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Патент USA US3037388

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3 93mm
June 5, 1962
Filed Dec. 5,,1960
2 Sheets-Sheet 1
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BY @Ikhmmw
June 5, 1962
Filed Dec. 5, 1960
2 Sheets-Sheet 2
United States
Patented June 5, 19482
of the mechanism without freeing the other portion, thus
preventing accidental breakage.
Gilbert F. Hill, Skaneateles, N .Y., assignor to LAB.
forporation, Skaneateles, N.Y., a corporation of New
Filed Dec. 5, 1960, Ser. No. 73,793
2 Claims. (Cl. 73-—71.6)
A still further object is to provide a machine in which
the disabling mechanism for each type of motion ef
fectively locks the disabled pivots against unwanted play
occasioned by bearing clearances.
Other objects and advantages will become apparent
from the following description taken in conjunction with
the accompanying drawings, in which:
This invention relates generally to vibration test equip
FIGURE 1 is a side elevational view of a machine
ment, and more particularly to a novel mechanical
embodying the present invention, certain parts being
brute-force type vibrator easily and selectively adapted
shown in section on the line 1—1 of FIGURE 2 and
for circular synchronous motion or vertical straight line
being positioned for circular synchronous motion;
reciprocal motion.
FIGURE 2 is a fragmentary plan view of one side of
the machine of FIGURE 1 with the platform removed;
_ '
Testing machines of this type are particularly useful
in simulating the vibration to which packaged articles
are subjected during transportation, whether it be by
train, truck or airplane. The article to be tested is placed
on a carrier table or platform which is then subjected
FIGURE 3 is a view similar to FIGURE 1 showing a
portion of the machine with the parts adjusted for vertim
cal linear motion;
FIGURE 4 is a fragmentary sectional view taken sub
to vibrations induced in the platform by eccentrics N 0 stantially along line 4—4 of FIGURE 1;
FIGURE 5 is a fragmentary sectional view taken sub
mounted on motor driven shafts.
stantially along line 5'—5 of FIGURE 1; and
Since the vibrations to which a packaged article is
FIGURE 6 is a fragmentary sectional view taken sub
stantially along line 6-6 of FIGURE 1.
shocks and side to side motions, machines which produce
Referring more particularly to FIGURES l and 2 the
a combination of such motions, comprising a circular 25
vibrator 10 is shown as having ‘a rectangular base 11 of
synchronous motion, are most frequently used for trans
welded channel construction adapted to be bolted to a
portation simulating purposes. Such machines may com
floor and a rectangular platform 12 of approximately the
prise the usual platform mounted on rigid legs which are
same size, generally of rectangular tubular members 13
given a circular motion in vertical planes by mounting
most frequently subjected are a combination of vertical
30 welded into a sub-?oor to which wooden planks 14 are
them on eccentrics which are driven synchronously.
bolted to simulate the usual train or truck ?oor.
Since the most frequent shocks to which a packaged
article is subjected are usually the vertical ones, test~
ing machines which only vibrate the platform substan
The platform 12 has one of the inverted U-shaped
brackets 15 and 16 bolted thereto at 17, at each of the
four corners. Each bracket has a ‘depending leg or con
tially vertically are also in demand. Such machines may
be conveniently made by an adaptation of the circular 35 necting link 20 pivotally secured thereto for support
ing the platform on the base. The connecting link 20
synchronous machine. The rigid legs of the latter ma
is embraced between the pendant sides of each bracket
chines are given a pivot on an axis normal to the plane
and a pivot pin 21 extends therethrough. An appropriate
of the circular motion and the platform is anchored so
heavy duty bearing 22 is provided for each link.
as to be restrained from side-to-side motion by a sub
stantially horizontal lever pivoted at either end where 40 Each link 20 at its lower end has a larger bearing 23
by the platform remains free to rise and fall substantial
and is rotatably supported on an eccentric 24 on one
ly vertically.
of two shafts 25. The shafts 25 extend across the
machine at either end and are rotatably supported in
Machines have been developed heretofore which may
the usual pillow block bearing supports 26 which ‘are
vibration and for vertical vibration. By providing a side 45 bolted or otherwise secured to the base 11.
