US1036096A - Surveying instrument. - Google Patents

Description

E. RGRAVBS.

SURVEYING INSTRUMENT.

' APPLICATION IILED AUG. 28, 1911.

Patented Aug. 20, 1912.

2 SHEETS-SHEET 1.

0-, WASHINGTON, D. c.

E. R. GRAVES.

SURVEYING INSTRUMENT.

APPLICATION FILED AUG. 28, 1911.

'2 SHEETS-SHEET 2.

w IIQWUFQI m v Patented Aug. 20, 1912.

coLuMmA PLANOGRAPH C0,, WASHINGTON n c EDWIN R. GRAVES, OF ST. LOUIS, MISSOURI.

SURVEYING INSTRUMENT.

Application filed August 28, 1911.

in surveying instruments.

One object of the invention is to provide a surveying instrument having an improved construction and arrangement of supporting mechanism for the sighting tube whereby the latter may be readily adjusted for sight- 1 ing in any direction.

Another ob ect 1s to provlde a surveying or leveling instrument which will be simple,

strong, durable and inexpensive in construction, efficient and reliable in operation and well adapted to the purpose for which it is designed.

With these and other objects in view, the invention consists of certain novel features of construction and the combination and arrangement of parts as will be more fully described and claimed.

In the accompanying drawings: Figure 1 is a side view of my improved surveying instrument; Fig. 2 is a central vertical cross sectional view on the line 2-2 of Fig. 1; Fig. 3 is a central vertical longitudinal sec tion; Fig. 4 is a horizontal sectional view on the line H of Fig. 3; Fig. 5 is a vertical cross section through the sighting tube on the line 55 of Fig. 3; Fig. 6 is a similar view on the line 6-6 of Fig. 3; Fig. 7 is a detail perspective view of one of the ferrules employed in the ends of the sight ing tube for securing the lens and sighting disk in place; Fig. 8 is a detail view of one of the spacing blocks employed between the level and the sighting tube.

In the embodiment of the invention, I provide a socket 1 having on its lower end an annular radially projecting base plate 2 which is adapted to be screwed or otherwise secured to the head 3 of a tripod or to any other suitable support. The socket 1 is provided with tapered or outwardly flared inner side walls 4 as shown and in the sides of the socket at suitable distances apart Specification of Letters Patent.

Patented Au 20, 1912.

Serial No. 646,432.

gaged post supporting and adjusting screws 6 the inner ends of which are adapted to engage and support av tube and spirit level supporting post 7 which is engaged with the tapered recess of the socket 1 and has its end rounded to fit the rounded inner end of the socket whereby said post may be readily adjusted to the desired angle by the screws 6. V v

Adapted to be revolubly engaged with the upper end of the post 7 is a tube supporting frame 8 comprising side plates 9 the upper portions of "which are provided with curved lugs 10 adapted to fit around the lower side of the sighting tube 11, said tube being brazed or otherwise rigidly secured to the lugs. In the side plates 9 between the lugs 10 are formed openings the purpose of which will hereinafter appear. The side plates 9 are connected together at their lower edges by an'integral bottom plate on which is formed a centrally disposed cylindrical socket 12 which is adapted to loosely engage the upper end of the post 7 as shown whereby the tube 11 is revolubly supported.

Arranged in the frame 8 between the side plates 9 is a longitudinally disposed spirit level 13, said level being held in the frame 8 in parallel relation to the tube 11 by clamping screws 14 arranged in the bottom plate of the frame 8 and adapted to be screwed up into engagement with the lower side of the spirit level 13 whereby the latter is securely clamped against spacing blocks 15 arranged in the frame 8 between the side plates 9. The blocks 15 have a curved upper surface as shown in Fig. 8 adapted to fit the adjacent curved side of the sighting tube and have flat lower surfaces adapted to fit the flat upper surfaces of the spirit level ends. By thus arranging and securing the spirit level the latter may be readily removed for any purpose and quickly replaced and fastened in position.

The ends of the sighting tube 11 are enlarged and threaded interiorly for a suit-able distance as shown to provide seats 16 and 17. With the seat 16 in one end of the tube 11 is adapted to be engaged a glass disk 18 while with the seat 17 is engaged a sighting disk 19 having formed therein a centrally disposed perforation or sight-ing hole 20. The disk 18 and sighting disk 19 are held in place in engagement with their respective seats by ferrules 21,- said ferrules having reduced exteriorly threaded inner ends and having the surface of their outer ends milled or checkered whereby the ferrules may be readily screwed into and out of the exteriorly threaded ends of the sighting tube. The milled surfaces of the outer ends of the ferrules are perfectly flush with the outer surface of the tube as shown.

By providing a socket and a supporting post such as herein shown and described it will be seen that the sighting tube of the instrument may be adjusted to any desired angle of inclination within certain limits and in any direction, in which position the same may be securely fastened by the screws 6. The pivotal engagement of the tube supporting frame with the post 7 will aermit the tube to be readily turned to the desired position or in the desired direction. By providing the spirit level 13 and arranging the same as herein shown and described the position of the tube will be indicated. The glass of the level may be readily observed through the recesses formed in the side plates 9 of the frame between the lugs 10 as hereinbefore described.

The disk 18 is provided with any suitable center indicating marks and is here shown as being provided with lines 22 which cross at right angles to each other in the center of the disk.

From the foregoing description taken in connection with the accompanying drawings, the construction and operation of the invention will bereadily understood without requiring a more extended explanation.

Various changes in the form, proportion and the minor details of construction may I be resorted to without departing from the principle or sacrificing any of the advantages of the invention as claimed.

Having thus described my invention, what I claim is:

1. A surveying instrument, comprising a socket having a tapered recess, "means to secure said socket to a suitable support, a supporting post loosely arranged in said socket, a series of radially disposed post in said socket and adapted to engage said post whereby the same is adjusted and held in position, a tube supporting frame revolubly mounted on said post, a sighting tube secured to said frame, and a spirit level.

arranged in the frame whereby the position of the latter and the tube 1s ndlcated.

2. In a surveylng instrument, a socket adjusting and supporting screws arranged I having a tapered recess, means to attach sighting disk arranged in the other end of the tube, said disk having formed therein a centrally disposed sighting aperture, ferrules adapted to be screwed into the ends of said tube'whereby said disks are removably held lnplace, a splrit level arranged in said frame, spacing blocks arranged'between said level and the adjacent side of the tube, and clamping screws arranged in' said frame and adapted to be screwed into engagement with said spirit level whereby the latter is clamped against said spacing blocks and thereby removably held in position. r v v V In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses. V

EDI/VIN R. GRAVES. Witnesses: j

DANIEL W. YORKE, HENRY L. LINS.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G.

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