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 .431J (Logging equipment)* 
 
 FOREST PRODUCTS LABORATORY , FOREST SERVICE 
 U. S. DEPARTMENT OF AGRICULTURE 
 
 SMALL SAWMILL IMPROVEMENT 
 
 PRACTICAL POINTERS TO FIELD AGENCIES 
 
 oSTJ-TCATIITG AUTO TRUCK 3S7IC5S 
 
 Self-loading track device:-, are )Owered by installing a power 
 take-off on the true!:, and arc often built locally. One provides for 
 cross-hauling logs of standard lengths and is used with a semi- 
 Ller (fig, l) or a truck. Another employs a boom to load bolts 
 3 tie cuts crosswise of the bed of a truck, or small logs length- 
 wise (fig. 2). 
 
 Cr oss -haul Loading Devic e 
 
 
 *he cross-haul loading device is made by mounting the rear 
 axle of a passenger-car acrors the truck frame back of the cab as 
 shown in figure 1, A. The brake mechanism of the wheel of the de- 
 vice, on the driver's side of the cab, is operated by a lever a. 
 A drum b with a capacity of 60 feet of 3/8-inch preformed cable 
 (drum core diameter 4 inches, drum length 6 inches, and drum end 
 diameter 10 inches) is fastened to the opposite end of the rear 
 axle. '-<-'ho cable extends back from the drum over two sheaves c. 
 
 The driven sprocket is fixed to the stub of the drive shaft 
 of the pasaenger-car rear axle by cutting the shaft, to 3/4-inch 
 diameter and providing a l/8-inch keyway. Ihe driven sprocket lias 
 31 teeth, A roller chain of 1-inch pitch connects- to the drive 
 sprocket a shown in figure 1, 3. The drive sprocket is cast steel, 
 has six teeth, and is fastened by a l/B-inch key to the power take- 
 off drive shaft c, cut to 3/4-inch diameter, ^uo hf nri-\;;r ^ ~'i — 
 port the shaft c, and a cress brace d must be a -dadi ffMl? 
 one bearing. In figure 1, 3, 'a the main drile ■§Mf0 l anc 
 
 r mousing of the truck. 
 
 To operate, the driver throws the power take-ofr*in gear 4// 
 ie of a lever in the cab. The cable is pullc i off the spool as 
 the loader takes the hock end over the middle bu ik of the trailer, 
 over the log and back under it, and fixes the hoflif ./p.Shv.'J^WciOf rlori: 
 fr.v:ic. Thia gives a single-line cross haul, 
 
 U •-W?--O aJ.'L ' MM ' iv uu 
 
 taken in spotting the truck so that the middle bunk of the trailer 
 is about opposite the enter of gravity of the log. Ths driver 
 gets out of che cab and ap liec th brake, thus stO] >in 
 Dr a! el, whereupon the drum revolves and the log rolls up the 
 
 skids . 
 
 R399-24 
 
 -1- 
 
 t Maintained at Madison, Wisconsin in cooperation with the University of Wisconsin 
 
 •S.e outline in Small Sawmill Improvement Working Plan, March 1930, lor explanation o< Indexing s y ? tem proposed 
 
Boom-type Loading Device 
 
 Boom-type equipment is widely used in the Lake Stater, in 
 loading and unloading 100-inch holts, tie cuts, and smaller logs 
 The boom may he either fixed or swinging. 
 
 Fixed Boom 
 
 She less expensive installations have a power take-off and 
 drum mechanism and have a wood frame and boom. The wood is of a 
 high density species, such as oak, ash, or elm. 
 
 Figure 2 shows a fixed-boom loading device installed on a 
 truck but does not show the power take-off mechanism which is 
 similar to that shown in figure 1. In figure 2, two 4-inch oy 
 5-inch uprights a extend 10 feet above the truck frame immediately 
 behind the cab. A 4-inch by 5-inch cross member b is fixed between 
 the uprights approximately 6 feet B inches above the frame. A 4- 
 inch by 4-inch boom c_, long enough to extend approximately half the 
 truck bed length, is clevis-clamped to the midpoint of the cross 
 member b. She union of the cross member and uprights is reinforced 
 with angle iron. The bases of the uprights are clamped to the top 
 of the truck frame and likewise are reinforced b; r angle iron and by 
 a 2-inch by 4-inch brace d, one end being fastened about 2 feet 
 above the base of the upright and the other fastened to the truck 
 frame about 2 feet behind the uprights. Three-fourths-inch cable 
 bracing e is placed as follows: from the outer end of the boom, 
 back to each upright at the juncture of the cross member, from each- 
 end of the cross member diagonally to the bottom of the opposite 
 upright, and from the outer end of the boom over the top of each- 
 upright, over tho cab and hood to the car frame under the radiator. 
 The power cable f ia threaded through sheaves at the base and end 
 of the boom. 
 
 S winging Boom 
 
 In this installation, the boom may pivot from tho boom frame 
 at one definite point, usually half across the truck (details not 
 shown), or may pivot from any of several points acres- the truck 
 (fig. 3) permitting both a greater reach laterally and a more posi- 
 tive pull when the boom is in a lateral position. This arrangement 
 permits easy swinging of the load to or away from' the truck. 
 
