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Патент USA US2404842

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Patented July 30, 1946
A`l..IfNsjIîT151D L-S TATiEtS
;John;N. Hoekstra, Royalf.10ak,¿Mich.
ApplicationfSeptember 23, 19.44„.SerialjBT05555532
Vi4 Claims.
"I‘his'inventionrrelates to alarm systems ‘fthe
Apurpose `being to providela new and improved
mally extends iinto ‘the lmercury Vin ‘the ~~cup T9
" and ft‘his- mercury Vcup -torms’ipart `‘of «"the 'electric
circuit Iil which‘includes la lcoil ïI l A‘on the‘stylus
means >for‘transmitting -a message as by "mean-s
of a telephone system in the case of-~a ñre toi'
A‘feature of the invention resides î‘in the'use
‘of a‘strip of material -having‘a groove Iformed
'therein similar‘to the groove -in -a `phonograph
Y-record and by means’ofIvvhich a spoken message
maybe transmitted to vaV telephone circuit and is "10
I2 which rides the groove. _WhenithermagnetL/S
fis attracted lby îthe‘ metallic ‘ portions ~`of ‘the "strip
the 'stem 8 ‘is Amoved lout _of contact with fthe
mercury in "the cup 9 -as is indicated in Fig. 13
which is the normal position of the parts.
In‘Fig. 5 Ais ’shown va `means for 'closing the
vrepeated at'successive intervals.
bellows element I3>and `a secondfbellows lelement
These and iother Vobjects and features of the
‘invention are hereinafter ~more >>fully described
and 'claimed and 4whichiis ‘shown'in'the laccom
I4 _connected A4by a :tube I5.
The bellows j'ele
gaseous or liquid ‘and inthe event of
panying `drawing in “which
Fig. 1 is an `_illustration»partly 0diagranimatie
Vweight I’S is dropped which-compresses the bel
‘lows >It?, and Mexpandsfthe bellows Id to 'Contact
“of the apparatusembodying myïinvention.
with one end ofthe 1ever’I“ÍI,"tl'1e-opposite'end
of which‘is provided with aibrake 'shoe I3 nor
Fig. ‘l2-is a _cross 'section Vthereof 0at îthe point
of ‘contacto'f the; needle "with‘ the groove.
Fig. 3 is a `diagrammatic 4‘vien/'showing the
reels ion which the‘tape’is Wound.
Fig. 4 is a similar View 'showing ‘a somewhat
'different .arrangement `of ‘parts
Fig. 5 ‘ is. a diagram showingmeans fior .causing
operation ofthe apparatus.
The apparatus is usable in buildings whereg‘ñres
may occur ‘andin the operation ofthe apparatus
a spoken message'istransmitted'to the telephone
station.,giving.the location of the fire.
'In‘the preferred arrangement of parts a strip
I is formed with a longitudinal groove 2 and this
portion of the strip is non-magnetic in character
while the portion indicated at d and 5 is magnetic
and the message is formed in the groove between
these magnetic elements which serve to separate
repeated messages, or to provide a time interval
between differing messages.
The groove extending across the metallic ele
ments as indicated at 2a is a straight line and
mally “held _in surface -contact with 'the Ksurface
Of‘the Wound tape on‘the-'spool :IS-and normally
prevents-rotation ofthe‘reel. ‘The expansion of
‘the'bellows‘ member I4,releases thebrake carried
on ‘the 'end of „theäpivoted arm il, and as the
'Weight continues'to .rest on `the bellows it, the
25‘ bellowsi'ii is maintained in expanded condition
"by the’fluid thereinandpermits‘the reels to .con
'tinue in rotation _as long _as ‘thespring motor is
operated. 'The supporting _means 'for ithebellows
membersmay be oif anyapproved ~form` and' is _not
30 here shown.
While I have provided the strip I with grooves
similar to that of a phonograph, the invention is
not conñned to such character of means for
transmitting the message as it may consist of
dots and dashes as in a telegraph system. Any
type of message may be transmitted depending
upon the character and requirement of any par
ticular installation. The strip may be formed of
a series of magnetic and non-magnetic elements
the strip is suiìciently long to permit repeated 40 so arranged as to transmit the desired informa
tion as by a dot and dash system used in teleg
messages on the portion I at successive intervals
and the direction of movement of the strip is
It will be noted that in Fig. 2 the strip I is
indicated by the arrow in each of Figs. 1, 3 and 4.
supported by means of grooved wheels 2I and 22
The apparatus consists of a permanent mag
net 6 which may be mounted in any approved 45 as indicated in Fig. 24. These Wheels are to be
understood as being rotatably mounted on a sup
manner, as for instance by means of the arm 'I
porting element (not here shown) in a manner
shown in Fig. 4, which is flexible in character.
