38 



Hardwood Record — Veneer & Panel Section 



April 25, 1921 



Belts and Transmission 

 Kinks 



By R. C. L., a Mechanic 



Belts! This being the subject in hand, the writer will endeavor 

 to very clearly set forth the advantages and disadvantages of the 

 many different ways and means of making fast the ends of same 

 as applied to modern belt lacing methods when raw-hide lacings 

 are used. 



It is not a case of the strength of the fastener which gives 

 best satisfaction in all manner of belting "new or well worn" 

 but a case of securing the fastener (metal or raw-hide) that 

 will hold the ends of belting best and longest. Belt ends or the 

 holes in them made for lacing or fasteners — pulling out under 

 the strain is the belt man's worst enemy and not the actual 

 breaking of the fastener or wearing, but mostly a case of holding 

 the ends and keeping holes intact. 



Now that this is made plain and taken from long experience 

 with belt transmission, let the subject of best methods of lacing 

 designs be covered. In this capacity, there are many designs 

 for raw-hide use. The many styles seen in use are shown in 

 sketches herewith. There are styles which require a great deal 

 of work and lacing to insert with little added strength and others 

 which have real merit as observed and practiced by the writer 

 in past years. There are the "straight lace, that is, the strands are 

 on the same side of belt ends — which are suited for large pulleys 

 only and there are the "Hinge-lace" styles which suit for high 

 speed pulleys of small diameter, both of which will be shown 

 up fully in real operation conditions. 



To run down the line of the sketches, Fig. 1 , shows stamp 

 sketch of a lattice lacing recommended for a large driving belt 

 1 2 inches and up in width and especially such a belt as is well 

 worn and thin — because of the strands reaching well back from 

 the belt ends and becoming interlocked again, the strain is taken 

 off the extreme belt end holes which are likely to pull out owing 

 to the great strain of a large belt on same. This is a straight 

 lace style and not for small high-speed pulleys but of large 

 diameter. To more fully understand this greatest of all mechanical 

 details in explaining, the straight lines of lacing or more so than 

 the other crossed lacing — denotes the under-side of belting or 

 the side to run next to the pulley. 



(A) sketch being the underside or pulley side. (B) sketch is 

 top side. Fig. 2, shows the two views of another form of lattice 

 lacing style as is often used on small slow turning pulleys and 

 where great strength is needed with a heavy belt to its width. 

 (C), underside, (D), top side. 



Fig. 3, shows a box lacing which differs little on both sides 

 of belt. This is used to good advantage on feed belts of machines. 

 Same is well reinforced and nothing but a breakage of half the 

 strands will release the belt. 



(E), underside, (F) top. Fig. 4, shows a well interwoven 

 lace style which the writer first saw outlined in a machinery 

 catalog and put same to hard tests on feed belts of small size and 

 it outlasted any other of its nature. The joint becomes prac- 

 tically as strong as the belt itself. (G) is underside, (H), top 

 side. Fig. 5, shows what has been termed the bridge lacing 

 style. This is recommended for large belts of great width and 

 becomes locking to its strands insuring nothing but a breaking 

 to pull same apart. 



(I) underside, (J), top. Fig. 6, shows satisfactory style for 

 canvas belting of large size and pulleys. Same holds belt ends 

 well in line and has back reaching strands to re-inforce the end 

 holes which is best in canvas. 



(K), underside, (L), top. Fig. 7, shows another well braced 

 tContinucd ott pnfjf .i..') 



i£LTS:' 





m f ffi 



/yd. /O. 





.ffoji: 



