US478544A - And edward cheshire - Google Patents

Description

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H. J. CORDBSMAN & E. CHBSHIRB. DOVBTAILING MAGHINB.

No. 478,544. Patented July 5, 1892.

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H. J. GORDESMAN an BfoHBsHIRE. DVETAILING MACHINE.

No. 478,544. l Y Patented July 5, 1892.

UNTTED STATES PATENT OFFICE.

HENRY J. CORDESMAN, OF CINCINNATI, OHIO, AND EDWARD CHESIIIRE, OF

'COVINGTON, KENTUCKY, ASSIGNORS TO THE CORDESMAN MACHINE COM- PANY, OF CINCINNATI, OI-IIO.

DOVE'TAILING-MA'CHINE'.

SPECIFICATION forming part of Letters Patent No. 478,544, dated July 5, 1892. Application filed April 2s, 1891. serial 110.390,202. (roman.)

To all whom it may concern:

Be it known that we, HENRY J. CORDESMAN residing at Cincinnati, in the county of Hamilton and State of Ohio, and EDWARD CHESHIRE,

residing at Covington, county of Kenton, and State of Kentucky, citizens of the United States, have invented anew and useful Dovetailing-Machine, of which the following is a specification.

ro Our invention relates to an improvement in dovetailing-machines wherein the longitudinal reciprocating movement of the chuck for holding the boards to be dovetailed and the lateral or transverse movement for spacing the dovetailing of the guide-frame and chuck are accomplished by the reciprocation of a single lever. We attain this object by the mechanism illustrated in the accompanying drawings, in whichzo Figure l is a central vertical longitudinal section of a dovetailing-machine with our device attached thereto, the uprights or supports for the table being omitted. In this View the chuck is shown in its retracted po- 2 5 sition. Fig. 2 is a similar view showing the chuck in the forward positionin engagement with the cutter-head. Fig. 3 is a rear end elevation. Fig. 4 is a detail bottom plan View of the mechanism for effecting the lateral 3o movement of the chuck. Fig. 5 is a similar view showing the reverse position of the parts. Fig. 6 is an enlarged sectional view on line 6 6, Fig. 5. Fig. 7 is a perspective view, partly in section, of the table, chuck, 3 5 and means for operating the same.

Similar letters referto similar partsthrou ghout the several views.

The lever K, hereinafter referred to, may be secured upon either end of the shaft J or 4o shifted from one end to the other to suit the convenience of the operator. Thus in Figs. l and 2 it is shown upon one end of the shaft, while in Fig. 3 it is shown upon the opposite end. In like manner the shifting-rod P may be arranged to operate from either side of the bed-plate, it being shown upon one side in Figs. 3, 4, and 5 and upon the opposite side in Fig. 7.

As illustrated in the drawings, the chuck is 5o designed to hold two pieces, one vertically and the other horizontally, cutting tonguesin one piece and. grooves in the other at one operation.

A represents the table, supported at aconvenient height upon standards in the usual manner. 1

B B represent bearings,inwhich is stepped the cutter-shaft C, provided with pulley C and surmounted by cutter-head c, and arranged to be adjusted vertically, according 6o to the depth of cut desired, all of which is of usual construction. At the rear end of table A is provided a groove a, which en gages web d of the traveling bed-plate D, which with the weight of the bed-plate serves to hold it in place and guide it in its lateral movements across the table.

E is the chuck in which the boards O and O are held, said chuck bei ng fitted .into guideframe D in dovetailed grooves d d in a usual manner. The lower part of chuck E is provided with a level and smooth surface-plate E', necessarily parallel with table A. From this surface-plate arise two vertical side pieces E2, which again are united by crossplate E3, the face of which is at a right angle with horizontal plate E'. At the intersections of these side pieces E2 with cross-plate E3 are provided lugs e, which are bored and provided with adjustable standards F F, held in posi- 8o tion by set-screws, as seen in Figs. 1 and 2. The heads of the standards are provided with oblong perforations which serve as a support or bearing for the shaft G.

