US2196460A - Safety hook - Google Patents

Description

R.K.AHERTEL SAFETY HOOK Filed April 15, 1936 fi/cbara A. Heffel: 'INVENTOR.

BY 664M ATTORNEYS.

Patented Apr.- l 1940 I Z onist UNITED STATES PATENT OFFlCE .1

' I 2,196,460 v v d v SAFETY HOOK I Richard K. Hertel, Vernon; Califi, assignor to Byron Jackson 00.; Huntington Park, Califi, a

corporation of Delaware a d Application April 1a, 1936, Serial :No. 74.109

5 Clain s. (c1. 294982) This invention relates to safety hooksv such as are used for handling oil well rods Ortubing. More particularly the invention relates to .improvements in that type of rod hook shown in 5 Joseph F. Moody and Virgil L. Du Bois.

vide an improved safety latch for books offthe Moody-and Du-Bois type.

. lever which can noobecome entangled in the hand of anoperatorif the book should fail to swivel properly. I 7

Another object is to provide a locking arm cally when a bail is inserted into the hook socket.

. Another object is to provide an improved housing construction for a spring swivel hook.;

Other objects and advantages will be seen from the folding description and drawing.

Figure 1 is a vertical elevation, partly in cross section, of one form of my invention showing the hook in the closed position. I Figure 2 is; a vertical elevation. partly in cross section of a hook similar to that shown Figture l, but provided with a spring for supporting the load resiliently. The hook is shown in the open position.

" in Figure 1. I I

Like numerals indicate-like parts in the various figures.

having a shank portion I; a hody portion; and a.

locking arm is is piyoted'intermediate its ends in the slot 1 l as indicated at Ill. The outer end of locking arm i3 is provided with lateral lugs ..forming a T shaped headl'l; The inner end of ed to be engaged by a bail. indicatedin dotted lines at 20 to move thelocking arm to the closed position when; a loadis i-mposed thereon. To insure that, the lockingarm will be fully closed surface of the bill 5 gsee Fig. 1). 'The lower 6 side'of tall 119 is provided with a downwardly Reissue Patent No. 16,6l3-, issued May 3, 1927,10

W -.Th Another object is to'provide'a latch actuating which not only prevents a bail from jumping out released and will l e-closed and locked automati- Figure3 is a front elevation of the hook shown The hook comprises a hookeshaped member bill portion 5, forming abail-receiving socket l;

locking arm [3 comprises a. tail portion lfladapt even though the bail 20 does not1seatsquare1y on the tail 13, said taillsprovided with a raised portion 2! which extendsslightly above the top pressionspring 2 housed in a recess 21 formed in the lower portion of the hill. 5. The" spring 2:5 norma1lyurges the locking army [3 to the open 'pcsltionshown in Fig.2. A stop 29 on the locking arm 13 engages a; shoulder .31 inn-ill 5 to'limit. the opening movement of thelocking rectly above the pivotpin lli. Avertical slot as v hookmember '3 is provided on f-its front face with an inwardly extending pocket '33 diextends downwardlyfrom pocket. 33 through the body 3 "and vis adapted'to. receive the shank offthe locking arm t3. Thelower wall 3"! of the pocket '33 provides a shoulder against which the loweriaces of the'T head M will bear if theioad on the hook becomes large'enoughr A latch lever 33 is positioned within thechannel I and is pivoted intermediate its ends to-[thebody 3 as-shown at it. The lower end. of the latch lever 39 is provided with a cam face it adapted to engage acurved cam face 45 on the tail {9 when the locking arm 13' is inthe open position (Fig. 2) The latch lever iifl is provided neardts lower'end with a stop ll adapted to enag e the forward Wall of the channel-Tl to limit the-outward movement of the latch face it to a position flush with the inner faceof the bill- The upper end of the latch lever 39. is provided with ahand grip 49 which extends outwardly K through the recess 9. Inward movement ofgthe head 49 is limited by a stop- 51 which engages the wall oi the shank I. A coil compression spring 53 is housed .in a pair of pockets Standv 57 formed in-the shank and lever, respectively,

and: isadapted. to normally urge the latch lever to the locked position. The lower end .of the latch lever 3-9 is provided with adownwardly facing cam surface59 adaptedto coact with-an upwardly facing cam surface St on tail is, so, positioned with respect to the pivot pin-4| that the pressure of the tail I9 in an opening direction tends to hold the lever 39 more tightly in I the closed position. p v

d v To: release the locking arm t3 thealever head 49 is pushed toward the shank 5 thus releasing the tail t9- trornthe latch lever 39', whereupon the spring moves the locking arm to to the open'position. shown in Fig. 2. Becauseghooks for use, on oil wells are subject to severeshocks which. tend to open the latching means prematurely, and because such shocks are most-often in a verticaldirection, I post..- H

tionther'two springs 225 and: fit with their axes at substantially a right angle toeach other; with one spring in approximately a horizontal posi 1 tion. Since both of, these springs tend to'h'old the locking arm inthe latched position (when closed) a blow or jar in either the vertical or horizontal plane (which might tend to'compress the other spring. Inasmuch as the spring 53 is the one which isprincipally relied upon to keep the latch locked, I prefer to place this spring in the horizontal position. v

