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Publication numberUS2283371 A
Publication typeGrant
Publication dateMay 19, 1942
Filing dateMay 22, 1940
Priority dateMay 22, 1940
Publication numberUS 2283371 A, US 2283371A, US-A-2283371, US2283371 A, US2283371A
InventorsJohnson Corydon M
Original AssigneeJohnson Corydon M
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Latch for handhole covers
US 2283371 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

y 1942- c. M. JOHNSON 2,283,371

LATCH FOR HAND HOLE COVERS Filgi May 22, 1940 INVENTOR Corydon M. Johnson BY z 0 TI/10 ATTORNEYS Patented May 19, 1942 UNITED STATES PATENT ()FFIQE LATCH FOR HANDHOLE COVERS Corydon M. Johnson, Freeport, N. Y; Application May 22, 1940, Serial N 0. 336,523

3 Claims.

This invention relates to a latch for hand hole cover. In many constructions it is necessary to provide hand holes through which access may be had to operating or other mechanism.

For instance in aeroplane construction hand holes are provided in the fuselage through which access may be had to the operating parts for the purpose of inspection of repair work.

The present invention relates to a cover for such a hand hole, and the object of the invention is to provide a cover which may be easily placed and removed, and yet which will positively be secured in place against accidental displacement.

In the drawing:

Figure 1 is an elevation of such a cover looking at the outside thereof;

Figure 2 is a similar view looking at the opposite or inside;

Figure 3 is a sectional view showing the device in its locked position in full lines and in its unlocked position in construction lines, and also showing me operating tool that is used in connection therewith; and

Figure 4 is an enlarged sectional View of the spreader cam for the locking fingers.

The form of the invention disclosed in the drawing includes a frame I that is adapted to be attached by any suitable means to the element in which the hand hole occurs. This frame may be annular or of other desired form, and includes cam seats 3. These cam seats may be in the form of a continuous ring or, if desired, they may be only relatively narrow seats which occur opposite the cams which will later be described.

The cover element 4, which is of a configuration such as will close the hand hole, and which is either adapted to overlap the frame I, as illustrated in the drawing, or be flush with the outer face thereof and find its support on the cam seats 3, may be locked in place by the following mechanism: a rotatable post 5 having a socket 6 in the outer end thereof for the receptionof an operating tool '1 carries a helical cam groove 8 which has at its end a locking depression 9. This cam groove 8 is formed in a collar attached to the sleeve II by means of a rivet I0.

This post 5 is mounted for rotation in the sleeve I I that is slidingly supported by braces I2 on the cover 4. A cam pin I3 extends rigidly from the post 5 and is adapted to lie in the cam slot 8 and to seat in the depression 9 at the outer end thereof.

Resilient locking fingers I4 are secured at I 5 to a flange IS on the sleeve I I and extend generally speaking radially therefrom. The ends of these locking fingers are cam shaped as at H and are normally supported when the cover 4 is in an unlocked position upon tracks I 8. These tracks may be, as shown in the drawing, formed integrally with the braces I2 and secured'tothe cover by rivets or other means IS. The tracks I8 and the braces I2 may be made of one continuous circular piece of metal and simply stamped out into this shape, or they may be cut away in between the tracks I8 on which the locking fingers I4 ride.

A sealing gasket 2!! of resilient material surrounds the upturned ends M of the tracks It on the upturned flange of these tracks if they are formed of one continuous piece ofmetal, and because of the fact that the diameter of this annular gasket is normally greater than that of the upturned end 2| of the tracks, the latter will hold the gasket in place between themselves and the inner face of the cover 4 so that when the cover is drawn tightly toward the frame I the gasket will seal the joint between the frame and the cover.

In operation the locking fingers I 4 are in the construction line positions illustrated in Figure 3 when the cover is unlocked. When it is desired to lock the cover the tool I is inserted in the operating socket 6 and rotated. The rotation of this tool will rotate the post 5 and because of the engagement of the cam pin I3 with the slot 8 therein will draw the sleeve II and the cover 4 relatively toward each other. As they will thus draw together, the cams I! on the ends of the locking fingers Will ride outwardly against the resiliency of said fingers until they engage the edge of the cam seats 3. tive movement of the sleeve II and the cover 4 toward each other will cause the cam portion I! to ride up on the cam seats 3 with the result that the cover t will be drawn tightly against the gasket 20 and the hand hole covered and sealed.

When the cover reaches its final position, the

cam pin I3 will seat in the depression 9 in the post 5, and thus will lock the cover tightly against the frame I and the intervening gasket 20, because it will be forcibly held in said depression by the resiliency of the locking fingers I4.

When the tool is operated in the'opposite direction the pressure on the cams I? on the ends of the locking fingers will be released because the sleeve I I and the cover 4 will be moved relatively away from each other.

After the pressure is relieved the resiliency of the locking fingers will draw them inwardly on the tracks I8 to such an extent that they will lie within the circumferential dimensions of the The continued relacam seats 3 to permit the removal of the cover and the operating mechanism described through the hand opening in the frame I.

Thus it may be seen that the cover may be easily and quickly placed and locked in position. It may also be easily and quickly unlocked and removed, and in its covering position will present a smooth outer surface.

While I have described this embodiment of the invention as applied to a hand hole cover, it is of course to be understood that it is just as applicable to other devices which include a frame with an opening therethrough which it is desired to close, and therefore I do not wish to be limited to the particular use of the device as I have described it, nor do I wish to be limited to the particular construction disclosed because more variations may be made within the definition of the claims.

