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Патент USA US3056113

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Sept. 25, 1962
E. R. KULKA
3,055,103
TERMINAL BLOCK
Filed Sept. 14, 1959
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2 Sheets-Sheet 1
FIG I.
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INVENTOR.
EUGENE ,9, (04,64
BY
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krraeA/ps
United States Patent
free
1
3,5§,l03
Patented Sept. 25, 1962
2
larged scale, taken along line 5——5 of FIG. 2 in the direc
3,056,103
tion of the arrows; and
FIG. 6 is a transverse sectional elevation similar to
TEINAL BLGCK
Eugene It. Kulka, Mount Vernon, NY, assignor to Kulka
Electric Corp, Mount Vernon, N.Y., a corporation of
New York
0
Filed Sept. 14, 1959, Ser. No. 839,962
8 Claims. (Cl. 339-198)
FIG. 5, but showing a variation in the structure which
enables it to accommodate stripped wire leads having no
solder lugs.
Referring to FIGS. '1-4, the terminal block of the inven
tion includes an electrically non-conductive body 10‘ made
The present invention relates to improvements in elec
of Bakelite or any desired thermosetting plastic. The
trical connector devices, and in particular to a 'new and 10 body Ill has a bottom wall Ill and pairs of spaced paral
improved terminal block construction.
Terminal blocks are conventionally used to connect
one series of conductors electrically with another series
of conductors, respectively, to provide pairs of electri
cally connected conductors. An ideal terminal block will
satisfy a number of requirements among which are pre
vention of arcing between the terminal block and the
plate on which it is mounted as well as between the elec
lel supporting walls [1-2 extending upwardly from the bot
tom wall Ill with each pair of walls 12 located between
and being integral with a pair of additional walls 1'3‘.
The walls I3 extend upwardly beyond the top supporting
surfaces 14 of walls 12 as well as beyond the end faces 15
of the walls 12, each of these end faces being formed
with a notch 16. The upper surfaces 17 (FIG. 5) of the
notches 16 are directed away from support surfaces 14
trically connected pairs of conductors, prevention of acci
downwardly toward bottom Wall 11, so that each wall 12
dental touching of the exposed electrical components by 20 has at least one pair of surfaces 14 and 17 directed away
personnel, secure assembly of the components of the ter
minal block, as well as requirements such as high strength,
low cost, and ability to accommodate solder lugs or
stripped wire leads having no solder lugs.
Up to the present, it has not been possible to effectively
ful?ll all of these requirements because some of them
conflict. For example, a closed bottom wall is essential
to prevent arcing to the mounting plate, but this closed
bottom wall has so far made impossible a simple secure
interconnection of the terminal block components. Em
bedding portions of electrically conductive plates in the
block body by molding the latter onto the electrically
conductive portions is extremely expensive and neces
sitates tap-ping into plastic. Such tapping is dif?cult to
carry out, leaves chips in blind holes, and requires very
thick Walls. Using fasteners such as drive rivets to fasten
electrically conductive plates to the body of the block
results in cracking of the brittle plastic and fails to pro
vide a permanent secure connection.
An object of the present invention is the provision of
a terminal block capable of ful?lling all of the above
requirements.
Another object of the invention is the
from each other for a purpose pointed out below.
The body Ill is completed by a top wall 18 extending
between the walls 13 over the surfaces 14. Thus, the
body Ill is formed between its top wall 18 and bottom
wall 1d with a row of cells 19 extending through the body
10 from one side to the opposite side thereof, and each
cell 19 has an elongated portion of T-shaped cross sec
tion (FIG. 2) terminating short of the ends of the cell in
end faces 1'5 which are respectively formed with the
notches 16. The support surfaces 14 are located in each
cell 19 at the junction between the lower narrow portion
20 and upper wider portion 2-1 of the cell, and the top
wall 18 is formed with a pair of openings 22 aligned with
the narrow portion '20 of each cell 19.
The body It) is molded in lengths much longer than
indicated in FIGS. 11, 2, and 4 and then is cut into suitable
lengths as shown in FIGS. 1, 2, and 4. The bottom wall
11 has relatively thin circular portions 23 (FIG. 5) re
spectively aligned beneath openings ‘22 and adapted to be
drilled or punched out only at the end cells Il9 of the row
of cells so as to form the bottom wall openings 24 (FIG.
