US 2423737 A
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July 8, 1947. B, VAN 2323,73?
BELT ABRADING MACHINE Filed my 3, 1945 40 INVENTOR. Jhn Tavano BY i f 23 a v W Patented July 8, 1947 1' UNITED STATES PATENT OFFICE,
John B. Tavano, Waterbury, Conn, assignor to The Tavano Aero EngineeringGo Waterbury, Conn, a corporation'of Connecticut I Application May, 3, 1945, Serial No. 591,757
4 Claims. (Cl. 51 -135) This invention relates to abrading machines, .is made ofamotor I and mor particularly to; a, machine employing an endless belt of abrasive tape passing over a pair of motor-driven pulleys carried by an upright U-shaped casing.
One object of the presentinvention is to provide a portable abrading machine of the above nature in which the upper pulley is mounted on a quick-releasing sh'aft having a toggle-locking action, so that it will remain in operating position until it is desired to change the belt.
A further object is to provide a device of the above nature which will be simple in construction, inexpensive to manufacture, light in weight, ornamental in appearance, compact, easy to install and manipulate, and very efficient and durable in use.
With these and other objects in view, there has been illustrated on the accompanying drawing, on form in which the invention may conveniently be embodied in practice.
The present machine is adapted for use especially for removing burrs from cast metal parts, such as wrenches, and other articles, and in which the casing is cut away to expose the outer stretch of the belt so that it will be permitted to penetrate slotted parts which could not be abraded with a grinding wheel.
The present invention may also be used on articles of plastic, glass, and other materials, and will perform its work rapidly and do operations impossible with cylindrical grinding wheels.
In the drawing,
Fig. 1 represents a side view, partly in section, of an abrading machin embodying the invention.
Fig. 2 is a front view of the same, with parts broken away for clearness.
Fig. 3 is a transverse sectional View of the same, taken along th line 3-3 of Fig. 1, looking in the direction of the arrows.
Referring now to the drawing, in which like reference numerals denote corresponding parts throughout the several views, the numeral III indicates a relatively thick fiat heavy rear vertical supporting plate of U-shaped construction having a narrow intermediate section and provided with a vertical edge flange II, to which is secured a thin casing I2 having a short curved top hood I 3 extending downwardly along the edge of said plate It], and a short curved bottom hood I4 extending upwardly from the the bottom edge of said plate I0, said casing being of thin material and having flat upper and bottom surfaces.
At the bottom of the rear plate I0, provision 2 secured thereto by a plurality of bolts l6, l1, I8, I9.
The casing I2 is provided with a swingable thin cover 20 secured thereto as by a pair of hinges 2|, 22, said cover 20 being held detachably in closed position by means of apair of snap-locking catches 23, 24 fitting over the edges of the hoods I3, I4, as clearly shown in the drawing. The catches 23, 24 are preferably secured to the hoods I3, l4 by rivets 24a, 24b, and have offset end lugs 24c, 24d.
In order to drive the abrasive belt 42, provision is made of a bottom pulley 25 mounted upon a horizontal shaft 21 by means of a set screw 26the shaft 21 being secured to a motor drum 28 in any suitable manner.
At the upper part of the casing I2, provision is made of a horizontal shaft '29 passing through an aperture 30 in the plate I0 and secured in operating position by means of a. pair of bearing plates 3I, 32, riveted or otherwise secured on opposite sides of the plate H], as clearly'shown in Fig. 1.
The shaft 29 is provided with a releasing handle 33, mounted behind'th plate In and secured to the rear end of the shaft 29 by an attaching pin 34. The shaft 29 has rigidly secured thereto, as by a pin 31, a rocking arm 36 having on its extremity an eccentric offset shaft 35 upon which is mounted an upper releasable pulley 38.
The upper pulley 38 is adapted to be held on the shaft 35 by a forward nut 39, and is provided with a bearing bushing 40 within the interior of said pulley.
In order to limit the motion of the releasable pulley 38 when the handle 33 is moved from the full line to the dotted line position shown in Fig. 1, to a point just beyond the dead center, provision is made of a stop pin 4| secured to the rear plate Ill, as by screw threads, whereby the releasable pulley 38 will be prevented from being released until the handle 33 is operated in the reverse direction.
Operation In operation, when it is desired to release the abrasive belt 42 for permitting it to be changed or replaced with a fresh belt, it will only be necessary to swing the handle 33 from the full line position to the dotted line position shown in Fig. 1.
While there has been disclosed in this specification one form in which the invention may be embodied, it is to be understood that this form is shown for the purpose of illustration only, and that the invention is not to be limited to the specific disclosure, but may be modified and embodied in various other forms without departing from its spirit. In short, the invention includes all the modifications and embodiments coming within the scope of the following claims.
Having thus fully described the invention, What is claimed as new and for which it is desired to secure Letters Patent is: a
1. In an abrading machine, .a U-shaped casing open at one side and having a. base, a. motor attached to the rear of said casing and having a horizontal shaft, a pulley mounted on said motor shaft, a vertical rockable arm ,pivotally mounted at the top of said casing and having a handle for operating the same, a horizontal upper shaft 'secured to said rocking arm on an offset axis eccentric from the pivotal axis of said arm and located Within said casing, a releasable pulley rigidly secured to said upper shaft, an abrasive belt passing around said pulleys, and a stop pin secured to said casing in the path of said arm at a point just behind the line passing through the axes of said motor shaft pulley and rockable arm, said upper pulley being releasable by forcing it forwardly past said line in a direction away from said stop pin.
2. The invention as defined in claim 1, in which REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 2,055,351 Hormel Sept. 22, 1936 2,367,107 Emmons Jan. 9, 1945 843,010 Gramelspacher Feb. 5, 1 2,202,425 Marsilius May 28,1940
FOREIGN PATENTS Number Country Date 839,440 'France Jan. 4, 1939 799,849 France Apr. 20, 1936