US2136121A

US2136121A - Lubricating threading tool

Info

Publication number: US2136121A
Application number: US145791A
Authority: US
Inventors: Victor B Westfall
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-06-01
Filing date: 1937-06-01
Publication date: 1938-11-08
Anticipated expiration: 1955-11-08

Description

Nov. 8, 1938. vl B. wEsTFALL LUBRICATING THREADING TOOL Filed June l, 1937 BY was, @M ATTORNEYS Patented Nov. 8, 1938 UNITED STATES naar PATENT OFFICE 5 Claims.

This invention relates generally to the art of forming and cutting screw threads, and more particularly to a hand-operated thread cutting tool such as a stock and die.

An object of the invention is to provide a thread cutting tool structurally characterized in a manner to enable lubricant to be directly applied to the die under the control of the operator in order to facilitate the thread cutting operation and to reduce wear on the die to a minimum, as well as to eliminate the present time wasting and ineicient method of applying lubricant from an oil can to the work at intervals.

Another object of the invention is to provide a stock and die, one of the handles of which is adaped to-form a lubricant reservoir, with simple and positively acting means therein by which the operator can discharge a quantity of lubricant from the reservoir onto the work as desired, by a simple manipulation of the `linger as the stock is being operated to cut threads on the work, all to the end of greatly expediting the cutting of the threads and reducing wear on the dieto a minimum.

A further object of the invention is to provide a thread cutting tool such as a stock and die in which the lubricating means-can be embodied as a permanent part of the stock during manufacture thereof, or can be applied as an attachment to a conventional stock by the removal of a handle of the stock and the substitution therefor of another handle embodying the invention.

With these and other objects in view, the invention consists of the comb-inations and arrangements of elements as set forth in the following specication and particularly pointed out in the appended claims.

In the accompanying drawing,

Figure l is a view in side elevation, showing the invention applied to a conventional form of stock and die;

Figure 2 is an enlarged fragmentary longitudinal sectional view through the body and handle of the stock and showing the invention associated therewith;

Figure 3 is a view similar to Figure 2 and showing another position occupied by the working parts of the invention;

`Figure 4 is a transverse sectional view taken on the line 4-4 of Figure 2.

Referring specically to the drawing, the invention is shown associated with a conventional form of stock S and die D for cutting threadsron pipe, although it will be clearly understood that (C1. lil-126) `this showing is solely for the purpose of illustrating one use of the invention.

The stock S is composed of the usual elongated body I0 having suitable means II for removably holding the thread cutting die D in a position to cut threads upon a pipe when the head is applied to the latter and rotated, the pipe extending into the bore I2 of the body and being guided co-axially of the die by a removably tted adapter bushing I3, all of which will be understood by those familiar with the art.

'Ihe opposite ends of the body are internally threaded to receive tubular handles I4 and I5 in the form of lengths of pipe, which provide the necessary leverage to rotate the die upon the work.

In embodying this invention in the stock and die as above described, one of the handles I4, for example, is utilized as a mounting or support and provides a lubricant reservoir I6, the inner and outer ends of which are closed by plugs I'! and I8, respectively, the former being a force fit in the bore of the handle. The plug I8 is removably tted in the handle bore and is pro-vided with an annular flange I9 maintained seated against the vouter end of the handle by a retainer 20 threadedly mounted on the handle as indicated at 2I and freely receiving the outer portion of the plug I8 so as to bear against the ilange I9.

The plug I'I is provided with a feed chamber 22 communicating with the reservoir through a cylindrical vbore 23 in the plug which constitutes an inlet from the reservoir to the chamber. The chamber is' provided with an outlet 24 normally closed by a spring pressed check valve 25 mounted in a coupling 26 connecting an elbow fitting 2'I at the outlet, with a con-duit 28 extending through an opening 29 in the body I0 into the bore I2 thereof in a direction to project a stream of lubricant against a pipe in the bore, when the lubricant is placed under pressure in the chamber.

Working in the bore 23 is a plunger 30 in the form of an open ended sleeve slidably mounted between stops 3| and 32 on the head33 of a plunger rod 34 to provide a lost motion operative connection between the plunger and rod in a direction axially thereof.r The head 33 and stop 3| are longitudinally grooved to provide by-pass channels 35 between the plunger and head, and the plunger is' beveled at its outer end to provide an annular valve seat 36 with which the beveled face 3'! of the stop 32 is adapted to co-act in closing the inlet to the chamber from the reservoir when the plunger occupies one extreme position on the head. In the other extreme position of the plunger on the head, lubricant from the reservoir I6 is free to flow through the channels 35 into the chamber 22. The seat 36 and stop 32 thus o o-act to provide a valve controlling communication between the reservoir and chamber.

The plunger rod 34 passes through the reservoir I6 and is threaded into a stem 38 and locked thereto by a nut 39. The stem is provided with a beveled stop collar and extends through ay pocket 4I in the plug I8 in which is a coil spring 42. This spring co-acts with the plug I8 and with a button 43 on the outer end of the stem 38 to normally urge the plunger and plunger rod assembly to the extreme position shown in Figure 1, denitely established by engagement of the collar 4I) with a seat 44 in the plug I8 to seal the joint between the collar and plug against the leakage of lubricant from the reservoir. A removable protecting cap is threaded on the outer end of the plug I8 to prevent accidental actuation of the button 43 when the invention is not in use.

