US107247A

US107247A - Improvement in clamp

Info

Publication number: US107247A
Authority: US
Publication date: 1870-09-13
Anticipated expiration: 1887-09-13

Description

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FRANCIS cLAssEn', or vMrs'rrc Binnen,- CONNECTICUT.

' LetterePatent No. 107,247, dated VSeptember 13, 187i).v

Mon-

IMPROVEMENT IN CLAMP.

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

-planking against the ribs of a ship during the operaltion of spikingand 'treenailipg the rplanking 'to `the ribs, consists in combining with' the tightening-screw,

-and serrated dogs of the clamp, springs for automatically enpanding the dogs', and a rope or cord fer clos-l ing the same, as well as a hook on the inner end of theclamp-platc, ali arranged and operating substantially as hereinafter set forth, thereby affording sufficient resistance to the screw for bending andA bracing the plank to the ribs while heing'spiked and treenailed, as I will further explain 'by reference to the nccompanying drawing, of which--4 VFigure 1 is an elevation of my invention; y

Figure 2,' a plan of saine, showing the serrated err-- pansive dogs between the rib's, while the screw is bracing a plank against said ribs;

Figure 3 represents my inventicn with the expansive serrated dogs thrown outward and clutching the inside of the ribs, inthe absence oi' the skin ot' the vessel; and y l Figure 4, a plan of one of theexpansive serrated z ogs.

In the said drawing- A A indicate the ribs;

B, the skin or ceiling of the inside; and4 C, the plankingor outside of -the ship.

lD is the clamp-screw, provided with a journal, E, on itsinuerend, on which are placed the expansive serrated dogs F F, which are serrated at f on the outside, and having hooks g g on'the inside, said dogs being ,conlined on the journal E by a spring key, G, or, instead of the key, the dogs may he attached by a screw and nut on the outer end ofthe journal.

HH are springs attached to the clamp-plate d, and to the dogs,.t'or the purpose of expanding the dogs, and K is a small rope, which, when Ih'awu on, acts on the springs, closing the serrated dogs, and releasing them from their hold on the ribs, when it may he desired to remove the clamp-screw.

lis a hook on the inner. end of the clamp-plate, an l M is the screw for bracing the plank against the ribs, in resistance to the opposing force exerted by the dogs against the ribs, 1 .l

I would remark that my clamping-screw, when divcsted of the serrated dogs, springs, and rope, leaving only the hook L and zscrew M, can be usedv with profit nvarious purposes in ship building.l

In'lship building, the'ribs on being placed in position, tlieskin or eeiling'on the inside is laid on iu the first place before the plankiug on the outside iscommenced, and, consequently, there` is no means `left for a hearing on theinside of the ribs, to bracethe planking againstthe ribs. a I

The ordinarymethod heilig toiusert eye-bolts in the ribs, and placing reinstafs in the. eye-bolts by means of wedges ydriven between the reinstalis and the plank, force the, plank against the ribs. But this lnethodhas hccn found to consume much labor and expense.

Another method was bymcans ofjack-screws placed between the staging and the planks, for the purpose of bracing the'plank against the ribs. But ipf'thiscase the staging often gave way without effecting the desired object, and occasionally with detriment to the workmen ;v and clamp-screws have also been employed,

with stay pieces wedged between the timbers on which to take hold, 'but were so complicated andinelectivc as to be abandoned.'

These-defects. suggested to me the, seliadjusting clamp-screw comprising thesuhject of this applica-v tion, which is simple in construction, ellicient and convenientin use,a dapting :itself instantly to every variety of space between .the ribs, and affording sulicient power -for bracing the planking to the ribs dur,- ing the operation of spiking and treenailing the planking to the ribs of -a ship.

` I am aware that a patent was granted to John J.

' Hill, November 2 6,1867,for clamp for planking shipsy sides, in which serrated dogs are'claimed.; butIdo not claim such.

v Having described my invention,

What I clai rn, and desire to secure byv Letters Patent is- 'he springs H H, rope K, and hook L, when used in combination with the serrated dogsF F and screw M, substantially as and for the purposes described and set forth.

In testimony whereof 1 have hereunto set my sig#V 'nature this 21st dayci' September, A. D. 1869.