588 



THE INDIA RUBBER WORLD 



[July 1, 1917. 



steel clamps being provided for liolding the two sections to- 

 gether. The part remaining to complete the mold is a solid 

 metal funnel core provided with an air valve for inflating the 

 water bottle during vulcanization. 



In making bottles the blanks are cut from the s-hceted stock 

 and placed in the mold as usual. The clamps are sprung over 

 the edges, holding the mold sections firmly together. Molds by 

 the thousands may be then hung in a heater, inflated and cured 

 in open steam. 



Should this method prove successful in the manufacture of 

 certain rubber goods the e.xpense of mold equipment and factory 

 costs would thereby be greatly reduced. [Schoder & Lombard 

 Stamp & Die Co., Inc., 251-253 Canal street, Xcw York City.] 



THE LANGER TIRE FABRIC AND LOOM. 



Inventive effort to eliminate friction between the plies ot fabric 

 used in ordinary pneumatic tire construction is now being direct- 

 ed toward reducing the number of fabric plies in the carcass; 



moreover, it has been found im- 

 practical to wind heavy fabric on a 

 core: 



A specially woven fabric that 

 may be used in one or two ply fab- 

 ric construction, and the loom on 

 which it is made, are shown in the 

 accompanying illustrations. The 

 fabric is woven in continuous tubu- 

 lar forms, each possessing the cor- 

 rect shape and diametrical measure- 

 ment of the intended tire carcass. 

 These sections are cut off, impreg- 

 nated or frictioned with the rubber 

 and made up on a collapsible core 

 in the usual way. 

 The loom is of regular construction with the exception of 

 the fan-shaped reed which is automatically raised and lowered 

 during the weaving operation. When the wide part of the reed 

 beats in the weft the fabric is correspondingly wide and when the 



narrow part is in position to beat in the ^^eft the product is 

 narrow, thus forming the corrugated contour of the tubular fab- 

 ric. [Henry Langer, Middletown, Connecticut.] 



THE MERCURY TRACTOR. 



It is now quite common in a modern rubber mill to see elec- 

 trically-driven industrial trucks and trailers carrying iron molds 

 and cores, raw materials, finished and partly finished products 

 from one department to another with ease and rapidity'. The 

 industrial haulage problem has, of recent years, become more 

 important as factory additions are being made and floor space 

 multiplied. The surrounding conditions and requirements vary 



greatly in different mills, so that a type of power unit that will 

 give satisfactory service under a variety of conditions is desir- 

 able. 



The three-wheel tractor here illustrated has a small turning 

 radius and is generally adaptable to rubber mill requirements. 

 The power is obtained from storage batteries that are compactly 

 grouped within the covered body of the car. The heavy duty 

 motor is mounted directly on the axle and a mercury type con- 

 troller with automatic safety return is provided. Three speeds 

 are available, one forward and two reverse. No resistance is 

 used. The steering lever is directly connected to the front 



wheel, which is only permitted to turn in the angle of the mini- 

 mum turning radius of the car. The foot pedal is connected to 

 the brake wheels on the rear axle for ordinary service. Mercury 

 safety and emergency brakes are attached to the driving shaft. 

 This brake is set at all times excepting when the driver is seated, 

 and instantly stops the car when he arises from the seat. In 

 the illustration the tractor is shown hauling a trailer loaded 

 with iron tire cores. [Mercury Manufacturing Co., 4118 S. Hal- 

 stead street, Chicago, Illinois.] 



MACHINERY PATENTS. 



THE BANBURY AUTOMATIC ENCLOSED MIXER. 



A MIXING machine of the enclosed type for automatically mix- 

 ing and dumping the charge of massed rubber is here de- 

 scribed. A front elevation and a vertical sectional view are shown 



in the illustration, in 

 which A and B are cyl- 

 inders that open into 

 the chamber C. The 

 two rotors D and E are 

 provided with blades 

 w'hose peripheral edges 

 are adjacent to the 

 walls of the cylinders. 

 Supported by. the hous- 

 ing F is the cylinder 

 G in which operates a 

 piston head connected by means of a rod to the weight H, that 

 reciprocates in the chamber C. 



The upper face of the discharging door / forms part of the 

 mixing chambers and is hinged on the shaft J and provided with 

 a counterweight. The door is locked in place by two rollers 

 mounted on yokes fixed to the shaft K that engage the door lugs. 

 The cylinders, bottom door and mixing blades are hollow so 

 that they may be water-cooled. In mixing rubber materials a 

 certain number of revolutions is required and as this varies with 



