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Патент USA US3031555

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April 24, 1962
3,031,545
L. G. WALLER
IMPACT SWITCH
Filed Oct. 19, 1955
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INVENTOR.
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By
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Lune, GLM/aller
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3,@3 1,5455
Patentedl Apr. 24, 1962
2 ,
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upper assembly with the fingers of each assembly disposed
in interdigitated relation with the lingers 18 of Áthe other
3,031,545
IMPACT SWITCH
assembly and out of contact therewith. As shown the
lingers 18 of the lower assembly are arranged 45° out
of phase with the fingers of the upper assembly.
As shown in FIGURES 2 and 3 the free ends of the
lingers 18 of the lower assembly overlie the inner ends
of the bores Sil in the upper assembly and the free ends
Lyle G. Walier, Clinton, ill., assigner, by mesne assign
ments, to National Union Electric Corporation, Starn
ford, Conn., a corporation of Deiaware
Filed Oct. 19, 1953, Ser. No. 387,020
14 Claims. (Cl. Zim-_6145)
VThis invention relates to switches and has particular
or" the springs 18 of theupper assembly overlie the inner
reference to such a switch which is constructed and ar
ranged to close as »a consequence of a predeterminedy ac
ends of the bores 30 of the lower assembly Aso that the
free end of each spring linger 18 is disposed inwardly
celeration or deceleration of such switch in any direc
of a weight 32 and in the inward path of movement there
of. As shown in FlGURE 2 the free ends of all of the
spring lingers are biased outwardly so as to bear against
tion. `
The construction herein disclosed provides numerous
functional and manufacturing advantages.
the inner surface of the cavity 22. The upper ends of
the fingers 18 of the lower assembly `11i are spring biased
A principal object of the invention is to provide a new
and improved impact switch.
out of engagement with the upper Contact 16 and the
Another object of the invention is to provide an impact
free ends of the spring fingers oi the upper assembly 10
switch which is simple in construction, easy an manufac
are biased out of engagement with the cont-act 16 of the
ture, dependable in operation and which will close upon 20 lower assembly.
,
a predetermined acceleration or deceleration in any di
lt will also be noted that the series of weights '32 of
rection.
the lower assembly itl are arranged to move in diverging
Other objects and advantages of the invention will be
paths with respect to the weights 32 of the upper as
apparent from a consideration of the following specifica
sembly. Each of theweights 32 is normally held against
tion taken in conjunction with the accompanying drawing
inward movement by the end of the spring linger `18 which
of which there is one sheet, and wherein:
obstructs its inward path of movement, The mass of
FlGURE 1 is a partially exploded perspective View of
the weights 32 with reference to the stiffness of the spring
a switch embodying the invention with parts thereof
ñngers 18 is such that a predetermined accelerationv or
broken away; and
_
deceleration of the switch is required to cause a weight
FIGURE 2 is a fragmentary sectional view taken along 30 32 to move inwardly and to move its associated finger
the line 2--2 of FIGURE 1; and* j ì
18 into engagement with the adjacent Contact 16. It
FIGURE 3 is la perspective view illustrating the operat
will be noted that each of the weights is arranged to en
ing parts of the switch.
.
,
gage its adjacent linger at a pointspaced from the point
As illustratedin the embodiment of the invention se
of engagement of such linger with the adjacent exposed
lected for purposes of illustration, the Switch comprises
Contact 16. This permits the finger 18 to yield under
in general two substantially identical assemblies 1€) which
the impact of the weight 32, thereby permitting a longer..
may be enclosed in an insulating tube 12. The upper
period of contact between the linger ‘18 and the contact
assembly 10 as illustrated comprises a hollow body 14
16 than would otherwise be the case. The step in the
of an insulating material, a switch contact 16 and a series
contact 16 provides a limit for the movement of spring 18.
The Iarrangement of the weights 32 «as shown and the
_of spring iingers 1S disposed about the contact -16 and in
current conducting relation therewith. The lingers 13
are disposed in parallel relation and project away from
the contact 16.
y
number employed provides a switch construction in which
a predetermined acceleration or deceleration in any di
rection will ’cause one of the weights toy move the end of
.
