US2576203A

US2576203A - Pipe wrench with linked gripping means

Info

Publication number: US2576203A
Application number: US114486A
Authority: US
Inventors: Allen B Wilson
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-09-08
Filing date: 1949-09-08
Publication date: 1951-11-27
Anticipated expiration: 1968-11-27

Description

Nov. 27, 1951 A. B. WILSON PIPE WRENCH WITH LINKED GRIPPING MEANS 2 SHEETS--SHEET 1 Filed Sepl', 8, 1949 ATTORNEYS Nov 27 1951 Y A B WIL$QN 2,576,203

PIPE WRENCH WITH LINKED GRIPPING MEANS 2 SHEETSSHEET 2 Filed Sept 8, 1949 w QM '65 x5 zz z INVENTOR ATTORNEYS Patented Nov. 27, 1951 ,UNITED"STATES PATENT OFFICE: Q

P IPE WRENCH WITH LINKED GRIPPING MEANS Allen B. Wilson, Galena Park, Tex. Application September 8, 1949, Serial No. 114,486

This invention relates to rotary wrenches.

An object of this invention is to provide a powered wrench for clamping engagement about a pipe or other round object, whereby the article engaged-with the wrench. may be rotated; and the: gripping force willg proportionately. crease with rotation of the article and withetiihdrea'se in the torsional strain thereon.

Another object of this invention is to provide a powered wrench which can be easily clamped about the article between the ends of the latter, and can be used for turning the article in either direction.

A further object of this invention is to provide a rotary wrench in which the motor is mounted in the handle or if desired a flexible drive shaft may be connected to the wrench.

With the above and other objects in view, my invention consists in the arrangement, combination and details of construction disclosed in the drawings and specification, and then more particularly pointed out in the appended claim.

In the drawings,

Figure 1 is a plan view, partly broken away and in section, of a rotary wrench constructed according to an embodiment of this invention,

Figure 2 is a fragmentary sectional view taken on the line 2-2 of Figure 1,

Figure 3 is a fragmentary sectional view taken on the line 3-3 of Figure 2,

Figure l is a fragmentary sectional View taken on the line 4--4 of Figure 1.

Referring to the drawings, the numeral l designates generally a handle which is of tubular construction and is provided at its rear end with one or more ears I I, having an opening i3 therethrough, by means of which the handle may be anchored or secured to a stationary element.

The forward end of the handle it has rockably secured thereto an arcuate member l2 which is mounted on a pivot l4. A bolt I5 is threaded through an ear l6 carried by the handle ill and is adapted to bear against the arcuate member l2 on the rear side thereof so as to limit the rocking of arcuate member |2 with respect to the handle H).

The arcuate member l2 has extending therefrom pivotally connected link members l1 and I8, with the last member Ha adapted to be releasably connected to the adjacent end of the arcuate member l2 as will be hereinafter described.

The links |8 have rotatably mounted therein friction rollers l9 and the arcuate member l2 has mounted in the inner concave side thereof 101mm. (CI. 81-57) 2 Y a friction rollers 23 which are adapted to engage the periphery of a pipe or work piece 2|. Gears 22 are fixed to the shafts '23 on which the rollers H) are fixedly mounted, and gears 22 mesh with intermediate gears 2'4 mounted on shafts-25 carried by the links H.

A pair of latching hooks 26 are rockably mounted on pins 21 which are carried by a U-shaped latch operating member 28. The latch operating member 28 is rockably mounted on an adjacent gear roller shaft 23 and the latch operating member 28 includes a handle or U-shaped bar 29 projecting outwardly therefrom. A pair of latch pins 3%] are secured to a pair of links 3| which are formed with elongated arcuate slots 32 Within which the adjacent ends of

shafts

23 and 25 are adapted to loosely engage. The inner end of the links 3| engage about pivot members 33 carried by ears or straps 34 which are fixed relative to the handle ||l so that when the arcuate member |2 rocks on the pivot member l4 under frictional contact of the rollers 20 with the work piece 2|, links 3| will be moved to the right, as viewed in Figure 1, so as to thereby more firmly tighten the chain about the Work piece 2 I, depending on the torsional resistance of the work piece 2|.

The several rollers 20 are rotated by means of a motor or power member 35 or through a flexible drive means (not shown) which is mounted in a housing 36 carried by the rear of the handle H). A motor shaft 31 extends from the motor 35 and has a worm 38 secured thereto or formed integral therewith. The shaft 31 engages through

bearings

39 and 40 which are carried by the handle l0, and worm 38 meshes with a worm gear 4| which is mounted on a transversely disposed shaft 42. The shaft 42 also has fixed thereon a spur gear 43 which meshes with an intermediate spur gear 44 rotatably mounted on the pivot member l4 and intermediate gear 44 meshes with the adjacent roller gear 22 which is carried by the: arcuate member I2.

In the use and operation of this device, the chain shaped head of the wrench is engaged about the pipe or work piece 2|, the latch operator 28 being initially pulled outwardly so as to move the latch hooks 26 forwardly by reason of the eccentrically mounted pins 21 carried by the operator 28. When the operator 28 is moved inwardly to the position shown in Figure l, the latch members or hooks 2B which are engaged with the pins will draw the chain tightly about the work piece 2| so that the friction rollers l9 will firmly engage the periphery of the pipe or work piece 2 The motor may then be operated so that the "the Wrench is merely turned over when a reverse movement is desired.

In the event the latch members 26 do not provide for'the'fii'rii Contact of the

rollers

19 and 20 with the work-piece, the adjusting bolt l may be loosened so that the arcuate member [2 may rock counterclockwise with respect to the handle l0 and thereby cause the link 3! to move to the right and eifect a contraction of the circle formed by the links I! and I8 and the arcuate member I2.

The construction of housing links I! and [8 permits the chain to open onlyenough to slip the open section of the wrench over the workpiece. This will facilitate putting on and taking off the wrench.

I donot mean to confine myself to the exact details of construction herein disclosed,- but claim all variations falling within the purview of the appended claim.

What I claim is:

A' rotary wrench comprising a handle, a work encircling chain carried by said handle, said chain 4 including a relatively long arcuate link pivotally secured to said handle and constituting one end of said chain, releasable latch means connectingthe other end of said chain with said handle, friction rollers carried by'said chain, a gear train connectingsaid rollers together, a pair of forwardly projecting arms carried by said handle, an arcuate link pivotally connected at one end thereof to eaharm, a keeper piri carried by the opposite end of each link and en'gageable by said latch means, torsional pull of said rollers in one direction effecting rocking of said handle relative to said -l-ong link in a directionrto effect contraction of said chain about the work, and adjustable means limiting the rocking of said handle relative to'said long link. 7

- ALLEN B. WILSON.

REFERENCES CITED file of this patent: UNITED STATES PATENTS The following references are of record in the