Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS1287290 A
Publication typeGrant
Publication dateDec 10, 1918
Filing dateMar 15, 1918
Priority dateMar 15, 1918
Publication numberUS 1287290 A, US 1287290A, US-A-1287290, US1287290 A, US1287290A
InventorsRobert Golden
Original AssigneeRobert Golden
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1287290 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)




1,287,290. Patented 1300.10, 1918.



. Specification of Letters Patent.

Patented Dec. 10, 1918.

I Application filed March 15, 1918. Serial No. 222,555.

T 0 all whom it may concern:

Be it known that I, ROBERT GOLDEN, a citizen 'of the United States of America, residing at Brooklyn, Kings county, State of New York, have invented certain new and useful Improvements in Manhole-Covers, of which the following is a full, clear, and exact description.

This invention relates to improvements incovers for manholes, coal-holes or'the like, the object being to provide a cover-for man or coal-holes that can quickly and securely be locked in position, the locking mechanism being operable exteriorly of the open ing covered, that is to say, the locking mechanism is arranged so thatit can be unlocked from above, or locked if necessary. Under ordinary conditions the cover will be self-locking, as will hereinafter appear. One of the advantages arising from my invention is that a man or coal-hole cover will be held against movement after it has been placed in position over an opening, that is to say, it cannot be tipped by being stepped on, nor can it be accidentally pushed away so as to leave an unprotected opening.

I will now proceed to describe my invention in detail, the novel features of which I will point out in the appended claims, reference being had to the accompanying drawing, forming part hereof, wherein Figure 1 is a sectional view of my invention;

Fig. 2 is a plan view thereof on a reduced scale;

. Fig. 3 is an enlarged detail plan View of one of the elements of the locking mechanism;

Fig. 4 is a side view thereof; and

Fig. 5 is a perspective view of a form of key which I employ to manipulate the look.

In the drawing, the numeral 6 indicates the usual standard sidewalk man-hole frame to receive a cover 7, of my improved construction. The cover 7 in this instance consists of a circular disk 7 having ribs 8 provided with slots or openings 9 to slidably retain locking bolts 10 and 11 beveled at the ends, as indicated by 12. The inner end of each bolt 10 and 11 carries an angularly inclined slot 13 through which a pin 14 is passed. The inner end of each of said bolts is located in a slot 15 in a block or weight 16 arranged to be raised and lowered, said block being slidably positioned between the centrally located ribs 8. As can be seen in Fig. 4, the pins 14 are carried by the block or weight 16 and cross the slot 15.-; The block 16 is further provided with a recess 17 having in communication therewith a slot 18. for the insertion of the nibs 19 and 20 of a key 21. The key 21 is passed through a slot 22, in the cover}, when the block 16 is to be engaged thereby. As can be seen in Fig. 1, the bolts 10 and 11 engagev the frame 6, or rather the ends of the bolts pass under the frame, when said bolts are in lockedposition; hence the cover cannot be removed from the frame.

To unlock the cover, the key 21 will be passed through the opening. or slot 22 in the cover and pressed downwardly, causing the nibs 19 and 20 to pass through the slot 18, in the. top of the block 16, into the recess 17, after which the bolt will be given a quarter turn, causing it to assume the position indicated by dotted lines, Fig. 1. After the key has been thus positioned, it can be used to draw the block or weight 16 up wardly, thereby drawing the bolts in the direction of the arrows 23 and 24, Fig. 1, due to the arrangement and cooperation of the slots 13 and pins 14. After the cover has been removed, the key can be withdrawn by reversing the operation above described.

To apply the cover, it is but necessary to place it in position over the opening and stamp the foot On same. The force resulting from stamping or pressing downwardly on the cover will cause the bolts 10 and 11 to move inwardly in the direction of the arrows 23 and 24 until the ends of the bolts have cleared the frame 6, after which the weight of the block 16 will cause. the bolts to move into looking position. The weight of the block 16 will be suflicient to maintain the bolts 10 and 11 in locked position at all times, whether the cover is in position over an opening or removed therefrom. Hence, while a key is necessary to unlock the cover, it will be self-locking, due to the provision of the weight or block 16.

What I claim as my invention is:

1. In combination with a manhole cover having a slot for the passage of a key, a block slidably retained by said cover, said block being provided with a recess, alining with the slot in said cover, to receive a key, and a plurality of locking bolts adapted for operation by said key.

