Improvements in Type Writing Machines.
Year: 1896

page_text: Date of Application, Eth Sept., 1896-Accepted, 7th Nov., 1896
[Communicated from abroad by WELLINGTON PARKER KIDDER, of Robeson Street,
Jamaica Plain, in the City of Boston, County of Suffolk and State of
Massachusetts, United States of America, Mechanical Engineer.]
Improvements in Type Writing Machines.
I, WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45 Southampton Buildings, in the County of Middlesex, 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:-
My invention is an improvement in typewriters of the end-thrust type-bar class.
The object of my invention is to produce an approximately noiseless or silent
typewriting machine and also one in which the impression is given by a dwelling
pressure rather than by a quick, sharp blow.
In the accompanying drawing
Figure 1 is a side elevation illustrating my new key action, when provided with
combined toggle and cam, the parts being in their position of rest.
Figure 2 is a similar elevation showing the key depressed and type at impression
point.
Figure 3 is a plan of a swinging arm forming a portion of my new action.
Figure 4 shows a modification.
16 represents a key, and 17 a link connecting the end thrust type 18 with the
swinging lever 19 which is pivoted at 20 to a bracket 21 secured on frame 22.
Bracket 21 is provided with an extension 23, to which cam-roll carrier 24 is pivoted
at 25. Carrier 24 is provided with a cam-roll 26 moving in the cam-path 27, with
which lever 19 is provided. A portion 28 of the cam path is on a radius with the
centre 25, in which position the toggle is exactly on the centres (see Figure 2).
A link 28 connects the cam-carrier 24 with the key lever 16, being pinned to the,
carrier 24 and key lever at 29 and 30 respectively. A returning spring 31 is
interposed between swinging lever 19 and the frame of the machine in any suitable
manner, as will be plain to all skilled in the art without more particular description.
Any suitable arrangement of platen P and type-har guides G may be employed.
But it is of the greatest importance that portion G' of the guide should be of such
construction that the type-carrier is compelled to move, immediately prior to
actual impression, straight towards the platen, and that the type-carrier be held
unwaveringly, at its type end, during actual impression.
When the key-lever is depressed, swinging-arm 24 pulls upon swinging-lever 19
against the tension spring 31, and cam roll 26 is caused to traverse cam-path 27
into the position shown in Figure 2, at which time the toggle is on its centres,
the link 17 thus pushing the endwise moving type-bar into its printing position.
The parts are returned to position by spring 31, the heel of the type-bar striking
against a soft pad 32 on its return. The marked advantages of this movement are
that the toggle is brought on its centres with multiplied power as the cam roll 26
traverses the inclined plane of its cam path; that the toggle is brought positively
to its exact centres without the concussion of any part with a stop; that as the
toggle approaches its centres, the velocity is gradually diminished until the parts.
reach a full stop,-that is, until the type-bar reaches the impression point, so that
the type are brought to the paper practically without any noise whatever.
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page_text: In Figure 4, showing a modification, the key-lever is provided with an arm a
provided with a cam-roll a' which works in a cam-way a formed in the swinging-
fever 4 which is pivoted in any suitable manner.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be perforined, as communicated to me by my
foreign correspondent, I declare that what I claim is :-
First. In a type-writing machine, the combination of a platen; a type-carrier;
a key for straightening the toggle; a toggle connected with the type-carrier; and,
while straightening, pushing the type to impression; cam mechanism connecting
the toggle and key, whereby movement of the key causes the cam mechanism to
bring the toggle substantially on its pivots, the pivots of the toggle being substantially
in one and the same line with each other at the instant of impression to print
by pressure without concussion, all substantially as and for the purpose set forth.
Second. In a type-writing machine, the combination of a platen; a type-carrier;
a key for straightening the toggle; a toggle connected with the type-carrier and
while straightening, pushing the type to impression, cam mechanism connecting the
toggle and key whereby movement of the key causes the cam mechanism to bring
the toggle substantially on its pivots; and a type-carrier guide which compels the
type-carrier to move straight against the platen immediately preceding impression
and which holds the type positively at the impression point during impression, the
pivots of the toggle being substantially in one and the same line with each other
at the instant of impression to print by pressure without concussion, all substantially
as and for the purpose set forth.
Third. In a type-writing machine, the combination of a platen; a type-carrier;
a toggle for pushing the type-carrier at the impression point; and a key for
straightening the toggle, with a cam operating mechanism controlled by movement
of the key, the cam mechanism being operative to straighten the toggle, the pivots
of the toggle being substantially in one and same line with each other at the instant of
impression, to print by pressure without concussion, substantially as and for the
purpose set forth.
Fourth. In a type-writing machine, the combination of a type-carrier; a platen;
a key; a toggle and cam mechanism, the toggle straightening on its pivots by
movement of the key, through the instrumentality of the cam mechanism when
impression is given, the pivots of the toggle being substantially in one and the same
line with each other at the instant of impression to print by pressure without
concussion, substantially as set forth.
Fifth. In a type-writing machine, the combination of a platen; a type-bar; and
a key lever, with an intermediate toggle, one member of which pushes the type-
bar, the cam operating directly on the toggle to straighten it, and being connected
with the type-lever, the pivots of the toggle being substantially in one and the
same line with each other; at the instant of impression, to print by pressure
without concussion, substantially as and for the purpose set forth.
Sixth. In a type-writing machine, the combination of a platen; a type-bar guide
a type-bar; a toggle, one member of which is pivoted to the type-bar, and a second
member of which is pivoted in the machine, and provided with a cam-path; a cam-
roll working in the cam path; a swinging carrier for the cam-roll, a link connecting
the cam-roll-carrier with a key-lever; and a key lever, substantially as and for the
purpose set forth.
Seventh. In a type-writing machine, the combination of a platen; a type-bar
guide; a type-bar, and a key-lever with an intermediate toggle mechanism for
pushing the type-carrier at impression, the toggle being provided with a cam-path;
a swinging-cam-roll-carrier having a cam-roll working in said path, the swinging
cam-roll carrier actuated by the movement of the key to straighten the toggle;
the cam-path being so formed that, when the pivots of the toggle are brought into
substantially the same line with each other, the velocity of the type-bar is
gradually diminished until the type-bar reaches the impression point so that the

page_text: type are brought to the paper without concussion, substantially as and for the
purpose set forth.
Eighth. In a type-writing machine, the combination of a platen; a type-bar guide;
and end-wise moving type-bar; a toggle, one member of which is pivoted to the
end-wise moving type-bar, and the second member of which is provided with a cam-
path and pivoted in the machine; a swinging cam-roll carrier provided with a
cam-roll; a link connecting the swinging cam-roll carrier with a key; and a key;
the cam-path having a part struck on the radius of a circle from the pivotal point of
the swinging cam-roll carrier, all so arranged that, when the pivots of the toggle are
brought into substantially the same line with each other, by movement of a key, the
cam-roll is on that part of the cam-path which is struck from the pivotal point of the
cam-roll carrier as a centre, substantially as and for the purpose set forth.
Dated this 8th day of September 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.