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Патент USA US2118846

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2,118,846 -
Patented May 31, 1938
UNITED STATES PATENT oFFrcE
mawm'rmc MAQBINE '
_ > William F. Helmond, West Hartford, Conn.; as:
signor to Underwood Elliott Fisher Company,
_ New York, N. Y., a corporationlot Delaware
Application December 14, 1933, Serial No. 702,301‘
14 Claims. . (01. 191-102)
the key by the ?anged annular cap, and the area
This invention relates to the keys of typewrit
ing machines, and, for illustration, the invention
is shown embodied in a well-known type of key,
provided with a socket which ?ts upon the stem
of a type-operating lever.
In a typewriter key, the character-bearing disk
is usually capped by a glass disk. The hardness
of the glass prevents it from being scratched or
marred, and hence glass keys are esteemed for
10 use on trial machines, as they do not become in
of the character-bearing surface is much extend
ed as compared with glass keys now in connnon
use; while the width of the inturned ?ange of
the cap may be reduced from common practice, - 5 '
and the same rendered inconspicuous.
dip his ?nger; and the ?nger is therefore not 10
liable to catch upon any adjoining key, at either
jured. The character-disk and the glass disk
front, back or one side or the other; which is a
have ,usually been placed in a metal cup, and
held in place by an annular key-cap, the latter
having an inturned ?ange to hold down the glass
15 disk. .These- ?anges have been punishing the
?ngers of the operators for over ?fty years.
substantial advantage, especially where it is de
sired to operate the keyboard without sight of
the keys.
.
15
-The bed for the glass top is a gasket that) is
Flangeless keys have beenintroduced, which
are molded all in one piece, and fastened directly‘
upon the key-stem, but they have not tended to
2 supplant the glass-disk keys. The molded key,
being made of celluloid or other in?ammable
material, is apt to become ignited. Moreover, it
-
'
In some keyboards, the entire diameter of every
key may be somewhat reduced, thus enlarging the
space or well down into which the operator must
_ is easily scratched or defaced, and is also liable
jto soften from heat and become misshapen.
'
inexpensively cut out from a sheet of pressed
cork or cork-compound, havinguniform thickmess. The bottom of the metal key-cup is dished
or concaved, to correspond with the convex bot
tom of the glass top, which isof uniform thick
ness. Thus the dished glass is solidly supported,
and danger of breakage is avoided. The cork
gasket is preferably pressed into concaved form
The glass key tops or disks are usually cut ' beforebeing placed in the cup. The cork is some 25
2.? roughly from sheet-glass, and subjected to ?nish
ingvoperations, and, besides the raised ?anges,
have the further objection'oi‘ being ?at, and
therefore not ?tted to the ‘?nger of the operator.
so
It is one of the objects of the present inven—
tion‘ to produce a typewriter key which over
comes these common objections.
\
7
One of the features of the invention is a key
top in the form of a concaved glass disk which is
35 adapted to the ?nger and is not objectionably
?anged and is cheaply produced and readily se
cured in place.
a »
In the upper face of the glass, the comer is
ground away to form an annular depression, in
40 which fits an inturned fastening ?ange of the
annular metal key—cap; said ?ange being prefer
, ably ?at and ?ush’with the glass disk at its
border. ' No raised portion is encountered by the
operator's ?nger; there is a broad concaved
45 bearing surface of glass, having a ?at metal
border of moderate width, thereby avoiding undue
reduction in the diameter of the key-top exposed
between the inner edges of the ?ange.
' To secure this width of the glass top, it is made
50 of the same diameter as the key-cup, and. sur
mounts the same, the glass being bedded upon a
what yielding, thus ‘tending to cushion the
key-touch and minimize the fatigue of operating
the typewriter. The cork recovers its normal
height when the pressure is released;
.
»
In one form of the invention, the character may 30
be printed upon the bottom of the glass ‘lens.
Said bottom may be frosted or otherwise prepared
to take the ink with which the character is print
ed‘. When the character is printed upon the bot
tom .of the glass, the light pressure between the 35
frosted bottom of the glass andthe ‘top of the
cork gasket will prevent the glass from becoming
_ accidentally rotated.
key-paper is used.
The same is true when a
-
e
The key-paper may consist ‘of a thin card, 40
which, after printing the character thereon, may
be pressed into concave form, to form the bed or
the upper layer of the bed which supports the
concaved clear key-glass.
