US705324A

US705324A - Wood-cutting machine.

Info

Publication number: US705324A
Application number: US9712702A
Authority: US
Inventors: Joseph A Crismore
Original assignee: Individual
Current assignee: Individual
Priority date: 1902-03-07
Filing date: 1902-03-07
Publication date: 1902-07-22
Anticipated expiration: 1919-07-22

Description

No. 705,324. y, Patented July 22, |902. A. cmsmone. y

WO0D lGUTTING MACHINE. (Appli n filed mr. 7, 1902) (No Model.) 2 Sheath-Sheet 2.,

@7266606 mzarx UNITED STATES PATENT OFFICE.

JOSEPH A. CRISMORE, OF CHICAGO, ILLINOIS.

wooD-cuTTlNc MACHINE.

SPECIFICATION forming part of Len-ers Patent No. 705,324, dated July 22,1902. Application filed March 7, 19025 Serial No. 97,127. (No model.)

To all whom, it may concern:

Be it known that I, JOSEPH A. CRIsMoRE, a citizen of the United States, residing at Chicago, county of Cook, State of Illinois, have invented a certain new and useful Improvement in Wood-Cutting Machines; and I 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 lit pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

Myinvention relates in generalto machines for beveling strips of woodto form miterjoints, and more particularly to machines for cutting the ends of strips of moldings so as to form simultaneously the miter-loevel and the grooves to conformY to the contour of the surface of the molding.

In carpentry it is customary in forming joints between moldings to cut in the end of one strip projections and grooves to engage the raised portions and grooves on the surface of the other strip of the joint. It has heretofore been usual to cut the desired bevel on the end of the strip in one operation and to cut whatis technically known as the coping -that is, the grooves to receive the raised portions of the surface of the other strip of the jointbya separate operation. e

'Ihe object of my invention is to produce a machine for cutting strips of molding so as to form simultaneously the miter-bevel and coping.

A further object of my invention is to provide a machine of the character above referred to which will be simple in construc-y tion, inexpensive in manufacture, and efficient in operation. l

My invention, briefly described, consists in a horizontally-reciprocating blade the crosssection of the cutting edge of which conforms to the raised and rentrant portions of the surface of the molding, the Vdesired miterbevel being produced by adjusting the angular position of the molding with respect to the plane of movement of the blade.

My invention will be more fully described hereinafter with reference to the accompanying drawings, in which the same is illustrated in a convenient and practical form, and in whichby the blade is to engage.

Figure l is. an elevational view of my invention; Fig. 2, a cross-sectional view taken on line 2 2, Fig. 1, looking in the direction of the arrows; Fig. 3, a sectional plan view on a plane below the top bar A3; and Fig. 4, a perspective detached view of one of the supports, a portion thereof being broken away.

The same reference characters are used to designate the same parts in all the figures of the drawings. Reference-letter A indicates a base, preferably composed of cast metal and comprising a horizontal portion and a vertical portion. The vertical portion consists in ends A and A2, connected by a top A3. The arrangement of the ends and top with respect to the horizontal portion of the base is such as to form an opening in which the cuttingblade is adapted to reciprocate. Grooves as a3 are formed in the under surface of the top portionlA3 and in the upper surface of the base immediately below4 the top portion. Within these grooves is guided a support C, to which is secured the cutting-blade. The end edges of the support C are preferably inclined downwardly, so as to converge at their bottoms, as shown inFig. l. e The support C is provided with a horizontally-projecting flange c, in the under surfaceof which are formed gear-teeth c'. The horizontal portion of the base immediately below the iiange c is provided withgear-teeth o. A gear-wheel G is located between the base A and the flange c and is provided with gear-teeth which mesh with the teeth c and a. The gear-wheel G is provided with a laterally-projecting portion g', in which asocket is formed to receive the lower end of a lever G.

The cutting-blade D is secured to the support C preferably by bolts and slots d CZ, as clearlyindicated in Fig. l. Thecutting edge of the blade D is of a cross-section to produce in the molding which it engages grooves and projections" corresponding to the raised and depressed portions in the surface of the molding with which the end portion whichl is cut In the drawings I have shown the blade as consisting in a straight edge d, an offset cutting portion d2, below which is a straight cutting portion d3 in the same vertical plane as the cutting portion d', and a second offset cutting portion IOO d4, below which is a third straight edge d5 in the same vertical plane as the edges d' and d3. The blade D is preferably provided with cutting edges at each side thereof, as illustrated in Fig. 1.

The end portions A and A2 of the base of the machine are provided with grooves a2 and a, located in the path of movement of the odset portions d2 and d4 of the cutting-blade. The surfaces of the end portions A' and A2 above and below and between the grooves a2 and a4 are in the same vertical plane and are so located as to permit the portions d', d2, and d5 of the cutting-blade to pass in front thereof. In order that the strips of molding or other material which is to be cut in the machine may be retained in the path of reciproeation of the blade, adjustable supports B and B2 are provided. These supports are pivoted adjacent to the end portions A/ and A2 of the base, so as to swing from a position at right angles to the plane of the knife toward a plane parallel and adjacent to the blade. These supports may be retained in any desired angular position with respect to the path of the blade by means of screwclamps e engaging groovesf, formed through the horizontal portion of the base. The supports B and B2 may be adjusted so as to vary the angular position of the material which is to be cut with relation to the plane of reciprocatiou of the cutting-blade, thereby determining the degree of bevel of the miter cut.