As shown in FlGURE 2 a hollow rivet 26B which ex
the adjacent finger lying in its path of movement into en
tends through a central opening in the wall of the body 45 gagement with the adjacently disposed contact 16 to close
1,4` secures the contact 16 within the cavity 22 of the body
the switch. Depending upon the application, the number
14. The spring lingers 18 as shown in FIGURE 3 may
of lingers 18 and weights 32 may be increased or de
.be formed integral with a collar 24 which is clamped
creased. The design'of the switch provides spin saftey
Vbetween the contact 16 and a shoulder on the rivet 20.
» through any axis of rotation of the switch from its geo<
metric center to any axis of rotation displaced not farther
A lock washer -26 is clamped between the head 28 of the
rivet and the outer surface of the wall of the body 14 so
as to prevent rotation of the rivet 2li and the spring fingers
18 about the> longitudinal axis of the switch. The body
14 is provided with -a series of bores 30, there being 4
bores in the body 14 as shown. Aweight 32 is slidably
positioned in each bore 30. As shown the bores 3d each
from the geometric center than the center of gravity
of any of the sliding weights. The forgoing switch de«
sign may be employed to cover a wide range of perform
ance by altering overall size and/ or materials.
While I ‘have illustrated and described a preferred em»
bodiment of the invention, it is capable of modiiication
lie on an axis at 45° with respect to the longitudinal axis
of the switch and the bores 30 are arranged in an annular
and therefore I do not wish to be limited to the details
set forth but desire to avail myself of such changes and
series spaced 90° apart.
60 alterations as fall within the scope of the following
The lower assembly 10 is identical with the upper as
claims.
'
sembly 10‘ which has just been described. The assemb
Y
lies 10 as illustrated in FIGURE 1 are provided with
y
l. An impact switch comprising a first contact having
a series of spring fingers disposed thereabout and in cur
axially extending grooves 36 in the periphery thereof for
accommodating a dowel 38 so that the upper and lower
I claim:
65
' assemblies may be assembled in proper relation.
The assemblies 10 are assembled so as to bring the parts ,
Y thereof in the relation as illustrated in FIGURES 2 and 3
rent conducting relation therewith, said lingers being dis
posed in parallel relation and projecting away from 'said
contact, a second duplicate contact having a duplicate
series of spring iingers, said contacts being oppositely dis
wherein the free ends of the spring fingers 18 of the
posed in spaced relation on a common axis with the iin
upper assembly project into the cavity ZZ of the lower 70 gers of each contact disposed interdigitated relation with
assembly and the free ends of the spring fingers 18 of
the lower assembly project into the cavity 22 of the
the fingers of the other contact but out of contact there
with and with he ends of the fingers of each series dis
3,031,545
3
posed opposite the other'contact and out of'engagement
i with, and a series of movable weights d'lposed adjacent .gl ‘
therewith, and two series of movable Weights, _one dis
posed adjacent the ends of each series of fingers, eachv of Y
sald fingers, each of said weights being releasably secured ' `
said weights being releasably secured against movement
of a predetermined acceleration or deceleration of said ~ -
andV arranged lto move as a consequence of a predeter
mined acceleration or deceleration of said switch, and
against movement and arranged to move as a consequence f
switch, and means constrainingsaid weights-for move
¿ ment in diverging paths, said weights being so Vdisposed
means" constraining said weights for movement in diverg
ing paths, said weights being so disposed with respect to
‘with respect to said fingers so that each finger is in the
willl cause at least one of said weights to move the end of »
. said contact member, said diverging paths being disposed
path of movement of a weight and so that a predeter~
mined nonrotational acceleration or decleration of said
said fingers so that the end of each finger is in the path
of movement of a weight and so that a predeterminedac 10 switch will cause at least one of said weightsto move the
finger vlying in its path of movement into engagement with
celeration or deceleration of said switch in any direction
with- the‘adjacently disposed contact.
posed at an angle other than normal to said line. , Ä
2. A switch ‘according to claim 1 wherein said means
Vcomprises a switch housing provided with two series of
bores, each of said bores having one of said weights dis
posed therein.
