US2035637A - Friction shoe - Google Patents

Description

March 31, 1936. c s. cRlcKMR FRICTION SHOE Filed Mair 7, 1934 Patented Mar. 31, 1936 UNITED STATES ATENT OFFICE i FRICTION SHOE ration of Delaware Application May 7, 1934, Serial No. 724,376

8 Claims.

'Ihis invention relates to new and useful improvements in friction shoes.

One object of the invention is to provide an improved friction shoe for well devices and the Y5 like.

A particular object of the invention is to vprovide a shoe having spring pressed runners adapted to engage the inner wall of a well casing or tubing and arranged so as to center the shoe in the casing or tubing, as well as providing for greater spring tension than can be obtained with the usual upright friction springs, whereby a more positive supporting of the shoe is accomplished.

A further object of the invention is to provide a shoe having runners carried by volute springs disposed transversely of the tubing or casing, whereby the runners may be engaged with the Wall with more equal pressure and also whereby an amplied spring pressure may be exerted on said runners to increase their frictional contact with the wall of the tubing or casing.

An important object of the invention is to provide a shoe having runners carried by springs disposed transversely of the tubing or casing, whereby the runners engage the wall and take all the wear, the springs carrying the runners never being in engagement with the walls.

A construction designed to carry out the invention will be hereinafter described, together with other features of the invention.

The invention will be more readily understood from a reading of the following specification and by reference to the accompanying drawing, in

35 which an example of the invention is shown, and

wherein:

Figure 1 is an elevation of a shoe constructed in accordance with the invention and having its runners in engagement with the inner wall of a well casing which is shown in section, the shoe being in its locked position,

Figure 2 is avertical sectional View of the same,

Figure 3 is a horizontal cross-sectional view taken on the line 3-3 of Figure 1, and

Figure 4 is a view similar to Figure 1, showing the shoe unlocked.

In the drawing the numeral I designates a cylindrical sleeve. The inner ends of curved leaf springs or arms II are riveted or otherwise fastened to the outer surface of the sleeve at equidistant points. The arms extend horizontally or transversely in volute curves with reference to the center of said sleeve. The arms may be made of strips of flat spring steel or other metal of such width as is desired and of the necessary spring tension.

On the outer end of each spring or arm is mounted a vertical runner I2 having its upper and lower ends beveled at I3 so as to ride' over 5 joints and the like in the casing or tubing I4. While the runners may be attached to the ends of the arms in any suitable manner, I prefer to provide a narrow upright flange I5 on the outer end of each arm and to rivet or otherwise fasten each flange to one of the sides of each runner. This leaves the outer faces of the runners free to travel on the inner surface of the casing I4.

By the use of volute arms it is obvious that amplified spring tension can be obtained. By l constructing the shoe so that the arms must be sprung inwardly or retracted to a considerable extent to insert them in the casing I4, or by making said arms of heavier spring metal so that they need not be retracted to such an extent, more tension can be obtained than is possible with the usual upright spring arms. Further the runners, engaging the casing at equi-distant points and owing to their volute curves, will center the sleeve I0 and thus become guides. It 25 is pointed out that the outer side of the runners engaging the inner wall of the casing I4 will be subjected to al1 the wear as they travel vertically within the casing. By observing Figure 3 it will be seen that the volute springs II are never in engagement with the walls of the casing, and therefore do not at any time become worn along their outer surfaces through frictional contact.

The sleeve Ill has a free sliding fit on a collar I6, which may be employed to connect the ends of upright tubular members I'I or any other elements with which the device is to be used. The collar is provided with diametrically opposite lugs I8, which engage in inverted J-slots I9 in the sleeve, such slots being very common in the well 40 art. The sleeve I0 is also provided or formed with connectors I9 which bridge the gaps formed by slots I9 and allow the lug I8 to pass inside of them. Normally the lugs engage in the short legs of the slot, as is shown in Figures 1 and 2, 45 whereby the upper ends of the sleeve and collar both engage and support a washer 25], or any other element with which the anchor is to be used.

I have shown a tubular member ZI, which may be the weight of a tubing catcher resting on said washer and enclosing a coiled spring 22, which is also supported on said washer and partially compressed by said element.

When the assembly is lowered in the casing I4, the lugs I8 burying in the lower ends of the 55 short legs of the slots I9, will push the sleeve downwardly, whereby the runners I2 will slide down the inner surface of the casing. When the tubing I'I. or other element is arrested and 5 lifted upwardly, the frictional engagement of the runners with the casing, will hold the sleeve I0 stationary, whereby the lugs I8 will be moved to the tops of the slots I9, With the lugs in this position, the tubing 'II may be rotated to bring said lugs'over the upper ends ofthe long legs of said slots, whereby the lugs may be lowered in said long legs, as is shown in Figure 4. During this movement the sleeve IU will hold the element 2l in its arrested position, while the tubing I1 is being moved downwardly. 'This operationprovides for the unlatching ofthe shoe.

The amplified tension of the arms I I assures against movement of the shoe during the unlatching operation. They also hold the elements in the center of the casing so that there is no interference between the elements andthe 'casing during either the running operation orfthe unfflatching` operation.

.The :description which has'been given recites V,25..more or-lessdetail of aparticular embodiment ,.of'lthe'invention, which is set forth as new and wuseful; however, Idesire it understood that the invention is not limited to such exact details of y,.construction, because itis manifest that changes ...aofandemodications may be made, within the scope :of the appended claims, without departing from the .spirit of the invention.

What I claim anddesire to secure by Letters i. Patent,:-is:

1. A friction shoe comprising,.a sleeve, transverse spring arms secured at their inner ends to the sleeve and extending outwardly therefrom, and elongated upright runners secured to the f 4outer ends kof said arms. ,140 2. -Afriction shoe comprising, a sleeve, spring arms securedf at their inner ends to the sleeve and curved outwardly in volute curves from the sleeve so as to expand outwardly from the sleeve to their outer ends, and upright runners mounted on the outer ends of the arms.

3. A friction shoe comprising, a sleeve, spring arms secured at their inner ends to the sleeve and curved outwardly in volute curves from the sleeve 5 so as to expand outwardly from the sleeve to their outer ends, flanges on the outer ends of Vsaid arms, and upright runners secured to said flanges.

4. A friction shoe comprising, a collar having 10 lugs, a sleeve slidable on the collar having slots -receiving said lugs, volute spring arms secured at .their inner ends to said sleeve, and elongated upright runners carried by the outer ends of said arms. 15

5.Ay friction -shoe comprising, rigid runners adapted 'to engage the inner surface of a tubular member, a central support, and spring arms curved inwardly from their outer ends substantially horizontally from the runners and attached 2O at their inner ends to said support-wherebysaid runners may be swung inwardly and outwardly without deflectionfrom theirupright planes.

6. A friction shoe-including, a sleeve, an upright elongated runner; and a spring rigidly secured at one end -to the sleeve and at itsV other end to the runner. Y

7. A friction shoe including, a sleeve, a spring having` one end rigidly secured to the sleeve land its other end extending outwardly therefrom, and an upright elongated vrunner secured to the 4outer end of, said spring as itssole means of Vsupport-by the sleeve.

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