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Publication numberUS1902731 A
Publication typeGrant
Publication dateMar 21, 1933
Filing dateNov 15, 1930
Priority dateNov 15, 1930
Publication numberUS 1902731 A, US 1902731A, US-A-1902731, US1902731 A, US1902731A
InventorsWarren S Sherman
Original AssigneeWarren S Sherman
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Locking cover
US 1902731 A
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Description  (OCR text may contain errors)

March 21, 1933. w. s. SHERMAN- LOCKING COVER Filed Nov. 15, 1930 2 Sheets-Sheet 1 FIG. 2.

f INVENTOR. Warren S. Sherman BY I I ATTORN EYS.

- March 21,1933. WSSHERMAN 1,902,731-

LOCKING COVER Filed Nov. 15, 1930 2 Sheets-Sheet 2 FIG. 3. A


Patented Mar. 21, 1933 WARREN s. SHERMAN,1QF'OKLAHOMA. CITY, OKLAHOMA LOCKING covnn Application filed November "15, 1930; Serial i No. 496,008ll This. inventionrelates toimprovements in locks particularly'well adaptedfor the lock ing of heavy covers, such as man-hole, meter box and valve covers,,and-has particular 5 reference to such type of coversas shown in my Patents #1,553,639 and $1,580,541; embodying more practical improvements and features of lock construction thereover. A further and important object of this ."invention :is the provision of a counter weight operated locking bolt structure for man-hole covers .andzt'he likehaving an improved preferably detachable. key-handle.

associated. therewith;

Other objectsand advantages of this invention will be? apparent -during the course i of thefollowing detailed description.

In the accompanying drawings,1- forming responding parts" throughout the several views,

Figure 1 is a sectional'view taken diametricallythrough a cover and itss'upporting .1 frame showing the cover in slightly elevated relation to the frame, and the facility with which it is removed and held-by the keyhandle structure holding the bolt unlatched. Figure 2 is a bottom plan view of the cover upon its frame, "with the bolt held by the' ke'yin unlatched position readyfor detachment of "the cover.

Figure 8 is a diametrical cross sectional. view showing the: coverlooked upon: its


Figure *4: is 'a bottomplan View of. the locking'mecha'nism, showing-the relation of the key to'the cover and bolt at a time durdotted lines the relation inwhich the handle is positioned when inserted with the bolt 50, retracted.

Figure 7 is a bottom planaview showing pose of illustration is shown .onIy a pre' ferred embodiment of- 'thel invention, the

a part of this specificatiomwand wherein slmilar reference characters designate cor-x cular reinforcing ribs 10 if ..desired..f The new the keymay be used to ush the bolt into locking ,or :latching-position-in event the counterweight-is insufiicient' to overcomethe resistance of the bolt to movement 5 1n lts supportsl V Figure 8 is .a fragmentary. side elevation of the lower. portion ;;of the bit end of -the' keyu V Inflthe drawings, @wherein for. the purletter A may designate a cover of the :man hole type, for,detachableisupport upon "a frame B; improved. latch. and. locking mechanism C being-provided to prevent accidental w detachment. or unauthorized detachment" of the. cover from the frame. 1

.An improved.- shandle-key Dy is provided both to serve as .a keyinuunlatching ,the bolt and a handle'inrlifting the cover-IA.

The cover A is of the .cast metal circular disc type, having the upper surface, thereof suitably provided with outer and.inner;cir-

under surface of the'body of the cover A has reinforcement .thereon'inthe nature of a main rib 11 extending substantially. en-o tirely across the entire width. ofrthe' cover,-

diametrically, This. rib? increases: in depth I from the ends towards the centralwportion, as shown in Figure 3 and elsewhere. Lat: erally extending right angled reinforcing.- ribs 12' are provided in'opposed .pairsnear the ends of the main rib 11. .The :body; of the cover A is peripherally beveled ats14, that is, COIIVGIgGDtlYZfIOID' the topsurface to the bottom surface;

The frame B includes the bodywcasing 16, I which may be. of any nature," dependent en-. tirely upon the use to which the improved. cover loekconstruction sis applied. The frame additionally includes the. annular: top. wall 18 whichat the inner margin thereof 7 is flanged downwardly and inwardly'to provide a peripheral retainingseatQO. for receiving the cover A in such 'mannenthat the top surface of the latter may lie substantially flush-with'the top surface of the wall 18. This flange 20-has a beveled surface facing the opening inwhich. the cover rests,

for receiving the bevel edge 14 of the cover A, as is shown in Figure 3 of the drawings.

