US2477589A - Control device with adjustable stop - Google Patents

Description

Aug. 2, 1949. w. H. DU SHANE 2,477,539

CONTROL DEVICE WITH ADJUSTABLE STOP Filed Aug. 21, 1948 INVENTOR. WALLACE/i DUSHAN Patented Aug. 2, 1949 CONTROL DEVICE WITH ADJUSTABLE STOP Wallace H. Du Shane, Waterloo, Iowa, assignor to Deere Manufacturing 00., Dubuque, Iowa, a

corporation of Iowa Application August 21, 1948, Serial No. 45,495

10 Claims. 1

This invention relates to a control device, and more particularly to means providing adjustable stops for defining or determining different limits of movement of a movable part of the device.

The invention finds particular utility in the speed control means for 2. Diesel engine, for example. In the case of a tractor or industrial equipment powered by a Diesel engine, it is desirable to provide a speed-governing lever which is manually movable to establish for the engine a wide speed range between a slow idle limit and a high limit; and, as a matter of convenience to the operator, it is desirable to provide a stop beyond which the control lever cannot be moved so that the operator cannot inadvertently cut 011" the engine by moving the control lever past the slow idle position. At the same time, however, provision must be made for cutting 01f the fuel supply to the engine by the same control lever. Accordingly, the present invention provides a stop which is adjustable to the extent that normally it serves to prevent inadvertent movement of the speed-governing lever below the slow idle position but which is shiftable to present a secondary stop which determines the position of the lever in that position thereof in which it effects stopping of the engine. The arrangement is particularly useful in a Diesel engine, since such engine has no electrical ignition system which can be cut out or grounded when it is desired to stop the engine; however, the device is not limited in its applicability to Diesel engines and may be otherwise applied, as will be apparent to those versed in the art as the disclosure progresses.

An important object of the invention is to utilize the adjustable stop means in a control device of the type in which a plurality of members having cooperating radial faces are spring pressed into frictional engagement to provide means for maintaining a control lever or the like in any one of several positions between the maximum positions permitted by the stop means. In such device, it is a feature to provide a plate rockable about an axis and having a notch extending angularly therein with respect to the rocking axis so as to provide a pair of edges spaced apart angularly. A stop member extends into the notch and has opposite side portions which are engageable by one or the other of the edges of the notch to limit angular movement of the plate or member. The stop element is displaceable with respect to the plate to dispose a portion thereof of reduced diameter in the notch so that the range of angular movement of the plate may be increased. The plate constitutes one of a plurality of friction members, and another is a fiat member associated with the plate and frictionally engageable therewith. The flat member is loose or non-rotatable with respect to the plate and has an aperture which is engaged by a portion of the stop element so that the fiat member cannot rotate with the plate.

Other objects of the invention include the provision of z a control device of simple and inexpensive construction in the form of a casing which is completely enclosed and which houses the friction means and the stop means; a control device comprising relatively few parts; and a device that may be readily adapted to the control of Diesel engines, for example.

The foregoing and other important objects and desirable features inherent in and encompassed by the invention will become apparent as a preferred embodiment of the invention is fully disclosed in the following detailed description and accompanying sheet of drawings in which:

Figure 1 is a side elevational view of the control device, showing its general external appearance;

Figure 2 is a sectional view on the line 2-2 of Figure 1;

Figure 3 is a sectional View on the line 33 of Figure 2, illustrating in dot-dash lines a secondary position of the control lever; and

Figure 4 is a detail view of the cover for the casing, as viewed from its internal face.

The control device illustrated is based on a preferred design in which the main support for the parts to be hereinafter described comprises a casing l0 provided with a substantially hollow interior which opens at one side through a circular opening H. The supporting structure may be otherwise constructed, according to the particular requirements in any given case. The details set forth here are preferred but should not be taken as limiting the applicability of the invention.

The circular opening II is normally closed by a removable cover I2 which is generally circular in shape but having a pair of diametrically opposed apertured ears l3 through which cap screws M may be passed to secure the cover to the casing ID. The interior of the casing is provided with a boss l5 which is recessed by a bore IS with which communicates a reduced counterbore l1. The counterbore ll provides a bearin for carrying a rockshaft Hi. The rockshaft extends completely through the casing I0 and into a bore or recess I9 which is provided in the cover [2 to receive the inner end of the rockshaft. That portion of the rockshaft that is external to the easing is connected to a control lever so that the rockshaft may be manually rocked. The connection between the rockshaft l8 and lever 20 may comprise a pin 2 I.

