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Патент USA US2411059

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Nov. 12, 1946-
c. R-UBENSTEIN
. 2,411,059
WORK HOLD-DOWN DEVICE
Filed Dec. 26, 1944
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Patented Nov. 12, 1946
2,411,059
UNITED
PATENT orriice
‘2,411,059
‘ “WORK HQLD-DQWNDEVICE
,
' :Char-les-i'Rubenstein, Kansas‘City, ‘Mo.,
’ - 'ApplicationjDecember 26, 1944, Serial No. 569,752
' 3 Claims.
(013‘ 90-61)
'1
. “This invention relates to attachments for
‘work-holding ‘machines ' in vthe character of
shapers or the like, and has for-its primary aim
“ to'provide means for‘directly- ‘engaging the ma
terial constituting the work, and ‘for securing
said work not only between *the'retaining clamps
,of ‘the >machine, but tightly againstv the ‘under
lying support.
‘One of the primary- aims of this invention is to
I4 above ‘a bed ‘I6, and movable in;-horizontal
paths thereabove. In- short,‘ the directiomof
travel of clamps ‘I2 and‘ I4 is parallel to the top
of 136C115,‘ whereupon work- IB is, positioned. ~ ‘
- The work, in this instance_,gis- illustratedqasa
polygonal solid having opposed vertical surfaces
20, against which the-hereinafter described‘ hold
down members are forced.
"
The hold-down per se comprisesyajbqdy“ 22
‘ ‘provide a work hold-down for shapers or the like, 10 shaped, in its preferred embodiment as illus
' adapted for re-positiom‘ng between the ~material
and the clamps and having at least one gspecially
formed part, disposed to convert a portion of the
pressure exerted by the clamps into force hold
ing the work against the bed of the machine.
15
This invention has for an even further aim to
provide a work hold-down of the aforementioned
character, which includes a specially disposed
blade, positioned at an angle with respect to the
direction of travel of the retaining clamps, which
blade is resilient, divided into sections, and
specially designed to insure a positive grip and
an engagement that will not accidentally loosen
and which will preclude upward movement of the
work from its normal place upon the surface of
the machine bed.
Other objects of the invention will appear dur
ing the course of the following speci?cation, re
ferring to the accompanying drawing, wherein:
trated in Figs. 2, 3-_and 4, and ‘formed-ofimaterial
‘ capable of ‘withstanding?the pressure- and' having
resilient characteristics’to theend that-the down
wardly and forwardly “inclined *blade ‘24 -con
stituting a part thereof, may ?ex.
In the form illustrated, blade 24 is created by
longitudinally milling body 22 to establish a
groove 26. A tongue 28 is disposed below groove
23 to present a base for body 22. The edge of
body 22 engaged by the adjacent clamps I2 or I4
as the case may be, is longitudinally milled to
form a depression30 on either side of which is a
flat face 32. These ?at faces 32 are in the same
vertical plane and face 34 of tongue 28 is at right
angles to the plane wherein faces 32 are disposed.
The forward lowermost free edge of blade 24
is relatively thin and this edge 36 projects out
wardly beyond the underlying edge
tongue 38.
40 of
Fig. 1 is a front elevational view in perspective 30
When the hold-down is in place, as illustrated
of a work hold-down made in accordance with
in Fig. 1, faces 32 lie against the smooth inner
the present invention and showing the same in
surface of the adjacent clamp and surface 34 lies
operative position on a shaper.
upon the normally horizontal face of bed I6. In
Fig. 2 is a top plan view of the work hold-down
ward movement of the clamp which exerts the
per se.
'
35 force toward work I8, will drive edge 36 against
Fig. 3 is an end elevational view thereof.
work I8 and not only force said work downwardly
Fig. 4 is a cross sectional view through the
against bed I6, but grip the same as would be
hold-down, taken on line IV-IV of Fig. 2; and
the case if only clamps I2 and I4 were used.
