US1161586A - Ejector for thread-rolling machines. - Google Patents

Description

c. AXMACHER, T. A. GORMAN & I. HART.

EIECTOR FOR THREAD ROLLING MACHINES.

APPLICATION FILED APR.29, I9I5.

Patented; NW. 25, 1915.

2 SHEETS-SHEET I.

mvEmTonS WITNESSES C. AXMACHER, T. A. GORIVIAN & I. HART.

EIECTOR FOR THREAD ROLLING MACHINES.

APPLICATION FILED APR. 29. I9I5. 1.161586. liiflilftd Nov. 1915.

2 SHEETS-SHEET 2.

WITNESSES IEWENTORS Wzzfi UNTTFED STTES PATEEN @FFICE.

CHRIST AXMACHEB, THOMAS A. GOBMAN, AND JAMES HABIT, OF JOHNSTOWN, PENNSYLVANIA,

EJECIOE FOR THREAD-ROLLING MACHINES.

Application filed Apri129, 1915.

T 0 all whom it may concern:

Be'it known that we, Cinns'r Axamcrrns, THOMAS A. GORMAN, and James HART, all citizens of the United States, and residing at Johnstown, in the county of Cambria and State of Pennsylvania, have invented certain new and useful Improvements in Ejectors for Thread-Rolling Machines, of which the following is a specification.

Our invention relates to machines by which helical threads are rolled upon the ends of cylindrical bolts or rods. In the use of such machines it frequently happens that the bolt or rod on which a thread has just been rolled will stick and remain in position between the dies of the thread rolling machine. \Vhen the thread rolling dies do not clear the threaded bolt at the end of the stroke of a thread rolling operation, the bolt is drawn backwardly between the threading dies by the backward movement of the reciprocating threading die, with the result of deforming and distorting the rolled thread on the end of such bolt.

One object of our invention is to provide a bolt ejector of novel construction having means whereby the bolts or rods are ejected from between the threading dies at the completion of each thread forming stroke of the thread rolling machine and sticking of the threaded bolts or rods between the dies with the consequent forming of defectively threaded bolts will be prevented and overcome.

Other objects of the invention will become apparent as will be more fully described hereinafter and be specifically pointed out in the appended claims' Referring now to the drawings forming a part of this specification, Figure 1 is a plan of a thread rolling machine having a bolt ejector constructed and arranged and ap plied thereto in accordance with our invention, the ejector being shown in its retracted or inoperative position. Fig. 2 is a plan of the front or die end of the thread rolling machine of Fig. 1, showing the ejector in bolt ejecting position. Fig. 3 is a longitudinal side elevation showing the front or die end of the machine and the ejector forming this invention. Fig. 4 is an end elevation of the die threading machine of the preceding figures, with the ejector shown as ap plied thereto in accordance with Our invention. Fig. 5 is a detail sectional elevation Specification of Letters Patent.

Patented Nov. 23, 1915.

Serial No. 24,811.

showing the construction of the ejector mechanism forming this invention.

In the accompanying drawings, the numeral 2 designates the base or frame of a threadrolling machine, having a die holder 3 with a stationary die removably secured therein and having a cross head slide 5 with the reciprocating cross head (i mounted therein. The reciprocatory cross head 6 is provided with reciprocating die 7 removably secured thereon, the thread rolling face 8 of the die 3 being arranged opposite the thread rolling face 9 of the die 7. Thecross head 6 is connected by a pitman or connecting rod 10 to a crank pin 11 on the spur gear 12 which is mounted on a shaft secured in the bearing H forming part of the frame 2 of the thread rolling machine.

The spur gear 12 meshes with the spur pinion 15 on one end of the counter shaft 16, this shaft being mounted in the bearing 17 forming part of the frame 2. The 0pposite end of the shaft 16 is provided with a spur gear 18 which meshes with a spur pinion l9 on the overhanging end of the pulley shaft 20. The shaft 20 is provided with a pulley 21 which is secured to the spur pinion 19 either directly or through the shaft 20 so as to positively rotate the spur gear 19. The pulley 21 is connected by a bolt (not shown) with a motor driven line shaft or driving motor.

The belt threading machine, in itself, not forming part of our invention, its construction is not described in detail.

Rigidly secured on the top face of the cross head bearing 5 by bolts 22, 22, is a bracket bearing 23, and mounted in this bearing is a vertically extending shaft 24. The shaft 2% is provided with a squared lower end 25 and opposite sides of the squared end 25 are provided with transversely extending recesses or grooves 26 and 27. The shaft 24 is adapted to turn in the bearing 23 and is held in position by means of a set collar 28, this collar having a set-screw The upper end of the shaft 24 is provided with a transversely extending slot or groove 30 and secured on the cylindrical upper end of the shaft is a helically spring 31. The upper end 32 of this spring 31 is bent to extend into or through the transverse groove 30 and the opposite end 33 of the spring 31 is bent so as to project downwardly into an opening hole 34 in the flange of the bracket bearing 23. Secured in the transverse recess 27 in the squared end of the shaft 2& is a. downwardly and also outwardly curved ejector arm 3% which has a hook on its outer end forming a bolt engaging-lug or shoulder thereon. Secured in the other transverse recess 26 in the squared end of the shaft 24 is a horizontally extending ielding spring arm 36.- The outer end of? this arm is bent or inclined, the inclined portion 37 being adapted to engage or be engaged by the oppositely inclined end 38 of the trigger 39, the trigger being adjustably secured by bolts 40 to one side of the reciprocating cross head 38, so as to bring the trigger into proper striking engagement with the end 37 of the swinging spring arm 36.