1) for a purpose pointed out below.
provision of a terminal block having a molded block body
The pair of support surfaces 14 in each cell 19 (except
with integral covering plates or walls at the top and
the end cells) carry an elongated eyelet plate 25 made of
bottom thereof.
45 brass, for example, and stamped so as to have, before
1Still another object of the invention is to provide a
assembly with the body 10, the configuration shown in
terminal block which may include lead identifying indicia
FIG. 3. The eyelet plate 25 has at each of its ends a
which cannot be covered by the leads, which can be made
pair ‘of bendable ears 26 and between its ends a pair of
in any desired convenient sizes and of any thermosetting
internally threaded eyelets 27 threaded along their en
plastics, and which will not require the plastic material to
tire length. A pair of screws 28 are threadedly carried
be subjected to the pressure of mounting screws directly
by the eyelets 27, respectively, of each eyelet plate 25.
engaging the plastic material.
The width of the eyelet plate is substantially equal to
A primary feature of the invention resides in providing
the width of the upper portion 21 of each cell 19. Before
eyelet plates having bendable ears crimped into notches
assembly vwith body ‘10, the ears 26 at one end of eyelet
of the body of the block to connect the plates securely 55 plate 25 are preformed to extend downwardly at a right
thereto while at the same time providing the block body
‘angle to the adjoining plate portion and terminate in tips
With a bottom Wall which is closed beneath the eyelet
29 extending at 45° to the adjoining portions of cars 26,
plates.
Additional objects and advantages of the invention- will
become apparent in the course of the following speci?ca
tion, when taken in connection with the accompanying
drawings, in which:
FIG. 1 is a top plan view of a terminal block made ac
cording to the present invention;
FIG. 2 is a side elevational View of the structure of
FIG. 1;
7
FIG. 3 is an exploded view showing an eyelet plate in
perspective and the block body in fragmentary perspec
tive;
as shown in FIG. 3.
The assembling is carried out very simply and quickly
by slipping eyelet plates 25 into all cells 19 except the
end cells from the same side of ‘body 10 so that the plates
25 engage surfaces 14 and the eyelets 27 become located
in the lower portions 20‘ of the cells. In this position,
the pre-formed cars 26 at one end of the eyelet plate 25
extend into the adjacent notches 16 at one side of the
body Ill and the bent tips 29 engage the surfaces 17 of
said notches 16. The assembly with the ?xture is then
positioned so as to render the straight cars 26 at the
other side ‘of body 10 accessible to a suitable crimping
FIG. 4 is a sectional plan view taken along line 4—4 70 tool which is applied to these ears to crimp them into'the
of FIG. 2 in the direction of the arrows;
adjoining notches 16 against the surfaces 17 thereof with
FIG. 5 is a sectional transverse elevation, on an en
the ears extending along and engaging the parts of end
3,056,103
it
cells each extending laterally through said body from
faces 15 which extend between surfaces 14 and 17. The
assembly is now complete. Since the surfaces 14 and
17 are directed away from each other, the eyelet plates
one side to the opposite side thereof and each cell having
between its ends an elongated portion of T-shaped cross
section terminating short of said ends in end surfaces
each of which is formed with a notch, in combination
with a plurality of electrically conducting plates secured
25 are securely ?xed to the body 18, the ears or exten
sions 26 of the plates 25 forming a means which ?xes
the eyelet plates to the body 10, which is located only at
within said cells, said plates having deformably opposed
the exterior of the body 10, ‘and which engages only
end portions sized to be received within said notches to
exterior surfaces thereof.
hold said plates within said cells, said top wall being
The manner in which spade lugs 30 are connected to
the eyelet plates is apparent from FIG. 5. A screw driver 10 formed with a pair of openings aligned with the lower
narrower portion of each cell to provide access to said
extending through an opening 22 can cooperate with
plates.
the head 31 of a screw 28 to turn the latter, and the open
ings 22 are larger than heads 31 so that they can turn
2. A terminal block as recited in claim 1 and wherein
said bottom wall, at the end cells of said row, is formed
freely in openings 22. When a solder lug 30 is slipped
beneath head 31 of a screw 28, the latter can be tightened 15 with terminal block mounting openings which are aligned
down onto the lug. Since the entire length of the eye
lets 27 are available for carrying screws 28‘, the eyelets
27 can be relatively short.
