US2316117A - Chuck for rotating and advancing tubing or other material - Google Patents

Description

April 6, 1943. E. F. TILLEY 2,316,117

CHUCK FOR ROTATING AND ADVANCING TUBING OR OTHER MATERIAL Filed Feb.- 11, 1941 2 Sheets-Sheet 1 1 Fig.1

O0 OO INVENTOR.

mm: 1. Elle,

April 6, 1943. E. F. TILLEY 2,316,117

CHUCK FOR ROTATING AND ADVANCING TUBING OR OTHER MATERIAL Filed Feb. 11, 1941 2 Sheets-Sheet 2 Z5 z? I \y I INVENTOR v lia na imli'fl 'll BY m2 91%,

Patented Apr. 6, 1943 UNITED STATES PATENT OFFICE CHUCK FOR- ROTATING AND ADVAN CIN G TUBING OR OTHER MATERIAL 1 Claim.

The invention herein disclosed relates to mechanism for rotating and advancing tubular or other forms of stock and is a continuation in part of copending patent application Ser. No. 209,185 filed May 21, 1938, Patent 2,251,642 of Aug. 5, 1941.

Objects of the invention are to provide simple, practical means which will grip the stock firm enough for both rotating and feeding it axially, without crushing or otherwise injuring or impairing 1t; to enable the regulation of the turning movement in respect to the axial feed or conversely, the feed in respect to the rotation; to avoid strain or wear of parts and to compensate readily for such wear as may occur; to enable ready adjustments to compensate for variations in size of stock and in general to provide an efficient device of the character outlined, of compact design and consisting of but relatively few, sturdy parts, well capable of carrying the loads imposed upon them.

The foregoing and other desirable objects are attained by novel features of construction, combinations and relations of parts as hereinafter described, illustrated in the accompanying drawings and broadly covered in the claim.

The drawings illustrate one commercial embodiment of the invention and certain modifications. The structure however may be further modified and changed all within the true intent and scope of the invention as hereinafter defined and claimed.

Fig. 1 is a broken and partly sectional top plan view of one embodiment of the invention.

Fig. 2 is a broken part sectional front view of the stock rotating and advancing mechanism.

Fig. 3 is an enlarged broken sectional view as on substantially the plane of line 3-3 of Fig. 2.

Fig. 4 is a sectional detail as on line 4--4 of Fig. 3.

Fig. 5 is a fragmentary sectional view of a modified form of combined worm gear and stock feeding roll.

Fig. 6 is a broken sectional view illustrating one form of change speed gearing for driving the stock feed rolls at different selected speeds.

Fig. 7 is a broken sectional detail of a form of anti-friction thrust bearing for the worm drive shafts.

The machine illustrated is in the nature of a special chuck having stock gripping jaws in the form of rolls on axes at ri angles t0 the axis of the stock and driven, in the rotation of the chuck at such speed as to advance the work at a desired rate in proportion to the speed of rotaengaging bevel pinions H, on the outer ends of radial shafts 18, carrying worms l9, at the inner ends driving work engaging worm gears 20.

For the purpose of gripping the tubing or other stock 2|, the worm gears may be cut with a relatively sharp screw thread, which to some extent, will bite into the surface of the work.

To determine the extent of such bite or grip on the stock, the worm gears may be mounted in radially adjustable relation, as indicated particularly in Fig. 4, by mounting them on spindles 22, located in the slots 23, in the projecting brackets 24, on the face of the rigid retaining ring l5, said spindles being adjusted and secured in the desired relation by the set screws 25.

The brackets 24, are shown as radially slotted at 26, to receive, guide and brace the worm gears, the latter being rotatably engaged on the spindles 22, and slidable in the slots 26, in the radial adjustment of the spindles required to set the gears in proper gripping engagement with the work,

Three of the work engaging worm gears are shown Fig. 2, spaced equi-distantly about the chuck center. These afford a good grip on the work and distribute the pressure so uniformly that the maximum pressure needed may be applied without crushing or otherwise injuring even a thin walled tubing. It is contemplated however, that a greater or a less number of these work feeding gears may be employed if found or considered desirable.

The main or supporting gear ID, and the relatively rotatable ring gear I4, carried thereby, are shown as separately driven by spur gears 21, 28, on a shaft 29, which as indicated in Fig. 1, may be operated by a pulley or other drive element 30.

