US2647350A

US2647350A - Abrasive belt tool

Info

Publication number: US2647350A
Application number: US167978A
Authority: US
Inventors: John Y Blazek
Original assignee: LEMPCO PRODUCTS Inc
Current assignee: LEMPCO PRODUCTS Inc
Priority date: 1950-06-14
Filing date: 1950-06-14
Publication date: 1953-08-04
Anticipated expiration: 1970-08-04

Description

Aug. 4, 1953 J. Y. BLAZEK ABRAsIvE BELT Toor.

Filed June 14, 1950 OCDQ 5 .K A mu .d A M mm 4 u. N H .w w i Y B. z 2 Z 3 al f1.- -.-J I Pi 1L F l 8 3 z f1 ,3 um M 8 r/J/ m l` IU. w -ill 0 .d n l l W a U Il M E fr ,./l/l/l//f d l I 7 e e EL ,a 3 7 5 e .e 3L |14 3 Patented Aug. 4, 1953 ABRAsIvE BELT 'rooL .lohn Blazek, Maple Heights, Ohio, assignor to Lempco Products, Inc., Bedford, Ohio, a corporation of Ohio Application June'14, 1950, Serial No. 167,978

3 Claims.

The invention relates to abrasive tools and particularly to tools of the power driven abrasive belt class.

In various arts the surface left on metal by an abrasive wheel, cutting tool or the like, is not smooth enough or ne enough for the usesy to which it is to be put; and it is desirable to perform a final iinishing operation thereon bya very ne grained abrasive cloth or paper.

A large class of such surfaces are cylindrical surfaces, for example the bearings of an engine crank shaft. Such surfaces can be rotated in a machine between centers and in the vcase of crank shaft bearings are rotated in themachinethat grinds thein to size; and the invention has particular application to finally finishing rotating cylindrical surfaces; although as will appear hereinafter, it may be applied with advantage to non-rotary surfaces and to various shapes of sur-f faces.

The actual invention hereof is that set forth in the appended claims.

In general, however, the invention. comprises an abrasive belt, supported on pulleys and driven by an electric motor. Along flight of belt is provided between widely spaced pulleys and the said Eight while running on the pulleys is the part of the belt that is applied to the work, whereby the' yielding of the belt flight maires the contact of the abrasive with the work a yielding contact.

The motor, belt and pulleys are mounted in a portable frame of light weight whereby it mayv be easily brought to the work andoperated manually. Handles are provided for both hands of the operator, and so disposed that the weight of the device is well balanced in his hands, and .so that he can apply the belt iiight to the work with easily controlled yieldingT pressure, by a simple rocking movement of the handles.

Improved means is provided to adjust the tension of the said belt flight, and to permit the belt to be readily removed and replaced when worn; or to substitute for it one of different grain.

The objects of the invention are:

To provide generally an improved abrasive tool of the class referred to;

To provide an abrasive tool having the mode of operation and construction features among others set forth above. f

The invention is fully disclosed in the following description taken in connection with the accom panying drawing, in which:

Fig. 1 is a side elevational viewof a toolembodying the invention;

Fig. 2 is a top plan view of the embodiment of Fig. 1;

Fig. 3 is a sectional view from the plane 3 3 of Fig. 1 with parts broken away;

Fig. 4 is a sectional View from the plane 4--4 of Fig. 1 with parts broken away;

Fig. 5 is a sectional view from the plane 5 5 of Fig. 1 with parts broken away.

Referring to the drawing, there is shown generally at I a frame comprising an elongated base 2, generally horizontal in the illustrated position of use, a Vertical leg 3 depending from the rearward end of the base, an inclined leg 4 depending from the forward end; the frame thus being generally of downwardly open U-form, and preferably all in the same plane.

An electric motor 5 is mounted on the frame in the corner where the base 2 and leg 3 meet; and with its shaft at right angles to the plane of the frame; and preferably the leg 3 is made separate from the base 2 and both secured, as by screws 6 to a bracket 'I mounted on the motor by screws 8 8. v

j'lhe motor 5 drives a crowned belt pulley Ill, preferably covered by a sheet metal hood II secured to the frame by some of the screws 6.

Elongated parallel handles I2-I3 are provided .L at opposite ends of the motor 5, and spaced therefrom as shown in Fig. 2; and inclined downwardly rearwardlyy as shown in Fig. 1. The preferred construction is to bend a piece of round rod into U-shape, with parallel legs I ll-I 4 and to weld the closed end I5 of the U to the top of manually operable set screw 22. A crowned belt pulley 23 is mounted to rotate on the bracket 2l,v

by an axial bolt 24 of a bearing, and the bearing proper may be a ball bearing of well known type within the pulley and not shown.

On the frame end portion 4, a sheet metal bracket 25 is welded and mounts a crowned pulley 26 by an axial bearing bolt 2l; and this bearing also is of the well known ball bearing type within the pulley and not shown.

The frame is preferably made from square sec-l tion tubing as shown at 3 and 4 in Figs. 3, 4, and 5. This facilitates connecting the motor to it, and keeps the bracket 2l from rotating on the leg 3 and provides a nrm welded joint for the handle at i6, etc, etc.

The three crowned belt pulleys IU, 23, and 2S are all in planar alignment and a closed belt 28 is mounted on them in triangular configuration, and driven by the motor pulley lil, and retained thereon by the crowns of the pulleys in a well known manner.

The pulleys 23 and 2li are disposed so that the belt night 29 between them is at a slight upward forward inclination with respect to the base 2.

