Improvements in Apparatus for Driving Tacks.
Year: 1893

page_text: Date of Application, 14th Oct., 1893
Complete Specification Left, 13th July, 1894-Accepted, 8th Sept., 1894
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Driving Tacks.
I WILLIAM HENRY DORMAN, of The Hawthorns, Newport Road, Stafford,
in the County of Stafford, Engineer, do hereby declare the nature of this invention
to be as follows:-
My invention relates to machinery or apparatus used for driving tacks, as in
lasting boots and shoes or similar operations.
The tacks or nails are supplied to the apparatus in strips of cardboard or
other suitable material, hereinafter called "tack-strips," in which the tacks are
inserted up to the head at small and equal distances apart and are retained by
strips of paper pasted over the heads of the tacks.
These "tack-strips" are inserted in the tack driving apparatus and fed forward
automatically, a tack at a time, beneath a driver which is pushed or struck down
upon each tack in succession so as to drive the tacks into the boot-upper or
other material upon which the apparatus is being used.
The apparatus consists of a body or case to contain the parts, a cover for the
same, a driver to drive the tacks and a driver bar to carry the driver, a spring
to return the driver, a feed lever, cam roll and connections, a feed slide and
spring, a feed claw, a retaining claw and springs, and a nozzle with its block
and bolt.
The feeding and retaining claws are provided with thumb pieces so that they
can easily be opened for insertion or removal of the "tack-strips" and they are
provided with double claws and notches to ensure the correct and proper feeding
of the "strips."
Dated this 13th day of October 1802
COMPLETE SPECIFICATION.
Improvements in Apparatus for Driving Tacks.
I WILLIAM HENRY DORMAN, of The Hawthorns, Newport Road, Stafford,
in the County of Stafford, Engineer 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 :―
My invention relates to machinery or apparatus used for driving tacks, as in
lasting boots and shoes or similar operations, and consists in improving the
construction of the mechanism by which the feeding operation is performed.
An apparatus for the purpose of driving tacks has hitherto been constructed in
which the tacks or nails are supplied to the apparatus in strips of card-board or
other suitable material hereinafter called "tack-strips" in which the tacks are
inserted up to the head at small and equal distances apart and are retained by
strips of paper pasted over the heads of the tacks.
These tack-strips" are inserted in the tack driving apparatus and fed forward
automatically, a tack at a time, beneath a driver which is pushed or struck down
upon each tack in succession so as to drive the tacks into the boot upper or other
material upon which the apparatus is being used.
The accompanying drawings serve to illustrate my invention in which
Fig. 1 is a side view of a tack driving apparatus.
Fio is on annosite side view

page_text: Figs. 5 and 6 are enlarged sectional views.
Fig. 7. is an enlarged sectional plan.
Figs. 8 and 9. shew the feed claw and
Figs. 10 and 11 the retaining claw removed.
Fig. 12. shews the nozzle and claw points.
The apparatus is constructed as follows:-
The body or case a contains the parts and is provided with a cover b. The
driver c which drives the tacks into the work is carried in the driver bar d which
is pushed or struck down by its knob e and the spring f returns the driver c to its
raised position.
Upon the driver bar d is a study which engages a cam sloth formed in the feed
lever i which is mounted on a pivot j and provided at its lower end with a slot k.
The slot k engages a die which is mounted on a pin m in the feed slide n and the
up and down movements of the driver bar d operate the feed lever i and feed
slide n.
The feed slide n carries the feed claw o which is mounted on its pivot stem p in
the bearing and has a spring to keep it in engagement with the "tack-strip" s.
Opposite to the feed claw o is the retaining claw t mounted on its pivot u and
held in engagement with the "tack-strip s by the spring v.
The extremity of the claw t* forms the side of the nozzle w.
the tack and closes up behind it.
It opens to admit
The nozzle w is carried by the block which is held to the case a by the bolt y.
The nozzle rests upon the work when a tack is being driven and is provided with
a hole z down through which the driver e passes, punching the tack out through
the paper strip and driving it into the work.
2
Hitherto the feed claw o has been made with one claw o' only and in consequence
of this the tacks have been liable to get out of the vertical position when the
feeding pressure of the claw o has been brought to bear upon them by the
operation of the feed slide n and as a result clogging of the apparatus has taken
place. The point of the tack has sometimes failed to pass the retaining claw t
and consequently has not got into the hole so that when the driver has been
forced down upon the tack head the tack has become doubled up in the apparatus
instead of being driven straight out into the work.
To remedy this I improve the construction of the feed claw o by adding another
claw o which takes hold of the tack nearer to its point and in conjunction with the
claw o compels the tack while being fed forward to maintain its vertical position
past the retaining claw t and into the hole z.
The retaining claw was formerly made to take under the bead of the nail only
without a corresponding portion t¹ to guide the point and was also carried upon a
horizontal pivot from above so that in opening its movement was in a vertical
plane and it was liable in consequence to allow the tacks to escape from the
nozzle.
so that it shall more
carry the claw upon a
plane and so constantly
I now make this retaining claw with the portion
effectively retain the tack in the vertical position and I
vertical pivot u so that in opening it moves in a horizontal
preserves its acting face parallel to the side of the nozzle.
I also prolong the extremities of the claws so as to form thumb pieces o³ and t
for the purpose of more easily opening the claws o and t when it is desired to insert
or remove a tack-strip."
66
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :
In a tack driving apparatus using "tack-strips" as herein described:
1
The use of alhink in fa
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1 11
1

page_text: place near the point as well as near the head so as to ensure the tack being fed
forward in a vertical position substantially as described.
2. The herein described and illustrated feed claw having in addition to the usual
claw o' a claw o² as and for the purpose specified.
3. The improved retaining claw provided with the portion t¹ and mounted in the
manner herein described and illustrated and for the purpose specified.
4. The addition of the thumb pieces o³ and t2 for more readily opening the
claws.
W. H. DORMAN.