U. DE CRESCENZO.
APPLICATION FILED OCT. 16,1911. RENEWED JULY 25,1916.
Patented Nov 14, 1916.
3 SHEETS-:SHEET 1.
U. DE CRESCENZO.
APPLICATION FILED OCT. 16.19n. RENEWED JULY 25.1916.
' Patented Nov. 14, 1916.
3 SHEETS-SHEET 2.
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qlololv Wikmmeo STTS AE Specification of Letters Patent.
Patented Nov. 14, 1916.
Application filed October 16, 1911, Serial No. 654,913. Renewed July 25, 1916. Serial No. 111,277.
To all whom it may concern:
Be it known that I, UMBERTO DE Cens- CENZO, a subject of the King of Italy, residing at Boston, in the county of Sufiolk and State of Massachusetts, have invented certain new and useful Improvements in Mechanical Movements, of which the following is a specification.
This invention relates to a novel mechanical movement, and the object of my invention is to provide a simple mechanism for converting reciprocating into circular movement, or intermittent motion int-o rotary motion. 1
In a device of the character described it is important to provide means for accelerating the movement of the crank pins over the dead centers of the transmission wheel, and the agency employed is necessarily different where the wheel is driven by pedals connected to the cranks and partaking of circular motion, and where the pedals are not connected to the cranks directly but are carried by reciprocable I rods by which they are spaced some distance from the transmission wheel. To obtain ease in movement of the operating pedals in causing the cranks to be shifted over the dead center of the wheel, I have devised mechanism cooperating with the cranks, which is designed to act in time with the transmission Wheel in order to shift each pedal rod, at every quarter cycle of a corresponding crank in the same direction as said crank is moving. In this way the usual strain engendered by each crank in shifting the reciprocable rod cooperating therewith in its own direction of movement is relieved and is transferred to the wheel, but to neutralize this increased strain I have made the reciprocable pedal rods of such a length, from the pedals to the crank centers as will be effective to overcome the added friction when pressure is'applied to the pedals to set the cranks in motion.
In its broadest aspect my invention comprises the combination with means for re- .ciprocating oppositely arranged levers connected to tilting members of a driving'gear, a driven gear suitably setting in motion a cam cooperating with each reciprocating lever to impart ultimately to the driving gear a complete revolution at the same speed as the driving shaft.
With he above and further objects in view my invention comprises the combinat on, arrangement, and detalls of construction clearly shown in the drawings, and
then more particularly defined in the ap- I pended claims.
S mllar reference characters designate similar parts in the respective views where- 1n Figure 1 is'a side elevation of the mecha- I nism disclosing the novel mechanical movement, Fig. 2 is a side elevation thereof showing the pedal or treadle device for actuating the driving gear, Fig. 3 is a cross-sectional View on line w-m of Fig. 1 looking in the p direction of the arrows, and Fig. 4 is a rear elevation of said device looking in the direction oppositethe arrows.
The device to be described may be suitably mounted upon any bed plate or support according to the object that it is sought to subserve and according to the situation in which it is used. I show oppositely ar ranged standards, preferably tri-angular in shape, which are preferably formed of ribs of which 1 and 1 are, respectively, the base, and 4 and 4 the hypotenuse. The base members 1 and 1 are formed with projecting portions 2 and 2', respectively, upon which are mounted bearing blocks 3 and 3 carrying studs 5 and 5, respectively, for the transverse shaft 6 to which are pivoted at opposite ends the tilting levers 13 and 14 ,carrying each at its free end a roller 14 and 16. Secured upon the lower ends of the ribs 4 and 4 of the standards, by means vof legs 8 and 8 are suitable standards 7 and 7 carrying at their upper free ends a transverse shaft or spindle 9, upon which shaft.
brackets or standards 18 for a transverse.
shaft 20, carrying a central driving sprocket wheel 39 connected by sprocket chain 39 to driven sprocket wheel 10. Contiguous to sprocket wheel 89 is another sprocket wheel 21 controlled in movement by two oppoand 34 respectively, which are secured there-' to by bifurcated portions 35 and 38 respectively, at one end, and which are at their opposite ends pivotally connected to crank pins 36 and 36 respectively of the crank members 37 and 40 respectively, mounted upon the shaft 20 held in brackets 18 and 18.
From the large sprocket wheel 21 a sprocket chain 41 will lead to any suitable agency or machine for transmitting motion to the device.
Reference being had to Fig. 2 it is to be noted that each of the reciprocating members 22 and 24 are suitably braced or latticed to give it the desired strength and rigidity in operation and, as shown, bracing or truss members 29 are connected from each rod to a connecting tie rod 26 which is connected to an intermediate rod 27 which rod 27 is connected to each of the members 22 and 24 by a tie rod 28. It is important to note that the distance between the ends 23 and 23 of the members 22 and 24 from the pivotal point of connection therewith of the actuating rods 33 and 34 respectively, will be one-fourth the proportionate distance between the ends 23 and 23, 31 and 32, respectively. The ends 31 and 32 are shown connected to suitable pedals or similar members.
