US2033906A - Wrist pin oiler and piston rod connecter - Google Patents

Description

March 17, 1936. c. ADLER WRIST PIN OILER AND PISTON ROD CONNECTER I Filed-March 14, 1935 larl fldler P s a Mar. '17, 1936 UNITED STATES wars'r PIN olLiza' AND PISTON Ron CONNECTER Carl Adler, Lorain, Ohio Application March 14, 1935, Serial No. 11,111

8 Claims. (01. 184-1) This invention relates to devices for oiling the wrist pins of pistons andconnecting the piston rods thereto while these parts are in the process of assembly at the manufacturing plant. At the present time, the method of oiling and connecting these parts in all automobile plants known to me is substantially as follows:

Oili-ng the wrist pin is accomplished by a workman who pulls the plstons out o'f the moving mol0 tors which are being carried along at a uniform v speed by a conveyor. fIhe workman places the pistons on his bench and then oils the wrist pins. To this end, he dips a rod into oil, sticks it against the end of the wrist pin and forcibly pushes out the wrist pinby this rod. The workman catches the pin as it comes. out of the piston. The pin is dipped into oil and then re-fitted into the piston. As the fit has only approximately a thousandth inch tolerance, it requires considerable accuracy the piston. The pin is pushed through one bushing of the piston and the piston then slid over to the next workman who picks up the connecting rod, puts it inside the piston and pushes the wrist pin into the hole of the connecting rod a little distance just sufficient to hold the rod and piston together. The piston is then thrown against a rubber plate, the wrist pin taking the force of the throw, and this pushes the pin inside the piston. This workman then slides the piston with the rod to the next workman who tightens therod on to the wrist pin and then the piston is passed on to the next workman who again tightens the wrist pin bolt a little, and this i workman also inspects the piston for nicks and to determine whether the'rod is tight on the wrist pin, etc. t

The general object of the present invention is to provide a machine for accomplishing this removal of the wrist pin from the piston, the oiling of the wrist pin at its bearings and the replacementof the wrist pin, the machine doing away .with the necessity of the steps previously describedand ,of using a number of workmenfor ac- .complishing. this purpose.

My-invention is illustrated in the accompanying drawing wherein: I

Figure 1 is an elevation of my machine partly broken away and showing in section a piston within the holder.

Figure .2 is a top plan view of the piston holder by itself.

Referring to the drawing, Ill designates a bench. Bolted to the bench is a U-shaped casting ll, that is, U-shaped in plan view as shown in Figon the part of the workman to fit the pin back into ure 2 and having its opposed portionsjust sufficiently separated as to receive in it and center a piston. The side portions of the casting I l have two opposed bores l2 and I3.

Both side walls of the casting II have outwardly projecting hubs l4 cast thereon or otherwise connected thereto, to form bearings for the rams which operate through the bores l2, these hearings l4 being, of course, bored to register with the bores l2 and I3. Operating within the bore I3 is a ram 15, which is engaged adjacent its outer'end by the fork I6 of a lever II. This lever is pivoted on bearing brackets l8, the lower end of this lever below'the pivot l9 being extended downward and laterally or to a position beneath the casting H. A spring 20 is attached to the lower end of this lever and retracts the lower end of this lever so as to cause the upper end of the lever to be urged toward the casting l I, which 'casting constitutes the cylinder holder. The

bearing openings l2 and I3 are provided with steel bushings or hearing sleeves 2|.

Operating through the bore l2, that is, through the bearing sleeve 2| thereof, is a ram 22 which is provided intermediate of its length with an annular groove for the reception of the forked end 23 of a lever 24. This lever is pivoted upon a pivot pin 25 carried by the bearing brackets 28 which are bolted to the bench, and the lower portion of the lever 24 extends downward and then laterally to a point adjacent ,the lower end of the lever IT. The free end of the lever 24 is. connected to a contractible spring 21 in turn connected to the bench in any suitable manner so that this spring 21 urges the lower end of the lever 24 upward and the forked end 23 outward away from the casting I l. The lower end of the lever 24 is provided with a depending portion 28 carrying a pedal 29 so that when the workman places his foot upon the pedal 29, the upper end of the lever 24 will be forced toward the casting II and will force the-ram 22 through the aperture l2 and toward the opposite side wall of the casting ll.

