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Патент USA US2412719

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Dec. 17, 1946.
C, F_ DAUSMANN
2,412,719
PIEZO-CRYSTAL DEVICE OF THE SEALED TYPE
I
l_Filed May 5, 1944
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ATTORN EY
salario
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2. A ypiezo-crystal device comprising a housing
having a cavity to receive a piezo-crystal unit, the
Cover plate s may be recessed to seat the nuts
open end of said cavity forming a seat fora cavity
i3 which engage the threaded bolts li. The nuts
they can only be tight
closure member, a rib projecting above the sur
. i3 may be so formed thuat
face of said seat and surrounding said cavity ‘t0
ened or loosened with a special tool, 4thus pre
venting the'removal oí the cover plate il with an Ul form a sealing edge,‘a projection formed on said
seat adjacent to said rib, a closure adapted to
ordinary screw-driver or other common tool.
register with said seat and to engage said pro
The piezo-electric-crystal unit having been »
jection, and means for forcing said closure against
‘ loaded into the cavity i5, and the spacer il placed
said rib, said projection engaging the rim oi the
above it, the gasket ‘l which may be oi any suit
closure to increase the efficiency oí the seal be
able material such as neoprene, or rubber, is
placed in proper position, and the openings in the
tween the rib and the closure.
3. A piezo-crystal device comprising a housing
metal cover plate 3 are then brought into registry
having a cavity. to receive a piezo-crystal unit,
`’with the threaded bolts ll and the nuts itl are
the open end oí said cavity forming a seat for
a gasket, a sealing edge formed in and adjacent
the inner edge of said seat, a projection formed
in said seat outside said sealing edge, a closure
drawn tight, it being understood that gasket 2
has openings to accommodate bolts li.
yThe sealing edge i2 “bites” into ,the gasket ii,
against the “Bake
as the nuts lîi are tightened
operable under pressure to press a gasket against
lite” cover plate ‘5. I have found that in sorne
said seat, and means for applying pressure to said
cases Where the sealing rib i2 only is used, that
the pressure on plate 3 by nuts i3 necessary to 20 closure whereby said-projection engages the rim
of said closure to increase the eüciency oi’ the
effect sealing may cause the said plate il to bow
seal formed between said sealing edge, a gasket,
upwardly as indicated by the dotted line (Figi),
thus reducing the eiîectiveness of the seal. How
and said closure.
,
4. A piezo-crystal device comprising a housing
ever by using the auxiliary members iii the more
25
having a cavity to receive a piezo-crystal unit,
tightly the cover plate 3 is bolted down against
the open end `of said cavity forming a seat for a
the surface of the end wall of the housing l the
tendency of plate ii to bow is obviated and the
closure for said cavity, a rib projecting above the
surface of said seat to form a sealing edge, a
more eñlcient `:vill be the seal formed between the
sealing edge l2, the gasket 2, _and the cover
'plate t, ‘
Fig. 5 diagrammatically illustrates the location
projection formed in said seat adjacent to said
l
30 rib, said projection extending above the crown of
said rib, a closure adapted to register with said
seat and to engage said projection, and means
for applying pressure to said closure against in
_ the beads lil act as Íulcrums to prevent upward
creasing counter-pressure exerted upon the edge
35
bowing ci plate 3, as the nut-s lil are tightened.
or" said closure by said projection, to increase the ,
The protuberances it may be arranged at suit
eiïicienc'y of the seal formed by said sealing edge '
ably spaced intervals, or they may ‘ce so spaced
ci said closure.
as to deiine the rib sections lf2-«ld (Fig. 6), ar
5. A piezo-crystal device comprising ‘a housing
ranged in spaced relation to the sealing edge i2
having a cavity to receive a piezo-crystal unit,
and the threaded bolts il. The beads lil or the
the open end of said cavity forming a seat for a
rib sections iii-_ld may be slightly higher than
gasket, a rib projecting above the surface of said
the sealing edge i2. This particular construction
seat to form a sealing edge, a projection formed
« enhances the enìciency of the seal, and produces
in said seat adjacent to said rib, said projection
f a very efficient dust-proof and moisture-proof
extending above the crown of said rib, a gasket
housing. Various changes and modifications may
for said seat, a closure adapted to register with
be made in the illustrated embodiments Without
said gasket and said projection, and means for
departing from t‘ne spirit and scope ci the inven
applying pressure to said closure against increas
tion thus instead ci providing the continuous
ingvcounter-pressure exerted upon the edge of
sealing rib i2 on the housing it may be provided
said closure by said projection, to increase the
on plate 3, and likewise for the members lil and 50 eñiciency ci the seal ~formed by said sealing edge, y
ifi. ii desired, the auxiliary rib may completely
said gasket, and said closure.
surround rib l2 in spaced relation thereto, to
» 6. A housing for a piezo-crystal unit having at
least one end open to receive a crystal unit said
provide space for the bolts i l.
one end having an integrally formed sealing edge
What is claimed is:
i. A piezo-crystal device comprising a housing
surrounding the open end adjacent the inner pe
‘naving a cavity to receive a piezo-crystal unit,
riphery, and a plurality or auxiliary sealing edges
a sealing edge for the open end of said cavity,
in spaced relation to the nrst edge for the pur
a projection adjacent to said sealing edge, a seal
pose set forth.
and direction‘of the several forces acting upon
the cover plate 3, from which it will be seen that
. ing 'closure for said cavity, means for fastening
said closure against said sealing edge,`said pro
`jection cci-operating with said fastening means
to increase the emciency of the seal between the
closure and the scaling edge.
«
CHARLES F. DAUSMANN.
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