US2350334A

US2350334A - Mechanical movement

Info

Publication number: US2350334A
Application number: US382005A
Authority: US
Inventors: Baker John Gordon
Original assignee: BAKER Manufacturing CO
Current assignee: Baker Manufacturing Co LLC
Priority date: 1941-03-06
Filing date: 1941-03-06
Publication date: 1944-06-06
Anticipated expiration: 1961-06-06

Description

June 6, 1944. J. G. BAKER MECHANICAL MOVEMENT Filed March e, 1941 2 Sheets-Shea?I l y@ dlTTO Blij/J June 6, 1944. J. G. BAKER MECHANICAL MOVEMENT Filed March 6, 1941 2 Sheets-Sheet 2 6 `l l/ l y ,4

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3,. 5 2 1 AW/ 3 w H 11; Tomsytj Patented June 6, 1944 MECHANICAL MOVEMENT f John Gordon Baker, Evansville, Wis., assignor to Baker Manufacturing Company, Evansville,

l Wis., a' corporation of Wisconsin Application March s, 1941, serial No. 382,005

8 -Claims.

This invention relates to mechanisms for converting rotary motion into reciprocatory motion and more particularly to such mechanism wherein the reciprocatory part is guided for rectilinear movement and the conversion is effected by a crank.

One object is to provide a mechanism of the above character in which the lines of action of the actuating and reactionary forces are located in a novel manner relative to the guide soas to minimize the bending stresses imposed on the latter. Y

Another object is to guide the reciprocatory part in a novel manner.

Other objects and advantages of the invention will become apparent from the following'detailed description taken in connection with the accompanying drawings, in which Figure l is a vertical sectional View through av power driven actuating mechanism involving the novel features of the present invention, the section being taken along the line I-I of Fig. 2.

Fig. 2 is a section taken along the line 2 2 of Fig. 1.

- While the invention is susceptible of various modifications and alternative constructions, I have shown in the drawings and will herein de scribe in detail the preferred embodiment. It is to *be understood, however, that I do not intend to limit the invention by such disclosure but aim to cover all modifications and alternative constructions falling Within the spirit and scope of the invention as expressed in the appended claims.

In the drawings, the invention is shown for purposes of illustration as a mechanism for converting rotary power derived, for example, from an electric motor 5 into reciprocatory motion and applying such motion to a driven member in the form of a rod 6 connected to a pump or other device to be reciprocated. The main operating parts are supported by a hollow casting 'l cooperating with a cover 8 to form a housing. The pump rodmay, if desired, be housed in an aux iliary cover 9. Herein, the motor is supported externally of the housing on a bracketv I and a pulley I'I on its shaft carries belts I2 driving a pulley I3 on the outer end of a shaft I4. The latter projects into the casing I and is journaled in bearings carried by opposite side walls 'Ia and 'Ib of the latter. v

The pump rod B is suspended at its upper end from a vertically movable arm or slide I disposed within the housing with its free end projecting through an opening I6 in the cover 8 and clamped between nuts Il on the rod. Therod ly shaped casting disposed horizontally within the housing and slidable along spaced guides I8 and I9 which extend parallel to the direction of reciprocation of the pumprod'.` Herein the guides take the form of vertical rods seated at their lower ends in bosses and 2I upstandingfrom the bottom wall of the casing 1. Intermediate their ends, the rods are guided through

lugs

22 and 23 cast integral with the walls of the casing 'I near the open end thereof. By virtue of their wide spacing and the support provided by the spaced bosses and lugs on the box-like casing, the guide surfaces are supported with extreme rigidity.

