US2873558A

US2873558A - Swing grinder suspension

Info

Publication number: US2873558A
Application number: US683099A
Authority: US
Inventors: Olsen Richard
Original assignee: United States Steel Corp
Current assignee: United States Steel Corp
Priority date: 1957-09-10
Filing date: 1957-09-10
Publication date: 1959-02-17
Anticipated expiration: 1976-02-17

Description

Feb. 17, 1959 R. OLSEN swmc GRINDER SUSPENSION Filed Sept. 10, 1957 I/VVENTOI? RIC/M R0 OLSEN 1- w Attorney United States Patent 1 2,873,558 SWING GRINDER SUSPENSION Richard Olsen, Chicago, llh, assignor to United States Steel Corporation, a corporation of New Jersey Application September 10, 1957, Serial No. 683,099

- 1 Claim. (Cl. 51-99) The present invention relates generally to swing grinders and more particularly to an improved suspension means for supporting a swing grinder.

The conventional swing grinder consists of a longitudinal frame having a driving motor mounted adjacent one end and a grinding wheel journaled on the other end. The motor and grinding wheel assemblies are equipped with pulleys whereby the grinding wheel is rotated by V-belts running from one pulley to another. The grinder is suspended from a chain fall by means of a bracket located at approximately the center of gravity of the frame so that the grinder is in balance when suspended. In operation, the operator pivots the grinding wheel end of the assembly downwardly and forces the grinding wheel against a surface to be ground by exerting pressure on a handle bar provided on the frame adjacent the grinding wheel.

The grinding pressure that can thus be exerted by an operator is limited and this constitutes a serious disadvantage in the use of swing grinders. Experience has shown that an average workman can exert approximately 100 pounds per square inch grinding pressure with a conventional swing grinder. This is a limiting influence on the amount of work that can be produced by an operator in a given period.

It is accordingly, an object of the invention to provide an improved suspension for a swing grinder whereby the grinding pressure that can be exerted is substantially increased over that possible heretofore.

It is another object of the invention to provide an improved suspension for a swing grinder which may be adjusted to provide different degrees of grinding pressure.

It is a further object of the invention to provide an improved suspension for a swing grinder which is inexpensive and rugged in construction and which can be easily incorporated into the structure of presently existing swing grinders.

These and other objects will become more apparent after referring to the following specification and attached drawings, in which:

Figure 1 is a side elevational View of a swing grinder constructed according to the invention showing the grinder in suspended non-operating position; and

Figure 2 is a view similar to Figure 1 to a slightly enlarged scale showing the grinder in operating position.

Referring more particularly to the drawings reference numeral 2 designates generally a swing grinder having the suspension of the invention incorporated therein. Swing grinder 2 includes a frame 4 having an electric drive motor 6 mounted adjacent one end and a grind wheel 8 journaled at its other end. The wheel 8 is driven by means of a transmission V-belt 12 which connects the motor and grinding wheel in the conventional manner. A handle 14 is provided on the wheel end of frame 4 whereby a workman can manipulate the grinder. A bracket 16 is pivotally mounted on a bar member 18 of frame 4 for suspending the grinder from an overhanging support.

The structure just described is conventional and is not claimed as my invention the details of which shall now be described.

The suspension of my invention includes a generally L shape fulcrum arm 20 which is mounted on the bracket 16 with its long leg 22 projecting toward the motor 6 generally parallel with the frame 4. The short leg 24 of arm 20 extends toward the frame 4 and is adapted to en- 2,873,558 Patented Feb. 17, 1959 gage the bar member 18 when the grinder is suspended in inoperative position to maintain the grinder substantially balanced in a horizontal plane, as best shown in Figure l.

A series of holes 26 is provided along the length of the arm 20. The grinder is suspended by means of a hoist 28 and chain fall 30. The hoist hook 32 is connected with a bracket 34 which is pivotally mounted in the hole 26 adjacent the bracket 16. The hook 36 of the chain fall is attached to a bracket 38 which is removably fitted in one of the other holes 26.

The hoist 28 and chain fall 38 may be suspended from trolleys 40 and 4.2, respectively, which are mounted for movement along an overhead track 44.

The grinder assembly can be raised and lowered from a balanced position by means of the hoist 28.

In operation, the swing grinder is raised or lowered by means of the hoist 28 to approximate working level just above a workpiece W to be ground. Then the hoist is slackened off until the entire assembly is suspended only by the chain fall. This causes the wheel end of the grinder to tilt downwardly and the grinding wheel 8 to engage the workpiece W, as shown in Figure 2. The weight of the downwardly tilted end of the grinder pro vides grinding pressure so that it is not necessary for the operator to exert downward force on the grinder to obtain grinding pressure as was done heretofore. Thus, the Weight of the grinder is utilized to obtain grinding pressure and the operator uses the handle M merely to guide the grinding wheel across the surface of the workpiece during the grinding operation. If a maximum degree of grinding pressure is desired the chain fall bracket 38 is positioned in the hole 26 at the extreme end of the arm 20. When lesser amounts of grinding pressure are desired the bracket 38 is positioned in one of the holes 26 closer to the center of gravity of the grinder assembly.

Through the use of the suspension of the invention grinding pressures up to five times those heretofore possible have been obtained.

While one embodiment of my invention has been shown and described, it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claim.

I claim:

In a swing grinder adapted to be hung by a first and second suspension means from an overhanging support, said grinder having an elongated frame, a motor carried by said frame adjacent one end thereof, a grinding wheel rotatably journaled on said frame adjacent the end there of remote from said motor, and a suspension bracket pivotally mounted on said frame adjacent the center of gravity thereof the improvement therewith of a substantially L-shape fulcrum arm attached to said bracket, the long leg of said L-shape fulcrum arm extending substantially parallel with said frame toward said motor, the short leg of said L-shape fulcrum arm extending substantially normal to said long leg on the side of said bracket toward said grinding wheel, said short leg normally engaging said frame, said long leg of said fulcrum arm having a plurality of attaching means along the length thereof for selectively receiving said first suspension means substantially at the center of gravity of said frame and said second suspension means at a selected position between said center of gravity and motor end of said frame.

References Cited in the file of this patent UNITED STATES FATENTS 2,132,640 Mummert Oct. 11, 1938 2,718,732 Comstock Sept. 27, 1955 FOREIGN PATENTS 437,550 France Feb. 22, 1912