' The ram 22 has a longitudinally extending bore 30 which extendsfromthe rear end of the ram nearly to the forward end thereof and communicateswith the radial perforations 3| which open upon the exterior face of the ram. The rear end of the ram 22 is connected by a coupling 32 to an oil line pipe 33. This extends to an oil tank 34 which is preferably connected at its upper end to an air pressure line 35 having therein the pressure gauge 36 and the valve-31. The pipe 33 has therein the cut-oil valve 38. The upper end of the tank is provided, of course, with a filling opening and plug designated 39. I do not the bore 30 is a nipple 43 with a coupling 44.

whereby the nipple is connected to a flexible pipe 45 which extends to the left side of the mechanism, as shown in Figure 1-, and is connected by a coupling 46 to a nipple 41 and discharges into a passage 48 which in turn discharges into an annular chamber 49. The steel bushing 2| of this wall of the piston holder or casting II is provided with two or more sets of circumferentially disposed oil holes 50 forthe purpose of oiling the wrist pin of the piston as the latter is being forced out of the piston.

For the purpose of opening the valve 4| automatically as the ram 22 is advanced, I provide an angular pawl or valve actuating member 5| mounted upon the bench and having the form of a bell crank lever with its upwardly extending arm disposed in the path of movement of the valve arm 4|. The horizontal arm of this lever 5| cannot move downward beyond its horizontal position but the vertical arm of this bell crank levercan move rearward. This valve pawl or trip is yieldingly held in its normal position against the stop 52 by means of a spring 53. It will be seen that as the ram 22 is moved forward that at the proper time the valve arm 4| will engage with the upwardly extending arm of the valve actuating device and the valve arm 4| will be moved rearward to permit oil to be supplied to the bore 30 and ejected through the perforations 3|. As the ram moves further along, the arm 4| will pass the upwardly extending arm of the trip 5| and then the valve will be closed by the spring 42. Upon a reverse movement of the ram when the arm 4| contacts the upwardly extending arm of the trip 5|, this trip lever 5| will turn against the action of the spring 53' to permit the valve arm 4| to pass.

Depending from the bench and just above the lower end of the lever I1 is an angular detent 54 and attached to the lower end of the arm I! adjacent is extremity is a latch 55 angular in form, there being a spring 56 urging the latch in a direction to carry the beveled head 55a of the latch immediately beneath the angular horizontal portion of the detent 54. The pedal 29 is provided with a part 51 which normally extends beneath the horizontal portion or .arm of the latch 5|, so that when the lowerend of the lever 24 is raised by the spring 21, this trip member 51 will engage the latch 55 and release it from its engagement with the detent 54.

Attached to the bench is a member 58 having two opposed limiting stop screws 59. These screw stops 59 are adjustable through lugs 30 carried 'by the member 58 and thus adjustably' limit the movement of the lever 24.

The operation of this wrist pin oiler and rod connecter is as follows, it being understood that the left side bearing sleeve 2| is large enough in internal diameter to permit the wrist pin of the piston to clear the wall of the bearing, and it ,being also understood that the ram 22 on the right side must have a smaller diameter than the wrist pin in order to clear the bushing of the piston. The ram Hi can be allowed to project a little past the wall of the casting and then the piston would be slid in sideways to allow this ram to engage in the hole or recess in the end of the wrist pin or the ram I! may be urged outa or casting H with the ends of its wrist pin im- 10 mediately opposite the bores i 2 and I3, the op-- erator forces downward on the pedal 29. This forces the ram 22 inward, this ram being of such length and the lever 24 having such stroke, that the ram 22 is forced entirely across the opening it in the casting II and forces the wrist pin into the bore i3. This, of course, forces the ram i5 rearward against the action of the spring 23, and as this ram i5 is forced rearward, the lower end of the lever l1 moves upward and the latch head 30 5| engages over the angular detent 54, thus holding the ram IS in its retracted position. Upon the forward movement of the ram 22, the valve 43 is opened and oil, therefore, fiows out through the perforations 3|, oiling the right hand bearing 25 in the piston while at the same time oil is forced out through the apertures 50 in bearing sleeve 2| onto the wrist pin, thus oiling the entire length of the wrist pin. As soon as the lever 24 has reached the lower stop 59, the operator 30 knows that the wrist pin has" been forced fully outward and has been fully oiled and he releases the pressure upon the pedal 51. The spring 21 then draws the lower end of the lever 24 upward, As the pedal 29 moves the apertures 3| in the ram and the bearing on 45 the left hand side of the piston is oiled by lubricant applied to the wristpin itself through the apertures 50 in bushing 2|. When the lever 24 has struck the upper limiting stop 59, the wrist pin has been forced fully back into the piston 50 in its proper position. During 'the operation above described, the operator picks up the con necting rod and when the wrist pin has been fully forced into the opposite hub by the ram 22 and after the ram 22 has been sumciently re- 55 tracted, the connecting rod is put in position inside the piston, then the left hand lever is released by the trip 51 and forces the wrist pin back into position, as before described.

