US1037939A - Mortising-machine. - Google Patents

Description

J. LEUKART. MORTISING MACHINE. APPLICATION FILED APLZG, 1911.

Patented Sept. 10, 1912.

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J LEUKAgT MORTISING MACHINE.

APPLICATION FILED APR.26, 1911.

Patented Sept. 10,1912.

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WIT/VB Attorney .mcoB LEUKART, or comnvnans, OHid.

MonTr'sINc-MMHINE.

Specification of Letters Patent.

Patented Sept. 10,1912.

Application filed April 26,1911. Serial No. 623,479.

To all whom it may concern:

Be it known that I, JAUOB LEUKART, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Mortising- Machines and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in automatic mortising apparatus and the object in view is to produce a simple and eflicient machine of this nature in which anelongated mortise may be formed in the block or board, the bottom of the mortise being straight and the end of the mortise concaved.

The invention consists further in the provision of an apparatus of this nature so arranged that the feeding of the bit may be automatic and stop mechanism being provided to limit the depth of the mortise.

My invention comprises various other details of construction and combinations and arrangements of parts which will be hereim after fully described and then specifically defined in the appended claims.

I illustrate my invention in the accompanying drawings, in which Figure 1 is a plan View in elevation of one side of the apparatus. Fig. 2 is a. similar view from the opposite side. Fig. 3 is a detail in elevation, parts being broken away. Fig. 4 is a transverse sectional view through the apparatus. Fig. 5 is a detail in elevation. Fig. 5 is a-sect-ional viewtaken on. line 5-5 of Fig. 5. Fig. 6 is a sectional view showing the under face of a detail of the invention, and Fig. 7 is a detail sectional view on line 77 of Fig. 1.

. Reference now being had to the details of the drawings by letter, A designates the frame of the apparatus whichhas clamping screws A mounted in threaded openings therein, the endsof said screws adapted to clamp the opposite faces of the board or block in which the mortise is to be formed.

Rising from said frame are the standards B connected together. at their upper ends by a cross-piece C.

A movable skeleton frame, designated by letter 'D, has bosses D thereon mounted to have a vertical movement upon the standards B, and said skeleton frame carries the operative parts of the machine. arms D forming part of said skeleton frame, have a central hub portion which is apertured for the reception of the shaft E which is stationary and upon which a master gear wheel E, having gear teeth E upon the edge thereof, is journaled and a handle E is pivotally mounted upon said master wheel for rotating the same. The hub portion of the master wheel has a circumferential series of gear teeth E which are in mesh with'the teeth'of a pinion wheel E which is journaled upon a stub shaft E supported by one of said spider arms, and upon the hub of the gear wheel E is a series of circumferential gear teeth E which are in mesh with the teeth of a gear wheel E fixed to a shaft F journaled in one of said spider arms of the skeleton frame, which gear connections form means for transmit-- ting motion from the master wheel to the shaft F.

Fixed to the shaft F is a block G having an elongated slot Gr therein, in which a bearing block G is adjustably held. by means of the set screws G and an integral pin G projects from said block and has a play in the elongated slot II formed in the swinging bit carrying member I, which lat ter has laterally extending recessed bosses I mounted upon the shaft E and a pin K car- Spider ried by said frame D. Said member I is u hollow its entire length and forms a bearing for the rotatable bit-actuating shaftN having a bit N fastened at its lower end. S'plined to said shaft N is a gear wheel N which rotates within a transverse slot formed in the member I- and immediately below the lower end of the slot H and is in mesh with the teeth E of the master gear wheel. Said swinging member is guided in its swinging movements in a slot formed in the cross-piece d of the skeleton frame D.- Upon projections O of said spider arms are mounted pivotal pins 0 to which the lower ends of links 0 are pivctaly connected and their upper ends carry screws 0 which engage interiorlythreaded bosses O which project from the member 0 which latter has acircumferential opening 0 to receive the upper end of the shaft N. Said shaft N has anannular groove N near its upper end in which the inner ends of said screws 0 engage, thus formlng a swlveled connection between the latter and said shaft N.v

The feeding of the bit is produced by the 'following mechanism :A cam, designated by letter Q, is fastened to the shaft F and against said cam an arm R of the angle lever R which is pivoted to the pin R is adapted to ride, and R designates the second arm of said angle lever which is adapted, as the angle lever is rocked, to contact with a pin S projecting from the yoke S through the opposite walls of which the feed screw T is adapted to rotate. Said pin S is adapted to be held within the path of the arm R by means of a coiled spring S mounted about the lower portion of the feed screw, one end of which is fastened to the yoke and its other end bears against said skeleton frame. A spring-pressed pawl S is carried in a hollow projection S of the I yoke and is adapted to engage the teeth of the ratchet wheel S which is fixed to the feed screw. A collar S is fastened to the lower end of the feed screw and has integral ratchet teeth S 8 thereon which are engaged by a dog S which is fastened to the skeleton frame and is provided for the purpose of preventing a reverse motion to the feed shaft. Pivotally mountedupon the pin T which is fastened to the under surface of a cross-piece C, is a plate T having an elongated slot therein for the reception of the pin T which latter passes through said cross-piece and has a nut T upon its upper end. Said swinging plate T has a recessed portion T adapted to engage thethreads of the feed screw, affording means for movingthe frame D and, through the medium of the latter, regulatethe cutting of the bit. In order to limit the depth of the mortise, a etc is provided which consists of a collar which may be held by means of a thumb screw WVf at various elevations upon the bar X which is fastened at its lower end in the frame A and its upper end of the cross-piece C. Said collar is providedv with a laterally extending arm N having a hooked end W which is disposed in the path of the spring-pressed dog S mounted in the V projecting boss upon said yoke S in which the spring-pressed dog is mounted.