Holes are 4bored in opposite sides of the slide I5 to provide

bearing surfaces

24 and 25 to receive the upper ends ofthe rods I8 and I9. To increase lthe effective .length of Vthe guides, the

:coacting surfaces on the. slide are divided into two parts disposedon opposite sides of the lug with the slide extends downwardly past the lug 22 and has a `bored lower yend portion 21 received on andslidable along 'the larger rod I8 between its supporting boss 20 and the lug 22'. The spacing of the portion v2'I and the bearing surface 24 is approximately equal to that of the boss 20 vand the lugv 22 asa result `of which each pair of holes may be bored using a single tool set up. A substantial reduction in manufacturingcost is thus effected. Y

A crank mechanism is provided' for converting the rotary motion of thevshaft I4 into reciprocation of the slide I5.. To this end, a pinion v28` is carried by the shaft I41Within the casing and meshes with teeth 29 around the periphery of a larger gear 30 which is disposedv as close as possible to the casing wall l"` and therefore to the pump rod 6. For this purpose, the gear hub 3l is journaled on a stud 32 projecting inwardly from the casing wall and'preferably cast integral with this wall. A plate 32E fastened to the stud by screws 33 holds the gear on the stud.

A pitman 34 which connects the crank gear 30 to the slide intermediate the ends of the latter is especially constructed to ,provide for optimum lateral compactness of .the unit as a Whole and minimum lateral-spacing ofA the pump rod and line of action of the actuating force applied by the pitman. To these ends, the pitman is of generally U-shape with the closed end of the U projecting beyond the rod I8 toward the casing wall `'Ia as shown in Fig. 2. A A recess 35 in the under side of the slide receives the upper end portion of the pitman and the laterally extending end 36 is journaled in a bearing 31 supported in a cross-rib 38 on the slide, the bearing recess being closed by a cap 39. The lower end 4!) of the pitman constitutes the crank pin and is similarly constructed and mounted in a bearing 4I disposed in a hole 42 in the gear 30 and spaced from the gear axis to give the proper crank throw. The guide rod I9 is disposed closer to the casing wall 1a than the lrod I8 so as not to interfere with the rotation of the crank pin.

It will be observed that the line of action of the actuating force is in the plane of the crank gear and the bearings 31 and 4I 'and therefore` is disposed close to the casing wall 1b.

In the rotation of the crank gear, the slide I5 is alternately raised from the position shown and then lowered and the pump rod is moved correspondingly. This motion is lutilizedto actuate the piston 43 of 'a pump 44 and elevate oil from the reservoir, formed by the casing through a tube 45 from Vwhich-the oil is delivered to the actuated rod r6 enables the bending stresses :,f

exerted on the guides to be minimized. This is for the reason that with the lines of action of the oppositely directed actuating and reactionary forces disposed on the same side of the guides, Y

the bending moment exerted on the guides is determined solely by the differences in lengths of the moment arms of thetwo forces and is independent of the spacing of the force lines from the guides. actuating force applied by the crank is directed upwardly and generally parallel to the :guideways and in line with the .pitman bearings. a'ctionary force exerted by the pump is directed downwardly along the axis of the rod 5. During the downstroke, these directions are reversed. The moment arms yof these forces are the respective distances of the bearing v31. and the rod 5 from the 'guide rods I8 and I9 and, being on the 'same side Vof the rods, the resultant bending mo- -ment applied by the lslide tothe guides is the 'difference in lengths of the two rarms or the distance between the two force lines multiplied vby the actuating force. This effective .moment arm, and therefore the net bending stress, is reduced to a minimum in the present instance, the pitr'nan and the pump rod being disposed as close together as possible.

f I Vclaim as Amy invention:

l. Mechanism of the character described having, in combination with a reciprocable member to be'actuatcd, a hollow casing disposed adjacent said "member, 'a stud rigid with and projecting inwardly from the wall of said casing adjacent said member, a power driven gear rotatable on said stud, a guide rod *supported in said casing `on the side of said gear opposite said member and providing a guideway extending parallel to the path of said member, a slide Vreciprocable along said rod and projecting laterally Ythereof beyond said gear, means connecting the'projecting en'd of said slide to said vmember, fand a'U- shaped connecting rod 'with 'its closed -end projecting Vpast said rod and having lends Vextending `laterally toward said gear with one 'end .journaled in said gear eccentrically of the axis thereof and Thus, lon the upstroke, the y,

The rrethe other being pivotally connected to said slide intermediate said rods and the connection with said member.

