US1968872A

US1968872A - Internal wrench

Info

Publication number: US1968872A
Application number: US678639A
Authority: US
Inventors: Rodney B Campbell
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-07-01
Filing date: 1933-07-01
Publication date: 1934-08-07
Anticipated expiration: 1951-08-07

Description

all

Patented Aug. 7, 1934 j 519683772 l f N Y IN'rERNAL wRENonjw C Roaneyn campbell, Walnut-'Para oa1if.,asl 1 signor `to* vAbraham M.

Park, Calif.

Herbsman, Huntington,

` Applumas 'Julyi'L `1933; seal ne. 678,639

2 Claims. (Cl. 81--7/2) My invention relates tofimproveinents in internal wrenches and4 has forrits principal ob jects, to generally improve, upon and simplify the. construction of the existing formsof internal wrenches and toprovide a wrench having dogs or jawsthat are capable of being radiallyA projected or `retractedinl order `that they may be readily vengaged with the internal face of a pipe, coupling or the like forthe purpose of rotatingthe samewhile said pipe or coupling is being screwed into croutof a part or memberA to whichit is' connected.

- Further objects of my. invention are,`to provide an internal wrench oflthe character referred to wherein the dogs or jaws have interengageinentwiththe `wrench member that is utilized for `projecting and retracting said dogs or jaws so that the latter cannot become detached from the wrench after `the samefhas been assembledY for use and-further, to construct the dogs or jaws and their carrier so thatsaid. dogs or jaws may be 'slightly .tilted circumferentially with respect tothe axis of the wrench in order thatv one edge of each dog or jaw willzbe `positioned so as to engage and .bite into the inner surface of the pipe or` nipple that is being screwed or unscrewed. Y

A further object of my. invention is, to provide. an internal wrench.` of the character referred to that isl` relatively simple in construction, strong andrdurable and which comprises. rela-. tively few parts that'are capable of being readily assembled or taken apart andfthejawsori dogs of which wrench are capable of being casily and quicklyadjusted so as to engage the inner,

surfaces of" pipes, nipplesV and ther like of` vary-v ing internal diameters'. Y 1 .n

With the foregoing and other objects in View my inventionconsists in certain vnovel features of construction and arrangements of parts that.

.the center of an internalzwrench constructedjin` accordance with my invention.`

Fig. 2 is a front elevational View ofthe wrench.- Fig. 3 is a cross section taken en the jline :3a-3- of Fig. 1. i i

jaws or dogs. j Y, Fig. 5 is an end View of one of the dogs or jaws.

Referring by numerals to the accompanying drawing which illustrates a preferred embodimenti of Imy invention, designates the main bodyfofthe Wrench, which is Vpreferably cylindrical inform and one endjof said body is. enlargedgto form ahead- -ll andthe peripheral face of ythis head is provided with a plurality of fiat wrench; receiving faces12.

Formed in the forward portion of thebOdylO. is-an axially disposed' bore or chamber. 13 vand the rear end of `this bore communicates vwith an axially disposed threadedl opening 1,4. that `is formed'through head ll.Y l

' Formed in the forward portionofgbodyyl() isA a: plurality of longitudinallydisposed slots and' the side faces ofl each .slot are-.preferably formed so that they diverge` slightly -towardthe outer face of the body. .i ff'. 1.

A short portion at `theforward end. ofrbody 10 is reduced in diameteras designatedby-lfi and the peripheral: face of this reducedfportion is threaded for the reception of a ring'nut 17, theexternal diameter. ofwhich is substantially. equal tolthe external diameter of body lO'and; theperipheral face of this ringnut is knurled ori corrugated in order that it may be. conveniently gripped and rotated. j

. The externally threaded body 18 of a. sleeve or.` tubular member isscrew-seated in the threaded; opening 14 rand. the outer end of this Vbody is enlarged to form-1.a head4 19 having wrench :rec eiving .faces 2,0.Y i 1 Extending through the sleeve ortubular mem-v ber'l81is a'rod or shank 21 and detachab1ysecured to the end thereof that projects. beyond the rear end ofsleevev 18, is a ringor collar22`.;

Formed integral withV the forwardendof shank 21 is a cylindrical head 23A that occupieslthe bore,

. or chamber 13 in the body ofthe tool and formedA in said head is a plurality of longitudinally disposed slots 24,.which gradually `increase in depth toward. the `forward end ofgsaid head.

The inclined bottom faces of these slotsare preferably flat and forrned` on the side faces of said slots adjacent` tof-and parallel with'thesaty bottom :faces thereof, arci ribs 25Nthat project a short distance into the slots. 1

The dogs or jaws utilized in :imprevedi-v wrench are :formed i of i `substantially vrectangular blocks, 26 of hardened ;metal,the thickness of i A which isslightly less than thewidth-ofthe slots' Fig. 4 is a side elevational View of oneofV the 24 inhead 23 and the slotsl Yin body 1'0 andthe outer faces 27 of these dogs are disposed at right angles to the side faces thereof, thereby providing corners along both of the outer side edges of said dogs.

