[Fig. 1167.] shows the arm of an axletree, turned perfectly true, with two collars in the solid, as seen at G and H. The parts from G to B are made cylindrical. At K is a screw nail, the purpose of which will be explained in [fig. 1171.]
[Fig. 1168.] is the longitudinal section of a metal nave, which also forms the bush, for the better fitting of which to the axletree, it is bored out of the solid, and made quite air-tight upon the pin; and for retaining the oil, it is left close at the out-head D.
[Fig. 1169.] represents a collet, made of metal, turned perfectly true, the least diameter of which is made the same with that part of the axletree M, [fig. 1167.], and its greatest diameter the same with that of the solid collar G, [fig. 1167.] This collet is made with a joint at S, and opens at p. Two grooves are represented at qq, qq, which are seen at the same letters in [fig. 1170.], as also the dovetail r, in both figures.
[Fig. 1170.] is an edge view of the collet, [fig. 1169.]
[Fig. 1171.] is a longitudinal section of an axletree arm, nave or bush, and fastening. A, B, is the arm of the axletree, bored up the centre from B to E. C, C, D, the nave, which answers also for the bush. P, S, the collet (see [figs. 1169.] and [1170.]), put into its place. q, q, two steel pins, passing through the in-head of the bush, and filling up the grooves in the collet. W, W, a caped hoop, sufficiently broad to cover the ends of said pins, and made fast to the bush by screws. This hoop, when so fastened to the bush, prevents the possibility of the pins q, q, from getting out of their places. u, u, is a leather washer, interposed betwixt the in-head of the bush and the larger solid collar of the axletree, to prevent the escape of oil at the in-head. K, is a screw, the head of which is near the letter K, in [fig. 1167.] This screw being undone, and oil poured into the hole, it flows down the bore in the centre of the axletree arm, and fills the space B, left by the arm being about one inch shorter than the bore of the bush, and the screw, being afterwards replaced, keeps all tight. In putting on the wheel, a little oil ought to be put into the space betwixt the collet P, S, and the larger collar. The collar P, S, being movable round the axletree arm, and being made fast to the bush by means of the two pins q, q, revolves along with the bush, acting against the solid collar G, of the arm, and keeps the wheel fast to the axletree, until by removing the caped hoop W, W, and driving out the pins q, q, the collet becomes disengaged from the bush.