US556550A - Mechanical movement - Google Patents

Description

(No Model.)

W. J. MGCORMICK.. MECHANICAL MOVEMENT.

No. 556,550, Patented Mar. 17,1896.

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VILLIALWI JOHN MCOORMIOK, OF MOUNT HOPE, VISOONSIN.

MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent N0. 556,550, dated March 17, 1896.

Application tiled September 3, 1895. Serial No. 561,331. (No model.)

To all whom t may concern:

Beit known that LWILLIAM JOHN MCCOR- MICK, a citizen of the United States, residing at Mount Hope, in the county of Grant and State of Wisconsin, have invented a new and useful Mechanical Movement, of which the following is a specification.

My invention relates to mechanical movements for converting rotary motion into reciprocating motion or vice versa and embraces a drive-wheel on a fixed center and a converting-wheel driven thereby and mounted on a center it is free to reciprocate and carries an operating-pitman for work. This convertingwheel is eccentrically hung on a swinging arm to permit of the above movement, and also carries on its central pivot one arm of an intermediately-fulcrumed lever, the other arm of which carries a counterbalance-weight so arranged as tolmove upwardly as the pitman moves down, and thereby store energy to assist in elevating the pitman. The arrangement is such that the downstroke of the pitman is rapid and the upstroke is slow, about three times as much time being required to raise the pitman as is required to lower it.

This movement is especially adapted to use in windmills and pump-jacks, or wherever a quick outstroke and a slow return stroke are required. In pumping this saves over the ordinary movement, economizes energy, and applies the greatest power on the upstroke, where it is needed to lift the water. It also economizes time, inasmuch as the lost time of the downstroke is minimized. Furthermore, the pitman being attached directly to the center of the converting-wheel and moving in a direct line the strain is more uniform and a lighter gear-wheel may be used than if the pitman were attached eccentrically, as is ordinarily the case.

Other advantages will appear from the detailed description.

In the drawings, Figure 1 is a perspective View of my mechanical movement. Fig. 2 is a vertical section longitudinally of the pitman. Fig. 3 is a transverse section in the line of the axes of the drive-wheel and converting-wheel. Fig. 4 presents two diagrammatic views showing the positions of parts with the pitman raised half-way and wholly raised.

Referring to the parts by numerals, 1 designates a suitable rectangular framework, consisting of a base 2, side posts 3 4 and headbar 5. About midway of post 3 power-shaft 6 is journaled in suitable journal-boxes 7. To power-shaft 6 is keyed or otherwise fixedly secured a drive-wheel 8 provided with radial teeth 9 arranged to mesh with corresponding teeth 1() in the periphery of converting-wheel 12. Converting-wheel-12 is loosely pivoted on the laterally-bent journal end or iiying pivot 13 of the swinging arm 14, which is loosely j ournaled at its farther end on powershaft 6 and retained in position thereon against journal-boxes 7 by means of a heavy Cotter 15 or by other suitable means. Converting-wheel l2 is provided transversely therethrough with a plurality of pivot-holes 1G at different distances, respectively, from the center. Depending in front of said wheel 12 is hanger 17 provided with an inturned end or supporting-pivot 1S which is loosely inserted in one of the pivot-holes 16, thereby regulating the length of vertical swing of wheel12 on arm 14 as it revolves about its eccentrieallylocated supporting pivot 13. Hanger 17 is bent at 19 into axial alignment with pivot end 13 and journaled in bearing 2O provided in head-bar 5 and bearing 21 provided in bracket 22. These two separated bearings are provided so as to give freedom and precision of movement and to give strength and rigidity for the purpose of receiving the lifting and driving strains from the pitman.

Pitman 23 is loosely supported at its upper end behind wheel 12 on journal end 13 of bar 14 and projects downwardly in alignment with bearings 2O 21 through guide-plate or keeper 24. Also pivoted to arm 14 on its journal end 13 and behind pitman 23 is counterbalance-lever 25, which is also pivoted at some intermediate point 2G to any suitable part of the frame, preferably to the powery shaft 6, and its outer free end is provided with a counterbalance-weight 27.

The rapid downstroke and slow return stroke are attained as follows: As the drivewheel 8 revolves over to the right, it turns the converting wheel 12 until the supportingpivot 18 is at the lowest point of the wheel 12 and the pitman 23 is raised to the limit of IOO its upward movement. As the drive-wheel 8 continues to rotate, it turns the wheel 12 so as to shorten the distance between the fulcrum-point 2G ofthe counterbalan ce-lever and the supporting-fulcrum 1S. This results in a rapid downward stroke of the pitn1an,where as when the support-in g-fulcrum 1 S reaches the other side of the wheel and is, therefore, upon the opposite side of the axis 13 from the fulerum-point 2G the upward movement of the axis 13, and hence ot' the pitman, is slow. In other words, the movement of the pitman is rapid when the supporting-fulcrum 1S of the converting-wheel is between the fulcrumpoints 2G and 13 and is slow when said ful- Crum-point 18 is arranged upon the opposite side oi' the fulcrum-point 13.