The' under surface of the body of the cover is provided with an L-shaped retaining lug near an outer margin thereof, de-

fining an outwardly facing recess which receives a portion of the horizontal seat flange 20 therein, as shown in Figure 3, with the lower end of the lug 25 resting beneath the flange 20, to prevent an accidental upward movement of the cover, at this location, from the flange 20. I The improved latch C is adapted to operate at a diametrically opposed location on the bottom of the cover A with respect to the retaining lug 25, as will be subsequently mentioned.

The latching mechanism C preferably includes an elongated slidable bolt 30, having its inner end of an inverted lU-shape, as shown in Figure 3 of the drawings at 31, providing a downwardly facing socket or opening 32. The bolt at its outer end is beveled at 33, and said outer end is slidable within an opening 34 of a depending bearing'lug 35 which is formed integral with the cover A, as shown in Figure 1 of the drawings; the opening 34 beingpositioned so that the outer end of the bolt 30 may slide to a retainingposition beneath the flange 20 of the frame B, at a location diametrically opposed from the retaining lug 25, in order to hold the cover A in a locked' position upon the top wall 18 of the frame B.

Means is provided to normally urge and move the bolt 30 to a looking or latching position. This means preferably comprises a bell crank lever affair, including a weighted arm 38, the outer end of which is provided with a weight 40. A second arm 41 is integral with and normal to the arm 38. The weighted lever at the juncture of its arms 38 and 41 is pivoted at 44 between two depending lugs or flanges 45 and 46, which are integral with the cover A and are integral with and connected to the midway portion of the rib 11. The inner end of the bolt 30 slides and is retained between the flanges45 and 46, and the arm portion 41 operates in the downwardly facing opening 32 ofthe bolt 30; the weighted end 40 of the lever lying beneath the bolt 30 and obviously acting to urge the outer end of the bolt 30 into a latching or locking position. The maximum position of extension to which the weighted lever may move the bolt 30 is determined by abutment of a right angled stop lug 48 against the inner side ofthe bearing lug 35, as is shown in'Figure 3 of the drawings while the maximum position of retraction may be determined by the abutment of the weight 40 of the lever, with the under surface of the bolt 30. r

The key-handle member D: preferably includes a shank portion 50, to the lower end of which the bit 51 is connected. The bit is integral with the bottom of the cover A, for purposes to be subsequently described.

51, as is shown in Figures 4, 7, and 2 of the drawings,includes the inner portion connected directly to the stem or shank 50,. designated at 52, which is truly radial to the stem 50, and which has connected at the outer longitudinal edge thereof a bit portion 53 at an obtuse angle with respect to the plane of the portion 52. The portion 53 extends upwardly above the top edge of the portion 52, to define a recess 54 between the stem and the facing edge of'the bit portion 53, as shown in Figure 8, which receives depending retaining flanges and 61 which r so The stem of the shank 50 about midway of its ends is provided with a downwardly facing shoulder 57 adapted to limit the maxi-' .mum inserted movement of the key in the keyh0le'58 of the cover. At its upper end the shank of the key is provided with a handle 59 which may be of the T-shaped t e. The keyhole slot 58 is disposed in the cover to one side of-the bolt 30, preferably adjacent an end of the bearing lug 35. It comprises a stem receiving portion which re,- ceives the lower end of the stem or shank. 50 of the'key, and an elongated slot extending therefrom which is tangential rather than radial to the stem receiving and larger portion of the keyhole slot 58. On the under surface of the cover A there is provided a depending flange 60 surrounding the keyhole slot 58, and immediately at the end of the slot 58 where the stem of the key is received there is provided a depending re-. duced retaining flange 61 of segmental formation, which fits in the recess of the key D I r when the latter is drawn upwardly to serve as a handle for lifting the cover, and thus preventing accidental detachment of the parts after retraction of the bolt.

