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Патент USA US2110668

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March 8, 1938.
’
H. JANSSEN
2,11%,668
CALENDAR AND THE LIKE
Filed Jan. 50. 1935
2 Sheets-$11661. l
Firs-“Ed
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51'
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1
M”
UR
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2
IN VEN TOR
Hem Jivmssan,
'
BY
(5*
A TTORNEY.
8, 1938.
|-|_ JANSSEN
CALENDAR AND THE LIKE
Filed Jan. 30, 1935
2 Sheets-Sheei 2
“F1 E ..E_
L
5
T 11
WWWW‘
I
INVENTOR.‘
J'Mzyhmsan;
1%7/63 "
‘
ATTORNE
.
Patented Mar. 8, 1938
2,116,6tt
UNITED STATES PATENT OFFHCE
2,110,668
CALENDAR AND THE LIKE
Henry Janssen, Wyomissing, Pa., assignor to Tex
tile Machine Works, Wyomissing, Pa., a corpo
- ration of Pennsylvania
Application January 30, 1935, Serial No. 4,005
18 Claims. (01. 40-111)
This invention relates generally to perpetual of the invention shown in the accompanying draw
desk calendars and similar devices.
ings, my invention resides in the novel elements,
Perpetual desk calendars have, heretofore, been features of construction and arrangement of
,
provided with more or less complex automatic
parts in cooperative relationship, as hereinafter
'5- movements in which a series of cooperating cal
more particularly pointed ‘out in the claims.
. endar indices and their associated drums progres
In the drawings:
sively function to indicate successive days upon
Figure 1 is a perspective view of the invention;
operation of a single control member. The com
Fig. 2 is a top plan View of the device shown in
plexity of such structures, along with an accom
Fig. 1;
10 panying inherent bulkiness, has apparently ef
Fig. 3 is a front elevation of the device of Fig. 1;
Fig. 4 is a vertical longitudinal section, looking
fected the result that devices of this type receive a
more or less indifferent reception from the trade
in general.
from the front, and taken on a line passing
through the axis of the device;
In the case of those perpetual calendars in -
which the various indicating units are independ
ently operable, the positioning or placing of the
index manipulating members has been so conspic
uous as well as so inept as to‘ destroy the sym
metrical appearance and consequently, the. aes
20 thetic appeal to the intended purchaser or user
of the device.
One object of my invention is to produce a
perpetual calendar of novel construction, and one
in which the above recited detrimental features
25 are obviated.
'
It is also an object of this invention to produce a
device of this type which is simple and durable
in construction, and which ‘can be cheaply manu
factured.
Another object is to provide a device of this
character‘ with a novel arrangement of control
members which can be quickly and easily oper
ated.
A further object is to provide, in such a device,
' means to simultaneously yieldingly position one
or more rotative calendar units and ?xedly de—
termine the axial positioning of said units.
Still another object of this invention is to pro-.
vide a novel perpetual ‘calendar, presenting a sym
metrical, carefully balanced appearance to the
eye, and one having a relatively smooth contour
with no exposed awkward moving parts, and a
certain part, or parts, of which may be either
stamped or cast in metal or even pressed or cast
from any one of a number of phenolic condensa
tion products, thereby further enhancing its ar
tistic as well as utilitarian advantages. With this
in mind, other and further attendant advantages
will be possible by providing for the accessory
utilitarian elements of pen or pencil holding
grooves, and the like, in ‘connection with addition
ally suggested uses.
With these and other objects in View which will
readily become apparent from the following de
tailed description of an illustrative embodiment
Fig. 5 is a vertical transverse sectional view
taken on the line 5-5, Fig. 4;
15
Fig. 6 is also a vertical transverse sectional view
similar to Fig. 5, taken, however, on the line 6-4,
Fig. 4.; and
Fig. 7 is an enlarged perspective view of one
of the date-indicating indices or drums removed 20
from the casing, with a portion broken away and
in section to more clearly disclose its construction.
For purposes of convenience and in order to
more clearly bring out some of the various advan
tages of this invention, it is hereinafter described 25
as substantially consisting of a cast plastic or phe
nolic vcondensation product, but it will be under
stood that the method of operation of the device
and the utility thereof is equally eiifective when
cast or pressed from other materials, such for
example, as metal.
