US2015856A

US2015856A - Electric hot-plate

Info

Publication number: US2015856A
Application number: US702399A
Authority: US
Inventors: Anthony L Lang
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-12-14
Filing date: 1933-12-14
Publication date: 1935-10-01
Anticipated expiration: 1952-10-01

Description

@mo 1,, 11935; A LAN zmmw ELECTRIC HOT PLATE Filed Dec. 14, 1953 2 Sheets-Sheet l [ENT 1 6 ATTORNEYS 1 1935., A. L. LANG zmmw ELECTRI C HOT PLATE Filed Dec. 14, 1953 2 Sheets-Sheet 2 INVENTOR ATTORNEY Patented Get. 1, 1935 UNITED STATES PATENT OFFIQE ELECTRIC HOT-PLATE 2 Claims.

My present invention relates to an improved electric stove or electric heater of the hot-plate or heat-radiating-plate type which, while adapted especially for domestic use, may of course be employed in public service places, as dining rooms, restaurants, etc.

In the physical embodiment of my invention I am, enabled to provide a compactly arranged appliance that is simple in construction and 1-? comprising a substantial minimum number of parts that may with facility be assembled for use, and which may, with equal facility be dismantled as required for repairs or replacements.

The device as thus constructed is comparatively l cheap in construction and in maintenance, and

by means of the special arrangements and combinations of parts, the resistance elements or heating elements are fashioned as a plurality of coils disposed in a heating chamber in such man- 20 nor as to insure a substantially uniform heat throughout the entire area of the heating plate or top of the stove.

The invention consists in certain novel combinations and arrangements of parts as will 25 her inafter be more fully set forth and claimed.

In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention wherein the parts are combined and arranged according to the best 30 mode I have thus far devised for the practical an ation of inciples of my invention, but

uncle Jood that changes and alteracns may be made in the exemplified structure within the scope of my claims without departing 35 from the principles of the invention.

Figure l is a View of an electric stove or heater embodying my invention.

Figure 2 is a perspective View showing the under side of the bottom plate, with the plate 40 broken away for convenience of illustration.

Figure 3 is a p rspective view of a portion of the top plate or hot plate, showing its under side and fins for supporting the heating coils.

Figure 4 is a perspective view of a portion of the bottom plate showing ribs on the upper face of the plate.

Figure a vertical sectional view through the heater or stove.

Figure 6 is a plan View of the underside of the Figure 8 is a plan View of the top or inner face of the bottom plate.

In Figure l where a conventional type of cooking stove is represented as embodying my invention, the supporting frame comprises the usual 5 legs 5 on which is supported a body-frame 2, the parts being secured together by bolts as 3 at the corners of the rectangular frame. While I have shown the stove as of rectangular or square shape, it will be understood that changes 10 may be made as to sizes and shapes of parts, and that the square shape is merely for convenience of illustration and description.

The body frame as best seen in Figure 5 is fashioned with a top flange 4 arranged about the open center 5 of the frame, and the control switch for the electric current is indicated at 6 in Figure l.

The heating unit, as a whole, including the heating elements, is supported by its weight, and without other fastening means upon the top of the body frame, and directly upon the supporting flange of the body frame, and the heating unit, as indicated in Figure 5, projects downwardly within the body frame, in order that substantially the entire unit may be housed in the body frame for conservation of heat, and for the purpose of heating the hot plate or top plate I with maximum efficiency.

This top plate I is fashioned with an overhanging flange 8 that loosely fits about the upper edges of the body frame and the top plate is supsolely on the supporting flange 3 of the body frame, from where it may be removed by lifting the whole unit from the frame. While the heating unit is in place its weight is sufficient to hold or retain it in proper position, and the low center of gravity of the unit insures a stable arrangement of the unit in its supporting frame.

A second, or inner flange 9 of greater depth than the flange 8, is fashioned integral with the underface of the top plate or hot-plate of the stove, and this larger flange projects through the open center 5 of the body frame. The heating unit, as a whole, is thus held against lateral displacement by means of the two flanges 8 and 9 in co-operation with the flange 4 of the bodyframe.

