US1102422A

US1102422A - Manhole-cover.

Info

Publication number: US1102422A
Application number: US75142413A
Authority: US
Inventors: John Mckeon
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-03-01
Filing date: 1913-03-01
Publication date: 1914-07-07
Anticipated expiration: 1931-07-07

Description

J. MQKEON.

MANHOLE COVER.

APPLICATION FILED mum, 191s.

I Patented July 7, 19M

llil I -view of the wrench for operating vamp --JOHN MOKEON, OF CHICAGO, ILLINOIS.

MANHOLE-COVER.

Specification of Letters Patent.

Patented July 7, 19141..

Application filed March 1, 1913. Serial No. 751,424.

To all whom it may concern:

Be it known that 1, JOHN MCKEON, a citizen of the United States, residing in the city of Chicago, county of Cook, and State of Illinois, have invented certain new an useful Improvements in Manhole- Covers, of which the following is a specification.

Man-hole covers generally consist of a base ring in the form of a casting that is embedded in various kinds of material and which is provided with a cover that lies flush with the top surfaces of the base and street or sidewalk in which the base is embedded. These man-hole covers are usually in exposed places and are subject to heavy traffic. It is therefore highly desirable to provide some form of locking means. etween the cover and the ring so as-to prevent the cover displaced. Furthermore, man-hole covers are used in largenumbei's and it is, therefore, highly important that they be produced most economically.

The primary object of my invention, therefore, be economically molded or cast and to form a cover provided with a locking mechanism so simple that the parts thereof may be all molded or cast and without the necessity of expensive machine work upon such castings to make the various parts accurate.

To these ends I have designed a structure that is simple and economical to manufacture and which will prevent the cover from being accidentally displaced.

In the accompanying drawin I have shown the preferred form of my evice and in which drawing- Figure 1 is a top plan pleteman-hole cover; Fig. 2 is a the line 22 of Fig. 1; Fig.- 3is a plan view of the cover; Fig. 4 is view of my comsection on bottom a detail the locking mechanism. Fig. 5 is a section on the line 5-5 of Fig. 1. 1

Referring now more-particularly to the drawing, he base or ring 5 is provided with an integral flange 6 and an annular shoulder 7 is formed ..on the inner side of the base upon which the cover is designed to rest. Stop blocks 8 are integrally formed with the base and project slightly above the upper surface of the shoulder 7 and beneath these stop blocks recesses 9 and- 9 are formed to receive the ends of the lockingbars-Which will be hereinafter described. The base is ed, the diameter of from becoming accidentally is to so form the base that it may 14 and'an opening blocks 21. The flange preferably annular in cross-section and it is to be noted that the entire structure is so designed that it mav be cast or molded very simply.

The cover tion of metal that is preferably cast or moldat its top. The cover is provided with an annular flange 11 vand integrally formed with thejc'over are a ening ribs 12 terminating at their inner ends 1n a guide box 13 which is formed with an opening 14, but the construction of the box is such that the width of the opening 14 is shorter than the width of the box. The box is divided into two guide-

ways

15 and 15" in which the

locking bars

16 and 16 slide. The box is provided with an open-' ing 17 at one end and an opening 18 at its other end through which the

locking bars

16 and 16 respectively, slide. A guide block 19 is formed integral on the under side of the cover and in line with the opening 20 is formed centrally of the cover and extends throughthe cover and guide block 19. The locking bars are guided at their outer ends by the'guides 21, which are formed withv suitable apertures .22 through which the

bars

16 and 16 slide.