The upper portion of the shank I is provided with ,a circumferential rib 53 which serves as a guard to protect the latch head 49 and the hand of the operator. Y

In the hook shown in Fig. l the upper end of the shank I is threaded as indicated at65 to re-- ceive a nut 61. A bail 69 and ball bearing II surround. theshank and are secured by the nut 61 which is locked to the shank by means of a crosspin 68. A washer I3 is interposed betweenthe nut 61 andbearing II to serve as a cover plate to keep dirt out of the bearing. A lubricator for the bearing is indicated at 15.

The book shown in Fig. 2 differs from the hook shown in Fig. 1 in thatit is provided with a spring end of shank I and locked thereto by some suitable means such as'the cross pin 85. The upper end of the shank extension BI carries a nut 81 which is locked thereto by means of a cross pin 89. A ball bearing 9| is interposed between the nut 81 and the top of the springs and I9. I

The springs 11 and 19 are enclosed in and supported by a housing which, in the example shown, comprises an upper cylindrical member 93. and a lower cylindrical member 95. The lower member 95 is provided with an inwardly extending flange 91 upon which the lower ends of springs 11 and 19 are supported. Member 95 is also provided intermediate its ends with an outwardly extending flange 99. That portion of member 95 which is above the flange 99 is threaded externally as indicatedat IOI, to receive the threaded lower end of the upper cylindrical member 93, thelatter member seating upon the flange 99. The members 93 and 95 are locked against relative rotation by means of a key I03 which is secured in place by a cotter pin I05. The key I03 is received in complementary slots I04 and I06 formed in the upper and lower housing members, respectively. The lower slot I04 is open on its downward side. The cotter pin I05 extends across this opening below the key I03 to keep the key from falling out.

There is only one slot I04 in the lower housing, butthe upper housing is provided with a'series of slots I06 arranged around the lower end of the housing. a I I The upper end of housing member 93 is closed by a wall I0! which serves to keep water and dirt out of the spring housing and bearing. A lubri-' cant fitting I09 is provided in thehousing oppositethe upper position of the bearing 9 I. The upper end of the housing member 93 is provided with a bail member I I I integral therewith.

The foregoing description covers a preferred embodiment of-myinvention, but it is to be understood that the details of construction may be varied within the scope of the appended claims.

I claim: I

1. In a hoistline hook'a body memberv forming a hook portion, a shank extending upwardly from said body, an enlarged head on the upper end of 2,196,460 one of the springs) will not tend to compress said shank, ahousing surrounding said shank comprising an upper member and a lower member detachably secured together, a bail integral with and extending upwardly from the top of, said upper member, an annular inwardly extending flange at the lower end of said lower housing member, a coil compression spring interposed between said flange and said head and antifriction bearing means interposed between said shank thereof, said lower housing member having at its lower end an-annular inwardly extending flange, a coil compression spring interposed between said flange and said head and antifriction bearing means intrposed between'said shank and hous 3. In a hoist line hook a body member forming a hook portion, a shank extending upwardly from said body, an enlarged head on the upper end of said shank,ahousing surrounding said shank comprising upper and, lower housing membersdetachably secured together, complementary registering slots in the threaded ends of said housing members, an opening from one of said slots for theinsertion of a key, a key inserted in said slots,

means for securing said key against accidental removal from said slots, a bail integral with and extending upwardly fromthe top of said upper housing'member, an annular inwardly extending flange on the lower end of said lower housing member, .a coil compression spring interposed between said flange and said head and antifriction bearing means interposed between said shank and housing 4. A hoist line hook as defined in claim 3 in which the upper housing member is provided with a plurality of circumferentially disposed slots adapted to selectively register with the slot in said lower'housing member.

5. In a hoist line hook, a body member forming a hook portion, a shank extending upwardly from said body, an enlarged head on the upper end of said shank, a coil compression spring'surrounding cient to accommodate suspension means and in-' sufiicient to permit the insertion-of said spring through the upperend of said upper housing section, and the lower extremity of said upper housing section beingreadily detachablyflcom nectedto the upper extremity of said lower hous- I ing section, whereby said housing sections may be readily separated to afford access to the interior of said housing.

Y RICHARD K. HER'IEL;

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