Патент USA US2412719код для вставки
Dec. 17, 1946. C, F_ DAUSMANN 2,412,719 PIEZO-CRYSTAL DEVICE OF THE SEALED TYPE I l_Filed May 5, 1944 fr’A \ \ \ \ \\\\ \`\\\\ \\\ \\ \ \ \ \ \ ATTORN EY salario Y 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.