US2876A - John grylls - Google Patents

Description

mann srarns PATENT orrion JOHN GnrnLs, or PoRTsE, ENGLAND.

snlrs cAPs'TAN on WINDLAssANn denne-sterren..

Specification of Letters Patent No. 2,1876, dated December 12, 1842.

To all whom it muy concern: s

Be it known that I,- JOHN GRYLLS, a subject of the Queen of Great Britain,` and now residing at Cumberland street,-`Portsa, in the county of I-Iants, in the Kingdom of England, shipwright, have invented or discovered a new and useful Invention of certain Improvements in Machinery Used in Raising or Lowering Weights; and I do hereby declare that the following is a full and exact description thereof.

My invention of improvements in machinery for raising or lowering weights is divided into two sections and consists firstly in improvements in the form or construction of the whelps applied to or formed on the barrels of windlasses, capstans Vand other such barrels used for raising or lowering weights and secondly in an improved construction of stopper for cables.

In order that the construction Vof my improved whelps may be more perfectly understood and distinguished' from those at present in use, I'have exhibited in the accompanying drawings views of both the new and old construction of whelps.

Figure 1 represents a front and side view of the old construction of whelps intended to be applied to a capstan. Fig. 2 represents similar views of the old whelps intended for a windlass. Upon inspecting these fig-V Y ures it will be seen that both thesides of the whelps are parallel to each other. Fig. 3 exhibits front, side and back views of my improved whelp intended to be applic-dto a capstan and Fig. 4L exhibits front and edge views of the same as int-ended for a windlass.

It will be seen that the sides of my improved whelps instead of being parallel to each other as in the old construction have side angles or inclined planes formed thereon as it will'beV seen that the whelps are wider at the top and bottom than at the middle at a or where the top and bottom pieces form the obtuse angle as at a.

It has been found by experience that upon winding up a rope, chain or cable by means of a capstan or windlass with the old construction of whelp as seen in Figs. 1 and 2, the rope, chain or cable which is originally placed around the whelp at a will gradually as the capstan or windlass revolves creep up or down the whelp tothe points o from whence it must be brought back again to a before the operation of winding can Vbe continued. From this it will4 be easily underlent jerks to which it is liable when moving from a large circumference to a smaller one. Bylmy improved whelp however all this is avoided and `there is no necessity ,to stop the winding operation of the capstan, windlassV or other barrel to lowrthe rope to its original position at a as the side angles oriangu-V lar inclined sides of my imprvedfwhelps elfectually prevent the rope, chain or. cable from creeping upward or downward Vand consequently prevents the sudden singe be--Y fore alluded to when the old whelps are employed and therefore the riskof snappin'gnthe rope or running out is avoided.

Fig. 5 represents the side elevation of a capstan having my improved whelps applied l thereto and Fig. 6 isa similar view of a v windlass with the improved whelps which ,in

order tov show them-more distinctly .are

colored in both these figures. i

Fig. 7 exhibits a Slight alarmen-inthe construction o f my improved whelp in which l the side angles or vinolinedsides instead of extending down to the centerfand'meeting at the point a are made shorter.

The second part of my invention `relates to an improved constructionof oablestopper and consists -in the employment of -two parallel surfaces between which the cable passes freely when the surfaces are separated but will be retarded more or less or wholly stopped depending upon the approach of the two parallel surfaces and it will be found that by 'means of employing such parallel surfaces and holding a considerablelength of the Cable longitudinally between 'them Vthat a cable may bebetter governed in its movement or wholly stopped than by of the cable stopper nowl used.

Fig. 8 represents a side view of my-improved cable stopper andv Fig. 9 is an end view of the same. The parallel surfaces are seen at a', Z2 and are made of oak or`other wood7 the grooves in their workingV surfaces the use being' lined with iron or the parallel surfaces may be made wholly ofV iron or other suitable ma-terial. The parallel surfaces areconnected together by bars c, c, o ina similar manner `to a parallel'rule and d is forked: lever having slots formed o-n each side-of .A the fork and in which work the pins e and f, ,f

one pin e being connected tothe upper parallel surface a and theother one f to the lower surface I). From this it will be evident that by moving the forked lever d, the parallel surfaces will be brought towards or separated from each other as the case may be and that as a considerable length of cable is placed longitudinally between the parallel surfaces a. very great amount of resistance may be obtained. Instead of employing a lever as at Z for bringing the parallel surfaces a and b nearerto or separating them further from eachother, a screw or any other suitable mechanical power may be used in place thereof. Y l

Iewould here remark that when Vthe sto-pper is intended for yhempen cables, I make the grooves in the working surfaces a and b e semicircular.

Having now described my invention and the manner of carrying the same into eiect, I wishV it to be understood that I claim- 1. Constructing or making whelps to be 'applied to capstans, windlasses and other means of which angular or inclined sides the 'Y cable is prevented from` suddenly singeing or running out as is the case withV the old whelp.

2*'.V I claim the manner of constructing Y cablestoppers with parallel surfaces capable of holding on to a considerable length ofv cable at one time, Ithe same beingconstructed I as shown and described in reference toFigs.

8 and 9 of the accompanying drawings. `V Y.

In witness whereof I, the'said Y J OH'NY L' GRYLLs,-have hereunto set my hand and sealV j j Y this twenty-sixth day of August, in the year Y Y of our Lord .one thousand eight hundred and forty-two. Y

Y JOHN GRYLLS.V [n."silgV Witnesses: i e

I-IENRY Woon, J osEPH BAGALFE'ITL

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