In all of the drawings, corresponding parts have
been similarly numbered, the respective numbers
being duplicated in order to indicate similar ele
ments and in order that they may more clearly
indicate the relationships and facilitate the asso
ciation of those parts in the cli?‘erent drawings
wherein the embodiments herein are speci?cally
described.
'
The embodiment of the invention herein illus
trated comprises a unitary base structure con
taining a cylindrical housing for telescopically
and rotatably supporting a plurality of date-indi~
eating drums or character wheels juxtaposed in
end-to-end relationship.
The drums are manu
ally operable by means of respective knurled knob
members positioned at the extremities of the drum
housing. These drums or indices have a distinc
tive series of date-indicating characters either
formed on or aflixed to their respective periph
eries. The date-indicating characters of each
series are successively visible through suitable
window openings or sight apertures formed in the
cylindrical portion of the housing shell. These
characters are changed by manipulation of the 55
2
2,110,668
respective knob members. Individual knobs, or
the like, are associated with each of the date
indi'cating drums to permit independent manipu
lation thereof, while spring-actuated detents are
utilized for cooperation with notched indentations
and grooves of suitable annular con?guration
cut in the periphery of the drums‘ in order to more
accurately and ?xedly position the index cylinders
in their housing.
Referring now to the drawings, the invention
comprises a unitary base structure It! in which a
pen and/or pencil receiving groove I2 is formed,
cidental rotation of their immediately associated
calendar drums.
The windows or sight apertures 3| and 31,
formed in the base l0, Figs. 1, 2 and 3, are pro
vided for exposing successive printed characters,
in the series carried by the drums l6 and I1,
progressively into view, upon turning the respec
tive knob members l8 and 19. The window open
ings or sight apertures 3! and 31 are preferably
arranged in a position for the best possible 10
visibility, giving a convenient selective observa
and which likewise includes a hollow cylindrical
tion of the symbols on the rotating drums. The
number of spaced detent-receiving notches on
opening i3, Fig. 5, which provides a housing for
telescopically supporting the vrotary date-desig
nating cylindrical index units generally indicated
words or numeral characters on the drums; thus 15
the spacing of the notches on each drum is direct
at M and 15, Fig. 4.
The right calendar unit designated by numeral
l5 comprises a pair of drums l6 and I"! which are
?xedly connected to and each individually oper
ated by the knurled knobs l8 and i9, respec
tively. The knobs‘ may, most conveniently, be
positioned co-axially adjacent each other, as at
the right end of the cylindrical housing 13 of base
structure l8, Fig. ll. The knob i9 is rigidly se
cured either by frictional support or other en
gagement to the drum [1, whereas the knob i8
is connected to the drum It by means of an inter
mediate axial stud or driving shaft 22, one end of
30 which may be imbedded or threaded into the knob
i8, while its other end is secured to the drum it
by nut 23, washer 24 and a spacer sleeve 25. The
sleeve 25 loosely telescopes the stud 22 and is
provided for spacing the drum “5 sufficiently
as from the knob 48 to allow the drums l5 and IT
to rotate independently. Date-designating wrap
pers 26, are tautly drawn over the outside of
cylindrical drums 56, l? and are maintained in
annular recessed or grooved portions 2'! and 28
49
which are formed on the outer surfaces of the
drums it and Ill respectively, substantially as
illustrated in connection with the drum l6, Fig. '7.
The ends of the wrapper 26 are inserted into the
hollow interior of the drum it through an open
slot 29, and are securely clamped against the
inner surface of the drum 56 by an expander ring
or spring clip 30. A spring-pressed detent 32 car
ried by the base it, Figs. 4 and 6, cooperates with
an annular groove 33 in the drum ll to ?x the
axial position of the drum l‘! and indirectly of
unit l5 relative to the cylindrical housing l3 of
the base it, while still allowing the drums l6
and H to rotate freely about their common axis.
