the principle of the excentric care should also be taken that the
cams work freely upon their working centres If necessary I can make the cams
or excentrics from more than two distinct kinds of vulcanisable compounds or
India Rubber and graduate them in this way to the greatest nicety from a perfectly
hard to the softest kind of India Rubber, and for very special purposes have found
this gradual combination very useful and work admirably, but for ordinary use and
domestic purposes I have found the junction of two characters of India Rubber the
most inexpensive and answer every purpose.
The second part of my invention, consists of the novel application of cams or
excentric shaped appliances made from wood metal India Rubber or other suitable
material or compound or a combination of the same, for the purpose of stopping
and preventing the rattling noise of shaking window sashes doors or movable
partitions The excentrics are to be made of a size & shape most suitable to the
window or door to which they are to be applied, and I have found for ordinary
windows a cam of the antielastic kind, about one inch in diameter and about three
sixteenths of an inch wide with the working hole or centre about one quarter of an
inch from the periphery and punched out or moulded in the harder portion of the
two vulcanisable compounds and bushed with a metal eyelett if necessary to work
admirably for ordinary house windows and the size would be regulated in pro-
portion larger or smaller according to the size of the window or door it is desired
to prevent shaking. I fix the same either singly or in a multiplex form by a screw
or nail to the bead or woodwork at side of window frame and it will be readily
understood that upon the excentric appliance being pressed against the window
sash or drawn into position by the action of closing the window the excentric
appliance will force the window sash or door against the opposite bead or wood-
work and hold the window in position and prevent any rattling caused by the
wind or vibration of travelling and with the great advantage that the mere act of
opening the window will cause the excentric appliance to be immediately thrown
or lifted out of use and thus prevent unnecessary wear, or the excentric appliance
can be put in or out of use at will by the action of the fingers The excentric
appliances may be made with a serrated or rough edge that they may be more
readily drawn into use and grip the window or door.
To more fully explain and illustrate the working of these excentric appliances
for this particular purpose in which Fig 3 represents the excentric of the antielastic
kind marked B in use against a window frame A for the purpose described. The
excentric B is of the simplest and cheapest form of the combination of hard and
soft India Rubber fixed by a nail or screw through its working hole C to the bead
or woodwork at side marked D care being taken that the excentric B works freely
upon the nail or screw and as shown in the illustration has a serrated edge to
O insure its grip against the window.
I do not confine myself to the antielastic cams for the purpose of checking and
preventing the rattling of windows or doors but make them from metal or other
suitable material I have found brass make a very servicable and inexpensive
excentric attachment, and this form of domestic application of excentrics can be
5 made ornamental and more pleasing in form than the antielastic kind, and can be
readily stamped or pressed from the solid sheet metal at a very cheap rate or they
can be cast in any desirable form, which may be varied according to taste but I do
not confine myself to any particular configuration or shape my invention being for
the application of an excentric appliance or attachment for the purpose described.
Instead of fixing the excentric to the bead or woodwork at the side of window,
which would only prevent the rattling of one window sash I can fix same upon
the top of the lower window-sash and bring the excentric to work against the
upper window sash in which case it will stop the rattling of both windows with
the one excentric appliance The construction of the excentrics and the form of
5 same would not be effected in the least, but there would have to be a small
additional L. Bracket to fix on the top of the lower window sash and to which the

page_text: excentric would have to be attached arrangement being made for the excentric to
work freely upon its working centre or hole when attached to the small L-Bracket.
To facilitate the understanding of this kind of excentric and its appliance to the
purpose specified I have illustrated same in the annexed drawings of which Fig 4
represents at A. the lower and upper window sashes, B is a simple form of metal
excentric and C a small bracket to which the excentric is attached, which bracket
can be fixed by two ordinary screws to the lower window frame as shown the
excentric working as described on a small stud or other suitable attachment at D
It will be readily seen that by pressing the excentric B down against the upper
window sash A. it will force the two sashes A. A against the bead or wood work E
in which they work and jamb them against same and thus prevent any rattling
and would also act as a security against any one opening the windows either top
or bottom from the outside, but the excentric could be easily lifted out of use when
desired from the inside.
I do not confine myself to this particular construction of metal excentric
appliance in combination with the bracket for the purpose described My object
will be to get the most inexpensive form of. excentric on the principle substantially
as described with a regard to its being ornamental' as well as useful.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed I declare that what
I claim is
1st The construction of excentrics or cams from a combination of vulcanisable
compounds of distinct characters or degrees of elasticity for the purpose of checking
and stopping bodies moving in a rectilineal rotary or other direction substantially
as described.
2nd The application of excentrics or cams made from metal wood India Rubber
or other vulcanisable compounds or a combination of same for the purpose of
stopping the rattling of windows or doors substantially as described.
Dated this Thirtieth day of May One Thousand eight hundred and eighty five.