By proper selection of the gear ratios, the worm gears 20, carried by the main gear ID, will be rotated from the ring gear 14, at a speed to advance the work through the chuck at a rate proportioned as desired in relation to the speed of chuck rotation, as for example, to wind on a strip of finning material at a certain helical pitch angle, as disclosed in the parent case Ser. No. 209,185, Patent 2,251,642.

If desired, the two sets of drive gearing, that is,

to the main gear or head of the chuck and to the worm gears may be made readily changeable, so as to meet various requirements.

In place of drive gearing of different ratios, '3

change speed gear sets of the constantly variable type may be employed. Thus as shown in Fig. 6, a continuously variable gear set of the Reeve or other type now on the market may be used at 3|, interposed between the drive 32, from the motor or power source and the sprocket gear drive 33, to gear 28, which in this instance, is loosely mounted on the shaft 29, which drives the chuck head. Thus by means of the speed control member at 34, the worm gears 20, may be driven faster or slower, or, be caused to dwell or even to rotate in reverse direction.

The worm gears, in their character as chuck jaws, are set to grip the stock sufiiciently to rotate the same against the pull of winding on a fin strip, or performing other work and hence the end thrust on the worms I 9, at times may be quite heavy. To take care of these thrust loads, the

'worms I 9, may be backed up with anti-friction thrust bearings, such as shown at 35, Fig. 7.

AS an aid to gripping the stock for rotating purposes, one or more or all the worm gears may be grooved peripherally as indicated at 36, in Fig. 5, to provide the effectof separated'arcuate teeth, such as 31, 38, 39, 40, cross threaded at 4|, to match the worm.

While ordinarily it may be preferred to have the concavity of the worm gear substantially match the curvature of the tubing or other stock, substantially as indicated in Fig. 4, this may not be essential and particularly so when the rolls are grooved as in Fig. 5, for in such case, different ones of the separated toothed portions 31, 38, etc.. may coact sumciently with stock of widely different diameters represented at 42. The rotation of the worm gears presents continuously fresh gripping faces to the work. These gripping faces may be shaped as indicated in Fig. 2, with three equal-distantly spaced rolls to substantially completely surround the work. Hence a relatively light pressure may ordinarily be sufficient for gripping purposes. The side walls of the brackets in which the radially disposed rolls are mounted brace the rolls in this relation, enabling them to turnwithout binding or other objectionable reactions.

The retainer ring l5, which holds the ring gear M, in place and which carries the chuck feed rolls 20, and drive connections thereto, is shown as removably bolted at 43, on a shouldered portion 44, of the chuck head, where it is firmly located but readily removed at any time. This unit mounting of the rolls and drive mechanism enables a complete interchange of parts by simple substitution of one such unit for another.

The passage through the rotating chuck head may be of a size to act as a rotary guide for directing the stock centrally to the stock gripping and advancing rolls.

What is claimed is:

A chuck for rotating and advancing tubing, comprising a main gear having a tubular hub extending from one face and having stepped shoulders of different diameters at the opposite face of the same, a ring gear rotatably seated 011 the shoulder of largest diameter and having gear teeth at the rim of the same by which it may be driven independently of the driving of the main gear, a retainer ring rigidly seated on the shoulder of lesser diameter and extending radially outwardly in overlapping relation over the ring gear, to thereby rotatably confine said ring gear in seated relation on the main gear, three rigid brackets projecting in equidistantly spaced relation from the face of said retainer ring, said brackets having radially disposed slots therein, radial shafts joumalled in said brackets in back of the radial slots in said brackets, bevel pinions on the outer ends of said radial shafts, bevel gear teeth on the face of said ring gear in mesh with said bevel pinions, worms on the inner ends of said radial shafts, three equidistantly spaced concavely toothed radially disposed worm gears in the slots in said brackets and in mesh with said worms at the back of said slots, spindles on which said worm gears are rotatably mounted. said brackets having radially extending slots receiving opposite end portions of said spindles and thrust screws adjustable inwardly in said brackets to apply positive pressure to the opposite end portions of the spindles engaged in said slots for positively locating the inner rim portions of the worm gears in position to center and to positively grip tubing extending through the tubular hub of the main gear.

EDWIN F. TILLEY.

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