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Патент USA US2868592

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Jan- 13, 1959
Filed Dec. 51.‘ 1954
‘ 2,868,582
2 sheets-sheet 1
Jan, 13, 1959
Filed Dec. 31. 1954
2 Sheets-Sheet 2
- "@*Q%EY
United States Patent 0
Patented Jan. 13, 1959
extends rearwardly in a direction opposite to that of the
6 base plate 44.
Motors Corporation, Detroit, Mich., a corporation of
Application December 31, 1954, Serial No. 479,084
2 ‘Claims. (Cl. 294-88)
An air cylinder 48 is also secured to the
support member 46 and extends rearwardly thereof with
the rod 42.
A piston rod guide plate 50 is secured to the face of
the support member46 by fastening means 52 and has
a piston rod 54, actuated by air pressures applied within
the air cylinder 48, extended therethrough. The piston
Paul Joseph Loisell, Flint, Mich., assignor ‘to General
rod 54 includes a forked arm connector 56 at the extended
.10 end thereof engaging a carrier 58 and secured thereto
by pin 60.
The carrier 58 is formed to include a relieved section
on its undersurface as at 62. and ?anged side rails 64
and 66 by means of which it may be slidably disposed
This invention relates to material handling devices in 15 upon the base plate 44 and guided within guide rails 68.
general and more particularly to devices for ejecting or
withdrawing stamped members ‘ from metal stamping
and 70 secured to each side of the base. The carrier 58
also includes parallel spaced side walls 72 formed to pro
vide guide walls 76 and 78 near one end thereof and pivot
The removal of metal stampings from large stamping
pin support walls 80 and82, and 84 and 86, near the
presses when performed manually is a dangerous opera 20 other end thereof. A control rod‘ 88 has one end dis
tion. Numerous means'have therefore been proposed
posed between the guide walls 76 and 78 and is retained
for automatically ejecting the stamped members from
' by a pin 90 extended through the rod and received within
such presses without requiring that the operator expose
guide slots 92 and 94 formed within the walls.
himself to danger. Such devices include the Sahlin Iron
other end of rod 88 is threaded within a member 96
Hand shown and described in the United States patent 25 having fork arms 98 and 100 with pin 102 extended
to Sahlin 2,275,561.‘ ‘ The proposed device is an improve
therebetween. A bell crank lever 104 is pivotally sup
me'nt over the mechanical hand used with the Sahlin
ported upon a pivot pin 106 extended between walls 80
apparatus and includes a more e?icient work jaw oper
and 82. One end of the bell crank lever 104 is engaged >
ating means and a more satisfactory arrangement of the
.upon pin 102 and the other end thereof includes a pin
work engaging jaws themselves. ‘
108 engaged within the forked arms 110 of a jaw mem
In the drawings:
her 112.
Figure 1 is a showing of an automatic mechanical arm
having the proposed device adapted for use therewith.
walls 84 and 86 upon a pivot pin 114 and is engaged with
the, bell crank lever 104 by means of slots 116 formed
in the- forked arms 110 thereof and adapted to receive
Figure‘2 is a side elevational view of the proposed
material handling device;
Figure 3 is a side elevational view of the proposed
pin 108‘. The jaw member 112 is, hook-shaped having
device as employed to engage a work member.
‘Figures 4 and 5 are‘ ‘cross-sectional views‘ taken in the
planes of lines 4-4 andv 5-5, respectively, of Figure 2
looking in the direction of the arrows thereon.
The automatic mechanical arm apparatus 10 shown in
Figure l is generally adapted to be secured to the side
The jaw member 112 is pivotally supported between
its workpiece engaging end 118 adapted to engage a work
engaging member 120 secured to the end of the carrier 58. .
A spring member 122, under compression, is engaged 1
between the carrier 58 and the end 124 of rod 88. The
spring member 122 is received within a passage 126
formed through the end of the carrier 58 and closed by
a plug 128 threaded therein. The spring biases the rod
extended downwardly with the pick-off or ejector device
axially to the extent allowed by pin 90 within guide
14 adapted to reach inside the press to engage a work 45 slots 92 and 94 to move bell crank lever 104 so as to
piece. The stamping press is not shown.
maintain the jaw member 112 in the position shown in
The apparatus 10 comprises a control housing 16 in
Figure 2.
cluding an air cylinder 18 and having the air cylinder
A collar member 130 is secured to rod 88 and has a
rod 20 connected to a carriage member 22. The carriage
pin 132 extended therethrough and exposed on each side
member 22 has a bell crank 24 pivotally mounted thereon
thereof. The side walls 72 and 74 of the carrier 58 are
of a stamping press and to have the arm 12 thereof
as at 26.
