US1512892A - Pneumatic hammer - Google Patents

Description

W. H. WINEMAN PNEUMATIC HAMMER Filed Oct. 26, 191B 43 E invasivi-05". ww dell waineiuam Patented @et 2l, 1924.

NETE@ STATES pensee amaai" carica..

WADE H. WINEIVIAN, OIF CHICAGO, ILLINOIS,` ASSIGNOR TO SULLIVAN :MACHINERY COMPANY, A CORPORATICN OF MASSACHUSETTS.

PNEUMATIC Application filed October 2G, Y1918. Serial N'o; 259,789.

To all whom 'it may] concern.'

y Be it known that I, lVADn H. VINEMAN, a citizen of the United Sta-tes, residing' at Chicagdinthe county of Cook and State 5 of Illinois, have invented certain new and useful Improvements in Pneumatic Hammers, of which the following is a full, clear, and exact specification. f

This invention relates to pneumatic'hammers, and more particularly to the pneumatic hammers used in drill sharpeners for operating the upper swaging die, the object of the present invention being to provide a means for controlling the hammer and a mechanism operably attached to the ha1n mer controlling means for normally holding the upper swaging die in an elevated position. In aftypeof drill Sharpener now eX- tensively used, the swaging dies are placed substantially in alinement with the upsetting mechanism, necessitating the holding of the upper die in an elevated position to permit a clearance between the dies so that the upsetting mechanism is readily accessible to F the operator. It is one of the objects of this invention to provide an automatically acting mechanism for retaining` the dies separated so that while working the steel the operator may change from the swaging to the upsetting operation without having to perform the intermediate operation of separating the dies and insertingsome means for holding the dies separated. These and other objects and advantages of my improved construction will hereinafter more fully appear.

-in the accompanyng drawings, I have for purposes of illustration shown one embodiment which my vinvention mav assume in practice.

In these drawings,-

Fig. 1 is a -front elevation of a drill sharpener embodying my invention.

Fig. 2 is a side elevation of the die operating mech-anism. Y Y

Fig. 3 is a longitiudinal sectional vview of the inlet valve.

Fig. i is an enlarged end View of the upper rockshaft and the controlling means attached thereto.

Fig. 5 is a vertical central section through the cylinder and valve mechanism of the die operating motor. f

Referring to the drawing `and to the Inachine shown therein, while the invention may be embodied in machines and devices other than the specific type herein shown, for the sake of illustration there is shown one embodiment of thefinvention in a drill Sharpener 1, having a base 2 on which is secured a lower swaging die 3. Bolted to the base at l is an upright support 5 for supporting in a vertical position a pneumatic hammer 6 for operating the upper swaging die 7.

The upperfswaging die 7 reciprocates in a vertical guide 8 formed integral with the support 5.

A ootflever 9 is attached to one end of a the other end of the rocker shaft carrying a lever 11 for actuating a vertically disposed-A rod 12 which controls a rvalve mechanism and a die holding mechanism in a manner to be hereinafter/described. A spring 18 `is held under partial compression between a flange on the support 5 and a collar on the valve rod, tonormally hold the valve -rodV in an elevated position. y

The upper swaging die is reciprocated by a piston rod 14 carried on the lower end of a piston, adapted to reciprocate in a cylinder 15 of a `pneumatic hammer 6. A valve chamber 16 is'mounted on the side of the hammer 6k and encloses a valve for directing the flow .of pressure uid alternately to the opposite ends of the piston in a manner well known in theart.

The flow of pressure fluid 'from any suit,- able source, as a pressure tank, througha pipe 17 to the valve chamber' 16,*is controlled by a normally closed valve mounted adjacent the valve chamber. This valve.

comprises a. casing 18 provided with internally threaded, oppositely disposed portions 19 whereby the same may be connected to the pipe 17 and to a short pipe 20 leading to thev valve chamber 16. A partition 21 divides the valve casing 18 into two substantially equal parts and carries substantially centrallyr of the casing a valve seat-22. A projection 23 is cast on the lower side of the casing 18 and ,is provided with external threads, or other suitable means, whereby a rockerfshaftV 10, passing through the base 2,

boss 24 is secured in alinement therewith.

