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Publication numberUS3713200 A
Publication typeGrant
Publication dateJan 30, 1973
Filing dateJun 23, 1971
Priority dateJun 23, 1971
Publication numberUS 3713200 A, US 3713200A, US-A-3713200, US3713200 A, US3713200A
InventorsBurns F
Original AssigneeBurns F
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Combination knockout tool
US 3713200 A
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.
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Description  (OCR text may contain errors)

United States Patent 1 Burns in 3,713,200 51 Jan. 30, 1973 154] COMBINATION KNOCKOUT TOOL [76] Inventor:

Trumbull, Conn. 06611 [22] Filed: June 23, 1971 [21] Appl. No.1 155,890

[52] U.S. C1 ..29/267, 225/103, 81/3.46 R, 254/131 [51] Int. Cl. ..B23p 19/04 [58] Field 01Search...8l/3.34, 3.46 R, 3.46 A, 3.1 R; 7/17; 29/267, 278, 275; 254/131; 225/103;

Primary Examiner-Granville Y. Custer, Jr. Assistant Examiner-Roscoe V. Parker Attorney-Johnson & Kline Fred R. Burns, 6763 Main Street,

571 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. 1f 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.

3 Claims, 10 Drawing Figures PATENTEDJAHO 1975 3,713,200

INVENTOR.

,7 r'ed 132520725 BY A COMBINATION KNOCKOUT TOOL 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 isaplan view ofFlG. 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.

Iclaim:

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 5 said tool when in position engages only said ring whereby manipulation of said tool removes said ring from the outlet box.

F t t i i

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US610423 *Jan 26, 1898Sep 6, 1898 Screw
US3579797 *Feb 20, 1968May 25, 1971Pepe Frank WTool for removing concentric knockouts
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3806970 *Apr 25, 1972Apr 30, 1974Spector GDrum wrench
US4034595 *Nov 19, 1975Jul 12, 1977Smith Glen RSheet metal working tool
US4132135 *Oct 14, 1977Jan 2, 1979Abbott LaboratoriesOpening device for tear open port of a container
US4167056 *Apr 27, 1978Sep 11, 1979Gte Sylvania Canada LimitedKnockout extracting tool
US4195760 *Mar 10, 1977Apr 1, 1980Technal International S.A.Apparatus for slotting metal shapes
US4210035 *Nov 9, 1978Jul 1, 1980White Carl ABoot buckling aid
US4509242 *Jun 10, 1983Apr 9, 1985Marra Gerardo JTool for quick removal of knock-out plugs
US4622868 *Apr 1, 1985Nov 18, 1986Flannigan Bryan WTool used to manually lock and unlock a passenger door of a motor vehicle
US4999899 *Oct 11, 1989Mar 19, 1991Lisle CorporationU-nut removal tool
US5212860 *Jun 5, 1992May 25, 1993Lakey Roger CTool for attaching fabric top to boat cockpit from inside the boat
US5535932 *Sep 30, 1994Jul 16, 1996Ruczienski; Erwin R.Method and apparatus for severing banding straps
US6269528 *Dec 15, 1997Aug 7, 2001Fairchild Holding Corp.Nut removal tool
US6415468 *Mar 26, 2001Jul 9, 2002William F. SpaurConcrete form snap tie tool
US6470548 *Dec 27, 2000Oct 29, 2002Hon Hai Precision Ind. Co., Ltd.Tool for mounting a clip to a socket
US8671543Dec 6, 2011Mar 18, 2014Roche Diagnostics Operations, Inc.Microneedle and method for the production thereof
US8695189 *Mar 20, 2012Apr 15, 2014Iscar, Ltd.Cutting tool key for mounting and extracting a cutting insert
US20100252601 *Apr 7, 2010Oct 7, 2010Richard ThibaultDrywall splitter
US20110010933 *Jul 20, 2009Jan 20, 2011Sam Van DuyneMulti-functional tool and method of using same
US20130167345 *Mar 20, 2012Jul 4, 2013Iscar, Ltd.Cutting Tool Key for Mounting and Extracting a Cutting Insert
US20140151426 *Dec 4, 2012Jun 5, 2014Richard ThibeaultDrywall splitter
US20150090079 *Oct 2, 2013Apr 2, 2015Anthony DelucciaKnot Untier
US20160151897 *Jun 10, 2015Jun 2, 2016Randy DaneliukTire Stud Removal Tool with Different Fulcrum Points for Use on Tires of Varying Tread Wear
USD666465Apr 6, 2012Sep 4, 2012J.A.O. Tool, Inc.Breakout tool
USD767350 *Nov 27, 2013Sep 27, 2016William J. BoberTool with curved blade
WO2017044813A1 *Sep 9, 2016Mar 16, 2017Hubbell IncorporatedConduit support bracket for electrical box
Classifications
U.S. Classification29/267, 254/131, 225/103, 81/3.55
International ClassificationH05K13/00
Cooperative ClassificationH05K13/0007
European ClassificationH05K13/00B