US1726658A - Heating device - Google Patents

Description

sept. 3, 1929. l

O. J. FAY ET ALA HEATING DEyICE Filed Dec, 23, 1927 Patented v Sept. 3, 1929.

UNITED STATES PATENT OFFICE.

OWEN JAMES FAY, F CHICAGO, HARRY T EMERSON PUGH, OF CHICAGO, ILLINOIS OBIAS HEIMBERGER, 0F RIVERSIDE, AND ASSIGNORS T0 WESTERN ELECTRIC COM- IEANY,v INCORPORATED, OF NEW YORK, N. Y., .A CORPORATION OF NEW YORK.

HEATING DEVICE.

Application led December 23, 1927. Serial No. 242,046.

This invention relates to a heating device,

and more particularly to an electrically heated soldering iron.

The object of this invention is to provide an improved heating device of simple and practical construction which permits of a quick and easy assembly or convenient replacement of parts thereof. y

A preferred embodiment of the invention consists of an electrically heated soldering iron, wherein a unitary replaceable double helix heating element insulated from and surrounding a solid heat conducting core has reinforced wire terminals passing through slots in a cap and through separated longitudinal passageways in a stem insulator. The ends of the heating element are attached to connectors on opposite sides of an insulating strip which engages a slot in the end of the stem insulator and is fastened in a handle by a slotted sleeve. 'The connectors extend through and terminate in the end of the handle and are engaged by a quickly detachable electrical contact socket which is enclosed by a retaining cap threaded on the end of the handle.

Other objects will appear more clearly from the following one embodiment of the invention, taken in connection with the accompanying drawings, in which Fig. 1 is a longitudinal elevation, partly in section, of a soldering iron, embodying the features of the invention;

Fig. 2 is a sectional view taken on lines 24-2 of Fig. 1;

Fig. 3 is an enlarged cross-sectional view taken on lines 3 3 of Fig. 2;

v Fig. 4 is an enlarged cross-sectional yview taken on lines 4 4 of Fig. 2;

Fig. 5 is an enlarged fragmentary detail View of the resistor winding showing the reinforced wire terminals thereof, and

Fig. 6 isan enlarged fragmentary perspective view disclosing a means for locking the metal shell encasing the heating unit to the stem assembly of the handle.

Referring now to the drawings wherein like reference numerals refer to similar parts throughout the several views, the numeral 10 designates a heating element of any suitable high resistance electrical conducting material formed into a helix with a straight lead 11 on each end. The helically formed redetailed description of sistance wire 10 is wound in a loop over a helically grooved cylinder 1'2 constructed of any suitable refractory insulating material, starting around a protruding post 13 at the forward end of the refractory cylinder 12 as illustrated in Fig. 1. The helices are so spaced that they are out of contact with each other, thus reventing a short circuit which would ren er part of the resistor ilieifective to generate heat. In order to strengthen the leads and to increase their conductivity thereby minimizing the generation of heat in the leadsythree eXtra wires are inserted a short distance inside the helix and are twisted with a lead to form a reinforced stranded terminal. This feature assists in keeping the handle from becoming hot since the reinforced leads having a lowered resistance do not generate any appreciable amount of heat. The leads 11 of the resistor 10 are threaded through apertures 111-14 in protruding portions 15 diametrically opposite each other atthe upper end of the insulating cylinder 12 and then through holes 16 to the interior of the insulating cylinder l2. From the inside of the insulating cylinder 12 the leads 11 are passed through slots 20 into a substantially rectangular shaped depression 25 in an insulating cap 21 and from there through separated longitudinal passageways 22 in an insulating stein of refractory material 23 having a substantially rectangular end 24: which fits into the substantially rectangular depression 25 in `the cap 21 and is thus interlocked with the cap. The other end of the stem insulator 23 is provided with a rectangular slot 30 into which an insulating strip 31 fits carrying a connector bar 32 on either side and having `screws 33-33 by means of which the leads 11 of the resistor 10 are secured thereto. The connectors are crim ed over the edges of the strip 31 and in ad ition are secured by the screws 33 and an insulating band 34, and they extend out of and beyond the end of a woodenhandle 35 so that electrical supply terminals 36 in a socket 37 can lbe engaged with the connectors 32.` The socket terminals may be connected through a cord 38 to a suitable source of electrical energy.

A detachable retaining cap 40, which may be of any suitable metal, ythreaded on the handle 35 is adapted to rigidly maintain the electrical supply socket 37 in contacting pothe clamp 42 las it bears against the washer 41 held in place by the cap 40, thereby pre-- venting the cord from being torn from the terminals 36 in the socket 37.

