US1538987A - Maecxjs gullholm - Google Patents

Description

' May 26, 1925.

M. GULLHOLM WOODEN DOWEL PIN CUTTER Filed 001'.

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lVflRcUs GULLHOLM Patented May 26, 1925.

MARCUS GULL I-ZOLM, OF ST, PAUL, MINNESOTA.

WOODEN-DOVEL-IIN CUTTER.

Application filed October 1, 1924. Serial No. TQLOOQ.

To 6; whom it may concern Be it known that I, Marcus GUL HQLM, a citizen of the United States resident of St. Paul, county of Ramsey, and State of liiiinnesota; haveinvented certain new, and

useful Improvements-in lvooden-Dowel-Pin Cutters, of which the following is a specification. r

This invention relates to improvements I in devices or tools designed particularly for use in cutting or turning wooden dowelpins ofcircular cross-section, such as are commonly used in wood-working shops in male ing wooden models or patterns, and also in furniture factories in the construction of furniture and various other wooden articles, and more particularly relates to such devices which are manually operable in conjunction with a turninglathe wherein the work or stick to be turned is rotated.

The particular object of the invention is to provide a wood dowel pin cutter having 2 thereby providing a wide range of adjustment to adapt the tool for turning dowel pins of varying s1zes; the aws also having a long bearing surface on the stick from which thepins are turned to aid in guiding the tool in the progress of the work.

A further'object of the invention is to provide a dowel pin cutterof simple and inexpensive construction so designed that it may readily and quickly be adjusted to meansTwhereby it maybe-positively locked in-such adjusted positions.

Other objects of the invention will more fully appear from'vthe following description I and the accompanying drawings and will be'pointed out in the annexed claims.

In the drawings, there has been disclosed a .structure designed to carry out the variousobjects of thei invention butit is to be understood that the invention is not confined. to the exact features shown as various changesmay be made withinthe scope of the claims which-follow. Y i

In the accompanying drawings forming a part of this specification,v

Figure 1 is a view insid elevation of my improved dowelpincutter, showinga dowel pin posltioned between the interlock- 1l1g']LWS thereof;

clamped and 'jaws capable of lapping each other and cut difi'erentsized dowels, and also having,

Figure 2 is a plan View of Figure 1 with the handle. broken away;

.Figureg3 is a cross-sectional view on the dotted lines how the jaws'may be adjusted to dowels of different diameters;

Figure 5 is" a side view of a modified form of cutter; and

Figure 6 is a plan view of Figure 5 with the handle broken away.

The novel dowel pin cutter shown in the accompanying drawing comprises a stationary frame 11 having oppositely extending ears or lugs 1 2, preferably integrally formed thereon to which a pairof rods 13 are secured and. arranged in spaced parallel relation as particularly shown in Figures 1, and 4c. Oneend of each rod is preferably turned down as indicated at 14 so that they may be secured to th ears 12 by upsetting the end of the rod as shown. A similar frame 15, having inte ral lugs 16 provided on each side there0f,,is slidably mounted upon the rods 13 by means of suitable. apertures provided in the" lugs 16 as shown. A plurality of spaced parallel fingers 17 are provided on the franieill and similar fingers 18 are provided on the slidable frame 15. The fingers 17 and 18 on the two frames 11 and 15, respectively, are alternately arranged thereon-so that they will lap by oneanother to form a guide or bearing for the dowel pin when: the frame 15 is moved towards the stationary frame 11, as shown in Figure 1. By this novel construction it will be seen that the opening provided between the fingers 17 and 18 may be adjusted to dif-' ferent; sized dowelfpins and, being substantially square in form, will provide a four of the fingers 17 and 18 are preferably beveled, as indicatedatQO so as toprevent the corners thereof from marring the surface of the dowel pin.

An outwardly projecting lug 19 is preferably provided on one side of the slidably mounted frame 15 to provide a support for. a bit or ltnife blade 21 secured thereto byv means ofa setscrew 22 mounted in a complementary lug 23 arranged in spaced parallel relation to the lug 19. Thus, it will be seen by referring to Figure 1, that when the blade 21 is interposed in the gap between the two lugs 19 and 28, and the screw 22 is rotated in its threaded seat it will engage the blade and securely hold it in place, and by loosening the screw 22, the blade may be adjusted to th proper cutting angle with respect to the work or stick being turned to form a cylindrical dowel pin. As shown in Figure 2, the cutting edge 24 of the knife blade is preferably curved or inclined with reference to the axis of the dowel pin so that a shearing cut will be obtained which will leave the surface of the dowel pin, when completed, smooth and clean. The knife blade 21 may also readily be removed from its mounting for sharpening or replacement. 7

The means provided for moving the slidable frame to and from the stationary frame 11 preferably consists in the provision of a threaded stem 25 mounted in a threaded bearing 26 provided in a cross-head 27 which is suitably secured to the ends of the two rods 13 by such means as the pins 28..

One end of the stem 25 preferably has an annular groove 29. cut therein so as to form a head 31 which is seated in a socket 32 provided in the frame 15. A small plate 38, having a fork 34 at one end thereof adapt ed to be fitted in the groove 29 of the stem, is secured to the frame 15 by a screw 35 as shown in Figure 3. The plate 33 functions to prevent the stem 25 froni'becoming means preferably consists in the. provision disconnected from the frame 15- and at the same time to provide a'connection between the frame and stem which will Permit the latter to be rotated when it is desired to move the frame 15 and therefore the fingers 18 with respect to the stationary frame 11 and fingers 17; Y

A suitable handle or knob 36 is preferably secured to the outer end of the threaded stem 25 so that the stem may readily and conveniently be rotated to adjust the device to the diameter of the dowel pin to be cut. A locknut 37 is also preferably provided so that the stem 25 and therefore the slidable frame 15 may be locked in adjusted position so' that the diameter of the dowel pin being cut will be constant and true.