2. Mechanism of the character described having, in combination with a reciprocable member to be actuated, a frame plate disposed adjacent and extending substantially parallel to said member, a power driven gear disposed close t0 the other side of said plate and supported therefrom to turn on an axis extending transversely of said member, a guideway mounted in said casing and spaced from said gear on the side thereof opposite said member, said guideway extending parallel to the path of the member, a

slide reciprocable along said rod and projecting laterallythereof beyond said gear, means con,- necting the projecting end of said slide to said member, and a connecting rod having one end journaled in said gear eccentrically of the axis thereof and the other being pivotally connected to said slide intermediate said rod and the connection with said member.

3. Mechanism of the character described having, in combination with a reciprocable member to be actuated, a power driven crank mounted adjacent said member for rotation in a plane parallel thereto, la pair of guide bars extending parallel to the path of said member and disposed in spaced relation t/o and on the side of said crank opposite said member, a slide reciprocable along said bars and projecting laterally thereof, means connecting the projecting end of said slide to said member, and a connecting rod disposed in the space between said bars and having one end pivotally connected to said crank and the other pivotally connected to said slide intermediate said bars and the connection with said member.

4. Mechanism of the 'character described ,having, in combination with a reciprocable member to be actuated, a -hollow casing disposed adjacent 'said member, va power driven crank mounted in said casing to rotate in a plane parallel to said member, a guide supported 'in said casing and spaced laterally from the 'path of reciprocation of said member and on the side of said crank opposite said member, a slide reciprocable along lsaid guide `and :projecting laterally thereof 'beyond said crank, ymeans connecting the projecting endof said vslide to said member, and aconnecting rod having one endjournaled in said `crank and the other end pivotally connected yto said slide intermediate said guide and the con- -nection with said member.

5. Mechanism ofthe characterk described having, in combination, a 'frame plate, an actuated lelement -disposed close -to -on'eside of said plate and reciprocable therealong,.apowerdriven crank gear rotatably supported on said ,pla-te closely adjacent the side thereof lopposite said element, a guide disposed yadjacentsaid gear on `the 'side thereof opposite said elementand extending jparallel to the path` of said element in laterally spaced relationrelative thereto, a slide projecting vlaterally from and Areciprocable along said guide Aand 'connected vat its -free end to said element, and a. pitman 'connecting said crank'gear and said slide intermediate the ends'oi 'the latter.

6. Mechanism of thecharacterdescrib'ed having, in combination, a slide, a guide supporting said slide for reciprocation, a power rotated crank ldisposed adjacent said -guide `andconnected by Aa, Vpitman to said slide -for -reciprocation of the latter `back and forth-along said guide, and anactuated element connected to said slide on the side of said crank and pitman opposite said guide.

7. Mechanism of the character described having, in combination, a slide, a guide supporting said slide for reciprocation, a power rotated crank connected to said slide for reciprocation of the latter back and forth along said guide, and an actuated element connected to said slide and reciprocated thereby, said element and the crank connection thereto being laterally spaced relative to said guide to locate the lines of the force application by said crank and the force reaction by said element on the same side of said guide and laterally spaced therefrom.

8. Mechanism of the character described having, in combination, a slide, a guide supporting said slide for reciprocation, a power reciprocated actuating element connected to said slide to move the latter back and forth along said guide, and an actuated element connected to said slide on the same side of said guide as said actuating element and reciprocated back and forth with the slide, said actuating and actuated elements being spaced from said guide on the same side of the latter and from each other whereby the actuating and reactionary bending moments exerted on said guide by these elements counteract each other.

JOHN GORDON BAKER.