US1768787A - Positive pipe tongs - Google Patents

Description

y 1, 1930; R; RAMSAY Y 1768;787

:PO'ISITIVE PIPE TONGS Filed Sept. 8, 192a R0 m5. By ww Patented July 1, 1939 ROBERT Ramsay, on SAND SPRINGS, OKLAHOMA rosrrrvn PIPE Tones nppl i eation'filed September a, 1922:. Serial no. 304,324.

day are deficient in'that part of the forceexerted by the operator of t-hervvrench 1s- PrQp r Po needed to hold the wrench; in its tion upon the engaged ob ect; 7

My invention has for-its object, first,the

provision of tongswhich will so grip they work as to allow all ofthe operators turn ing effort to be used to rotate the casing; second, to provide a wrench which lssymmetrical abbut its center whereby it will not tend to twist in the operators handslwhen being used; third, to provide symmetrically I arranged gripping teeth whereby the engaged work will not be crushed; fourth, to

provide a-wrench which maybe locked in its operative position; and fifth, to provide a wrench which may be readily stood upo its heavy end when not in use. j

These objects, together w'i h and corresponding accomplishments, are 0b t ained by means of the embodiment. of. my

invention illustrated in the accompanying drawing in which: I

Fig. 1 is a plan View of the wrench in a position just before it upon the pipe. r

Fig. 2 is a cross'sectional view through the head of my wrench on the line 2-2 of Fig. 1, the handle and jaws of the wrench 4 being omitted. y

Fig: 3 is a sectional view taken along line 3 3, Fig. 2, one of the jaws being omitted.

Fig. 1 is a cross sectional view on line 4-4, Fig. 3, showing the details of the two pivoted joints.

Fig. 5 is a view along line 55 of Fig. 1 showing the pawl and ratchet construction which is mounted on the handle whereby the handle is held or locked in an operative posi tion.

other objects has been pushed Fig. 6 is a view takenalong line 66, Fig. 4;,Sl1OWlI1g the details of the knuckle joint whereb F shows a diagrammatic sketch illustratlng the toggle arrangement "of the jaws e of the turningforce is lost in whereby non holding the jaws of the wrench in relationship to their work.

Corresponding parts in all of the figures' are designated by the same reference characters.

Referring with particularity to the drawing, the improved wrench, tongs or imple ment thereln shown, comprises inthe main a cast iron or steel casing member or head 10, havlng a and :pivo

handle 20 and two rockers 30- tally mounted thereon. Upon y the" pin therein is relieved of shearin stress.

gripping these rockers are respectively pivotally v mounted jaw s and 60. Both rockers and aws areudentical except one'set is right hand and the other set is left hand.

Referring now more particularly to Fig. 1

1, 10 designates the hollow semi-circular oasing or " head having holes 11, 12 and 13 extending therethrough. Thehole," 12, is the consequently in conjunction-with a pawl '26 mounted on the handle,

. point aboutwhich the handle 20 pivots and the ratchet teeth 14:, which act are circumferentially formed G and S are cular casing formed integrally with the cir- 10. These lugs extend horizontally from'the'casing when the wrench is not being end as the contact with the wrench in a convenient position for use.

Handle 20 is in a-vertical position; When the wrenchused it. may be stood on its rockers and jaws .recede back into the casing 10. Thus the lugs come in the floor and aid in holding is pivotally mounted inside of the casing head by means of a pin 15 which passes through a hole 16 in the end of the handle.

(Jam surfaces 21'and 22. are prov vided near the pivoted end of the handle as clearly show n in Fig. 3'. A small lug 23 prevents excessive movement of the handle A- small -c hamber 2 1 is formed integral withthe, handle and a spring 25 and a plunger 18 are housed therein. This spring is connected to the plunger and is compressed by. inward movement of same.

Pawl 26 is pivotably mounted upon the handle 20, by means of a stud 27. This pawl has s uare surfaces19 and 28 as-shown in Fig. l. rdifnarily the plunger 18 is held in engagement with the shoulder or square surface 19 thus rendering the pawl and ratchet locking means inoperative. However, when the tongs are operated by 'two or more men it is desirable to lock them in place and this is accomplished by turning the pawl so that surface 28 contacts with the plunger. 'A small lug 31 provides a means for the. release of the pivot.

The hole 11 in the main head provides a seatfor the pivot pin 33 and the hole 13 provides a seat for the pivot pin 32. These pinsare rigidly attached or made integral with'the corresponding rockers'30 and 40. Rockers and are providedwith surfaces 34 and 35, respectively, upon that end which is opposite to the camming faces 21 and 22 on the lever 20. These rockers also have holes 36 and 37 in which pins 38 and 39 are placed. As shown in Fig. 6 these holes are in the end portion of the rocker opposite to the cumming end. These rock- M3 30 and 40 are provided with bifurcated ends 41 and 42 which form part of the knuckle joint between these rockers and the j aws themselves. Jaws and 60 are pivotally mounted upon pins 38 and 39 in the rockers 30 and 40 respectively. Jaw 50is provided with steel points 32 and 33. Thus the outward move teeth 51 and 52. Jaw 60 is provided with teeth 53 and 54. These teeth are symmetricall placed about the circumference of the P wor (with which they engage. Jaws 50 and 60 are provided with rearwardly extending fla es 55and 56 which have holes 57 and 58 t erein. The pivot pins 38vand 39 hold the jaws in place.

As clearly shown in Fig. 6 the jaws are" provided with a curved surface correspond ing in shape to the curved surface 42-on the rockers whereby knuckle joints are formed between the rockers and its jaws. Thus the pins 38 and 39 are relieved of any shearing stress during the working stroke of the wrench.

Fig. 7 shows a diagrammatic sketch illustrating in part the operation of the tongs or wrench. This figure shows the rockers 30 and 40- pivotally mounted at the fulcrum ment of these two rockerscaused by the cam portion on the handle causes the pins 38 and 39 to advance towards the work. However, the construction of this toggle arrangement 'ofthe wrench is such that the center of the work, designated by O, is at a short.

distance back of the point P, which is the toggle center of this mechanism. Thus, all the force exerted as turning efiort will be exerted on the work as the tendency of the wrench will be to move in the direction opposite to that shown by the arrow, A.

The force exerted along arrow A will be opposed by the reaction of the point, C, on the casing, 10, and hence, after the initial ositioning movement or tendency toward movement of the wrench will occur.

There are other objects, advantages and features of construction and organization,

ber and having cam surfaces thereon, rockers pivotally mounted interiorly of the hollow member'and having one of their ends extending adjacent to the cam surfaces whereb the will be operated by the movemento the handle about its pivot, gripping members pivotally mounted on the other ends of the rockers, said hollow member ex tending past the gripping members when they are in their operative position.

2..In a wrench having a handle and grippin 'members and intermediary connecting mee ianism, the combination of a casing which provides a support for the above re-- ferred to elements, said casing extending ast the above elements and terminating in a plane which is approximately normal to the axisrof the handle when the handle is in its middle or central position.

3. A device of the character deslscribed comprised ofa hollow casing member open atone side and having another opening at the oppositeside, a handle extended th rough said ,last named opening and pivotally mounted within the casing member, rockers pivoted in the casing, jaws pivoted to 1 the rockers, said casing extending past or around the rockers and aws and terminatmg in a Hat portion, said casing member having lugs formed thereon which extend in a direction parallel to the flat portion.

'In testimony whereof he affixes his signature.

' ROBERT RAMSAY.

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