Improvements in Mechanism for Retaining Carriage Windows at any Height to which they may be Raised or Lowered.
Year: 1886

page_text: Date of Application, 19th May, 1886.
Complete Left, 17th Feb., 1887.
Complete Accepted, 17th May, 1887.
Improvements in Mechanism for Retaining Carriage Windows
at any Height to which they may be Raised or Lowered.
I, ARTHUR COOE HATTATT of Amherst Villa, Castle Road, Newport, Isle of Wight
Gentleman do hereby declare the nature of this invention to be as follows:-
This Invention has for its object improvements in mechanism for retaining carriage
windows at any height to which they may be raised or lowered.
For this purpose I provide the window sash with catches at its side edges to project
from it and engage with toothed racks fixed in the grooves in which the window slides
and at the centre of the upper horizontal bar of the window sash and just above the
handle which commonly projects from it I provide a thumb piece by the depression of
which the catches can be withdrawn and the window thereby set free to be raised or
lowered.
In this way the catches can be disengaged and the window raised or lowered with
one hand only.
The withdrawal of the catches by the depression of the thumb piece I effect
preferably in the following manner.
The thumb piece I form at the end of one arm of a lever the other arm of which
acts at its end against another lever arm which turns on a pivot near to one side edge
of the window frame and which at this point is formed with a pawl or tooth standing
out from it to project from the side edge of the frame and engage with the fixed
toothed rack at all times except when the thumb piece is depressed. The turning
outwards of the catch may be effected by the weight only of the lever arm or if
desired a spring may be used in addition.
A similar set of levers is provided for actuating the catch at each side of the
window. One thumb piece only is used but when depressed it acts upon both sets of
levers.

page_text: The teeth of the racks may be formed like ratchet teeth with the flat face of each
tooth uppermost-in this case the window can be raised without its being necessary to
previously depress the thumb piece it being only necessary to withdraw the catches
before lowering the window. Or the teeth or projections of the racks may be of a
dovetail form and the end of the catches be formed to engage with them not only to
stop the window from being lowered but also to prevent the window from being raised
unless the thumb piece be first depressed.
All the levers may be placed inside the window frame or they might be outside
with a cranked or bent connection to the catches. In place also of using catches to
engage with fixed toothed racks eccentrics may be used which by the weight of the
window are caused to jam against metal plates fixed in the guides in which the
window slides.
TL 10
CA 1000

page_text: CUBIT DELE DI MUIFICATION.
Improvements in Mechanism for Retaining Carriage Windows
at any Height to which they may be Raised or Lowered.
I, ARTHUR COOE HATTATT of Amherst Villa, Castle Road, Newport, Isle of Wight,
Gentleman, 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 has for its object improvements in mechanism for retaining carriage
windows at any height to which they may be raised or lowered.
For this purpose I provide the window sash with catches at its side edges to project
from it and engage with toothed racks fixed in the grooves in which the window slides
and at the centre of the upper horizontal bar of the window sash and just above the
handle which commonly projects from it I provide a thumb picce by the depression of
which the catches can be withdrawn and the window thereby set free to be raised or
lowered.
In this way the catches can be disengaged and the window raised or lowered with
one hand only.
The withdrawal of the catches by the depression of the thumb piece I effect
preferably in the following manner :-
The thumb piece I form at the end of one arm of a lever the other arm of which
acts at its end against another lever arm which turns on a pivot near to one side edge
of the window frame and which at this point is formed with a pawl or tooth standing
out from it to project from the side edge of the frame and engage with the fixed
toothed rack at all times except when the thumb piece is depressed. The turning
outwards of the catch may be effected by the weight only of the lever arm or if
desired a spring may be used in addition.
A similar set of levers is provided for actuating the catch at each side of the
window. One thumb piece only is used but when depressed it acts upon both sets
of levers.
The teeth of the racks may be formed like ratchet teeth with the flat face of cach
tooth uppermost in this case the window can be raised without its being necessary to
previously depress the thumb piece it being only necessary to withdraw the catches
before lowering the window. Or the teeth or projections of the racks may be of a
dovetail form and the end of the catches be formed to engage with them not only to
stop the window from being lowered but also to prevent the window from being raised
unless the thumb piece be first depressed.
All the levers may be placed inside the window frame or they might be outside with
a cranked or bent connection to the catches. In place also of using catches to engage
with fixed toothed racks eccentrics may be used which by the weight of the window
are caused to jam against metal plates fixed in the guides in which the window slides.
Figure 1 of the drawings hereunto annexed shows a front view of the upper part

page_text: of a carriage window with mechanism such as herein before described applied to it.
Figure 2 is a similar view with the front by which the lever mechanism is enclosed
removed. Figures 3, 4 and 5 show separately a side view, end view and plan of one
of the lever catches.
A, A, are the lever catches one at either end of the upper horizontal bar B of the
window sash. The pins upon which these levers turn are at their ends screwed into
metal plates secured to the sash as shown or in other convenient way.
Each catch has an arm A¹ extending from it which at its end comes above the end
of one arm of a lever C, the weight of the arm causes the catch to protrude from the
sash and engage with a toothed rack D which is fixed in the groove in which the sash
slides, the other arms of the levers C come together at the centre of the bar B and
one passes under the other. The upper one has a thumb piece E secured to it so that
by pressing on this thumb piece both levers C can be turned on their axes and both
catches A be thereby withdrawn within the sash frame and disengaged from the
racks D. F is a plate of thin metal by which the recess in which the levers lie is
closed in. When the catches and racks are formed in the manner shewn in the above
figures the window sash can be raised by the usual projecting handle or finger ledge G
but can only be lowered when the thumb piece E is pressed downwards. H is a thumb
plate guard to prevent the thumb plate from being pressed on accidentally.
At figure 6 one of the lever catches A and the rack with which it engages are
shewn formed in such a manner as to lock the window sash and retain it from being
either raised or lowered unless the catches A be first disengaged by pressing on the
thumb piece E.
Figure 7 shews one of the catches with its arm A¹ acted on by a spring H so that
the catch is not only turned outwards from the sash by the weight of the arm A¹ but
also by the action of the spring.
Figure 8 shews one of the arms A¹ formed with an eccentric I at its end in place of
a toothed catch.
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 :-
1. The mechanism substantially as hereinbefore described for retaining carriage
windows at any height to which they may be raised or lowered.
2. The combination of the thumb piece E levers C and lever catches A¹ A to engage
with racks D substantially as described.
3. The combination of the thumb piece E levers Clever arms A¹ and eccentrics I
substantially as described.
Dated this 16th day of February 1887.
CARPMAEL & Co.,
Agents for the Applicant.