US2040708A

US2040708A - Road grader level

Info

Publication number: US2040708A
Application number: US21853A
Authority: US
Inventors: Persson Linus
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-05-16
Filing date: 1935-05-16
Publication date: 1936-05-12
Anticipated expiration: 1953-05-12

Description

May 12,1936- L. PERSSON 2,040,708

ROAD GRADER LEVEL Filed May 16, 1955 2 Sheets-Sheet 1 W; rll T III lz'izusferas'an 4/ flwaoi iu Attorney Inventor May 12, 1936.

L. PERSSON ROAD GRADER LEVEL Filed May 16, 1935 2 Sheets-Sheet 2 Attorney Patented May 12, 1936 UNITED STATES PATENT OFFICE 1 Claim.

My invention relates generally to a level to be, mounted on a roadgrader to continuously and instantly inform the operator of the roadgrader of the actual crown on the road, and an impor- 5 tant object of my invention is to provide a simple and structurally eflicient arrangement of the character indicated which is accurate and dependable and easily installed.

Other important objects of my invention will 10 be apparent from a reading of the following description in connection with the drawings, wherein for purposes of illustration I have shown a preferred embodiment of my invention.

In the drawings:---

15 Figure 1 is a transverse vertical sectional view taken through a roadgrader and showing the arrangement of the invention mounted on the drawbar of the roadgrader.

Figure 2 is a transverse vertical sectional view 20 taken through one end of the arrangement showing the construction of one of the hydraulic indicators.

Figure 3 is an elevational view taken from the right of Figure 2.

25 Figure 4 is a horizontal sectional View taken through Figure 2 approximately on the line 4-4.

Figure 5 is a transverse vertical sectional view taken through Figure 1 approximately on the line 5--5.

30 Referring in detail to the drawings, the numerals 5 and 6 refer'to the arched longitudinal members of the frame of the roadgrader which lie on opposite sides of and are mounted in connection with the drawbar which includes the side 35 members I and 8. To the underside of the members 'l and 8 is mounted the framework 9 from which depend the arms l and H to the lower ends of which are connected the brackets l2 and I3 which are connected to the rear side of the 40 roadbed engaging element M.

In accordance with the present invention I mount on and across the upper edges of the grader frame members 7 and 8 the U-shaped frame which is generally designated l and which 45 is of angle iron cross section with the vertical flange arranged forwardly and the remaining flange horizontally in protecting relation to the correspondingly shaped level gauge element which is generally designated "3 or I mount the U- shaped frame on the members 5 and 6.

The level gauge element [6 is composed of the relatively small pipe I! which lies on the horizontal part of the frame [5 and connects by a reducing elbow H! to the lower end of the larger 55 tube I9 which is located behind the forward flange of the corresponding vertical end of the frame [5 and laterally inwardly of the remaining flange thereof. The upper end of the tube I9 is closed by a plug 20 in which is screwed a bushing 2| through which works the piston rod 5 22 on the lower end of which is a float piston 23. Below the bushing 2| the rod 22 has squared teeth 24 on its laterally inward side which operatively engage pins 25 extending between and connected to spaced

disks

26 and 21 which extend through an opening 28 in the laterally inward side of the upper part of the tube l9 and are rotatably mounted by and on an axle 29 journaled in lug portions 30 and 3|, constituted by enlargements of the tube IS. The gauge is mounted transversely on the frame bars 18 and intersects the diagonal scraper l4 at approximately its mid point.

The rear end of the axle 29 has fixed thereto the indicator hand 32 which cooperates with an indicia equipped disk 33 which is mounted to the lug 3|.

A roller 34 journaled on a shaft 35 extending diametrically across the tube l9 rolls against the laterally outward smooth side of the rod 22 in a manner to preserve the alignment and easy working characteristics of the rod 22 and to hold the teeth 24 against the pins 25. It is obvious that this arrangement brings the rod 22 in between the

disks

26 and 21, so that mutual cooperation exists between the roller 34, the rod 22, the inner sides of the

disks

26 and 21, and the pins 25, whereby smooth and non-wearing action of the parts is assured.

The small pipe I! is provided adjacent its opposite ends with control valves 36 and 31, respectively, while the center of the small pipe I! has a riser 38 thereon provided at its upper end with a filling cap 38' enabling introduction of the leveling fluid which operates the floats 23. 0

U-bolts 39 and 40 encircle the ends of the small pipe I! and traverse the horizontal flange of the frame l5 for holding the small pipe in place on the frame. An additional similarly arranged U- bolt 4| is centrally connected between the frame and the small pipe, while U-shaped bolt clamps 42 and 43 encircle the tubes I 9 for locking the same in place in the vertical end portions of the frame IS. The floats 23 will be of any suitable buoyant arrangement or construction and work closely although sufficiently loose within the tubes l9.

It can be seen, that in the event the apparatus tilts downwardly toward the left in Figure 1, the fluid in the conduit I! will rise in the tube I9,

Cir

lifting the float 23, which carrying the rack 24 therewith will rotate the wheel 26 located on the shaft 30 with the pointer 32. The variance in grade will be indicated by comparing the pointer 32 with the dial 33.

Although I have shown and described herein a preferred embodiment of my invention, it is to be definitely understood that I do not desire to limit the application of the invention thereto, and any change or changes may be made in the materials and in the structure and arrangement of the parts, within the spirit of the invention and the scope of the subjoined claim.

What is claimed is:

A level indicator comprising an elongated substantially horizontally disposed conduit, a fluid in the conduit, upstanding tubular extensions at the ends of the conduit, a float in each of the extensions, a rack bar extending upwardly from each of the floats, a guide in one end of each of the extensions for slidably receiving the rack bar, one side portion of each of the extensions being provided with an opening, a gear mounted in each opening for mesh with the adjacent rack, each of the said gears being provided with an external shaft, a gauge plate stationarily secured to the outside of each of the extensions and through which the corresponding shaft extends, graduations on the gauge plate and a pointer secured to the corresponding shaft at the front of the said gauge plate.

LINUS PERSSON.