Improvements in Adjustable Mitre-boxes.
Year: 1893

page_text: Date of Application, 25th Apr., 1893-Accepted, 2nd Sept., 1893
COMPLETE SPECIFICATION.
Improvements in Adjustable Mitre-boxes.
I, JOHN LUSCHER, Mechanic, residing at 823 Warren Street St. Louis, State
of Missouri, United States of America, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :—
My invention relates to improvements in adjustable mitre-boxes and consists in
the novel arrangement and combination of parts, as will be more fully hereinafter
described and set forth in the claims.
The object of my improvement is to construct a device of this class which
embodies parts, adjustable to any desired angle at which it might be desired to cut
the mitre.
The improvement is also constructed in such a manner that its durability is
unquestionable, and one of its main features lies in providing the guides with
common centers, thus enabling the measurement to be taken from said centers in
order to obtain any desired angle.
In the drawings:
Fig. 1 is a perspective view of my complete invention, showing a saw in position
as indicated by dotted lines.
Fig. 2 is a top plan view of my complete invention showing different angles at
which the guides may be placed, both by dotted and solid lines.
Fig. 3 is an end view of the mitre-box.
Fig. 4 is an enlarged detail elevation of a portion of one of the adjustable base-
frames.
Fig. 5 is a similar elevation of the complete base-frame.
Fig. 6 is a top plan view of the modified form of the mitre-box.
Fig. 7 is an end view of the same.
Fig. 8 is a vertical sectional view taken through the line A-A in Fig. 6.
Fig. 9 is an enlarged elevation of the base-frame of the guide as used in the
modification.
Fig. 10 is an inverted plan view of the base-frame.
Fig. 11 is a rear end elevation of the base-frame and guide removed from
connection with other parts.
Referring to the drawings
indicates the base-board which it may be said forms the foundation for the
construction herein described and claimed.
Secured upon the upper side of the base-board 1 are a number of blocks 2 which
serve to elevate a plate 3 above said base-board 1, the relative position and size of
the blocks 2 being shown by dotted lives in Fig. 2.
The plate 3 is not of the same width as the base-board 1, but along its straight
inner edge is provided with upwardly projecting preferably metallic plates 4,
located at right angles with the surface of said plate 3, and held in an aligned
upright position by braces 5 secured upon the base-board 1.
"The plates 4 are not continuous but leave open spaces between their ends, which
allow the operation of certain parts hereinafter described.
Pivoted under the plate 3 adjacent its inner edge and immediately under the
space between the ends of the plates 4 are frames 6 upon which are mounted the
guide-blocks 7.
Said frames 6 consist of metallic plates provided upon each end with diverging
slotted arms 8. which give said ends somewhat the appearance of a Y.