In. the operation of threading machines equipped with our improved ejector, the threads are rolled on the bolts or rods by the opposing facesS and 9 otthe threading dies 4: and 7, the die 7 reciprocating forwardly and backwa'rdly in front of the die 4 in the usual known manner. Suitable dies having been positioned on the thread rolling machine the cross head 6 is advanced until the dies 4 and 7 are in the relative position shown in Fig. 2. The trigger 39 is then adjusted and secured on the cross head (5 in position as shown in Fig. As the reciprocating cross head (3, which carries the reciprocating die '7, moves forwardly and the rear end of the die 7 reaches the end of its forward movement position, adjacent to the front end of the die 4, the inclined end 38 of the trigger 39 engages with the inclined face 37 of the spring arm 36 and further movement of the cross head (5 causes the arm 36 to swing and turn the shaft 24 against the opposingact-ion of the spring 31. This movement of the shaft Ql swings the ejector arm 34 into engagement with the bolt or rod between the dies, a short time before the rear end of the reciprocating die travels past the front end of the stationary die 4.. Engagement with the bolt prevents further swinging move ment of the arm 13% and causes the yielding arm 36 to spring or bend as; the movement of the cross head continues in a forward direction. ilhen the lics reach the position shown in Fig. 2, the bolt on rpd on which the thread has been rolled is clear of these dies and the spring action ofjthe yielding arm 36 will forcibly eject the bolt which now is in engagement with the oute'r end of the ejector arm 3ft. (in the return or backward stroke of the reciprmrating cross head, the spring 31 on the. shaft 24- actsto return the ejector arn 25i into its retracted position shown in be above described operations are then 'repeated with the successive bolts or' rods.

The advantages of our invention will be apparent to those skilled in the art. By the ejecting provision of our improved ejector mechanism the bolts are forced from between the threading dies of the threading machine at the completion of each thread rolling operation. The apparatus is simple and is easily kept in repair. The ejector mechanism is mechanically actuated. so that the attention of workman is unnecessary. By its use the number of defectively threaded bolts and rods is greatly lessened and damage to the threads by reason of sticking is entirely overcome.

Modifications in the construction and arrangement of the parts may be made Without departing from our invention as defined in the appended claims.

ll'e claim l. A bolt ejector for thread rolling ma- 3. A bolt ejector fo'r thread rolling machines comprising a reciprocating cross head, a yielding bolt ejecting mechanism movably mounted on said machine, said mechanism being adapted to"move into bolt position prior to the completion of the thread rolling, operation, and means on the cross'head of said thread rolling machine engaging withand actuating said ejecting mechanism, to thereby engage and eject bolts between the dies of said machine at the completion of the thread rolling operation.

4. A bolt ejector for thread rolling machines comprising a reciprocating crosshead, a yielding bolt ejecting mechanism movably mounted on said machine, said mechanism being adapted to move into. bolt ejecting the thriad rolling operation, means on the cross head of said thread rolling machine engaging with and actuating said e'ecting mechanism, to thereby en age and" eject bolts between the dies of said machine at the completion of the thread rolling operation, and yielding means for returning said eject ingmechanism into position to engage with a succeeding bolt between the dies of said machine.

5. A bolt ejector for thread rolling machines comprising a reciprocating crosshead, a swinging arm movable into and out position prior to the completion of.

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of bolt ejecting position, a yielding arm connected to and arranged to move said swinging arm into bolt ejecting position, and a-trigger on the reciprocating cross head of the thread rolling machine arranged to actuate said yielding arm at the end of the thread rolling operation to thereby move said swinging arm into bolt ejecting position.

6. A bolt ejector for thread rolling machines comprising a reciprocating crosshead, a swinging arm movable into and out of bolt ejecting position, a yielding arm connected to and arranged to move said swinging arm into bolt ejecting position, a trigger on the reciprocating cross head of the thread rolling machine arranged to actuate said yielding arm at the end of the thread rolling operation, to thereby move and hold said swinging arm in bolt ejecting position, and a spring forming means for retracting said arms at the completion of the bolt ejecting movement thereof.

7. A bolt ejector for thread rolling machines, comprising a reciprocating cross-- head, a swinging-arm arranged to eject bolts held between the. threading dies, yielding means for holding said swinging arm in retracted position, a spring arm for actuating said swinging arm, and a trigger on the reciprocating cross-head of said threading machine arranged to engage the spring arm and more said swinging arm into bolt ejecting position at the completion of the thread rolling operation. v

8. A bolt ejector for thread rolling machines, comprising a reciprocating cross head, a swinging arm, a shaft bearing on said machine, a pivot shaft in said bearing to which said swinging arm is secured, a spring on said shaft to hold the swinging arm in retracted position, a shaft actuating arm on said shaft and a trigger on the reciprocating cross head of said machine, said trigger being arranged to engage the shaft actuating arm and move the ejector arm into bolt ejecting position.

CHRIST AXMACHER. THOMAS A. GORMAN. JAMES HART.

Witnesses:

W. MlLT. BROWN, H. W. SMITH.

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