,
The character may be printed directly upon the 45
cork disk, and the latter may be stained or colored
to harmonize with the color of the casing in
which the typewriting-machine keys are used.
If a printed key-glass is'employed, the pressed
cork gasket may be stained or colored. This 50
coloring of the cork will give a beautiful e?ect
concaved pressed cork bed, the latter having the ‘ through either clear or frosted glass.
From a large clear-glass dish, of uniform thick
form of a disk which ?ts within the key-cup.
ness,
and of the same concavity that is desired in
The border of the glass top overlies the brim of
a the key-cup. The glass top is held ?rmly upon the finished key, many key-glasses may be cut 55
2
2,118,846
or formed. The glass-key top can be produced
from any portion of the dish, and will be found
to have the desired concaved form. The key
glass is ?nished to proper size and given the
5 border-groove in its top for receiving the fasten
ing ?ange.
.
Said ?ange 22 may be ?at and flush with the
top of the key-glass at its border, so that a prac
tically unbroken mainly concave surface extends
the full width of the key.
At Figure 5, there is employed a disk 26 beneath
-
the glass, having thereon a character as seen at
Figure 4. This character-disk is made of card
and printed, and then pressed into concave con
Other features and advantages will herein
after appear.
’
.
.
.
In the accompanying drawing,
a
dition before being
Figure 1 is a sectional front elevation of a
typewriter key embodying the present improve
ments in one form.
'
Figure 2 is a perspective of a key-glass having
a frosted bottom upon which the character is
15
printed.
-
due to the friction of the cork bed upon the bot
tom of the cup. When the character-disk is em
.
20
_‘
a
_ be omitted. /
Figure 5 is a sectional elevation showing the
invention in a different form from Figure 1. ~
The described glass-key‘tops may be made by
-
blowing a glass globe or bubble 28 of the desired
wall-thickness, and having a concavity of they
Figure 6 is a plan of the key seen at Figure 1 or
_ Figure 5.
'
Figure 7 is a sectional view illustrating a step ~ dimension desired for the key-top. The diameter
of the blown-glass globe may be say three inches
25 in the dividing out of ‘a key-glass from a com
or a little less.
‘
plete blown-glass globe or bulb, the diamond
being indicated as cutting the key-circle in the
‘blown globes
‘
key-top-outlining segments to, form many un
?nished key-tops or glasses, as seen at Figure 10.
.If desired, the ke -glasses may be out directly
globe into segments, preparatory to dividing them
up into key-glasses.
35
Figure 10 illustrates the dividing of a segment
up into many‘ key-glasses.
from the-globe 28, without ?rst dividing the latter
into major segments, 28*. This is illustrated at 35
Figure 7; the cutting being done byla rotary tool
Figure 11 shows a cork gasket stained with the
29 having a diamond marker or cutter 30 herein.
The glasses may be derived or separated from the
bulb (or from a segment) by means similar to
desired color, and having the key-character
40
‘
Figure 12 represents the assembled key as being
provided with the stained or imprinted cork
gasket of Figure 11.
Upon a key-lever stem I0 is forced down a
socket-portion l2, formed in the bottom of a key—
cup l3. 'The latter has circular rim or sides I4,
and its bottom is concaved, as in Figures 1, 5,
those employed in‘ separating ?at key-glasses 40
from sheet-glass. Then the recess or niche may
be cut in the edge by the use of a hollow grinder
3121 as seen at Figure 8, using an abrasive mate
r
-
Within the cup is placed a bed l5 of pressed
50 cork-compound, whose bottom is of spherical cur
vature, ?tting the bottom of the key-cup l3. ,
Upon the bed I5 is placed a transparent glass
, with concave top as at I1, and with convex‘
bottom as at l8, the glass being inexpensively
55 made of uniform thickness in the manner de
scribed herein.
7
,
_
I
Upon the bottom of the glass may be printed a
character IS. The bottom may be frosted as in
60
dicated at 20, prior to printing the character.
In the top of the glass is ground an annular
recess 2|, to receive a fastening ?ange 22, formed
.
'
. There is thus
and 12 to correspond with the curvature of the '
key-glass.
produced an efficient, durable 45
key at low cost.
Variations may be resorted to within the scope
of the invention and portions of the improve
ments may be used without others.