In addition, a series of detent-receiving openings
55 3% are formed in the base of the groove 33 and
equally spaced, in sequence, corresponding to the
spacing of the printed characters on the drum
wrapper 26, for successively seating the resilient
spring-pressed detent 32. This provides means
for accurately ?xing the rotational position of the
drum I‘! by equal operative movements of its as
sociated knob. A ball detent 35, Figs. 4 and 5,
somewhat similarly coacts with complementary
notches 36 in the drum it for accurately ?xing
the rotational positioning of this drum coincident
with the day-by-day movement of successive
date-designating characters into alignment with
the sight aperture or window 31. The detents
32 and 35 are resiliently biased into engagement
70 with their respective drums by individual springs
33. The amount of biasing action is controlled
75
by set screws 3% carried by the base H3, Figs. 4,
5 and 6. The detents 32 and 35, by suitable ad
justment, are particularly adapted to prevent ac
each drum corresponds to the number of printed
ly proportionate to the spacing of the words or
characters thereon. It is obvious that a de?nite
alignment of the respective spring-pressed de
tents with successive detent-receiving notches is 20
desirable coincident with the progressive posi
tioning of the date-designating characters into
alignment with their respective windows or aper
tures. The progressive seating of the detents by
the notches in the drum simultaneously aids in
the positioning of the drum and centralizes the
date-designating characters relative to the respec~
tive index or symbol exposed in the windows.
A plate lit, secured to the base ill by screw
members 52, has a series of openings 43 formed
therein which are respectively aligned with the
spring-pressed detents 32 and 35. The openings
43 permit the adjustment of the detent control
screws 39 without necessitating the removal of
plate 48. A felt pad 44 may, preferably, be se 35
cured to the plate llil, Figs. Ll, 5 and 6, to prevent
scratching of the desk or supporting element upon
which the calendar may rest.
Inasmuch as the left and right calendar units
l4 and I5 embody identical features of construc
tion and operate in a correspondingly similar
manner, it is believed that the above description
relating to the unit i5 will likewise suffice to en
able those versed in the related arts to thoroughly
understand the construction and operation of
unit I4; however, in order to further assist one
in understanding the entire invention, similar
reference numerals have been employed to desig
nate corresponding parts of each unit. Thus
40
there are two center drums which are designated
by the numeral l5, and two outer drums which
are designated by the numeral ll. It follows that
the left calendar unit Hi, see Fig. 4, includes the
left end drum l1 and the left center drum l6, 55
whereas the right calendar unit l5 comprises the
right center drum l6 and the right end drum IT.
The right center drum it of unit i5 is illustrated
in Fig. 7.
As previously stated an end of the pin detent
32 acts as a position determining device in coop
eration with the notches 34 of the drum 5'! for
de?nitely fixing the rotative positioning of the
drum l1 and preventing any accidental rotation
of the drum. At the same time, the body por 65
tion of the pin 32 cooperates with the sides of
the annular groove or guide track 33 of the drum
I‘! to ?x the axial position of the unit £5. The
ball detent 35 cooperates with complementary
notches 3% formed or cut in the drum IE to inde
pendently determine the position of the drum l6
and prevent its accidental rotation.
In the preferred embodiment of the invention,
as depicted in Figs. 1, 2 and 3, index characters
70
one to zero, inclusive, are printed on a Wrapper 75
2,110,668
or indicator sheet 26 secured to the drum l6 and
are successively visible through the window 31
upon turning of the knob Hi. The drum it of
unit M, Fig. 4, may have thereon the numbers
one to zero inclusive, also, although, it is prefer
able that numbers one to three, inclusive, be used
as these alone are necessary.
The numbers are
successively aligned with the window 3i, Fig. 3,
upon manipulating its corresponding knob H3.
10 The characters on the drum 16 of unit it are
changed every tenth day and are used for indi
cating the ?rst digit of compound numbered days,
a blank space being aligned with window 3'! dur
ing the ?rst nine days of each month. The char
15 acters on the drum it‘ of unit l 5 are progressively
employed to designate dates from the ?rst to the
ninth day of the month, following which they are
progressively employed to indicate. the second digit
of the compound numbers employed to indicate
20 the dates from the tenth to the last day of the
month. Thus one drum l6, e. g. that of unit it,
is used independently of the other drum e. g. that
of unit ill, to indicate the days of the month from
the ?rst to the ninth thereof, and both drums it
25 are used in combination to indicate the dates
from the tenth to the end of the month. The
months of the year, indicated on a wrapper se
cured to the drum ll of unit it, are successively
visible through the window 3! upon manipulation
of the corresponding knob i9. The days of the
week which are indicated on a wrapper carried by
the drum ll of unit l5 are successively brought
into alignment with the window 3i upon manipu
lation of the associated knob ill.
35
The invention has been described in speci?c
terms, but, the details of structure may be varied
Without departing from the spirit of the invention.
