Improvements in or relating to Typewriters.
Year: 1892

page_text: Date of Application, 24th Oct., 1892
Complete Specification Left, 22nd July, 1893-Accepted, 9th Sept., 1893
Improvements in or relating to Typewriters.
A communication from CHARLES SPIRO, of 146, Centre Street, in the City,
County, and State of New York, United States of America, Gentleman.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Member of the Institution of Mechanical Engineers, do hereby declare the nature
of this invention to be as follows:-
This invention has for its object improvements in the construction of typewriters
in the following particulars.
First, the method of supporting the paper table in its raised position to allow
of the removal of the platen. This is effected by pivotting the paper table in
arms or brackets projecting from the paper carriage cach pivot pin carrying a
coiled spring adapted to press the paper carriage into its lower position and one
of the pins being provided with a collar having a notch into which takes a latch
or detent pivotted upon the arm which carries the paper table pivot, the weight
of the detent causing it to enter the notch in the pivot pin when the table is
raised.
Permitting the free rotation of the paper platen in either direction. This may
be accomplished by providing a spring-controlled headed pin say upon one of the
line feed levers or ratchet detent in such a manner that when out of use the
pawl which turns the platen at the end of every line engages with the star wheel
for that purpose, but when the pin is brought into operation and placed in its
operative position the pawl is placed out of engagement with the star wheel which
can then be turned in either direction.
The provision of two alarms upon the bell where double columns are required.
This is effected by the provision of a screw for fixing the locking stud for locking
the key board, the locking stud then acting as a second bell ringer so that two
alarms can be given.
In an improved margin block. This consists of a block or plate doubled round
the margin rack and provided with a knob and a spring pawl and arm to move
it, the arm being preferably curved for convenience so that by gripping the
fixed knob and the arm between the thumb and finger and pressing them
together the spring pawl is removed from engagement with the rack and the
block can be moved along the rack in either direction as required. The rack
also preferably lies in a horizontal plane except when operated by the margin
release when it is turned over into a more or less vertical plane thus taking it
out of the way of the paper carriage. In one direction the block can be freely
moved without moving the arm as the pawl slides over the ratchet teeth; to move
it in the other the arm must be operated to disengage the pawl..
Dated this 24th day of October 1892.
ALFRED J. BOULT,
Chartered Patent Agent.

page_text: COMPLETE SPECIFICATION.
Improvements in or relating to Typewriters.
A communication from CHARLES SPIRO, of 146, Centre Street, in the City,
County, and State of New York, United States of America, Gentleman.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Chartered Patent Agent, 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 the construction of typewriters
in the following particulars which will be best understood by reference to the
accompanying drawings, which are details of various parts of the mechanism, and
will be referred to in their proper places.
First. The method of supporting the table in its raised position to allow of the
removal of the platen.
This is effected by pivoting the paper table A, Figure 1, in arms or brackets B¹
projecting from the paper carriage B each pivot pin A' carrying a coiled spring A²
adapted to turn the paper table A into its lower position. One of these pins A' is
provided with a collar A³ having a notch A4 into which takes a latch or detent C
pivotted at C upon the arm B¹ which carries the paper table pivot, the weight
of the detent causing its end C2 (which may be curved to the curve of the pivot)
to enter the notch A in the collar A³ when the table is raised. As shown in
Figure 1 the detent C is out of engagement with the collar A³ and the springs A²,
of which there will be one at each end and one pivot pin at each end of the table A,
have turned the table into its lowest position. To turn the table its edge A³ may
be raised by the hand of the operator when the collar A³ will be turned with the
table and the end C2 of the detent C will in due course enter the notch A and thus
hold the table in its raised position all as shown in Figure 5.
.
Secondly. Permitting the free rotation of the paper platen in either direction.
This may be accomplished by providing a spring controlled headed pin D
Figures 2 and 3, say upon one of the line-feed levers or ratchet detent D in such a
manner that when the pin Dis out of use the pawl E, Figure 3, which turns the
platen at the end of every line engages with the star or toothed wheel F for that
purpose, but when the pin D' is brought into operation and placed in its operative
position, that is pressed inwards as in Figure 2, it engages with a portion of the
paper carriage B, or as shown in Figure 2 with the pivotted catch G which secures
the platen in position, so that neither the detent D nor the pawl E is then able to
engage with the wheel F and consequently tlie platen can be turned in either
direction quite freely. To release the detent and pawl the pin D' is pulled back or
allowed to return under the influence of a spring D coiled round it so that its
end D' no longer engages with G and the parts operate in the usual manner.
Figure 2 the pawl E has been omitted for the sake of clearness.
In
Thirdly. The provision of two strokes upon the bell thus giving two alarmıs
where double columns are required.
This is effected by the provision of a screw H, Figure 4, which when screwed
down engages with the end or head of the locking bolt I preventing it from moving
and thus holding the stop K and cansing it to engage with the hell trip L., In the
ordinary way when the bell trip L engages with the point K¹ of the stop K. which
fits sufficiently firmly upon the locking bolt I to resist its movement the spring I'
of the locking bolt gives way and the point K' moves with the bell trip carrying
forward the locking bolt 1 which then engages with the arm.) of the bail upon which
all the keys act and thus locks the keys and stops the further operation of the
machine; when however the rod I is fixed by the screw H the point K is also
fixed and the bell is rung but the operation of the machine is not stopped. The
screw H is also so arranged that when the locking bolt I, Figures 4 and 6, is

