US586393A - Mortise and marking gage - Google Patents

Description

(No Model.)

`L.1LPY1\ITE1\I. MORTISE AND MARKING GAGE.

No'. 586,393. Patented July 1-3, 1897.A

dwf/J UNTTED STATES PATENT OFFICE.

LARS H. PYNTEN, OF BALTIC, SOUTH DAKOTA.

MORTISE AND MARKING GAGE.

SPECIFICATION forming part of Letters Patent No. 586,393, dated July 13, 1897.

Application filed July 15, 1896. Serial No. 599,257. (No model.)

To coll whom, it 77u07] concern:

Be it known that I, LABS H. PYNTEN, a citizen of the United States, residing at Baltic, in the county of Minnehaha and State of South Dakota, have invented a new and useful Mortise and Marking Gage, of which the following is a specification.

This invention relates to a new and useful mortise and marking gage, and has for its object to provide a device of this description by means of which the guide-lines for the mortise or tenon may be inscribed and the marking-points of which may be adjusted with reference to an auger-bit, so as to transfer its exact width to the material to be operated upon.

In some gages of ordinary construction the outside lines only are marked and the distance between the same is determined by measuring with a rule, and in practice it is next to impossible to lay out lines by this method sufficiently accurate to permit the workman to bore a hole the full width of the mortise to be formed, thus necessitating considerable chiseling, which requires both time and skill, and as no central line is provided which is accurate relative to the side lines it is a matter of guesswork to place the screw of the auger in the exact center of the side lines, but by the use of my improvement not only are the side lines inscribed at the exact width apart of the diameter of the auger, but the central line is also inscribed at the same time, which facilitates the placing of the starting-screw of the auger in its proper relative position to the side lines, and this is accomplished mechanically without calculation or measurement by the operator.

Vith these ends in view this invention consists in the details of construction and combination of elements hereinafter set forth,and then specifically designated by the claims.

In order that those skilled in the art to which this invention appertains may understand how to make and use the same, its construction and operation will now be described in detail, referring to the accompanying drawings, forming a part of this specification, in which- Y Figure lis a side view of my improvement, showing it in operation; Fig. 2, a perspective thereof, illustrating its construction; Fig.

3, a detailed view of the three markers used in my improvement; Fig. 4, a section through the gage-block, illustrating the method of holding said block in its adjusted position; and Fig. 5 a diagrammatical view of the inscribed lines and auger placed in relation thereto, illustrating the manner of centering said auger by said lines.

Referring to the drawings indetail, A and B represent the two end blocks, in which are secured the guide-rods O, which are four in number, and j ournaled within the end blocks is a screw-rod D, which is provided with a thumb-knob E, by which said rod may be turned upon its axis in either direction for the purpose hereinafter set forth.

The rod D is provided with right-handed threads F and left-handed threads G, between which is a blank portion H, and the firstnamed threads pass through the threaded hub of the marking-disk I, and threads G likewise pass through the threaded hub of the marking-disk J, so that when the rod D is revolved, as before described, these markingdisks will be moved to and from each other, as the case may be and as is well understood in the use of right and left handed screws.

The marking disks have holes formed therethrough for the passage of the guiderods O, by which arrangement said disks are prevented from turning upon their axes and guided in their longitudinal movement. A stationary disk K is secured upon the guiderods and has a central opening therethrough for the passage of the screw-rod and this disk is so located that the blank portion H of the screw-rod lies within its central opening.

The gage-block L is provided with holes for the free passage of the guide-rods C, and also a central hole M of sufficient diameter to permit the passage of the screw-rod D, and in order that this block may be held in any adjustment upon the guide-rods a set-screw N is threaded therethrough, so that its end may bear against two of said guide-rods, and this screw is provided with a knurled head O to facilitate its operation. From this it willbe seen that the gage-block may be adjusted and held in yany adjustment for the guidance of the marking-disks relative to the edges of the material to be operated upon, as shown in Fig. l.' The marking-disk lhas two flattened ICO sections P, and the disk K one of such section Q, while the periphery of the disk J is a complete circle, so that when it is desired to inscribe only one line the device may be so turned as to cause the flattened portion Q of the disk K and one of the flattened portions P of the disk I to lie next the surface to be marked, thus cutting out the action of the disks I and K, but permitting the disk J to perform its function, and when it is desired to inscribe two lines the gage may be so turned as to cause one .of the flattened portions P of the disk I to lie neXt the su rfaee to be operated upon, while the marking edges of the disks J and K are permitted to act upon saidsurface. j

