US1828809A - Electric heater - Google Patents

Description

Oct. 27, 1931. L D s 1,828,809

ELECTRIC HEATER Filed July 19, 1929 2 Sheets-Sheet l 7 5 v INVENTOR H. G. Land L13 Oct.27, 1931. H. G. LANDIS 1,823,309

ELECTRIC HEATER Filed July 19. 1929 2 Sheets-Sheet 2 Q N t:

t\ INVENTOR H,G.Lar1di8 Q .LLW.

ATTORN EY Patented Oct. 27. 1931 PATENT OFFICE HUGH G.'LANDIS, 01' LOS ANGELES, CALIFORNIA ELECTRIC HEATER Application filed July 19,

This invention relates to electric heaters.

tionare to construct and arrange the parts of the heater in such a manner that the heater is more efficient, more compact and of neater appearance and much less costly to manufacture than the former device. Also the arts are so assembled that any part may e readily removed when necessary for ins ction or replacement or to. facilitate the s ipment of the device in a minimum of space. I I

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views.

Fig. 1 is a side elevation of my improved heater.

Fig. 2 is a top plan view of the same with j 'the cover removed.

Fig. 3 is a transverse vertical section of the heater.

Fig. 4 is a fragmentary cross section on the line44ofFi .3. Fig. 5 is a ragmentary view showing a modified form of guard.

Referring now more particularly to the characters of reference on the drawings, the main body of the heater is a one-piece cylindrical element comprising an outer wall 1, an inner wall 2 and an intermediate wall 3 all concentric with and spaced from each other.

4 which are relatively narrow in a horizontal plane. The intermediate and outer walls are connected at the top by a continuous solid web 5 and at the bottom by radial ribs 6 preferably relatively narrow in a vertical plane. The body is supported a certain distance from the fioor by a plurality of legs 7 which at their upper ends have flat pads 8 59 abutting against the outside of the outer wall The inner and intermediate walls are con nected only toward the bottomby radial ribs and the top of the web 5 the studs are formed 1929. Serial no. 879,433.

1. Each pad has vertically spaced dowel pins 9 projecting through the .wall, a removable securing bolt 10 between the dowels and a lug 11 to project under the wall. Each leg is thus removably secured in place by only a single bolt. while at the same time it I is rigidly held from lateralor vertical movement independent of said bolt. This ready removability of the'legs is a great convenience in shipping the device, as will be evident, and the subsequent remounting of the legs may be easily accomplished by anyone without any special skill or tools being necessary.

The area enclosed by the inner wall 3 forms a chamber for the reception of an electric motor 12 which is disposedon a vertical axis; said chamber having lugs 13 projecting inwardly at the bottom to engage the bottom of the motor and limit the downward movement of the same. On top the motor s engaged by a ring 14 removably fitted inside the wall 2 and held against removal by a split spring ring 15 removably seated in a groove 16 provided in the chamber wall adiacent the top. A dished screen 17 covers the area included by the intermediate wall and is removably secured thereto at the bottom.

Spaced a certain distance from the top of the body is a solid cover cap 18 having a depending side flange 18a all around the same;

a flat disc 19 extending across the cap area in the plane of the bottom edge of the flange.

.This disc bears against the bottom surfaces of bosses 20 depending from the cap. vertical studs 21 being secured in and depending from said bosses and extending through the top web 5 of the body to which they are removably secured by nuts 22 accessible from the bottom of the open space between the walls 1 and 3. Between the lower face of the disc with enlarged portions 21a so as to hold the disc firmly clamped against the boss and also definitely locate the disc and cap in spaced relation to the bodv. Fixed on the upper end of the motor shaft 23 and fitting c osely between the disc and the top of the body is a multi-blade' fan'24 of the centrifugal type, the blades overhanging the open area between the walls 2 and 3. Between the disc and the web 5 outwardly of the fan a foraminous guard band 25 is mounted. This band preferably comprises a length of stiff wire bent l to form vertical and spaced convolutions throughout its length, the lower ones of WhlCh convolutions seat in a circular groove 26 formed in the upper surface of the web 5,

while the upper convolutions merely bear closely against the disc. The band therefore needs no other securing means to prevent its removal or displacement since it is held against upward movement by the disc and against lateral movement by the seating groove.

