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Патент USA US2134717

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Nov. 1, 1938.
'
H, J_ HAMMERLY
’
2,134,717
ELECTRIC SWITCH
Filed Dec. 51, 1937
2 Sheets-Sheet 1
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INVENTOR
jiél‘mw?effidimnereZ/z/
BY
%3RNEY
NOV. 1, 1938.
‘H, J, HAMMERLY
‘ELECTRIC
2,134,717
SWITCH 7
Filed Dec. 31, 1957'
2 ‘Sheets-Sheet 2
_
INVENTOR
?emmmlj’wwmergy
BY
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.
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1 M"
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RNEY
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Patented Nov. 1, 1938 -
‘ 2,134,717
UNITED STATES
PATENT vOFFICE
2,134,717
ELECTRIC SWITCH
Herman John Hammerly, New Britain, Conn, as
signor to The Trumbull Electric Manufacturing
Company, Plainville, Conn., a corporation of
Connecticut
Application December 31, 1937, Serial No. 182,672
12 Claims. (Cl. 200-451)
D
My invention relates to knife blade switches
and especially to those having hinged blades.
The main object is to protect the switch against
damage from arcing by reducing the possibility of
arcing.
A special object is to provide simple and inex
pensive means for this purpose.
-
Another object is to provide arc preventing
means which can be readily removed for inspec
10 tion and replacement of the stationary switch
contacts.
,
.
In its preferred form the invention contem
plates an insulating base for supporting the sta
tionary contacts and terminals and the movable
blades or switch members. This base is provided
I4 are secured to the terminals l2. The switch
blade member I5 is hinged to the post RE which
is connected to terminal l3.
The blades are actuated in any suitable man
ner for instance by the crank I'I, handle l8 and
quick-make and break mechanism IQ of any suit
able type. The base has side walls 20, 20 and in
termediate walls 2| , 2| (for a three wire system).
Between adjacent walls are longitudinal passages
or recesses 22, 22 in which the contacts l4 and 10
terminals H‘ for each circuit are located so that
they are separated from each other.
The transverse barriers 23 of insulation are
detachably mounted in grooves 24 in adjacent
walls and extend down to the terminal plates be
with upstanding walls with recesses or passages I tween the binding posts and the respective sta
tionary switch contacts. A transverse rib 25 ex
between them in which are mounted circuit ter
minals and stationary contacts in line with the tends across the base between the side walls and
switch blades.
20
beneath the'switch contacts.
'
An L-shaped guard is secured over these walls
to partially enclose the switch contacts. These
guards are slotted for the passage of the switch
blades. I also preferably provide transverse bar
riers between the adjacentlwalls and separating
25 the stationary contacts from the binding posts
of the line terminals. A ledge is also preferably
provided along the foot of the guard.
The invention is illustrated as applied to an
enclosed switch with quick-make and break
30 mechanism but the invention is not limited to
such structures.
Fig. 1 is a front view of a switch embodying
the preferred form of my invention in a switch
box, ‘the cover being open and parts broken away
and parts in section.
I
I
Fig. 2 "is a vertical sectional view on the plane
of the line 2--2 of Fig. 1.
Fig. 3 is a horizontal section of the switch
mechanism on the plane of the line 3—3 of Fig. 1.
Fig. 4 is an exploded perspective view showing
40
the principal parts of the invention.
Fig. 5 is a front view of a simpler form of the
invention, parts being broken away and shown in
section.
.
Fig. 6 is a vertical section on the plane of the
line B-—6 of Fig. 5 showing the switch blade in
the open circuit position.
Fig. ‘2 is a horizontal section on the plane of
the line 'l-‘l of Fig. 5;
50
A guard member
consisting of a horizontal top plate 26 and a ver
20
tical lower plate 21 is provided. This may be
made of a single piece of insulating material in
L-shaped section and have the top plate mounted
on the outer surfaces of the walls or partitions
2|, 2| and extend between the side walls 20, 20 25
so as to largely enclose the stationary contacts.