G G are adjustable connecting-rods connecting the cross-plate or follower G2 to the eccentric-pins g g of shaft G. The horizontal board is clamped in position on the plate E by rotating the shaft G, which forces the connecting-rods and cross-plate down upon 9o the board. The vertical-faced plate E3 is also provided with suitable follower consisting, simply, of an eccentric-shaft H, and which 1s also made adjustable by means ofscrews and springs for any reasonable thickness of board. Eccentric-shafts G and H are both provided and operated by suitable levers g and h. The end pieces E2 are further provided with eyes c e', which serve as bearings to shaft J which has attached thereon two arms I I, and also roo trol all movements of the chuck. The lower and rounded end of arms I I engage between lugs or bearings D' of guide-frame D and are for the purpose of establishing the longitudinal reciprocating motion of chuck E and incidentally the lateral movement of the frame D and the parts mounted thereon.

In Figs. 4 and 5 is illustrated the mechanism by which the lateral movement is effected. N represents a spacing-rack, which is secured to and slides laterally on the under side of plate E. N represents ribs cast or rigidly secured to the under side ofrplate E', thus forming a stationary counterpart of the rack N. The rack N is reciprocated by one or other of the bell-crank levers M, which are pivoted at m to plate E. A represents a friction-roller journaled to a stud on table A. (See Figs. 1 and 2.) The roller A engages in one of the grooves of the rack N N P is a shifting-bar secured to the rear face of the frame D b y a bolt q and thumb-screw q', passing through slots p and p'. p2 represents a lug projecting from the shifting-bar P and having at its inner end a rod p3, upon which is mounted a dog or tripping device P', which is recessed to receive a spiral spring S. s represents a pin passing through the end of rod 193 to hold the spring in place. p4 represents ears projecting from the dog P' to engage lever M at one end of the stroke while the lug p2 engages it at the other. The bell-crank levers M, as shown in Figs. 4c and 5, are secured or pivoted to the under side of chuck E by centers m. The bar P is shifted backward and forward to engage either one or other of levers M, according as it is desired to feed to right or left hand. E4 represents a rack, either a part of or secured to plate E. It serves as a support for the forward end of the boards, the cutter-head passing into the grooves in making a cut.

The operation is as follows: When the chuck is in the backward position, Figs. 1 and 4, ready to feed forward, the roller A' engages one of the grooves of the rack N. Upon feeding the chuck E forward toward the cutter the roller A passes out of rack N and into rack N. At the end of the forward stroke, Figs. 2 and 5, the dog P', which is mounted on frame D and does not move longitudinally, engages the lever M and throws the rack N over, so that the next groove to the one in which the roller was last engaged comes opposite the groove in rack N in which the roller is. The backward movement of the chuck now commences and continues until the roller A has passed back into the rack N, but into the groove next to the one in which it was last engaged. At the end of the backward movement of the chuck leverM engages the lug p2, tending to and apparently throwing the rack in the opposite direction. As, however, the roller A holds the rack in place, the frame D yields and slides laterally the distance of one spacein the rack N. This is repeated at each reci procation of the chuck until the roller A reaches the end of the spacing-rack N. Thus one forward and backward movement of lever K cuts one dovetail and puts the machine in position. for the succeeding cut. As the stroke of the chuck varies with dierent thicknesses of material, the spring S is provided to take up any movement greater than the minimum longitudinal stroke. t.

What we claim as our invention, and desire to secure by Letters Patent, is

l. In a dovetailingmachine, a laterallysliding bed-plate resting upon the machinetable, a reciprocating chuck thereon and` means for reciprocating the same, a rack N, rigidly secured to said chuck, and a reciprocating rack N', with means for engaging the successive teeth of said rack with a stud or projection upon the machine-table by the reciprocating motion of the chuck, substantially as specified.

2. In a dovetailing-machine, the combination of table A, provided with boss A', alaterally-sliding bed-plate mounted onsaid table, the reciprocating chuck E and means for reciprocating the same, the sectional rack N N', secured to said chuck, and means for reciprocating one of the sections of said rack with the reciprocating movement of the chuck to successively engage the several teeth of said rack with the boss A', substantially as and for the purpose specified. j

3. The combination, substantially, of table A, provided with ways or guides in which are mounted the laterally-sliding bed-plate D, the chuck E', reciprocating thereon and carrying racks N N' and lever M, and dogging devices p2 P', secured to the bed-plate, whereby the rack N' is reciprocated with each reciprocation of the chuck to engage the successive teeth thereof, with a boss or projection upon the table A, substantially as specified.

HENRY J. CORDESMAN. EDWARD CHESHIRE.

Witnesses:

FRANCIS M. BIDDLE, J. l. DE CAMP.

ICO

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