The lever 2!] is connected by means of the rockshaft l8 to a movable, member here. shown as taking the form of a; plate or diskr 22rwhichzmay be fixed to the rockshaft l8 as by Welding at 23' (Figure 2). periphery to receive the bent end of a control rod" 24 which may extend to speedcontrol mechanism:

or other controllable devices. If used ona Diesel engine, for example, the control rod will extend to the governor for the engine: Substantially diametrically opposite the connection with the rod 24, the plate or disk 22 is formed-.withaanotch;

25 which extends angularly as respects, the axis. of the rockshaft IS, the notch thus bein provided with a pair of angularly spaced apart stop edges 26 and 21, each on a radius through the rockshaft'axis.

The cover l2"is drilled. on an axis parallelt'o the rockshaft axis l8, as at 28-, for the. purpose of carrying a: stop element designated generally by the numeral 29' (Figure 2). This element preferably takes theform of a pin'havinga cylindrical stem 30 and an enlarged circular: head 3!; The diameter of the head 3| is substantially larger than that of? the stem- 31 but is smaller than the angular distance betweenthe edges 26 and 2'! on thedisk or plate 2.2: When the stop elementZBisin. the position shown in Figure 2', and in the position shown in: full lines in Figure 3; the head 3! is in the notch: 255 between the stop edges 25 and Hand thus providesarr-abuts ment to be engaged by one or'the' other: of the stopedges, For example; if'the control: lever" is rocked; in a i counterclockwise direction, as:viewed in Figure 3, the stop edge 26' will engage the i head of the pin or elementz29r If the: control lever ZB'is rocked. in theoppositedirecti'orr, the edge 21 may engage the oppositeside: of. the head 31' of the pin or element; In the present-adaptationof the invention to: the control of a Diesel engine, the position of the lever 29 in which. the edge 26 engages the head-31hr: the pinr29;.determines: the slow idle speedt-of'theengine; thatis, a speed at: which. the engine, will: turrr over smoothly without load; for example; 60.0 R; P: M. The position of; the; lever 2B1in1Whithz-the edge 2;!" engages the opposite side of the head 3:11 of the pin' may determine a: speed: at which; the engine turns: over: at; say,. 9.60; to: l' l'ofi Rz 1?; M; Thus, it will! be seen; that the: control: lever has a wide range of. angular-movement; for' deterrmiming two difierent' operating? speeds of the engine a'ccordingto the limits imposemby'thestop means comprising the; head 31 and. step edges; 25 and 2:1. Normally; the lever Zitcannotbe. moved in a: counterclockwise: directiontbeyomr the engagement between the edge 25 and head 3|. of the pint 29; and hence the operator cannot inadvertently'cut oiT operation of: the engine:

According to the present invention; thestop' element or pin 29 isz shift'able: at; the: will; oti the operator to provide forincreasing the: angular movement of the control lever 20,-. at least in a. counterclockwise directiom, so that the? operator may move the, lever 20; to-- the: dot-dash position oi Figure 3, which position corresponds to. a. condition in which; operation. of: the engine is; discontinued; For this: purpose, thepinaZQ isshiftable: axially inwardly against a. compression spring: 32whiclris1sea-tedina bone: or, recess 33:

The plate is apertured adjacent its,

in the support or casing 10. The spring 32 serves to maintain the pin or element 29 in its normal position, which is the position shown in Figure 2. In this position, the right hand end of the stem 33 extends exteriorly of the cover [2 to provide a portion that is available for manual control, which.c.ontrol.is, of course,. accomplished by depressing the pin inwardly: Shifting-i or depressing of the pin inwardly moves the head 3| out of the notch 25 and thus presents the relatively smaller diameter of the stem 30 as an abutment iii-the path. ofeither'of the edges 26 or 21, primarily the edge 26. The operator, then, by holdingjthe pin 23. in its inwardly depressed position, may moverthe control lever 20 in a counterclockwise direction to the dot-dash line position shown in: Figure 3, whereupon the plate 22 will move angularlytan increased distance until the edge 26 encounters or stops against the stem 30. With the parts in this position, the operator may. release the pin 29; but it will be held" in its inner position because of engagement of the head" 31 with' theportion'of the plate or disk'22 bordering on the edge 26, as will be obvious from Figure 3.

