US1243460A - Portable planing-machine. - Google Patents

Description

0. F. THORN.

PORTABLE PLANING MACHINE. APPLICATION nuzn'nme. 1915.

1,248,460. Patented 0ct.16,1917.

3 SHEETS-SHEET I.

Oacar 177710770 Hiiys O. F. THORN.

FOBTABLE PLANING MACHINE.

APPLKCATION HLED DEC-9.1915.

Lfi wfiwa Patented Oct. 16, 1917.

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4 Invenior 45 050a?" Z? Thorn 0- F. THOR N. PORTABLE PLMHNG MACHINE. APPLICATION FILED DEC-9.1915.

3 SHEETS-SHEET 3- 1,243,460. Patented 0et.16,1917.

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GSGAR F. THOBN, OF CHICAGO, ILLINOIS, ASSIGNOB TO G-ULBRANSEN-DICKINSON COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PORTABLE PLANING-MACHINE.

Specification of Letters Patent.

Patented Get. 16, 1917.

Application filed December 9, 1915. Serial No. 65,927.

' ence being had to the accompanying drawings, forming a part of this specification.

My invention relates to the art of wood working'and is directed specifically to portable planing machines for performing certain kinds of operation upon wood.

In order to describe my invention, I shall refer to a particular use thereof, in connection with which use my invention was developed in an effort to do by machinery what has heretofore been done by hand.

It is well known that in the art of piano manufacture the back of the sounding board is provided with a series of bracing or reinforcing strips glued in position'and disposed parallel to each other in diagonal direction. It is also well known that it is the practice to out down each of the ends of each of these bracing or reinforcing strips in the nature of an elongated chamfer or splay. This operation is most conveniently done, and probably properly done only when the strip are already secured in place upon the sounding board, achisel being used and a templet being employed in order to guide the action of the cutting tool. As previously pointed out, this operation has heretofore been uniformly performed by hand, a tedious practice and one that consumes a great deal of time. Accordingly, my invention provides a portable device which comprises a power-driven rotary cutter which may be applied to, the ends of these strips in rapid succession to splay the ends neatly and uniformly. My invention is illustrated in the accompanying drawings in which; I

Figure 1 shows the back of a piano sounding board;

Fig. 2 shows the manner in which the device of my invention is employed and the structure which I provide for supporting it;

Fig. 3 is an under side view of the machineof my invention;

knives Fig. 4 is a plan view thereof;

Fig. 5 i a side elevational view thereof;

Fig. 6 is an end elevational view thereof; and

Fig. 7 is an interior elevational view.

It will be seen that I provide an electric motor 8, to which the flexible conductors 9, 9, lead, a switch 10 being provided upon the housing of the motor to control the ap plication of the electric current.

The inherent structure and characteristics of the electric motor do not form part of my present invention and it will be understood by those skilled in the art that any adaptable motor may be used.

The motor shaft 11, indicated in dotted line in F ig. 3, is provided with an extension 12 upon which the rotary cutter is secured by means of the nut- 13, the outer end of the extension being journaled in a bearing 14 carried in the wall 15 of a drum housing 16. The other wall 17 of this drum housing is secured to the frame of the electric motor by means of bolts 18, 18, and also by means of bolts 19 which pass through a bracket 20 secured upon the motor frame,

The rotary cutter is best shown in Fig. 7 where it will be seen that it comprises a body 21 which carries four peripheral 22, 22, held in place-by means of clamping plates 23, 23, secured to the body by means of cap-bolts 24, 2 1. The cutting edges 25, 25, are all so disposed that they are equidistant from the axis of the motor shaft and it will be seen that the path in which these cutting edges rotate extends down below the bottom of the drum housing 16. I

The cutter body 21 is provided with a pocket 26 within which, as illustrated in dotted line in Fig. 6 and in full line in Fig. 3, a brake band 27 is disposed, one end of this brake band being secured to a block 28 having arcual adjustment by means of the adjusting screw '29, and being adapted to be held in any adjusted position by means of a clamping bolt 30 passing through an arcual slot- 31. The other end of this'brake band is provided with a block 82 to which a crank arm-33 is connected, this crank arm extending from a crank shaft 3% bearing in the wall 15 and provided outside the hous- 7 determined ing with a crank handle 35. When the crank handle is turned in the direction of the arrow 36, it is clear that the brake band will be expanded within thepocket 26 to brake the movement of the rotary cutter.

