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Full text of "Machine For Mortising Timber, &c. - United States Patent 685"

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Ira Mclaughlin, Of Sunderland, Vermont. Machine For Mortising 
Timber, &c.

Specification of Letters Patent No. 685, dated April 7, 1838.

To all whom it may concern:

Be it known that I, Ira Mclaughlin, of Sunderland, in the county 
of Bennington and State of Vermont, have invented a new and 
Improved Mortising-Machine; and I do hereby declare that the 
following is a full and exact description.

The nature of my invention consists of a frame work, slides, 
jaws, chisel, treadle, and other fixtures, all of which I will 
more particularly describe, so as to enable others skilled in the 
art to build and use my invention. The frame may be made of any 
convenient height and width according to the wish of the maker 
and here I will describe a frame together with the appendages 
which I judge to be of the best proportions.

I make two posts marked B B on the drawings four feet high and 
three inches square and the insides are six inches apart. The top 
ends of the posts are secured by a cap A, which cap is one foot 
and three inches long, three inches wide and two inches thick.

The posts B B are set up in a vertical position and connected by 
a girth six inches long, which girth is inserted between the 
posts B B about one foot and six inches below the cap A. Feet are 
made to the posts of timber one inch thick and one foot and six 
inches long. The top side of the feet E E are cut in a convex or 
semicircular shape and are secured to the posts B B by wood 
screws or bolts. These feet serve to keep the frame in a vertical 
position and they also support a roller which is placed near the 
back ends of the feet. The roller supports the back end of the 
treadle I. This treadle is one foot and six inches long and three 
inches wide. I make a mortise in the treadle to receive the lower 
end of the connecting rod H and secure the same by an iron pin. A 
timber C four feet long and three and one half inches wide and 
three inches deep at the center and made tapering at each end is 
bolted onto the front sides of the posts B B, and the posts have 
mortises about ten inches long through which the bolts pass which 
fasten the part C at any desired height according to the 
thickness of the article to be mortised.

A piece of wood F eight inches long one and one half inches wide 
and three-fourths of an inch thick is secured to the plate A by 
screws. This piece serves to keep the article to be mortised from 
raising up.

Two iron guides, Fig. 1, are inserted one on each of the inside 
of the two upright posts near the top ends of the same. These 
guides are about six inches long and one fourth of an inch thick 
and serve to support the top end of the casting G.

A casting marked G two feet long one and one half inches wide and 
one inch thick with a flange or brace on the back side and cross 
arms near the top end is fixed between the posts B B and 
supported at the ends of the cross arms by the guides before 
mentioned. On the top end of this casting is another casting 
marked K, Fig. 2, which is six inches long and one and one half 
inches square with a jaw to support the chisel. A slot is made 
through the casting and two ,.. bolts pass through the same end, 
fasten it to the casting G, and by means of this slot and the 
bolts Q Q. The parts K in which the chisel is secured may be set 
at any distance desired from the front part of the casting G. The 
lower end of the casting G is steadied by passing through an 
indenture made in the cross girth 2, Fig. 1, that connects the 
posts. Two iron screws 3, Fig. 1, are inserted in this last named 
cross piece to support the springs D D.

Two springs D D of wood or steel about three feet long and 
fastened together at the ends and the upper one resting on the 
iron screws before mentioned and the lower one put beneath a pin 
4 in the casting G serve to keep the said casting and the chisel 
raised up.

An iron connecting rod is secured to the lower end of the casting 
G by a joint and pin, and at the lower end of the connecting rod 
H is the treadle I with a mortise and pin which serves to unite 
the connecting rod to the treadle. A nut with a crank N, Fig. 2, 
serves to screw up the jaw O and causes it to bear on the side of 
the chisel.

A jaw of cast iron marked O, Fig. 2, three inches long and one 
and one half inches wide and about one half inch thick is secured 
to the casting K by a bolt or screw with a crank N.

The chisel P is about five inches long and should be made of the 
width of the mortise intended to be made. The top end of the 
chisel where it is fixed between the jaws is indented on each 
side with indentures E, Fig. 2, about one eighth of an inch deep 
and about three eighths of an inch long, in "which indenture the 
back jaw is made to fit so that the chisel may be set to face 
either way. On the casting K next to the chisel is an arm about 
two and one fourth inches long and one and one half inches wide 
which serves as a back jaw to the vise in which the chisel is 
fixed. In the front side of the casting K is an indenture s, Fig. 
2, three eighths of an inch wide and about one eighth of an inch 
deep. In this indenture one side of the chisel is placed and made 
to fit and this serves to keep the chisel in a vertical position. 
Near the top of the indenture on the back jaws before mentioned 
is a protuberance T which fits in the notch in to the side of the 
chisel and keeps the chisel from sliding up or down in the 

The mode of operating is thus: Take the article that is to be 
mortised and place the same on the top side of the cross piece C, 
raise up the cross piece C until the top side of the article to 
be mortised touches the end of the timber F and then screw the 
cross piece C to the posts B B and as the chisel acts on the 
article move it to the right or left until the mortise is 
finished at one end then face the chisel the other way and move 
the article until the other end of the mortise is finished. At 
the same time act on the treadle I with the foot to give the 
chisel motion. Motion may be also given to the chisel with water, 
steam or animal power. Mortises may be made at any desired 
distance from the face of the article by setting the casting K to 
which the chisel is attached backward or forward by means of the 
slot and securing the same firmly by the screws Q Q.

What I claim as my invention and desire to secure by Letters 
Patent is—

The method of securing the chisel by which means it can be 
readily reversed and the method of moving the chisel backward and 
forward all as above described.

Ira Mclaughlin.

Witnesses: G. B. Bacon, C.