US1618294A - Underreamer - Google Patents

Description

J. oL'soN UNDERREAMER 7 Feb; 22, 1927.

Fiied March.30, 192s 2 Sheets-Sheet 1 1,618,294 Fe 22 1 J. OLSON uunsansmnn Filed March 50. 1926 Y Z Sheets-Sheet 2 Patented Feb. 22, 1927.

UNITED STATES PATENT OFFICE.

JOSEPH Orson, or HOUSTON, Texas.

' UNDERREAMER.

4 Application filed March 30,1926. Serial No. 98,489.

smooth bottom forthe lower endof a bore in the earth for the purpose stated.

A further feature of the invention is to provide an implement of thecharacter described which will. work in soft formation and which is also. equipped with means which adapt it for use in certain kinds of hard formation. I

A still further feature of the invention is to provide an implement of the character described which may be cheapl and easily constructed and easily operate and which is very effective in use. I v

With the above and other Objects in view this invention has particular relation to certain novel features of construction, operation and arrangement-pf parts, an example of which is given 'in thisspecifieation and illustrated in the accompanying drawings, wherein Figure 1 shows a vertical sectional view of the implement partly in section.

Figure 2 shows a cross-sectional view, taken on the line 22 of Figure 1.

Figure 3 shows a vertical sectional view of the barrel, taken on the line 33 of Figure 2, and

Figure 4 shows a vertical sectional view,

showing an outline "of the bore formed and the footing therein.

Referring now more particularly to the drawings, wherein like numerals of reference desi nate similar parts in each of the figures, t e numeral 1' designates a driving shaft, attached to the lower end of which is the barrel 2. This barrel is cup-shaped in form and has a flat bottom. The shaft 1 is extended beneath the barrel and formed with a guide point 3. Fitted over, and slidable on the shaft 1, there is a sleeve 4: which carries a key 5 which works in the lengthwise key way,6, in the shaft, to prevent the sleeve from turning on the shaft, but to permit a limited lengthwise movement of the sleeve on the shaft.

The upper end of the sleeve has the fixed handles 7, 7 by means of which the 'implement may be turned.

Pivoted at their inner ends to the bottom of the barrel, on opposite sides of the shaft 1, are the scoop- like cutters 8, 8, and the "aligned portions 9, 9, of the upstanding rim of the barrel 2 are cut away, forming openings through which said cutters may work, Links 10, 10, are pivoted, at their upper ends, to the sleeve 4, and at their lower ends,

to the respective cutters 8.

The bottom, of the barrel 2 has the radial blades 11, 11, and in front of them theradial slits 12, 12, for a purpose hereinafter to"? be described.

The upper end of the shaft 1 may be- In use the hole, as 15, to be underreamed,

or enlarged, is first formed by the use of any ordinary implement provlded for the purpose. The nut 13 is then either removed, or run up to theuppe'r end of the shaft 1. The implement herein described is. then picked up by the handles 7 and the sleeve will move upwardly on the shaft as far as permitted by the key 5 and this will carry the. cutters 8 into upright position, parallel with said shaft.

The implement is then lowered into the bore until it rests on the bottom and the weight of the sleeve will force the outer, or free ends of the cutters 8 out against the walls of the bore. The implement is then turned by the handles 7 and a downward pressure, at the same time exerted against them and this will gradually force the cutters out into, and-they willcut away the walls at the bottom of the bore. i

It is to be noted that the outer ends of these cutters, at the rear, have the upstand ing arcuate guides 16, 16, which engage the loose earth cut away, and force it throu h the openings 9, 9, into the barrel. Whlle this work is in pro ress the blades 11 will cut away the material at the bottom of the bore which will pass up throu h the slots 12 intothe barrel. As the barre is filled from time to time the implement may be lifted out of the excavation and the barrel em tied.

If very hard strata be encountere the nut 13 may be threaded onto the upper end of the shaft 1 and run down against the upper end of the sleeve 4; and from time to time during the progress of the work may be forced down against the upper end of the sleeve 4 so as to hold the cutters 8 out firmly against the Work.

By the use of the implement herein described the lower end of a bore may be gradually enlarged and at the same time the walls and bottom of the bore kept smooth so as to provide a perfect form for a footing of concrete, as 17.

lVhat I claim 1. A device of the character described including a driving shaft, a barrel fixed thereto and having inlet openings, cutters pivoted at one end to the bottom of the barrel and whose other ends are adapted to work vertically through said openings and project beyond the barrel, a sleeve keyed to the shaft and slidable thereon, links pivoted to the sleeve at one end and Whose other ends are pivoted to said respective cutters.

2. A device of the character described including a driving shaft, a barrel fixed there to and having inlet openings, cutters pivoted at one end within the barrel and Whose other ends are adapted to Work vertically through said openings and project beyond the barrel, a sleeve keyed to the shaft and slidable thereon, links pivoted to the sleeve at one end and Whose other ends are pivoted to said respective cutters and guides on the outer ends of the cutters adapted to guide the out tings through said openings and into the barrel.

8. A device of the character described including a driving shaft, a barrel fixed thereto and having inlet openings, cutters pivoted at one end to the bottom of the barrel and whose other ends are adapted to work vertically through said openings and project beyond the barrel, a sleeve non-rotatable relative to the shaft and slidable thereon, links pivoted to the sleeve at one end and whose other ends are pivoted to said respective cutters, and a nut threaded onto the upper end of the shaft and adapted to abut the corresponding end of said sleeve.

i. A device of the character described including a driving sha'lt; a barrel fixed thereto and having inlet openings, cutters pivoted at one end Within the barrel and whose other ends are adapted to work in vertical planes through said openings and project beyond the barrel, a sleeve keyed to the shaft and slidable thereon, links pivoted to the sleeve at one end and Whose other ends are pivoted to said respective cutters, radial blades can ried by the bottom of the barrel,.said bottom having inlets for the blade cuttings in front of the respective blades.

In testimony whereof I have signed my name to this specification.

JOSEPH OLSON.

Images