Having thus described my invention, I claim: 50
1. A typewriter-key having a glass top shap' 'i
with a brim and a crown which over tops said
brim, said glass being curved bodily to make the
crown concave and to make the glass of uniform
thickness through the crown, a bed which is 55
curved bodily to conformto said glass, said glass
resting upon said bed, a cup having’ a concave
bottom upon which said bodily curved bed rests,
and an annular cap with an inturned ?ange
bearingupon said brim of the glass top and being 60
upon a metal annular cap 23, which is fastened I ?ush with the crown thereof, said annular cap
down by inturned ears or clasps 24, that hold the
'glass and bed i5 down upon the concaved bottom
65 i3 of the cup, and also preferably in contact with
the top of the key-lever stem ID at 25. ~
The glass i6 may be the same diameter as the
cup i3, and overlie the brim of the cup as seen
,- at Figures 1 and 5; thereby a?ording a maximum
70 diameter to the key-glass for visibility, and also
favoring the use of a key of. somewhat less di
ameter than the common key.‘ The width of the
?ange 22 is very slight, affording a relief to the
eye, and the character-surface of the key may
be very broad.
25'
The cooled globe may be divided into major seg
ments if desired.» The major segments may have
any desired contour.‘ They may be dished or of
circular form as seen at Figure 9.
Then each segment may be cut up into smaller 30
K“ Figure 8 illustrates the manner of grinding the
30 border-recess or groove in the top of the key
glass by means of an abrasive.
Figure 9 shows the division of a blown-glass
printed directly thereon.
15
ployed, the character is not printed upon the bot—
tom of the key-glass, and the frosting may also
Figure 4 is a perspective view of a concaved
key-paper.
l0
being accidentally rotated, this steadiness being
.
Figure 3 is a perspective of a compressed cork
bed for the glass.
placed upon the cork bed I 5. ' '
If desired, an adhesive may be employed as seen
at 27, to hold the character-disk and cork bed to
gether; and the glass is held down with such
pressure as to prevent the character-disk from
being removabiy attached to said cup ‘to hold the
I parts together.
2. A typewriter-key having an extemally-con
cave glass top of practically uniform thickness, 65
a bed which is curved bodily to conform to said
glass top, said glass top resting upon said bed, a
cup having a concave bottom upon which said
bodily-curved bed rests, and an annular'cap with
an inturned ?ange, the glass top being provided 70
with a brim and a crown which overtops said
brim, said annular cap-?ange bearing upon said
brim and being ?ush with the crown thereof, said -
bed having a character inscribed thereon, the
friction of the glass upon the character-bearing 75
*
2,118,846
. bed, e?ected by means of said annular cap, hold
glass top, and an annular cap having an inturned
ing the character-bearing bed against the bottom
of the key-cup, to locate the character-bearing
bed rotatively.
,
‘3. A typewriter-key having a cup, a yielding
bed therein, a glass key-top of equal breadth with
said cup and resting upon said bed, the bed be
ing proportioned to space the glass key-top from
the underlying rim of the cup, and an annular
10 key-cap holding said glass key-top down upon said
bed, the key-cap having an inturned glass-hold
glass-holding lip, said glass top being provided
with a border-recess for said lip, said lip being
thereby rendered ?ush with- the glass top, said
annular cap being removably attached to said cup
for holding the parts together.
'
8. A typewriter-key having an externally-con
cave glass top of practically uniform thickness,
a base by means of which the top is supported,
and an annular‘ cap attached to said base and 10
having an inturned glass-holding ?ange, said
glass top being provided with a border-recess
of the wall of the cup, affording a broadened ' forming a brim upon which said key-cap ?ange
ing ?ange of a width about equal to the thickness
exposure of the surface of- the key a?orded by
15 said glass key-top, said glass key-top having an
. annular border-recess into which said ?ange is
sunken to be ?ush with the key-surface, said re
cess forming said glass with a brim upon which
said ?ange bears and a crown which overtops said
'20 brim to ‘be ?ush with said ?ange, a key-character
bears, and also forming the concave top into a
crown substantially ?ush with said ?ange.
9. A typewriter-key having an externally-con
cave glass top of practical-1y uniform thickness, a
15 ..
cup and a bed therein by means of which said
marking being provided between said glass key
glass top is supported, and an annular key-cap
having an inturned ?ange which is sunken ?ush 20
with said glass top, and is removably attached to
top and bed.
said cup to keep the parts together, said glass
.