'Thus, this invention is not limited to any particu~
lar method of, or product for, forming the base,
40 and, as is obvious to those familiar with the re—
lated art, a number of striking and beautiful hues
and color combinations are possible and can be
produced consistently in the ?nished product by
casting the article with any one of a number of
phenolic or other condensation products.
The
result is an enhanced and very striking, as well
as a very different and more useful, product than
any heretofore possible.
I claim:
1. A desk calendar comprising a base structure,
a drum member rotatably mounted in said base
structure, an annular grooved structure in the
surface of said drum member, a series of detent
receiving openings formed coextensive with the
base of said grooved structure, and a double~act~
ing detent member associated with said base
structure and coacting with the detent-receiving
openings and with the annular grooved structure
for de?ning the rotative positioning of the drum
60 and securing it against axial movement.
2. A rotary calendar comprising a base, a cylin
drical housing in the base, a plurality of sight
openings in the housing, a drum rotatably posi
tioned under each opening, means for rotating
65 each drum, an annular groove in the surface of
certain of said drums, notches coextensive with
the bottom of each groove, and a resilient pawl
for each drum secured to the base for cooperation
with the notches and the groove of the associated
drum.
3. A rotary calendar comprising a base, a cylin
drical housing in the base, a plurality of sight
openings in the housing, a plurality of axially
aligned rotatable drums, each drum individual to
one opening for displaying a portion of the drum
3
surface, telescopically mounted driving members
co-axial with the drums and with each other,
each individual to one of the drums, for selec
tively rotating the same, annular notches in each
drum, and a resilient pawl for each drum secured 5
to the base for cooperation with the notches in its
associated drum, and an annular groove in each
of the end drums, coextensive with the notches
thereof and engaged by the associated pawl for
preventing axial movement or" the plurality of
drums.
4. A perpetual calendar comprising a unitary
base structure, an open-ended ‘cylindrical hous
ing in said base structure, a drum rotatably
mounted in the housing operative through means 15
secured thereto, an aperture in the base, a series
of openings in the surface of the drum successively
operative to seat a spring-pressed detent carried
by the base, a wrapper on the drum with a pro
gression of date-indicating characters formed 20
thereon successively visible through the aperture
upon rotation of the drum, and an opening in the
periphery of ‘the drum for introducing opposite
ends of the wrapper from the exterior to the in
terior of the drum.
25
5. In combination, a hollow base structure, a
drum member rotatably mounted in the base, an
aperture in said base, a date-designating wrapper
on said drum with a progression of date-designat~
ing characters formed thereon successively visible
through the aperture upon rotation of the drum,
an opening in the periphery of the drum for intro
ducing opposite ends of the wrapper from the ex
terior to the interior of the drum, and an ex
pander ring within the drum for clamping the 35
ends of the wrapper to the interior of the drum
to tautly maintain the date-designating portion
around the outer surface thereof.
6. A perpetual calendar comprising a unitary
base structure, an open-ended cylindrical housing
in the base, a drum rotatably supported by the
housing, manually operable means for the drum
forming a closure for the end of the housing, a
drum exposing Window in the base, a series of
openings in the exterior of the drum, a date
designating wrapper with a series of date-desig
nating characters on said drum, a spring-pressed
detent carried by the base cooperating with the
openings in the drum to centralize the date»
designating characters relative to the window, an
opening in the exterior of the drum for intro
ducing the ends of the. wrapper from the exterior
to the interior thereof, and an expander ring
Within the drum for clamping the ends of the
wrapper to the interior of the drum to tautly
maintain the date-designating portion around
the outer surface thereof.
7. A perpetual calendar including a unitary
base structure, an open-ended cylindrical housing
in the base, a calendar unit rotatably supported 60
in the housing comprising a pair of drum mem
bers in end—to~end relationship, independent op
erating means for each of the drums combinedly
effecting an end closure for the housing, Wrappers
for the drums, series of date-designating char 65
acters respectively carried by the drums, windows
in the housing for each of the drums through
which the date-designating characters are pro
gressively visible upon rotation of the operating
means, detent-receiving openings spaced about 70
the periphery of the drum in accordance with the
spacing of the date-designating characters on the
Wrapper thereof, spring-pressed detents carried
by the base and cooperating with the detent-re
ceiving openings for acoentuating the positioning 75
4
2,110,668
of the drums and centralizing the date-designat
ing characters relative to the respective windows
upon movement of the operating means, and
means carried by the base for de?ning the axial
positioning of the calendar unit.