- vThe locking bars are provided with suitable recesses 28 and 23 formed on one of the sides of each bar to receive the ends of a lever 24, said lever being provided with a hexagonal stem 25 which projects through the opening 20, but terminates short of the top surface of the cover. The opening 20 is sufficiently cut away on the top surface 'of the cover to provide clearance for the wrench 26. To prevent the locking bars from becoming accidentally displaced the pins 27 are secured thereto to prevent the locking bars from sliding through the 11 on the cover 10 is cut away at two points as shown at 28 so as to allow the flange 11 to rest upon the atthe same time the shoulshoulder 7 and ders 8 prevent the rotation of the cover relative to the base, since they extend into the cut away portions 28. I

It will be seen from the foregoing description that the base is of such a simple'construction that it may be easily cast or molded and that the cover with the integral box for receiving the locking bars may readily cast. The locking bars themselves,

10 consists of a disk-like secwhich is substantially the same as the internal diameter of the base plurality of strengthe also as well as the lever, are intended to be also cast and the parts are assembled as follows: The locking bars are slid through the guides 21 and through the end openings 17 and 18 into the guide-

ways

15 and 15 with therecesses 23 and 23 in the locking bars lying beneath the under surface of the box 13.

will be confined by the walls of the box and by securing pins '27 to each locking bar the outward movement of the locking bars is limited by the pins, thereby preventing the lever from being turned upon its pivot sufliciently far to again assume .a position parallel to the long axis of the guide block 19-. The locking bars may thereafter be ac-' tuated by a key such as shown in Fig. 4 engaging the nut end of the stem on the lever so as to move the outer edge of the i notches,

,-"site sides of the inner ends of said locking bars into the

recesses

9 and 9 and towithdraw the locking bars from said recesses for the purpose of locking and unlockingthe cover to the base.

Having now described my invention, I claim:

1. Ina man-hole cover structure, the combination with'a base forming a cover seat, a cover resting on said seat and having a .central opening therethrough, a box-like structure cast on the cover at the center thereof, lockin bars slidable at their inner endsvradially t rough said box structure to carry their outer ends towardor away from said base, said base havingnotches for re ceiving the outer ends of saidbars, the oppobars hava plate resting in said box its ends engaging in said bar and a polygonally ended stem cast integral with said plate and extending therefrom through said cover opening.

2. In a man-hole cover structure, the combination with a base comprising a Vertical base ring forming a cover seat, a cover resting on said seat and having a central opening therethrough, a box-like structure cast integral with the cover on the lower side thereof, locking bars slidable at their inner ing notches, structure with ends through said box-like structure at the 1 sides thereof, said base having openings for receiving the outer ends of the-bars and the opposite sides of the inner ends of the bars having notches, an actuating key for the bars comprising a plate and asteln integral therewith, said box-like structure having a longitudinal slot in its base between the looking bars into which the key plate may be inserted and then turned into position trans: verse of the box structure notches of the locking bars, extending through the cover opening, and projections on the outer ends of said bars for limiting the outward movement thereof to prevent turning of the key plate into parallelism with the box structure slot there- .by'to prevent escape of the key.

' In a man-hole coverstructure the combination. with an annular base 'having a cover seat, a cover restin on said seat, a box-1ike extension from t e lower face of said cover at the center "thereof, guide bars the key stem 'slidable through said box extension at the 7 sides thereof, said base havingslots for receiving the ends of said bars, the inner ends of the bars having notches, a key in said box extension engaging with its ends in said notches, said coverhaving an opening therethrough, a stem extending upwardly from said key through said' opening having a polygonal end whereby a wrench may be applled to effect turnin of the stem and key and thereby radial shifting of the lock ting bars, there being a longitudinal opening through the floor of the -.box extension iof less width than the length of said key but of suflicient length to allow insertion ;of the key into the box extension, said key to engage in the gafter insertion extending substantially at ;right angles with said entrance opening and ilocking bars.

5 4. The combination, with the base having irecesses, of a cover to rest on said base, a bo'X formed integral with said cover having a side opening and two end openings, a plurality of integral strengthening ribs extend- :ing rom substantially the periphery of said vcover to said box, locking bars slidably mounted in said box at their inner ends, guide blocks integrally formed on said cover through which said locking bars slide at theirouter ends, an oblong opening in one -side of said box, recesses formed in said locking bars near their inner ends, a lever oI less'length than the opening in said box but greater in length, than the width of said box and the'ends of which lever are adapted to'enter the recesses in said locking bars fand means for actuating sald lever, substantially as described.

I JOHN MoKEON. Witnesses:

JAMES R; OFFIELD, SADIE M. RYAN.