As best seen in Figure 6, the underside of the top plate is fashioned with spaced elements, 00- cupying the area Within the continuous flange 9, which elements form fins that aid in distribution of the heat and also provide supports for the resistance elements or heating elements. These fins comprise a continuous portion ID that sur- 5 rounds the center of the top plate, cross fins II that connect portions of the continuous fin I D, angular fins l2 in three corners of the area within the flange 9, and intermediate straight fins as (3. These fins are of slightly less depth than the depth of the flange 9, and the fins in the various groups are arranged in parallelism with substantial uniformity in spacing one from another, and the under, free edges of the fins are provided with recesses I4, spaced at uniform distances apart. There are here shown four series of recesses surrounding the center of the top plate and concentrically arranged, and each recess or notch is provided with a flanged bushing or spool l5 of non-conducting or insulating material, the bushings being arranged to afford four series of supports for the four wire-coils, resistance elements, or electric heating elements, each indicated as l6. Each of the four concentrically arranged heating elements is supported in its series of bushings, and the coils or heating elements terminate at one corner of the heating area, as indicated at ll, where the cable [8 is connected and proper connection is made with the control switch 6 of Figure 1.

Thus the heating elements are arranged about the center of the hot plate 1 in such manner as to uniformly heat the entire radiating surface or top of p19 s, the central pci'titm of the plate being heated by the surrounding heating elements and the marginal edges of the plate being heated from the adjoining heating elements.

As best seen in Figure 6 the top plate is fashioned with four corner bosses and a central boss as IQ for the bolts 20 that tie the top plate 1 to the bottom plate 2|, and between these plates a heating chamber is formed in which the heating elements are enclosed and from which chamber the heat is radiated through the top plate.

The tie bolts or fastening bolts pass through bosses 22 on the bottom plate and these bosses have bolt holes 23 to accommodate the bolts.

On its underside the bottom plate is fashioned with a continuous edge-flange 24, and at the top of this flange an edge-groove 25 is formed, to receive the lower face of the flange 9 of the upper plate, which flange 9 forms the side wall of the heating chamber of the unit.

An inset flange or rim 25' on the upper face of the lower plate holds the upper and lower plates against relative lateral movement and diagonally arranged reinforcing-flanges 26 are used on the under side of the bottom plate for strengthening the latter.

In addition to the rim 25 and groove 25 of the bottom plate that register with the flange 9 of the top plate, I also provide ribs on the upper face of the bottom plate that register with the fins of the upper plate. Thus the upper face of the bottom plate (as best seen in Figure 8) is provided with angular ribs 21 at three of its corners, with groups of straight ribs 28 that coin- 1 cide with the straight fins l3, and the bottom plate has a central group of intersecting ribs forming a grid 29 at its center. The ribs close the recesses of the coinciding fins and prevent displacement of the bushings [5 that support the 1 several heating coils, and in this manner the coils are retained in their proper positions. By removing the nuts 20a of the bolt 20 the upper plate and the lower plate may readily be separated, and then access may readily be had to the 2 bushings if desired, or to the coils if required, as in making repairs.

With the two plates tightly fastened together, a substantially dust-proof heating chamber is provided in which the heating coils are enclosed g and protected from dust, and of course the bottom plate assists in preventing downward radiation of heat from the chamber.

Having thus fully described my invention, what I claim as new and desire to secure by Letters 3 Patent is:

l. The combination in a heating unit for an electric stove, with a top plate having a depending bottom plate having a rim-rib and ed e groove for co action with the lower edge of 3 d flange, and bolts securing the plates together, of fins having recesses and integral with the top plate, insulating bushings in said recesses, and electrical heating elements supported in said bushings. 4

2. The combination in a heating unit for an electric stove, with a top plate having a depending flange forming a heating chamber, a bottom plate having an edge groove and a rim-rib for co-action with the lower free edge of the flange, 4 and bolts for securing said plates together, of a plurality of integral fins 0n the under face of the top plate, spaced insulating bushings mounted in notches in the free edges of said fins, electric heating elements mounted in said bushings, 5 and ribs on the upper face of the bottom plate coinciding with the fins of the upper plate.

ANTHONY L. LANG.