US1264789A - Piston for hydraulic cylinders. - Google Patents

Description

' A. B. HASWELL. PISTON FOR HYDRAULIC CYLINDERS.

APPLICATION FILED APR. I8, 19!]- IfifiIfifiSh.

Patented Apr. 30, 1918.

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V I n Mk :5. 54 WEI/W A. B. HASWELL.

PISTON FO R HYDRAULEC CYLINDERS. APPUCATION FILED AP 18. 1912.

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ARTHUR B. 'HAswnLL, or ENSLEY,'ALABAMA.

PISTON roe HYDnA LIooYLINnnns;

memes.

To allwhom it may concern:

Be'it known that I, ARTHUR B. HAswELn, a citizen of the United States, residing at Ensley, in the county of Jefferson, State of Alabama, have invented certain new and useful Improvements in Pistons for Hydraulic Cylinders, of which the following is a specification.

My invention relates to an improved piston for hydraulic cylinders, comprising a series of brass or soft metal split piston rings which in turn are expanded by a series of wedges, spaced'at equal intervals about the circumference of the piston thimble or center, and the objects of my improvement are, first, to make the use of metallic packing practicable-;second, to make it possible to adjust same without removing the iston from the cylinder ;third, to reduce the cost of repacking, the loss of time on operation and loss of water on leaky cylinders.

The accompanying drawings illustratean embodiment of my invention.

Figure 1 is a longitudinal section on the assembled piston.

Fig. 2 is an elevation of the center of the piston.

Fig. ririgs.

Fig.

Fig.

Fig. key.

Fig. 8 is a longitudinal section of another construction of the assembled piston.

The piston in its preferred embodiment comprises the combined rod 1 and center 2. This center is provided with three or more slots (four in the case illustrated) or keyways 3, spaced at equal intervals about its circumference. On this center are placed the piston rings a which are split for the purpose of expansion, as shown at 5 (Figs. 3 and 4), and which are held in place by the followers 6 and 7. Follower 7 is preferably screwed on the piston rod 1 and fastened in place. Follower 6 is placed on theopposite end of the piston, after tapered keys 8 are 3 is an elevation of one of the piston i is a section thereof.

5 is an elevation of one of the liners. 6 is an edge view of a group of liners. 7 is a perspective View of a tapered Specification of Letters Tatent, Application filed April 18, 1917. Seria1No.162,878; j- ,1

inserted in their respective slots 3, and held in place by nut 9.

In operation the piston is assembled as described above. ,"When new the split piston rings 4 are made a slip-fit in the cylinder; therefore, for a time the leakage is nominal. As soon as rings at wear an excessive leakage takes place. The back cylinder head is removed and the follower 6 is taken from they piston by first removing nut 9. Next in the annular groove provided in follower 6 is placed one of the liners 1.0, its thickness depending upon the amount that the rings 4: are worn. F ollower 6 is now replaced on piston and forced to shoulder on center 2 by screwing on nut 9. This causes tapered keys 8 to travel forward the exact thickness of the liner 10 and in turn forces piston rings at out to the cylinder wall. This operation is repeated until keys 8 have traveled their maximum and rings 4 have worn to their minimum thickness.

Gare should be taken never to insert liners 10 unless it be possible to shoulder follower 6 against center If clearance is left between them the piston rings l are free to separate the same amount and leakage occurs.

Although it is preferred to make the rod 1 and center 2 a unit. I find in practice that it is often impossible. In Fig. 8 there is shown a piston, the rod 11 of which is too large for the construction above described.

This difiieulty is overcome by making the rod 11 and the center 12 of separate pieces as shown.

With reference to the tapped holes 13 (Figs. 1. and 8) these are for eye bolts. To remove follower 6 from the cylinder, eye bolts are screwed into these tapped holes. By this means follower 6 can be drawn from the cylinder without removing the entire piston.

Though I have described a certain specific embodiment of my invention yet it-is not to be understood therefrom that it is restricted to the specific embodiment disclosed. vanou's modifications in detail and in the arrangement of the parts may be made by those'skilled in the art without departure from the invention as defined in the following claims.

What I claim is 1. In a piston, a series of split piston rings, a series of tapered keys, a liner and a back follower for forcing said tapered keys forward to expand said series of rings.

2. In a piston, a series of split piston rings, a series bf tapered keys, :1 back fol- 10 pered keys forivard to expand said series of piston rings.

In witness whereof, I have hereunto signed 15 my name.

ARTHUR B. HASWELL.

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