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Publication numberUS2263871 A
Publication typeGrant
Publication dateNov 25, 1941
Filing dateJun 14, 1940
Priority dateJun 14, 1940
Publication numberUS 2263871 A, US 2263871A, US-A-2263871, US2263871 A, US2263871A
InventorsFrancis Duffy Joseph
Original AssigneeFrancis Duffy Joseph
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Device for raising manhole covers
US 2263871 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Nov. 25, 1941. J. F. DUFFY 2,263,871


Application June 14, 1940, Serial No. 340,444

1 Claim.

This invention relates to improvements in devices for raising and removing manhole covers.

Manhole covers as generally used on city streets are appreciably heavy, weighing in the neighborhood of 325 pounds, and heretofore, have been raised and removed manually with considerable difiiculty,

It is, therefore, an object of this invention to provide a portable device to facilitate the raising of manhole covers and to convey the cover to an out of the way place with an inappreciable amount of effort.

A further object is the provision of a manhole cover raiser comprising a carriage mounted on wheels or the like, the carriage being provided with means for engaging and lifting a. manhole cover.

These and other objects are obtained by the novel construction, combination and arrangement of parts hereinafter described and shown in the accompanying drawing, constituting a material part of this disclosure, and in which-- Fig. 1 is a plan View of the manhole raising device.

Fig. 2 is a sectional view taken on line 2-2 of Fig. 1.

Referring to the drawing, in Fig. 2, there is shown a manhole cover 2, having a central recess provided with machine threads. The manhole cover raising device is shown to comprise a plate 3 having a central aperture through which passes a threaded bar 4, the lower end of which is provided with a machine threaded portion 6 extended into the threaded recess in the manhole cover 2.

The bar 4 is provided with heavy jack threads 5, and extends up through plate 3 into a capstan 1, which is internally provided with heavy jack threads corresponding with the threads on bar 4. The capstan l rests upon ball bearings 8, pcsitioned in a ring 9, which is held in place by an annular projection on plate 3. The capstan I is provided with a recess II which is adapted to receive an actuating bar [2.

Attached to plate 3 are brackets I3 having bearings I4, which support wheels 15.

In operation, the machine threaded portion 6 of bar 4 is screwed tightly into the recess in the manhole cover 2. The bar I2 is then inserted into the recess H and the capstan is rotated to cause the bar 4 to rise through the capstan, lifting the manhole cover with it. After the cover has been raised sufficiently above the level of the street, the device is rolled on the wheels [5 to an out of the way position.

From the above description it will be seen that there has been provided a simple and practical device for conveniently and rapidly raising and moving manhole covers with a minimum of effort. Y

The device can also be used to set manhole heads, which weigh in the neighborhood of 500 pounds. In this case the excavation into which the manhole head is to be lowered is straddled by the carriage of the manhole cover raising device, the wheels of which ride upon a pair of parallel metal beams. The manhole head, which is carried by the device is then lowered into the excavation by manipulating the capstan I. In order to attach the manhole head to the bar 4, a removable metal bar having a central threaded aperture to receive the threaded portion 6 of bar 4 is inserted underneath the upper lip present in the usual manhole head construction.

While the device has been described in connection with manhole covers, it should be noted that it can be effectively used to lift heavy plates of all types which must be removed from time to time.

The foregoing disclosure is to be regarded as descriptive and illustrative only, and not as restrictive of the invention, of which embodiments may be constructed without departing from the general scope herein indicated and denoted in the appended claim.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent, is:

A device for raising manhole covers, comprising a plate having an aperture, a bar freely passing through the aperture, said bar having the greater and upper portion thereof provided with heavy jack threads and the lower end thereof with machine threads adapted to engage similar machine threads in a manhole cover, a capstan rotatably mounted on said plate and threadedly engaging the jack threads of said bar, bearings on said plate upon which the capstan rests, said capstan having a recess in the periphery thereof, a bar adapted to be inserted in said recess to rotate the capstan, brackets attached to said plate,

and wheels rotatably supported by said brackets.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2637232 *Mar 21, 1952May 5, 1953Titan Tool CoTapped insert driver
US2704473 *Jul 22, 1952Mar 22, 1955 Walther
US2988330 *Nov 12, 1958Jun 13, 1961Wendell CoffeePuller for manhole covers
US3800482 *Jul 31, 1972Apr 2, 1974Sunnen JHoning mandrel with error compensation means
US6464431Jul 20, 2001Oct 15, 2002Mcnulty EdwardApparatus and method for raising buried housings
US6840555Sep 8, 2000Jan 11, 2005Martin ThompsonPanels and lifting implements therefor
US8939434 *May 31, 2012Jan 27, 2015Timothy SelbyMethod and device for removal of vertical manway cover
US20120317799 *Dec 20, 2012Timothy SelbyMethod and device for removal of vertical manway cover
WO2001025132A1 *Sep 8, 2000Apr 12, 2001Martin ThompsonPanels and lifting implements therefor
U.S. Classification254/100, 254/7.00R, 29/280
International ClassificationB66F19/00
Cooperative ClassificationB66F19/005
European ClassificationB66F19/00B