US2169289A

US2169289A - Engine

Info

Publication number: US2169289A
Application number: US144514A
Authority: US
Inventors: Samuel B Robbins; Marshal P Scholl
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-05-24
Filing date: 1937-05-24
Publication date: 1939-08-15
Anticipated expiration: 1956-08-15

Description

Aug. 15, 1939. s. B. ROBBINS E AL 2,169,289

ENGINE Filed May 24, 19:57 a sheets-sheet 1 aef 0 115M022 JcZoZZ 7 INVENTORS myam ed.

ATTORNEYS Aug. 15, 1939.

s. B. ROBBINS :r m.

ENGINE Filed May 24, 1937 5 Sheets-Sheet 2 62177241?) 1 .055 Mrsfia 272$, 22 1NVENTOR5 Aug. 15, 1939. s. B. ROBBINS El AL ENGINE Filed May 24, 1937 3 Sheets-Sheet 3 mv lm m mm BJWN nth z@ Samuel 5. Robbins ATTO RN EYS Patented Aug. 15, 1939 UNITED STATES ENGINE Samuel B. Robbins, Boise City, Okla., and Mar- Ellensburg, Wash; said Robbins assignor of one-half to said Scholl Application May 24, 1937, Serial No. 144,514

shal P. Scholl,

2 Claims.

This invention relates to an engine of the reciprocating type and more particularly to means for connecting the crank shaft to the connecting rods of the pistons for eliminating piston drag on the walls of the cylinder and thereby materially retard cylinder wall and piston wear.

With these and other objects in view this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of our invention, reference is to be had to the following description and accompanying drawings, in which Figure 1 is a transverse sectional view illustrating an engine constructed in accordance with our invention.

Figure 2 is a similar view illustrating another position of the connecting means than the positions shown in Figure 1.

Figure 3 is a sectional 33 of Figure 1.

Figure 4 is a sectional view taken on the line 4-4 of Figure 2.

Figure 5 is a diagrammatical view showing the present invention bringing about a travel of the connecting rod in a substantially straight path and the various positions of the pistons in accordance with the various positions of the cams.

Figures 6 to 13 inclusive illustrate the various positions of the cam for operating the pitman whereby the travel of the connecting rod is maintained in a substantial straight path.

Referring in detail to the drawings, the numeral I indicates the cylinders of an engine having reciprocating pistons 2 and mounted upon a base 3, the latter extending laterally of said cylinders and provided with a removable crank case 4. The pistons 2 are equipped with the usual connecting rods 5, which extend into the base. Journaled to the base and located laterally of the pistons is a crank shaft 6. An auxiliary shaft 1 is journaled inv the base with the crank shaft 6 located between said auxiliary shaft 1 and the connecting rods 5. Arms 8 are integral with the shaft 1 and have pivoted thereto floating levers 9, the opposite ends of which are joumaled on the connecting rods 5 as shown at 5'. Auxiliary connecting rods H] are pivoted to the levers 9 as shown at 9' and are journaled tothe cranks of the crank shaft 6. An arm I l is formed integrally with the auxiliary shaft 7 and extends in an opposite direction to the arms 8 and has pivoted thereto a pitman I2 slidably supported by a bracket l3 carried by the crank case 4. The

view taken on the line PATENT OFFIQE free end of the pitman terminates in a head M which rides on oppositely arranged cams l5. The cams form an integral part of the crank shaft.

A coil spring 48 is interposed between the bracket I 3 and the head M to maintain the latter in con- 5 tact with the cams.

In conventional engine construction where the connecting rods of the pistons are journaled directly to the cranks of the crank shaft causes the pistons to drag against opposite walls of the 10 cylinders during the reciprocation of said pistons thereby wearing away said walls and cause said cylinders to rapidly assume a substantially egg shape causing piston slaps, loss of compression and the passing of fuel by the pistons to the crank case and consequently render an ineflicient operating engine. An engine constructed in accordance with our invention and heretofore specifically described will permit the connecting rods 5 to travel in a substantially vertical path throughout their entire movement and thereby eliminate the pistons from dragging against opposite walls of the cylinders.

To clearly describe the substantially straight line travel of a connecting rod during the down and up strokes of a piston, reference is made to Figure 5 which is a diagrammatical view showing the path of travel the connecting rod is made to take by the present invention. This showing is based on one complete revolution of the crank shaft, wherein eight positions of the crank are given, each position being forty five degrees apart, also showing the eight positions of the piston, the eight positions of the pivot 9, eight positions of the cams l5 and eight positions of the journal 5'. This view further indicates by the character A the positions taken by the arms 8 and H during the eight positions of the crank of the crank shaft. Thus during one revolution of the crank of the crank shaft the piston moves down from its uppermost position to its lowermost position and back to its uppermost position. During this travel of the piston the journal 5' travels in a substantially straight line. Consequently the connecting rod moves in a. path according to: the path of travel of the journal 5' and the lever 9 moves back and forth for a limited distance by the oscillatory movements of the arms 8 and l! actuated by the cams acting on the head I4 of the pitman l2.

Having described the invention, we claim:

1. An engine comprising cylinders, a base for said cylinders and extending laterally of the latter, pistons reciprocally mounted in the cylinders, connecting rods carried by said pistons and ex- 55 tending into the base, a crank shaft journaled in the base laterally of the cylinders, an auxiliary shaft journaled to the base laterally of the crank shaft and the cylinders, arms integral with the auxiliary shaft, floating levers pivoted to said arms and the connecting rods, auxiliary connecting rods connecting the floating levers and the cranks of the crank shaft, an arm formed on the auxiliary shaft and extending in an opposite direction from the direction of the first-named arms, a pltman slidably supported by the base and having one end pivoted to the second-named arm, and cams carried by the crank shaft for operating the pitman.

2. An engine comprising cylinders, a base for said cylinders and extending laterally of the latter, pistons reciprocally mounted in the cylinders, connecting rods carried by said pistons and extending into the base, a crank shaft journaled in the base laterally of the cylinders, an auxiliary shaft journaled to the base laterally of the crank shaft and the cylinders, arms integral with the auxiliary shaft, floating levers pivoted to said arms and the connecting rods, auxiliary connecting rods connecting the floating levers and the cranks of the crank shaft, an arm formed on the auxiliary shaft and extending in an opposite direction from the direction of the first-named arms, a pitman slidably supported by the base and having one end pivoted to the second-named arm, a head on the free end of the pitman, oppositely arranged cams formed on the crank shaft and engaging said head, and spring means engaging the head to cause the latter to ride the cams.

MARSHAL P. SCI-IOLL. SAMUEL B. ROBBINS.