Improved Key for Secureing Mitred Angles in Wood-work.
Year: 1896

page_text: Date of Application, 12th Dec., 1896
Complete Specification Left, 11th Sept., 1897--Accepted, 11th Dec., 1896
PROVISIONAL SPECIFICATION.
Improved Key for Secureing Mitred Angles in Wood-work.
WILLIAM ELI PLESTED (Joiner) 11 Shakespeare St. Leavesden Rd. Watford
Herts. do hereby declare the nature of this invention to be as follows:-
Hitherto the methods of secureing mitred angles in woodwork, have been most
unsatisfactory in their results. My invention has for its object to provide a ready
and efficient means for secureing mitres in woodwork, such as picture frames &
Architrive mouldings in fact it could be modified so as to be employed in all cases
where a mitred angle, is used.
It consists essentially of a thin piece of sheet Iron cast or otherwise made taper-
ing and the edges enlarged. A saw curf is made in the edges to be mitred into
which, the above, is inserted.
This mitre grip being tapering draws the two edges together while being
inserted and the enlarged edges offer a determined resistance to their being
afterwards, separated.
Dotod this 10th day of Doo 1896
W. E. PLESTED.
COMPLETE SPECIFICATION.
Improved Key for Securing Mitred Angles in Wood-work.
WILLIAM ELI PLESTED of 11 Shakespeare Street Leavesden Road Watford in
the County of Hertford, Joiner do hereby declare the nature of this invention and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
This invention relates to an improved key for mitre and other joints, wherei,y
a ready and efficient means is provided for drawing together and holding the
pieces of material to be connected. It also has for its object the holding of the
pieces of material joined in the desired plane or position.
It consists essentially of a flat piece of metal or other suitable material one end
of which may be pointed to admit of the ready insertion into the pieces of material
to be joined, the other end is formed for driving.
Upon the surface of the key are two or more projecting ribs which approach
one another as they near the driving end.
These ribs engage or enter the surface or the surfaces of slits grooves or saw
curfs made in the pieces to be connected and the taper of the ribs upon the key
being driven, draws together the pieces to be joined and also holds them securely
in the desired position.
The key may be cast, grooved, rolled, stamped cut, formed of wire, or cut from

page_text: rolled bars of the required section and the ends expanded or contracted to obtain
the necessary tapering of the ribs.
The key may be made of a variety of designs for the particular purpose for
which it is required, and may be adapted to any material or materials suitable to
be fastened by this kind of key.
The ribs may be on one or boths sides of the key and may also be of any number.
The ribs may also rise to different heights above the shank or general surface
of the key and may rise gradually from the surface of the key where they enter
the materials to be joined.
The key may also have a central rily or ribs for the purpose of the better driving
of the key along a groove or grooves previously cut in the materials to be joined
more readily.
The ribs may be serrated or indented like a saw for the better purpose of enter-
ing the materials to be joined.
These ribs of whatsoever transverse section may also be curved in the direction
of their length gradually approaching the driving end.
The key may be also indented or corrugated so that'the raised portions on each
side may approach together towards the driving end and thus draw together the
materials to be joined as previously described.
Slits or saw curfs may be cut in the materials to be connected for the more ready
insertion of the key.
Holes may be formed in the key for the purpose of additional fixing by means
of pins screws nails &c. or more than one key may be used to each joint.
The driving end of the key may be formed to suit a tool employed for driving.
The end of the key may be turned up to suit the external shape of the materials
joined and may also have holes formed in the piece or pieces so turned up for the
purpose of additional fixing by means of pins screws nails and the like.
The key may be employed to connect pieces of material of different substances.
The key may be made so that the portions entering different pieces of the
material to be joined shall he inclined to one another.
The key muy also have additional branches with ribs in proportion to the
number of pieces of material to be joined. These ribs may be of any description
hereinbefore described.
Referring to the accompanying drawings Fig. 1. is a front elevation of the key.
Fig. 2. is a side elevation of the key.
Fig 3 is a transverse section through the key.
Fig 4 shows the application of the key to a mitre joint where the key is inserted
from the internal angle of the joint.
Fig 5. is a front elevation of a key adapted to a mitre joint.
Fig 6 is a side elevation of the same.
Fig 7. is a transverse section of the same.
Fig 8 shows the application of the key to a mitre joint where the key is inserted
from the external angle of the joint.
Fig. 9. is a front elevation of the key with holes, and ends turned up for
additional fixing by means of screws nails pins or the like.
Fig 10. a side elevation of the same.
Fig 11. a transverse section of the same.
Fig 12. shows the application of the same to a mitre joint.
Fig 13 is a front elevation of a key with serrated ribs and also with a central
rib as guide.
Fig 14. is a side elevation of the same.
Fig 15. is a transverse section of the same.
Fig 16. shews the application of the same to a buto joint.
Fig 17 is a front elevation of a key with two additional serrated ribs.
Fig 18 is a side elevation of the same.
Fig 19 is a transverse section of the same.
Fig 20. shews the application of the same to a square joint.

page_text: Fig 21. is a front elevation of a key with corrugations forming ribs approaching
one another towards the driving end.
Fig 22 is a side elevation of the same.
Fig 23 is a transverse section of the same.
Fig 24 is a front elevation and shows a form of key where it is desired that
the pieces to be connected shall be inclined to one another.
Fig 25 is a side elevation of the same.
Fig 26 is a transverse section through same
Fig 27. is a front elevation of an ornamental form of key which may be used
externally and cover the joint with ribs as before described.
Fig 28 is a transverse section through same.
Fig 29 is a front elevation of a key with curved continuous ribs..
Fig 30. is a transverse section of same.
Fig 31. shews the front elevation of the key with two serrated ribs.
Fig 32. is a side elevation of the same.
Fig 33. is a transverse section of the same.
Fig 34 shews the application of the same.
Fig 35 shews the front elevation of the key with three branches with con-
tinuous ribs.
Fig 36 is a transverse section of same.
Fig 37 shews the application of the same to three pieces of material.
a indicates the point by which the key enters.
b indicates the continuous projecting ribs.
c indicates additional projecting ribs.
d indicates the ends of the key turned up.
e indicates the holes for screws nails pins or the like.
f indicates the rib serrated.
g indicates the additional rib for the purpose of acting as a guide.
indicates additional serrated ribs.
i indicates ribs curved in the direction of their length.
j indicates additional flanges of key adapted for drawing and connecting three
pieces of material.
k indicates driving end in each case.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed. I declare that what I
claim is
First An improved key for securing mitre or other joints having ribs approach-
ing one another towards the driving end engaging the materials to be joined and
drawing them together when the key is driven in the manner hereinbefore
explained and described.
Second. The mitre or other key having its ribs continuous or with serrated edge
and increasing in height from the point where they enter the materials to be joined.
Third. The mitre or other key having flanges or branches with ribs in pro-
portion to the number of pieces of material to be joined whereby the pieces of
material to be connected are drawn together and held securely substantially and
as described and shewn in the accompanying specification and drawings.
Dated this 10th day of Sentemhar 1897
WILLIAM ELI PLESTED.