page_text: pushed forward so as to engage the arm J of the bail and thus lock the key board,
the screw H may be screwed down behind it and by preventing it from returning
fix it in its locked position. N is the usual' adjustable stop for ringing the bell.
Fourth. An improved margin block.
This consists of a block or plate M¹ Figure 1 double round the margin rack M
and provided with a knob. M² and a spring pawl and arm M³ to move it; the arm
is preferably curved as shown for convenience so that by gripping the fixed
knob M² and the arm M³ between the thumb and finger and pressing them together
the spring pawl M' is removed from engagement with the rack and the block M'
can be moved along the rack in either direction as required. The pawl M is more
clearly shown in Figure 1 which is an inverted plan of the rack, margin block and
pawl. In one direction the block can be freely moved, without moving the arm M³
as the pawl M' slides over tho ratchet teeth; to move it in the other direction the
arm M³ must be operated to disengage the pawl. The rack preferably lies in a
horizontal plane except when operated by the margin release when it is turned over
into a more or less vertical plane thus taking it out of the way of the paper
carriage.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondent and in what manner the
same is to be performed, I declare that what I claim is
..
1. In a typewriter the combination with the paper table A of a fixing device for
holding it in its raised position, Figure 5.
2. In a typewriter the combination with the table A of pivot pins A¹ springs A'
notched collar A³ A' and pivoted detent C C2 substantially as and for the purpose
described and illustrated in Figures 1 and 5 of the accompanying drawings.
3. In a typewriter the combination and arrangement of mechanism for engaging
and releasing the platen substantially as described and illustrated in Figures 2
and 3 of the accompanying drawings.
4. In a typewriter the combination with the line-feed levers or ratchet detent, of
a spring controlled pin such as D' substantially as and for the purpose described
and illustrated in Figures 2 and 3 of the accompanying drawings.
5. In a typewriter the combination with a rotatable platen of a spring controlled
pin such as D for the purpose of releasing the said platen substantially as described
and illustrated in the accompanying drawings.
6. In a typewriter the combination with the locking bar and stop K K¹ of a
screw such as H whereby an extra signal may be given substantially as described
and illustrated in the accompanying drawings.
7. In a typewriter the employment of a screw such as H which serves the double
purpose of fixing the locking bar I out of engagement with the bail arm J and
securing the bell stop K K and also of fixing the locking bar I in the path of the
bail arm J so as to prevent the operation of the typewriter substantially as
described and illustrated in the accompanying drawings.
8. In a typewriter the improved margin block substantially as described and
illustrated in Figures 1 and 14 of the accompanying drawings.
9. In a typewriter the combination with the margin rack M of au adjustable
margin block such as M' M2 spring controlled pawl and arm such as M* M³
substantially as described and illustrated in the accompanying drawings.
Dated this 20th day of Jule 1893
W. P. THOMPSON & BOULT,
London, Manchester, Liverpool, Nottingham, Agents for the Applicant.