‘
4. A typewriter-key having a cup, a glass key
top 01’ equal breadth with said cup, said glass
key-top being curved bodily to a?ord a concave
top, a yielding ‘bed in said cup upon which said
top being furthermore provided witha border
which shapes the glass with a brim upon which
the key-cap ?ange bears, and which also shapes 25
the concave top into a crown which is ?ush with
glass key-top rests, said bed being proportioned
to space the glass key-top fromwthe underlying
said ?ange.
brim of the cup, and an annular key-cap holding
cally uniform thickness for a typewriter-key or
30 said glass key-top down upon said bed, the key
"
10. A curved-surface glass key-top of practi
the like, one side of said key-top being provided 30
cap having an inturned glass-holding ?ange of a
width about equal to the thickness of the wall of
with a border-recess to form a brim, and a crown
which overtops said brim, whereby said crown
the cup, a?ording a broadened exposure of the and a key-top-holding ?ange bearing on said
concave surface of the key a?orded by, said glass ' brim may be'?ush at the periphery of the‘ crown.
11. A typewriter key having a cup, a bed in the 35
35 key-top, said glass key-top having an annular
border-recess in which said ?ange is sunken to cup, a glass top resting on said bed,v said glass
be ?ush with the key-surface, said recess forming top being formed with a brim and a crown that
said glass key-top with a brim upon which said overtops said brim, and an annular cap with an
?ange bears and a crown which overtops said inturned ?ange which bears upon said glass brim
40 brim to be ?ush with said ?ange, a key-character and is substantially ?ush with said crown, said
marking being provided between said glass key‘ annular cap being attached to said cup to hold the
top and bed.
"
' 5. A typewriter-key having, in combination, an
externally-concave glass top of practically uni
45 form thickness, a gasket upon which said glass
top rests, a cup in which said gasket is retained,
said gasket being curved bodily and the bottom
of the cup being concave to correspond with the
curvature of said glass top, and an annular cap
50 having an inturned v?ange tor engaging over the
border of said glass top, said annular cap being‘
removably attached to said cup, to keep the parts
together, the glass top being supported upon the
gasket to overlie the rim of he cup ‘and said
parts together.
,
12. A typewriter key having a cup, a yieldable
bed in the cup, a glass top. resting on said bed
but overlying and spaced above the rim of the 45
cup, said glass top being formed with a brim and
a crown that overtops said brim, and an annular
cap with an inturned ?ange which bears upon
said glass brim and is substantially ?ush with
said glass crown, said annular cap being attached
to said cup to hold the parts together.
13. A typewriter key having a cup, a yieldable
bed in the cup, a glass top resting on said bed,
said glass top being formed with a brim and a
55 ?ange being about equal in breadth to the wall ' crown that overtops said brim, means for pre
of the cup, a?ording a broadened exposure of the
surface of the key, said glass top being provided
with a border-recess which shapes the glass top
with a rim, upon which said cap-?ange bears,
and with a crown which is ?ush with said cap
?ange.
-
6. A typewriter-key having an externally-con
venting relative. rotation between the glass top 55
and the yieldable bed, and an annular cap with
an inturned ?ange which bears upon said glass
brim and is substantially ?ush with said glass
crown, said annular cap being attached to said
‘cup to hold the parts together.
14. A typewriter key having a cup, 2. yieldable
cave glass top of practically uniform thickness,
bed in the cup comprising a cork disk, a glass top
and an annular metal cap provided with an in
resting on said bed, ‘said glass top being formed
turned ?ange, said glass top being provided with
65
a border-recess which shapes said glass, top with
with a brim and a central crown which overtops
said brim, the bottom of the glass top being
a brim, upon which said key-cap ?ange bears, and
frosted whereby relative rotation ‘between the
also shapes the glass top into a crown which is
glass top and the cork bed is prevented, and an
annular cap with an inturned ?ange which bears
upon said glass brim and is substantially ?ush
?ush with said ?ange, said key-cap having means
for interlocking with a support for the glass top to
hold the parts together.
'
.7. A typewriter-key having an extemally-con
cave glass top of practically uniform thickness,
a key-cup and a bed therein for supporting said
with said glass crown, said annular'cap being
attached to said cup to hold the partstogether.
i
WILLIAM F. HELMOND.
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