8. A perpetual calendar including a unitary
base structure, an open-ended cylindrical hous
ing in the base, a pair of calendar units rotatably
mounted in the housing respectively comprising
10 a pair of drums positioned in end-to-end relation
ship, independent operating means for the drums
of each unit respectively effecting end closures for
opposite ends of the housing, windows in the base
a plurality of axially aligned cup-like elements in
the casing carrying indicia for selective placing
opposite the sight opening means, one of said
cups having its closed end next to the open end
of another and the closed end of the latter being
next to an opening in a wall of the casing, and
operating means including coaxially related ele
ments each extending through said casing wall
opening and one extending through the closed
end of said other cup to the closed end of said 10
one cup, means acting axially through said
other cup for securing said one operating means
structure for each of said drums, wrappers for
15 the drums with series of date-designating char
acters spacedly inscribed thereon, an opening in
each of the drums‘ for introducing the ends of
the wrappers to the inside of the drums, ex
pander rings carried by the drums for clamping
the ends of the wrappers to the interior of the
drums, spring-pressed detents in said base struc
ture, detent-receiving openings in the drums
spaced at regular intervals vcorresponding to- the
spacing of the date-designating characters and
25 cooperating with the detents for accentuating
successive rotative positions of the drums to
centralize the date-designating characters rela
tive to the windows, and annular grooves in cer
tain of said drums cooperating with respective de
tents for de?ning the axial positioning of the
calendar units.
9. A perpetual desk calendar including in com
bination, a unitary base structure, an open
ended cylindrical housing in the base structure,
35 a pair of calendar units rotatably mounted in
said housing separately comprising pairs of axially
aligned drums, wrappers for the drums with series
of date-designating characters spacedly inscribed
thereon, windows for the drums in the base struc
ture, means secured to the drums for operating
the latter, spring-pressed detents carried by the
base and coacting with suitable openings in the
drums to accentuate the axial positioning of the
calendar units and centralize the date-designat
45 ing characters in line with the windows, expander
rings for anchoring the ends of the wrappers to
the inner surface of the drums, and a pen and
pencil receiving groove in the base structure.
10. A device of the character described, com
50 prising a casing having a wall sight opening, a
rotatable hollow drum in the casing having an
axially extending slot through the wall thereof,
a ribbon like indicia bearing drum wrapper
wrapped taut about the drum with opposite ends
55 inserted through said slot and at least one of
which is return bent on the inside of the drum,
said wrapper being adapted for rotation with the
drum for selectively placing its indicia opposite
said sight opening means, and an expansion ring
60 in the drum holding said wrapper ends against
the inside of the drum.
11. A device of the character described, com
prising a casing having wall sight opening means,
a plurality of axially aligned cup-like elements in
65 the casing carrying indicia. for selective placing
opposite the sight opening means, one of said
cups having its closed and next to the open end
of another and the closed end of the latter being
next to an opening in a wall of the casing, and
70 operating means including coaxially related ele
ments each extending through said casing wall
opening and one extending through the closed end
of said other cup to the closed end of said one cup.
12. A device of the character described, com
75 prising a casing having wall sight opening means,
to said one cup, and spacer means extending
axially through said other cup cooperating with
the closed end of said one cup and with said se
curing means for determining the axial positions
of the cups relative to each other.
13. In a device of the character described, a
casing element of open end cylinder like form
having side wall sight opening means, a rotat
able element in said casing element carrying in
dicia for selective placing opposite the sight open
ing means, and combined means for closing an
open end of said casing element, operating said
rotatable element and holding the combined ‘
means, the casing element and said rotatable ele
ment together, comprising axially opposite shoul
ders on one of said elements about the axis of
rotation of said rotatable indicia element, a mem
ber on the other of said elements radially over- 1)
lapping said shoulders for holding the indicia
element against axial movement in both direc
tions relative to the casing element, a disk like
operating handle for the indicia element cover
ing said open end of the casing element, and
means for holding said combined operating han~
die and cover to the indicia element.