Secured to the bottom of the wall l5 is a bracket 37, this bracket being made adjustableby means of the adjusting screws 38, 38, and being held in any adjusted position by means of the cap-bolts 3 of the legs 40, etO, of this bracket carries a caster 41.

Upon the under side of the motor frame a generally similar bracket 42 is provided, this bracket being adjustable by means of an adjusting screw &3 near each end thereof and being held in position by means of a capboltaa at each-end thereof. This bracket 42 carries the casters 45, 4:5 and the arrangement is such that the fourcasters 41 4:1 and 4.5, 45, are adjusted to lie in a common plane and also made adjusta e 80. that the plane which these: casters define lies a predi'sta-nce from the defined path of the rotary cutter.

A hoisting ring 46 is secured to the top oft-he inotor frame. The inotor is provided with a handle 47 and the drum housing 16 is provided with a handle d8, the two handles thus lying opposite each other, and these handles are adapted to be grasped simultaneously in applying the machine to the article upon which work is tobe done. Since the combined motor and cutting device is comparativelyheavy, it is desirable to support the device, at least in part, in order to make it more convenient'to handle, but in iiowise interfering with the portable nature of the structure, In Fig. 2 1 illustrate a rotatingbeam 49 hung upon a pivot Sha 50. suitably suspended-from an overhead rafter 51. The beam .49 is reinforced by guywires52, 52, extending between the ends of; the beam and the hub, of the beam, and the planing'machine is hung from one end of the beam by means of-a hookr0d 53 through the intervention of a resilient element 5%,; The other end of the beam 49 is counterbalanced by means of a weight 55. In the manufacture, which has been described, the sounding board is placed upon a table, back up so as to expose the-bracing orreinforcing strip glued thereon, as; illustrated in Fig. 1. This table is placed under the beam 49 and the resilient element which is employed is of such tension as, to just allow the planing machinelto rest upon the sounding boa-rd in such position. hen it is desired to lift the planing machine the two handles are grasped and in raising the device assistance is given 'bythe resilient element.

"In Figs. 1 and the sounding board is, illustrated at 56,. and the reinforcing or bracing strips at 57, 57. When the strips are 3 Each r glued to the sounding board they are of uniform cross-section throughout their entire lengths and the splaying of the ends is done after the'glue is thoroughly hardened. The'splay is formed by a circular gouge at a short distance from the end of the strip and from the base of this gouge to the end of the strip, the strip is of uniform crosssection, the latter result being secured by planingthe end of the strip outwardly from the base of the gouge and to the depth of the gouge. The depth of the gouge is determined, as before indicated, by the proper adjustment of the casters and the knives, and, once it is determined how far from the end of the strip the gouge shall be, the planing machine is lowered upon the-strip with the rotary cutter in motion and made to descend until the castersengagethebackthe crank handle 3:5 turned toapply the brake.

I claim:

L In combination, a frame supporting a motor having a horizontal extended shaft, a

rotary cutter onthe extended portion of the shaft, a hood for the cutter carried by the motor, reinforcing-means forming port on of said frame and assist ng n supporting said hood, and eooperatingmeans on the hood and frame to regulate the depth of cut..

2. In combination, a frame, a motor in said frame having an extended horizontal driveshaft, a rotary cutter carried by the extended portion of said shaft, a hood for the cutterficarr-ied by the-motor, portions of said frame being extended and connected to said hood to reinforcethe same, andbrackets adjustably carried by the hood and main frame to regulate the depth of cut.

3. In combination, a frame, a m tor in said frame. having an extended horizontal drive-shaft, a rotary cutter on the extended portion of the shaft, a hood for thecutter carried by the motor, reinforcing means forming a portion of said frame and-assisting in supporting said hood, brackets adjustably carried by the hood and rnain frame to) regulate the depth of cut, and casters carried by the bracketsvto permit movement of the machinev from place to P ac l. In combination, amain frame having a prime mover therein provided with an ex:

tended shaft, a rotary cutter on the shaft, a ing the depth of cut carried by the hood and hood for the cutter carried by the prime frame.

mover, handles on said hood and prime In Witness whereof, I hereunto subscribe l0 mover to manipulate the cutter, said frame my name this 6th day of December, A. D. having portions thereof extended to provide 1915.

reinforcing straps, said straps being connected to said hood, and means for adjust- OSCAR F. THORN.

Games of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents, Washington, D. G.

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