This guard serves to hold the barriers 23 in place. >
An additional top plate 28‘ is also preferably
provided to span the side walls 20, 20. These top
plates are secured in place by screws 29, 29 which 30
pass through them. The topplates are provided
with slots 28' and 26’ and the lower ?ange 21
has slots 21’ so as to allow for the movement of
the tips of the switch blades into and out of the
35
stationary contacts.
The enclosure of the stationary contacts in this
manner serves to minimize the formation of arcs
and to snuff out any which tend to form when'
the circuit is broken. The barriers 23 prevent
damage to the binding posts I 5 and to the con
ductors. In case of need the guard members and
barriers can be readily removed for inspection
and repair.
In the form shown on the second sheet of draw
logs, the base 30 and the piece 3| carry the con
ducting parts and are suitably mounted in the box
32. The circuit terminals 33 and 34 are suitably
secured to the insulation. The fuse clips 35 and
36 are also secured to the insulation in any suit
Fig. 8 is a perspective view of the guard mem
able manner for receiving fuses such as 31.
her.
,
The stationary contacts 38 are adapted to re
The switch base 9 is of insulating material and ceive the movable ends or tips of the switch blade
secured in the box I II by screws H, II. The cir
members 38. which are hinged to the posts 4.
cult terminals and binding posts l2 and 13 may , which in turn are connected to the fuse clips 35
be of any suitable form. The switch contact jaws in the usual manner.
2
2,134,717
The movable switch members are actuated in
any suitable manner for instance by the crank
4i, handle 42 and quick-make and break mech
anism 43.
The base has side walls 44, 44 and the inter
mediate walls 45, 45 (for a three wire system)
other ?ange extending adjacent the base and
having its slots in line with the switch blades, ‘a
shoulder extending between the guard /and the
switch blades and transverse insulating members
the block or base 30 is secured to the box by one
or more screws such as 46. Between adjacent
walls are recesses or passages 41 in which the
stationary contacts and the respective circuit
terminals are mounted so that adjacent contacts
are separated from each other and adjacent ter
minals are also separated from each other.
The guard 50 is of L-shaped section having a
15 top plate or ?ange 5| and a lower plate or ?ange
52 and is held in place removably on walls 45,
45 by one or more screws 53.
The ends of the
guard may also be supported in grooves 54 in the
side walls. The walls 45 may have projections 55
20 extending between adjacent switch blades. The
guard is slotted at 58 to ?t the projections 55.
A rib 57 projects from the base just below the
edge 52 of the guard so as to afford additional
support for the guard and to assist in stopping
25 arcs.
The guard is slotted at 58 in line with the paths
of the switch blades so as to provide a minimum
clearance and thus tend to prevent the formation
of arcs when the circuit is opened. These slots
30 may be formed in any suitable manner for in
stance by milling or cutting in the proper places.
When the guard is in place it completely covers
the stationary contacts but may be readily re
moved for inspection and replacement of the sta
35 tionary contacts and the terminals.
I claim:
1. An electric switch having an insulating base
with upstanding walls and longitudinal recesses
containing terminals and switch contacts be
40 tween the walls, hinged switch blades adapted to
coact with the contacts and a slotted insulating
guard of L-shaped cross section having one ?ange
extending along the tops of the walls over the
switch contacts and the other ?ange extending
45 toward the base and having its slots in line with
the switch blades.
2. An electric knife blade switch having a base
with upstanding walls and recesses containing
switch contacts and terminals between the walls,
hinged switch blades adapted to coact with the
contacts, a slotted insulating guard having one
?ange extending along the tops of the walls over
the switch contacts and another ?ange extending
toward the base and having its slots in line with
the switch blades, and an abutment shoulder on '
the base overlapping the lower edge of the guard.
3. An electric knife blade switch having an
insulating base with upstanding walls and longi
tudinal recesses containing terminals and switch
60
contacts between the walls, switch blades adapted
to coact with the contacts, a slotted insulating
guard having one ?ange extending along the tops
of the walls over the switch contacts and an
other ?ange extending toward the base and hav
ing its slots in line with the switch blades, and
transverse insulating members between adjacent
walls and between the switch contacts and their
between adjacent walls and between the switch
contacts and their respective terminals.
