342 



THE INDIA RUBBER WORLD 



February 1, 1921 



drive wheels drop into holes in the floor or yard. The motor is 

 especially designed to require the minimum amount of power to 

 drive or lift wliichever the case may be. The tractor frame is so 

 constructed that there is a wide clearance under the truck. The 

 reduction gear or lift motor is well out of the way of any dirt or 

 water. Solid rubber tires are used. — Elwell-Parker Electric Co., 

 Cleveland, Ohio. 



PLANTATION BARK AND SCRAP RUBBER WASHER 



This machine is designed to quickly and thoroughly wash plan- 

 tation rubber scrap and bark, removing all traces of dirt and 

 sand, preserving the nerve and strength of the rubber. It consists 



Continuous Pl.\ntation Scrap Washer 



of a main roller specially grooved, revolving in a heavy cast iron 

 casing, accurately bored, and heavily ribbed with a secondary 

 roller, used as a feed roller. The rollers are raised at such an 

 angle that the delivery end is higher than the feed end. 



The rubber scrap is fed into the machine and passes round 

 between the main roller and the casing, while at the same time 

 it is moved along the surface toward the discharge and where it 

 is delivered in a clean, macerated and amalgamated condition. 

 The average length of the pieces is one inch in diameter by four 

 inches long, ready for passing through the sheeting machines. 



The best materials and workmanship are employed in the con- 

 struction of the machine, which is simple throiii»hout. .-Ml mu\ - 

 ing parts are enclosed. It is designed for a direct drive through a 

 friction clutch, from a main shaft, or fitted with tight and loose 

 pulleys for belt drive. From 10 to 12 h.p. is required to operate 

 it. There is no possibility of oil running on to the rollers or sand 

 and dirt getting into the bearings. The stated capacity of the 

 washer per hour is 350 pounds of wet bark and scrap rubber. — 

 The Planters lingineering Co., Limited. 28 Martins Lane, London, 

 England. 



MACHINERY PATENTS 



MACHINE FOR FORMING BATTERY JARS 



THE PURPOSE of this invention is to provide a machine that 

 will eliminate most of the hand labor necessary in forming 

 battery jars and to also provide a means for heating the mold. 

 The operation of the machine shown in Fig. 1, is as follows: 

 The mold is placed in position on the hot plate. Air under 

 pressure is admitted to the piston A, causing it to move upward, 

 carrying the plunger to the top of the mold. At the same time, 

 plunger B forming the cover of the mold is raised to its full 

 extent. This allows a mandrel to be inserted between the 

 plungers and placed within the cup C. The mandrel is rounded 

 at the corners, while the cup C is square at the corners. The 

 space between the corners of the mandrel and the cup C is 

 designed to receive the surplus rubber which will flow thereinto 

 by pressure. The rubber compound comes in square blocks of 

 the same cubic area that will be required to form the complete 

 jar. The rubber blrick is placed at the mouth of the mold and, 

 as it is heated, becomes fluent and flows around the mandrel. 



The overflow spaces which receive the surplus rubber are located 

 at the lower end of the mold. There is no opening at the top 

 of the mold when the plunger li is in a compressing position, 

 consequently the jar is completely formed before any surplus 

 rubber escapes into the overflow spaces. The surplus rubber 

 ordinarily remains on the bottom corners of the mandrel and can 

 be broken off immediately, or ground oil after the jar is vul- 

 canized. 



After the mandrel is in position, the mold sections are locked 

 by operating a handle D. The uncurcd rubber is placed within 

 mold on top of the mandrel and steam or compressed air is 

 admitted into cylinder E which depresses the plunger B. This in 

 turn ccmipresses the rublier until all the space between the 

 mandrel and the mold is filled. Within a suitable length, of 

 time, steam or air is exhausted from the cylinder E and the 

 plunger B returns to its raised position. Handle D is then 

 turned to unlock the sections of the mold, which spread by reason 

 of a spring and thus freeing the mold sections from the jar. 

 Piston A is next operated, and plunger F moves upward, carry- 

 ing the cup with the uncured rubber jar out of the mold. The 

 jar with the mandrel inside is removed from the cup and cured. — 

 John H. Ten Brink and Alvin V. Martin. Muskegon, Michigan. 

 L'nited States patent No. 1,363.695. 



LOOM ELEMENT FOR MAKING CORD FABRIC 



This invention relates to an improvement in the method of 

 making cord fabrics for tires, where it is desirable to lay the 

 fabric over a core and evenly extend it in all directions. The 

 weft threads are omitted and a selvage element is provided 

 which prevents the fabric stretcliing prior to rubberizing or 

 calendering, also increasing the inherent stability. The warp 

 thread is distinct from the selvage element, which may be 

 removed from the fabric after it is rubberized or calendered. 

 It may be cut from any part of the work when desired. 



The loom element shown in Fig. 2 is provided with a heavy 

 Imse with an upright frame supported by a standard. The thread 

 from the bobbins A are led upward to a central tube which is in 

 ;ui upright position and connects to the upper end of .-i tubular 



shaft. The thread passes downw.ird through the tubular shaft 

 and emerges at the lower end through a head B, bored to accom- 

 modate the thread. From here the threads are carried outward 

 and passed through curved guides or eyes C, then brought into 

 contact with the warp thread. 



The warp thread is supplied by bobbin D. The tubular thread 

 guides or eyes are mounted on a rotatable sleeve also connected 

 to head B. The warp thread is continuously looped around the 

 selvage element. In order to retain the selvage threads in their 

 proper space relation during the process of looping and to guide 

 the fabric toward the take-off, means E, space guides are pro- 

 vided. These guides so direct the course of the fabric as to 

 produce a transverse distortion or the bias relation between the 

 warp tliread and the selvage thread. The guides consist of a 



