US559971A

US559971A - Herman fletcher

Info

Publication number: US559971A
Authority: US
Publication date: 1896-05-12
Anticipated expiration: 1913-05-12

Description

(No Model.)

H. FLETCHER.

GUTTER HEAD.

No. 559,971. Patented MaylZ, 1896.

@7 @au am? iINrTED STATES ATENT Crimen.

HERMAN FLETCHER, OF LOUISVILLE, KENTUCKY, ASSIGNOR TO ELIZA B. FLETCHER, CF SAME PLACE.

CUTTER-HEAD.

SPECIFICATION forming part of Letters Patent No. 559,971, dated May l2, 1896.

Application filed November' 27, 1895. Serial No. 570,268. (No model.)

To @ZZ whom it may @n/cern:

Be it known that I, HERMAN FLETCHER, a citizen of the United States, residing at Louisville, in the county of Jeiferson and State of Kentucky, have invented certain new and useful Improvements in Cutter-Heads; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as Will enable others skilled in the art to which it appertains to make and use the same.

My invention has reference to improvements in cutter-heads for shaping or molding machines; and it consists of certain novel features of construction, which will be hereinafter described, and pointed out in the claims.

The object of the present invention is to construct a reversible rotary cutter-head With independent cutters pivotally connected or hinged to the operating-spindle of the machine and adapted to be shifted automatically7 to present a cutting edge in either direction.

A further object of the invention is to provide suitable eccentrics secured to a spindle and adapted to hold in position pivoted or hinged cutters when reversing the machine and to allow said cutters to roll around the cccentrics, so as to anford sufficient clearance.

A further object of the invention is to provide suitable stops for retaining the cutters in their Working position when automatically shifted through the reversing of the cutterspindle.

A further object of the invention is to provide a single reversible cutter operated by a single eccentric and kept in equilibrium by means of a counterweight.

Referring to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in the various views, Figure l is a central vertical section, partlyV in elevation, of my improved device. Fig. 2 is a plan view of the same with the nut and Washers removed, exhibiting` the cutters in a non- Working position. Figs. 3 and et are respectively plan and section of the left-hand cutter. Fig. 5 represents plan and side elevation of the double eccentrics. Fig. G represents a single cutter With its accompanying counter- Weight, the spindle being in cross-section.

Fig. represents a bottom vieuT of eccentrics secured to the spindle, which is in section, by a feather or key. Fig. 8 represents, respectively, plan and elevat-ion of eccentrics integral with the spindle. Fig. 9 represents plan and elevation of cams or lugs Vscrewed and also riveted to the cutter-spindle. Fig. l0 represents a modification in plan of a lefthand cutter composed of tivo parts and held in position by pins. Fig. ll is a section of the same with the removable part immediately above its normal position, exhibiting the pin-fastening. Fig. l2 is a slight modification of one of the cutters with a portion removed.

My invention consists of a spindle A, provided With a stem a, having flat and rounded parts a and a2 running longitudinally of said stem, the eXtreme end of said stem being provided Wit-h a threaded portion CL3, which is adapted to receive a nut ai for securing cutters D through the medium of sleeves Hand I. Said cutters are mounted on a large collar C, the latter being supported by a smaller collar B. Collar C is provided With stop-pins c and c for engaging the shoulders on the opposite sides of each cutter D and D2 when reversed, as shown in dotted lines, Fig. 2. Collar C, previously referred to,can be substituted for collar I'I, and said pins c and c' depend from said collar C, this position of the collar being preferable with operators on this class of machines. Mounted on spindle-stem a is an integral double eccentric E, comprising eccentrics e and e', which have their bearing upon collar C, and having their lobes or thicker portions directly opposite each other, and are prevented from turning by means of the polygonal opening E' embracing said polygonal stem a.

Stem d can be circular in cross-section and adapted to secure eccentric E by means of a feather e3, as indicated at Fig. 7, and Work equally as Well as the polygonal stem previously referred to.

The cutters D' and D2 are stepped at their Shanks, as indicated at d', (see Figs. l and 4,) and overlap each other, the openings d3 in the cutters embracing or being pivotally connected to the eccentrics e and e', previously referred to. This stepping of the pivotal portion of said cutters is very essential, as the IOO horizontal faces or opposite sides of the same must be parallel, which is necessary when one cutter must follow in the track of the other or preceding cutter. By this meansa hinged joint is formed, which is necessary in my improved cutters, and which will be hereinafter more fully described. It is preferable to have the depth of the combined eceentrics e and e about one-hundredth of an inch longer than the height or depth of the overlapping portions d' of said cutters, so that the impinging collars H and C may be iirmly seated against said eccentrics, thus allowing said cutters to swing in a horizontal position free from the collars previously referred to.

When necessary to reverse the machine or cutter-head, the operator shifts the belt on the driving-pulleys, (which are of ordinary construction and not shown in the drawings,) which consequently turns or revolves spindle a in the opposite direction, and as stop-pins c and c revolve with said spindle d they come in contact with the opposite sides of said eutters and cause them to revolve in the same direction with said spindlea.