 If tie cuts or logs are hauled, a crotch line-end hook com- 
 bination is used; for bundles of bolts, the single cable and hook 
 prevail. To operate, the power take-off mechanism is engaged and 
 tho power take-off gear box lever shifted from neutral to low, with 
 the truck spotted conveniently for loading or unloading. For material 
 
 R8 99-24 -2- 
 
to be loaded crosswise of the *ruck bed , the truck is usually placed 
 parallel to the "bolts; for longer material, the l r ' ; axis of the 
 true',: Led ia parallel to bhe logs, "he cable i' : pulled off ch« -:i tc 
 by • .round -nan. In loading pulpwood, about one-fourth cord to i 
 slin is held by a. single wrap. Wit bie outs or logs, single i '■- " 
 pn ed by end hnok3. !?he ground n mat ipulates the bra 
 
 cables to elevate the load, and suspend it while it swings ov< r 
 truck and i3 released onto the true' 1 : bod. The load is "aided by a 
 second man :o its position on the truck. 
 
 Contrib ited v ;- 
 
 c. j. 'r-- I 
 
 Small-mi] 1 Specialist 
 June 1945 
 
 HUME LIBRARY 
 
 CCT al 1972 
 
 I.FAS. - Univ. of Florida 
 
 ■^c'.a'L acknowledgment is made to '■'. 0, ."ixo :, ■ o ' . , rorest 
 
 vervice, for the do script ioi f bhe fixer 5 boom s .-. . . . 
 
 oues, Eowes Lumber Corporation, La Porto. I .d. , for uetj ; i. - > of 
 tie power cross-haul device. 
 
 19-24 
 
 
A LEGEND •■ 
 
 a- BRAKE LEVER 
 b-DRUM FOR CABLE 
 C- SHEAVES FOR CABLE 
 
 S a- SPROCKET 
 
 b~ BEARINGS FOR POWER TAKE-OFF 5 HAFT 
 
 C- POWER TAKE-OFF SHAFT 
 
 d: SPECIAL METAL CROSS SUPPORT 
 
 e-MAIN DRIVE 5HAFT OF TRUCK 
 
 f -SUPPORT OF MAIN DRIVE SHAFT 
 
 g- GEAR HOUSING 
 
 Z M b326l F 
 
 Figure 1. -Cross-haul loading device mounted on truck frame. 
 

 
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L3G31TD FCH FIGUH3 3 
 
 a - lie rod 3/4 inch by 7-l/2 feet; welded to the top of boom d and 
 pipe b. 
 
 b - 3-1/2-inch standard pipe extending 1 foot above cross fitting. 
 
 c - Chain. U-bolt connection limits arc of travel of boom. 
 
 d - Boom, 3-l/2~inch standard pipe 8 feet long. 
 
 e - 3/8-inch preformed cable for hoist. 
 
 f - Iron bar l/2 inch by 4 inches by 3 feet 3 inches welded to up- 
 right;-; i_-jL and plates g-g. Top of bar is 4 inches below top 
 of upright. Seven holes are drilled as shown for sheave hook. 
 
 g - 3/8-inch metal plate welded to upright i and to top member n. 
 
 h - Chain, limits sre of travel of boom. 
 
 i - "Derrick frame upright made of 3-l/2-inch standard pipe in two 
 sections to allow demounting. Top of truck frame to top of 
 ferrule J. is 6 feet. Top of ferrule j. to top of upright is 2 
 feet, Total height must not exceed state highway regulations. 
 
 j. - Ferrule made of 4-inch standard pipe 1 foot long, welded to upper 
 end of lower section of upright. (The top of j_ cannot exceed 
 the height of the garage door where the truck is housed.) 
 
 k - 3/8-inch plate welded to frame upright and bolted to truck frame 
 with three 3/4-inch bolts. 
 
 1 - U-bolt support of housing in front of gear-shift box. The support 
 is bolted to an angle-iron strap attached to the cross member 
 of the truck frame. 
 
 m - Gear-shift box. 
 
 n - Steel plate l/2 inch by 6 inches by 2 feet 10 inches welded to 
 
 plates g and to croo3 braces, so that the angle between the up- 
 right?; jL-jl and plate n is approximately 100°. ITine holes are 
 spaced at approximately 4-inch intervals drilled to take the 
 l-l/4-inch stem zz,. 
 
 o - Steel plate l/2 inch by 2 inches welded to n and to g to rein- 
 force n and provide additional bearing for _zz. 
 
 p_ - Iron braces l/2 inch by 1-3/4 inches welded to uprights. 
 
 q, - Brake cable, 3/l6 inch preformed, extending from brake lever 
 
 through sheave attached to truck frame, thence over sheave near 
 top of derrick frame with the free end extending as required to 
 be within roach of loader. 
 
 r - Idler roll for hoist cable. 
 
 s - 2-inch by 2-inch angle-iron supports for power take-off equip- 
 ment . 
 
 t - Metal plate support in ; rear-axle housing. 
 
 u - 3/4-inch U-bolt supporting rear-axle housing. 
 
 v - Hubs and brake equipment of rear axle. 
 
 w - Lover arm for brake operation. 
 
 x - Drum for hoist cable. Core 5 inches in diameter by 5 inches long. 
 
 y - Cross for 4-inch pipe. 
 
 jz - Steel plato welded to cross. 
 
 ?z - Steel stem l-l/4 inches in diameter passing through and welded to 
 z and welded to the top of the cross ~j_ v '° ar to center d at 
 right angles to the long axis of d. 
 
 R899-24 
 
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iimiuprSITY OF FLORIDA 
 
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