US123623A - Improvement in the mode of connecting the piston and pitman of steam-engines - Google Patents

Improvement in the mode of connecting the piston and pitman of steam-engines Download PDF

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US123623A
US123623A US123623DA US123623A US 123623 A US123623 A US 123623A US 123623D A US123623D A US 123623DA US 123623 A US123623 A US 123623A
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pitman
piston
lever
steam
engines
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H21/00—Gearings comprising primarily only links or levers, with or without slides
    • F16H21/10—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane
    • F16H21/16—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for interconverting rotary motion and reciprocating motion
    • F16H21/18—Crank gearings; Eccentric gearings
    • F16H21/22—Crank gearings; Eccentric gearings with one connecting-rod and one guided slide to each crank or eccentric
    • F16H21/32—Crank gearings; Eccentric gearings with one connecting-rod and one guided slide to each crank or eccentric with additional members comprising only pivoted links or arms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/18176—Crank, pitman, lever, and slide

Definitions

  • This invention relates to an apparatus to be interposed between the piston of a steam-engine and the pitman that would otherwise connect the piston with any piece of machinerya crank-pin, for instance-for the purpose of enabling the power to overcome a greater resistance than if connected directly with the pitman.
  • the figure is a side elevation.
  • a is the piston, and
  • the outer end of the piston is in common with the lever b, hereinafter mentioned,passes through slots formed lengthwise of the bars 0 (I, placed one above the other and supported by standards f.
  • the fulcrum of the lever 12 is a pin, 0, connecting said lever with a bar, g, that slides in lugs h, springing from plates Z attachedto the upper side of the bar (1.
  • lugs m projecting upward from the same bar,is pivoted-a lever, n, whose lower extremity is connected by a link, 0,with one end or" the sliding-bar g.
  • the upper extremity of the lever n which is parallel with thelever b, is connected with the same by means of a horizontal link, 4.
  • the lower endof the lever b is connected by a link, i, with the lower end of the parallel lever 1), whose fulcrum is apin, 6, connecting the lever 12 with a bar, 9, that slides in lugs h, springing from plates Z attached to the under side of the bar 0.
  • lugs m projecting downward from the same bar, is pivoted a lever, a, whose upper extremity is connected, by a link, 0, with one end of the sliding-bar g.
  • the lower extremity of the lever a which is parallel with the lever 71, is connected with the same by means of a horizontal link, 0.
  • To the shorter arm of the lever 1) is jointed one end of the pitman j, whose other end may be jointed to the wrist-pin of a crank.
  • the pitman j Inasmuch as the pitman j is connected with the shorter arm of the lever b while the piston to is connected with the longer arm of the lever 1) the pitman must movemore slowly than the piston. This retardation is augmented by making the levers b n, respectively, shorter than the levers b n, and still further increased by making the fulcrums e e sliding, owing to which arrangement the lower ends of the levers b b move more slowly than as though the fulcrums 0 were fixed. The upper end of the lever b is retarded in the same ratio as its lower end, and also moves more slowly than as though the fulcrums a were fixed. This loss in speed is compensated for by a gain in power, enabling the pitman to do more diflicult work than as though it were connected directly with the piston.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Description

R. s. EDWARDS.
improvement in the mode of Connecting the Piston and Pitman of' steam Engines.
No. 123,623. Pat e nted Feb. 13, 1872.
Wz'nesaea. Inventor. C. 6 am Maw-m4 e/Ytty,
j the pitman. jointed to the-longer arm of a lever, b, which,
RICHARD S. EDWARDS, OF SAVANNAH, MISSOURI.
IMPROVEMENT IN THE MODE OF CONNECTING THE PISTON AND PITMAN 0F STEAM-ENGINES.
Specification forming part of Letters Patent No. 123,623, dated February 13, 1872.
Specification describing certain Improvements in Apparatus for Connecting the Piston and Pitman of a Steam-Engine, invented by RICHARD S. EDWARDS, of Savannah, Andrew county, Missouri.
This invention relates to an apparatus to be interposed between the piston of a steam-engine and the pitman that would otherwise connect the piston with any piece of machinerya crank-pin, for instance-for the purpose of enabling the power to overcome a greater resistance than if connected directly with the pitman.
The figure is a side elevation.
Referring to the drawing, a is the piston, and The outer end of the piston is in common with the lever b, hereinafter mentioned,passes through slots formed lengthwise of the bars 0 (I, placed one above the other and supported by standards f. The fulcrum of the lever 12 is a pin, 0, connecting said lever with a bar, g, that slides in lugs h, springing from plates Z attachedto the upper side of the bar (1. Between lugs m, projecting upward from the same bar,is pivoted-a lever, n, whose lower extremity is connected by a link, 0,with one end or" the sliding-bar g. The upper extremity of the lever n, which is parallel with thelever b, is connected with the same by means of a horizontal link, 4. The lower endof the lever b is connected by a link, i, with the lower end of the parallel lever 1), whose fulcrum is apin, 6, connecting the lever 12 with a bar, 9, that slides in lugs h, springing from plates Z attached to the under side of the bar 0. Between lugs m,projecting downward from the same bar, is pivoted a lever, a, whose upper extremity is connected, by a link, 0, with one end of the sliding-bar g. The lower extremity of the lever a, which is parallel with the lever 71, is connected with the same by means of a horizontal link, 0. To the shorter arm of the lever 1) is jointed one end of the pitman j, whose other end may be jointed to the wrist-pin of a crank.
Inasmuch as the pitman j is connected with the shorter arm of the lever b while the piston to is connected with the longer arm of the lever 1) the pitman must movemore slowly than the piston. This retardation is augmented by making the levers b n, respectively, shorter than the levers b n, and still further increased by making the fulcrums e e sliding, owing to which arrangement the lower ends of the levers b b move more slowly than as though the fulcrums 0 were fixed. The upper end of the lever b is retarded in the same ratio as its lower end, and also moves more slowly than as though the fulcrums a were fixed. This loss in speed is compensated for by a gain in power, enabling the pitman to do more diflicult work than as though it were connected directly with the piston.
. I claim as my invention- The combination of the levers b b n a, connecting-rods t r r, and sliding-bars g g, with a suitable frame and supports, all arranged so as to forma connecting apparatus between the piston and pitman of a steam-engine, substantially as specified.
RICHARD S. EDWARDS.
Witnesses:
RANSOM SANBORN, SAMUEL 0. THOMPSON.
US123623D Improvement in the mode of connecting the piston and pitman of steam-engines Expired - Lifetime US123623A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608106A (en) * 1951-02-19 1952-08-26 J T Bond Rod line stroke control unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608106A (en) * 1951-02-19 1952-08-26 J T Bond Rod line stroke control unit

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