US1309845A - Electric vulcanizer - Google Patents

Description

o. C. D`ENN|S. ELECTRIC VULCANIZER.

APPLlCATlON FILED NOV. 26, 1915.

Patented July 15, 1919.

OLIVER C. DENNIS, OF CHICAGO, ILLINCIS.

ELECTRIC VULCANIZER.

Specification of Letters Patent.

Patented July 15, 1919.

Application led November 26, 1915. Serial No. 63,405.

To all whom t may concern:

Be it known that I, OLIVER C. DENNIS, a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Electric Vulcanizers, of which the following is a full, C

clear, and exact description.

The invention relates to electric vulcanizers of the type set forth in Letters Patent No. 1,147,847, granted to me July 2.7, 1915, and its object is to improve and simplify the construction therein set forth.

In the device set forth in said patent. the electric circuit includes a contact between a manually shiftable switch-member and a ratchet wheel which is controlled by the fusible resoldering connection. If an imperfect contact was made between the springcontact and the ratchet, the free flow of current through the resistance element would be prevented, and direct heating of the ratchet and melting of the solder would result before the resistance element reached the desired ltemperature for vulcanizing. To overcome this inaccuracy, the presentin* vention designs to provide an improved electric vulcanizer in which there is a cut-out for the circuit when the vulcanizing temperature is reached, controlled by a fusible connection, and in which the circuit for the resistance element is maintained without depending upon the engagement of the contact and ratchet.

A further object of the invention is to provide a structure in which the case is not utilized as an electrical conductor and in which provision is made for preventing the current from being short-circuited between the exposed binding-posts, such as would occur if the vulcanlzer were placed where both of the binding-posts for the flexible conductors would rest against or touch a conductin wall or support.

Other o jects of the invention'will be aparent from the detailed description of the invention.

The invention consists in the several novel features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings: Figure 1 is an inverted.

plan of a vulcanizer embodying the invention, the bottom plate being removed. Fig. 2 is a section on line 2-2 of Fig. 1. Fig.

3 is a section taken on line 3-3 of Fig. l. Fig. 4 is a section taken on line 4-4 of Fig. 1. Fig. 5 is a detailof one of the split sleeve contacts forming a part of the detachable terminal lfor one ofthe flexible conductors.

The improved vulcanizing device coin-I slots therein to receive clamping-screws or devices whereby a suitable plate may be secured to hold a tire-tube or work to be vulcanized in contact'- with the bottom-plate 12 o f the case or for-connection of suitable devices for holding the curved top-portion 14 of the vulcanizer -in contact with a'tire-casing, as well understood in the art. "A chamber 15 is formedin the body of the casing and this chamber contains a resistance element 16, a controlling switch and the automatically resoldering connection which controls the opening of the switch when the work has been vulcanized.

Plate 12 is secured by screws 17 to close the bottom of the chamber 15 and to form the bottom of the casing. The resistance-element 16 is in the form of a coil of flat wire wrapped around a core consisting of a strip of asbestos 19 held between a pair of strips 18 of insulating material, such as mica. Strips of similar' insulating material 20 are laid between the resistance wire and the top of the casing and a strip of similar insulating material 21 and asbestos 22 are interposed between the resistance element and the bottom-plate 12. These insulating materials 'prevent current from passing from the resistance element to the case and the asbestos serves to distribute the heat over sufficient larea to roperly heat the work. One end of the resistance element 16 is connected to a binding-post 24, which is in the form of a screw 25 and is clamped to the casing by a nut 26 and insulated therefrom by washers 27. The other end. of the resistance element is extended between a pair of plates 28, 29 between which it is clamped by screws 30 which secure the plates in the case and are insulated from the plates by washers 31 and insulating plates 32 and 33. The outer ends of plates 28 and 29 are divergent, as at 34, to receive and frictionally and rmly engage anl inturned lug 35 on a resilient switch-member 36. One end of 29 and close the circuit at this switch.

switch-member 36 is secured to a bindingpost 37, similar in construction to the binding-post 24 and insulated also in similar manner from the case.

