US1436915A - Crosshead - Google Patents

Description

H. SHOEMAKER. CROSSHEAD.

APPLICATIQN FILED NOV. 10, 1921.

1 436 9 1 5 o Patmted Nov. 28, 19 22;

Patented Na. as, i922.

CRUSSHEAD.

Application filed November 10, 1921. Serial No 514,194.

To all whom it may concern.

Be it known that 1, Hammer Snonnrannn, a citizen of the United States,and a resident of lVollaston, in the county of Norfolk and State of Massachusetts, have invented a certain new and useful Improvement in Crossheads, of which improvement the following is a specification.

This invention relates to engine cross heads and guides, and more particularly to that type in which the cross head slides upon provide an improved and simple construd tion which may be readily taken down and reapplied,to preserve accurate alignment, to Pi'OViClt increased bearing surface for the cross head on the guides, and to prov an improved wearing connection for the cross head which may be readily adjusted for tat:-

ing up lost motion and wear without the use of tools, jigs, or templets and at thesame time maintain correct alignment oi the cross head upon the guides.

One feature of my improvement comprises pair of tubular guides with binder bolts ex ending through the same for securing said tubes to the back cylinder head and to the guide yoke. Another feature comprises split tubular bushings or gibs carried by the,

cross head and mounted on the guides. Still another feature comprises the use or" thin tubular shims surrounding the gibs tor taking up lost motion due to wear.

in the accompanying drawing: Figure 1 a side view partly in side elevation and partly in section, showing a construction at cross head and guides embodying my im- 'irovementg 2, a transverse section taken on the line 2-2 of 1; Fig. 3, a transverse section of the cross head shoe and guide taken on the line 3-3 of Fig. l; and,

head, 7, of the engine cylinder, and at the other end by extending into openings in the guide yoke, 8, the guides being securely held. in position by the hinder or anchor holts, 9,

, bushings or gibs, 11 which may beisplit at one or both sides, and are formed with llanges,12, which are clampedbymeans or I the gib caps, 13, mounted by a screw thread cylindrical guide rods, the ObJGCtS being to connection upon each end of the shoe of the cross head. Tne gibs maybe formed of hronzmgunfmeital, or hard, babbitt,: and as wear occurs between the gibs and the tubular guides, thin tubular shim, 14-, of tin, russia iron, or other sheet metal, may bev inserted between theouter surface ofthe'gibs and the inner sur 'ace oi": theopening through the cross head shoe, The shim preferably e:-:- tends the full length of the shoe to form a lining therefor, and may be split throughout its length, in order that it may be put on over the tubular guide, 6.

The method of taking up lost motion is very simple since it is only necessary to loosen the gib caps, 1:2, and insert a tubular shim, 1-1, or remove the worn gibs and replace them with others, or both of these operations as desired, and then reapply the gib caps, 12, screwing the same up tight in order to securely clamp the nib flanges against the ends oi. the shoe. The gib caps may then be fastened by the set screws, 15, The cross head is provided with the usual piston rod connection, 17, and a main pin, 16, for the main rod, (not shown), which is adapted to extend through the opening in the guide yoke in the usual. manner.

The construction. is exceedingly simple, composed of but few parts, and can be readily taken down and again applied in a minimum time and with a minimum number of tools. Another important feature is the perfect alignment otthe guides which do not vary from correct line even when taken down and again applied. The bearing of the gibs in the cross head is also maintained in perfect alignment withthe guides after the shims are inserted or after worn gibs are replaced with new ones. By means of my improved construction, an increased bearing area is obtained on the guides so that a shorter guide bearing is made possible, thereby reducing weight and espouse,

Having now described my invention, What I claim as new and desire to secure by Letters Patent is:

1. The combination with cylindrical guides, of a cross head having shoes provided with openings for said guides, tubular gibs mounted in said openings, and means for clamping said gibs in position.

2. The combination with cylindrical guides, of a cross head having shoes provided with openings for said guides, a pair of tubular gibs mounted in each of said openings and having flanges at their outer ends, and gib caps for clamping said flanges.

3. The combination with cylindrical guides, of a cross head having shoes provided with openings for said guides, tubular gibs mounted in said openings, and a tubular shim surrounding said gibs.

at. The combination of a tubular guide for a cross head, a back cylinder head having a socket for supporting one end of said guide, a guide yoke supporting the other epd, and a binder bolt extending through said tubular guide and fastened at its end to said back head.

other end, and a binder bolt extending through said tubular guide and fastened to the cylinder head.

6. The combination of a cylindrical tubular guide for cross heads, a back cylinder head having means for supporting one end of said guide, a guide yoke supporting the other end, a binder bolt extending through said tubular guide and fastened at one end to the cylinder head, and means for securing the. other end of said bolt tothe guide yoke.

'7. The combination ofa cylindrical tubular guide for cross heads, a back cylinder head having means for supporting one end of said guide, a guide yoke supporting the other end, a binder bolt extendingthrough said tubularguide. and having a "threaded connection to the cylinder head, and a clamp mounted on the guide yoke for fastening the other end of said bolt.

8. The combination with a pair of guides, having convex bearing surfaces, of a cross head having shoes provided with spaces for said guides, detachable gibs mounted in said spaces and having concave bearing surfaces, and means for fastening said gibs in position.

In testimony whereof I have hereunto set my hand.

HARVEY SHOEMAKER.

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