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Патент USA US2111308

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Filed June 15, 1957
Patented Mar. 15, 1938
Samuel Baxendale, Dearborn, Mich.
Application June 15, 1937, Serial No. 148,421
2 Claims.
The invention relates to stock advancing
mechanisms used in connection with machine
tools and of the type in which a reciprocating
member is positively actuated through a pre
determined amplitude of movement by mecha
nism timed with the operation of the machine.
With such feeding mechanism the length of ad
vancement must be very accurately adjusted to
correspond to the requirements of the work and
this necessitates a readjustment for each change
in the work. However, a simpler method of ad
justment is to feed the stock bar against an ad
justable limiting stop, but where this is used a
positive feeding means would be disastrous. It
15 is the object of the present invention to obtain a
construction where the actuating means for ad
vancing the stock is positively reciprocated by
the machine through a de?nite amplitude of.
movement, but which, nevertheless, permits of
20 varying the length of feed by an adjustable stop.
To this end the invention consists in the con
struction as hereinafter set forth.
In the drawing:
Figure l is a central longitudinal section
25 through my improved feeder;
Figure 2 is a cross section thereof on line 2-2
of Figure 1;
, Figure 3 is a cross section on line 3—-3 of
Figure 1;
Figure 4 is a side elevation.
As my improvement is applicable to various
constructions of machine tools forming no part
of my invention I shall illustrate only the feed
ing mechanism. As shown in Figure l, A is a
35 tubular member which at its rear end is pro
vided with a threaded nipple B for engagement
with a correspondingly threaded tubular feeding
member C. This member is periodically actu
ated by mechanism not shown, and in timed
40 relation to the machine tool and is reciprocated
through a predetermined amplitude of move
D is a tubular member telescopically en
gaging the member A and having a limited free
dom of movement relative thereto. Preferably,
45 the bore of the member A is enlarged in diam
eter in a portion E to form a shoulder F. The
member D is also provided at its rear end with
an enlargement forming a shoulder G for engag
ing the shoulder F, and a portion H tapering from
50 said shoulder to a diameter less than the internal
diameter of the member A. The member D is
also longitudinally slotted at I to form a bifurca
tion which is su?iciently resilient to permit of a
slight contraction in diameter of the rear end.
55 Thus, by introducing the tapered end H into the
(01. 29-61)
outer end of. the member‘ A and then forcing the
member D inward, the shoulders G may be sprung
into engagement with the shoulders F. At the
outer end of the member D is an enlargement J
which forms a shoulder K, and a spring L sleeved
on the member D extends between this shoulder
and the forward end of the member A, thereby
yieldably holding the shoulders F and G in en
At the forward end of the member D is a one
way clutch.
This is preferably formed by a plu
rality of bores M through the enlarged portion J,
entering through the outer end thereof and in
clining toward the axis, so that their inner ends
intersect with the bore of the member D. In 15
these bores M are placed balls N, and springs 0
bearing against these balls, urge the same toward
the rear end of the bores J. However, the aper
tures formed by the intersection of. the bores J
with the main bore of the member D are not
su?iciently large to permit the balls to drop
therethrough. An abutment for the springs O is
formed by a disk P which is placed in a recess
in the forward end of the enlargement J and is
secured by peening over the margin of this recess
as indicated at Q, or fastening in any other way.
With the construction as described, the balls
N normally project into the bore of the member
D so as to engage a stock bar passed there
Whenever the member A is actuated
in a forward direction through the medium of
the tubular feeder C, the balls N will frictionally
engage the stock bar. This will clutch the bar
so that it will move forward with the members
A and D, the latter being actuated by the spring 35
L. An adjustable stop R extending into the path
of the stock bar will arrest movement thereof,
whereupon the spring L will yield to permit the
continued forward movement of the member A
under the actuation of the member C. Upon
the return movement of the members A and D
the balls N will release the stock bar, but will re
engage the same on the next succeeding forward
The construction as above described is formed
of a relatively small number of elements all of
which are easily manufactured and easily as
sembled. It forms a very effective and positive
feeder for the stock bar, while the resilient ele
ment L permits of arresting movement of the
stock without any injury to the positively actu
ated mechanism.
What I claim as my invention is:
1. A feeder comprising a pair of axially recip
rocatory telescopically engaged tubular mem_ 55
bers through which a stock bar is passed, a stop
member and a hook or shoulder at its inner end
the other resilient means for radially projecting
said ?rst stop permitting of retraction of the
said bifurcated portion being su?‘lciently resilient 5
same when said telescopic members are assem
bled, resilient means for yieldably holding said
members in extended position, and a one-way
clutch carried by the forward member adapted
to engage the stock and to non-positively advance
the same during the forward movement of said
member and to release the stock during the re
turn movement.
inner member having a bifurcated portion for
?tting the small diameter portion of said outer
on one of said members and cooperating spaced
stops on the other of said members permitting a
relatively axial movement of one in relation to
2. A feeder comprising a pair of axially recip
rocatory telescopically engaged tubular members
for engaging said shoulder of the outer member,
to permit of passing said hook or shoulder through
the small diameter portion of the outer mem
her into engagement with the shoulder between
said portion and the large diameter portion, an
enlargement at the forward end of said inner 10
member, a helical spring interposed between said
enlargement and the forward end of the outer
member to resiliently hold said hook and shoulder
in engagement, and a one-way clutch in said en
larged forward end for engaging the stock to 15
through which a stock bar is passed, the outer
advance the same during the forward move
ment of said feeder and adapted to release it on
member having portions of di?erent internal di
ameters with a shoulder therebetween, and the
the rearward movement thereof.
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