US790870A - Thermostat. - Google Patents

Description

PATENTED MAY 23, 1905.

H. H. BLAGKMAN.

- THERMQSTAT.

APPLICATION FILED JUNE 10,1904.

i No. 790,870.

Patented May 23, 1905.

PATENT Fries.

HARVEY H. BLAOKMAN, OF ITHAOA, NEW YORK, ASSIGNOR TO CORNELL INCUBATOR MFG. 60., OF ITHAGA, NEW YORK, A CORPORATION OF NET/V YORK.

THERIVIOSTAT.

SPECIFICATION forming part of Letters Patent No. 790,870, dated May 23, 1905. Application filed June 10, 1904.. Serial No. 211,971.

To all whom zit may concern:

Be it known that I, HARVEY H. BLAOKMAN, a citizen of the United States, residing at Ithaca, in the county of Tompkins and State of New York, have invented certain new and useful Improvements in Thermostats, of which the following is a specification.

This invention relates to improvements in thermostats for incubators.

The present invention has for its object the provision of a thermostat whereby the temperature of an incubator may be automatically regulated and one in which the parts are so constructed and related as to occupy but a minimum amount of space in the eggchamber.

The invention also contemplates the provision of a thermostat adapted for quick and accurate response when positioned horizontally, thus rendering the device as sensitive to temperature conditions when the same is in a horizontal position as when vertically placed, and thereby enabling the use of a shallow egg-chamber, with resultant advantages in point of easy and uniform heating.

The invention further aims to provide a device of the character mentioned capable of application to incubators of varying types Without the necessity of changing in the least the construction of the incubator to which applied.

With these general objects in view and others, which will appear as the nature of the improvements is better understood, the invention consists, substantially, in the novel construction, combination, and arrangement of parts, as will be hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the appended claims.

\Vhile the form of the invention herein shown and described is what is believed to be a preferable embodiment thereof, it will of course be understood that the same is susceptible of various changes in the form, proportion, and minor details of construction, and the right is accordingly reserved to modify or vary the invent-ion as falls within the spirit and scope thereof.

In the drawings, Figure 1 is a sectional elevation of the egg-chamber of an incubator having applied thereto a thermostat constructed in accordance with the present invention. Fig. 2 is a perspective view of the thermostatic member as arranged in multiple, one of the plates thereof illustrating a modified construction. Figs. 8 and 4 are similar Views of the supporting bracket and the rocker-arm, respectively. Fig. 5 is a side elevation of another form of use of the thermostat.

Referring in detail to the drawings, the numeral 1 designates the portion of an incubator in which the egg-chamber 2 is included, which may be of any preferred construction.

Arranged upon the top of the chamber 2 is a fulcrum-block 3, upon which is mounted an actuating-lever 4, said lever being fulcrumed at the point 5, and said lever comprises a sleeve 6, in which the sections 7 and 8 of the lever 4 are secured through the medium of clampingscrews 9. The section 7 of the lever at has depending from its free end a damper-disk 10, which latter is applied to the usual form of hot-air generator (not shown) employed in connection with those incubators heated by hot air. Mounted upon the section 8 of said lever 4L is a counterbalancing-weight 11, performing the usual function.

Atube 12 passes through the top of the eggchamber 2 and depends therefrom into said chamber, and mounted upon the lower end of said tube is an inverted-L-shaped supporting-bracket 13. This bracket may be formed of any suitable material and provides a support for the thermostatic member and the intermediate connections with the lever L. The bracket 13 is fixedly connected to the tube 12, and passing upwardly through the latter is a rod 14, the upper end of said rod passing through the sleeve 6 and projecting above the latter, upon which projecting end a thumbnut 15 is mounted, and through the medium of said nut it is obvious that the lever 4 may be adjusted in relation to the rod 14, so that the damper 10 may be operated in accordance with different temperature conditions within the egg-chamber 2. Connected to the lower end of the rod 1 1 is a bell-crank rocker 16, the latter being provided at the junction of its arms with a radially-projecting fulcrumbar 17, the free edge of which is sharpened, as at 18, and is seated in the angle formed by the junction of the horizontal and vertical members of the bracket 13. Thus it will be ,seen that the rocker 16 is capable of free movement upon the edge 18 of the fulcrumbar 17, as will presently appear.

