US2004639A - Diestock - Google Patents

Description

June. lll, 1935. WQOQTHEwEs y 2,004,639

\ DIESTOGK Filed April 11, 1955 :inventor /f/MM Patented June 117, 1935 FFI,`

Vaou/insof-v j DIEYSTOCK Y William 0. Thewes, North Ridgeville, Ohio, as-

signer to The Ridge Tool Company:- North Ridgeville, Ohio, a corporation of` Ohio l Application April 11, 1933, Serial No. 665,533

v c claims;Y 4 01. 1105-124) This invention relates to a ratchet tool or die stock. assembly of that type whereina toothed ratchet or drive ring adapted to receivethe tool to be driven is mounted in an actuating Aframe or barrel carrying a pawl for driving the ring. Tools of the type to which this invention relates are used principally as light duty thread-cutters and include in the assembly a set of die holders or heads which range in varying sizes to accommodate the particular diameter of the pipe or other article Vto be threaded and are eachprovided with a drive-ring engaging portion or drive barrel of standard external dimensions kwhich detachably engages in the drive ring.

An object of the invention is to provide means of a simple and easily operated type for retain-- ing a die-holder or analogous part in axially-removable association with the drive ring.

Another object of the vinventionris `to provide an improved type of pawl mechanism for coacting with the teeth of the drive ring whereby backlash or free. running in a driving directionv is reduced to a minimum without necessitating a reduction in width of the teeth of said ring.

The foregoing and` other objects and advantages will 'become apparent in View of the following description taken in conjunction with the drawing, wherein:

Figure 1 is a view principally in axial section of a thread-cutting tool'embodying the features of the invention;

Fig. 2 is a face View thereof; Fig. 3 is a view in section taken in a plane normal to the axis of the tool;-

Fig. 4 is a section takenv on the line ,ll-4,'

Fig. 2.

Referring in detail to the drawing, 5 designates the actuating frame or'barrel of the tool which. is provided with a handle socket' 6 adapted toV receive a handle l. Adjacent the handle is a pawl housing 8 in which a pawl assembly is mounted, said assembly comprising a pair of independently movable pawl teeth S and 9a, each of which is provided with a slot I6. These pawl teeth are mounted in a pawl housing or block II and retained against displacement by a pin I2 which passes through the slots I0. Ihe pawl teeth are depressed against springs I3. 'Ihe shank I I a of the pawl housing I I is provided with a cap or head I4 having a direction-indicating arrow on the face thereof to indicate the driving direction of the ratchet. The pawl housing II is provided with a shouldered portion which has mounted thereon a spring I 5 which serves to normally urge the entireassembly towardsv ratchet-engaging position.l Y i Mounted for free rotation in the barrel 5 is a driving ring lfiprovide'dwith teeth I'I, said ring being held in assembled relationwith respect to said barrel by means of a retainerv'ring I8. The teeth- I1 of thedriving ring I6 are practically of the straight cuttype and are relatively broad and therefore rugged and capable of withstanding relatively heavy driving strains. These teeth, however, lmay be made 'of any suitable dimensions in accordance with the Work the tool is required to perform. Byreferring to Fig. 3, it will be notedv thatthe multiple tooth construction of the pawl assembly reduces the free-running or back-lash movement of the rbarrel 5 in direct proportion to the number of teeth in the as-l sembly. In the present instance, since two teeth are provided, the back-lash or-r'ree-running of the barrel is reduced to fifty percent of what it `would normally be were the pawl of the conventional one-tooth design. This is of considerable advantage in tools of this type where it is desirable to utilize 'a single pawl assembly acting at one point onlyfon the periphery ofthe driving ring. `Furthermore, in this construction the .teeth of the pawl may be relatively rugged,

or of ample width to withstand any reasonablel work they may be called upon to perform.

Tools of the present type are usually provided with sets of die holders which range in varying sizes in accordance with work of varying diameter. One of the die holders is generally indicated at"20 vand is provided with a drive barrel 26a which is of polygonalror ilat sided 'formation to con-form to--the contour ofthe driving ring I 6 and provides a driving engagement therebetween. The driving ring I G is provided rwith an annular groove 2I in` which a split Aring 22k is inserted, said ring being adapted forv resilient engagement'in grooves 23 formed in the periph-y eral corners of the barrel 20d. These grooves preferably have tapered sides, and to save metal and lighten the tool for dies of relatively smallr upon the ring 2| is spread or sprung outwardly thereby clearing the grooves 23 and permitting the holder to be easily removed axially outwardly. To substitute another block it is only necessary to push the latter in place in an obvious manner. Among the advantages of this type of retaining means for the holders 2U are that the latter can be applied from either side of the ratchetnin an axial direction, it is not necessary vto turn the holder to any particular point in order to register with a key way when it is desired to remove the holder, as in those types of tools wherein the holder has a splined engagement with the ring; and the parts may be economically ymanufactured.