The cutting-blade may be of a cross-section to conform to the surface of a single strip of molding of predetermined design, or the blade may be provided with cutting portions each of which is adapted to produce a cut edge conforming to a given molding, thereby rendering the machine capable of cutting edges of different design. The cutting-blade illustrated in the drawings is adapted to cut the ends of two dierent moldings, accordingly as the strip to be cutis supported in the plane of the lower half of the cuttingblade or in the plane of the upper half of the cutting-blade. The odset portion d2, for instance, may be designed to cut a coping of one and one-half inches, while the offset portion d" may be designed to cut a coping of one and three-fourths inches.

In order that the material which is to be cut may be supported in position to be engaged by either the lower or upper halves of the cutting-blade, the adjustable supports B and B2 are provided with seats b' and b2, the former of which supports the strip of molding in position to be engaged by the upper part of the knife, while the latter, b2, retains the molding in position to be engaged by the lower portion of the cutting-blade- The operation of my invention is as follows One of the supports B or B2 is adjusted to the desired angular position with respect to the cutting-blade and there secured by means of the clamp-screw c engaging the groove f. If the left cutting edge of the blade is to be used, the support B is adjusted to the desired position, while if the opposite edge of the blade is to do the cutting the other adjustable support B2 is secured in the desired angular position. The end of the strip which is to be cutis then inserted in front of the cuttingblade and held against the adjustable support. The lever G' is then oscillated, which partially rotates the gear G. As the teeth g of the gear engage the fixed rack a, the teeth at the upper periphery move in the direction in which the lever is forced, thereby through the engagement of the teeth on the gearwheelwith the rack-bar c' on the support C sliding the latter in the guide-grooves a3 a3 and causing the cutting edge of the blade, which is rigidly secured to the support C, to remove that portion of the strip of molding which projects beyond the path of movement of the blade. The lever G may then be moved in a reversed direction, thereby rolling the gear through the engagement of its teeth with the fixed rack, which reciprocates the knife to its initial position through the engagement of the teeth on the gear-wheel with the rack-bar c on the blade-support C. When the cutting-blade is adapted to cut two or more different copings, if the lower portion of the blade is to be used the strip of molding is placed directly upon the horizontal portion of the base and rests against the lateral projecting portion b2 of the adjustable support B2. If, however, the upper portion of the cutting-blade is to be utilized, the strip of molding is seated upon the projection b', whereby it is retained in the plane of movement of the upper portion of the blade.

From the foregoing description it will be observed that I have produced a machine for simultaneously cutting a miter and a coping of predetermined design, thereby producing at a single operation that which has ordinarily heretofore been effected by two separate operations. It will also be observed thata miter and two copings of diierent design may be cut upon a single machine by varying the vertical position of the material which is to be cut in the path of the cutting-blade.

While I have described more or less precisely the details of construction, I do not wish to be understood as limiting myself thereto, as I contemplate changes in form, the proportion of parts, and the substitution of equivalents, as circumstances may suggest or render expedient, Without departing from the spirit of my invention.

Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a machine for simultaneously forming miter and coping cuts, the combination with a cutting-blade conforming to the contour of the surface of a molding, of abase upon which the blade is guided having a vertical face adjacent to the path of movement of the blade corresponding to the cutting-surface of the blade, means for reciprocating said blade,

IOO

IIO

and means for 'supporting the molding in the path of the blade.

2. In a machine for simultaneously forming miter and coping cuts, the combination with a horizontally-reciprocating cuttingblade having cutting edges at each end thereof conforming to the contoury of the surface of amolding, of a support to which the blade is rigidly secured, a base upon which said support is guided, means for reciprocating said support, and adjustable means for supporting the molding in the path of the blade.

3. In a machine for simultaneously forming miter and coping cuts, an integral cutting-blade comprising vertically-alined portions conforming to the contour of the surfaces of a plurality of moldings.

4l. In a machine for-simultaneously forming miter and coping cuts, the combination with a cutting-blade comprising verticallyalined portions conforming to the contour of the surfaces of a plurality of moldings, of a support to which said blade is rigidly secured, means for horizontally reciprocating said support, and means for supporting the molding in the path of the blade.

5. In a machine for simultaneously forming miter and coping cuts, the combination with a cutting-blade comprising portions conforming to the contour of the surfaces of a plurality of moldings, of a support to which said blade is rigidly secured, means for horizontally reciprocating said support, and

means for supporting a molding in different horizontal planes in the path of the blade.

6. In a machine for simultaneously forming miter and coping cuts, the combination with a cutting-blade comprising portions conforming to the contour of the surfaces of a plurality of moldings, of a baseupon which the blade is guided having a vertical face adjacent to the path of movement of the blade corresponding to the cutting-surface of the blade, means for reciprocating said blade, and means for supporting a molding in the path of movement of the blade.

7. In a machine for simultaneously forming miter and coping cuts, the combination with a cuttingblade'comprising portions conforming to the contour of the surfaces of a plurality of moldings, of a base upon which the blade is guided having a vertical face adjacent to the path of movement of the blade corresponding to the cutting-surface of the blade, means for reciprocating said blade, a

`pivoted support swinging about a vertical axis adjacent to the plane of movement of the blade, and a plurality of seats carried by said support in different horizontal planes to receive a molding and locate the same in the desired vertical relation to the blade.

Intestimony whereofI I sign this specification in the presence of two Witnesses.

y JOSEPH A. CRISMORE. Witnesses:

J. P. WIBORG, GEO. L. WILKINSON.