To accommodate stripped wire ends 32 (FIG. 6), a
pressure plate ‘33 may be placed between eyelet plate 20
25 and screw heads 31 with the screw shanks extending
with said top wall opening, ‘and wherein each end cell
has, at the junction between said upper and lower por
tions, a pair of supporting surfaces directed toward said
top wall, and a pair of mounting plates in said end cells
substantially as wide as said upper portions thereof on
said supporting surfaces thereof bridging said narrow cell
freely through openings of pressure plate 33. This plate
has serrated surface portions 34 directed toward plate
portions and formed with openings respectively aligned
of eyelet plates 25.
Plates 40, identical with eyelet plates 25, except that
mounting member.
with the top wall openings over said end cells, so that
screws accessible through said top wall openings can ex
25 and engaging wire 32. The screws of FIG. 6 can be
turned down with a force sufficient to ?atten wire 32 into 25 tend through said plate and bottom wall openings into
a mounting member and press said plates onto said sup
an elliptical cross section to provide a relatively large
porting surfaces of said end cells to ?x said body to said
area of contact. Plates 33 have ‘a width equal to that
3. A terminal block as recited in claim 1 and wherein
they have no eyelet portions, are provided to fortify the 30 each cell has at the junction between its lower and upper
portions a pair of support surfaces directed toward said
end mounting portions of the terminal blocks. These
top wall, said plates having a width substantially equal to
plates 40 are shown in FIGS. 1, 2 and 4, and for con
the width of said upper cell portions, said plates resting
venience are illustrated only at the right-hand end of each
on said support surfaces, bridging the lower cell portions,
view, it being understood, however, that in practice ‘a
' and having ears extending respectively into said notches,
plate is employed at each end of the terminal block.
said eyelet plates being formed with a pair of threaded
Each plate 40 has at each end a pair of bendable ears
openings in line with said top wall opening.
42, and intermediate its ends a pair of mounting holes
41. The plates 40 are placed in the end cells 19 on sur
4. A terminal block to secure a lead to a terminal
faces 14 thereof straddling the lower portions 20 of the
cells with the mounting holes 41 in registry with the bot
screw comprising a non-conductive elongated body and
tom wall openings 24, and the ears 42 are bent into
the notches 16, as previously described, to secure the
with a bottom wall, a top wall and a plurality of dividing
walls transverse thereto which de?ne a plurality of elon
gated cells transverse to said block, each of said cells
a plurality of conductive plates, said body being formed
plates 40 in mounted position. When the terminal block
including a pair of upwardly facing supporting surfaces
is to be mounted, mounting screws are passed through
the plate mounting holes 41 and the aligned mounting 45 within said body and within the con?nes of said cells.
securement notches formed at opposite ends of each of
holes 24» of the block body. These mounting screws do
said cells having downwardly facing securement surfaces,
not directly engage body 10 and instead press the plates
said plates being substantially of the width of said cells
40 against the relatively large areas of ‘surfaces 14 so
and of a length less than the length of said cells and having
that a considerable force can be applied without unduly
stressing the body 10.
50 ears extending therefrom adapted to be engaged with
said securement notches to secure said plates to said
It will be noted that all exterior surfaces of body 10‘
block, said plates being formed with at least one threaded
‘are located outwardly beyond screws 28, eyelt plates 25,
hole, said terminal screws received therein, said top wall
and pressure plate 33 in the case of FIG. 6, and the
openings at the ends of cells 19 as Well as the openings
being formed with clearance openings aligned with said
22 are too small to allow a human ?nger to have access 55 threaded holes to provide access to said terminal screws on
to the electrically conductive elements. Also bottom wall
11 is entirely closed beneath eyelet plates 25, so that
there can be no arcing to the mounting plate. With the
structure of the invention there are no fasteners extend
ing into body 10 to crack the latter.
said securement plates, connection of said lead to said
terminal screws being made through the opened ends of
said cells.
