US1462420A - Grinding machine - Google Patents

Description

July 17, 1923.

E. W. MIKAELSON ET AL GRINDING MACHINE Filed June 27 1919 2 Sheets-Sheet 1 July 17, 1923.

E. w.' MIKAEILSON ET AL.

GRINDING MACHINE Filed June 27.

1919 2 Sheets-Sheet 2 Patented July 17, 1923.

it hit .3 T LATE 3 v meant QFFHQEP ERIK *w-MI AELson AND ANDREW A. itnAvE, or EASTON. r'nNitsYnvAmn, As- "sxenons T "rnnnnwnnn "ENGINEERING COMPANY, A coRroRAnon -or PENN- SYL'VANIA.

GRINDING MACHINE.

Application filed June 27, 1919. Serial No. 307,083. 7

and a grinding wheel and suction housing at the other end, together with an intermediate support at or about the center of gravity of the entire system, the grinder being controlled by the operator in a well understood manner.

An object of this invention is to provide trunnion supporting means for the machine. capable of permitting universal movement of the wheehas well as swinging movements in various planes, one particularly advantageous result of this invention being that a very long straight surface can be ground, whereas previously proposed suspended types of grinders have been limited as to the extent of surface which could be ground without resetting the work.

A further object ofthe invention is to provide an improved mounting and arrangement'of theexhaust blower whereby it is kept out of the way adj acent'the motor end, and a still further object of the invention is to provide a strong and yet simple construction which will withstand hard usage.

Figure 1 is an elevation of a machine embodyingthe invention,

Figure 2-is a plan View, a

Figure 3 is a cross section on the lin 3, 30f Figure l,

Figure 4 is a sectionon the line 4, 4 of Figure 2, 1

Figure 5 is a front elevation,

Figure 6 is a section on an enlarged-scale showing the driving mechanism for the wheel, and

. Figures 7 and 8 show a modification.

1 represents a foundation carrying a 'socketed pedestal 2 receiving a vertically disposed stub shaft-"3 supported on a bottom stop bearing '4 and held in engagement with the'fiange- 5. Stub-shaft 3 carries a frame -c0n-s-istingof angle iron tracks 8 connected at their ends by uprights 9, 9i acting as stops and the uprights bein'gconnected by lower cross pieces 10, 11 being bracing angle plates at each end. This entire structure from the stub shaft 3 is rotatable in, the

pedestal 2,. and is removable by' lifting when ridge on the tracks 8 so that the dirt will not interfere with rolling. The trunnion ring 13 is clamped to the tube 12 by setscrew 15, so that the tube can be longitudinally adjusted the ring, but. also could be an-gularly adjusted if desired. By using larger wheels 48 to roll on the floor or ground and hold the motor and wheel elevated, as in Figures 7 and 8, thepedestal and tracks can be dispensed with, and a machine provided whichcan be used anywhere in the shop or yard where thepower can be supplied to the ,motor by cable. By suitable proportioning and design of the wheels, pedestal and tracks, the :machine can'be used either on the ground oron tracks as desired, i

At one endof the tube 12 is a mQtor 16, centrifugal exhauster 17 connected to settling chamber 18 and supported by a pipe 19 connected to the hood 20 over the wheel 21 through flexible tube 22, the motor and exhauster being preferably mounted on the same support 23 as shown, thissupport being clamped to the rear end of the tube 12 as at 24.

At the front end of the tube 12, the grinder carrying frame and housing 25 is rotatably mounted thereon by 'a joint 26, shown in detailin Figure 6, so as tov permit the grinder and its driving connections to be rotatable on the tube. As seen in Figure 6, the tube 12 carries rollers 27 on which the grinder carrying frame, 25 bears. 28 is the 'motor shaft provided at the front end with a separable coupling 29 which receives the front shaft 30, the latter being supported in rear bearing 31 and a front bearing 32and having a thrust bearing 33. At the 7, front end of shaft .30. is a bevel pinion 34 meshing with a similar gear .35 on grinder shaft 36,,the wheel 21 being fastened thereonin the usual manner between collars 37. Thegrinder shaft' 36 is supported. in bearings 38 and a thrustbean,

vi-ng 39, carried by the "housing 25. The housing is horizontally divided similarly to automobile gearing, and the upper half 40 carriesta frame 41 having the controlling handles lfz, for the operator to grasp. The frame 41 also supports the hood 20. The hood 20 may be of any desired design, and is preferably provided with a settling chamber 4:3 as shown, this settling chamber being connected to the flexible tube 22 and being itselfrarried by a frame 14 extending laterally from the joint member 26. The function of the flexible tubing is to maintain the suction connection while the operator 15 tilts the wheel out of its normal vertical plane. The parts are so mounted and disposed that the grinder head is practiany balanced to remain in this vertical plane, weights being used if necessary for 'z this purpose, 4E5, 46 are deflectors placed in the settling chambers 18,, 43 respectively, the'purpose of whichis to trap as much of the heavy material as possible before it reaches theexhauster 17 it having been found in practice that the exhauster has very little to do but to move air, and hence its bearings do notbecomeworn out "by the grit which would otherwise bepresent. The puttingof the blower at the front end near the wheel has been found objectionable for this reason in other types of grinders, it being diflicult to keep the bearings in good condition. Similar difiiculty has arisen where it ,was sought to carry off the dust th gh the tube, as the dust tends to settle 'in the shaft bearings and sometimes in the gears and has given considerable trouble.

The operation I of this machine will be understood from the foregoing description, 40 but it is pointed out that by reason of the travel permitted by thewheels, this machine can cover unlimited territory in a shop er yard and can also work on much i, larger surfaces, without moving the work,

than has been permitted by other machines. Inasmuch as the machine is self-contained "and "with no auxiliary appendages, same can be practically balanced, and the weight is always supported on the floor or on a solid foundation,.it is found to be less tiring to the operator than where he has to man- ,"ge a heavy mass suspended from the ceilng. p Various modifications and changes may b e1 ma de 'in the details "herein described- ,without departing from the scope of the appended claims. What is claimed, isi.