A gage built in accordance with my improvement has many advantages, among which is the fact that it can be set by placing the marking-disks in conjunction with the auger or other boring-tools and operating the rod D, so as to bring said markers into alinement with the outer edges of said auger after the manner of gaging the diameter of a tool, when lines may be inscribed upon the surface to be operated upon, which will determine the width of the hole to be bored, and at the same time the central marker will inscribe a line midway between the two sidelines, and this central line is of use in locating the auger, since the starting-bit of said auger may be placed thereon, and again when the gage has once been set for'the mortise it may also be used for outlining the tenon, and the two will therefore exactly correspond, thus greatly reducing the time heretofore spent in laying out this class of work,as well as increasing` the accuracy of the completed work. Another advantage of this arrangement is that when a tapering tenon is to be produced the central line inscribed by the marker K may be utilized to determine the pitch of the side lines relative thereto, thereby securing the saine angle of taper upon both sides of the tenon,

In practice a gage built in accordance with my improvement operates more smoothly and accurately on account of the three markers acting at one time upon the surface of the wood, thereby overcoming the tendency of the grain to throw the marker out of line, since i the three markers will not at one time fall upon grains of the same irregularity.

In assembling myimprovem ent the markers are first screwed on the rod D, then the guiderods passed through the holes in the markers, then the movable head L put on the rods, and, lastly, the blocks A and B are put on said rods and there held by clenching the ends of said rods, the blocks being countersunk to facilitate this operation.

The rod D is provided with a washer at either end thereof outside of the blocks A and B in order that it may be held against longitudinal movement within said blocks, the

knob E being the last piece secured in place.

In practice I have found that a gage built in accordance with my improvement maybe operated in half the time required for accomplishing the same work with other gages.

Having thus/fully described my invention, what I claim as new and useful is- 1. Amortise and marking gage, consisting of guide-rods, end blocks to which said rods are secured, a screw-rod journaled within the end blocks, said rod having right and left handed threads formed thereon, adjustable marking-disks of different shapes adapted to slide upon the guide-rods and be actuated by the screw-rod, and lastationary,marking-disk located equidistant from the rst named disks, as specified. i

2. In a mortise and marking gage, a series of guide-rods, end blocks to which said guiderods are secured, a gage-block arranged to slide upon the guide-rods, a set-screw forholding said block in its adjusted position, a screwrod journaled within the end blocks, said rod having right and left handed threads formed thereon, the disks I and J adapted to slide upon the guiderods, said disks having internally-threaded hubs for engagement with the threads upon the screw-rod, and a stationary marking-disk secured upon the guide-rods equidistant from the disks I and J, said disks being of different shapes substantially as and for the purpose set forth.

3. In a gage of the character described, a series of guide-rods, end blocks for holding said rods parallel with each other, a threaded rod D journaled within the end blocks, right and left handed threads F and G formed upon said rod, marking-disks I and J, each having an internally-threaded hub adapted to receive one set of the threads, a disk K secured upon the guide-rods midway between the disks I and J, said disks being of different shapes, a knob E for operating the rod D, a gage-block adapted to slide upon the guide-rods, and a setscrew N for holding said block in any adjustment, substantially as shown and described.

4. In combination with the guide-rods of gages of the character described, the disks I, J and K arranged upon said rods, the disk I having two flattened portions, and the disk K one ilattened portion, substantially as and for the purpose set forth.

5. A gage having scratch-points composed of three disks slidable thereon, the first of said disks having two flattened portionsin its per-` 'imeter and the second having one flattened portion in its perimeter registering with one of the flattened portions of the first disk, substantially as described.

In testimony whereof I have hereunto affixed my signature in the presence of two subv scribing witnesses.

LARS II. PYNTEN.

IVitnesses: y

EDWARD NELSON, T. J. QUEsToEL.

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