9. A switch according to- claim 8 wherein‘said weights
are disposed outwardly of and around said fingers.l f
10. An impactswitch comprising a pair of fixed con
V3. A switch according to claim 1 wherein said weights
are disposed outwardly of and around said spring fingers.
series of fingers disposed thereabout, each of said fingers
4. An impact vswitch comprising a first contact having
a series of fingers disposed thereabout, said fingers being
being arranged in current conducting relation With one
of said contacts and out of current conducting relation
with the other, and two series of movable weights, each
tacts disposed in spaced relation on a common axis, a
- disposed in parallel relation, a second duplicate contact
of said weights being releasably secured against movement
having a duplicate series of fingers, said contacts being
and arranged to move as a consequence of a predeter
oppositely _disposed in spaced relation ony a common axis
l, `with the fingers of each contact disposed in interdigitatedv
vrelation with the fingers of the other contact but out of
contact therewith and with the fingers of each series dis
mined nonrotational acceleration of said switch, and
means constraining said weights for movement in diverg- `
ing paths, said weights being so disposed with respect tov
said fingers so that each finger is in the path of movement
posed opposite the other contact'and out of engagement
therewith, and a plurality of movable weights, each of
of a weight and so that a predetermined acceleration or
deceleration of ,said switch in any direction will cause at `
least one of said weights to move the finger lying in its `
>said' weights being arranged to move as a consequence of
a* predeterminedV acceleration or deceleration of said
path of movement into current conducting engagement
switch, said weights being so disposed with respect to said
fingers so that 'each finger is in the path of movement of v
' with the adjacently disposed contact Vso as to close said
y. a weight and so that a predetermined acceleration or de
celeration of said switch in any directionwill cause at
` least one of said weightsY to move the finger lying in its
path rof movement into engagement with the adjacently
ffdisposed contact;
~
y
.
symmetrically with'respect to a line passing through’the
geometric center of< said switch and said paths being dis~
,_ the finger lying in its path of movement into 'engagement
ì
switch, said weights and fingers being symmetrically dis-.l `
posed with respectgto said common axis.
-
.
l1. A switch, according to claim 10 wherein said ¿
weights are disposed outwardly of and around said fingers.
12. An impact switch comprising a pair of contacts dis»
` 5f. AY switch according .to claim- 4 wherein each of said 40 posed in‘ spaced relation on a common axis, a series of
vweigh-ts movably engages a finger at a point spaced from
spring fingers symmetrically disposed thereabout, each of
the point of engagement of such finger with the adjacently
disposed contact.`
said fingers being arranged in current conducting relation
with one of said contacts and out of current conducting
6. An impact switch comprising a contact member hav
relation with the other, and actuating means releasably se-N
ing a lseries of spring fingers' disposed threaboutand in 45 cured against movement by said fingers and arranged to
current conducting relation therewith, said fingers being
move as a consequence of a predetermined acceleration
disposed in parallel Vrelation and projecting away from
or deceleration of said switch in any direction, said means
said contact memberg'a second contact member, said con
being so disposed with respect to said fingers so that a
predetermined acceleration or deceleration of said switch Y
tact members being disposed in spaced relation on a com
mon axis with the ends of the fingers disposed opposite 50 in any direction will cause at least a part of said means ‘to
the second contact member and out' of engagement there
move one of said fingers into current conducting engage
with, a series of movable Weights disposed` adjacent said
ment with the adjacently disposed contact so as to close,
fingers, each of said weights being releasably secured
said switch.
'
.
against movement and arranged to move as a consequence
13. A switch according to claim 8 wherein said weights:
55
of ay predetermined acceleration or deceleration of said
are releasably secured against switch closing movement
switch, and means constraining said weights-for move
by said fingers.
v
'
ment in diverging paths, said weights being so disposed
i 14. A switch according to claim 8 wherein said weights f
with respect to said fingers so that each finger is in the
are so disposed that rotation of said switch about any
path of movement of a weight and so that a predeter 60 axis passing between the centers of gravity of said weights
mined acceleration or decleration of said switch will cause
will not cause any of said Weightsto move any of said
v at least one of said weights to moveithe finger lying in its
fingers into engagement with said Contact member.
path movement into engagement with the adjacently dis@r
posed contact member.
References Cited'in the ñle'of‘this patent "
`7. A switch according to claim `1 wherein said means
comprises a switch housing provided with bores, each of Y65
UNITED Vsfr-Aras PATENTS
,
said boresv having one of said weights disposed therein;
1,383,079
oressau ___ __________ __ rune 28, 1921 ‘
8. Anfv impact switch comprising a series of fingers, a
fixed contact member, said Vcontact member and fingers
2,458,478
`Maneval _____________ __ Jan. 4, 1949
being disposedwith the fingers arranged symmetrically
2,573,199
Holman ______ __-____ __ -ocn 3o, ¿1951L i
_around the contact member and. out of engagement there 70 2,714,674
Richard ___________ _.`_-_ Apr. 10,195.6; »i
.
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