STUMP PULLERS. Machines for clearing lands of stumps without the use of methods involving explosives.
The Chamberlin, Stump Puller has three legs from 12 to 18 ft. high. according to size of machine. The legs are bolted at the tops to a round iron cap with a concave depression in its upper surface, into which fits a convex washer, on which rides a large internally threaded nut. The lifting screw of the machine passes downward through the nut. The cap and washer constitute a ball-joint, and allow the lifting screw to work at any accidental angle and still maintain a safe bearing on the tripod. The screw has a double thread, beveled. A drooping sweep, attached above to the nut and operated at the lower end with a horse, rotates the nut and lifts the enclosed screw. The latter is to be attached by means of a chain and hook to one of the side roots of the stump to be removed. Two of the legs are fitted at the foot with wheels, and the third with a shoe and draw-hook, to which horses are attached to move the machine from stump to stump. though for long distances a wagon is needed. it is possible for only one man, with a team, to operate the apparatus, but one horse will easily lift the stump as fast as three or four men can clean it of earth. From four to six circuits of the horse, according to the size of the machine, raise the stump one foot, and it should be cleaned as it is being pulled, leaving the dirt in the hole instead of at one side.
The Bennett Stuanp Puller, shown in Fig. 1, requires no horse. It hangs from a tripod, the feet of which are carried on runners for convenient locomotion. The whole operating parts depend from a swivel supported by a clevis. They consist of a large ratchet wheel having a small sheave fastened at one side, upon which is to be wound the lifting chain by the consecutive upward and downward movement of the hand lever, which rotates the ratchet wheel by moans of a dog, while another dog prevents the ratchet wheel from revert ing. The lever can be shifted on a notched fulcrum so as to change the leverage for greater or less strains : thus the ratchet wheel may be moved through an arc covered by several of its teeth, when the work is light, for each vibration of the hand lever, greatly expediting the work. A lower pulley is used in very heavy work, doubling the power at the sacrifice of
speed. The lifted stump is lowered to the ground steadily by the use of the brake, 31. The hook, 0, is hooked over the end of the short pawl, P. The link, G, is hooked over the end of the brake, M. The hand lever is then depressed, permitting the pawl, 11, to disengage by the action of the spring in the hook, 0. The weight of the stuitip then causes it to run down according as the hand lever is eased up. A spring, 7', serves to restrain the link, G, from firing away from the large ratchet wheel while the operator is plying the hand lever.
Rarreys Stump Puller, shown in Fig. 2, pulls trees as well as stumps, as it may be placed at a distance from the work, and the stump or tree pulled in any direction by introducing an intermediary block. In the drawing, one of the corner posts is omitted, to expose the construction. It consists of an upright loose drum and ratchet, through which basses a shaft, round within the drum, and square at, the upper portion, to carry with it a clutch with teeth for engaging and rotating the drum. The shaft has top and bottom bearings, and projects at top through an iron cap, which surmounts the timber framework of the ntachine, and is there fitted with a sweep seat for the sweep lever, to which one horse is attached to do the work. In practice, the machine is set in the ground firmly. and used without change of posi tion to clear stamps from the surrounding land to the extent of as much as two acres of area without removal. Should any Etump stand where the cable used in connection with the winding drum interferes with either corner post of the umehine, the horse is made to travel the other way, winding the cable onto the opposite side of the drum, thus allowing the cable to swing clear. The safety pawl is hold to the cheek ratchet by a spring, and is so made that it. holds in either direction in which it may be set. The power of this machine eau be indefinitely increased by the use of block :Ind tackle attached to a second stump us a pur chase, and it is therefore specially useful in regions of heavy timber, whercrthe stumps are large. It is known as the " California" stump puller.
Sugar Machinery : see Evaporators.