US34877A - Improvement in governor-connections for steam-engines - Google Patents

Description

UNITED STATES PATENT OFFICE..

TISDALE CARPENTER, OF PROVIDENCE, RHODE ISLAND.

IMPROVEMENT I'N GOVERNOR-CNNECTIONS FOR STEAM-ENGINES.

To @ZZ wil/0m it may concern:

Beit known that I, TIsDALE CARPENTER, of

Providence, in the county of Providence and State of Rhode Island, have invented a new i and useful Improvement in the lGovernor- Connections of Steam-Engines; and I do hereby declare that the following is'a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specication, in Which- Figures l and 2 are vertical sections at right angles to each other of a .governor-connection constructed according to my invention. Fig. 3 is a side view exhibiting the application of my` invention in combination with the governor and valvesot a steam-engine.

Similar letters of reference indicate corresponding part-s in the several figures.

This invention relates to the application of the governor to lengthen and shorten the arms ot rockinglevers, by which the induction or cut-off valves are worked, and thereby to cause the said levers to be capable of receiving from the cam or other device employed to impart motion to it from the main shaft of the engine a motion which is variable in such manner as to enable the valve to be closed at an earlier or later point in the stroke of the piston of the engine, as may be required to elect its proper regulation. It is more particularly applicable in connection with the compound cam and rocking levers which constitute part of the subject-matter of my Letters Patent No. 222, dated January 29,1861. Itconsists in a peculiar mode of effecting' the connection between the regulator and the shifting portions of the rocking levers, which provide for the lengthening and shortening of their arms, the object to be attained being to prevent any unsteadiness of the motion of the governor being produced in the shifting of the aforesaid portions of the lever.

To enable others skilled in the art to applyT my invention, I will proceed to describe it with reference to the drawings.

The example of the invention represented in the drawings is specially adapted by its construction and arrangement to operate in connection Wit-h the system of inductionvalves described in the specification of my aforesaid Letters Patent, a separate rockshaft A and rocking lever B being used for each induction-valve, and said rock-shafts and levers being arranged on opposite sides of the governor, as shown in Fig. 3. Each rock-shaft A works in bearings in a separate pair of standards C C, and each lever is made tubular, and has fitted to slide through `it a toothed rod D, which carries a friction-roller Working in contact with the valve-operating cam, said rod constituting the shifting portion of the rocking lever, which provides for the lengthening and shortening of that arm of the lever which derives mot-ion directly from the cam, and the teeth on the upperside of the said rod gearing with a toothed sector E, which oscillates upon fixed pins a ct, sup- Y ported in the standards A A above the rockshaft.

All the above-described parts are similar to those described in the specification of the aforesaid Letters Patent, except that 'the rockshaft of the valve-lever is supposed to be furnished with a separate arm for the attachment of the valve instead of having the valve attached directly to the part on which the sliding rod D works.

The toothed sector E, instead of being connected with the governor by means of alinkrod, as described in the specification of my aforesaid Letters Patent, has formed in its upper part a mortise b b for the reception of an upright rod F, which is attached by a screw thread and nuts to one of the two arms of a rigid yoke G, provided upon the sliding sleeve of the governor, and the said sector has Jformed init, on opposite sides of the said mortise and opposite each other, two similar curved slots O C, said slots passing entirely through the sides of the sector and communicating with the mortise Z9 b throughout their entire length. In the inner surface of each one of the pair of standards A A, at the sides of the sector E, there are formed upright parallel grooves el (Land attached to the lower end of the upright rod F there is a horizontal pin l, which passes through the slots c c and into the grooves d d, and the said pin is fitted within the slots c cwith friction-rollers c c, and within the grooves CZ CZ with square guideblocks f f, the said rollers fitting to the said slots and the said blocks to the grooves for the pu rpose ot' avoiding wear of the pin, slots,

I attached to the said rod, moves with its friction-rollers and guide-blocks up and down' the slots c c and grooves old, the said grooves keeping the rod upright, and their sides serv-V ing as bearings 'to support the pin against the lateral pressure it receivesffrom thesides of the slots c c and the pressure of the said pin being transmitted through the ,frictionrollers to act against the sides of the said grooves, moving the sector in one direction or the other, and so causing it to shift the rod D 'in one direction or the other, according as the governor rises and falls, and thereby causing the movement of the valve to be varied in a manner to bring the engine back to the requisite speed. i

In the above-described operation, owing to the angle formed by the intersection ofthe slots c c and grooves d cl being acute, -a very slight force applied to move the pin I in the direction of the grooves-that is to say, vertically-will exert a greater influence toward moving the sector than a more powerful force in a horizontal direction, and hence a slight retaining power attached to the governor-rod F will hold a stronger force acting to move the sliding rod D of the valve-lever 1engthwise. This enables the governor more easily to overcome any tendency of the sliding rod D to move in either direction longitudinally that may be produced by the irregular sur-v face of the valve-operating cam and so allows it (the governor) to perform its duty in a better'manner and without improper vibration.

I will remark that straight slots on the quadrant will admit of a similar operation "and eiect to lthose above described to be produced, -but that I prefer to make the slots curved, because it makes 'less variation in the angle between the slot and groove when the governor is raised or lowered than it would if the slots were strai ,gfht.'

What I claim as my invention, and desire to secure by Letters Patent, is-

Combining the governor-rod F or its equivalent With the toothed sector E, for operating the sliding rod or shifting portion D of the rocking lever of the valve-gear, by means of a pin I, attached to the said rod F or equivalent, a slot or slots c c inf the sector, and stationary grooves or guides d d, the whole applied and operating substantially as set forth.

TISDALE CARPENTER.

Witnesses: v

HENRY MARTIN, .L

EZRA D. Foce.

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