Also mounted on theyvalve casing 18, but diametrically opposite the externally threaded projection A3, is an internally threaded collar 25 adapted to receive a screw plugk 26 provided with a cylindrical recess l27 passing part way through the plug and openingV into the valve chamber. Holes are provided cent-rally of the members 23 and 24 and in alinenient with the valve seat 22 and recess 27 to receive a valve pin 28 and a valve actuating rod 29, the latter being provided with a head 30 adapted to contact with the valve pin 28. n A valve member 31 is mounted on the valve pin near the upper end thereof and is normally held in contact with the valve seat 22 by a spring 32 which abuts against the valve member andscrew plug 26 and which is held in position by the upper end of the valve Vpin which passes centrally through the spring.

Journaled in bearings secured to the supportV 5 is asecond rock shaft 33 provided at one end with an arm 34 operatively connectled by means of a lost motion connection 35 with the valve controlled rod 12 through a link' 36, the rock shaft vbeing further provided kat its other end with an eccentrically mounted pin 37, carrying one end of the valve actuating rod 29. As shown, this rod 29 is made in two parts, the upper part being threaded into the lower and being held against relative movement therewith by a lock nut 29. This construction permits of an adjustment in the length of the rod so that the different members may be adjusted to preserve their proper relation and to permit the valve to seat. f

Intermediate the ends of the rock shaft and rigidly secured thereto is a dog or pawl 38 adapted to rest in a depression in the upper die r7 in such a manner that it holds the die against downward movement. The weight of the -valve actuating rod 29 normally tends to rotate the rock shaft counterclockwise to bring the pawl against the swaging die soit will fall into vthe depression formed therein. The lost motion connect-ion permits the rocker shaft to rotate independently of the valve control rod 12, so that when the swaging die moves upwardly and strikes the pawl thev rocker shaft will rotate sufficiently to permit the pawl to slide over the edge of the die and fall into the depression, as has .been described. A third rocker shaft 39 rotatably mounted in a projection 40 formed on ythe hammer or its support, is actuated by an arm ,41 rigidly connected to the shaft and Vconnected by a pin to the upper end .of the control rod 12. The other end of this rocker shaft carries a lever 42 in which is a depressionfor receiving one end of a pin 43 which passes upward through the lower head of the valve chest 16. Then the rod 12 is raised, this pin 43 forces the hainmer controlling valve in the valve chest 16 intoitsextrenie raised position, so as to direct a flow of pressure fluid tothe under side of the piston to force the piston upward and temporarily hold itelevated.

When the operator kdesires to use the swaging mechanism, he depresses the foot lever 9 which operates thecontrol rod 12 and causes the link to rotate the rocker shaft 33 in a clockwise direction and so frees the upper die by raising the pawl from con# tact therewith and also opens the valve 18 yto permit a flow of pressure fluid to the hammer to actuate the piston. The downward movement of the control rod rotates the rocker shaft in a clockwise direction to permit the pin 43 to fall so that the valve in the chest 16 can perform its normal functions. Y

1IWhen the o ei'atorieiiioves his foot from the lever 9, t e control rod is forced upward, the lost motion connection breaks the control on the rocker shaft 33, which rotates counter-clockwise under the weight of the valve actuating rod 29, and so brings therpawl 38 into the path of the reciprocatnature that several eventsoccur in a specific time relation. Let it be assumed that rthe hammer has been operating, that the pawl'38 is moved out of the path of the die7, that the plunger'43 is moved beyond the path of travel of the distributing valve in the valve chest 16, and that the valve 31 is unseated. Thesequence of events in stopping the hammer will be as follows: As the operators foot is removed from the pedalV 9 yand the rod 12 moves upwardly, Ythe member 42 forces the plunger 43 intoV engagement .with the valve and so discontinues the reciprocation of the piston'which operates the die 7 and brings the die to raised position. As this is accomplished, the pawl 38 which has been released drops into the notch in the side of the die 7, which it can read-ily do by reason of the raised position of the die, and simultaneously the valve 31 finally cuts off pressure supply yand so closes down the hammer. It will be .IiOed from Eig, 4, in which the position of Vthe parts is that ,corresponding to a time when the pawl Yisheld out of the notch in the die 7 and when the hammer is operating, that the pin 37, which determines the position of the valve 31 by means of theV plungers 29 and 28, is nearly in line between the axis of the rock shaft 33 and the valve 31. It will therefore be noted that, as the arm 34 moves upwardly, the valve 31 will be closed at first only very gradually and that accordingly while there will be throttling of the supply of air to llHl lUS

lli)

ythe top of the die 7 With the member A38 Willy cause a momentary reopening of the valve 3l whereby to effect the` admission of a final small quantity of fluid to carry through the upwardfmotion of the piston and die `7 withoutreleasing the distributing valve fromiit's raised position. Thus 1t 1s seen that I have devised a simple and efficient means for noi'- mally retaining the upper syvaging vdiein an elevated position, and means :tor casus-ry ing the die holding mechanism to operate when the fluid pressure is cut ofi from the pneumatic hammer which operates the die.

