US2855614A

US2855614A - Self-oiling die stock

Info

Publication number: US2855614A
Application number: US705027A
Authority: US
Inventors: Clarence B Simon
Original assignee: Individual
Current assignee: Individual
Priority date: 1957-12-24
Filing date: 1957-12-24
Publication date: 1958-10-14
Anticipated expiration: 1975-10-14

Description

oa. 14, 195s C. B. SIMON SELFr-OILING DIE STOCK Filed Dec. 24, 1957 1 3 0 O i 7 O0 1 j 2 j 2 i j 1... Jv" I4 A l! Y ...un M 1 3.. m y l# if. 1 NM- SELF-OILING DIE STCK Clarence B. Simon, Little Rock, Ark. Application December 24, 1957, Serial No. 705,027

6 claims. (ci. 11i- 126) This invention relates to a die stock for use in threading 'bolts and studs, and particularly to the provision or a die stock so constructed as to automatically supply a constant llow of lubricating oil to the cutting die and the work piece during the threading operation.

ln order to prolong the life of the cutting die, and also in order to obtain perfect threads, it is essential that both the die and the bolt or stud being threaded be supplied with a quantity of oil suticient to lubricate the cutting teeth of the die, cool both the die and the work piece, and aid in the removal of the metallic chips produced by the threading operation. While it is generally recognized that it would be preferable to have the lubricating oil supplied at a fairly constant rate throughout the thread-cutting operation, it is obvious that this cannot be done with a conventional die stock, which requires that the operator use both hands to turn it and, thus, makes it impossible for him to apply lubricating oil while the die stock is being operated.

The requirement that the operator interrupt the threadcutting operatic-n each time it becomes necessary to apply lubricating oil to the cutting die and the work piece is, perhaps, the principal disadvantage of the conventional die stock. In actual practice, it has been found that, during these interruptions, the operator normally applies too much oil to the cutting die and work piece, but nevertheless nds that, by the time he has wiped his hands and resumed the threading operation, there is not enough oil remaining at the point where it is needed, the bulk of it having run E or dripped onto nearby pieces of machinery and equipment, possibly damaging the same, or even onto the oor, thereby creating safety hazards.

A second major disadvantage of the conventional twohanded die stock arises out of the requirement that the operator shift the position of his hands with each 180 turn of the die stock. This constant shifting of the operators hands results in a large number of ileeting interruptions of the threading operation which, when added to the time consumed by the interruptions required for the purpose of lubricating the cutting die and the work piece, substantially increase the length of time required to complete'each individual piece of Work.

Another disadvantage of the conventional die stock is that aws and inaccuracies in the finished threads sometimes result from the repeated interruptions and resumptions of the threading operation which must be made to enable the operator to lubricate the cutting die, and also to shift the position of his hands to turn the die stock.

It is therefore, the primary purpose of the present invention to provide a die stock having a self-contained reservoir from which lubricating oil is automatically supplied to the cutting die and work piece at a relatively constant rate while the threading operation is in progress, but without requiring any elort or regulatory action on the part of the operator, thus enabling him to complete an entire thread-cutting operation without any interruption for lubricating purposes.

vUnited States Patent O Patented Oct. 14, 1958 A related purpose is to provide a die stock having a reservoir from which the lubricating oil will not drip, flow or leak when the die stock is not in operation.

Another object is the provision of a die stock which the operator is not required to turn with his hands, but which is adapted to be rotated by a standard mechanics wrench or drive ratchet, thus eliminating the interruptions occasioned by the constant shifting of operators hands and making it possible to complete an entire threadcutting operation from start to finish without any interruptions whatever.

A further object is to provide a die stock which, by virtue of its size and compactness, is adapted to be used for threading bolts and studs located in relatively inaccessible positions.

A final object is the provision of a die stock which accomplishes all of the foregoing objects, yet is simple in construction, easy to operate, and relatively inexpensive to manufacture.

These objects are realized by the die stock embodying my invention, a preferred embodiment of which is shown in the drawings, wherein:

Figure l is an elevational view of the die stock, in cross section;

Figure 2 is a bottom plan view showing the cutting die locked in position in the die stock;

Figure 3 is a sectional view along line 3 3 of Figure l; and

Figure 4 is an elevational view of the die stock in operation, showing a bolt partly threaded.

As shown in Figure l of the drawings, the preferred embodiment of my invention consists of a cylindrical tubular body 10, provided with a tapered head -portion 11 having a socket type opening 12 adapted to be engaged by a conventional drive ratchet or electric wrench. The internal face 13 of tapered head portion 11 provides a flat seating surface for a rubber liller tube or oil seal ring 14.

Located in the base of tubular body 10 is a screw 15, adapted toengage a conventional thread-cutting die 16 and maintain it in locked position in the base portion of tubular body 10. By disengaging screw 15, die 16 may, of course, be removed and replaced.

Also removably positioned within tubular body 10 are a rigid diaphragm 17 having a slot 18 centrally located therein, two

porous rubber inserts

19 and 20, the rubber in which may be any one of several well known oilresisting types, and a coiled spring 21, positioned between inserts 19 and 2li.