Another feature-of the invention" resides in the means for frictionally controlling various posi tions ofthecontrol lever between the positive-positions definedbythe stop mean-s described 'ab'ove'. Accordingly, the interior-surface of the cover' I2 is provided with a radial face 34" which is generally in the form ofan are about" the r-ockshaft axis. The arcuate radial face- 34 is interrupted at 35 toprovide space for the end of the control rod 24. This detail is relatively unimportant, it being necessary only'that the arcuate' extent of the face 34 be suflicient to accommodate the-range of" angular movement of the disk 221 The disk 22, being a flat plate; has oppositeradial faces; one of whichfrictionally contacts theradial face 34 on the cover [2. In" the present construction, the disk 22 is-formedof sheetmet'al; although a difierent material may be selected, if desired: The plate or disk 22-is held in frictional contact with the face 34- on the cover i2 by means of" a Hat member'36 and a compression spring 31-. The general configuration of the flat member St is shown in-Figure3. This member is looseon' the rockshaft I8' and is interposed between theboss I-5'- and the inner radia-l-face'of the plate'or disk 22. The member thus loosely depends fromthe rockshaf-t I8 andis providedwith acircular aperture 38 which receives a portion-of thehead' 31- ofthe-pin-orstop element 29: The head 3lof the pi'nthus-holds the member 36 against rotation with the rockshaft l8 or plate 22. Thespri'ng 37 isreoeived i'n the bore-or recess lfi inthecasing I0 and exerts a force against the member 363 which in turn is: transferred to the plate 22 and thence to-the' cover l2. The-member 36- is preferably formed or sheet metai; as-i'sthe-plate 22-, but may be formed of" different material, if desired; The pressure of the spring 37" is sumcient to hold the plate or disk 22" 'in any; one of its adjusted positions against ordinary vibration incident to: the operation of the equipment with which the control device isused"; yet, the fric tional engagement between the-parts is suchas to permit the control lever Zl'lto be easily and smoothly moved from one positiozrto another.

That portion of the boss l5orr theinterior" of the casing: I0 which is in proximity t'e-thelieati 31' of the pin 29 1s so-arrange'd as -to providea limit: to inward movement of the pin. That is to; say, depressing'of the pin 29 inwardly will re"- sultiimmoving: the head 31 outof the path of able is greater than the thickness of the plate 22 but less than the thickness of the member 36.

Features of the invention other than those specifically pointed out above will undoubtedly occur to those skilled in the art, as will numerous modifications and alterations, all of which may be achieved without departing from the spirit and scope of the invention as defined in the appended claims.

What is claimed is:

1. A control device, comprising: a casing; a rockshaft carried by the casing; a cover for the casing including a recess receiving an end portion of the rockshaft; means on the interior of the cover providing a generally flat face radial to the rockshaft axis; a plate fixed to the rockshaft within the casing and having opposite radial faces, one of which contacts the cover face; a fiat member loose on the rockshaft and having opposite radial faces, one of which contacts the other plate face; spring means between the casing and the other face of the flat member for pressing said member frictionally against the plate and the plate frictionally against the cover face; means on the plate providing a notch extending angularly as respects the rockshaft axis to provide a pair of edges spaced angularly apart; a stop pin carried by the cover for shifting along an axis parallel to the rockshaft axis and having a generally cylindrical stem extending through the cover to the exterior thereof, said pin having a generally circular exterior portion of the stem to move the head out of and the stem into the notch in the plate to provide a second abutment, one of said edges to limit the angular movement of the plate to a greater range; means providing an aperture in the fiat member for receiving a portion of the head of the pin in either position of the pin so that the head holds the flat member against turning with the rockshaft; and biasing means operative between the casing and the pin to yieldably hold the pin in and return the pin to its normal position.

2. A control device, comprising: a support; a rockshaft carried by the support; means on the support providing a generally flat face radial to the rockshaft axis; a plate fixed to the rockshaft and having opposite radial faces, one of which contacts the cover face; a flat member loose on the rockshaft and having opposite radial faces, one of which contacts the other plate face; spring means between the support and the other face of the flat member for pressing said member frictionally against the plate and the plate frictionally against the support face; means on the plate providing a notch extending angularly as respects the rockshaft axis to provide a pair of edges spaced angularly apart; a stop pin carried by the support for shifting along an axis parallel to the rockshaft axis and having a generally cylindrical stem including at one end a manually engageable portion and at its other end a generally circular head of a diameter greater than that of the stem but less than the angularspacing between said edges on the plate and normally disposed with the head in the notch and constituting an abutment to be engaged by at least on of said edges to limit angular movement of the plate to a predetermined range, said pin being shiftable via pressure on the aforesaid stem portion to move the head out of and the stem into the notch in the plate to provide a second abutment, one of said edges to limit the angular movement of the plate to a greater range; means providing an aperture in the flat member for receiving a portion of the head of the pin in at least one position of the pin so that the head holds the fiat member against turning with the rockshaft; and biasing means operative between the support and the pin to yieldably hold. the pin in and return the pin to its normal position.

3. The invention defined in claim 2, further characterized in that: means is provided to limit shifting of the pin to an extent such that the head remains within the aperture in the flat member in either position of the pin.