Means are provided on the stationary frame 11 to guide thework into the jaw formed by the fingers 17 and 18. Such of an outwardly projecting lug or flange 38 formed on the leading side of the frame 11 as shown in Figures 1 and 2. This flange 38 has an inclined surface 89 adapted to be engaged by the work or stick when inserted into the jaw formed by the fingers 17 and 18. The upper central portion of the inclined surface 39 terminates at the corner or edge of the opening provided between the fingers so that when a stick is inserted in the jaw, a corner thereof may engage the inclined face 39 which will guide the end of the stick into the jaw.

In Figures 5 and 6, there is shown a dowel pin cutter of modified construction comprising a frame 41 having an integral handle 42 provided on one end thereof. A plurality of spaced parallel fingers 43 are arranged at an incline at the opposite end of the frame 41 and these fingers are adapted to cooperate with a plurality of similar fingers 44, mounted on a slide 45, to provide a guide or bearing for the dowel pin as shown. The slide 45 is adjustably mounted in a recess 46 provided in the frame 41 and is secured thereto by means of a screw 47 and wingnut 48.

Figure 6, the fingers 43 of the frame 41, and

also the fingers 44 on the slide 45, are arranged in staggered relation so that they will lap by or pass between one another in amanner similar to that shown and described with reference to the previous figures, A knife blade 51, similar in construction to the blade 21, ismounted on a lug52 provided on the frame 41 and is secured thereto by a screw 53 passing through a slot 54 provided in the blade as particularly showninFigure 6.

In the operation or use of this novel dowel pin cutter the work or stick to be turned is preferably mounted in the chuck of an ordinary lathe and is rotated thereby. The operator will then open the jaw of the cutter by rotating the threaded stem 25 until the stick may be inserted between the oppositefingers 17 and 18. He will then adjust the position of the fingers l7 and 18- with relation to one another until the knife 21 engages thestick and reduces it to the desired diameter after which the stem 25 and therefore the carriage 15 will be looked in position by means of the locknut 37. The cutter is then-manually moved along the stick towards the lathe chuck as shown in Figure 2. Duringsuch movement of the cutter the rectangular opening provided between the interlocking fingers 17 and 18 will form a guide or hearing to support and guide the tool during the cutting operation.

From the foregoing, therefore, it will be seen that dowel pins of various diameters may be readily cut with the same tool and without changing the size of the knife blade used. therewith. It is therefore of particular advantage in small wood-Working shops employing dowel pins in the construction of patterns, wood models and various other wooden articles, as by its use it is not neces The slide 45 preferably has a slot 49 provided therein to receive the screw 47 so sary to carry a large stock of dowel pins, as such pins may be readily cut from time to time as needed from scrap pieces of material. 4

I claim as my invention:

1. A device of the class described com prising a stationary jaw composed of diverging members, a movable jaw also composed of diverging members between which and said stationary jaw the stick to be turned is placed, the jaws sliding back and forth on the stick as it is turned and said jaws providing a comparatively long guiding and bearing surface therefor, and a knife mounted upon one of said jaws to engage the surface of the stick between them.

2. A. device of the class described comprising a stationary jaw composed of aplurality of diverging fingers, a. movable jaw also composed of diverging fingers cooperating with the lingers of said stationary jaw to form an opening to receive a polygonal stick, means for opening or closing said jaws to increase or decrease the opening between them, the fingers of one jaw passing between those of the other jaw during the closing movement and providing a wide range of adjustment, said jaws sliding upon the stick as it is turned and a knife carried by one of said jaws.

8. A. device of the class described comprising a frame having parallel guides, a stationary jaw having diverging members, a movable jaw mounted to slide on said guides and having an adjusting screw provided with a hand grip, said movable jaw also having diverging members between which and said stationary jaw members the stick to be turned is placed, said frame and jaws sliding back and forth on the stick and a wood cutting knife mounted to engage the surface of the stick.

i. A device of the class described comprising a stationary jaw composed of diverging members, a movable jaw also composed of diverging members betweenv which and said stationary jaw the stick to be turned is placed, the jaws sliding back and forth on the stick as it is turned and providing a comparatively long guiding and bearing surface therefor, a knife mounted upon one of said. jaws to engage the surface of the stick between them and one of said jaws having an inclined surface for contact with the end of the stick to guide it into the opening between the jaws.

5. A device of the class described comprising relatively movable jaws, each composed of a series of diverging fingers arranged in groups, the fingers of the same group being spaced apart in parallel relation and the fingers of one jaw being adapted to pass between the opposite fingers of the other jaw and thereby provide a comparatively wide range of adjustment to increase or decrease the size of the opening betweenthe jaws, said jaws being adapted to slide upon the stick as it is rotated between them and having a plurality of guiding bearings on the surface of the stick, and a knife blade having a cutting edge mounted to engage and turn the stick to a form circular in cross-section as it is rotated.

6. A device of the ciassdescribed comprising relatively movable jaws, each composed of diverging members between which the stick to be turned is inserted, the jaws sliding back and forth on the stick as it is turned and providing a comparatively long guiding and bearing surface therefor, and a knife mounted uponone of said jaws to engage the surface of the stick between them.

In witness whereof, I have hereunto set my hand this 27th day of September 1924.

MARCUS GULLHOLM.

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