The inner or bottom face of each dog is inclined lengthwise to correspond with the inclination of the bottoms of the slots 24 and said inner or bottom faces are rounded or made slightly convex in cross section in order that said bottom faces may readily rock on the flat bottom faces of the slots 24.

Formed in the side faces of the dogs 26 adjacent to and parallel with their inner or bottom faces, are grooves 28 which receive the ribs 25 that project from the side faces of slots 24 in head 23.

The engagement of the ribs 25 in the slots 28 retains the dogs upon the tapered head 23 and prevents the disengagement and loss of said dogs after the tool has been properly assembled for use.

The ring nut 1'7 mounted on the reduced threaded forward end of the body retains the dogs against longitudinal movement through slots 15 in the tool body.

After the parts of the wrench have been assembled as illustrated in Fig. 1 and with the inner ends of the dogs positioned in the slots 24 in head 23, said head may be moved forwardly or rearwardly through chamber 13 by screwing or unscrewing sleeve 18 through the rear portion of the tool body.

As the head 23 is moved forwardly within the body, the engagement of the inclined bottom faces of the grooves 24 with the correspondingly inclined inner faces of the dogs 26 will move said dogs radially outward and likewise as head 23 is moved-rearwardly within the chamber 13 in body 10, the dogs 26 will be retracted or drawn inwardly due to the engagement of the ribs 25 in grooves 28.

In the use of the Wrench, the forward end thereof with the dogs in retracted positions, is inserted in the end of the pipe or nipple to be rotated and sleeve 18 is now screwed into the rear portion of the tool body to move head 23 forwardly and such action projects the dogs 26 until their outer edges engage the inner surface of the pipe or nipple.

By means of a wrench or other suitable tool applied to the faces 12 of head 11, the wrench is now rotated and in so doing the transversely curved inner faces of the dogs 26 will rock on the fiat bottom faces of grooves 24 so that said dogs will tilt slightly circumferentially of the tool, thereby causing the corresponding outer edges of said dogs to engage and bite into the inner surface of the pipe or nipple and continued rotary motion of the body of the tool will impart rotary motion to the engaged pipe or nipple so as to screw or unscrew the same with respect to the part to which it is connected.

Thus it will be seen that as a result of my improved construction of the dogs or jaws and the means of mounting the same in the head 23, it is not necessary to resort to any manipulations such as a reversal of position of the dogs or to interchange different forms of the dogs in order to accomplish the screwing or unscrewing of the pipe, nipple or other part that is engaged by the wrench.

The tilting of the dogs as herein explained is automatically effected following the movement imparted to the body of the tool and thus one set of dogs may be used for both screwing and unscrewing operations.

When ring nut 17 is removed from the forward end of body 10, the dogs 26 may be positioned within the slots in body 10 and the slots in head 23 or removed therefrom by a longitudinal movement of said dogs relative to said head and body.

Thus it will be seen that I have provided an internal wrench that is relatively simple in construction, inexpensive of manufacture and very effective in performing the functions for which it is intended.

It will be understood that minor changes in the size, form and construction of the various parts of my improved internal wrench may be made and substituted for those herein shown and described without departing from the spirit of the invention, the scope of which is set forth in the appended claims.

I claim as my invention:

1. In an internal wrench, the combination with a body provided with an axial chamber and with a plurality of radially disposed slots, of a sleeve projecting into the rear portion of the axial chamber in said body and having threaded engagement with the rear portion of said body, a member carried by said sleeve and projecting into the forward portion of the axial bore in said body, the projecting portion of said member having a plurality of slots having flat inclined bottoms, dogs arranged for sliding movement through the slots in said body the width of the slots in said body being slightly greater than the thickness of the dogs to permit the latter to tilt circumferentially of the body for a limited distance, the inner portions of which dogs occupy the slots in said member the bottom faces of which dogs are convex in cross section so as to rock transversely on the flat inclined bottoms of said slots and interengaging ribs and grooves between said dogs and slotted member.

2. In an internal wrench, the combination with a body provided with an axial chamber and with a plurality of radially disposed slots, of a sleeve projecting into the rear portion of the axial chamber in said body and having threaded engagement with the rear portion of said body, a member carried by said sleeve and projecting into the forward portion of the axial bore in said body, the projecting portions of said member having a plurality of slots having flat inclined bottoms, dogs arranged for sliding movement through the slots in said body the width of said slots being slightly greater than the thickness of the dogs so as to permit the latter to tilt circumferentially of the body for a limited distance, the inner portions of which dogs occupy the slots in said member the bottom faces of which dogs are convex in cross section so as to rock transversely en the ilat inclined bottom faces of the slots, interengaging ribs and grooves between said dogs and slotted member, means removably mounted on the forward end of said body for retaining said dogs in the slots in said body and a collar removably mounted on the rear end of the member that extends through said sleeve for holding said member in operative relation with the sleeve and against longitudinal movement therethrough.

RODNEY B. CAMPBELL.