US66332A - Improved sgkew-olamp foe plankizw vessels - Google Patents

Description

J. D. HATHAWAY.

scm-..Wl CLAMP PoR PLANUNG VESSBLS.

No. 66,332. Patented June 2, 1867:.

l @uitrit-.tatie atnt ffrz.

IMPROVED SCREW-CLAMP FOR PLANKIN G VBSSELS.

' @he Stlgthule referrer tu in fliet' Enters lgatentautmnking pint nf tigt snm.

TO ALL WHOM I'l MAY CONCERN:

Be it known that I, JAMEs D. HATHAWAY, of'A Medford, in the county of Middlesex, and Commonwealth of iassachusetts, have inventeda new and improved Screw-Clamp for Flanking Vessels and I do hereby declare the following to be, a full and exact description thereof, reference being had to thc accompanying drawings, and `tothe letters of reference marked thereon, in which- Figure 1 is a side view of the instrument Figure 2 isan edge vicwof the same. l V

The nature of my invention consists in so construe-ting the screw-clamp that, when used in planking a vessel which is sealed up on the'inside, one end, a, of the clamp may be inserted between the knees or timbers of thc vessel, and held there firmly by means of the serratedcam b, attached to one end of' the clamp, while the other end comes out over the plank to be brought and held in position to be fastened Vto the outside oil' the timbers.

To.enable others skilled in the art to makevand use my invention, I will nroc-ecd vto describe its construction andoperation. i i

I make the clamp-frame c of any'desired shape and strength. I tlicn attach Ytothef shorter end d ot` the frame u a serrated cam, z, havinga perforation near its smaller end {it-ted to go on and-turn upon said shorter end d ot' the frame c, prepared for that purpose as nn axle. The axle may be provfrled with a n'nt and screw to hold the cam b in its place, or it muy be headed down to hold it as in the drawings. l'lhe advantage ofthe nut and screw is to facilitato the exchange of one camfor another when the timbers are different distances apart and require cams 0f different sizes. I cnstructrthe cam in the ordinary way, but. make its axis of revolution nearer the smaller end, and cut teeth e e in the larger' end opposite its axishof revolution. In the other or longer end of t'ruie c is cut a female screw, f, 'into which is fitted Vthe male screwg, to the inner end of which is attached a head or cap, `,so made as to allow the screw g to be turned, when the cap is placed against any substance, without the cap itself revolving. The outer end of screw g is provided with a suitable handle, z', for turning the screwi A By insertn'g'the end of the clamp having the cam attached between the knees` or timbers of the vessel, the teeth e e fix into one timber, and the smaller end braces against the opposite timber',` so that when power is applied to draw it outward it takes fast hold, and becomes more `firmly attached the great-or the= powcr applied. The cap z of' the male screw g is then brought to hear upon the plank to bc attached to the outside of the timbers, and by turning the screw g it is Abrought up against the timbers and held there until fastened.

I am aware that screw-clamps have been in use for a. longtime. Mine differs from them in construction.

I do `not claim the screw-clamp patented to Abram Perrin April 5, 1864; but I claim, and desire tosecure by Letters Patent- A screu'clamp, ,consisting of a frame,`a Ina-le and female screw, and a serrated cam, combined and operating substantially as described.

JAMES D. HATHAWAY.

Witnesses:

A. BADGER, JAMES O. CURTIS.

Images