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Патент USA US2134845

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Now. ‘i, 1938.
J. A. B. SMITH
‘
2,134,845
TYPEWRITING MACHINE
Filed Dec. 21, 1955
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BY
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INVENTOE:
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Patented Nov. 1, 1938
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Q
UNITED STATES PATENT‘ OFFICE
2,134,845
TYP‘EWRITENG MACHINE
Jesse A. B. Smith, Stamford, Conn, assignor to
Underwood Elliott Fisher Company, New York,
N. Y., a corporation of Delaware
Application December 21, 1935, Serial No. 55,503
4 Claims.
This invention relates to the keys of typewriting machines.
This invention discloses a very light, compact,
fabricated key having a metal key-cup, secured
to the key-lever, and an annular metal cap,
struck up of thin metal, removably secured to
the key~cup; said cap having a comparatively
narrow, inwardly turned brim by means of which
a preferably multi-ply character-disk is secured
it in position in such manner as to have an unsup-
(Cl. l97—103)
No. 2,059,615) there was a requirement for divi
sion of certain of the subject matter contained in
the present application as ?led. Further .division
having been required, said subject matter is now
contained in my co-pending application Serial 5
No. 195,717, ?led March 14, 1938.
Other features and advantages will hereinafter
appear.
in the accompanying drawing—
Figure 1 is a perspective of a portion of a type- 10
ported central portion.
In one embodiment of the invention, a character-bearing disk rests, entirely within the key~
writer-key-bar with a key mounted thereon.
Figure 2 is a sectional view of the key construc
tion, illustrating the concavity of the central
cup, on a ?at-topped annular ring struck out of
area due to ?nger pressure.
i5 ?bre or similar material.
overlying the char-
acter--bearing disk, a protective contact disk of
hard, transparent Celluloid is placed, having a
diameter equal to the outside diameter of the
key~cup. The disk rests on the edge of the key:70 cup,
The metal cap is formed with a narrow, in-
turned brim, which pinches‘ the Celluloid disk
tightly against the edge of the key-cup, and
serves frictionally to hold the character-bearing
}; disk in position, preventing its accidental rotation in use.
The character-disk is housed completely within the key-cup, and is not subjected to sharp
bending.
It can therefore be made of very in~
31.) expensive materials, such as stiff, heavy paper,
etc.
The contact surface of the key is normally ?at,
but there is an unsupported or partially supported central area and the ,yieldable contact»
“:3 disk and character-disk form a cushion-like construction, which may yield slightly into the open-
ing of the annular support, on being struck.
The annular flange or brim of the key-cap is
Figure 3 is a sectional view of a slightly modi- 15
?ed form of Figure 2.
Figure 4 is a detailed perspective of the disas
sembled key of Figures 1, 2 and 3.
Figure 5 is a representation of the key of Fig
ure 3, showing the central area ?exing under 20
?nger pressure.
Referring to Figures 1 and 4, 20 represents a
typewriter~key~bar having an upwardly extend
ing stem 21'. A key-cup 22 is formed with a rec
tangular socket 23 to engage the stem tightly and 25
has a circular base 24 and an upwardly extend
ing rim 25, forming the cup.
An annular ring 26, Figure 4, which may be
punched out of vulcanized ?bre or other suitable
material is formed to ?t snugly within the key- 30
cup on the bottom thereof, and forms a base for
a character-bearing disk 21 on which is printed
a character 28. The width of the ring 26 is sui?
cient to provide a substantial supporting surface
for the disk 21, as illustrated in Figure 2, and its 35
height, plus the thickness of the disk, is prefer
ably equal to, or slightly greater than, the depth
of the key-cup.
very narrow, it being necessary only to extend
in) over the edge of the key-cup. A large effective
contact area is thus provided, making it possible,
A protective disk 29 of thin, hard, transparent
material, such as Celluloid, having a diameter 40
equal to the outside diameter of the key-cup 22,
if desired, to reduce the overall diameter of each
key without reducing the size of the character, or
obscuring the operator’s View of it. Such a re45 duction in key-diameter has the very desirable
is formed to overlie the character-disk 21 and
serve as a protective element therefor.
A cap 30, which is formed to slidably engage the
sides of the key-cup 22 with a tight ?t, is a thin, 45
effect of increasing the ?nger-space or “well”
between keys.
The key-caps have suitable ears or lugs ar-
ranged to be clasped beneath the key-cup when
annular metal band withanarrowinturned brim
or ?ange 3| and a plurality of downwardly ex
tending ears or lugs 32.
