Jt m 1. 1915. 



THE INDIA RUBBER WORLD 



491 



more firmly against the core, [hese rollers are mounted upon 

 a Corked lever and can be adjusted as the diameter of the casing 

 increases, so that the same pressure is exerted upon the casing 



at all times. The rollers are placed obliquely, and one of them 

 is located slightK in the rear of the other, the track of which 



it overlaps, so that the entire upper surface of the casing is 

 subjected to the pressure of these rollers For regulating the 

 tension upon the fabric strip a friction bearing box is em- 

 ployed, which may be set to any desired degree of tension bj 

 means oi set ew - 



\ttcr a sufficient number of layers of the fabric (usuall) two) 

 have been wound on the core, the customan beads are applied 

 [f endless bead rings are used they are placed upon the periph- 

 eries oi forms which are pressed against the partly formed 

 casing. If a continuous head stock is used the head rollers 

 are moved close up against the casing and guide the head stock 



in place. When the head is complete the stock is cut at the 

 proper point so that the end will abul against the initial end 

 .it the head. 



After the beads have been attached, further layers of fabric 

 are wound on ihe casing until sufficient thickness of fabric has 

 been applied. To perfect the form of the casing at and around 

 the heads forming rolls are employed. A padding layer of 

 rubber stock is then rolled over the layers of fabric by the presser 

 rolls, and a tread strip is applied. The casing is then finished 

 .ml read) tor curing. [T. J. Whalen, United States patent, No. 

 1.131,760 



KONSKID TREAD MOLD. 



This device consists of the ordinary core and a two-part 

 mold that forms the sides of the tire casing. The non-skid 

 tread is formed by ring segments that are held between the up- 

 per and lower molds and are pressed against the rubber by 

 holts earned in a thrust ring. 



Referring to the drawings below. ./ is the core and />' B the 

 upper and lower mold parts. The tread forming ring C is 

 composed of segments and has ribs / that align with the 

 grooves D oi the mold parts B B. Referring to the upper draw- 

 ing, the tread forming segments are adjustably attached at 

 their centers to the ring F by spring holts (,'. The annular 

 thrust ring I ;s drilled and tapped to accommodate the holts H, 

 which hear on the ends of each tread forming segment. The 

 es formed in the ends of the segments are tilled by the 

 T-pieces /. which prevent the rubber from sluing The core 

 with the tire casing is placed in the lower half of the mold and 

 the upper halt is placed upon it with the tread segments be- 



tween them. These are advanced by the bolts, compressing the 

 rubber and forming the non-skid tread. The mold parts are 

 then clamped together, which registers the tread sections. 

 [Thomas Sloper. British patent, Xo. 2.498.] 



TIRE BEAD FORMING AND COVERING APPARATUS, 

 The Complete apparatus consists of a tubing machine 



extruding a bead core of desired section, and an endless belt 



conveying it from the tubing machine to the covering 



mechanism, which is shown in the illustration. Th( " I 

 is conveyed from the tubing machine by the endless belt, which 

 passes around the pulley B. It is then delivered to the Covering 

 machine supported bj guide roller ( and advance guide D. 

 The strip of frictioned fabric /: passes over guide rollers and 

 underneath the ere. which is pressed against it by the rolh 

 \s the core and fabric pass between the presser rollers G and 

 the forming rollers //, the bead is formed and the fabric folded 

 over it L> the guides / and /. [John R. Gammeter, assignor to 

 The I'.. F. <i Inch to, United States patent. Xo. 1.137.127.] 



BEAD ADJUSTING DEVICE. 

 In making a clincher tire it is very important that the beads 

 should he located exactly in the right position. litis is accom- 

 plished bj Thropp's invention after the following method: The 

 tire casing A' is laid on the core A in 

 the usual manner. The bead is then 

 placed in position on the shallow curved 

 recess D on the bead adjusting ring E. 

 The latter may then he moved laterally 

 into position with respect to the core 

 and the ring itself adjusted accurately 

 in position by the entrance of the shoul- 

 der G within the inner wall of the core. 

 \\ hen pressed laterally against the cas- 

 ing, the base of the bead will be brought 

 into contact with it. causing the bead to adhere to the tire casing. 

 which is formed of nnv ulcanized rubber. The bead adjusting 

 ring may then be removed, leaving the bead in its proper po- 

 sition with respect to the core and the tire casing. [J. E. 

 Thropp, United States patent. Xo, 1.131.173.] 



OTHER DEVICES 



Mm. ii for Non-Skid Pneumatic Tires. — This mold forms thi 

 non-skid tread and provides for the complete curing of thi 

 within the mold in a single operation. The casing, built up on 

 the core, as usual, 'is placed in the mold, which is then closed 

 The tread mold - made up of four sections- i- forced by a 

 rotating ring against the rubber, forming the non-skid tread 

 The mold is then placed in a heater under pressure, and the 

 tire, when cured, is removed from the mold by rotating the 

 ring in the opposite direction. [ \. \V. Finlayson, United States 

 nt, Xo. 1.132.250.] 



\ Fabrk Tension Device. — Two pressure rolls that revi 

 in bearings supported by two side frames are placed one . 

 the other, and are adjustable vertically. Directly opposite the--' 

 rollers is an idler roller journaled in the side frames. The 

 fabric is passed around the lower roll and up between the pressure 

 rolls, and then around the idler roller and back again between 

 the pressure rolls. When the rolls are brought together friction 

 is established between the fabric moving in one direction and 