Fig. 5 is a similar cross sectional view illus
A number of transverse slits 42 formed in blade
trating a hold-down made pursuant to a modified 40 24 divide said blade 24 into a plurality of sections
form of the invention.
Heretofore horizontally movable clamps for
holding the material constituting work receiving
attention, have failed to maintain the work in
44. Thus, any irregularity of the face of work
I8 against which the hold-down is being moved,
will not eifect the position or function of body
22. On the contrary, the several sections 44 will
a position tight against the upper surface of the 45 ?ex to different degrees to compensate for such
bed of the shaper. It is difficult to supplement
irregularities and a positive inward and down
the clamps or position the same to exert a down
ward pressure will be applied to work I8.
ward pressure, and since such pressure is essen
In the modi?ed form of the invention illus
tial, the hold-down blocks embodying this inven
tion are practically indispensable before the work
can be perfectly set.
In the drawing wherein like reference char
acters refer to similar parts, the numeral Ill
trated in Fig. 5, body I00 carries the ?exible blade
I02 assembled with body I00 after being sepa
rately manufactured. This blade is downwardly
and forwardly inclined however, in the same
manner as is blade 24, and its lowermost free
edge I 04 projects beyond edge I06 of the body. A
designates a shaper of conventional type having
as a part thereof, a pair of opposed clamps I2 and. 55 series of pins I08 projecting upwardly through
2,411,059
3
trated in Fig. 5.
Body I00 is formed to present a fulcrum H4
about which plate I02 may rock. This rocking is
limited by the width of groove “2 and when
pressure is exerted against smooth surfaces H6,
blade I02 will arch and increase the amount of
force that is applied to the work in a direction
toward the supporting underlying'bed I0.
4
allel to the top of the bed, said hold down com
prising a body adapted for positioning between
the work and said clamp, said body having a
openings “0 cooperate with groove H2 in main
taining blade I02 in the operative position illus
?exible, downwardly inclined, transversely arch
able portion formed to convert a portion of the
pressure exerted in said direction into force hold
ing the work against the bed of the machine, said
resilient portion being divided into a plurality of
independent sections allv engaging the work and
10 all receiving pressure from the clamp.
2. A hold down of the character described for
use in material shaping machines having a work
supporting bed and a clamp for exerting pressure
same. The conversion of the pressure exerted
against the work in a direction substantially par
by clamps l2 and [4 into force holding the work
against the bed of the machine,.as well as holding 15 allel to the top of the bed, said hold down ,com
prising a, body adapted for positioning between
the work between the clamps, is the resultcf
Obviously, the basic function of both forms of
the hold-down illustrated and described, is the
using the hold-down blocks, and therefore, there
is no danger of mal-adjustment due to unde-'
- sirable upward displacement of the work.
I the work and said'clamp, said body having a
downwardly inclined ?exible blade formed to arch
as the pressure exerted in the aforesaid direction
The manner of constructing hold-downs made 20 by the clamp is applied whereby a portionof said
accordance with’ this invention; ‘and their
speci?c appearance may be different from that
above described and illustrated in the accom
panying drawing. It is desired, therefore, to be
' limited only by the spirit ofthe invention and 25
scope of the appended claims.
Having thus described the invention, what is
claimed as new and desired to be secured by Let
. ters Patent is:
7 pressure is converted into force'holdingthe' work
against the bed of the machine, said blade'being
. transversely divided into a plurality of independ
ently archable sections.
~
‘
3. A work hold down of the character described,
comprising a unitary body; a resilient bladef'on
the body extending longitudinally‘ along one side
thereof and disposed at an angle to the ‘f ace of one
side of the body and beyond the edge of the body
1. A hold down of the character described for 30 at the lowermost portion ofthe blade, said blade
use in material shaping machines having a work
being divided into a number of sections xcronipris
supporting bed and a clamp for exerting pressure
ing its length.
. against the work in a direction substantially par
1
CHARLES RUBENSTEIN,
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