It will be obvious that "the die.A holder and die could be made integral and that other types of tools could be substituted forthethread-,Qlltng dies and also for the die holder, and other lim-j ited structural modifications adopted Without de-l parting from the Scope Ofzthe invention as defined by the appendedy olaims Y I claim: L 1. A die stock assemblyfcomprising an actuating frame, a ratchet drive ringmounted for relative rotation in said frame, pawl mechanism associated with saidframe and ring ifor rotating complementary groove, anda split springy ring p0.-`

sitioned in said grooves and serving to releasably hold lthe barrel against axialdisplacement with respect to said ring. j Y f 2. A die stock assembly comprising an actuating frame, a ratchet drive ring mounted for relative rotation in said frame, pawl mechanism associated with said frame and adapted yto inter-,- mittently engage said ring, adie holder provided with a drive barrel adapted to be inserted in said ring, saidring and barrel being provided with coacting continguous surfaces of polygonal' formas tion to provide a driving engagement ,therebetween, the peripheral surface of said barrel land the contiguous surface of said` rngbeing formed with complementary grooves, and a. split retaining ring positioned in said grooves and serving to releasably retain the holderagainst axial displacementwith respect to said ring, the end of said. barrelbeingprojected outwardly with respect to said ring tol provide a thumb-engaging portion to facilitate removal oi said holder. i

3; In a die stock, an actuating `vhandle fra-me, a' ratchet ring mounted for Yrelative rotation in said frame andY having substantially straight-cut teeth, and pawl mechanism for initiating a driving connection between the frame and said ring, said pawl mechanism including a spring-pressed housing block which is mounted for limited radial sliding movement in said frame adjacent said ring and a plurality of independently-movable springpressed pawls mounted for limited radial movement in said block and having tooth-engaging portions which face in thev same direction, said pawls being of such width and spacing as to a1- ternately mesh with each successive tooth of said une.

'4. In a die stock, an actuating handle frame, provided with a pawl housing, and pawl mechanism mounted in said housing, said pawl mechanism comprising a spring-pressed pawl housing block, a pair of independently movable pawl teeth mounted in said block and having tooth-engaging portions ,which face in the same direction, said teeth being provided with aligned openings, a retainingpin secured in the sides of the pawl block andA` extending through said openings to retain said pawls Vin said block, and a ratchet drive ring mounted in said frame and provided with substantiallystraight out teeth adapted for engagement with said pawl teeth, the width and spacing of the pawl teeth with respect to the drive ring teeth being such as to cause alternate successive meshing of the pawl teeth with the drive ring teehil l K .5;.A die stock assembly comprising: an actuatingrame, a drive ring mounted for relative rotation in said frame and having a polygonalshaped:'opening therein, means associated with said frame and ring for rotating the latter, a tool helder having a drive barrel with a polygonal shaped periphery inserted in said openingvto provide-a driving engagement with said ring, the periphery ofthe barrell beingforrned with anannular groove'having tapered cam-like side walls, and va split: spring ring positioned in a groove formed inthe inner periphery of the drive ring; and resiliently engaging Ain the groove of said barrel whereby'the latter is releasably held in the drivering.. n s

61Al die'stock assembly comprising: an actuating i:`ra`me,-a drive ring mounted. for relative rotation in said frame and having a polygonalshaped opening therein, means associated with said frame and ring for rotating the latter, a tool holder provided with a drive barrel having a polygonal contour complemental to said drive ring opening, the inner periphery ofr the drive ring being formed with an annular groove and the said barrel being formed with a complemental peripheral groove, and asplit spring ring positioned in the groove of the drive ring and releasably engaging in the groove of .the drive barrel, said latter groove having tapered cam-like side wallsI to permit thumb pressure?? removal' ofsaid barrel.

WILLIAM O. THEWES.

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