Improved Machine for Screwing the Shanks of Hook Screws, Screw Eyes, and the like.
Year: 1898

page_text: Date of Application, 1st Feb., 1898-Accepted, 27th Aug., 1898
COMPLETE SPECIFICATION.
Improved Machine for Screwing the Shanks of Hook Screws, Screw
Eyes, and the like.
1. RICHARD DAHLMANN, of 3, Bruderstrasse, Gevelsberg. Westphalia, Germany,
Manufacturer, 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 such automatic wood screw cutting machines, which are
capable of providing nails with ring or hookshaped head with screw thread and it
consists in the construction and arrangement of a tong by which the nail is always
suitably seized, the tong revolving thereby continuously. My invention further
consists in the arrangement and use of an improved feeding device for the screw
blanks to the tong and in the manner of moving the thread cutting tool.
The manner,
in which my invention is thrown into effect is shown on the accom-
panying drawings on which
Figure 1 is a plan of the improved machine.
Figure 2 shows the feeding device.
Figure 3 shows a detail of construction.
Figures 4-9 are plans and sections respectively of the tong.
Like letters of reference indicate to corresponding parts in the drawing. The
machine, which is generally old and well known is only so far illustrated and
described as it is necessary for a better understanding of the action of the improved
parts.
1 denotes the frame of the machine, in which the tong 2 is journalled
in suitable bearings, the construction of which I shall describe herein-
after. 3 is a pulley to rotate the tong. 4 is a pinion which imparts motion
to the several shafts by corresponding gear not shown in the drawing. 5 is a
plate, which contains the nails, and which revolves by suitable gear. Above this
plate is arranged a forked piece 13 which is pivotally secured to a standard 6, 7
and beyond the plate 5 extends to a sliding channel 131. The forked piece 13
serves as support for a disk 8, which is rotated by cord gear 9, 10, 11 that is set
in motion by the machine. The disk 8 is provided at one side with hooks 12, which
during the rotation of the disk catch the blanks at their eyes (Fig. 2) taking
them round and putting them down into the channel 131. The channel 131 is
periodically moved downwards by suitable means so that the blanks are carried
down to the tong with the eye towards its face, where they are seized by a nipper.
As this element is generally used in such machines I have not given any descrip-
tion thereof. The tong being the most important element of the machine has the
great advantage that it also revolves during the introduction of the blank which
operation always requires a stopping of the tong by the known machines.
The tong is fully illustrated in Figures 4-9 on Sheet 2 of the drawing.
Upon the body or spindle of the tong 15 is stuck a box 16, which may be
shifted lengthways and turns round with the body. To the latter are fixed
bearings 17 having mortises for the bolts 18 round which are arranged the movable
jaw holders 19. These holders are provided with a recess into which fit an angle
shaped jaw 22, which are turnable round bolts 21. In the face of the jaws is cut
the shape of the eye of the nail as will be best understood from Figure 8.
Now the jaws have a peculiar movement. When the tong is opened, for which
purpose the box 16 the back portion of which is formed to a clamping disk, is

page_text: shifted backwards by means of a lever and an excentric disk, the holders 19 are
caused to be turned round their spindles 18 by means of springs 24. At the same
time the jaws which follow the movement of their holders are turned independently
from this movement in another direction, which is done by means of springs 25
and this movement is thus executed that the faces of the jaws lie in opposite
direction as will be seen from Figures 6 and 7. The jaws are now sufficiently
opened to conveniently take up a wire blank, the eye of which may be in any
position. In Figure 8 is illustrated the most unfavourable position. Now when
the tong is closed which is done by means of a coil spring 26 pressing against the
clamping disk 161 and shifting the box 16 again in its former position. The box 16
is fitted with wedge shaped pieces 27, which may be regulated by set screws and
which engage the jaw holders forcing them to go back in their closed position.
The jaws of course are following but they are turned again round their pivots 21
for in going downwards they touch the pointed edge of pieces 28 and thus they
are caused to turn and return in their closed position.
Now this movement of the jaws serves to regulate the position of the wire blank,
for the eye of the same being touched by the jaws at both opposite sides is cause
to turn and take its proper position so that the jaws may be wholly closed and
steadily keep the nail and this operation takes place so quick and secure that no
disturbance in the working of the machine can happen.
If the blank is finished and freed from the jaws it is pushed out of the tong by
means of a correspondingly shaped rod 32, which is fixed to a clamping disk 31.
A coil spring 30 drives this disk forwards for a named purpose and a lever 33
gives it the backwards movement.
The tool holder, which cuts the point of the nail may be combined with the
counter bracket 35, which for this purpose is provided with a pivot 36 Serving as
fulcrum for the tool holder 34. This holder is pressed against the nail by a
lever 38 and curved disk and removed from it by a spring 381 the counter-
bracket being together with this operation pressed against the nail and removed
turning round its pivot 35¹.
The shifting of the shaft which carries the thread tool holder is done by an
excentric disk 41. This disk engages a slide 40 being guided in a corresponding
case at right angle to the shaft 39. The shaft running through the slide and its
case is fitted with a head 42 having a fulcrum 44, which serves as support for an
angle piece 43 being guided by the casing 45. The one shank c of this piece may
be regulated by a set screw 46 in order to give the shaft 39 a more or less long
travel according to the length and thread of the screw.
my
Having now particularly described and ascertained the nature of said
invention and in what manner the same is to be performed. I declare that what
I claim is:
1) In a machine for cutting wood screws with eye shaped or hook shaped head
the arrangement and use of a tong, the jaws of which being thus constructed,
that the position of the eye of the blank always is regulated and the eye or hook
properly seized by the jaws as described and for the purpose set forth
2) In a machine for cutting wood screws with eye shaped or hook shaped head
the mechanism for feeding the wire blanks consisting of a continuously rotating
disk with hooks that catch the nails and place them into a channel being combined
with said disk and having an oscillating movement.
The whole as illustrated and for the purpose set forth.
0041.
Tanna1000