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Publication numberUS2486697 A
Publication typeGrant
Publication dateNov 1, 1949
Filing dateMay 21, 1947
Priority dateMay 21, 1947
Publication numberUS 2486697 A, US 2486697A, US-A-2486697, US2486697 A, US2486697A
InventorsAlfred G White
Original AssigneeAlfred G White
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Grade pitch indicator
US 2486697 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

NOV. 1 1949. WHITE 2,486,597

GRADE PITCH INDICATOR Filed May 21, 1947 ATTU R N EYS Patented Nov. 1, 1949 UNITED STATES P TENT OFFlCE This invention relates to a grade pitch indicator for grade cutting machines.

It is an object of the present invention to provide a grade pitch indicator which can be placed upon the top of the grade cutting machine where it can be Watched by the operator and to indicate while the machine is in operation the pitch at which th grade is being cut and to indicate to the operator any variance or departure from the grade pitch which is supposed to be maintained by the grade cutting machine.

Other objects of the present invention are to provide a grade pitch indicator which is of simple construction, inexpensive to manufacture, easy to mount on the grade cutting machine and efiicient in operation.

For other objects and for a better understanding of the invention, reference may be had to the following detailed description taken in connection with the accompanying drawing, in which Fig. '1 is a rear elevational view of a grade cutting machine in operation and with the grade indicator mounted upon the same to indicate the pitch or the grade being cut by the machine.

Fig. 2 is an enlarged front elevational view of the grade pitch indicator.

1 Claim. (01. 33220) Fig. 3 is a cross-sectional view taken on line 33 of Fig. 2.

Fig. 4 is an end elevational view of the support for the Weight indicating element.

Fig. 5 is a top plan View of the support.

Referring now to the figures, I0 represents a grading machine or tractor having a scraper blade I I attached thereto and a rear wheel support I2. This grade cutting machine, as shown in Fig. 1, is operating upon the ground to cut a grade and on the top of the same there is mounted my grade pitch indicator I3 embodying the features of the present invention. This indicator I3 includes a main support or frame I4 adapted to be attached to the top of the grade cutting machine by bolts l5 extending downwardly through feet portions or flanges I 6 on the bottom of the support I4 and into the top of the grade cutting machine. Along the bottom of the support is an arcuat shaped portion or web I! having a measuring scale I8 thereon with the zero indication at the center and with negative and positiv indications extending respectively from opposite sides of the zero indication to indicate the angle which the machine is operating and the grade being cut by the scraper blade I I.

At the top of the support, there is provided directly above the zero indication a hub having an opening I9 through which extends a bolt or pin 2| on which is pivoted as indicated at 22 a pendulum or arm 23 having a ball Weight 24 and a pointing portion 25. The pointing portion 25 extends over the scale I8 and will indicate the degrees at which the scraper blade is tilted. The shaft 22 has a head portion 26 adapted to retain a spring 21 which reacts upon the upper end of the pendulum 23 to retain the same against axial displacement upon the bolt 2|. The tension of the spring 27 can be adjusted by turning a wing nut 28.

In operation the ball weight 24 will cause the pendulum 23 to swing and to give an indication to the operator of the grade cutting machine, the grade which is being cut. If the operator has departed from the desired grade an adjustment will be made of the scraper blade upon the machine to bring the machine to the proper grade and the pendulum to the proper position so that it indicates the' true grade angl upon the scale I8.

While various changes may be made in the detailed construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claim.

I claim:

In a level indicator, the combination which comprises a vertically disposed substantially open frame having end posts with outwardly extended foot flanges with bolt holes therein, the upper ends of said posts connected by inwardly and up- Wardly sloping arms carrying a horizontally disposed centrally positioned hub, and the lower ends of said posts connected by an arcuate intermediate web, the upper inner edge of which is on a radius described from the center of the hub of the upwardly sloping arms, said web having a graduated scale thereon, a pin having a head on the forward end and with the opposite end threaded carried by the hub, an arm having a ball Weight on the lower end and provided with a pointer below the weight, pivotally mounted on said pin, a spring between the head of the pin and arm frictionally holding the arm to restrict swinging thereof, and a thumb nut on the opposite end of the pin for adjusting the tension on the spring.


REFERENCES CITED The following references are of record in the file of this patent:


Patent Citations
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2555954 *May 20, 1949Jun 5, 1951Ragnar A BrufiatGravity actuated guide for farm machines
US3295219 *Mar 31, 1964Jan 3, 1967Universal Equipment Co IncDegree and angle indicator
US3312361 *May 6, 1965Apr 4, 1967Foster William EConverter unit
US3846781 *Jan 10, 1973Nov 5, 1974L SmithSlope indicator and roll-over warning indicator for earthmoving equipment
US4484186 *Nov 20, 1981Nov 20, 1984Wood Lawrence REarthquake indicator
US4798087 *Aug 20, 1987Jan 17, 1989Kabushiki Kaisha KenwoodInclination detector
US5450909 *Dec 13, 1993Sep 19, 1995Stevenson; RobertGrade determining method and apparatus
US9188436Jun 5, 2013Nov 17, 2015John C. MillerGradient measuring apparatus and system
US9222770Sep 2, 2015Dec 29, 2015John C. MillerGradient measuring apparatus and system
US20080052929 *Oct 23, 2006Mar 6, 2008Adepco Technologies Corp.Level indicator for snow plow
USD743280Dec 16, 2014Nov 17, 2015John C. MillerGradient measuring apparatus
U.S. Classification33/344, 172/4.5, 172/430, 33/402, 33/370, 116/DIG.130
International ClassificationG01C9/12
Cooperative ClassificationY10S116/13, G01C9/12
European ClassificationG01C9/12