What I claim is: t

1. A latch construction for latching a cover to an angular frame having an inturned flange, comprising a post carried by and rotatable in the cover, a sleeve mounted on said post and slidable in relation thereto, means connecting the sleeve and the post together whereby when the post is rotated the sleeve will receive a sliding motion, resilient fingers carried by the sleeve and adapted to engage the inturned flange of the frame whereby when the sleeve is moved in one direction the fingers will be forcibly engaged with the flange and when the sleeve is moved in the other direction the fingers will be disengaged from the flange. 7

2. A latch construction for latching a cover to an angular frame having an inturned flange, comprising a post carried by and rotatable in the cover, a sleeve mounted on said post and slidable in relation thereto, means connecting the sleeve and the post together whereby when the post is rotated the sleeve will receive a sliding motion, resilient fingers carried by the sleeve and adapted to engage the inturned flange of the frame whereby when the sleeve is moved in one direction the fingers will be forciblyengaged with the flange and when the sleeve is moved in the other direction the fingers will be disengaged from the flange, and means for guiding the fingers into and out of engagement with the flange.

3. A latch construction for latching a cover to an angular frame having an inturned flange, comprising a post carried by and rotatable in the cover, a sleeve mounted on said post and slidable in relation thereto, means connecting'the sleeve and the post together whereby when the post is rotated the sleeve will receive a sliding motion, resilient fingers carried by the sleeve and adapted to engage the inturned flange of the frame whereby when the sleeve is moved in one direction the fingers will be forcibly engaged with the flange and when the sleeve is moved in the other direction the fingers will be disengaged from the flange, means for guiding the fingers into and out of engagement with the flange, and meansrigid with the last-mentioned means for guiding the sleeve in its movement.

CORYDON M. JOHNSON.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2735571 *Dec 31, 1952Feb 21, 1956 lockwood
US2735572 *May 18, 1953Feb 21, 1956The Steel Products Engineering CompanyFiller cap assembly
US2879725 *Feb 19, 1957Mar 31, 1959Audley V ZuverBurglar proof safe
US2935360 *Mar 30, 1956May 3, 1960Albert Lyon GeorgeWheel cover
US4964659 *Dec 11, 1989Oct 23, 1990Baldwin William CDiaphragm latch mechanism
US5007504 *Apr 10, 1990Apr 16, 1991Cincinnati Milacron Inc.Lubrication apparatus and method
US6487882 *Feb 9, 1999Dec 3, 2002Knox CompanyLocking cap system
US6553795Aug 30, 2000Apr 29, 2003Knox CompanyLocking cover plate arrangement
US6694783Dec 2, 2002Feb 24, 2004Knox CompanyLocking cover plate arrangement
US6698261Oct 17, 2002Mar 2, 2004Knox CompanyLocking cap system
US6907760Dec 23, 2003Jun 21, 2005Knox CompanyLocking cover plate arrangement
US7140212Jun 14, 2005Nov 28, 2006The Knox CompanyLocking cover plate arrangement
US7174753 *Jan 20, 2005Feb 13, 2007Centex CorporationMethod for protecting from unauthorized access one or more ports of a system integrated into a structure for injection of a material into one or more cavities in the structure
US7174754 *Jan 31, 2006Feb 13, 2007Centex CorporationKey for engaging a locking mechanism of a port cover for protecting from unauthorized access one or more ports of a system integrated into a structure for injection of a material into one or more cavities in the structure
US7404307 *Feb 13, 2007Jul 29, 2008Centex CorporationPort cover for a system integrated into a structure for injection of a material into one or more cavities in the structure
US7415855 *Oct 20, 2004Aug 26, 2008Centex CorporationMethod for protecting from unauthorized access one or more ports of a system integrated into a structure for injection of a material into one or more cavities in the structure
US7437901Feb 27, 2004Oct 21, 2008Knox CompanyLocking cap system
US7900490Aug 17, 2007Mar 8, 2011Hometeam Pest Defense, Inc.Method for engaging with a projection of a first component to removably secure a second component to the first component
US8683831Nov 28, 2006Apr 1, 2014The Knox CompanyLocking cover plate arrangement
US8991434Sep 13, 2007Mar 31, 2015The Knox CompanyLocking cap system
US9341299Sep 26, 2014May 17, 2016Knox Associates, Inc.Locking cap system
US20040134246 *Dec 23, 2003Jul 15, 2004Trempala Dohn J.Locking cover plate arrangement
US20040168488 *Feb 27, 2004Sep 2, 2004Trempala Dohn J.Locking cap system
US20050198806 *Oct 20, 2004Sep 15, 2005Gahlhoff Jeryl E.Jr.Port cover for a system integrated into a structure for injection of a material into one or more cavities in the structure
US20050210736 *Jan 20, 2005Sep 29, 2005Gahlhoff Jeryl E JrMethod for protecting from unauthorized access one or more ports of a system integrated into a structure for injection of a material into one or more cavities in the structure
US20050229660 *Jun 14, 2005Oct 20, 2005Trempala Dohn JLocking cover plate arrangement
US20060123860 *Jan 31, 2006Jun 15, 2006Centex CorporationKey for engaging a locking mechanism of a port cover for protecting from unauthorized access one or more ports of a system integrated into a structure for injection of a material into one or more cavities in the structure
US20070137268 *Feb 13, 2007Jun 21, 2007Centex Corporation, A Nevada CorporationPort cover for a system integrated into a structure for injection of a material into one or more cavities in the structure
US20080209963 *Sep 13, 2007Sep 4, 2008Trempala Dohn JLocking cap system
Classifications
U.S. Classification70/168, 220/243, 292/6
International ClassificationF22B37/22, F22B37/00
Cooperative ClassificationF22B37/223
European ClassificationF22B37/22B4