The belt 28 is a commercial abrasive belt having abrasive on its outer face as indicated at 36; Fig. 5.

The tension of the belt may be adjusted by adjusting the position of the bracket 2l along the leg 3 as will be understood.

From the above description, it will be seen that an operator may grip the two handles l2-I3 in his two hands at points therealong at which the weight of the motor Ei and of the frame will be supported by his hands and in a substantially balanced condition; that is, the forward portion of the frame including the base 2 and the depending portion i will have a tendency to rock downwardly, by gravity, but will be easily counteracted by the operator. He can thus easily support the tool with the working belt flight 2S in a generally horizontal or` upwardly inclined position, projecting forwardly from him.

To nnish a surface, as referred to, the operator starts the motor E and manipulates the handles to lay the moving belt night 29 on top of the sure face, preferably at the intermediate part of the belt night 29 whereby the belt night will yield or exert a cushioned pressure on the work surface. The operator may adjust this pressure from barely a feather contact pressure to a maximum pressure by simply rocking the handles, with wrist motion as will be understood, to raseor lower the pulley 2S and the belt night 29 at its intermediate working portion.

The arrangement of the handles and the balance of the weight as described makes the adjustment of vthe pressure on the work by the operator extremely sensitive.

Besides raising and lowering the belt flight as referred to, the operator can obviously swing the belt from side to side by the handles to workv a surface of considerable transverse extent without changing the position of his body.

By having the handles I2-l3 far apart as shown, the operator can raise one or lower the other to thereby keep the belt night 29 in nat contact with the work.

The whole tool may be picked up or laid down conveniently as a completely self-contained tool.

The belt can be removed at any time to renew it or replace it with a fresh one or one of dilferent grain, by loosening the adjusting screw 22 and sliding the pulley 23' up along the leg 3; and after putting on a new belt it may be tensioned as desired by the reverse of this operation. The belt is readily removable endwise from the pulleys, the described support for them making this possible. The hood Il over the pulley l provides protection to the operator from nying particles, and its use is optional, but whenv utilized may be removed before removing the belt.

At 3|, Figs. 1 and 2, is indicated a work piece of the kind having a cylindrical surface 32 to be finished by the tool, and it is assumed that it is rotatably supported and rotatably driven by means not shown.

The cushioned yielding of the belt night 29 by pressure applied by th-e operator is indicated by the broken line position of the belt night at 29A.

Changes and modincations may be made in the above described structure such as will occur to those skilled in the art and the invention is comprehensive of all such modifications and changes that come within the scope of the appended claims.

I claim:

l. In a manually portable and operable surface finishing. tool, a frame comprising an elongated base member and a leg generally upright in the position of use, depending from one end portion of the base member, and the base member having a depending base portion spaced from the leg; a motor on the frame at the top of the leg; -a nrst belt pulley driven by the motor; a second belt pulley on a lower portion of the depending leg; and a third belt pulley on the depending base portion; an abrasive belt mounted to run on the three pulleys in triangular configuration driven by the motor, and having a working belt night extending longitudinally between the second and third pulleys for working a surface thereunder; an adjustment for the second pulley to change its position on the leg to tension the belt; a pair of elongated substantially parallel side by side handles mounted on the frame, spaced transversely with respecty to the longitudinal direction of the working belt flight and at opposite sides of the motor, on which the weight of the motor and frame is manually supported and substantially balanced when gripped in the hands of an operator; and the handles disposed so that the working belt flight extends longitudinally away from both handles, and so that when the handles are both rocked in unison around a common handie axis transversely of the longitudinal direction of the working belt night, the belt night will rock bodily around the axis toward and from the work surface.

2. In a manually portable and operable surface finishing tool, a frame comprising an elongated base portion extending forwardly and rearwardly in the position of use; and -a leg depending from a rearward portion thereof; a nrst and a second belt pulley mounted on a lower portion of the leg and on a forward portion of the forwardly and rearwardly extending base portion respectively; a motor mounted on a rearward portion of the base portion, above the nrst pulley and driving a third belt pulley; an abrasive belt of triangular configuration running on the three pulleys and having a working belt night extending longitudinally' forwardly and rearwardly between the first and second pulleys for finishing a work surface thereunder; a pair of spaced apart handles secured to a rearward part of the frame and both above the corresponding rearward end of the working belt night for manually supporting the frame, motor and belt, and the working belt night extending forwardly longitudinally away from both handles; the parts arranged so that the handles may be manually rocked in unison about a common handle axis transverse to the rearward end of the Working belt flight and when so rocked the Working belt flight will rock bodily about said handle axis toward and from the work surface.

3. A manually portable and operable surface nnishing tool comprising: a frame rotatably supporting spaced pulleys; an abrasive belt on the l`pulleys comprising a working belt flight extend- 5 g longitudinally between the pulleys; a belt driving motor on the frame; a pair of side-byside spaced handles on the frame for manually supporting the frame, motor and belt; the handles disposed so that when the belt flight is in a position of use to Work a surface thereunder, the handles are above one end portion of the belt iiight and the belt ight extends longitudinally away from the handles, and so that when both handles are manually rocked in unison in the same direction about an axis transverse to the belt iiight, the belt ight is rocked bodily about said axis toward and from the surface to be worked.

JOHN Y. BLAZEK.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Warner Dec. 27, 1910 Drury Dec. 31, 1912 Erickson Oct. 27, 1931 Hardy May 3, 1938 Fowler Apr. 30, 1940 Fowler Apr. 14, 1942