The lower end of the handle 35 is tfireaded into a metallic collar -45 which in turn is threaded onto a member 46 forcibly driven on a metallic tube 47 surrounding the stem insulator 23. A. flanged sleeve 48 having a slot extending through the flange and longitudinally thereof, fits over the metallic tube 47 and the insulating strip 31 which Ahas a widened portion 39 (Fig. 1) extending through a slot in the tube 47 and the slot in the sleeve 48. The flange ofthe sleeve 48 bears against the end of the handle under the collar 45 and serves to rigidly interlock these members and prevent an accidental withdrawal of the insulatin strip through the opening in the end of t e handle. At the lower end of the metallic tube 47, a thimble 50 is forcibly driven thereon and has a threaded end on which is screwed-a metal shell 51 encasing the heating element 10.and separated therefrom /by a mica cylinder 52. f A thin meta-l washer 53 is placed between the shoulder of the threaded part of the thimble 50 and the metal shell 51 screwed thereon. The washer is adapted to interlock the thimble and shell when the washer is driven into semi-circular slots 54 and 56 in the shell and thimble as shown in Fig. 6 ofthe drawing. The shell 51 also has arthreaded circular opening 55 for receivingE a heat conducting core 57 inserted inside the resistor supporting cylinder 12 and a copper soldering tip 58 which abuts against theend of the core .57. rllhe contact between the core 57 and the soldering tip 58 expedites the conduction of heat from the heating element 10 to the soldering tip.

The soldering iron is compact and comprises relatively few parts, each of which is removable as a unit, so that with the above described construction it is an easy matter to replace any particular part or parts without discarding the entire iron. The ease and quickness with which the unit may be disassembled will be clearly ap arent from the following description: To isassemble the soldering iron, the retainin cap 40 is detached from the handle an the electrical socket 37 removed therefrom. rlhe handle 35 with its collar 45 may be unscrewed from the member 46 ofthe tubular assembly 47 and withdrawn over the insulating strip 31 and connectors 32. This gives access to the screws 33 on the connectors so that the leads 11 can be released from under the screws, thereby permitting the removal of the insulating strip 31, connectors 32 and flanged sleeve 48. The metal shell 51 is yremoved by driving the washer 53 out of the slots 54 and 56 restoring it to its originally flat condition and Aunscrewing the shell from the thimble 51 carrying with it the heat conducting core 57 and soldering tip 58. The heating element 10 with its leads 11, supporting cylinder 12 and insulating cap '21 are pulled away from the stem insulator 23 which may be very easilyl removed from the tube 47. Any part can now be readily replaced and the iron can be expeditiously reassembled ready for use. y

Although the invention as herein described and illustrated is particularly well adapted to an electric soldering iron, it should be understood that the invention is adaptable to other electrically heated devices and should be limited only by the scope of the appended claims. y C

What is claimed is:

1. In an electrical heating device, a heating means, a housing for the heating means' having a slot, an element engagin the housing and provided with a slot, an a member interposed between the housing and the element and engaging the slots therein for interlocking the housing and the element.

2. ln an electrical heating device, a heating element, leads for the element, a support for the heating element, a slotted insulating cap for the support having a depression, and an insulatin stem provided with a passageway for gui ing the leads received from the slots in the cap and having an end adapted to engage the depression in the insulating cap for interlockin the cap and stem. 3. in a heating evice, a double grooved insulatin cylinder, a looped heating element supporte in the groove of the insulating cylinder, leads for the heating element, a slotted insulating cap for guiding the leads from the heating element and having a substantially rectangular shaped depression, a stem of refractory material having a substantially rectangular end adapted to fit into the depression m the cap for interlocking the stem and cap.

4. ln an electrical soldering iron, a heat .l

a heating element, leads for the heating element, a slotted insulating means for guiding the leads into the handle, an insulating strip engaging the slot in the means for guiding the leads, and terminals lfastened to the insulating strip and extending out of the end of the handle adapted to be inserted into anelectrical lsupply socket.

6. In a heating device, a handle, a heating unit insulated from and encasing a part to be heated, leads for the heating element, a

slotted insulating cap for guiding the leadsV from the heating unit, a stem insulator having individual passagewa s for guiding the leads from the cap'into tlie handle, an insulating strip having a widened portion, connectors fastened thereto for engaging the leads of the heating unit and extending out of the end of the handle, a flanged sleeve having a slot engaging the widened ortion of the insulating strip for interlocklng the stem insulator, insulating strip and handle,

- a detachable electrical supply socket for enaging the connector protruding .out of the andle, and a member for substantially covering the socket "and threaded on the end of the handle for maintaining a rigid electrical contact between the supply socket and the connectors.

7.-In an electrical heating device, a handle, a heating element, leads for the heating element, means for guiding vthe leads into the handle,- an insulating strip housed within theha-ndle, slotted means engaging the strip for interlocking the guiding means thereto, a

'detachable supply socket for connecting the leads to a source of electrical energy, and means substantially surrounding the socket for maintaining a connection between .the socket and the handle.

8.,In anfele'ctrical heating device, a handle, a heating element having leads, a housing for the heating element having a slot, a stem for guidin element into the andle, an element encircling the stem and-having a slot, a member interposed between the housing and the encircling element and engaging the slots therein for interlocking the housing and the encircling element, terminals housed within rality of strands extending inside a plurality the leads of the heating ofthe convolutions of the coiled heating element and twisted with a lead of the heating element forincreasin the strength and-conductivity of the lea s, a slotted insulating means for guiding the reinforced leads into the handle, an' insulating strip engaging the' slot in the -means for guiding the leads, and

terminals fastened to the insulating stri and extendinl out of the end of the hand e ,adapted to e inserted into an electrical supplysocket.

In witness whereof, we hereunto subscribeI our names this 7 day of'December A. D., 1927.

.OWEN JAMES FAY.

HARRY TOBIAS HEIMBERGER. EMERSON PUGH.

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