US1847789A - Machine for rebabbitting bearings - Google Patents

Description

March 1, 1932. STAFF 1,847,789

MACHINE FOR REBABBITTING BEARINGS Filed Aug. 2, 1930 2 Sheets-Sheet 1 i L well did p March 1, 1932. STAFF 1,847,789

MACHINE FOR REBABBITTING BEARINGS Filed Aug. 2, 1950 2 Sheets-Sheet 2 g A will x WN i I 0 zowez, Jill/(f.

Patented Mar. 1, 1932 PATENT ()FFICE LOWELL STAFF, F AMARILLO, TEXAS MACHINE FOR REBABBITTING BEARINGS Application filed August 2, 1930. Serial No. 472,711.

This invention has for its principal object the provision of simple, efficient and easily manipulated means whereby the rebabbitting of connecting rods and other bearings may be expeditiously accomplished. The invention seeks to provide a mechanism which may be easily operated by a single workman and by the use of which the bushing of Babbitt metal in the bearing or connecting rods and other devices may be renewed with minimum labor and at a low cost. The invention is illustrated in the accompanying drawings and will be hereinafter fully set forth.

In the drawings:

Figure 1 is a perspective view of an apparatus embodying the invention,

Fig. 2 is a central vertical section of the same,

Fig. 3 is a rear elevation,

Fig. 4 is a horizontal section on the line 44 of Fig. 2, and

Fig. 5 is a detail section through a portion of a connecting rod showing a new bushing therein.

In carrying out the present invention, there is provided a base plate or standard 1 havlng a lateral flange 2 at its lower end through which bolts or other fastening devices may be inserted into a workbench or other fixed 30 support, indicated at 3. to secure the base member firmly in operative position. The lateral flange or foot 2 and the standard are reinforced by webs 4 cast integral therewith at the angles formed thereby, as shown and as will be understood. The standard 1 is provided with an opening, indicated at 5, therethrough and above and below said opening on the vertical diameter of the same, vertical slots 6 are formed through the standard. as clearly shown in Fig. 2. Secured to the face of the standard 1 by cap screws or bolts, indicated at 7, is a core plate 8 which above and below its center has Vertical slots 9 formed therethrough which slots are alined with the slots 6 in the standard for a purpose which will presently appear. The core plate is provided at its center on its outer side with a core 10, preferably of semi-circular sectional contour and having a radius corresponding to the radius of the bushing which is to be formed, it being understood that in actual practice a variety of the core plates may be provided for interchangeable use and they may be very easily and rapidly mounted on the supporting standard by merely removing and then reinserting the cap screws or bolts 7. The core 10 is formed on opposite sides with projections 11 which will produce small recesses in the edges of the bushing, the bushing being indicated at 12 in Fig. 5, and the recesses at 13 in said figure. Bosses or studs 14 are also formed on the face of the core plate adjacent and at opposite sides of the core 10 and these studs or bosses 14 are so disposed that they will engage in the openings provided for securing bolts in the attaching lugs or flanges of the connecting rods or half bearings in which the bushing is to be formed. Above and below the core 10, jaws 15 and 16 are slidably mounted upon the face of the core plate, each jaw having a basal member 17 preferably in the form of a flat plate having its side edges disposed adjacent and in sliding engagement with vertical ribs 18 formed on the face of the core plate. as clearly shown in Figs. 1 and 4. Upon the outer side of each guide rib 18, a flange 19 is secured by the cap screws or bolts 7. the several flanges being so disposed that they will project inwardly beyond the respective ribs and 8 overlap the adjacent side portions of the respective basal members 17, the side edges of said basal members being rabbeted to accommodate the overlapping edges of the guide flanges. as will be understood upon reference to Fig. 1. The lower jaw 16 projects outwardly from the corresponding base member 17 in a semi-circular form and in its upper surface is formed with a recess 20 whereby it may fit about the lower end of the core 10. as shown in Fig. 2, and above said recess 20 it is formed with a second upper concentric ledge 21 which will be disposed in front of the core when the device is in use and will define a second upper recess in which the lower portion of the bushing may flow and be cast. The upper jaw 15 also has a semi-circular portion projecting from the face of the base member 17 but the lower side of the jaw 15 is fiat and in one plane so that it may rest on the upper end of the core 10, as shown in Fig. 2. The upper jaw, however, does have a depending rib or flange 22 at its margin which, when the device is in operative position, will be disposed in front of the core 10 concentric therewith but spaced therefrom, and through the upper portion of the jaw 15 is formed a pouring opening 23 which leads directly into the space 24 between the rib 22 and the core 10, as shown.