Connected to the vertical arm of the bracket 13 and extending from the face thereof opposite to the rocker 16 is a horizontally-projecting tubular pintle 19, through which extends a rod 20, one end of which is connected to the lower end of the rocker 16 and the other end of which projects beyond the free end of the pintle 19. Arranged upon the pintle 19 is the thermostat proper,21,which may be employed either in a single or multiple form, the latter being shown in the drawings. The thermostat 21 comprises two expansible side bars 22, each of which is bent at only one point intermediate its ends, as at 23, so that the end portions extend at an obtuse angle to each other, and the extremities of said bars are riveted or otherwise suitably connected together. The bars 22 are formed of a highly-expansible material, preferably aluminium; but to counteract any tendency toward longitudinal expansion, and thereby cause the expansion to be in a lateral direction, a stay-bar 24:, of comparatively non-expansible material, is secured between the bars 22. Especial attention is directed to the formation of these bars, the same affording the highest degree of expansion and giving the greatest degree of efliciency, and, as stated, by reason of the staybar 2 1 any tendency to longitudinal expansion is wholly overcome. The bars 22 and 24Care provided with perforations 25, which receive the pintle 19, and thus the bars are free to move on said pintle, but are held thereon from displacement through the medium of a nut 26, carried by the free end of the rod 20 and contacting with the face of the thermostatic member most remote from the supportingbracket 13. As also above indicated, the thermostatic member may be arranged either in single or multiple form, and when the latter is desired any number may be employed. The supporting-bracket 13 is also provided with a pair of parallel-spaced guide-lugs 27, between which the vertical arm of the rocker 16 is adapted to work, and arranged at the opposite face of the bracket 13 is a horizontally-extending guide-arm 28, through the medium of which the thermostatic member is prevented rotating on the pintle 19.

While the preferred formation of the bars 22 is effected by employing the bend 23, this, however, is not essential, for each bar may be formed of two separate sections 29, connected through the medium of a hinge-joint 30, as

clearly shown in Fig. 2, and in such event it is obvious that the sections may have free movement relatively to each other and at the same time afford the necessary degree of expansion.

In Fig. 5 is illustrated another embodiment of the invention, whereby the latter is adapted for use in a vertical position in contradistinction to the horizontal position illustrated in Fig. 1. The construction illustrated in Fig. 5 is essentially the same as in Fig. 1, with the exception that the bell-crank rocker is omitted and with the exception of the formation of the supporting-bracket 13, and in Fig. 5 this is illustrated as being devoid of the angled portion and the guide-lugs 27, the remainder of the bracket serving the functions before set forth. Moreover, the thermostatic member abuts below the lower end of the tube 12 and has its lower surface bearing upon a nut 31, carried by the lower end of the rod 1 1. Thus it will be seen that when the thermostatic member expands and contracts its motion'will be imparted, through the rod 14:, to the lever 1, thereby actuating said lever to produce corresponding movement of the damper-disk 10.

With the parts assembled as in Fig. 1 it will be seen that when the thermostatic member is actuated under temperature conditions its movement will be imparted to the rocker 16 through the medium of the rod 20, and said movementis transmitted from the rocker 16, by means of the rod 14, to the lever 4, the latter actuating the damper 10, and thereby regulating the amount of hot air fed to the egg-chamber. If at any time it be desired to change the adjustment of the connections between the thermostatic member and the lever 1, the same may be accomplished by operating the thumb nut 15, thereby adjusting the throw of the lever 4 under the influence of the thermostatic member, whereby the damper 10 may be actuated at either a higher or lower temperature of the egg-chamber, as is apparent.