2. In a manhole cover, a disk, ribs carried thereby, a plurality of locking-bolts slidably retained by said ribs, a block slidably mounted centrally of said disk between adjacent ribs, means carried by the block cooperating with said bolts to actuate the latter, and means operable from the exterior of the cover to actuate the block.

3. In a device, as described, in combination, a manhole frame, a cover mounted thereupon, a pair of oppositely-disposed looking bolts, guides on said cover for supporting said bolts for horizontal movement, a block, a guide on said cover in Which said block moves vertically, said block engaging said bolts to simultaneously advance and retract them to cause them to move under and away from the manhole frame, and means rojectable into the cover and engageable with said block to actuate the latter.

4. In a device as described, in combination, a manhole frame, a cover engaging the same, a series of depending ribs on said cover, a block Weight guided vertically between two of said ribs, said ribs being formed with a series of horizontally-alining openings, a pair of locking bolts adapted to slide horizontally in said alining openings, the inner ends of said bolts projecting through the ribs guiding said block, said block resting upon said bolt, and cooperating means on said bolts and block adapted, 2;;

when said block is lifted, to move said bolts horizontally at the same time.

5. In a device as described, in combination, a manhole, a cover seated thereupon, a

pair of horizontally-movable locking bolts guided beneath said cover, a Weight block straddling the inner ends of said bolts, and

supported thereupon, the inner ends of said bolts being formed with oppositely-inclined slots, pins carried by said block passing through said slots, the free ends of said bolts being under the manhole frame When said pins are at the lower ends of said slots and means for actuating said block to move said pins to the upper ends or" said slots so Copies of this patent may be obtained for five cents each, by addressing the Gommissioner o! Patents,

Washington, D. G.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3772828 *Dec 2, 1971Nov 20, 1973Chahley W LtdManhole cover
US4523407 *Sep 23, 1983Jun 18, 1985Dorothy W. MillerHatch cover
US4902165 *Feb 19, 1988Feb 20, 1990Embree Lewis ALocking valve cover
US4964755 *Apr 18, 1989Oct 23, 1990Lew-Mor, Inc.Manhole cover lock apparatus
US5611640 *Aug 22, 1995Mar 18, 1997Bowman; Harold M.Method and apparatus for anchoring a utility grate cover
US5628152 *Aug 16, 1995May 13, 1997Bowman; Harold M.Adjustable manhole cover support with shield
US5697729 *Aug 21, 1995Dec 16, 1997Bowman; Harold M.Anchor for utility access hole support insert
US6007270 *May 12, 1997Dec 28, 1999Bowman; Harold M.Manhole frame assembly
US6367200 *Dec 22, 1998Apr 9, 2002The Boeing CompanyQuick release and fastening cover
US6584734 *Dec 11, 2000Jul 1, 2003Larry MihaliczLocking ground hole cover
US7201534 *Apr 18, 2005Apr 10, 2007H & M - Amh, Inc.Apparatus and method to secure manhole accessways
US7726902 *Sep 26, 2006Jun 1, 2010Brad BongiovanniLocking cover for wells and underground tanks
US7798742 *Apr 18, 2007Sep 21, 2010Mcgard, LlcSecurity key tool for manhole access opening security device
US7883290Apr 14, 2008Feb 8, 2011Brenda RossManhole security barrier
US7896574May 22, 2008Mar 1, 2011Mcgard LlcSelf-locking manhole cover
US8347670 *Feb 23, 2010Jan 8, 2013Zachary Daniel RixLockable utility box lid
US8656645 *Nov 7, 2012Feb 25, 2014Omni Containment Systems, LlcDuct access door
US8674830Dec 21, 2010Mar 18, 2014Mcgard LlcManhole security cover
US8813426Dec 3, 2013Aug 26, 2014Omni Containment Systems, LlcDuct access door
US8888400Oct 7, 2010Nov 18, 2014Mcgard LlcCorrosion-resistant self-locking manhole cover
US9115479Oct 16, 2014Aug 25, 2015Mcgard LlcCorrosion-resistant self-locking manhole cover
US9127431Jun 8, 2011Sep 8, 2015Mcgard LlcManhole security cover
US20050196239 *Apr 18, 2005Sep 8, 2005H & M - Amh. Inc.Apparatus and method to secure manhole accessways
US20110203334 *Aug 25, 2011Rix Zachary DLockable Utility Box Lid
WO2005111318A1 *May 12, 2005Nov 24, 2005Ahlmann Aco SeverinProtective rib
U.S. Classification49/35, 49/465
Cooperative ClassificationE01F13/085