US1843992A - Well pipe elevator hinge - Google Patents

Description

i'Feb. .9, 1932.. N. K. sMm-i'.

WELL PIPE ELEVATOR HINGE 2 Sheets-Sheet 1 Original Filed Dec. 7, 1929 9, 1932. N. K. SMITH 1,843,992

WELL PIPE ELEVATOR HINGE Original Filed Dem-7, 1929 2 Sheets-Sheet 2 Inventor Attomqys operations of Patented Feb. 9, 1932 *a i ra sr NELSON K. SMITH, or Los ANGELEs, cALIronnIA, AssIGnoR To BYnOn Acxson co,

OF LOS ANGELES, CALIFORNIA,

n CORPORATION OF DELAWARE I 1 -WELL PIPE ELEVATOR .I-IINGE 1931. Serial This invention relates to elevators of'the type employed for raising and lowering well casing, pump tubing, and the like, in the drilling a well and maintaining the well in production after it is drilled; it relates particularly to a feature of construction applicable to double door elevators comprising two doors orclamplng members, both of which are hinged toa single yoke section.

An object of the inventionis to provide in a double door elevator a simple, yeteffective, means for causing both doors to open simultaneously through the same angle with respect to thecommon yoke member to which they are hinged. V

This application is a division of my application Serial No. 412,479, filed December 7, 1929.

In the accompanying drawings:

Figure 1 is a plan view of my elevator clamp in closed position; V Figure 2 is a horizontal section showing more clearly the mechanism for securing symmetrical motion of the doors;

Figure 3 is a rear elevation of the elevator; and a Figure 4 is a vertical section in a plane passing through the center of the clamp; from front to rear. 1

Referring to Figure 1, my elevator comprises two main clamping members or jaws 1, which are hinged to a rear yoke 3 by pins 14. As shown in Figure 3, the pins 14 pass through ears 16'on the jaws of the clamp and ears 17 on the yoke 3. Handles 4 are formed on the front of the clamps whereby an operator can readily open or close them, and a latch mechanism, indicated generally at 5, is provided to lock the jaws in closed position. The latch mechanism is fully described and claimed in my original application Serial No. 412,479. Latch mechanisms of different types are wellknown in the art, and, since the particular type employed with the present invention is immaterial, it need not be described in detail. 7 j

In a double door elevator of the type described, it is desirable that the two halves of 412,479. Divided and'this application 'filed June 39, No. 547,310. v I i clamp open by equal amounts'with respect to the center yoke 3: to which they are Tes PATENT! FFI hinged. Various means have been employed j in 'the past for securing this result. One expedient is to provide intermeshing gears the pins 14, so that whenever one half of the 155' '4 i I on the clamping members 1 concentric with clamp rotates with respect tolthe yoke- 3,-,it'

c uses acorresponding rotation,of the oppo-e site clamp about its axis. V 1

V In accordance with the present invention, I eliminate the necessity of using gears tojpro- .duce symmetrical motion between the two halves of the clamps by providing a floating dog '18, positioned approximately I midway between the hinge pins' .14, thatengages with the sides of recesses 19 in the ears on clamps or door-1. g v 7 I Referring part'cularly to Fig. 2 for an un derstanding of the. operatiOn-ofthe invention, it will 7 an'dfront lips 21 of: recesses 19 form openings only slightly wider than the thickness of the bar 18 so,that, if theoperator opens only one door of the elevatorthe rear lip be observed-that thefrear lips 20 on that door strikes-bar '18 and forces it for ward until the front side of the bar strikes the front lip21 of the opposite recess and forces the opposite door to open simultaneously with the first. Similarly, if the operator; closes only one door the front lip 21 on that door strikes the bar 18 and forces it against the rear lip 20 of the opposite door, piausing it to close simultaneously with. the

rst. i Since the door-1 swings through a rather large arc in opening, it is necessary to make the recesses 19 wider at their innermost ends than between the lips 20 and 21. Thus, as shown in Fig. 2, when the doors are Open, the front faces of the recesses 19 lie substantially parallel to and in contact vwith the front face of bar 18. In the closed position of the doors the condition is reversed, since the ears 10 will have then swung .throughan arc such that the rear faces of recesses 19 lie parallel to and in contact with the rear face of bar 18.

The top and 1,9 and of the bar 18 are plane, parallel sur bottom faces of the recesses faces and their vertical dimensions are such that the bar fits loosely; hence its position Within the'recesses is determined solely by forces exerted upon it by lips 20 and 21.

The hinge construction described is simple and cheap to manufacture, cannot get out of order, and effectively performs the functionof forcing. the two doors to open and close simultaneously.

I claim:

1. An elevator of the characterdescribed comprising doors provided in their inner facescwitlr concave recesses, amember" positioned between and pivotally connected-With the doors, said doors being provided in their adjacent faces adjacent to the pivots with recesses; and a floating bar'havingits oppo site ends positioned in" the" last mentioned recesses. I

2;. An elevator of the character described comprising doorsprovided in their inner faces with concave recesses and each pro videdwith anear; a member positioned between the doo'rs-, pivots connecting said meinher With the ears, said ears provided intheir adjacent faces wifih recesses, and a floating bar having-its'opposite end's po'sitioned inthe last mentioned recesses; V

31 An elevator-of thecharacter described comprising" doors provided in" their inner faces with concave recesses and each provided with an ear, a member positioned between the doors, pivots connecting said memher with the ears; said ears provided with plain convexadja'cent faces withrecessesin said faces, and a floatingbar having its opposite ends positioned inthe last mentioned recesses;

Signed at LOSAngeIeS; day of June, 1931 a-Ii fornia this 4th NELsoN K. SMITH;

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