The weight of the magnet 6, as shown in Fig. 4,
causes the saine to normally occupy a position
out of Contact with the strip. The magnet how
ever is suñîciently close to the strip to be at
tracted by the magnetic elements 4 and 5 and
there may be one or more such strips and in
fact may be of one piece of metal of the desired
length. The magnet 6 has a stem 8 that nor
tending to prevent lateral displacement »of the
strip adjacent the point of contact of the stylus
50 I2 with the groove. The grooved wheel 2| may
be mounted in a stationary member 23 While the
Wheel 22 may ride in a slot in the supporting
member 24 and may be spring pressed to Contact
with the one edge of the strip I as by means of
the spring 25 connected with the spindle of the
wheel 22 by a bar 26. This arrangement pre
vents lateral displacement of the strip I. It is
movement of the stylus in the coil I2 that causes
iluctuation in the electric circuit in which the
wires l0 and Illa are connected indicated at Ila
and IIb in Figs. 1 and 4 and thereby causes
fluctuation in the said lines and thence to a re
ceiver (not here shown).
It is to be understood that the speed of move
ment of the strip having the groove correspond
ing to the groove in a phonograph record should
correspond to the speed of movement of the
phonograph record. relative to the needle. The
invention, however, is not confined to a groove
whereby successive messages may be transmit
ted to a receiving station, means tending to nor
mally maintain the motor reel stationary, and
means whereby the reel may be released to rota
tion by the motor and thereby transmit the mes
sage to the telegraph or telephone circuit.
2. An alarm system comprising a tape formed
of a thin strip of material formed of magnetic
and non-magnetic sections, the nonemagnetic
sections of the tape having `a'groove in its sur
face similar to the groove of a phonograph record,
` a stylus for engaging the groove, a pair of reels
in spaced relation on which the tape is wound,
one of the reels being rotatable as by means of
similar to the phonograph groove as the groove 15 a coiled spring to thereby move the tape Yacross
may be so formed as to transmit a message similar
the stylus, an electric system in which the stylus
to that of a telegraph recording tape.
is connected to cause current iiuctuation therein
It is believed evident from the foregoing de
due to vibration of the Stylus traversing the
scription that the various features and objects»
groove of the non-magnetic sections, and means
of the invention are attained by the means here 20 including a magnet stationarily positioned adja
in disclosed. , It is pointed out however that var
cent the surface of the tape opposite that engaged
ious changes may be made in the character and
by the stylus and adapted to break- the circuit
relationship of parts within the scope of the ap
due to its being attracted by the magnetic portion
pended claims.
of the tape.
` Having thus brieñy described my invention, its
utility and mode of operation, what I claim and
desire to secure by Letters Patent of the United
3. In an Valarm system, a tape formed of a thin
strip of material having magnetic and, non-mag
netic sections in alternate relation, the non-mag»
netic sections having va grooveA in the surface>
` 1. An` alarm system for automatically trans
Vthereof similar to the groove in a phonograph
mitting a message to a telegraph or telephone cir 30 record, and the magnetic sections having a groove
cuit, comprising a tape of thin material Íormedof
therein on a straight line connecting with the
Va series of sections of a desired length separated
respective. ends of the non-magnetic sections, and
bysections of magnetic material, means by which
means whereby traverse of the groove by move
the tape may be moved comprising a spring mo
ment of the tape beneath the stylusV transmits
tor including a wheel like portion on which the` 35 successive messages to an electric circuit substan
`tape may be wound, a, brake means tending to
tially as described.
. , j
hold the wheel portion from rotation, means for
4. In an alarm system, a tape having a groove
causing release of the reel to rotation by its mo
in the surface thereof, means for causing move
tor whereby rotation thereof winds the> tape
ment of the tape, `a stylus for riding the groove,
thereon, said tape having magnetic and non~ 40 an electric circuit in which the stylus is con~
magentic sections arranged end to end in a single
nected, a coil therein in which the stylus is> posi
strip, the non-,magnetic sections having a groove
.tioned, the groove having successive `spaced por
in the face thereof similar to the groove of a
tions thereof 'of such form as to cause variations
phonograph record, a stylus for riding the groove,
in the position of the stylus in the coil to thereby
means whereby Vibration of the stylus due to the 4,5 cause fluctuation in the electric circuit and por~
character of the groove in the non-magnetic
tions therebetween non-productive of current
.section causes a fluctuation in an electric circuit,
ñuctuation whereby a message may be trans
means actuated by said magnetic sections tend
mitted to the circuit at successive time intervals.
States is:
ing to break the circuit to the telephoneor tele
graph system and providing an arrangement
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