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Publication numberUS2088586 A
Publication typeGrant
Publication dateAug 3, 1937
Filing dateJun 29, 1935
Priority dateJun 29, 1935
Publication numberUS 2088586 A, US 2088586A, US-A-2088586, US2088586 A, US2088586A
InventorsCole Harry W, Marr George M
Original AssigneeAir Conditioners Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Immersion heater
US 2088586 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Aug, 3, 1937. H. w. COLE ET AL IMMERS I ON HEATER INVENTOR W ('0 le Filed June 29, 1955 Harry Bgeorge M.Ma.rr

ATTORNEYS Patented Aug. 3, 1937 UNITED STATES PATENT OFFICE Marr, Woodhaven, N.

ditioners, Inc., New tion of Delaware Application June 29,

2 Claims.

Heaters of the type specified usually consist of closed casings or tubes in which the heaters are mounted, the heater units being insulated from the casing. When such heater units are heated to high temperatures any air trapped in the casing will be expanded and tends to puncture the seal and cause leakage into the casing.

This invention has for its salient object to pro vide an immersion heater of the character described so constructed and arranged that it will be tightly sealed and will not leak after it has been heated to high temperatures.

Another object of the invention is to provide a heater of the character described with contact terminals or members so mounted in the contact block as to prevent current leakage between the contact members or terminals and between said members and heater casing.

Another object of the invention is to provide a heater of the character described that is rugged in construction and will not be damaged or broken by rough usage.

Further objects of the invention will appearfrom the following specification taken in connection with the drawing which forms a part of this application, and in which Fig. 1 is a longitudinal sectional elevation of the heater constructed in accordance with the invention;

tact terminals and block in which they are mounted; and

Fig. 3 is an end elevation of the casing with the terminals extending therethrough'prior to the securing of the contact block in position.

The invention briefly described consists of an immersion heater comprising a casing having a heater unit mounted therein between closed ends of the casing, contact members projecting through one end and secured to a contact block. The heater units are secured to a block adapted to fit within one end of the casing and the block and terminals are secured to the closure for said casing end. After these parts have been secured in position the space between the heater unit and This is particularly dan- Fig. 2 is an enlarged end elevation of the con- Y., assignors to Air Con- York, N. Y., a corpora- 1935, Serial No. 29,050

the casing wall is filled with suitable insulating material, such as dry cement, this material being tamped in to tightly surround the heater unit and fill the space between the unit and the casing. The casing is then heated by an external application of heat and this causes any air in the casing to expand. When the casingv is heated to a high temperature the open end thereof is sealed and after the casing cools a partial vacuum will be formed therein. Thereafter, when the heating unit is heated by an electric current no expansion of air in the casing will take place and therefore the seals at the end of the casing will not be punctured.

Further details of the invention will appear from the following description.

In the particular embodiment of the invention illustrated, the immersion heater comprises a casing H) which consists of a metallic tube, one end of the casing being flared, as shown at H. To the flared end II is secured, in any suitable manner, as by brazing, a disc or closure I2.

The heater unit may be of any suitable construction and preferably comprises a core [5 of suitable insulating material, the core preferably being formed in sections which are mounted on the centrally disposed rod IS. The rod I6 is secured to a block I! of suitable insulating material, such as lava, and a nut l8 at the other end of the rod secures the core sections thereon.

The core l5 has formed therein spiral grooves I9 in which is mounted the heating wire 20, one end of the wire being shown at 2| and the other end being shown at 22. The wire is looped, as shown at 23, around a lug 24 disposed adjacent the end of the core IS.

The end 2| of the heater wire 20 is connected to a contact member or terminal 25 and the end 22 is connected to a similar terminal 26. These terminals consist of screws which are countersunk, as shown at 21, in the block l1. On each screw is mounted a nut 28 which is also countersunk in the block IT, as shown in Fig. 1, and secures the screw to the block. A brass washer 30 is disposed above or outside the nut 28 and a mica washer -3l is disposed above the washer 30 and beneath the closure or disc l2. An insulating washer 32, preferably of mica, is disposed above the washer 30 and insulates the terminal 50 member or screw 25 or 26 from the disc l2, the washer 30 spacing the screw from the opening 33 in the disc l2. Above the disc l2 or outside 5 thereof is disposed a washer 35 of mica or suitable insulating material and a brass washer 35 is dis- 55 posed outside the washer 35. A nut 31 engages the outer surface of the washer 36.

In the foregoing manner the terminal members or screws 25 and 2,6 are firmly secured to the block l1 and disc or closure l2 and are effectively insulated from the closure.

On the outside of the closure I2 is mounted a terminal block 40 formed of suitable insulating material and having countersunk openings 4! in the bottom thereof which receive the washers and nuts Just described. The screws 25 and 26 extend outwardly through openings 42 and 43, the

outer ends of the screws being disposed in pockets or recesses 44 and 45 which are separated by a central wall 45. The block is secured in position by nuts 41 and 48 which are mounted oh the screws and washers 49 and 50 are disposed between the nuts in the block. In addition to being secured by the nuts the block is preferably cemented to the closure I2. I

The block 40 is recessed in the manner described to form the pockets 44 and 45 in order to prevent current leakage between the terminals 25 and 25 and also between these terminals and the casing l0. It will be obvious that the length of the paths between these parts is sufiicient to prevent such leakage.