It will be understood that the shafts 25 are provided
to-side pivot to disable the horizontal stabilizing lever
with sprockets outside the base frame with a connecting
and bolt means to selectively render this disabling pivot
be selectively adapted for both circular synchronous
ineffective, and by providing bolt means for disabling
the leg pivots, machines have been adapted for alterna
tive use as circular synchronous or vertical linear
Such machines are subject to various defects.
bolts are located under the machine and are dif?cult to
get at. Considerable time is necessary to convert the
machine from one type of motion to the other.
Fre 55
quently one set of bolts may be inserted and one or more
bolts of the other set may not be removed resulting in
shearing of the bolts and damage to the machine. Fur
thermore bearing clearances, which are necessary when
pivots are provided, result in distortion of the theoreti
cally imparted motion and the use of bolts in itself may
result in a similar distortion of the desired motion.
chain and means including a motor, all not shown, or with
other means for synchronously rotating the two shafts 25.
Brackets 15 and 16 on each side of the machine may be
braced by a connecting bar 27 secured to the brackets at
either end as shown in FIGURE 2, the other side of the
machine being a mirror image of the side shown in
The two brackets 15 at one end of the machine are
longer than the brackets 16 at the other end for also em
bracing the pendant stabilizing links 30 which are pivotal
ly secured to the brackets 15 by the pins .31 and are pro
vided with suitable bearings 32.
The lower end of each link 30 is bifurcated or provided
with a central slot 33 as shown (FIGURE 5), and a sub
stantially horizontal guide link 35 is pivotally secured in
the slot by a pin 36, a suitable bearing 37 being provided.
The principal object of the present invention is, there
fore, to provide a vibration-imparting testing machine 65 The other end of link 35 is similarly pivotally secured in
a forked bracket 38, provided with a slot 39 (FIGURE
which may be quickly and easily converted from a cir~
6), a pin 40 and bearing 41. Bracket 38 is welded or
otherwise secured to base 11.
Above the links 20 and 30 in the brackets 15, there is
also provided a sliding stop or lock element 45 for selec
is economically constructed, in which the conversion from 70 tively locking or disabling the pivots 21 or 31 of the links
one type of motion to the other is made by external con
20 and 30 respectively. Lock element 45 is generally
cular synchronous motion vibrator to a vertical linear
motion vibrator, and vice versa.
Further objects are to provide such a machine which
trols and in which it is impossible to disable one portion
wedge-shaped and its downwardly facing wedge surfaces
46 and 47 are adapted to engage and lock against the
slightly inclined top surfaces 48 and 4-9 of the links 20
and 30 as the element 45 is moved to the right (FIGURE
1) or left (FIGURE 3) and the links 20 and 30 are ver
tically disposed.
As will be apparent to those familiar with the art, the
invention may be embodied in other speci?c forms with
out departing from the spirit or essential characteristics
thereof. The embodiment disclosed is therefore to be
5 considered in all respects as illustrative rather than re
strictive, the scope of the invention being indicated by
the appended claims.
For moving the lock 45 back or forth, a rod '50 is pro
vided, threadedly engaged with lock 45 and supported in
the platform 12 by straps 51 and 52 welded or otherwise
What is claimed is:
secured to the bracket 15 and depending angle iron 53 of
1. In a vibration testing machine having a base, a plat
the platform, respectively. Collars 54 locked to rod 50 10 form, means for supporting said platform on said base
are provided on either side of the strap 51 so that the
including at least one leg, at least one shaft rotatably
rod 56 may act as a worm to advance or withdraw lock
element 45.
mounted on said base and having an eccentric thereon,
said leg ‘being rotatably mounted on said eccentric; the
A sprocket 55 is secured to each worm 50 and a chain
improvement comprising at least one pendant stabilizing
56 may connect the sprockets so the two locking mecha~ 15 link pivotally secured to said platform at one end and
nisms can be operated as a unit.‘ A ha_n_c?_e.57 is provided
pivotally connected to a substantially horizontal guide
at the outside of the machine for turning each worm 50.
link at the other end, the ‘other end of said guide link
It will be apparent that other mechanism such as an
being pivotally secured to said base, said leg being piv
eccentric pivoted lever or hydraulic means could equally
otally secured to said platform adjacent said stabilizing
well be used to operate the lock 45.