The operation of the invention is as follows: Let it be assumed that lubricant has been supplied to the reservoir I6 following temporary removal of the plug I8 and partial withdrawal of the plunger and rod assembly from the handle i4. With the stock S applied to a pipe and then rotated to cut threads on the pipe, it will be clear that during the interval in which the handle I4 is above the horizontal lubricant will be free to ow from the reservoir through the channels 35 into the chamber 22, and to ll all unoccupied space therein and in the fitting 21 to the valve 25, as the plunger occupies the extreme position between the stops 3I and 32 wherein its seat 36 is clear of the valving face 31 of the stop 32.

When the handle I4 is at or adjacent its uppermost position, the operator presses the button 43 with the thumb of that hand grasping the handle and thereby actuates the rod 34. As the lubricant in the chamber resists this movement of the rod and plunger 36, the lost motion between the two is first taken up so as to engage the valving face 31 with the seat 36 and thus disrupt communication between the reservoir and the chamber. Further movement of the button will actuate the plunger as shown in Figure 3, to cause the latter to place the lubricant in the chamber 22 under pressure and thus eject a stream of lubricant from-the chamber past the valve 25 and from the conduit 28 onto the pipe directly in advance of and at the die D, so that upon continued rotation of the stock, the die will be lubricated as it cuts threads on the pipe.

Upon releasing the button 43, the rod 34 returns to the position shown in Figure 2 under the action of the spring 42, it being understood that the Weight of the plunger and its frictional Contact with the bore 23 permits the rod to move relatively to the plunger so as to restore the latter to its extreme position between the stops 3| and-32 wherein the seat 36 is clear of the valving face 37, Communication between the reservoir and chamber through the channels 35 is thus reestablished, so that lubricant in the reservoir will again be free to ow into the chamber to replenish the lubricant ejected therefrom.

When the handle I4 is inverted during a portion of the rotary movement of the stock on the pipe, the weight of the plunger and that of the oil in the chamber imposed on the plunger causes the latter to move relatively to the rod so as to engage the valving face 37 and thus seal 01T the chamber from the reservoir to prevent the return of the lubricant from the chamber to the reservoir. Therefore, each time the button i3 is actuated7 a stream of oil will be discharged from the chamber through the conduit 28, until the supply of lubricant in the reservoir is exhausted.

What is claimed is:

. 1. In a tool of the class described, a lubricant reservoir; a feed chamber having an inlet communicating with the reservoir, and a check valve controlled outlet through which lubricant can be discharged; a manually operable actuator having spaced stops; a plunger mounted on said actuator and having a lost motion operative connection therewith between said stops; and valve means co-acting with one of said stops and the plunger to open said inlet in one relative position of the actuator and plunger, and to close said inlet for the ejection of lubricant from the chamber by the plunger in another relative position of the actuator and plunger; and means for urging the actuator in one direction.

2. In a tool of the class described, a lubricant reservoir; a feed chamber having a check valve controlled outlet from which lubricant can be discharged; means ydeiining a bore providing an inlet to the chamber from the reservoir; a manually operable actuator having spaced stops; a tubular plunger Working in said bore and mounted on said actuator between said stops for movement from one extreme position to another; means co-acting with the plunger and one of said stops for opening said inlet in one eXtreme position of the plunger on the actuator, and for closing said inlet in the Vother extreme position of the plunger, for ejection of lubricant by the latter from the chamber through said outlet; and means for urging the actuator Yto one extreme position.

3. In a tool of the class described, a lubricant reservoir; a feed chamber having a check valve controlled outlet from which lubricant can be plunger working in said bore and mounted on 5.1

said actuator between said stops for movement from one extreme position to another; the plunger having a seat, and one of said stops having a valving face co-acting therewith to open or close said inlet accordingiy as the plunger occupies one extreme position or another on the actuator; and means for urging the actuator in a direction to open said inlet.

4. A handle for a stock and die adapted to be secured at one end to the body of the stock, the handle having a lubricant reservoir therein; means dening a feed chamber in the handle having an inlet bore and a check valve controlled outlet; an actuator mounted in the handle for manual operation and having a rod extending through the reservoir into said inlet bore; spaced stops on said rod; a tubular plunger working in said inlet bore and mounted on the rod between said stops for movement from one extreme position to another; means for opening or closing said inlet bore accordingly as the plunger occupies one extreme position or another; and means for urging the actuator in a direction to open said inlet bore.

5. A handle for a stock and die adapted to be in said inlet bore and mounted on the rod between said stops or movement from one extreme position to another; the plunger having a valve seat, and one of said stops having a valving face 4 coacting therewith to 'open or close said inlet bore accordingly as the plunger occupies one extreme position or another; and means for urging the actuator in a direction to open said inlet bore.

VICTOR B. WESTFALL.