It will be understoodthat in the operation of w this mechanism oil is spurted out through the perforations 3| and perforations 50 when the valve arm 4| strikes the trip 5|, and only during this period. As soon as the valve arm is past the trip, the valve 40 closes and remains closed, 5

therefore, for only a portion of the travel of the wrist pin is the oil spurted out. This oil spurts out as soon as the perforations 3| are opposite the right hand bushing of the piston. At this moment, the middle portion of the pin is in reg- 70 ister with the openings 50 and oil is spurted out upon the middle portion of the pin. Upon the reverse movement, this pin is carried back and the oil on the middle portion of the pin is wiped off by the bushing in the piston and thus the 76 aosaooe remainder of the pin becomes oiled. There is, therefore, oil on the middle of the pin and oil on the left hand sideof the pm when the pin has returned to the position shown in Figure 1, while the right hand end of the pin has been oiled by the oil on the right hand bushing.

While I have illustrated a construction in'which the pin B is only shifted to a position with the a single operator is enabled to remove the wrist' pin from the piston, oil it, put the connecting rod in position and again project the wrist pin into proper place within the piston, thus doing away with the necessity of using three or four .25 operations for this purpose with thecorresponding workmen. Of course, it is obvious that a valve may be connected in the 011 line which will control the amount of oil'feed at each opening of the valve 40 so that only the proper and requisite amount of oil may be applied to the wrist pin. at each operation of the machine.

I have illustrated a piston A disposed within the piston holder or casting l I and I have shown for the purpose of elevating this'piston to ex actly the proper height for the rams to' operate upon the wrist pin B, several piston rings, shims or like elements designated C, which may be dis posed upon the bench, thus making the device adaptable to pistons of different lengths.

While I have illlustrated certain details of construction and the desired arrangement of parts, I do not wish to be limited thereto except as defined in the appended claims, as many minor changes may be made from the lay-out illustrated and described without departing from the spirit of the invention as defined in the appended claims. 7

What is claimed is:

1. A wrist pin inserting and piston rod connecting mechanism including a piston holder formed to receive a piston and having opposed bores adapted to register with the wrist pin openings of the piston, opposed rams movable through said bores and means for forcing one ram inward to force the wrist pin through the wall of the piston .and into the opposite bore containingthe other ram and force this last named ram out ward and successively retracting this first named ram while holding the second named ram from.

projection and then projecting the second named ram to force the wrist pin inward into its normal position in the piston.

2. A wrist pin oiling and piston rod connecting mechanism including a holder formed to receive a I piston and having opposed bores adapted to register with the wrist pin openings of the piston, opposed rams movable through said bores, one of said rams having an oil containing chamber having perforations opening on the peripheral face of the ram and adapted to oil the wrist pin hearing of the piston as the ram passes therethrough, the wall surrounding the opposed bore for the other ram having oil inlet openings connected to a source of oil, and cans for forcing the first named ram inward to force the wrist pin through for a predetermined time o the wallet the piston and into the bore containing the second named ram and thus force the 7 second named ram outward to thereby uncover the oil openings therein to thus oil' the wrist pin and successively retracting the first named ram while holding the second named mm from' projection andthen projecting the second named ram to return the oiled wrist pin to its normal piston, opposed rams movable through said bores,

one of said rams having an oil containing chamber, the chamber having perforations opening on the peripheral face of the ram, an oil inlet pipe conducting .oil into said chamber, an oil pipe leading from said chamber in thefirst named ram, the wall surrounding the opposed bore having oil inlet openings with which said second named pipe communicates, and means for forcing the first named ram inward to force the wrist pin through the wall of the piston and into the bore containing the second named ram and thus forcethe second named ram outward to thereby uncover the oil openings therein and thus oil the wrist pin and successively retracting the first named ram while holding the second named ram from projection and then projecting the second named ram to return the oiled wrist pin to its normal position in the piston. y

