US2109292A

US2109292A - Grinding device

Info

Publication number: US2109292A
Application number: US91611A
Authority: US
Inventors: Hribar Joseph
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-07-20
Filing date: 1936-07-20
Publication date: 1938-02-22
Anticipated expiration: 1955-02-22

Description

Feb. 22, 1938.

J. HRIBAR GRINDING DEVICE Filed July 20, 1936 2 Sheets-Sheell 2 'Patented Feb. 22, 193s 2,109,292 i UNITED STATES PATENT OFFICE GRINDING DEVICE Joseph Hribar, Lockport, lill.

Application July 20, 1936, Serial No. 91,611

14 Claims. (Cl. 51-241) This invention relates particularly to a grindmicrometer adjustment for the inner frame C, ing device which may be usefully employed in enabling the grinding element D to be nicely grinding the connecting-rod bearings of aadjusted with relation to the bearing-portion B crank-shaft, for example. .of the crank-shaft.

'Ihe primary object is to provide a device of The main frame A of the device preferably is '5 this character which may be used to grind the constructed of a plurality of members which connecting-rod bearings without the necessity may be taken apart at will. In the illustration of removing the crank-shaft from the main given, the frame comprises an angular basebearings of the engine. portion I which aiTords an end-member la and 'Ihe invention is illustrated in a preferred ema longitudinal member lb, the tubular handle E l0 bodiment in the accompanying drawings, in being -xedly mounted in the end-member I a; whichv a side-member 2 having its lower portion secured Fig. 1 is an edge elevational view of a desirable by cap-screws 2a to the member lb; and a sideembodiment oi the invention; Fig. 2, a -view at member 3 having its lower end secured by capright angles to the View shown in Fig. 1, illusscrews 3a to the end-member la. The upper endl5 trating the grinding device in positi i for grindportions of the side-

members

2 and 3 are curved ing a crank-bearing of a crank-shaft, the handle towards each other, as indicated at 2b and 3h of the device being shown brokenly; Fig. 3, a respectively. The ends of the members overlap longitudinal sectional View of the improved deand are interlockingly connected, as by means vice; Fig. 4, an enlarged broken sectional view of a. hook and groove connection indicated at 4 20 taken as indicated at line 4 of Fig. 3; and Fig. 5, and a pin and hole connection as indicated at 5. an enlarged sectional view taken as indicated at When the screws i!a are removed, the member 3 line 5 of Fig. 3. f may be swung outwardly and upwardly and then It may be stated preliminarily that the imlifted away from the upper end of the member 2,

proved grinding device is adapted to be susthe interlock connections at 4 and 5 permitting 25 pended from a crank of' the crank-shaft after this action. the crank has been disconnected from the con- The inner surface of the upper end-portion of necting-rod joining it to thepiston of the engine; the member 2 is equipped with a bearing-block E also, that the grinding device preferably employs which is secured in position by 'screws 6b. The

a belt-like grinding element which preferably is inner surface of the side-member 2 is provided 30 operated by an electric motor, the grinding being with a guide 'l in which is adjustably mounted effected while the engine-motor turns slowly. It a bearing-member la. The member 'la is sewill be understood that in operation the upper cured to the side member 2 by means of a headend of the implement follows the movements of screw 'lb which may be adjusted in a slot 8 with the crank-shaft while the operator of the grindwhich the member 2 is provided. Y 35 ing device steadies and guides the lower end of Similarly, the side-member 3 is equipped at its the implement by means of the handle with' inner side with a guide 9 in which is mounted a which it is equipped. bearing-member 9a secured by means of a screw In the embodiment illustrated, A designates a, 9b which can be adjusted in a slot I0 with which 40 main frame which is adapted to `be suspended the side member 3 is provided. 40

from a crank-portion B of a, crank-shaft; C, an The bearing la may be adjusted towards the inner frame which is longitudinally adjustable crank-shaft by means of an adjusting screw II and which is equipped at its lower end with a which has threaded connection with a lug Ila rigidly secured threaded stem, or adjusting carried by the side member 2.

screw, C; D, abelt-like grinding element carried The bearing member 9a may be adjusted to- 45 by an upper roller D and a lower roller D2 jourwards the crank-shaft by means of an adjusting naled in the inner frame C; E, a handle xedly rod l2 whose upper end has threaded connection secured to and depending from the lower end of.A with a lug -I2a carried by the side member 3. the main frame A; and F, an internally threaded The lower end of the rod I2 extends through a sleeve (or nut) connected with the threaded stem bearingmlzuig/LZb/wthwxilczh the side-member 3 50 C' and having a" head portion F' journaled in the of the n frame is pr ided at its lower end. lower end of the handle E, from which depends The lower extremity of the adjusting rod I2 is` a reduced extension F2 on which is rigidly seequipped with a knurled head I2c which is discured a graduated actuating knob F3. n posed a short distance below the end-member IIl The nut F and the attendant parts serve as a of the main frame. 55

lI'he bearings

6, 1a and 8 with which the main frame is equipped afford a three-point bearing of the main frame against the crank-shaft.

