Improvements in and relating to Machines for Rolling Screw-threads..
Year: 1893

page_text: Date of Application, 7th July, 1893-Accepted, 12th Aug., 1893
COMPLETE SPECIFICATION.
[Communicated from abroad by LA SOCIÉTÉ ANONYME "LA VISSERIE Belge,"
of Laeken, in the Kingdom of Belgium.]
Improvements in and relating to Machines for Rolling Screw-threads..
I, HENRY HARRIS LAKE, of the Firm of Haseltine Lake & Co., Patent Agents,
45 Southampton Buildings, in the County of Middlesex, 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 a machine for rolling screw-threads, and has for its
object to impart to two straight screw dies, producing the screw threads by rolling,.
an alternating rectilineal movement at a speed which is at every moment of the
motion exactly the same for each of the dies; to place the blanks between the dies,
by an automatic distributor; and to automatically conduct the blanks thrown
pell-mell into a reservoir to the distributor.
These results are obtained by the aid of the mechanism hereinafter described and
represented in the accompanying drawings.
Figure 1 shows a plan of the improved machine.
Figure 2 is a side elevation of the same, partly in section.
Figure 3 is an end elevation of the machine. The position of the connecting
rods which actuate the dies being changed relatively to that which they occupy in
Figures 1 and 2 to show the movement better.
Figure 4 is a vertical section on the line X-x of Figure 1.
Figures 5, 6, 7 and 8 show details of the automatic distributor placing the blanks
between the dies.
2
Figures 9 and 9 show in diagram the operation of the connecting rods imparting;
motion to the dies.
In all the figures similar letters of reference designate corresponding parts.
The frame of the machine is mounted on two feet A and B. This frame
formed of two vertical side-pieces C and D cast in one piece with the part E
which unites them.
The shaft F by which motion is imparted to the machine is supported in two
bearings C C and is actuated by the pulley P¹, the pulley PH being loose.
V is the fly wheel of the machine. By means of a pinion G the shaft F sets
in motion a toothed wheel H which turns the shaft I moving in the bearing K
and actuating the disc N to which is fixed a connecting rod M adapted to impart
a reciprocating movement to the die holder Q by means of the slide S and the
rod P. To the toothed wheel H is also fixed a connecting rod L which imparts
reciprocating motion to the die holder R. The two crank pins provided upon
the toothed wheel H and upon the disc N are fixed at an angle of 180 degrees
to each other. In order that the speeds of the two dies may at any moment of
the motion be exactly equal one of the dies is acted upon directly by the
connecting rod (Figure 9) and for the other die (Figure 9A) a bar is interposed
between the connecting rod and the die, the said bar being guided in a straight
line to the point A.
When in these arrangements one of the die holders moves from right to left
the other moves from left to right, and at each moment of the motion the
speeds of the die holders, and consequently of the dies, are always absolutely the
same.
The following is a description of the mechanism which automatically distributes
the blanks of screws between the dies. This mechanism, not shown in Figures I'
and 2 so as not to uselessly complicate them, is represented in detail in Figures 5, 6
and 7 to an enlarged scale.
For enabling the blanks to pass automatically to the guide a they are thrown

page_text: pell-mell into the reservoir V fixed to the frame of the machine. A kind of
scoop V¹ moves in the middle of this reservoir in a vertical plane, oscillating upon the
pivot X. When the upper part of the scoop moves to the bottom of the reservoir V
the blanks, by reason of their own weight, will engage with the longitudinal central
groove in this scoop, which groove is of the same length as the bottom of the
reservoir, and on raising the upper part of the scoop which forms an inclined plane.
without a break of continuity towards the guide a, the blanks slide and pass to this
guide.
Motion is communicated to the scoop V₁ by a connecting rod Y attached to a
lever Z oscillating upon the point Z'. The other extremity of the lever Z is in
contact with a cam Y¹ set in motion by the shaft F by means of spur wheels (see
Figure 2).
The guide a conducts the blank into a distributing box b. Owing to the
inclination of the guide the blank will be placed in the cavity of the bar e, then
this har advances from right to left and presents the blank in front of the hole f.
At this moment acts the pusher g set in motion by the spring to which it is fixed, and
forcing the blank into the hole f. This blank then falls between the dies T and T¹
and is held in the desired position by the two jaws h and i which close upon the
blank without clamping it sufficiently to prevent it from turning upon itself. Then
the dies T and T' commence their operation of rolling the screw thread, and
before this operation is terminated the jaws and i have been opened again so
that when the screw is finished it will drop and leave the machine through the hole E.
Motion is communicated to the bar e by the levers, the rod k provided
with a spring, the levers l m nr the spiral spring o fixed at a point p of the frame
of the machine, and the disc N which has at its circumference the necessary bosses.
To this end the pin g on the lever m which moves upon the axis s is always pressed
against the circumference of the disc, owing to the spiral spring o. The movement
for opening and closing the jaws h and i is produced by the levers r and t, the
lever t oscillating upon the point u.
Having now particularly described and ascertained the nature of this said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondents, I declare that what I claim is :-
.
First. In a machine for rolling screw threads the construction and combination of
driving rods with driving wheels, said rods being adapted to actuate screw dies and
to impart to the latter exactly equal velocities, one of the dies being acted upon
directly and the other by a bar guided in a straight line and fixed at a point
substantially as hereinbefore described and shown in the accompanying drawings.
Second. In a machine for rolling screw threads the construction and combination
of an automatic distributor placed above the screw dies, which consists of a bar
having a cavity designed to receive the blank of the screw this bar being actuated
by a rectilineal movement in order to present the said blank above an orifice, holding
it suspended above this orifice until a pusher actuated by a spring pushes the said
blank from the cavity of the bar, in order to let it drop into a hole the lower orifice
of which corresponds with the intermediate space left between the two dies
substantially as described and shown.
Third. In a machine for rolling screw threads the construction and combination of a
movable scoop having a vertical movement in a reservoir or hopper containing blanks
of screws, the said scoop presenting the form of a triangle the upper side of which
has a deep groove extending the entire length of the same for the purpose of
collecting the blanks of the screws when by its downward motion the scoop has
brought its upper side to a level with the bottom of the reservoir, substantially
as described and shown.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.