Secured in the opening 5 of the main support 1 is a stud or pivot post 25 which projects from the back of the standard, as shown clearly in Figs. 2 and 4:, and upon this stud or post is rotatably mounted a cam plate 26 in which are upper and lower oppositely disposed eccentric arcuate slots 27, the cam plate being provided upon its periphery with a radial projection or handle member 28 to which may be attached a lever extension or a connection whereby the cam plate may be operatively coupled with a treadle or other operating device. The cam plate is retained in position on the post 25 close against the back of the standard 1 by any convenient means, such as acotter pin indicated at 29, and the eccentric slots 27 receive the rear ends of studs or pins 30 which are firmly secured in the aws 15 and 16 and project rearwardly therefrom through the vertical slots 9 and 6 in the core plate and the standard, respectively, as shown clearly in Fig. 2. It will now be understood that if the cam plate 26 be rotated about the post 25 the studs or pins 30 will be moved radially with respect to the post 25 so that they will shift toward or from each other and, consequently, will move the aws 15 and 16 into or out of operative relation to the core 10.

To illustrate the use of the device, a portion of a connecting rod is shown at 31, it being noted that a half bearing 32 is formed at the end of the rod which half bearing is provided at diametrically opposite points with lugs having openings 33 therethrough through which and corresponding openings on the mating half bearing fastening bolts are inserted to secure the bearing members about a crank or wrist pin. hen the bushing with which the bearings are provided becomes worn so that the parts do not operate in proper alinement, the old bushing may be ground out from the bearings and the bearing which is to be rebabbitted then disposed between the jaws 15 and 16 with the openings 33 receiving the studs 14c, as shown in 1. The half bearing will thus be disposed concentric with the core 10 on the core plate and in spaced relation to the same, after which the cam plate is rocked so as to bring the jaws 15 and 16 into engagementwith the top and bottom of the bearing rcspect-ively, as shown in Fig. 2. This shifting of the aws will bring the ledge 21 directly under the lower end of the bearing while the pouring opening 23, 24 will be directly over and in communication with the space between the core and the bearing, also as shown in Fig. 2. The molten Babbitt metal may then be poured through the pouring opening 23 by a ladle or, as is preferred, through a pouring pipe which is controlled by a cut-off valve and is disposed in proximity to the jaw. The metal will flow into and entirely fill the space between the half bearing and the core and will project beyond the top and bottom of the bearing into the space 24 and the space defined by the ledge 21 forming projecting flanges 34, as shown in Fig. 5. The Babbitt metal will also flow through the openings 35 in the half bearing and form keys or plugs filling said openings whereby the bushing will be firmly anchored in the hearing. The jaws are then moved apart by manipulation of the cam plate and the bearing with the bushing therein is withdrawn so that the bushing may be subsequently finished in a boring machine.

Upon reference to Fig. 3, it will be understood that downward movement of the projection 28 will result in movement of the pins 30 from each other so that the clampmg aws will be separated. In actual practice, a treadle below the workbench is connected with the projection by a rigid connecting rod or link, and a spring is connected to the treadle in such manner as to urge the same upward and move the jaws 1to work-clamping position. The workman thus has his hands free to remove a connecting rod or hearing or to insert one while manipulating the treadle by foot pressure, and the bearing will be held automatically through the action of the spring while the poured metal is cooling. This treadle and spring arrangement is common shop prac tice and illustration thereof is deemed unnecessary.

From the foregoing description, taken in connection with the accompanying drawings, it will be seen that I have provided an exceedingly simple apparatus whereby rebabbitting of bearings may be rapidly, accurately and easily accomplished.

Having thus described the invention, I claim: I

1. A rebabbitting mechanism comprising a support, a core plate rigidly secured upon one side of the support and having a central core on its outer face, jaws slidably mounted on the core plate above and below the core to cooperate therewith, the upper jaw having a pouring opening therein through which molten metal may be poured to fill the space between the core, the jaws and a bearing clamped by and between the jaws, a cam plate mounted on the back of the support parallel with the core plate, and means on the jaws engaging the cam plate whereby said cam plate will move the jaws toward and from each other.

2. A rebabbitting mechanism comprising a support, a core plate secured upon the face of the support and having a core formed on its outer side, jaws mounted slidably on the core plate above and below the core to cooperate therewith in forming a mold in which a bushing may be poured, the core plate and the support having alined vertical slots formed therethrough, a cam plate rotatably mounted on the back of the support and provided with upper and lower eccentrically disposed arcuate slots, and studs projecting rearwardly from the respective jaws through the slots in the core plate and the support and engaging in the eccentric slots in the cam plate.

In testimony whereof I aflix my signature. 2o LOWELL STAFF. [11. s.]

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