page_text: The arms 8 are provided with slots 9 through which screws 10 are placed and
which pass upwardly and engage the blocks 7..
Projecting upwardly from the outer edges of the arms 8 are plates 11 which are
provided upon their upper edges with extensions 12, which are only about one half
the thickness of said plates 11, and are adapted to be engaged by a small plate 13
which is screwed into the blocks 7.
The inner edges of the arms 8 are surmounted by upwardly projecting strips 14
which engage in cut out portion in the under side of the blocks. 7, and assist in
keeping the same in a rigid position.
The blocks 7 consist of two straight center guide strips 15 upon the outer sides
of which are secured triangular shaped blocks 16 which are engaged by the
plates 11 and 13.
Both ends of the base frame 6 are similarly constructed, and the pivotal point of
the complete guide is near one end, the relative location of the guides and the
remainder of the construction being particularly shown in Fig. 2.
Secured to the outer edges of the base frame 6 are projecting curvilinear slotted
arms 17, said arms being adapted to operate in connection with a set-screw 18 by
the use of which said guides can be set in any desired position.
This function is especially illustrated in Fig. 2 where the scope of possible
movements is clearly shown.
The plate 3 has its outer edge curved and cut away to allow the free movement
of the guide, as around a quadrant.
Upon the rounded edges of said plate 3 are placed indicating saw-cuts or other
marks to denote the different angles at which the guides may be placed.
Secured upon the frame 6 and near the outer guide is an indicating pointer 19
which points towards the indicating marks 20 arranged along the curved edge of
the plate 3.
A slight passage is left between the strips 15 of the blocks 7 in order to allow
the insertion of the saw. The plates 4 provide a back, against which the timber
to be cut is placed and held firmly by the hand or a clamp during the operation of
cutting the joint.
Reference to Fig. 3 gives a clear and concise idea of the relative arrangement
of the parts, Fig. 2 also enabling the observer to note the many positions and
angles which the guides may attain.
I have now fully described the construction of the mitre-box, as designed for the
cutting of large timbers, and I will now proceed with the description of what I
have shown as a modification the same being especially designed for use in small
molding and quarter strips, and in this construction 1 apply the same principle, but
with a simpler manner of adjusting the guides for use.
The base boards 21 upon which are secured the blocks 22 elevate a plate 23 as
in a construction hereinbefore described, and the inner edge of the plates 23 is
surmounted by a metallic plate 24 against which the timbers are placed when it is
desired to cut the joint.
The base frame 25 is of a construction nearly similar to the construction before
referred to, the same having similar arms 26 and guide blocks 27.
As this construction has been before detailed, I will not enter into a specific
description of the same.
The frame 25 is provided with a projecting curvilinear slotted arm 28, the
operation of which is similar to the arm 18 upon the base frame 6.
I desire to call particular attention to the fact that the guides in the original
construction shown in the first sheet of the drawings, have what might be termed
a common center, that is, the passage for the guidance of the saw, points to the
indicating mark on the inner edge of the plate 3 at whatever angle said guide
may be placed.
This is also true of the construction shown on the second sheets of the drawings,
the single guide having the same function.
The construction of my invention is such that the securance of the blocks 7

page_text: and 27 prevent the warping of same to change the location of the passage or guide
for the saw, and the general construction is intended to eliminate any possibility of
the parts becoming deranged, thus preventing a perfect operation of the parts.
The device could be constructed with any number of guides, without in any way
materially altering the idea of my invention.
Having now particularly described and ascertained the nature of my said inven-
tion and in which manner the same is to be performed, I declare that what I
claim is:
1. An improved adjustable mitre-box having saw guides adjustable at any angle,
substantially as set forth.
2. An improved adjustable mitre-box having saw guides adjustable at any angle,
and adapted to be set for use, substantially as set forth.
3. An improved adjustable mitre-box having one or more adjustably pivoted
saw-guides, and means provided for locking said guides at any desired angle,
substantially as set forth.
4. An improved adjustable mitre-box having a plurality of adjustably pivoted
guide-frames, saw-blocks secured upon the end thereof, and means for securing said
guide-frame to enable the cutting of the joint, substantially as set forth.
5. An improved adjustable mitre box having adjustable guide frame provided
with distending arms upon one or both ends thereof, said arms provided with means
to secure the guide-blocks to allow the passage of the saw at the desired angle, and
said frame pivoted, and adjustable at any desired angle for the cutting of the mitre,
substantially as set forth.
6. An improved adjustable mitre-box provided with one or more guide-frames
provided with means for securing the blocks to guide the passage of the saw, said
frames provided with projecting slotted curvilinear arms, a set screw engaging said
arms and adapted to hold the same in any desired position, substantially as set
forth.
7. An improved adjustable mitre-box having one or more guide-frames pivoted
between a base-board and elevated plate, vertical plates secured to the inner edge
of said plate, said vertical plate adapted to determine the location of the strips to
be cut, and said guide-frames adjustable to any angle to admit of the cutting of the
joint as desired, substantially as set forth.
Dated this 22nd day of April 1893.
MARKS & CLERK,
13, Temple Street, Birmingham, Agents.