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Publication numberUS386768 A
Publication typeGrant
Publication dateJul 24, 1888
Filing dateMar 23, 1888
Publication numberUS 386768 A, US 386768A, US-A-386768, US386768 A, US386768A
InventorsJohn J. Buebows
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
John j
US 386768 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)


COVER FOR MAN HOLES 0R CATCH BASINS. No. 386,768. Patented July 24, 1888.



SPECIFICATION forming part of Letters Patent No. 386,768, dated July 24-, 1888.

Application filed March 23, 1888. Serial No. 269,289.

To all whom it may concern:

Be it known that I, JOHN J. BURROW'S, a citizenof the United States, residing at \Vashington, in the District of Columbia, have invented certain new and useful Improvements in Covers for Man-Holes or Catch-Basins, of which the following is such a full, clear, and exact description as will enable any one skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to covers for man-holes or catch-basins or any of the usual, openings communicating with sewers or subways, and through which access may be gained to such sewer or subway.

The invention has special reference to means for automatically locking the cover, and it is adapted to be attached to any kind of cover used with man-holes, catch-basins, sewer or water traps, or the like. These man-holes or catch-basins occur at frequent intervals in the streets of cities and are usually placed flush with the paved surface of the street,so as not to prove an obstacle to traffic. These covers have to be removable, so that access may be had to the sewer or subway, and many of them are formed with gratinglike openings for ventilation. \Vhere these covers have been laid loosely over the manholes or catch-basins it has been found that the covers become constantly displaced by the wheels of vehicles rolling over them or by horses treading upon them. Again, if these gratinglike covers be loosely laid, there is great liability of the calks on horses shoes becoming wedged in the open ings of the cover and lifting the same off the man-hole. It therefore becomes desirable to have these covers removable and at the same time have them constructed so that they may be locked securely when closed.

The object of my invention is to provide a simple automatically-locking cover to be used with a man-hole or catch-basin. To the afore said purpose Inyinvention, briefly stated,eonsists in a cover removably hinged to the bedplate and provided with a swinging gravitydog having a perforated extension or handle and acting to automatically lock the cover (No model.)

when closed, the dog being accessible from the exterior of the cover thatit may be grasped by the handle for unlocking the same.

The invention further consistsin the details of construction of the various parts of the device, all as hereinafter fully described and claimed.

In order that my invention may be fully understood I,have illustrated iu'the accompanying drawings, and will proceed to describe the best form thereof so far devised by me, such form, however, admitting of modifications.

In the accompanying drawings, Figure 1 is a plan view of a rectangular-shaped catchbasin provided with my improvements. Fig. 2 is a sectional view on line2 2 of Fig. 1. Fig. 3 is a sectional view, similar to that shown in Fig. 2, of a circular-shaped man-hole provided with my improvements.

In the said drawings, like numbers of reference designate like and corresponding parts throughout.

Referring to the drawingsA. is the bed-plate or frame formed with the opening 5. The cover 6 closes over the opening 5 of the bedplate and is removably hinged to the plate by means of the inwardly-projecting locking-lug 7, formed upon the inside of the bedplate, and the cooperating outwardly-projccti ng lug 8o 8, mounted upon the under side of the cover.

In the construction I have shown the lockinglug 7 is an extension of the shoulder 9, which extends entirely around the inside of the bedplate and upon which rests the cover when closed. The interlocking of these two lugs 7 and 8 forms an open hinge, by means of which the cover can be removed when open and can be locked when closed.

On the opposite side of the cover from the log 8 is formed an eye, .10, in which is loosely riveted the eyebolt 11, in the eye of which swings the gravity-dog 12, which is formed with an eye, 13, interlocking with the eye of the bolt 11. The gravity-dog is formed with 5 a locking-lip, 14, which engages the projection 15 upon the bed-plate and automatically locks therewith when the cover is closed, as shown in the drawings. The dog is formed with an extension oppositely disposed to the I00 locking-lip 14, so as to constitute a hand1e,the end of which is provided with a hole, 16, into which a wire may be introduced through the perforation 17 in the cover for retracting the dog, so as to disengage the same from the locking-projection 15, whereupon the cover may be opened.

In the drawings I show two forms of cover, 6, the one in Figs. 1 and 2 being formed'grating-like, and the one in Fig. 3 being solid, with indentations on the exposed surface. In the former construction the gravity-dog may be reached through one of the grating-openings, as 17, while inthe latter construction I have to especially form the perforation 17, through which a wire may be passed in order to grasp the gravity-dog.

The operation of the device is quite evident. The dog being free to swing gravitates into a vertical depending position, as shown in the figures, when the cover is closed, so that the lip 14 thereof takes under the projection 15 of the bed-plate. The cover is unlocked by passing a wire or rod 'through the opening 17, grasping the dog and retracting it into the dotted-line position shown in Fig. 2, so as to disengage the dog from the projection 15, whereupon the cover may be raised.

Having thus described myimprovements in man-hole or catch-basin covers, what I claim as my invention, and desire to secure by Letters Patent, isi 1. The combination, with the bed-plate 4, formed with an opening, 5, and provided with the shoulder 9 and the lug 7, of the cover provided with the lug 8 and formed with an opening, 17, the gravity-dog 12,provided with thehandle perforated at 16 and mounted on the cover so as to swing freely, and the locking projection 15 for the dog to lock with, substantially as described.

2. The combination, with the bed-plate 4, formed with the opening 5 and provided with the shoulder 9 and the lug 7, of the cover 6, formed with the opening 17 and provided with the ing 8, the eyebolt 11, riveted to the cover, the gravity-dog 12, swinging on said eyebolt and provided with the locking-lip 14 and the perforation 16, and the locking projection 15 for the dog, substantially as described.

In testimony whereof I havehereunto set my hand and seal this 16th day ofFebruary,1888, in the presence of the two subscribing witnesses.

JNO. J.-BURROWS. [L. s.] Witnesses:


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US6802962 *May 23, 2002Oct 12, 2004The United States Of America As Represented By The Secretary Of The NavyDeck drain cover plate assembly
US6926245Oct 29, 2002Aug 9, 2005Abt, Inc.Mounting bracket assembly for connecting frame members of a trench-forming assembly and associated method of fabricating frame members
US6942419 *Feb 4, 2002Sep 13, 2005Balco, Inc.Grate assembly
US7033489 *Dec 23, 2003Apr 25, 2006Saint-Gobain Pipelines PlcDrainage assembly
US7172368Jun 29, 2005Feb 6, 2007Abt, Inc.Assembly and method of forming a trench of a predetermined shape
US7588392Apr 24, 2007Sep 15, 2009Zurn Industries, LlcRemovable grate
US7703502Jun 29, 2005Apr 27, 2010Abt, Inc.Method of fabricating a longitudinal frame member of a trench-forming assembly
Cooperative ClassificationE06B9/02