In operation the working-man or user will bring his foot into engagement with the pedals 31 and 32 of the reciprocating members 22 and 24 connected to the tilting levers 13 and 14 respectively. As shown clearly in Figs. 1 and 2, the pedals 31 and 32 will lie at different points in a vertical plane in which position they are substantially placed by virtue of the cam members 11 and 12 of which the member 11 normally bears against the roller 14 of the lever 13 to elevate the reciprocating member 22 carrying the pedal 31. hen the reciprocating members 22 and 24 are in the position stated it will be noticed that the crank members 37 pivotally connected to connecting rod 33 pivotally mounted upon reciprocating member 22 will project in a vertical plane above the shaft 20, while the opposite crank members 40 will be disposed below the shaft 20 in a diametrically opposite vertical plane to cooperate in depressing the reciprocating member 24 through its pivotal connection to connecting rod 34 pivotally mounted upon said member. It may be said that by reason of the relative positions of the cranks 37 and 40 they are located at diametrically opposite dead centers of sprocket wheel 21, driving the transmission gear of my device. If now the user depress the pedal 31 of reciprocating member 22, it will cause the crank 37 to exchange positions with the opposite crank 40, and complete a single revolution of the shaft 20. v
Each cam is, as shown, composed of two .lobes each of which is successively brought into engagement with the roller with which ithas contact to complete the reciprocation of the tilting lever which carries the roller.
It will be seen that one of the springs 17 will be normally held under tension due to the interengagement of the cam 11 and roller 14, while the other will beactive owing to the disengagement of the cam 12 on the roller 16.
It will be noticed that one of the cams will move into active position against the tension of a spring while the other is moving out of operative position under the relaxation of a spring, both cams acting in this manner during every quarter revolution of the sprocket wheel 10; this sprocket wheel obeys the movement of the sprocket wheel 39 mounted on shaft 20. The arrangement is such that when cam 11 moves to vertical position, cam 12 moves to horizontal position. When cam 11 moves to vertical position from horizontal position it is because crank 37 is moving from vertical to horizontal position, and rod 22 which has been depressed, will be shifted by link 13 in the direction of and in unison with the crank pin 36; similarly cam 12 will be instrumental in shifting lever 24 in the direction of the crank pin 36 of crank 40, as said crank lifts said rod. In this way when the cranks shall have exchanged positions so will the rods 22 and 24. The cams 11 and 12 will undergo now the same movements as before, but it will be noticed that when rod 24 is now depressed, the cam 12 will be caused to impel lever 14 against the tension of its spring, but this movement will be in the same rectilinear direction as crank pin 36 will be traveling. In other words'it is the office of the cams 12 and 11, and links 13 and 14, and the springs 17 to hold rods 22 and 24 in their proper relation, as well as to assist the cranks in shifting the rods 22 and 24 in conformity to the irregular paths of movement which they are caused to take and owing to the fact that the greater part of the length of each rod 22 and 24 is covered between the pedal of each rod and the pivotal point between the rod and one of the pitmen, but little force and pressure on the pedals will be needed to turn the cranks.
What I claim is:
- 1. A device of the character described comprising a frame, a shaft mounted above said frame, a transmission wheel on said shaft, two cranks mounted upon said shaft having wrist pins disposed at diametrically opposite points, two longitudinally extend .ing treadles normally disposed in a separated relation, pivots carried by said treadles and disposed at points substantially less than one-half the length of said treadles, pitmen movably connected at one end upon said pivots and connected at their opposite ends upon said wrist pins, a counter-shaft mounted on said frame in advance of said first-named shaft, a pair of two-lobed cams mounted upon said countershaft and being disposed in intersecting planes substantially at right angles to each other, a stud mounted upon said frame, two radial levers fulcrumed upon said stud at their inner ends, rollers journaled in the free ends of said levers, oppositely arranged brackets carried by said frame adjacent to said links, pivots carried by said radial levers intermediate their ends, said treadles being fulcrumed upon said last-named pivots at their inner ends, one lobe of one of said cams normally engaging the roller of one of said radial levers, the other cam being out of engagement with the roller of the other radial lever, and extensible springs carried by said brackets and secured to said radial levers to hold them normally in upright position, said cam-engaged lever having its spring put under tension and being obliquely disposed relatively to its mate link.
2. The described device consisting of a frame, a pair of treadles, rocking levers upon which said treadles are pivoted, said treadles being spring controlled, said levers being independently movable, and a pair of two lobed cams for actuating said levers.
3. The described device consisting of a frame, a pair of treadles, rocking levers upon which said treadles are pivoted, said treadles being spring controlled, said levers being independently movable, and a pair of two lobed cams for actuating said levers, the
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lobes of one of said cams being at right angles to the lobes of the other cam, and a shaft upon which said cams are fixedly mounted.
5. The described device consisting of a frame, a pair of treadles, rocking, levers upon which said treadles are pivoted, said treadles being spring controlled, said levers being independently movable, a pair of two lobed cams for actuating said levers, the lobes of one of said cams being at right angles to the lobes of the other cam, a shaft upon which said cams are fixedly mounted, a counter shaft, means for driving said counter shaft, and means whereby said counter shaft drives said first shaft.
6. The described device consisting of a frame, a pair of treadles, levers upon which said treadles are pivoted and cam wheels for actuating said levers, said cams having double actuating surfaces, said treadles being spring controlled.
7. The described device consisting of a frame, a pair of treadles, levers upon which said treadles are pivoted and cam wheels for actuating said levers, said cams having double actuating surfaces, said treadles being spring controlled, said levers being independently ,movable.
In testimony whereof I afiix my signature in presence of two witnesses.
UMBERTO DE ORESGENZO. Witnesses:
JOSEPH A. LANcoNE, JOSEPH E. LOMBARDI.
Washington, D. G.