Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS550721 A
Publication typeGrant
Publication dateDec 3, 1895
Filing dateApr 4, 1895
Publication numberUS 550721 A, US 550721A, US-A-550721, US550721 A, US550721A
InventorsJohn D. Keller
Original AssigneeF One
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 550721 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

(No Model.)


No. 550,721. Patented Dec. 3, 1895.



SPECIFICATION forming part Of Letters Patent N0. 550,721, dated December 3, 1895. Application filed April 4:, 1895. Serial No- 544, l65. (N0 model.)

To all whom it may concern.-

Be it known that 1, JOHN I). KELLER, a

citizen of the United States, residing at Santa Clara, Santa Clara county, State of California, have invented an Improvement in Rotary Engines; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to that class of rotary engines or rotary pumps in which radiallyslidable pistons revolving concentrically with the interior of the shell are operated by an eccentrically-located cylinder which forms an abutment at one side with the interior of the shell and a steam or water space on the other side.

My invention consists of the construction, arrangement, and combination of devices, which I shall hereinafter fully describe and claim.

The object of my invention is to provide a simple and effective rotary engine or rotary pump.

Referring to the accompanying drawings for a more complete eXplan ation of my invention, Figure l is a vertical section of my engine. Fig. 2 is a horizontal section.

A is the shell ofmy engine, mounted upon or formed with a suitable base 13. Through the center of this shell passes a shaft O, on which is pivotally mounted a piston D. There may be one of these pistons or a plurality of them, and for the sake of illustration I have here shown two. They extend in the radial planes of the shell and reach from the center to its interior peripheral surface.

Mounted upon an axis eccentric to the shell a cylinder E, adapted to rotate within said shell. This cylinder encircles the shaft O, which forms the center of the shell, and at one side said cylinder forms an abutment with the interior of the shell, while at the other side it leaves a steam or water space.

The steam entering the inlet side of the shell encounters the piston and drives it around, said piston carrying the eccentric cylinder with it, which constantly forms the proper abutment behind the steam, until, the piston passing the discharge or exhaust side, the steam passes out. Now in this movement of the cylinder sufficient play must be provided between its wall and the pistons to permit it to accommodate itself to the various positions to which its turning carries it with respect to the pistons, and in order to accomplish this I seat in said wall oscillating or rocking bearings G, through which the pistons freely pass. By these means even though the pistons and the cylinderbe eccentric with relation to each other they may revolve freely in connection.

The wear at the abutment between the cylinder and the shell is ver great and needs to be constantly taken up and compensated for. To effect this result I form the interior of the shell with a recess or cavity, into which I insort a wearing abutment-piece Hand bolt it in by a bolt h. This wearing piece, when it becomes worn, may be loosened and a suitable washer placed behind it; or, if necessary, it may be removed entirely and another substituted.

In order to reverse the engine I have the following construction: I is the inlet-passage for the steam, and J are two exhaust-passages, one on either side. The main inlet-passage has branches '2', which communicate each with a passage a to the interior of the shell, one on each side. These communications are controlled each by its own valve K, and said valves also control the communications be tween said passages and the exhausts. The two valves are connected by cranks 713 and connecting-link 7c, and they are so arranged each to control its own communications in such a manner as to admit the steam on one side and exhaust it from the other or the reverse.

It is obvious that this engine may be used as a pump.

The cut-off mechanism consists of intermeshing gears L and L, one being on the shaft center of the cylinder E and the other adapted to actuate the cut-off valve M in the inlet-passage I, and said valve being arranged to cut the steam 01f when the pistons have made about two thirds of their stroke.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

In a rotary engine, a shell having a main inlet passage with branches "6 leading therefrom and communicating at either side of the interior of the shell through passages a, the


separate exhaust passages, valves in said cut-off valve and the other on the shaft cen- 10 branches controlling the exhaust passages ter of the rotatable cylinder.

and the passages leading to the interior of the In Witness whereof I have hereunto set my shell, a cylinder within the shell forming an hand.

5 abutment at one side therewith, and a steam v space on the other side, a sliding and adjust- JOHN kELLER' able connection between the piston and cyl- Witnesses: inder, a main out off Valve in the steam inlet CHAS. E. NAYLOR, and the intermeshing gears one operating the WV. 0. VATSON.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7262352Sep 8, 2006Aug 28, 2007Guido Antonio LavorataSupporting shoulder rest for a stringed instrument
Cooperative ClassificationF04C18/352