US96568A - Improvement in capstans - Google Patents

Description

JAoo'B EDSoN, or BoSToN, MASSACHUSETTS.

Letters Patent No; 96,568, (lated November. 9,1869.

IMPRVEMENT IN marsa-ANS.

The Schedule' referred to in these Letters Patent and making` part of the same.

To all persons to whom these presents 'may come Beit knownthat IJAooB Epson, of Boston, of the county of Suolk, and State vof Massachusetts, have made a new and useful invention, having reference t'o Gapstans for Navigable Vessels; and I do hereby declare the same to be fullydescribed in the following specification, and represented inthe accompanying drawings, of which- Figure 1 is a transverse section of a lcapstan, as provided with my invention.

' Figure 2 is a top view of it, as it appears lafter remmfral of the head from the barrel, the spider, and the sha Figure 3 is an under-side view of the head.

Figure 4 is a vertical section of one of the pawls of the head, such section exhibitingnot only the connection of such pawl with the head, but the bearinglip of the pawl. y

Figure 5 is a horizontal section of the capstan,I it being taken through the ratchet of the capstan-shaft, or spindle.

In these drawings- A denotes the base, and B the barrel of the capstan, the latter being supported by, and so as t-o'be capable of being revolved on a spindle, C, extending upward-from the base.

The barrel, at its lower part, isfurnished with pawls a a, to operate in and with a dentated groove, b, formed inthe base A.

At its upper part, the barrel has a concavity or chamber, c, whose surface is provided with'an internal gear, fl, whose upper part is circumscribed by a ratchet or circular toothed rack, e.

A spider, or circular box or frame, D, is larranged within the chamber c, and 'rests on a bearing, f, projecting from its bottom.

This spider carries two gears, g.g, which engage with the internal gear d.

Furthermore, the spider is provided with one or more pawls, h, to engage with a ratchet, i, formed on or fixed to the spindle C.

The two gears g g engage with another such gear,` k, projected downward from a short journal, l, which also extends downward from a bar, m.

This bar goes dametrically across the chamberl of the capstan-head E, which is concave-convex in form, and is provided with holes or sockets, n n, to receive the 'ends of the capstan-bars generally employed in revolving the head.

There are pivoted to the bar m, two pawls 0 o, each of which, at its heel, is furnished with a lip, 1), which is extended back from the pawl, so as to heal' against the bar, when the pawl is in engagement with the ratchet or circular rack e.

The purpose ofthe lip is to relieve the pivot or centre-pin from strain while the capstan is. in operation. It also prevents the pawl from dropping too far while the capstan-head is either being taken off or -put in place on the capstan-barrel. It also regulates the inclination of the pawl.

There is applied to each of the capstan-head pawls o o,- a mechanism or` means by which the -pawls may at any time be readily raised out of engagement with the circular. rack e. l

, The devices for this purpose consist of a knobbed plug, t4, and cords or ropesvq q, extended i'lhereirom, and fastened tothe pawls. f

The knobbed plug is inserted in ka socket or hole, 1, made through the oapstan-head. y

' By taking hold of the knob of the plug, and drawing the plug out of. its hole, the pawls, by the cords, may be simultaneously raised out of engagement with the rack. p

Thisfis usefil'in the case of overriding of the cable on-the barrel of -the windlass, or of setting free the barrel, so that it may freely revolve back, and restore the cable-coil to its proper position.

` The short journal l, heretofore named as extended l support the spider, which from the bar. m, serves to can revolve on such journal.

The shoulder s, at the upper part of the journal, serves to keep the spider from rising oli' its seat. The capstan-headlis pivoted on lthe spindle, which serves as a centre therefor, the head being capable of being freely revolved, in either direction, horizontally von the spindle.

When, however, thevhead is turned veither way, the barrel will be revolved in the same direction.l Turning-the head one way, causes the pawls there-r of to engage with the circulairack and revolve thej barrel, the spider being then .free to revolve with the barrel.

vBut when the head is turned theother way,- the pawls will slip over the rack-teeth, the spiderwll be held stationary on the spindle, by means of the pawls of the spider and the ratchet of the spindle. As a consequence, the gear of` the head will revolve the gears of the spider, which, throughtheir action on the internal gear of the barrel, will canse the barrel to revolve. p

I claim as my invention, the following, viz: v

1. TheA capstan-pawlio, as made with the lip p, arranged to relieve the centre-pin. from strain, as described, such lip being for other purposes, as explained.

2.' The arrangement 'of the plug tand the lines q, with the pawls o and the capsta'mhead E.

3. Thecombnation, as well as the arrangement, of

the jou'rnal l with .the capstan-headE, the pinion k,

and th e rotary gea1"frame.orspider D, arranged within the ca'pstan, as -set forth.

I4. The arrangement' of the auxiliary pawl or pawls f hand the ratchet i with the spindle O, the rotary spider D and its gears, the capstan-head and its pinion and pawl or p'awls, and the capstan-barrel-and itsv internal gear.

JACOB EDSON.

Witnesses: v v

R. H. EDDY, S. N. Plrnn.

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