As is shown in Figure 3 of the drawings, the bell crank lever type of weight urges the 119 bolt 30 into a locking and latching position beneath the frame whereon thecover A is received. If it is desired to remove the cover the key D is inserted at its bit end into the slot 58, and the key is turned to the position shown in Figure 2, which moves the portion 53 of the bit against the laterally extending lug 65 which is fixed with the bolt 30, as shown in Figure 2, and

thus the bolt is retracted until the weight 1 20 cidental slipping of the key in its key slot, and in this position the handle is located, as shown in dotted lines in Figure 2, in the most desirable location for suspending and holding the weight of the cover.

Should the bolt 30 become stuck so that the actuating weight cannot move it to latching position, the bit 51 of the key is so shaped that the key may be turned in an opposite direction from the bolt unlatching direction, as shown in Figure 7, so that the rear surface of the bit'portion 50 will ride against the inner surface of the bolt lug 65, and upon further turning of the key in the direction shown by the arrows in Figure 7 it is obvious that the bit will have a cam-like engagement against the lug for urging the bolt to a looking or latching position.

When the key K is serving as a handle for supporting the cover, as shown in Figure 5, it is to be noted that the recess 54 is of suflicient depth that the upper end of the bit portion 53 lies in the way of the annular flange 6O surrounding the keyhole slot 58, so that there will be no possibility of turning of the key to a position where the bit will align with the slot 58. This locking relation is designated at in Figure 5 of the drawings.

The cover A is provided with centering lugs 7 5 arranged substantially equi-distant at opposite sides of the bolt 30, which cooperate with the retaining lug 25 in centering and preventing displacement of the cover from its frame.

Various changes in the shape, size, and arrangement of parts may be made to the form of invention herein shown and described, without departing from the spirit of the invention or the scope of the claims.

I claim:

1. In a cover lock, the combination of a cover having an elongated keyhole and a depending flange about said keyhole, said flange having an outer face substantially perpendicular to the cover throughout the length of said flange, and a locking bolt carried by said cover, said locking bolt including a portion engageable with a key for retracting said bolt, whereby said flange provides a substantially perpendicular stop for the bit of a key to prevent unintentional removal of said key, the bit of said key being provided with a recess allowing insertion, operation and partial retraction of the key so as to receive said flange in said recess and thus stop said key from removal by abutment of its bit against said substantially perpendicular flange.

2. In a cover lock, the combination of a cover having an elongated keyhole, said cover also having a wall, associated with said keyhole, upon the under side of said cover, said wall having a substantially perpendicular face substantially equal in length to the length of a key bit, and a locking bolt carried by said cover,'said locking bolt including a portion engageable with a key for retracting said bolt, whereby said wall provides a substantially perpendicular stop

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2594012 *Mar 13, 1950Apr 22, 1952Griffin George GMeter box and cover therefor
US2693100 *Jun 6, 1950Nov 2, 1954Wiegel Charles BSafety manhole cover lock
US6073792 *Jul 27, 1998Jun 13, 2000Campbell; LuckyAccess cap
US6811119 *Jul 2, 2003Nov 2, 2004Dabico, Inc.Aircraft service pit latch
US8156773 *Jun 12, 2009Apr 17, 2012Olson Rodney GManhole cover locks
DE2535455A1 *Aug 8, 1975Feb 10, 1977Riegraf Kg GSchloss, insbesondere fuer sparkassetten
EP1327720A1 *Oct 30, 2002Jul 16, 2003Kessel GmbHAccess cover
U.S. Classification70/169, 70/154, 220/210, 292/187, 70/DIG.340, 220/327
International ClassificationE02D29/14
Cooperative ClassificationE02D29/1427, Y10S70/34
European ClassificationE02D29/14D