14‘. In a device of the character described, a
base member, an indicia member rotatably jour
naled on the base member, means for operating 40
the indicia member, and double acting means for
simultaneously holding the indicia member azdal
ly in both directions while providing for ro
tation thereof and for slip releasably holding the
indicia member in spring biased accentuated pos 45
ition in any selected indicating position about
the axis thereof, said double acting means com
prising axially opposite shoulders on one of said
members about said axis, and an element on the
other of said members radially overlapping said .
shoulders for holding the indicia member against
axial movement in both directions and providing
for rotation thereof, said element also constitut
ing a detent having spring biased slip releasable
cooperation with notches in said shouldered mem- -
ber for holding the indicia member in any se-
lected indicating position to which the indicia
member is rotated.
15. In a device of the character described, a
base member, an indicia member rotatably jour
60
naled on the base member and carrying an oper
ating handle, and double acting means for simul
taneously holding the indicia member axially in
both directions While providing for rotation
thereof and for slip releasably holding the indicia 65
member in spring biased accentuated position in
any selected indicating position about the axis
thereof, comprising axially opposite shoulders on
one of said members about said axis, an ele
ment on the other of said members radially over
70
lapping said shoulders for holding the indicia
member against axial movement in both direc
tions and providing for rotation thereof, and
spring detent and notch element means having
one of its elements on said holding element and 75
2,110,668
the other on said one member for holding the
indicia member in any selected indicating posi
tion to which the indicia member is rotated.
another accessible at a single hand operating po
sition outside the casing next to said open end,
said stacked disk handles thereby providing for
16. A device of the character described, com
prising a casing portion of open end cylinder like
form having side Wall sight opening means, a
the operator’s hand in one position and shifting
plurality of elements in the casing movable rela
tive to each other and to the casing and carry
ing indicia for selective placing opposite the sight
10 opening means, and combined means for clos
ing an end of said casing portion and operating
said elements including a plurality of coaxially
related operating members operatively connected
through said end to said elements in the eas
15 ing, respectively, and embodying a plurality of
handles in the form of disks stacked directly one
on another accessible at a single hand operating
position outside the casing-next to said open end,
said stacked disk handles thereby providing for
20
5
single hand selective operation by maintaining
the operator’s hand in one position and shifting
?ngers from positions spaced about the periphery
of one of said disk handles to positions spaced
about the periphery of another of said disk
25 handles, one of said disks next to the casing por
tion being of a diameter comparable to the di
ameter of the casing portion and constituting a
direct closure element for said open end and an
other of said disks being of smaller diameter than
30 said closure element disk disposed outside the
casing portion adjacent to said closure element
disk.
17. A device of the character described, com
prising a casing portion of open end cylinder like
35 form having side Wall sight opening means, a
plurality of elements in the casing movable rela
tive to each other and to the casing and carry
ing indicia for selective placing opposite the sight
opening means, and combined means for closing
40 an end of said casing portion and operating said
elements including a plurality of coaxially ‘re
lated operating members operatively connected
through said end to said elements in the casing,
respectively, and embodying a plurality of han
45 dles in the form of disks stacked directly one on
single hand selective operation by maintaining
?ngers from positions spaced about the periphery
of one of said disk handles to positions spaced
about the periphery of another of said disk han
dles, one of said disks next to the casing portion
being of a diameter comparable to the dameter
of, and constituting a direct closure element for,
said open end and having a concave outer side
face, and another of said disks being of smaller
diameter and disposed partially Within said con
cave outer side face.
18. A device of the character described, com
prising a casing portion having Wall sight open
ing means, a plurality of elements in the cas
ing movable relative to each other and to the
casing and carrying indicia for selective plac
ing opposite the sight opening means, and semi
automatic means for actuating said elements in
cluding a plurality of coaxially related operating
members operatively connected to said elements
in the casing, respectively, and embodying a
plurality of handles in closely adjacent positions
10
15
20
25
relative to each other accessible at a single hand
operating position outside the casing, said han
dles thereby providing for single hand selective
operation by maintaining the operator’s hand in 30
one position and shifting ?ngers from one of said
handles to another, and means responsive to
said hand operation for rendering the latter ef
fective including spring biased detent means
operating between the casing and each of said
‘relatively movable indicia elements for auto~
matically e?ecting the ?nal movements of the
operating members independently of the oper
ator’s hand to the selected indicating positions
and slip-releasably holding the operating mem 40
bers in said selected indicating positions, certain
of said spring biased detent means operating
to prevent axial displacement of said indicia
elements.
HENRY JANSSEN.
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