The bell crank 24 includes a cam follower
roller 28 which is adapted to engage and follow the cam
surface 30 of the housing as the carriage 22 is raised
vertically by air cylinder rod 20. The arm 12 is secured
to the end of the bell crank 24 and includes an. arm
cut away as at 134 to receive the pin and allow limited
travel within the extent allowed rod 88. Stop lugs 136
and 138 are secured upon guide rails 68 and 70 near
55 one end of the carrier 58, and on opposite sides thereof,
for engaging pin 132 and limiting relative movement
between the carrier 58 and base plate 44. The limited
travel allowed the carrier and base plate is shown in
Figure 3. The engagement of lugs 136 and 138 with
pin 132 causes the control rod 88 to be prevented from
further movement with carrier 58. As the carrier con
A ?xture 36 is secured to the end of the arm exten
its outward movement, control rod 88 acts upon
sion 32 for holding the ejector device 14. The ?xture
bell crank lever 104 to close the jaw member 112 upon any
36 includes a screw adjustment means 38 for regulating
workpiece such as 140 disposed between the end 118 of
the angular disposition of the ejector device 14 relative 65 the
jaw and the work engaging member 120.
to arm 12 and a clamp means 40 slidably engaging a
In the operation of the automatic mechanical arm
rod 42 of the ejector device for regulating the stroke
apparatus 10 the air cylinder rod 20 is adapted to lift
length of the device towards the workpiece.
the carriage member 22 causing the cam follower roller
The ejector device 14 includes a base plate 44 with a
28, in following the cam surface 30, to pivot the bell
support member 46 secured to one end thereof. The 70 crank 24 about its pivotal point 26 raising the end of
rod 42, with which the arm 12 of the apparatus 10 is
the bell crank and causing the arm 12 to remove the‘
extension 32 telescoped therein and adjustable with re
spect thereto by means of the adjustment screw 34. A
dash pot cylinder 35 and cylinder rod 37 are secured
between the housing 16 and carriage member 22 to cush
ion the end travel of the carriage member.
connected, is secured to the support member 46 and
ejector device 14 from within the stamping press. The
reverse operation disposes the ejector device within the
stamping press.
As the ejector device 14 is positioned within the stamp
ing press the air cylinder 48 is actuated causing the
piston rod 54 to move the carrier 58 relative to the base 5
plate-44. Thestroke of the ejectordevice-14 is adjusted
so that the work engaging member 120 secured to ‘the
pinging engagement with said control linkage ‘for over»
coming said biasing means and activating said control
linkage to close said jaw member against the terminal
end of said carrier.
2. A work handling device for use with automatic
mechanical arm apparatus and which includes a base
member adapted to be secured to said arm apparatus, a
carrier member slidably mounted upon said base member,
end of the carrier will engage ‘the workpiece 140 at the
a work engaging surface provided at the terminal end
end of its relative movement. The piston rod 54 in
moving the carrier 58 relative to the base plate 44 causes l0 of said carrier, a work engaging jaw ‘member pivotally
mounted near the end of said carrier, a bell crank actu
the pin 132 to be engaged by the stop lugs 136 and 133
ator link pivotally mounted upon said carrier and hav
secured to ‘the base plate. Further forward movement
ing one end thereof connected to said jaw member, a
ofthe carrier member causes the lugs to move the vcon
control rod having one end connected to the other end
trolrrod 88 relative to carrier 58 through collar 1130,
of said actuator link, power biasing means mounted in
against ‘the action of the biasing spring 122. Axial v
and engaged between said carrier and the other end of
movement ofthe rod-88 relative to the carrier 58 is trans
said control link for retaining said jaw member in ,an
lated through the bell crank lever 104 to cause the work
open position through the ‘biased disposition of said
engaging end 118 of the jaw member to engage the work
control and its e?ect upon said actuator link, piston
piece 140 against the end of the carrier member.
cylinder'means connected to said carrier ‘for moving said
The carrier 58 may be returned to its original position
carrier relative to said base member, and stop means
with respect to the base plate 44 by means of the air
provided near the end of said base member for engaging
cylinder 48 at the same time that the mechanical arm
said control rod and moving said rod relative to said car
apparatus. is adapted to withdraw the ejector 14 from
rier for closing said jaw member against the work engag
within the stamping press, or at such other time as is
ing surface of said carrier and engaging a work member‘
convenient and allows the apparatus to ready itself for
therebetween, said ‘work engaging surface and said jaw
picking off the next stamping from the press.
member being juxtaposed when closed to hold said work
I claim:
member in-a plane at the point of engagement normal'to
1. A work vhandling device for use with automatic
the lineof movement of said carrier member.
mechanical arm’ apparatus and which includes a base
member adapted to be secured to and supported by said
References Cited in the ?le of thispatent
arm apparatus, a carrier member slidably mountedupon
said base member,-a work engaging jaw member pivotally
mounted ‘upon one end of said carrier and adapted to
hold a workpiece to the terminal end of said carrier, 35
work jaw control linkage carried 'by said slide member
and connected to said jaw member, power means on
said carrier member biasing said control linkage to retain
said jaw member in an open position, piston cylinder
means secured to said base member and connected to 40
said carrier for moving said carrier relative to said base
member, and stop lug means mounted adjacent the end
of said base member and disposed for cooperative im
Sahlin ______________ __-_ Mar. 10, 1942
.Sahlin ________________ __ Sept. 9, 1952
Miller ________________ __ May 4, 1954
Sehn et a1.‘ ____________ __ Feb. 12, 195.7 1
A publication by Sahlin Engineering C0,, P. O. ,Box '
289, Birmingham, Michigan, entitled “Sahlin ‘Iron Hand
Unloading‘Machines”; 16 pages. Page 16 indicates a
printing'date of January 1954.
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