5. A terminal block for securing a lead to a terminal
60 screw comprising a non-conductive elongated body and
The upper surface of top wall 18 can be embossed,
a plurality of conductive plates, said body being formed
printed or otherwise provided with lead-identifying indicia
which cannot be covered by the leads. This enables the
with a bottom wall, a top wall and a plurality of divid
ing walls transverse thereto which de?ne a plurality of
elongated cells transverse to said block, each of said
various terminals to be identi?ed and distinguished with
out the necessity for separate marking strips which are 65 cells including a pair of supporting walls located parallel
to and against said aforementioned dividing walls which
customarily used for this purpose.
provide supporting surfaces on their upper surfaces, said
While a preferred embodiment of the invention has
supporting walls terminating inwardly of the ends of
been shown and ‘described herein, it is obvious that nu
said cells at end faces which are formed with securement
merous omissions, changes and additions may be made
therein without departing from the spirit and scope of
the invention.
What I claim is:
1. A terminal block comprising an elongated elec
trically non-conductive body having top and bottom walls
notches, said plates being substantially of the width of
said cells and of the length of said supporting walls and
having ears extending from their ends adapted to be en
gaged with said supporting wall securement notches to
secure said plates to said block, said plates being formed
and formed between said walls with a row of ‘hollow 75 with at least one threaded hole, said terminal screw rc
5
3,056,103
6
ceived therein, said top wall being formed with clearance
openings aligned with said threaded holes to provide ac
said plate being formed ‘with ‘at least one threaded hole,
said terminal screw received therein, said top wall being
formed with at least one clearance opening aligned with
cess to said terminal screws on said securement plates,
connection being made from said lead to said terminal
screw through the open ends of said cells.
6. A terminal block according to claim 5 adapted to
be mounted :by a mounting screw onto a surface wherein
the end cells of said terminal block are formed with
securement openings in the bottom wall in alignment
with said clearance openings in said top wall and wherein
said plates located in said end cells are formed with screw
receiving holes of a diameter less than that of said top
J4,
said threaded hole to provide access to said terminal screw,
connection being made from said lead to said terminal
screw through the open ends of said cell.
8. A terminal block according to claim 7 adapted to
be mounted by mounting screws into a surface wherein
two end cells are formed within said block, securement
10 openings formed in the ‘bottom wall of said end cells in
alignment with said clearance openings in said top wall,
and wherein said plates located in said end cells are
wall clearance holes and adapted to receive said mounting
formed with screw receiving holes of a diameter less
screw to mount said block onto said mounting surface.
than that of said top wall clearance holes and adapted to
7. A terminal block for securing a lead to a terminal 15 receive said mounting screws to mount said block on said
screw comprising a non-conductive terminal block body
mounting ‘surfaces.
and a conductive plate, said ‘body being formed with a
bottom wall, a top wall, and at least two dividing walls
References Cited in the ?le of this patent
transverse thereto which de?ne an elongated cell trans
UNITED STATES PATENTS
verse to said terminal block body, said cell including a
pair of supporting walls located parallel to ‘and adjacent
said aforementioned dividing walls and providing up
wardly facing supporting surfaces, said supporting walls
terminating inwardly of the ends of said cell at end faces,
at least one securement notch formed in each end of 25
said cell within said end faces, said conductive plate
being substantially of the width of said cell and of the
length of said supporting walls and having at least one
ear formed at either end adapted to be engaged within
said securement notches to secure said plate to said block,
2,189,622
2,221,710
2,463,826
Barnsteiner ___________ __ Feb. 6, 1940
Johnson _____________ __ Nov. 12, 1940
Thacker _____________ __ Mar. 8, 1949
2,679,634
2,693,586
2,724,811
Rawley _____________ __ May 25, 1954
Dorfman et al. ________ __ Nov. 2, 1954
Poupitch _____________ __ Nov. 22, 1955
661,389
823,154
Germany ____________ __ June 17, 1938
Germany _____________ __ Dec. 3, 1951
FOREIGN PATENTS
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