4. A control device, comprising: a support; a rockshaft carried by the support; means on the support providing a generally flat face radial to the rockshaft axis; a plate fixed to the rockshaft and having opposite radial faces, one of which contacts the cover face; a flat member loose on the rockshaft and having opposite radial faces, one of which contacts the other plate face; spring means between the support and the other face of the fiat member for pressing said member frictio-nally against the plate and the plate frictionally against the support face; means on the plate providing a notch extending angularly as respects the rockshaft axis to provide a pair of edges spaced angularly apart; and means carried by the support and extending through the notch to provide an abutment engageable by at least one of the stop edges on the plate for limiting angular movement of the plate.

5. A control device, comprising: a support; a rockshaft carried by the support; means on the support providing a generally fiat face radial to the rockshaft axis; a plate fixed to the rockshaft and having opposite radial faces, one of which contacts the cover face; a flat member loose on the rockshaft and having opposite radial faces, one of which contacts the other plate face; spring means between the support and the other face of the flat member for pressing said member frictionally against the plate and the plate frictionally against the support face; means on the plate providing a notch extending angularly as respects the rockshaft axis to provide a pair of edges spaced angularly apart; and means carried by the support and extendin through the notch to provide an abutment engageable by at least one of the stop edges on the plate for limiting angular movement of the plate, said means including a portion engaging the flat member to hold said member against turning with either the rockshaft or plate.

6. A control device, comprising: a support; a rockshaft carried by the support; means on the support providing a generally fiat face radial to the rockshaft axis; a plate fixed to the rockshaft and having opposite radial faces, one of which contacts the cover face; a fiat member loose on the rockshaft and having opposite radial faces, one of which contacts the other plate face; spring 1 means betWeenthe support a and a the other face lof the-fiatmember for pressing-said member fric- -tionally--agai-nstthe plate and the plate frictionally-againstthesupport face; means on-theplate providing a notch extending angularly as re- -spects-the rockshaft axisto provide a-pair of -edges spaced angularly apart; and means carried *by'the support for selective positioning with respect to the plate and support and having a plurality of stop portions of different sizes selectively l rprojectable into the notch and between-the stop edges .to present optional abutmentsfor; limiting angular movement of the plate to different @theiflat member for pressing said member frictionally against the plate and theplate frictionally against the supportface; meansonlthe plate providing a notch extending angularly as respects the rockshaft axis to provide .a pair of edges spaced angularly apartyand means carried by the support for selectivepositioning with respect-to .the. plate and support and-having apluralityof stop. portions of different sizes selectively project- ..ableintothe notch and between the stop edges topresent optional abutments for limiting angular movementof the plate to different ranges, said means-including a portion engageable with the fiat member in any position of said means to .hold said member against turning with either the rockshaft or plate.

:8. In a control device including a support and samember carried thereby-for rocking about {an axis: means on'the'member providing a pairof stops spaced angularly apart aboutthe aforesaid axis and extending generally-radially:to provide a space between said stops; a limiting element shiftable between first and second positions along a path generally parallel to said .axis and through the space between said stops, :saidelement having first and secondportions,'thezfirst portion being of a larger dimension than :the .other transverse to .the path of shifting of said element but smaller than the angular distance between said stops, said elementin one'position thereof presenting the first portion as-an-abutment to the stops to limit angular movement of said member to a certain number of degrees, and said element in another position thereof presenting the second portion as an abutmentto the stops to limit angular movement of thememberto a different number of degrees; and means biasing said element to one of its positions and providing for shifting of the element to its other position.

9. In a control device including a support and a member movable thereon in oppositedirections along a defined path: means on the member pro viding a pair of stops spaced apart along the path of movement of the member; and a stop element carried by the support for selective movement between two positions with respect thereto and with-respect to the member and havingafirst portion normally interposed, in one position of the element, between the stops and engageable by the stops to limit movement of the member in opposite directions, said element having a second portion of different dimensions .than .the .first portion as'respects the spacing between the stops and positionable, in the otherposition of theelement, between the stops to establish different limits on the movement of the member in opposite directions.

10. In a control device includinga support and a member movable thereon in opposite directions along a defined path; meansprovidinga stop on the member; and a stop element carried by the support for selective movement between two positions with respect thereto and with respect to the member and having a first portionnormally interposed, in one position of the element in the path of the stop on the member to limit movement of the member in one direction, said element having a second portion of difierent .dimensions than the first portion as respects the path of movement of the stop on the member and positionable, in the other position of the element in the path of the stop to establish a different'limit on movement of the member in said one direction.

WALLACE H. .DU SHANE.

No references cited.

Images