The operation of my apparatus will be as follows :-The parts being adjusted in place, a rotary movement of the master wheel will, through the gear connections, cause a rotary movement to be imparted to the bit. A swinging motion will also be imparted to the member I in which the bit carrying shaft is journaled through the medium of the pin Gr upon which pin a sleeve g-is journaled and held thereon by means of a screw Gr and which sleeve moves in the elongated slot H. The adjustment of the block carrying said pin G obviously, will limit the swinging movement of the bit and regulate the length of the mortise. At each revolution of the shaft F, the cam thereon tilting the angle lever will cause an intermittent movement to be imparted to I the feed screw, regulating the cutting of the bit to'form the mortise and, by the peculiar construction of the pivotal connection of the upper end of the bit carying shaft with the boss which swings through the-medium of the links connected thereto, it will be noted that the bottom of the mortise, when completed, will be straight. When it is desired to limit the depth of the mortise, the stop is set at such an elevation upon the rod upon which it is mounted so that the springpressed dog at the outer end of the boss upon the yoke will engage said stop and hold the screw feed from rotation.

VVh-at I claim to be new is 1. An automatlc mortising machine comprising a base, standards thereon, a frame movable upon said standards, a shaft journaled in said frame, a gear wheel fixed to said shaft, a swinging member mounted upon the latter, a bit carrying shaft rotatably journaled in said member, means for impartu'lg a longitudinal movement to the same as 1t 1s rotated, gear mechanlsin intermediato said shafts, means actuated by the gear wheel for causing the bit carrying member to swing upon its pivot, a rotatable feed screw, an adjustable plate carried by the frame and engaging said screw, a yoke fixed tothe latter, a spring upon the feed screw having one end fixed to the yoke and its other end bearing against the frame, a ratchet wheel fixed to the feed screw and mounted within said yoke, a ratchet collar fixed to the screw, a pawl secured to the frame and engaging said ratchet collar, and a spring-pressed pawl carried by the yoke and engaging the ratchet wheel within the latter, a pivotal angle lever, a cam rotatable v with the gear mechanism-for rocking said angle lever, one end of the latter adapted to strikeagainst a projection of an end of the yoke, and means for arresting the feeding movement of the screw.

2. An automatic mortising machine comprising a base, standards thereon, a frame movable upon said standards, a shaft-joun' naled in said frame, a gear wheel fixed to said shaft, a swinging member mounted upon the latter, a bit carrying shaft rotatably j ournaled in said member, means for imparting a longitudinal movement to the same as it is rotated, gear mechanism intermediate said shafts, means actuated by the gear wheel for causing the bit carrying member to swing upon its pivot, a rotatable feed screw,an'adjustable plate carried by the frame and en- 7 gaging said screw, a yoke fixed to the latter, a spring upon the feed screw having one end fixed to the yoke and its other end hearing against the frame, a ratchet wheel fixed to the feed screw and mounted within said yoke, a ratchet collar fixed to the screw, a pawl secured to the frame and engaging said ratchet collar, a spring-pressed pawl carried by the yoke and engaging the ratchet wheel within the latter, a pivotal angle lever, a cam rotatable with the gear mechanism for rocking said angle lever, one end of, the latter adapted to strike against a projection of an end of the yoke, an adjustable stop adapted to be positioned in the path of the projecting end of the pawl within said yoke and designed to stop the feeding movement of the screw.

3. An automatic mortising machine comprising a base, standards thereon, a frame movable upon said standards, a shaft journaled in said frame, a gear wheel fixed to said shaft, a swinging member mounted upon the latter, a bit carrying shaft rotatably journaled in said member, means for imparting a longitudinal movement to the same as it is rotated, gear mechanism inter mediate said shafts, means actuated by the gear wheel for causing the bit carrying member to swing upon its pivot, a rotatable feed screw, an adjustable plate carried by the frame and engaging said screw, a yoke fixed to the latter, a spring upon the feed screw having one end fixed to the yoke and its other end bearing against the frame, a ratchet wheel fixed to the feed screw and mounted within said yoke, a ratchet collar fixed to the screw, a pawl secured to the frame and engaging said ratchet collar, a spring-pressed pawl carried by the yoke and engaging the ratchet wheel within the latter, a pivotal angle lever, a cam rotatable with the gear mechanism for rocking said angle lever, one end of the latter adapted to strike against a projection of an end of the yoke, a bar rising from said base, an adjustable collar upon said bar and provided with oscillating said member, a slot in the frame in which said member is guided as it swings, arms upon said frame, a rotatable bit shaft journaled in said member, a member in which the upper end of said bit carrying shaft is swiveled, links pivotally connecting said member in which the shaft is swiveled to said arms, a pinion fixed to the bit carrying shaft and in mesh with said gear wheel, a feed screw, a spring-pressed yoke fixed thereto, a pawl mounted upon said yoke, a ratchet wheel fixed to the feed screw within the yoke and engaged by said pawl, a ratchet collar upon the feed screw, a pawl fixed to the frame and engaging said collar, and an adjustable stop adapted to be positioned in the path of the pro'ecting end of said pawl carried by the yo e and designed to stop the feed of the screw.

In testimony whereof I hereunto afiix my signature in the presence of two witnesses.

JACOB LEUKART. Witnesses F. A. SIEGEL, A. GEIsE.

Copies of this patent may be obtained for iive cents each, by addressing the Commissioner of Patents,

Washington, D. G.

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