I am aware that there is in use a thermostatic member formed of an intermediate strip to each side of which a curved diaphragm-strip is secured by bolts or rivets at each end; but the construction of said diaphragmstrip or side bar provided with a bend at an obtuse angle at its middle point, said angle having straight sides, or provided with a hinge-joint so angled at said point and combined with a means to prevent longitudinal expansion is believed to be new. In the ordinary curved bar, expansion is exerted outward on each point of the curve, and the one point of its contact for transmission with the regulating means is less affected than in the use of our straight sides, contacting at the obtuse angle, as it will be noted that therein the entire expansion of each bar lengthwise, will exert a combined force at the point of contact, and this is pointed out as an obvious advantage in the present invention.

Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, is

1. In a device of the class described, the combination with a thermostatic member, of a supporting-bracket, a pintle carried by said bracket and upon which said thermostatic member is mounted, a bell-crank rocker operatively related to said supporting-bracket and connected to the thermostatic member, a damper, and connections between said damper and rocker, whereby the latter is adapted to operate the damper under the influence of the thermostatic member.

2. In a device of the class described, the combination with the thermostatic member formed of two expansible side bars each of which is bent at only one point intermediate its ends so that the end portions extend at an obtuse angle to each other, of a supportingbracket upon which said thermostatic member is mounted, a bell-crank rocker operatively related to said supporting-bracket and connected to the thermostatic member, a guard-arm carried by the supporting-bracket to prevent rotation of the thermostatic member, a damper, and connections between said damper and said rocker, whereby the latter is adapted to operate the damper under the influence of the thermostatic member.

3. In a device of the class described, the combination with a thermostatic member formed of two expansible side bars each of which is bent at only one point intermediate its ends so that the end portions extend at an obtuse angle to each other, of a supporting-bracket, a tube from which said supporting-bracket is suspended, a bell-crank rocker operatively related to said supporting-bracket, a pintle carried by said supporting-bracket and upon which the thermostatic member is mounted, a rod passing through said pintle and conmeeting the bell-crank rocker with the thermostatic member, a damper, and a rod passing through said tube and connecting the bellcrank rocker with the damper, whereby the latter is operated under the influence of the thermostatic member.

4. In a device of the class described, the combination with a thermostatic member formed of two expansible side bars each of which is bent at only one point intermediate its ends so that the end portions extend at an obtuse angle to each other, and the ends of said bars being oppositely secured to the ends of an intervening stay-bar of comparatively nonexpansible material, of a supporting-bracket, a tube from which said supporting-bracket is suspended, a bell-crank rocker operatively related to said supporting-bracket, a pintle carried by said supporting-bracket and upon which the thermostatic member is mounted, a rod passing through said pintle and connecting the bell-crank rocker with the ther-. mostatic member, a damper, and a rod passing through said tube and connecting the bellcrank rocker with the damper, whereby the latter is operated under the influence of the thermostatic member.

5. In a device of the class described, the combination with a thermostatic member, of a supporting-bracket, a tube from which said supporting-bracket is suspended, a pintle carried by said supporting-bracket and upon which the thermostatic member is mounted, a guard-arm carried by the supporting-bracket to prevent rotation of the thermostatic member, a damper, and connections between said damper and the thermostatic member, whereby the latter is adapted to operate the damper.

6. In a device of the class described, the combination with a thermostatic member formed of two expansible side bars each of which is bent at only one point intermediate its ends so that the end portions extend at an obtuse angle to each other, and the ends of said bars being oppositely secured to the ends of an intervening stay-bar of comparatively nonexpansible material, of a supporting-bracket, a guard-arm carried by the supporting-bracket to prevent rotation of the thermostatic member, a tube from which said supportingbracket is suspended, a hollow pintle carried by said supporting-bracket and communicating on a line with said tube, and upon which pintle the thermostatic member is mounted, a damper, and a rod passing through said pintle and said tube and connecting said damper with the thermostatic member, where by the latter is adapted to operate the damper.

In testimony whereof I aflix my signature in presence of two witnesses.

HARVEY H. BLAGKMAN.

IVitnesses:

T. K. BRYANT, ELIZABETH G. HOPPER.

Images