The inner frame C is shown as comprising an angle-form base-member I3 which affords an end-member I3n and a longitudinal member I3b.

The longitudinal member I3b has sliding dove.

l in the tubular member I1, the member I8 being is secured to a head.' or block, I9 in which the yupper roller D is journaled, the parts being connected by small bolts 20, as shown in Fig. 3; a spring 2|, confined between the lower end of the tubular plunger I8 and the member I4; and a clamping screw 22 by means of which the members I1 and I8 may be rigidly connected together at will.

'Ihe spring 2| may serve to give desired tension to the belt-like grinding element D, after which the clamping screw 22 may be tightened if desired. It may be stated that the upper portion of the tubular member I1 isprovided with a longitudinal slot, as indicated at I1, the clamping screw 22 extending across this slot.

'The tubular member I1 may be provided with a transverse perforation, indicated at 23; and the tubular member I8 may be provided at a somewhat higher point with a perforation 2|. When desired, the set screw 22 may be loosened, the plunger I8 may be depressed to slacken the belt, and a pin (not shown) may be inserted through the perforation 24 into the perforation 23, when these perforations are in registration. This may be done when it is desired to remove the belt D. To permit such removal, the lower portion of the inner frame may be provided with a slot 25 (Figs. 1 and 3) in which is removably secured a fillet 25 which is held in place by the cap-screws I5. l

The lower roller D2 is journaled in the lower portion of the inner frame C. It is provided with a shaft 26 journaled in bearings 21 with which the inner frame is provided. These bearings may be ball-bearings if desired. 'I'he shaft 26 extends transversely of the frame; and, as will be understood from Figs. 1 and 5, the shaft is connected with a flexible shaft 28 which may be driven by means of an electric motor (not shown). In practice, the electric motor may be direct-coupled to the shaft 26, so that the 'roller D2 which drives the belt D may be actuated at high speed. A speed of .two or three thousand revolutions a minute is suitable.

The lower roller D2 preferably is crowned very slightly at 29. The upper roller D' should be a true cylinder, however. It may be provided with transverse grooves 30 which permit some air circulation and tend to have a cooling effect.

From the description given, the operation will be readily understood. When the crank of aL crank-shaft requires grinding, the connecting rods from the pistons may be removed, after flrst .frame of the grinding implement, the implement may be hooked over a crank of the crank-shaft. The bearings 1B and 98L with which the main frame of the implement is equipped may be suit, ably adjusted with relation to the bearing member 6 to properly center the upper portion of the main framev upon the crank, it being understood that the frame-member 3 is re-applied after the implement has been hung upon the crank. By means of the micrometer adjustment indicatedat F-F3, the grinding element D may be adjusted to make suitable contact with the crank of the crank-shaft B. The engine may be turned at a slow speed. The grinding element may be operated at high speed by means of an electric motor, or other source of power. It would be possible, of course, to gear the grinding element of the improved implement to the engine of the automobile, if desired.

The range of adjustability of ,the bearing members 1a and 9 is suilicient to enable the implement to be adjusted to the usual range of shafts employed in connection with automobile enrgines.

The outer surface of themember Ib of the main frame preferably is bowed slightly. That is, the outer surface is slightly convex in a longitudinal direction, as indicated at 3| in Fig. 3. One of the screws 2 is located above the point where the member 2 bears against the convex surface,

4and the other screw 2a is located below that point.

Accordingly, the screws may be used as a means for truing up or giving proper symmetry to the frame, depending upon the extent to which the screws are turned inwardly, respectively.

The upper roller D is shown provided with a roller bearing. This is desirable because of the high speed at which the grinding element is operated. The endless belt I which 'forms the grinding element D may have its outer surface coated with fine carborundum or the like. It is possible, of course, to use grinding-belts having different abrasive effects. For example, a belt of rather high abrasive effect may be employed in the first portion of the grinding operation, and then a belt with an extremely ne grinding surface may be employed for finishing purposes.

.The improved implement enables the ordinary work of grinding the connecting-rod bearings of an automobile engine crank-shaft to be effected expeditiously and at relatively small expense.

The bearings may be toned up accurately by means of the improved implement without removing the crank-shaft.