After the annular ring 26, the character-disk
ED. the key is assemble-d.
Such assembly may be
formed in a suitable press and sufficient pressure
used to integrate the component parts into a
tightly assembled unit.
21 and the transparent disk 29 are assembled as 50
shown in Figure 3, the assembly is integrated by
slipping the cap 30 over the key-cup, pressing the
brim 3| downward to pinch the disk 29 tightly
During the pendency of my application Serial
55 No, 698,063, ?led November 15, 1933, (now Patent
against the edge of the cup, and bending the
cars 32 inwardly beneath the key-cup. Rotation 55
‘
2
2,134,845
of the protective disk 29 is prevented by the fric
tional engagement with the edge of the cup; the
rotation of the character-disk 21 is likewise pre
vented by the frictional contact with the disk 29,
the inner wall of the key-cup, and the surface of
the annular ring 26,
the combination of a cup having provision for
mounting on a key-lever, a flat-topped annular
support within said cup and resting on the base
thereof, a resilient character-bearing disk sup
ported on said annular support within said cup,
a resilient transparent protective element of di
The assembled key has a normally planar con
tact surface, as indicated in Figure 3. The brim
ameter equal to the breadth of said cup resting on
said character-disk and on the edge of said cup,
and a metal band having an inturned brim ar
3| is not ?ush with the surface, but as it projects
10 above it only slightly more than the thickness of
the metal forming the brim, the key is much less
punishing to the ?ngers of the operator than
the usual high rim, glass topped, keys.
The contact surface of the key, being two-ply,
15 ?exible, and with an unsupported central area,
yields slightly under the pressure of the operator’s
?nger as shown in Figure 5, cushioning the im
pact. In Figures 3 and 5, the character-disk 21
is shown of comparatively heavy stock, and the
20 annular ring 26 is narrower, giving less direct
support to said disk. With this type of annular
ring, the disk 21 may preferably be made of Cellu
loid, treated fabric, or similar material.
In the form shown in Figure 2, the disk 21 may
be of stiff paper, or similar material, as the annu
lar ring 26 receives the greater force of the blow,
and the central portion therefore concaves less
than in the form shown in Figure 5.
Variations may be resorted to within the
30 scope of the invention, and portions of the im
provements may be used without others.
Having thus described my invention, I claim:
1. A key for use with a typewriter, comprising
in combination, a circular-edge cup, said cup
having provision for mounting on a key-lever, a
circular composite key-disk including a character
bearing disk united to a circular transparent
disk, said transparent disk projecting beyond the
border of the character-bearing disk, to form an
40 annular brim portion of the composite disk, annu
lar means within said cup underlying said char
acter disk for supporting the same at its border
only, said brim resting upon the circular edge of
ranged for clamping said protective element 10
against the edge of said cup.
3. A key for use with a typewriter, comprising
the combination of a cup having provision for
mounting on a key-lever, a ?at-topped annu
lar support within said cup and resting on the
base thereof, a resilient character-bearing disk
supported on said annular support within said
cup, a resilient transparent protective element of
diameter equal to the breadth of said cup resting
on said character-disk and on the edge of said
cup, and a metal band having an inturned brim
arranged for clamping said protective element
against the edge of said cup, the surface of said
protective element remaining substantially
planar.
4. A key for use with a typewriter, comprising
in combination, a circular-edge cup, said cup hav
ing provision for mounting on a key-lever, a cir
cular composite key-disk including a character
bearing disk united to a circular transparent disk, '
said transparent disk projecting beyond the bor
der of the character-bearing disk to form an an
nular brim portion of the composite disk, annu
lar means within said cup underlying said char
acter disk for supporting the same at its border 5
only, said brim resting upon the circular edge of
said cup, and a removable annular metal cap
?tting on, and pinching said brim down upon the
edge of, said cup, to clamp the same against acci
dental rotation with respect to said cup, said com
posite disk being sufficiently ?exible and su?i
ciently unsupported at its character-bearing area,
to ?ex when struck a staccato blow by the op
said cup, and a removable annular metal cap
erator’s ?nger, thereby cushioning the key stroke,
?tting on, and pinching said brim down upon the
edge of, said cup to clamp the same against acci
dental rotation with respect to said cup.
2. A key for use with a typewriter, comprising
said cap resisting the tendency of the disk, when
it is ?exing, to pull off from the cup edge.
JESSE A. B. SMITH.
~10
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