August 1, 1917.] 



THE INDIA RUBBER WORLD 



653 



POWERS' TEMPERATURE REGULATORS. 



The control of temperature is a vital necessity in the manu- 

 facture of dependable rubber goods. The maintenance of the 

 required degree of heat during the period of vulcanization de- 

 termines the ef- 

 fectiveness of the 

 cure and depends 

 in a great meas- 

 ure on the auto- 

 matic devices used 

 for controlling vul- 

 va n i z i n g tempera- 

 tures. Also in steam 

 heated dry rooms for 

 drying crude rubber, 

 c o m p o u n di n g in- 

 gredients, and var- 

 nished rubber goods, 

 temperature regula- 

 tions are indispen- 

 sable. 



A type of temperature control that is recommended for these 

 purposes is here shown. The thermostat, or sensitive bulb, is 

 arranged in the heated space and transmits the changing vapor 

 pressures thrgugh a flexible armored tube to a metallic dia- 

 phragm located in the bonnet of the steam valve. The expan- 

 sion and contraction of the bellows opens or closes the valve, 

 thereby regulating the supply of steam to the heater or dry 

 room. Adjustment for different 

 temperatures is accomplished by 

 changing the position of the weight 

 that slides on the valve lever. In 

 vulcanizer and dry room installations, 

 where temperatures above 120 de- 

 grees F. are used, the thermostat is, 

 of course, located within the heated 

 space while the valve is arranged on 

 the outside. In varnish drying 1 



rooms where a tempera- __2 ^_^ 



ture of 120 degrees F. e — ^t-i 



or less is to be maintained, the valve is located within the room. 

 Where it is necessary for any purpose to maintain a certain 

 degree of humidity, the regulator shown in the lower illustration 

 and designed for the control of liquid temperatures, is used. The 

 thermostat in this case, however, is immersed in the heated water 

 tank and transmits the changes in pressure to the metallic dia- 

 phragm that opens and closes the steam valve, thereby regulating 

 the water temperature. [The Powers Regulator Co., 5 South 

 Wabash avenue, Chicago, Illinois.] 



MACHINERY PATENTS. 



GAMMETEB'S VULCANIZING PRESS. 



I 'HE prime object of this invention is to provide a mechanically 

 ■*■ operated elevator whereby the loading and unloading of molds 

 used in the manufacture of mechanical rubber goods is greatly 

 facilitated. The illustration, representing a side elevation of 

 the machine partly in section, comprises the hydraulic cylinder 

 A forming the base in which operates a ram that supports the 

 movable platen B on its upper end. Seven hot plates are pro- 

 vided, the lower one shown at C resting on the lower platen 

 while the uppermost plate D is attached to the upper platen. 

 The intermediate plates have varying degrees of vertical move- 

 ment and are provided with means for stopping the plates at 

 predetermined distances from each other to permit the inser- 

 tion and withdrawal of the molds. All the hot plates are cham- 

 bered for steam and connected to the supply line by flexible . 

 joints. On opposite sides of the press are two elevator plat- 

 forms, E and F, suspended by four vertical rods from the yoke 



G that is fixed to the ram H, which reciprocates in the cylinder 



/ mounted on 

 the head of the 

 press. 



The press is 

 opened by dis- 

 charging the 

 lower cylinder 

 and the ram 

 descends, thus 

 opening the 

 mold compart- 

 ment. The press 

 is then charged 

 with the full 

 complement of 

 molds and 

 pressure ap- 

 plied during 

 the vulcanizing 

 period. When 

 the molds are 

 to be changed 



this may he effected with tlie aid of the elevators and by 

 the operator on one side pushing an uncured mold into the com- 

 partment, thereby forcing out a cured mold onto the opposite 

 platform. The molds may also be cured in pairs with over- 

 lapping curing periods, only two of the molds being changed 

 at one time and the others remaining in the opened press, the 

 substitution of the molds being greatly facilitated, meanwhile, by 

 the movable platforms. [John R. Gammeter, Akron, Ohio, as- 

 signor of The B. F. Goodrich Co., a corporation of New York. 

 United States patent No. 1,232,022.] 



A SELF-CONTAINED TIRE VULCANIZING MOLD. 



Tliis novel mold is adapted to be used for building up the car- 

 cass of pneumatic tires and vulcanizing them without removal 

 from the mold until the time has elapsed to effect the cure. 



In the illus- 

 tration, which 

 shows a verti- 

 cal section and 

 an approximate 

 section taken 

 on the line A, 

 B. C is the 

 mold that is 

 bolted to any 

 convenient sup- 

 port and pro- 

 vided with heat- 

 ing chambers, 

 D is the sec- 

 tional core and 

 E the core expanding device comprising four adjusting screws. 



In practical operation the various plies of frictioned fabric 

 constituting the carcass are successively placed within the mold 

 and shaped by hand and the heads applied. When this operation 

 is finished the three straight sections of the core are mounted in 

 place and finally the top or wedge-shaped section is introduced. 

 The four .screws of the expander being retracted, it is then lo- 

 cated within the core, the heads of the screws alining with the 

 channel grooves, and when the screws are expanded the core 

 forces the casing against the walls of the mold. Any suitable 

 means may be employed in curing, but in this instance electric 

 heaters are introduced into chambers provided in the base of 

 the mold for that purpose. [Fred Brown Pfeiffer, .\kron, Ohio. 

 United States patent No. 71,231,645.] 