The open area between the walls 2 and 3 forms a chamber for the heating unit which comprises resistance wires 27 of the usual helical type, preferably arranged as a pair of transversely spaced and helically extending coils. The ends of these coils are attached to terminals 28 which are secured in vertically disposed mica plates 29, some of which also support the coils intermediate their ends. The plates are preferably bound with metal edgings 30 to strengthen the same and prevent their splitting and warping. The plate members are removably supported on the ribs 4 which are grooved along the top as at 31; other vertical grooves 32 beingcut in the adjacent faces of the walls 2 and 3 in line with the ends of the grooves 31 and extending to the top of the body. The plates maythus he removably slid into place from the top of the body and are then held against displacement in any direction without any securing means being necessary. The termi- 'nals 28 and the rotorof the motor are con- 7 nected by suitably arranged wires (not shown) to individual switches 33 mounted on the outside face of the body. as shown in. Fig. 1; the space between the walls 1 and 3 giving plenty of room to make the-necessaryconneetions'without the switch box projecting outwardly of the body to any extent.

top and has a wick 34 or the like projecting slightly from its u per" end and extendin downwardly to the arings of the shaft.

removable plug or scrdw 35 is mounted in the top of the cap directly above the shaft so that on removing this plug oil may be delivered to the wick when necessaryyithout removing any other part.

In operatidn it will be seen that when the elements are heated the rotation of the fan causes air to -be-drawnup from below the body past the elements and then into the room horizontally between the top of the bodyand the disc '19 in the form of a relatively narrow layer which extends unbrokenly about the heater and provides a very efiicient heating of the air in the room. The disc and cap arrangement I p eventing the cap from being overheated to provide'a dead air space an extent which would be'harmful to anyone happening to touch it. The space between the walls 1 and 3 also forms aheat insulating jacket about the heating element, likew se reventing the exterior wall of the body from becoming overheated. Said space also serves as a storage space durin shipment for the extension cord 36 provitfed'with the device for attachment to an ordinary light socket or outlet, and which isof course connected to the leads from the elements, motor and switches.

If desired, a guard in the form of a horizontally disposed band 37, extending closely about the studs 21a and set in notches N cut in said studs, as shown in Fig. 5,may be employed instead of the guard 25.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred constructionof the device. still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus describedmy invention what I claim as new and useful and desire to secure by Letters Patent is:

1. .An electric heater including a body having a pair of circular walls concentric with and spaced from each other, legs supporting the body from the floor in clearance relation thereto, an electric motor mounted in the inner wall area, electric heating elements mounted in the space between said walls, said space beingfreely open to the atmosphere both at top and bottom of the body, and a centrifugal fan mounted on the motor shaft above the body and overhanging the space between said walls.

2 A device as in claim 1, with a solid disc disposed immediately above the fan and rigidly supported from the body outwardly of The motor shaft is hollow and open to the th e fan. p 3. An electric heater including a body having a pair of circular walls concentric with and spaced from each other, an electric heating element in horizontal coil form disposed in and extending about the space between said 'walls, circumferentially spaced insulation plates radial'with the body through, which said coil projects, and means formed with the body for removably supporting said plates.

4. An electric heater including a body hav walls, circumferentially spaced insulation.

plates radial with the body through which said coil projects, and radial ribs between the walls under the coil and on which said plates rest. i

5. A structure as in claim 4, in which-the adjacent faces of the walls from the ribs to the top of said walls are grooved to removably receive the side edges of the plates.

6. In an electric heating device having a body, .an electric heating element mounted therein and open to the atmosphere, an electric motor set on a vertical axis and mounted in the body, a fan on the shaft of the motor I above the body, and a solid cap over the fan and motor; the shaft being hollowand open to its upper end, and the cap havin a normally plugged orifice directly above t e shaft to enable a lubricant to be introduced thereto.

7. In an electric heating device having a body, an electric heating element mounted therein and open to the atmosphere, a centrifugal fan mounted above the body, a solid disc disposed above the fan and supported from the bed said disc extending beyond the plane the outer edges of the fan blades, and a forami'nous guard band extending continuously about the body outwardly. of the fan and disposed between the disc and top of the body in close engagement therewith; the body having a-groove in its upper surface to removably receive the lower edge of the band. I y 8. An electric heating device comprising a body having a pair of spaced and concentric walls providing a space freely open to the atmosphere at top and bottom, said body having a flat surface on top projecting outwardly from the outer wall, a heating element disposed in said space, a solid disc over and spaced from the body and extending \to the plane of the outer edge of said top surface of Q the body, and a centrifu 1 fan disposed in g the space between the b0 y and disc and terminating adjacent the outer one of said pair of body walls. g

In testimony whereof I afiix my signature. HUGH G. LANDIS.

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