U.S. patent number 3,713,200 [Application Number 05/155,890] was granted by the patent office on 1973-01-30 for combination knockout tool.
Invention is credited to Fred R. Burns.
United States Patent |
3,713,200 |
Burns |
January 30, 1973 |
COMBINATION KNOCKOUT TOOL
Abstract
A combined tool for removing knockouts and mounting rings
therefor from electrical fittings or outlet boxes to provide
suitable apertures therein to receive the wires and to enable
suitable conduits for the electrical wiring to be connected
thereto. The tool has a knockout engaging tip having a slot therein
for engaging a deflected and partially released knockout to assist
in removing the same to provide a conduit receiving aperture. If
the aperture produced by the knockout is too small, it can be
enlarged by removing the knockout mounting ring secured to the wall
by frangible connections. To do this the tool is provided with
wings adjacent said tip which are provided with side opening slots
adapted to be positioned over the ring, after the knockout has been
removed, and the tool manipulated with a rocking motion to remove
the ring. The tool thus provides a means for easily and quickly
producing conduit receiving apertures.
Inventors: |
Burns; Fred R. (Trumbull,
CT) |
Family
ID: |
22557187 |
Appl.
No.: |
05/155,890 |
Filed: |
June 23, 1971 |
Current U.S.
Class: |
29/267; 225/103;
81/3.55; 254/131 |
Current CPC
Class: |
H05K
13/0007 (20130101); Y10T 29/53896 (20150115); Y10T
225/371 (20150401) |
Current International
Class: |
H05K
13/00 (20060101); B23p 019/04 () |
Field of
Search: |
;81/3.34,3.46R,3.46A,3.1R ;7/17 ;29/267,278,275 ;254/131 ;225/103
;145/5A |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Custer, Jr.; Granville Y.
Assistant Examiner: Parker; Roscoe V.
Claims
I claim:
1. A combined tool for removing knockouts from electrical fittings
and outlet boxes comprising a shank having a handle at one end and
a knockout engaging tip at the other end adapted to engage and
deflect a knockout and partially release the knockout in response
to a blow applied to said tool, said knockout engaging tip having a
slot extending inwardly from the end thereof adapted to receive and
manipulate said partially released knockout to remove the same,
side wings on the shank adjacent said knockout engaging tip
provided on opposite edges with aligned slots to receive a knockout
supporting ring releasably connected to said outlet box when said
tip is inserted through the opening formed by the removed
knockout.
2. The invention as defined in claim 1 wherein one of said slots is
a long slot to enable the tool to be moved into engagement with
said ring.
3. The invention as defined in claim 1 wherein one of said slots is
short and of a predetermined length so that said tool when in
position engages only said ring whereby manipulation of said tool
removes said ring from the outlet box.
Description
Heretofore, knockouts, which are usually round, are secured in the
wall of an electrical fitting or outlet box by a single frangible
connector. These are usually removed by means of a punch or the
like which is applied thereto and struck with an implement. The
first blow usually partially deflects the knockout out of the plane
of the wall. It subsequently requires additional blows or
additional equipment to completely release the knockout to provide
the required opening. Should it be desired to enlarge the aperture,
it is necessary to apply blows to the mounting ring to break the
two frangible connections to the wall to remove said ring. These
operations are time consuming and sometimes very difficult.
The present invention provides a single combination tool for simply
and quickly removing knockouts or mounting rings therefor to
provide the required apertures in the electrical fitting or outlet
box by which conduits are connected thereto.
This is accomplished by the combined tool of the present invention
which has an elongate shank provided with a handle at one end and a
tool head at the other end. The tool head of the present invention
has a knockout engaging tip capable of delivering a blow to a
knockout to partially deflect the same. The tip has a slot in the
end thereof adapted to be inserted over the deflected knockout to,
upon manipulation of the tool, cause the removal thereof. Also, the
combined tool has lateral wings adjacent the tip, said wings having
aligned side opening slots for receiving the mounting ring when the
tip is inserted in the hole made by the removal of the knockout and
by manipulation of the tool to quickly release the mounting ring
from the electrical fitting to enlarge the opening therein.
The present tool can be easily manufactured and is simple to
operate to provide the required conduit connecting openings in the
electrical fitting or outlet box.
Other features and advantages of the invention will be apparent
from the specification and claims when considered in connection
with the accompanying drawings in which:
FIG. 1 is a front view of the combined tool.
FIG. 2 is a side view of FIG. 1 (partially broken away).
FIG. 3 is an end view of FIG. 1.
FIG. 4 is a fragmentary view of the wall of an electrical fitting
or outlet box.
FIG. 5 is a sectional view of a knockout being partially
deflected.
FIG. 6 is a sectional view of the tool being manipulated to remove
the partially deflected knockout.
FIG. 7 is a sectional view of the tool being inserted to remove the
mounting ring.
FIG. 8 is a sectional view of the tool in ring-engaging
position.
FIG. 9 is a plan view of FIG. 8.
FIG. 10 is a sectional view showing the manipulation of the tool to
remove the ring.
As shown in the drawings, the combined tool is for removing
knockouts from the wall 10 of electrical fittings or outlet boxes,
such as shown in FIG. 4. As illustrated, the knockout 11 is
circular and is connected by a single frangible connection 12 to
the knockout supporting or mounting ring 13 which in turn is
connected to the wall by the two frangible connections 14.
The tool of the present invention comprises an elongate shank 20
having a handle 21 at one end and a knockout removing tool head 22
at the other end. The tool head, as shown in FIGS. 1-3, comprises a
tip or punch 23 at the end thereof. While this tip can have various
shapes as required, it is herein illustrated as being formed by the
tapered surfaces 24 to provide an end surface 25 to deliver the
desired force to the knockout 11 when applied thereto and the
handle 21 struck a predetermined blow in the direction of the arrow
A in FIG. 5. This causes the knockout to be partially deflected as
shown in FIG. 5. To readily remove the knockout, the tip is
provided with a slot 26 extending inwardly thereof. The slot 26 is
inserted over the edge of the partially deflected knockout, as
shown in FIG. 6, and the tool manipulated in the direction of the
arrow B which quickly breaks the frangible connection 12 and
releases the knockout to provide the aperture by which the usual
conduits or BX (not shown) can be attached to the fitting or outlet
box.
Should it be desired to enlarge the conduit-receiving aperture, the
tool of the present invention can be readily employed to remove the
mounting ring 13. To accomplish this the tool head 22 has laterally
extending wings 30, 31 adjacent the tip as shown in FIG. 1. The
wings have aligned slots 32, 33 extending inwardly from the side
edges. As shown, slot 33 is longer than slot 32. The longer slot
permits the tool head to be inserted through the knockout aperture
and moved in the direction of the arrow C until the edge of the
wing 30 can pass into the opening. The tool head is thereafter
moved to the position of FIG. 8 wherein the slot 32 engages the
ring and locates the tool head in interlocked relation only with
the ring as illustrated in FIGS. 8 and 9. The tool is rocked in the
direction of the arrow D of FIG. 10 and readily breaks the
frangible connections 14, thus releasing the ring 13 from the
fitting or outlet box and provides an opening to which a larger
size conduit can be connected.
Thus it will be seen that the combined tool for removing knockouts
from electrical fittings or outlet boxes can readily produce the
desired opening therein such as for connecting conduits
thereto.
The combined tool of the present invention, which is of a simple
construction, can be easily and inexpensively manufactured and can
be employed to quickly and readily remove knockouts as
required.
Variations and modifications may be made within the scope of the
claims and portions of the improvements may be used without
others.
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