US64972A - Improvement in kecipeocating engines - Google Patents

Description

I'finittr tetes. @ii'itep j WILLIAM '1). GRIMSHIW, or NEWARK, New JERSEY.

I Letters Patent No. 64,972, dated M'ay I2I11867.

ulterior/1suENT 1N' nrcirsoctrme ENGINES.

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I Bo it known that I, WILLIAM DAKIN GRIMSHAW, of Newark, in the county of Essex, und Stute of New Jersey, have invented n cert-in new and useful Improvement on Cushioning Attachments to Reciprocating Pistons, of which the following is u. full, clear; und cxoct description, reference henghnd to the accompanying drawing, forming port of this specification, and in which-L- Figures 1 and 2 represent verticul sections of :tu inverted cylinder, with n reciprocating piston working therein and other nppendngeszpertainingto a. direct-acting hammer that may beIopcrated hy'compressed :tir or other aeriiorm fluid, end showing my improvement as 'applied under two modifications of its construction.

Like letters indicate like parts throughout both figures.

My invention hss reference to cushioning devices applicable to reciprocating pistons generally, irrespective of the description of aeriform fluid employed to operate the pistons, or the particular disposition or arrangement o'f the letter und their cylinders, whether verticnl, horizontal, or occupying on inclined position to the horizon, und is equally applicable to steam or other engines and direct-acting hammers driven by the elastic force or pressure of any seriform Huid.

The nature of my invention consists, in connection with a suitable disposition of' the parts and extension of the cylinder beyond the reciprocating stroke proper of the piston, in providing the latter, on 'either or both -its faces, or the cylinder-head and bottom, or either, wit-h protuberences that serve, on the piston passingI the ezrtreme limit of its stroke proper, to plug 'up or stop, in a free or moveable manner, -tho port or passage, and thereby to shut oil' egress and cause the fluid contained between the'cylinder-cover und piston to oct as u cushion to the lutter, so that, on the piston passing the limit of its stroke, as described, by the breakage or disarrangement of the parte or devices that serve to limit or control the ploy of the piston to c fixed length of stroke, it will be restrained from bursting o1' breaking the cylinder-heed or end, or otherwise producing damage.

Referring to the accompanying drawing, whlchreprcscnts my invention as it may be applied to a. directacting hammer operating, sny, under the force of compressed air, A is the inverted hummer-cylinder, B its lower heed or end, und C its upper cover, having seated on it a. vulve-chest, D, from which E is the upper port or pdssoge, F the lower, and G the exhaust. H is tho reciprocating hammer-piston end I its rod, passing through u studing-box orI gland, J. The cylindery A is of somewhat greter length then that of the piston's stl-o lce when restrained within its extreme or proper limits.

In iig. 1, K K nrc protubernnccs on the faces of thc pieton, so arranged as that, onthe travel ofthe lutter,

I by accident or breakage, beyond its proper extreme limits, they enter and closely lit or slide within, os a. moveuble plug, openings afin the cylinder-heads, that form an extension or part of, as it were, the upper and lower ports E and F, thereby retaining within the cylinder, between the fuceof thc piston and cylinder-head, st the end in which the plug K K fits the port E or F, c certain amount ot' the impelling or elastic fluid, which, in the further sliding of thc piston towards the end of the cylinder so plugged, will act as a cushion toIprevent breakage I I or'lInjurious shock, and to produce an advantageous rebound. y

In lig. 2, substantially the sume cushioning-device is shown us applied to one end of the cylinder; but here .the protuberztncc K is represented oiIn tubular form, und as attached to the cylindcrhced or end,Iand forming a combination, us it were, of the port E, while the piston has n. correspondingly-shuped recess, g, that receives within it the protuberonce K, on the piston exceeding its stroke towards such end of the cylinder, and,

ns in the former ceso, forming c. sliding-plug attachment, as it werc,Ito rctnin the Vfluid in the cylinder to uct es n cushion to thc piston. Of course, though the cushioning device is in this figure only shown as applied to one cnd oi' the cylinder, it muy be used ut both ends.

By the construction und operation, as described, of this my safety-cushioning enrichment, it will be seen that nll brenks or openings in the cylinder, whether by ports or otherwise, causing the piston to catch or cut in th'e reciprocating plan. thereof, even if it should exceed its extremo length of stroke proper, is or may bo` avoided.

What I claim :ts my invention, und desire to secure by Letters Petent, is- The combination 'with n reciprocating piston olIn. cushioning nttnchrnent, operating as n sliding or movc able plug ro :he port or ports of the cylinder, subst-eritinlly os specified. I

. I W. D. GBIMSHAW.

Witnesses: I

J. W. Coon es, G. W. Resv.

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