20 link, said pivotal connections ‘being axially parallel to
The operation of the machine will now be apparent.
the axis of said shaft, stop means movably mounted on
When the lock 45 is moved to the right as shown in FIG
said platform between said leg and said stabilizing link,
URE l, the machine operates as a circular synchronous 7 and means for moving and securing said stop means from
vibrator. The surface 46 on the lock element engages
a ?rst position engaging and locking said leg with re
surface 48 on the connecting link 20 and effectively locks 25 spect to the platform, to a second position engaging and
link 20 in vertical position by disabling the pivot 21.
locking said ‘stabilizing link with respect to the platform
whereby said machine is adapted for circular synchronous
motion when said stop member is in said ?rst position
and adapted for vertical linear motion when said stop
When rotary motion in unison is imparted to the shafts
25 the platform 12 is carried by the now rigid legs 20 in
a circular vibratory path by the eccentrics 24.
When the lock 45 is moved to the left as shown in 30 member is in said second position.
FIGURE 3, the pivot 21 is freed and surface 47 of the
2. A vibration testing machine having a base, synchro
lock engages surface 49 on the stabilizing link 30, lock
nously rotating shafts supported at either end thereof,
ing the link in a vertical position and effectively disabling \gq?ntri?mqliheach shaft at the four corners of the ma
pivot 31. The connecting links 20, now being pivoted at
chine, a platfo‘?fifanwupstanding connecting linkmr‘o-"i
21, the platform 12 rises and falls with the eccentrics 24 35 tatably supported on ezagllpegcuentric, each link being piv
but is restrained from side to side motion by the guide
otally connected to said platform, pendant stabilizing
link 35. The motion of the platform is substantially a
links pivotally secured to said platform adjacent the legs
vertical, straight line reciprocatory vibration, actually
slightly arcuate since the pivot 36 moves on an are, but for
all practical purposes in a straight line.
When the lock is moved to disable pivot 21 as in FIG
at one end of said machine, a substantially horizontal
guide link pivotally connected at one end to each of said
40 stabilizing links and at the other end to said base, a
URE l, the connecting linkage is thereby disabled since
wedge-shaped stop member horizontally slidable in said
platform between each stabilizing link and the adjacent
the link 20 becomes a rigid leg. Freeing of the pivot 31
leg, a worm threadedly engaged with each of said stop
also renders the stabilizing linkage inoperative, since the
members, and means located adjacent an edge of said
stabilizing linkage, comprising links 30 and 35, is only 45 platform for turning ‘said Worm, said stop member being
effective when the pivot 31 is disabled and the link 30 is
locked to the platform as in FIGURE 3.
Moving the lock 45 to the left, however, makes both
movable from a ?rst position engaged with at least one
of said connecting links for disabling the pivoted connec
tion thereof ‘to said platform to a second position en
the connecting linkage and stabilizing linkage effective
gaged with said pendant stabilizing link for disabling the
again by disabling pivot 31 and freeing pivot 21 to make 50 pivoted connection of said stabilizing link with said plat
the connecting link 20 effective as a link.
It will now be seen that there has been provided a vi
brator which can quickly and easily be converted from
circular synchronous to straight line reciprocal motion,
which is trouble free in that the same locking element 55
locks one linkage while freeing the other, and which elimi
nates any play caused by bearing clearance in the locked
pivot by effectively clamping the pivoted member against
the pivot itself.
References Cited in the file of this patent
Larsen ______________ __ Mar. 30, 1948
Great Britain ________ __ Dec. 11, 1957
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