It will be observed that the cutters D' and Dg in Fig. 2 are directly opposite each other and held in this abnormal position by the eX- treme throw of vsaid eccentrics. (See eccentrics in Fig. l.) They are shown in this position to indicate that they are concentric with the dotted line Z. The extreme cutting edges d of said cutters are situated on said dotted line Z when cutting in either direction. ln Fig. 2 they are cutting in the direction of the arrows, said cutters being shown in working position in dotted lines. It Will be observed that the rear end of each cutter, as indicated at (ZT, is some distance from the peripheral line Z, which indicates the clearance of the heels of said cutters, proper clearance being maintained throughout the use of the same until they are cast aside for want of strength, caused from frequent grinding. rlhe cutters are held in this position by means of the stops c and c' previouslyreferred to, and when necessary to reverse said cutters they are shifted against the opposite sides of said stops c and c, and that which is considered as clearance at (Z7 will disappear, this edge of said cutters will become flush, with the dotted line Z becoming the cutting edge, and CF will be indicated at the opposite side or end of said cutters when reversed as d6. This clearance (ZT is obtained by means of said cutters D and D?, rolling around said eccentrics e and e', previously referred to. Said eccentrics c and e', which are integral, as previously stated, can work equally as well if separate.

It is obvious from the construction of my improved cutters that there is no danger to be apprehended from the same becoming detached from their spindle irrespective of the speed acquired, nor is there any necessity to manipulate them in any respect when nocessary to reverse to cut in an opposite direction, as the operator merely reverses the spindle in the ordinary manner, the cutters reversing themselves automatically.

l have provided a sectional cutter, which is bisected and removably secured by dewelpins, as shown in Figs. l0 and l1, which by partially removing nut di the semicircular portion dl@ can be released from the other portion, being held in place by means of pins du. This device may have some merits, when frequent grinding of the cutters is required, as a time saver. In Fig. 12 a portion d" of the periphery of the pivotal or hinged part has been removed, sufficient arc of contact, however, remaining, which will operate in a similar manner to the cutters previously referred. to. Fig. Gis similar in construction as regards the cutters previously referred to, except as to the action, there being only one cutter D used at one time and operated by a single eccentric. The opposite cutter D3, which is secured to or integral with cutter D, acts as a counterweight and of course is diametrically opposite said cutter-D. ln this case the cutter D3 is shown, as indicated at D1, secured by a pin.

vWhen necessary to use D3 as a cutter and cutter D/ is to be employed as a counter-weight, both cutters are removed from the spindle and the counterweight-cutter:D3 is turned around, so that the swell or lobe of the eccentrics will operate upon it in a similar manner as in the present position upon cutter D'. Of course this only occurs when cutter D' becomes too much worn from grinding the same, when it will act as a counterweight. The clearance d8 between counterweight D3 and line Z is caused by the single eccentric drawing it away from said line.

Having described my invention, that which I desire to secure by Letters Patent of the United States is l. The combination with a spindle of eccentrics, a polygonal opening in said eccentrics through which the spindle passes, said eccentrics passing through the shanlis on cutters the whole being constructed and adapted to shift the position of the cutters to operate in either direction of rotation, substantially as described.

2. The combination with a spindle and eccentrics through which the spindle passes, of cutters, shanlis on the cutters mounted upon eccentrics, the whole being constructed and adapted to shift the cutters to operate in either direction of rotation substantially as described.

3. The combination with a spindle passing through eccentrics, cutters having shanks surrounding said eccentrics, and stop-pins mounted on a collar for limiting the cxtreme movement of said cutters, when necessary to operate in either direction of rotation, as described and specified.

et. The combination with a polygonal spindle passing througheccentrics, cutters having shanks surrounding said eccentrics, said cutter-Shanks overlapping each other for the IOO IIO

purpose as specied, and stop-pins mounted on a collar for limiting the shiftability of said cutters, when operating;` in either direction of rotation substantially as described.

5. The combination with a spindle passing,` through eccentrics of the kind as shown and described, cutters having bisected shanks for surrounding,` said eccentrics, and stop-pins for limiting the extreme shiftability of said cutters, when operated in either direct-ion of rotation, as specified.

G. The combination With a spindle passing through eccentrios, cutters having' bisected shanks surrounding said ecoentrics, said cutter-Shanks provided with flowel-pins: stoppins for limiting the movement of said cutters when operated in either direction of rotation, as described and specified.

7. The combination with. cutters having,` shanks with annular openings, said cutters embracing by said annular openings, integral eccentrics,and a vertical shaft or spindle passing through said eccentrics for the purpose as shown and described.

In testimony whereof I afx my signature in presence of two Witnesses.

HERMAN FLETCHER. lVitnesses W. REEs EDELEN, J. Ross CoLHoUN.