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 numberUS1114008 A
Publication typeGrant
Publication dateOct 20, 1914
Filing dateOct 31, 1913
Priority dateOct 31, 1913
Publication numberUS 1114008 A, US 1114008A, US-A-1114008, US1114008 A, US1114008A
InventorsJohan Kofoed
Original AssigneeJohan Kofoed
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Duplex steam-pump.
US 1114008 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)




1,1 14,008, Patented Oct. 20, 1914.


"r -m\\'\ kw I wdim as: e. s; t/n ue m {Me J. KOFOED.



Patented Oct. 20, 1914.



JOHAN KoroEn, orcnnrsrmnm, NORWAY. j i

DUPLEX s'rniuvnrmvrn Specification of Letters Patent. P t nted t 2 0,. 1914',

Application filed October 31, 1913. Serial No. 798,412.

To aZZ whom may concern:

ject of the King of Norway, residing at Christiania, new and useful Improvements in Duplex Steam-Pumps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will en able others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to steam pumps and more particularly to that type known as duplex pump.

The object of my invention is to produce a steam pump which, at difierent speeds and pressures, will work with full strokes without re-adjustment and which also will be economic in the use of steam, without interference withthe general principle of operation characteristic of this type of pumps.

In describing my invention I have reference to the accompanying drawings showing, by way of example, one form of construction.

Flgure 1 IS a vertical, longitudinal section through one of the cylinders of the steam engine part, the water end not being shown because its construction and mode of operation are well known. Fig. 2 is a plan view partly in section of the two shde valves with the valve rods and valve mechanism.

Fig. 3 is a partial cross section through the slide valves, the steam chest and the two cylinders, the left hand side of the figure being a section along line a-a in Fig. 1,

and the right hand side a section along line Z)b in Fig. 1. Fig. 4 is a detail, being a section along line c0 in Fig. 1.

The cylinders 1, 1, containing each a piston marked 2, are provided on each end with single channels 3 and 4, respectively, connecting the cylinders with the steam chest 5. The slide valves 6 and 12 are of the well known .D type.

The slide valve 6 is partly operated by the valve rod 8 which in turn is moved by the piston rod 9 of its corresponding cylin-l 10, and partly by the der through the lever rod 11 connected to the slide valve 12 of the companion cylinder (Fig. 2). The. rod 11 is provided with a laterally pro ecting arm 13 loosely embracing the rod 8. On

3 ends Norway, have invented certain. I

ishde the '16,

steam chestat each end thereof and bearthe collars 15 contact with one of the projections 19 on that of the piston 2, the steam admission and exhaust ports of by compression springs 14: abutting with one end against saidarm 13 and with the other against upward projections 19 on the iseifected between the said slidevalve and the rod llof the slide valve 12. The rod Sof slide valve '6 is provided with collars 15. 16 are rocker arms fulcrumed on the ing. with one end against said collars 15 and with the other ends against washers 18, provided on rod 11.

slide valve 12 are placed springs 17.

The operation may be shortly described as follows :T he steam when entering cylinder 1, shown in Fig. 1, through the steam port forces the piston 2 in said cylinder in the direction of the arrows toward the left hand end of said cylinder. In the position of the piston, as shown in Fig. 1, one of on the valve rod 8 is just in the slide valve 6 and, as the piston 2 in cylinder 1 travels farther toward the end of said cylinder, it will, through its piston rod9 and lever 10, move rod 8 and thereby the slide valve 6 in a direction opposite to the valve 6 closing both the] cylinder. At the same time, by means of the rocker arms'16 on the right in F igs..

1 and 2, the slide valve 12 is moved by its rod 11 to (shown in dotted lines in Fig. 1) in the other cylinder will be reversed, the steam admission port 4 of its cylinder having been opened by the displacement of the valve 12. As this latter piston travels toward the left in Fig. 1, it will, when it OFFICE- each sideof said arm the rod 8 is surrounded Be it known that I, J OHAN Koronn, a subvalve 6, whereby a yielding connection Between these washers and upward projections 20 on thesuch a position that the piston'2 1 reaches the position of the first mentioned piston, shown in Fig. 1, moveits corresponding valve 12 in a direction opposite to the first movement of said valve so that, as the said piston reaches admission and exhaust ports of its cylin der will be closed bythe valve'12, while by means of the arm 13 effected by means of the fixed collars 15 on the valve rod 18 as the piston of the the end of its stroke, the

on the piston rod. 11 and the action of the-springs 14:, the .po-

' corresponding cylinder travels toward the end of its stroke, while the reversing of the piston-is performed by the other piston through the yielding spring connections.

I claim In a duplex pump a steam chest, steam cylinders, a piston ineach: cylinder, a

ingly connected with each valve, connecting means between each valve and the piston its stroke, projections on said slide valves, springs between said collars and said projections, and rocker arms pivoted on the steam, chest to cooperate with the said rods for the purpose of transmitting the motion fro'm the rod of one slide valve to the other slide valve. slide valve for each cylinder, a rod yield- In testimony that I claim the foregoing as my invention, I have signed my name in 7 presence of two subscribing witnesses.

of its corresponding cylinder, collars on the said rods-adapted to move the corresponding slide valve when the piston of the corf responding .cylinder approaches the end; of

, JOHAN KOFOED. Witnesses:


Copies of this patentmay be obtained for five cents each, by addressing the Commissioner of Patents,

.v i, Washington, D. 0." v

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5240390 *Mar 27, 1992Aug 31, 1993Graco Inc.Air valve actuator for reciprocable machine
US5280808 *Apr 21, 1993Jan 25, 1994Graco Inc.Air valve actuator for reciprocable machine
U.S. Classification91/195, 91/346
Cooperative ClassificationF04B1/02