5. An electric knife blade switch having an
insulating base with upstanding walls and ion
gitudinal recesses containing terminals and
switch contacts between the walls, hinged switch
blades adapted to coact with the contacts. a
slotted insulating guard of L-shaped cross sec
tion having one ?ange extending along the tops
of the walls over the switch contacts and the
other ?ange extending to the base and having its
slots in line with the switch blades, and trans- verse insulating members between the walls and
between the switch contacts and their respective
terminals.
6. An electric knife blade switch having an
insulating base with upstanding walls and re
cesses containing terminals and switch contacts
between the walls, switch blades adapted to co
act with the contacts, a slotted insulating guard
of L-shaped cross section having one ?ange ex
tending along the tops of the walls over the
switch contacts and the other ?ange extending
to the base and having its slots in line with the
switch blades, transverse insulating members be
tween the walls and between the switch contacts 30
and their respective terminals and an insulating
top plate extending over all of the upstanding
walls.
7. An electric knife blade switch having an
insulating base with upstanding walls and ion 35
gitudinal recesses containing switch contacts and
terminals between the walls, switch blades adapt
ed to coact with the contacts, a slotted insulating
guard of L-shaped cross section having an upper
?ange extending over the switch contacts and 40
another ?ange extending toward the base and
having its slots in line with the switch blades
and a top plate extending over the upper ?ange
of the guard and over the walls.
8. An electric switch having an insulating 45
base with upstanding walls and longitudinal re
cesses containing terminals and switch contacts
between the walls, hinged switch blades adapted
to coact with the contacts, a slotted insulating
guard of L-shaped cross section having one 50
?ange extending over the switch contacts and
the other ?ange extending toward the base and
having its slots in line with the switch blades
and an insulating abutment shoulder on the base
overlapping the lower edge of the guard.
9. An electric knife blade switch having an
insulating base with integral upstanding walls
and recesses containing switch contacts between
the walls, hinged switch blades adapted to coact
with the contacts and a slotted insulating guard
of L-shaped cross section having one ?ange ex
tending along the tops of the walls over the switch
contacts and the other ?ange extending to the
base and having its slots in line with the switch
blades.
.
10. An electric knife blade switch having an
respective terminals.
insulating base with upstanding walls and longi
4. An electric knife blade switch having a base
with upstanding walls and recesses containing
tudinal recesses containing switch contacts and
switch contacts and terminals between the walls,
switch blades adapted to coact with the contacts,
ed to coact with the contacts and a slotted in
a slotted insulating guard of L-shaped cross sec
tion having one ?ange extending along the tops
75 of the walls over the switch contacts and the
terminals between the walls, switch blades adapt
sulating guard of L-shaped cross section having
one ?ange extending over the switch contacts
and the other ?ange extending to the base and
having its slots in line with the switch blades 75
2,134,717
and transverse barriers detachably held between
‘ adjacent walls over the terminals.
11. An electric knife blade switch having a
base with upstanding insulating walls and longi
tudinal recesses containing switch contacts and
terminals between the walls, switch blades adapt
ed to coact with the contacts, a slotted insulating
guard of L-shaped cross section having one ?ange
extending along the tops of the walls over the
switch contacts and the other ?ange extending
toward the base and having its slots in line with
the switch blades, an abutment shoulder on the
base overlapping the lower edge of the guard
and transverse insulating barriers detachably
held between the contacts and the terminals.
3
12. An electric switch having a base with up
standing insulating walls and longitudinal re
cesses containing switch contacts and terminals
between the walls‘, hinged switch blades adapted
to coact with the contacts, a slotted insulating
guard of L-shaped cross section having one ?ange
extending along the tops of the walls over the
switch contacts and the other ?ange extending
to the base and having its slots in line with the
switch blades, transverse insulating barriers be
tween the terminals and the switch contacts and
an abutment shoulder on the base overlapping
the lower edge of the guard.
HERMAN JOHN HALEMERLY.
15
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