Improvements in Lasts for Boots and Shoes.
Year: 1892

page_text: Date of Application, 15th Feb., 1892-Accepted, 2nd Apr., 1892
COMPLETE SPECIFICATION.
Improvements in Lasts for Boots and Shoes.
We, EDWIN ORLANDO KRENTLER and GEORGE AUGUSTUS KRENTLER of
245 Rivard Street in the City of Detroit in the County of Wayne and State of
Michigan United States of America, Manufacturers, 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 new and useful improvements in lasts for boots and
shoes, and our invention is designed to construct a last of sufficient strength and
durability to be adapted for use with the well known heeling machines in the
operation of securing the heel to the shoe, while at the same time it is cheap and
light enough to be used in lieu of the common wooden last, and thus permit the
heeling and finishing of the shoe on the same last.
This invention consists in the peculiar construction of a metallic beel and
bushing, all as more fully hereinafter described and shown in the accompanying
drawings, in which,
Fig. 1 is a vertical, central section through a last provided with our improved
metallic heel and bushing.
Fig. 2 is a detached perspective view of the bushing.
Fig. 3 is a plan view of the device for securing the bushing in the last.
A is a wooden last of the ordinary construction.
B is a metallic heel provided with a solid stem C which extends into the body of
the last.
D is a hollow metal bushing secured in an aperture formed in the comb of the
last in line with the stem C. This bushing forms a triangular, square or other
polygonal or irregular socket, and is provided with a few spurs E to hold it in the
wood of the last.
The bushing and stem of the metallic heel are preferably made of the same.
diameter, so that by boring a hole through the last they may be both secured in
the same hole.
In driving the bushing into place great care must be taken to adjust it properly,
so that when any last is placed upon the pin of the heeling machine it will always
be held in its proper position.
To adjust the bushing we preferably use the device shown in Fig. 3, which
consists of a bed plate a provided with a longitudinal slide b, and with two
transverse slides c adjustably secured upon this longitudinal slide and each carrying
a pin d, the two slides being provided with proper adjusting screws for adjustably
securing them. At one end of the bed plate is a fixed pine which fits the socket.
of the bushing.
In using the machine the bushing is placed on the pin e and the last is then
driven onto the bushing after the front end of the last is engaged between the two
pins dd, which are properly adjusted to hold the center line of the last in the
center line of the device.
If this adjustment of the pins d d is always properly made for all the different
sizes and forms of lasts it follows necessarily that the bushings in all the lasts are
secured in the sanie manner.
The necessity of so much care in driving the bushing into the last will be obvious
to those acquainted with the working of the heeling machine, as if the last is not
held properly the heel would be misplaced.
The spurs on the bushing have the office of preventing the bushing from turning
in the wood.
Our construction of last has another important advantage which we will now explain;
FD 017

page_text: In turning lasts of different sizes with any of the turning lathes in use it is obvious
that all the dimensions of the last are correspondingly enlarged or diminished and
therefore in every last the distance between the heel and the comb of the last
necessarily differs in different sizes, and it has always been necessary in other
constructions of lasts to reduce this distance to a uniform height. This is entirely
obviated in our construction as the pressure of the heeling machine is brought upon
the metallic heel and through the stem of the metallic heel it is directly received
by the pin F of the heeling machine, the latter being simply made long enough so
as not to bear against the comb of the last.
Thus no pressure is brought upon the last at all and if the metallic heel and
stem C are strong enough, the last will stand any amount of wear and tear without
being in any way injuriously affected.
The metallic heel may be held in position by the frictional engagement of the
stem C in the hole of the last, or if desired it may be fastened additionally by a
few screws.
The spirit of our invention consists in making a last with a strong and substantial
metallic heel in combination with the pin of a heeling machine yoke adapted to
directly bear against such heel plate with a bushing adapted to hold the last in its
proper alignment.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :
1. The combination of a wooden last, a metallic heel secured to said last, a
bushing secured in the comb of the last and adapted to form a guide socket, and a
heeling machine pin or yoke adapted to fit into the bushing of the last and to abut
against the metallic heel to directly receive the pressure from the heeling machine,
substantially as described.
2. The combination, with a last having a vertical aperture extending entirely
through the heel thereof, of a metallic heel-plate secured to said heel and provided
with an integral extension into the aperture having an unbroken face affording a
bearing for the pin, of a heeling-machine having a corresponding end and a metallic
bushing in the opposite end of the aperture and extending toward but not to the
stem of the heel-plate, and having an irregularity in the bore and on its exterior
for co-operating with corresponding constructions in the last and pin of the heeling
machine, substantially as described.
Dated this 20th dox of January 1900
EDWIN ORLANDO KRENTLER.
GEORGE AUGUSTUS KRENTLER.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, Agents for the Applicants.