After the closure l2, block I I and terminals 25 and 28 have been secured and sealed to the flared end of the casing III, the space between the heating unit and the casing wall is filled with suitable insulating material, such as dry cement 55, which is tamped in to tightly fill this space. Heat is then applied to the outer surface of the casing ID in any suitable manner, as by a blow torch and this will cause any air in the casing to expand. While the casing is still heated to a high temperature the outer end thereof is sealed by a closure 58 which is brazed in the end of the-casing, as shown at 51; After the cement 55 has been tamped in and before the closure is secured in position a washer 58 may be inserted, as shown in Fig. 1, this washer being formed of insulating material, such as mica. packing of insulating material may then be tamped in outside at the washer before the closure 50 is secured.

A further 5 When the heater is constructed in the manner just described there will be a partial vacuum therein since the air was expanded by heat and the end of the casing was sealed when hot. As the heater cooled the contraction of the air formed the partial vacuum. Since this condition exists within the casing it will be obvious that the heating unit can be heated to a high temperature, but will not cause any expansion of air within the casing or puncture the seal.

It will be obvious from the foregoing description that the immersion heater constructed as described will be rugged in construction and that no leakage will take place.

Although one specific embodiment of the invention has been particularly shown and described, it will be understood that the invention is capable of modification and that changes in the construction and in the arrangement of the various coopcrating parts may be made without departing from the spirit or scope of the invention, as expressed in the following claims.

What we claim is:

1. An immersion heater of the character described comprising a casing, an electric heating element in the casing, a terminal block sealed to one end of the casing, contact terminals carried by said block and extending therethrough and connected to the ends of the heating element, and dry insulating packing surrounding the heating element and insulating said element from the casing, a partial vacuum existing in said casing.

2. An enclosed heater comprising a tubular casing, a closure for each end thereof, sealed thereto, an insulating block disposed within the casing and secured to one closure, a heater unit connected to said block and extending longitudinally in the casing, contact members connected to said unit and extending through and insulated from the closure, said members being sealed to said closure, and closely packed insulating material in the casing enclosing and surrounding the heater unit, said casing having a partial vacuum therein.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2508512 *Jan 13, 1949May 23, 1950Phillips Mfg Company IncImmersion-type heater
US2654820 *May 26, 1950Oct 6, 1953Thermal Syndicate LtdElectric immersion heater
US2824199 *Apr 4, 1955Feb 18, 1958Acra Electric CorpElectrical heating element
US2856501 *Apr 25, 1955Oct 14, 1958Knapp Monarch CoElectric baker
US3089016 *Aug 17, 1959May 7, 1963Ferro CorpHeating unit
US4510377 *Feb 6, 1984Apr 9, 1985The United States Of America As Represented By The Secretary Of The Air ForceSmall cartridge heater
US5235737 *Dec 28, 1992Aug 17, 1993Gellert Jobst UMethod of making an injection molding nozzle with a heating element extending outward between adjacent collar portions
US5800493 *Apr 26, 1995Sep 1, 1998Gynecare, Inc.Intrauterine ablation system
US6394784Mar 8, 2000May 28, 2002Mold-Masters LimitedCompact cartridge hot runner nozzle
US6561789Dec 26, 2001May 13, 2003Mold-Masters LimitedCompact cartridge hot runner nozzle
US6638053Dec 26, 2001Oct 28, 2003Mold-Masters LimitedCompact cartridge hot runner nozzle
US6761557Jun 20, 2003Jul 13, 2004Mold-Masters LimitedCompact cartridge hot runner nozzle
US7108502Jun 23, 2003Sep 19, 2006Mold-Masters LimitedHot runner nozzle with interlaced heater and sensor
US7377768Aug 28, 2006May 27, 2008Mold-Masters (2007) LimitedHot runner nozzle with removable sleeve
US7413432Mar 2, 2007Aug 19, 2008Mold-Masters (2007) LimitedCompact cartridge hot runner nozzle
US7438551Mar 13, 2007Oct 21, 2008Mold-Masters (2007) LimitedCompact cartridge hot runner nozzle
US7703188May 17, 2006Apr 27, 2010Mold-Masters (2007) LimitedThermal shroud and method of making same
US20030228390 *Jun 20, 2003Dec 11, 2003Mold-Masters LimitedCompact cartridge hot runner nozzle and method of making
US20040037913 *Jun 23, 2003Feb 26, 2004Mold-Masters LimitedHot runner nozzle with interlaced heater and sensor
US20050181090 *Dec 4, 2003Aug 18, 2005Mold-Masters LimitedInjection molding nozzle with embedded and removable heaters
US20060263469 *May 17, 2006Nov 23, 2006Mold-Masters LimitedThermal shroud and method of making same
US20060292256 *Aug 28, 2006Dec 28, 2006Gellert Jobst UHot runner nozzle with removable sleeve
US20070148279 *Mar 2, 2007Jun 28, 2007Mold-Masters LimitedCompact Cartridge Hot Runner Nozzle
US20070154588 *Mar 13, 2007Jul 5, 2007Mold-Masters LimitedCompact Cartridge Hot Runner Nozzle
US20100233310 *Mar 24, 2010Sep 16, 2010Mold-Masters (2007) LimitedThermal Shroud and Method of Making Same
US20140110398 *Oct 10, 2013Apr 24, 2014Tokyo Electron LimitedHeater apparatus
U.S. Classification338/241, 338/237, 338/274, 392/503, 338/270, 392/501, 219/523
International ClassificationH05B3/78
Cooperative ClassificationH05B3/78
European ClassificationH05B3/78