' 1'. Inagrinder, a motor, a grinding wheel driven thereby, a main body carrying, said inotorf at lone end and said grinding wheel at theopposite end, andv wheeled supporting me n directly carried by said main body intermediate; the grinding wheel and the motor,"said motor and grinding wheel being substantially in. balance jrelatively to said supportingmeans whereby the operator adjacent the grinding wheel end can readily manipulate the grinder over thework. f

2. In a grinder, amotor, a grinding wheel driven thereby, a main body carrying said motor at one endland saidgrinding wheel at the opposite end, a swivel connection betweensaid body and said grinding wheel for permitting variation of the plane of rotation ofthe latter,and asupporting axle and wheels directly carried by said main body intermediate the grinding wheel and the motor. i}

3. In a grinder,fla pedestal, arotatable frame carried thereby, a tr-ackway secured to said frame, a grinding'machine comprising a grinding wheel and a driving motor, and means for mounting said machine so as to be movable on said trackway.

4. In a grinder, in combination: a pedestal; a vertical shaft; journalled in said pedestal whereby the shaft may rotate on its'vertical axis; a horizontal trackway supported by the shaft; wheels supportedfby and rollable on said trackway a trunnion having a horizontal axis supported by said wheels; a somewhat elongated frame supported by said trunnion; means for 'grinding supported by said frame, the center of gravity of the frame and grinding means lying in the line of action of the trunnion wherebythe grindingmeans may be given a motion of translation, rotation in a horizontal plane or oscillation in a vertical plane and the said center of gravity may be maintainedat a constant elevation.

5. In a grinder, in'combination: an elongated frame: a. grinding wheel; means" for supporting the grinding wheel at one end of the frame whereby it may be oscillated about the longitudinal axis of theframe; a'motor supported at the otherend of'the frame; means for supporting the frame whereby it is movable in both a horizontal plane in motion of translation or rotation and in-a vertical plane and thecenter of gravity is always maintained at a constant elevation.

6. In a grinder, in combination: a frame;

a motor supported at one point by said frame; a grinding wheel supported at another point by said frame; 'a pedestal revolvable upona vertical axis; a horizontal trackwa-y supported by the pedestal supporting means movable upon the trackwayy means for attaching said supporting means to said frame whereby the frame is movable thereon and theline of action of said supporting means passes through substantially the center of gravity of the system com-- prising the frame and the wheel'and'the motor, whereby no movement of the wheel in' either a horizontal or vertical plane alters the eleyation of the 'center of gravity of said system. I

7. In a grinder, in combination: an elongated frame; a grinding wheel supported by one end of the'frame; a motor supported at the other end of the frame; means for driving the wheel by the motor; means for supporting the frame whereby it is movable in both a horizontal plane in motion of translation or rotation. and in a vertical plane and the center of gravity is always maintained at a constant elevation.

57 wheels whereby they may revolve and the axis of the trunnion may revolve in a horizontal plane whereby the frame may have a motion of translation, rotation in a horizontal plane and oscillation in a vertical plane.

9. In a grinder, a pedestal, a rotatable frame carried thereby, a trackway secured to said frame. a grinding machine comprising a grinding wheel, a driving motor, and a swivel connection interposed between said wheel and said motor to permit variation of the plane of rotation of the former, and means for mounting said machine so as to be movable on said trackway.

10. A grinding machine comprising a supporting structure, an elongated arm, power means at one end of and carried by the arm, a grinding tool at the other end of the arm, driving connections between the power means and grinding tool, a pivotal support for the arm. and means whereby the arm may be adjusted in the direction of its length with respect to the pivotal supporting means to balance the arm and parts carried thereby.

11. A -grinding machine comprising an elongated rock arm with a power unit at one end, a grinding tool at the other end, driving connections between the power unit and grinding tool, and means associated with the axis of rocking of the arm for permitting lengthwise movements of the arm and to balance the arm and permit rocking movements thereof.

12. A grinding machine comprising a supporting structure, an elongated arm pivotally mounted on said structure, a power member on one end of the arm, a grinding tool at the'other end of the arm, driving connections between the power member and the tool, and means whereby the arm may be adjusted lengthwise of the supporting structure without disturbing the pivotal connection. i

13. In a grinder a turn-table having a trackway positioned thereon, an elongated body portion, a sleeve for encircling said body portion and adjustably connected therewith, trunnions projecting from opposite sides of said sleeve, a wheel on each trunnion adapted to roll on said trackway and upstanding arms carried by said trackway, said arms serving as stops for the wheels and as a means whereby said turntable may be rotated.

14. Ina grinder an elongated body portion, a sleeve encircling said body portion near its mid length and adjustably connected therewith, trunnions radially extended from opposite sides of said sleeve, wheels mounted on said trunnions, a motor carried at one end of said. body portion, a grinding wheel carried at the other end thereof, and means operatively connecting said motor and grinding wheel.

15. In a portable grinder, a motor, a grinding wheel driven thereby, an elongated main body carrying said motor at one end and said grinding wheel at the other end,

and a supporting wheel attached on each side of the intermediate portion of the main body, and adapted to run with longitudinal movement of the body on a low supporting surface, said wheels being so positioned that the motor at one end substantially balances the grinding wheel at the other end and permitting the operator at will to traverse the grinding wheel in any direction longitudinally of the body by rolling said supporting wheels on a horizontal surface without vertically shifting the center of gravity of the entire machine.

ERIK W. MIKAELSON.

ANDREW A. NEAVE.

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