'Ihe frame-member 2 is a strong, substantial frame-member and is secured very strongly to the base-member I of the frame. By reason of the convex surface indicated at 3I andthe connecting-screws 2B, the desired degree of verticality of the member 2 may be firmly established. The

opposite side member 3 is shown of thinner metal and its position is regulated by the member 2. In this manner, the desired symmetry of the frame is attained; and the inner. frame C, by reason of the substantial sliding connection which it has with the member Id, assures a true contact between the grinding belt and the crankshaft. It has been found that by very slightly crowning the roller D, the belt will stay on the rollers without diiilculty. The upper roller should present a true generally cylindrical surface, in order that the grinding belt may have line contact with the shaft Swhich is being ground.

The foregoing detailed description has been given for clearness -of understanding only, and j no unnecessary limitations should be understood therefrom, but the appended claims should be construed as broadly as permissible in view of the prior art.

What I regard as new and desire to secure by Letters Patent is:

1. A grinding implement of the character set forth, comprising an elongated frame equipped at its upper end with a crank-shaft bearing; a flexible endless belt of abrasive material mounted on a roller journalled in said frame; means for driving said belt; and means for adjusting said belt towards and away from the crank-shaft.

2. A grinding' implement as specified in claim l, in which said belt is mounted upon a pair of rollers journalled in a longitudinally adjustable inner frame mounted in the main frame.

3. A grinding implement as specified in claim 1, in which said belt is mounted upon a pair of rollers journalled in a longitudinally adjustable inner frame mounted in the main frame, said inner frame being equipped with a rigidly secured threaded stem and said outer frame being equipped with a micrometer adjustment acting through the medium of said threaded stem.

4. A grinding implement of the character set forth, comprising a main frame equipped internally at its upper portion with a bearing adapted to engage the upper surface of a crank and having its sides equipped with adjustable bearings adapted to engage the lower portion of the crank; an endless belt grinding element, of substantially the same width as said frame, adjustably mounted on rollers journalled in said frame; and means for driving said grinding element.

5. A grinding implement as specified in claim 4, having the lower end of the main frame equipped with a depending handle.

6. A grinding implement as speciiied in claim 4, in which the lower end of the main frame is equipped with a depending tubular handle and in which the grinding element is carried by an inner frame having an adjusting stem housed in said handle.

7. A grinding implement of the character set forth, comprising: a main frame comprising detachably related side-members having an interlock connection at their upper ends; a lower frame-member interposed between and secured to the lower portion of said side-members; an inner frame adjustable longitudinally within said main frame; an endless-belt grinding-element carried by rollers journalled in said inner frame; and means for actuating the lower roller and thereby actuating the grinding-element.

8. A grinding implement'of the character set forth, comprising: an outer frame comprising detachably related elongated frame-members; bearings mounted in the upper portion of said frame and adapted to engage a crank from which the main frame lmay be suspended: an inner frame adjustable longitudinally of the main frame; rollers mounted in the upper and lower end-portions of the inner frame; a grinding-belt mounted on said rollers; and means for actuating the lower roller.

9. A grinding implement as specified in claim 8, in which the main frame is equipped with an adjusting rod for one of the bearings which engages the crank, said adjusting rod extending through the lower end of the main frame.

10. A grinding implement as specified in claim 8, having the lower end of the main frame equipped with a tubular handle and having the inner frame equipped with an adjusting stem extending axially into said handle; and a nut mounted in the lower portion of said handle and engaging said adjusting stem, said nut having actuating means disposed below the lower end of said handle.

11. A grinding implement comprising an outer frame composed of detachably connected elongated members; bearings for a crank-shaft in the upper portion of said frame; an inner adjustable frame disposed below the space for the crank-shaft; an endless-belt grinding element mounted in said inner frame; and means for actuating said grinding element. l

12. A grinding element comprising a main frame consisting of detachably related members; bearings in the upper portion of said frame adapted to engage a crank; a handle connected with the lower end of said frame; an inner frame comprising collapsibly related upper and lower members; rollers journalled in said upper and lower members; a grinding belt mounted on said rollers; means for actuating the lower roller; and means for adjusting the inner frame longitudinally of the main frame.

13. In an implement of the character set forth: a main frame of elongated form comprising detachably connected members, said frame being equipped'internally at its upper end with bearings for engaging a crank-shaft; an inner frame provided with rollers adjustably connected with the outer frame; an endless grinding belt mounted on said rollers and adapted to-engage the crank-shaft when properly adjusted; and means for actuating said grinding element relative to the main frame.

14. In an implement of the character set forth: a main frame of elongated form comprising detachably connected members, said frame being equipped internally at its upper end with bearings for engaging a crank-shaft; a longitudinally collapsible inner frame adjustably connected with the outer frame and provided with supporting rollers; an endless grinding belt mounted on said rollers and adapted to engage the crankshaft when properly adjusted; and means for main frame.

JOSEPH HRIBAR.