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 numberUS814013 A
Publication typeGrant
Publication dateMar 6, 1906
Filing dateJul 1, 1904
Priority dateJul 1, 1904
Publication numberUS 814013 A, US 814013A, US-A-814013, US814013 A, US814013A
InventorsFritz Baumann
Original AssigneeFritz Baumann
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cover for road-manholes.
US 814013 A
Previous page
Next page
Description  (OCR text may contain errors)

No. 814,013. PATENTED MAR. 6, 1906. P. BAUMANN.



Specification of Letters Patent.

ratenteu March 6, 1906.

Application filed July 1, 1904. Serial Ho. 215,010-

the road metal having to be taken up or disturbed.

In manhole-covers of the ordinary construction, comprising a cover-frame located with capability of vertical adg'ustment in a guide-frame, the inner wall 0 the latter is provided with stepped projections upon which the cover-frame, presenting similar steps, rests. When it is required to adjust the height of the cover-frame, the latter has to be turned. Since, however, the friction between the cover-frame and the well-rolled road metal is considerable, such rotary motion is seriously impeded, so that the metal must be broken up or loosened. According to my invention I overcome this inconvenience by dispensing with steps on the uideframe and providin a ring inside the atter for the urpose o supporting the coverframe. y rotating this supporting-ring the hei ht of the cover-frame can be adjusted without the road metal having to be disturbed, since the cover-frame merely requires to be moved in a direction vertical to its axis.

My invention is shown in the accompanyin drawings, in which' igure 1 is a vertical section of a manhole with cover, the cover-ring being shown in its elevated position. Fig. 2 is a plan of Fig. 1, the cover with its frame being removed. Fig. 3 is a view showing the inside of a portion of the covcrframe, which is here assumed to be opened out fiat, and likewise a portion of the supporting-ring similarly extended.

The cover a may be of any ordinary construction and is carried by a frame I), resting on a ring d, located inside a frame e, which affords guidance to the cover-frame b.

The inner wall of the frame I; is provided with steps b in well-known manner, while the ring (2' presents projections d, which in 006peration with the steps I) enable the coverframe I) to be adjusted in height.

When owing to the road metal being worn down the cover a is to be lowered, the frame I) should be slightly raised in any. suitable manner in order to relieve the ring d from its lead. The ring (1 must now be turned into the desired position, whereupon the coverframe should be given a few blows to cause it to descend. Its conical outer wall essentially facilitates the loosenin of any of the road metal which may be adhering to it. A ti ht joint is effected between the frames 1) e y means of tarred rope c or like packing inserted in a groove in the lower portion of the frame 6, whereby dirt is revented from getting access to the shaft of the manhole.

In event of the road being remade the cover and its frame 65 can be elevated again into its highest position.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

A manhole-cover, comprising a lid, a frame carrying the same and provided with steps on its inner wall, a uide-frame receiving the first-said frame, amv a ring located within the guide-frame and presentlng supports upon which the said stepped frame rests, substantially as described.

In witness whereof I have hereunto signed my name, this 4th day of June, 1904, in the presence of two subscribin witnesses.



Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5205668 *Mar 29, 1991Apr 27, 1993At&T Bell LaboratoriesManhole adapter
US6435764Sep 15, 2000Aug 20, 2002Mcneely P. DennisNondestructive system for adjusting manhole and catch-basin elevations
US6457901Sep 1, 2000Oct 1, 2002Precision Cover Systems, Inc.Adjustable manhole apparatus
US6520713 *Mar 22, 2001Feb 18, 2003Precision Cover Systems, Inc.Height and angle adjustable utility access device and method
US6524026 *Mar 22, 2001Feb 25, 2003Precision Cover Systems, Inc.Adjustable height utility access device
US6955499Sep 25, 2003Oct 18, 2005Precision Cover Systems, Inc.Adjustable utility access
WO2002018713A1 *Aug 31, 2001Mar 7, 2002Prec Cover SystemsAdjustable utility access device
Cooperative ClassificationE02D29/1409