As au additional power-saver, I have provided counterbalance 27, which stores the energy of the wind or other source of power as the pitman is freely descending', and applies the same to aid in lifting the load as the pitman aseends. Of course, for some purposes it may be necessary to have a quick upstroke and a slow downstroke. rIhis may be had by reversing the drive-wheel; also, various speeds may be secured by making the drivewheel and converting-wheel of different sizes and these may be interchangeable; also, reciprocating motion may be converted into rotary motion. Other forms of gearing may be substituted for the cogs, as belt, sprocketchains, rbc. rllhe device may be used with or without the eounterbalance, and the counterbalance-lever may be extended beyond the converting-wheel.

I do not limit my device to use in windmills and pumps, as it is applicable to a large variety of other uses.

lVhen used in connection with a windmill, pitman is attached to the pump-rod, and the drive-rod from the wind-wheel is connected in any well-kn own manner, as by beveled gear-wheels, to power-shaft G, and the length of the stroke is regulated by adjusting supporting-pivot 18 in the required pivothole lo. i

Changes in the form, proportion, and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention.

lVhat I claim is- 1. A mechanical movement for converting motion, comprising a suitable frame, a drivewheel journaled on said frame, divergentlydisposed swinging arms pivoted at their remote ends, a converting-wheel geared to said drive-wheel and mounted centrally upon the movable end of one of the swingingarms, and also pivoted eceentrieally to the contiguous end of the second swinging arm, a pitman loosely connected to said first-named swinging arm, whereby the uniform rotary motion of said drive-wheel is converted into reciprocating motion in said pitman, one stroke of the latter being rapid and the other stroke slow, and eounterbalaneing devices for the pitman an d converting-wheel whereby energy is stored on one stroke of the pitman and expended on the other, all combined substantially as described.

2. A mechanical movement for converting motion, comprising a suitable frame, a drivewheel journaled on said frame, divergentlydisposed swinging arms pivoted at their remote ends, a converting-wheel geared to said drive-wheel and mounted centrally upon the movable end of one of the swinging arms, and also pivoted eccentrically to the contiguous end of the second swinging arm, and a pitman loosely connected to said iirst-named arm, whereby the uniform rotary motion of said drive-wheel is converted into reciprocating motion in said pitman, one stroke of the latter being rapid and the other stroke slow, and a counterbalaneelever having one oi' its arms suitably pivoted to said pitman, and having its other arm provided with a weight, whereby energy is stored on one stroke of said pitman and expended on the other stroke thereof, all combined substantially as described.

3. A mechanical movement for converting motion, comprising a suitable frame, a drivewheel journaled in said frame, divergentlydisposed swinging arms pivoted at their remote ends, a converting-wheel geared to said drive-wheel and provided with a plurality of pivot-holes at dierent distances from the center thereof, said converting-wheel being mounted centrally upon the movable end of one of the swinging arms, and pivoted eccentrically to the contiguous end of the second swinging arm by means of one of said pivotholes, a pitman loosely mounted on said 'firstnamed swinging arm, whereby the uniform rotary motion of said drive-wheel is converted into reciprocatory motion in said pitman, one stroke of the latter being rapid and the other stroke slow, and eounterbalancing devices for the pitman and converting-wheel to store energy on one stroke and expend it on the other stroke of the pitman, all combined substantially as described.

4. A mechanical movement for converting motion, comprising a suitable frame having a base-plate,a head-bar and a side post, a powershaft journaled in said side post, a drive-wheel keyed to said sha-ft, divergently-disposed swinging arms pivoted at their remote ends, a converting-wheel geared to said drive-wheel by means of intermeshing teeth and mounted centrally upon the outturned movable end of one of the swinging arms and pivoted eccentrically to the contiguous inturned end of the second swinging arm, the rst-named arm being loosely sleeved upon said power-shaft adjacent to the rear side of said post, and the second-named arm being pivoted in an extended bearing provided in said head-bar,said swinging arms being pivoted to swing over medial lines approximately at right angles to each other, a pitman loosely mounted at its upper end on said first-named swinging arm IOO IIO

weight,whereby energy is stored on one stroke of said pitman and expended on the other stroke thereof, all combined as and for the purpose described.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

VILLIAM JOHN MGCORMIOK. Vitnesses:

ANDREW CAIRNS, D. B. BRUNSON.

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