Improved mechanical movement
US 81329 A
Description (OCR text may contain errors)
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Lena-8 Patent No. 81,329, ama August' 25, 186s.
IMPROVED MECHANICAL MOVEMENT.
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Be it known that I, JOHN S. BARDEN, of Providence, `in the county ofProvidence, and State of Rhode Island, have invented a new and improved Mechanical Movement, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making a part of this specification, in which- Figure l represents a front elevation of my invention.
Figure 2 is a transverse vertical section ofthe same, together with that of a modification of myinvention.
Figure 3 is an elevation, showing a. modification oi' my invention.
Figure 4 is a side elevation ofthe invention, including the modification.
The nature of my invention consists in the combination of an external and internal gear, with a rotating cam or eccentric in such a manner that upon the rotation of the eccentric a rotary motion will be imparted to one of the gears, while the other remains either entirely stationary or is held in sucha way as to be allowed a limited oscillating movement.
As the external gear is 'made to roll upon the internal gear, the relative rotary motion of the two will depend upon the diierence ofthe relative diameters Of the two pitch-lines.
If one of the gears be held and the eccentric be made toretate, the unconfined gear will have a slow motion around its own centre; if one of the gears be entirely stationary andthe other be actuated by the eccentric, it will be found that the movable gear will have a rotary motion on its own axis, in a direction opposite to that ofthe eccentric, and also a motion by which a portion of the gear-teeth will engage constantly and successively with a portion ofthe teeth ofthe stationary gear.
Referring to the drawingsa, in the several figures, represents an upright frame or standard.
6 is a large internal gear-cylinder, loosely supported on shaft s, and upon which it rotates.
c represents a smaller or'external gear-cylinder, su'pported upon and actuated by a cam or eccentric, fZ, secured to the shaft s. l l
The eccentric, d, is provided with friction-rollers,f, as shown in iig. 1, which bear upon the inner surface of the gear-cylinder c. v
To the gear-cylinder c is attached aber, e, extending downwards, and fitted snugly, but sons to have a free sliding movement, in a recess formed in a circular disk, g, which latter is fitted in a recess in the frame, and in which it's confined by means of a slat or cross-piece, so as to allow of a free partiallyrotary motion.
It will thus be seen that by rotating the eccentric, d, the smaller or external gear@ will be caused to engage constantly and successively with a portion of the teeth of the larger or interna-l gear, thus imparting to the latter a slow rotary motion on lits own axis.
The externalgear, c, is prevented from having a rot-ary movement by the bar e, which latter being confined in the recessed disk or circular plate g, is allowed a sliding motion in the same, the disk g moving on its centre to accommodate itself to the varying motion of the bar e.
Power may be applied to the larger or internal gear-cylinder to communicate motion to the external gear and its connections, or it may be applied directly to tite external gear, according to the required application of power or velocity.
The less the difference between the pitch-lines ot' the external and internal gears, the greater will be the power obtained, and the gear that snstains more directly the weight to be moved will have less tendency to move backwards.
It velocity is required, then sutlicient difference should be made between the diameters ofthe external and internal gears to allow the eccentric to move without taking any more power than is practically desirable.
The internal gear-cylinder may have an arm attached toit to prevent it .from rotating, and causing it to oscillate, in which case, the arm upon the external gear-cylinder should be dispensed with, to allow the latter t0 rotate. i
Fig. d represents a modification of my invention.
b is the stationary internal gear, and c the smaller or external gear, in thc central portion of which latter is ttcd, so as to move freely, a disk, ci', attached eecentrically to the shaft s, so that as the latter is rotated the eccentric, d', will impart to the gear c a rotary motion on its own axis, and at the same time cause it to engage successively and continuously with a portion ofthe teeth of the internal gear b.
g represents an abutment, which is held against the ge'ar c by means of a sliding bar or slab, e', actuated by a spring, z', secured to the base of the frame.
The abutment g is tted Vin the top ofthe slide e', and is allowed a free oscillating motion to accommodate itseli` to the motion of the gear c.. v The slide e is secured to the frame by means of a set-screw passing through a slot in the slide. What I claim as my invention, and desire to secure by Letters Patent, is- The combination-of an external and an internal gear with an eccentric, substantially as set forth. In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.
JOHN S. BARDEN.
JAMEs A. WooDBUnY, J. H. ADAMS.