The binding-posts are adapted for connection to fiexible conductor- wires 38 and 39 which are connected to a battery or source of potential, and each of these wires is provided with a terminal comprising a socket 40 of insulating material and a split contactsleeve 41 secured in the socket by a screw 42. The head 43 of screw 42 is countersunk and covered with insulating material 44. The split-sleeve 41 is adapted to frictionally engage and to be pushed into firm contact with the tapered end of the screw 25 of the binding-post. Socket 40 is adapted to pass over the lock-nut 26 of the binding-post, so that when the vulcanizer is connected to a battery, the exposed portions of the binding posts will be covered and protected against contact with any conducting material, whereby a short circuit might be established between the two binding posts and the vnlcanizer. This feature of effectively guarding against any short-circuiting is important, because in a vulcanizer with an automatic cut-out, it is customary to leave the vulcanizer unattended during the vulcanizing operation, the cut-out being depended upon to open the circuit when the vulcanizing operation has been completed. Obviously, anyv short circuit between the two binding posts would prevent the current from flowing to the resistance element when the switch is closed.

The automatic fusible resoldering connection comprises a ratchet wheel 45 held on a stud 46 which is screwed into a plate 47, which is secured in the case by screws 30, which clamp it between the contact-plate 28 and insulating material 32. Plate 47 is insulated from said screws by sleeves 31a. A sleeve 48 is interposed between the ratchet 45 and plate 47 and the ratchet is held on stud 46 by the head 462i of said stud. A film of solder 49 is interposed between ratchet 45 and head 46a and this solder is fusible atvulcanizing temperature. A retaining member 50 is secured to the movable end of switch-member 36 and is provided with a slot 51 to receive the teeth of ratchet 45 and a push-button 52 of insulating material is secured to the same end of spring-contact 36 and extends through a hole in one side of the case, so that it can be manipulated from the outside thereof.

lVlien the button 52 is pressed inwardly, the retaining member 50 will engage the ratchet wheel and will be held thereby. At the same time, lug 35 on switch-member 36 will pass between the contact-membersC 28,

rent will then fiow over a circuit as follows:

conductor 38, screw 42 and split-sleeve 41, to which the terminal of said conductor is connected, screw 25 of'binding-post 24, resistance element 16, contact plates 28, 29, contact-lug 35, switch-member 36, binding-post 37 and conductor 39. This circuit will remain closed until the resistance element has produced sufficient heat to bring the case to the highest temperature desired in vulcanizing, usually from 250 to 285O Fahr. At that time, the solder 49 will fuse so that the inherent resiliency of switch-member 36 will pull the retaining member 50 outwardly and cause it to slip off of the tooth of the ratchet whereby it has been held. Thus, the vulcanizer will automatically open the circuit when the polymerization point has been reached, so that the work will not be over heated and will be properly vulcanized.

It will be observed that the circuit is.

closed at lug 35 on the switch-member 36 and the contact- plates 28 and 29, which are securely clamped to one terminal of the resistance element, so that a circuit will be established which does not depend upon any point contact between the retaining member 50 and the ratchet 45 and that the lug 35 and contact- plates 28 and 29 operate as a knife-switch for obtaining effective connection for the flow of current to the resistance element.

It will also be observed that the circuit is insulated from the case and that provision was made for connecting the detachable conductor terminals from the battery to the binding-posts, which avoid the possibility of any short circuiting between the bindingposts.

The device is simple in construction and can be produced at a low cost.

The invention is not to be understood as restricted to the details set forth, since these may be modified within the scope of the appended claims, without vdeparting from the spirit and scope of the invention.

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

1. In a. portable electric vulcanizer, the combination of a case, an electrical resistance element in the case, a switch for controlling the fiow of current through said element comprising a resilient member within the case and having one of its ends fixed to and insulated from the case and another member fixed to and insulated from the case and connected to said element, a button fixed to the movable end of the resilient member and extended to the outside of the case, and an automatic cut-out for releasing the resilient member when the vulcanizing temperature is reached.

2. In a portable electric vulcanizer, the combination of a case, an electric resistance 'element in tlie case, :L switch for controlling a button extended to the outside of the case the flow of current through said element for operating the resilient member, and un comprising u resilient member Within the' 4automatic cut-out for releasing the resilient 10 case and having one of its ends fixed to and member when the vulcanizing temperature insulated from the case and another member is reached.

consisting of a pair of plates between which one end of the resistance element is clamped, OLIVER C. DENNIS.

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