Before beginning the thread-cutting operation,

rubber inserts

19 and 20 are saturated with lubricating oil, supplied through the openings in the opposite ends of tubular body 10, after which diaphragm 17 and cutting die 16 are locked into position by tightening screw 15. A conventional mechanics wrench or drive ratchet 22 is then inserted into the socket opening 12 of the tapered head portion 11 of tubular body 10, the cutting die 16 positioned on the bolt 23 to be threaded, and the die stock rotated by mechanics wrench or ratchet 22 until the threading operation is complete.

lt will be seen that, as the threaded portion of bolt Z3 emerges from the teeth of cutting die 16, it forces diaphragm 17 progressively inwardly against rubber insert 19, thereby compressing said insert and causing a portion of the oil contained therein to be released and supplied, through slot 18 and around the edges of diaphragm 17 to the teeth of cutting die 16 and the threads of bolt 23. The increasing pressure exerted by bolt 23 against rubber insert 19 also overcomes, to some extent, the outward force exerted by coil spring 21, thereby tending to compress it inwardly against rubber insert 20, which is compressed in turn against oil seal ring 14, with the result that a quantity of the oil contained in insert Ztl is also released and added to the supply of oil being ted through insert 19 and slot 18 in diaphragm 17 to cutting die 16 and work piece 23. The oil thus released from insert 2? is Vprevented from escaping through the opening 12 in the head portion 11 of tubular body il@ by virtue of the seal effected by the interaction of 'rubber ring 14 and wrench or ratchet 22.

It will Vbe apparent from the foregoing description that a relatively constant flow of oil is supplied to the cutting die 16 and work piece 23 throughout the threading operation, and that this is attributable to the fact that a progressively increasing forceV is being exerted on porous

rubber oil reservoirs

19 and 20 while the amount of oil contained in said reservoirs is progressively decreasing. By utilizing this interrelationship between the increased force being exerted on the porous rubber reservoirs and the diminishing supply of lubricating oil contained, so as to release the oil at a relatively constant rate, the die stock herein described eliminates the disadvantages heretofore encountered in manually supplying lubricating oil and relieves the operator of any responsibility for attending to'that particular phase of the threading operation.

Applicants invention not only provides an eminently satisfactory solution to the problem of automatically supplying a constant flow of lubricating oil to the thread-cutting die and work piece, but also results in the elimination of any ilaws or inaccuracies caused by repeated interruptions and resumptions of the threading operation, a substantial reduction of the time required for the threading of any given work piece, and the complete elimination of the time formerly required to be spent in cleaning the cutting die, die stock, work piece and surrounding machinery and equipment of excess oil manually supplied by the operator of a conventional die stock. t

Having thus described my invention, what l claim as new and desire to obtain by United States Letters Patent is:

l. A self-oiling die stock consisting of a cylinder having means for engaging and holding a thread-cutting die in locked position in its base portion; means adapted to receive a tool for rotating said cylinder in its head portion; and automatic oiling means positioned within said cylinder, comprising a porous resilient insert of an oil-resisting material, and a rigid slotted diaphragm adapted to be forced longitudinally inward against said insert by the operation of said die stock.

2` A self-oiling die stock consisting of a cylinder having means for engaging and holding a thread-cutting die in locked position in its base portion; means adapted to receive a tool for rotating. said cylinder in its head portion; and automatic oiling means positioned within said cylinder, comprising a porous resilient insert of an oilresisting material, interposed between spring means and a rigid slotted diaphragm adapted to be forced longitudinally inward against said insert by the operation of said die stock.

3. A self-oiling die stock consisting of a cylinder having means for engaging and holding a thread-cutting die in locked position in its base portion; means adapted to receive a tool for rotating said cylinder in its head portion; and automatic oiling means positioned within said cylinder, comprisingra pair of porous resilient inserts ot an oil-resisting material, spring means interposed between said inserts, and a rigid slotted diaphragm adapted to be forced progressively inward against one of said' inserts as the threading operation proceeds.

4. A self-oiling die stock consisting of a cylinder having means for engaging and holding a thread-cutting die in locked position in its base portion; a tapered head portion provided with means adapted to receive a tool for rotating said cylinder; and automatic oiling means positioned within said cylinder, comprising a plurality of porous resilient inserts of an oil-resisting material, and a rigid slotted diaphragm adapted to be forced progressively inward against one of said inserts as the threading operation proceeds.

5. A self-oiling die stock consisting of a cylinder having means for engaging and holding a thread-cutting die in locked position in its base portion; a tapered head portion provided with means adapted to receive a tool for rotating said cylinder; and automatic oiling means positioned Within said cylinder, comprising a rigid diaphragm having a slot therein, adapted to be forced longitudinally inward within said cylinder during a threading operation, a porous rubber insert abutting said diaphragm, and spring means interposed between said rubber insert and the tapered head portion of said cylinder, whereby said insert is compressed outwardly against said diaphragm during a threading operation.

6. A self-oiling die stock consisting of a cylinder having means for engaging and holding a thread-cutting die in locked position in its base portion; a tapered head portion provided with means adapted to receive a tool for rotating said cylinder; and automatic oiling means positioned within said cylinder, comprising a rigid diaphragm having a slot therein, adapted to be forced longitudinally inward within said cylinder during a threading operation, a first porous rubber insert abutting said diaphragm, a second porous rubber insert disposed adjacent the head portion of said cylinder, and spring means interposed between said first and second rubber inserts, whereby said first insert is compressed outwardly against said diaphragm and said second insert is compressed outwardly toward said head portion during a threading operation.

No references cited,