, 4. A wrist pin oiling and piston rod connecting mechanism including a holder formed to receive a piston and having opposed bores adapted to register with the wrist pin openings in the piston, opposed rams movable through said bores, one of said rams having an oil containing chamber, the chamber having perforations opening on the peripheral face of the ram, an oil inlet pipe conducting oil into said chamber, an oil pipe ing oil inlet openings with which said second named pipe communicates, means for forcing the first named ram inward to force the wrist pin through the piston wall and into the bore containing the opposed ram and thus force the last named ram outward to thereby uncover the oil openings therein and oil the wrist pin and successively retracting the first named ram while holding the second named ram from projection and then projecting the second named ram to return the oiled wrist pin to its normal position in the piston, and means for automatically opening communication between the chamber in the first named ram and tLn oii supply pipe thereto the forwai d movement of the second named ram. 5. A wrist pin inserting and piston rod connecting mechanism including a holder formed to receivea piston and having opposed bores adapted to register with the wrist pin openings of the piston, opposed rams movable through said bores, levers operatively connected to said rams at one end, one of said levers having a pedal whereby it may be depressed and the ram projected, means connected to the other lever for urging said lever in a direction to project its ram, means acting when the last named ram has been pushed outward by a. wrist pin shifted by the action of the first named ram to hold the second named ram from projection under the action of its 7 ram to its retracted position to automatically release the lever of the second named ram to permit this ram to be projected and the wrist pin returned to its normal position in the piston.

6. A wrist pin inserting and piston rod connecting mechanism including a holder formed to receive a piston and having opposed bores adapted to register with the wrist pin openings of the piston, opposed rams movable through said bores, levers operatively connected to said rams at one end, one of said levers having a pedal whereby it may be depressed and the ram projected, means urging the ram to its retracted position, means connected to the other lever for urging said lever in a direction to project its ram, means acting when the last named ram has been pushed outward by a wrist pin shifted by the action of the first named ram to hold the second named ram 'from projection under the action of its urging means, said means including a latch pivotally mounted upon the lever of the second named ram, a fixed keeper with which said latch is adapted to engage when the lever has been shifted to a position fully retracting the ram attached thereto, and means carried by the lever of the first named ram adapted to release said latch when the lever of the first named ram has been returned to its initial position.

7. A wrist pin oiling and piston rod connecting mechanism including a holder formed to receive a piston and having opposed bores adapted to register with the wrist pin openings of the piston, opposed rams movable through said bores, means for projecting one of said rams through its bore to force a wrist pin from the piston and simultaneously force out the opposed ram, means for oiling the bearing in the piston from which the wrist pin has been forced out and oiling the wrist pin as it is forced past the opposed bearing in the piston, means for retracting the first named ram and retaining the second named ram in its retracted position, and means successively acting to release the second named ram to permit it to return the wrist pin to its initial position.

8. A wrist pin oiling and piston rod connecting mechanism including a holder formed to receive a piston and having opposed bores adapted to register with the wrist pin openings of the piston, opposed rams movable through said bores, one of said rams having an oil containing chamber, the chamber having perforations opening on the peripheral face of the ram, an oil supply chamber containing oil under fluid pressure and connected to the chamber of the ram, the wall surrounding the opposed bore for the other ram having oil inlet openings and a tubular connection connecting said inlet openings with the oil containing chamber, a valve in said connection between the oil supply chamber and the oil containing chamber, the valve being carried by the first named ram and having an arm, the valve being urged to a closed position, means disposed in the path of movement of the valve arm and adapted to shift the valve arm to move the valve into open position until the valve arm has passed said means, said means being constructed to permit the reverse movement of the valve arm without affecting the valve, and manually operable means for forcing the first named ram inward to force the wrist pin through the wall of the piston and into the bore containing the second named ram to thereby force the second named ram outward, said means successively retracting the first named ram while retaining the second named ram from projection and then releasing the second named ram to permit it to return the wrist pin to its normal position in the piston.

, CARL ADLER.

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