While I have herein shown and described, for the purpose of. illustration, one specific form of the invention, it is to be understood that the same has been shown for illustrative purposes only and that extensive deviations may be made from the disclosed form thereof Without departing from the spirit of the invention.

Vilhat I claim as new and desire to secure by Letters Patent is:

1. In a drill sharpener, the combination with swaging means comprising stationary and movable dies and a fluid pressure motor for actuatingsaid movable die, of controlling means for said motor operative to cause raising of said die prior to the shutting down of said motor, and automatic mechanical means adapted to engage said de and hold itin raised position, said controlling means being operative to entirely discontinue supply oit' fluid pressure to said motor when said die is held stationary in raised position.

2. In a drill Sharpener, the combination with swaging means comprising stationary and movable dies and a fluid pressure motor for actuating said movable die, of control means for said Sharpener comprising a valve adapted to control the supply of pressure fluid to said motor, mechanical means normally extending into the path of said movable die and operative when so extended to hold said die in raised position, and control mechanism ior said valve and said mechanical means operative in one position to open said valve and Withdraw said holding means and in another position to permit said holding means to extend into the path of said movable die and said valve to close, said control mechanism including a mechanical interconnection whereby said valve may be momentarily opened upon engagement of said holding means by said die upon upward movement of the latter.

3. In a drill Sharpener, the combination of swaging means comprising stationary and movable dies and a fluid pressurejmotor for actuating said movable die, said motor having a valve automatically operative to supplyy pressure in alternation to opposite ends of said motor and to control the eX- haust offfluid therefrom, of control means l for said Sharpener comprising a member adapted to engage said valve and move it into position to cause raising of said movable `die, a stop valve adapted to control the supply of pressure fluid to said first mentioned valve and to the motor, mechanical ymeans normally extending into the path of sa-i'd'movable die and operative When so eX- tended to hold said die in raised position, and operating mechanism comprising a member operative 'when moved inone direction to release said first mentioned valve, to open said second mentioned valve, and to Withdraw said holding means, and in another position to move said first mentioned valve to a position to effect raising of said movable die, to close said second mentioned valve, and to permit said holding means to extend into the path of said movable die, said operatingmechanism including a mechanical interconnection whereby said second mentioned valve may be opened upon engagement of said holding means by said die on upward travel of the latter While said first mentioned valve is maintained in stationary position.

4C. In a drill Sharpener, a die, means including a fluid pressure motor for operating said die, a valve controlling said 'motor, means for holding said die stationary, and means connecting said valve and said holding means to close said valve entirely when said die is held stationary.

5. In an apparatus of the `character set forth, coacting die means, a motor for operating the same, means for supplying motive fluid under pressure to the motor, means for distributingsaid motive fluid therein to repeatedly actuate said motor, means to control said second mentioned means to maintain one of said die members in one position, mechanical means coacting there- With to lock said die in said position, and common control means having a. lost motion connection with said last mentioned means and controlling the operation of all of said means.

6. In an apparatus of the character set forth, coacting die means, a motor having a piston for operating the same, means for controlling the supplying of motive iluid kunder pressureV to the motor and for distributing it therein to cause said motor piston to be repeatedly actuated to cause repeated relative movements of said dies, mechanical means operable to maintain one of said die members in one position, and controlling means for said several means operative to effect movement of said die to said position, operation of said mechanical means to hold it therein, and linterruption lof the fluid supply to the motor.

7. In an apparatus of the character set l`forth, coacting die means, a motor having a piston for operating one of the same,

. meansfor controlling the supplying Of Inomeans operative in fixed sequence on'aotualtion thereof to effect movement of said die to said position, operation of said mechanical means to hold it therein, and interruption of the Huid supply to the motor.

. ture.

8. In an apparatus of the Acharacter set forth, an anvil, a movable hammer cooperating therewith, means includingv la, fluid pressure actuated piston for causing said hammer to strike a Work piece on said Aanvil a series of blows, means for'controlling the supply of fluid tosaid piston, means for mechanicallyl holding saidhammer in elevated position, and controlling. means for said two Y last mentioned means operative on aotuation automatically tocause said piston to' raise said hammer, to cause said holding means to engage the same, and tolinterriipt fluid supply to said piston.

In testimony whereof I `affix'ni'y signa- WADE H. WINEMAN'

Images