US2268176A - Thermostatic unit - Google Patents

Description

Dec. 3o, 1941. J E WOODS 2,268,176

' THERMOSTATIC UNIT Filed June 4, 1940 i Y @www MW bha,

' TAWMW www,

ing legsA 29. t bonded to the bottom of the cup preferably by Patented Dec. 30, '1 941 UNITED STATES PATENToF -2,268,176 Fics I v THERMUSTATIC UNIT John E. Woods, Brookline, Mass., assigner to Cliord Manufacturing Co., Boston, Masa., a

corporation of Delaware Application Janet, 1940, serial No. 338,747

1 claim. (cl. 297-8) The present invention relates to improvements in thermostatic units, and is more particularly concerned withM improvements in such units which embody a sea1edin actuator and attached capillary for remote control. i

The object of the invention is to improve and reorganize such units for the purpose of increasing thereliability and ruggedness asv handled in the ordinary application, and with the above andother objects in view, the various features of the invention consist in certain novel features of construction, combinations and arrangeend of the capillary is sealed to the cup bottom.

By spacing. the bridge and opening I6 upon the same diameter at opposite sides of the centena substantial length of the capillary is supported in comparison with the diameter of'the cup, and a superior resistance isobtained as compared withy the support of the capillary in close proximity to its entering point.

ments of parts hereinafter described and claimed, the advantages of which will be obvious to those skilled in the art from the following description.

In the accompanying'drawing illustrating the preferred form of the invention, Fig. 1 represents a bottom plan view of the unit; and Fig. 2 is a section in elevation of the unit beforeinsertion of the capillary.

Upon inspection of the drawing, -it will be ob-l l Y necked opening I6 and sealed or bonded thereto by solder 24 as indicated. The lengthwise portion of the capillary contacts with and lies against the flat bottom portion extending from the opening diametrically across the bottom to an external point beyond the margin.

The length of the capillary is positioned and reinforced by a clip 25, which as shown in Fig.v

2 may take the form of a raised bridge or guiding portion 21 formed integral with two anchor- These legs engage with and are The cup-shaped housing encloses an operating diaphragm which is sealed therein and is sube ject to the fluctuations in pressure introduced into the interior 32 of theshousing through the capillary. This diaphragm may be of the form indicated in Fig. 2 in which a dished head portion 34 forms part of a two-fold bellows wall 36 provided with an enlarged fold 38 which is bonded to the wall of the cup-shaped housing and serves to anchor the diaphragm in posi. tion. Subject to fluctuations of pressure within the space y32, the movable wall 341 -is raised and lowered nto control an external operating member.

Asdndicated again in Fig. 2, the entire assembly withi the 'housing is enclosed by a disk-l like cover 40 bonded at its outer periphery to the housing at 42, the edge of the c ver, as shown,

seating within a recess 44 formed in the wall of the housing. The interior of the Acover is provided with a central opening 46, which rests upon the head of the diaphragm and limits outward movement, a sealing disk 48 being inter? posed' therebetween to seal the interior of the diaphragm inthe outward position. Attached to the movable head 34 may be a U-shaped bracket 50 which projects beyond the cover and servesv as .a connection forI operating any appropriate inenclosing the' diaphragm, the housing spot welding, and the raised bridge portion uaffords sumcient space therebetween and the bottom of the cup for` the passage of the capillary tubing.

The opening 30 presented by the bridge faces the opening in the cup bottom and is generally aligned with the longitudinal axis of the capillary which passes therethrough. 'I'here may be a slightclearance between the capillary and bridge .when in position to permit insertion of the capillary after the bridge has been secured to the cup bottom.

strumentality such as a switch. l

What is'claimed is:

`A thermostatic unit comprising a movable diaphragm, a cup-shaped housing of drawn metal ,includingj an integral bottom provided with a recessed portion having formed therein an inwardly vextending necked opening of smaller diameter than the recess, a length of capillary tubing having an end portion turned angularly with respect to its length and received within the necked opening, the portion of the capillary in the vicinity of the turn being free of the recessed portion of the housing to permit a continuous circular bond by soldering or the like betweenf'capillary and housing around the necked opening, the length of capillary lying in juxtaposition to the bottom portion of the cup and extending outwardly beyond the margin, and means for anchoring the capillary to the bottom ofthe housing at a point remote from the point of connection adjacent the y necked opening, said anchoring means comprising a clip bridging the capillary and secured to the bottom of the housing.

y t .JOHN E. woons.

Images