US1852592A - Feeding device - Google Patents

Description

April 5, 1932. w. A. SMITH, SR

FEEDING DEVICE Filed Oct. 10, 1930 2 Sheets-Sheet l INVENTOR. m'lh'am/ l'mlzb J11.

BY we HIS A TTORNEY.

April 5, 1932. w. A. SMITH. SR

FEEDING DEVICE Filed Oct. 10, 1930 2 Sheets-Sheet 2 INVENTOR. mlhiam/leimifi J1! BY a H15 ATTORNEY- Patented Apr. 5, 1932 UNITED STATES PATENT OFFICE WILLIAM A. SMITH, SR., OF EASTON, PENNSYLVAN IA, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY FEEDING DEVICE Application filed October 10, 1930. Serial No. 487,792.

This invention relates to feeding devices, but more particularly to a feeding device for percussive motors.

One object of the invention is to actuate the motor with respect to its support.

Another object is to assure the proper operative position of the working implement with respect to the percussive element of the motor.

Still another object is to enable the feeding 1() device to be conveniently controlled both for actuating the motor in the direction of the work and for retracting it therefrom.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawings accompanying the specification and in which similar reference'characters refer to similar parts,

Figure 1 is a longitudinal side elevation partly in section of a percussive motor and its so support having the invention applied thereto,

Figure 2 is a longitudinal sectional elevation of a detail,

Figure 3 is a plan View of the motor, its support and the feeding device, and

Figure 4 is a transverse View taken through Figure 1 on the line la looking in the direction indicated by the arrows.

Referring more particularly to the drawings, A designates generally a motor illustrated as being of the type commonly known as shank and bit punches employed for reforming or opening the bores of hollow articles, such as a drill steel B.

The motor -A accordingly comprises the usual cylinder O wherein is disposed a reciprocatory hammer piston D to actuate a punch pin E through the medium of an anvil block F to which the punch pin E may be suitably secured in any well known manner. The anvil block F is shown as being guided by a front head G which forms a closure for the front end of the cylinder O.

The rear end of the cylinder C may constitute a valve chest H, only the exterior of which is shown, and wherein may be arranged a suitable distributing valve of any well known type to effect the distribution of pres- I sure fluid to the ends of the cylinder C. On

the rear end of the cylinder O is arranged a back head J which forms a closure for that end ofthe cylinder and said back head as well as the front head G may be suitably clamped in operative position on the cylinder by side bolts K arranged on opposite sides of the motor.

As is customary in devices of this character, the motor A is provided with a suitable mounting or support shown in this instance in the form of rods L arranged in parallelism and extending through hollow lugs 0 carried by the motor A, as for instance, on the cylinder O. The rods L are secured at their extremitiesto a bracket P which may form a part of or be suitably attached to a machine, such as a drill sharpener (not shown) wherewith devices of this character are generally employed,

In accordance with the present invention, means are provided to enable the motor A to be bodily actuated along the rods L by the jars occurring within the motor upon reversal of the hammer piston D at the extremities of its strokes, both during the operation of driving the punch pin E into the work and also to withdraw the said punch pin from the work and, further, to render the successive jars resulting in one end ofthe cylinder ineffective to disturb the position of the motor with respect to its supportso that, in consequence, only alternate ars may be utilized for actuating the motor A.

In furtherance of these ends the motor A is-provided with a feeding device designated generally by Q, and comprising in this instance a bracket R which is arranged at the rear end of the back head J to which it is secured as by means of the side bolts K. The bracket R is provided with a pair of opposed cylinders S and T, the cylinder S preferably being located immediately adjacent the back head J and the cylinder T forming in this instance the rearmost extremity of the bracket R.

Disposed within the cylinders Sand T are pistons U and V respectively having rods W which are pivotally connected to a carriage X arranged between the cylinders and having a bore Y to receive a rod Z which is arranged between the rods L and supported at its extremities by the bracket P. As a convenient form of construction the rod Z is threaded with one end into the bracket P. The opposite end of the rod Z may, as shown, be in the form of a tapered portion Z) to lie within a correspondingly formed bore 0 of the bracket. Adjacent the tapered portion 6 and forming a part of the rod Z is a threaded end (Z for the accommodation of a nut 6 whereby that end of the rod Z may be clamped fixedly in position. I

The bore Y in the carriage X is preferably a sliding fit on the rod Z, and in one side of that portion of the carriage X through which the rod Z extends, as for instance in the upper side, is an opening f for the accommodation of a friction shoe 9 having a concave surface it which corresponds to the curvature of the surface of the rod Z whereon said friction shoe is adapted'to slide.

The opposite or top surface 9' of the friction shoe is preferably flat and acts as a seating surface for the adjacent end of an actuating arm is. On that end of the arm adjacent the friction shoe are inclined seating surfaces 0 and p which, in the various positions to whichthe actuating arm is may be actuated, bear against the surface 7' for pressing the friction shoe 9 into frictional engagement with the rod Z.

Extending through the arm 70 at a point near the surfaces 0 andp is a pin 9 which acts as a pivot for the arm 70. The ends of the pin 9 may be conveniently journalled or fixedly seated in the carriage X.

In its assembled position the actuating arm 76 extends laterally 0f the rod Z, and the uppermost end thereof is pivoted, as by means of a pin 1", to an end of a link 8. The opposite end of the link is pivoted on a pin If supported by an arm or a pair of arms M which lie on opposite sides'of the actuating arm k and may, as indicated, form integral portions of the bracket R. I

Convenient means are provided for controlling the admission of pressure fluid to the cylinders S and T for actuating the arm is to its various operative positions and also for exhausting such pressure fluid from the cylinders. The means provided for this purpose comprises a valve chest 11 shown for convenience of illustration as being secured to the bracket P whereon it may be held by bolts to. WVithin the valve chest o is a valve chamber 00 to accommodate the control valve 3 of the reciprocatory type having a stem 2 which extends to the exterior of the valve chest 1;. The projecting end of the stem .2 is pivotally secured to an actuating lever 2 connected pivotally to the bracket P as by means of a pin 3.

The valve 1 is providedwith a flange a and end heads 5 and 6 which lie to the left and right respectively of the flange e as Figure 1 is viewed. The heads and the flange of the valve are all of the samediameter and between the flange and the head is a reduced or neck portion 7 of sufflciently smaller di ameter than the flange and the head to permit the free passage of pressure fluid thereabout. Similarly, between the flange a and the head 6 is a reduced or neck portion 8 which cooperates with the wall of the valve chamberw to provide a passage for pressure fluid.

In the valve chest 2) is a passage 9 so arranged that it will at all times be in communication with the space afforded by the neck 7. Leading from the passage 9 and connected in a suitable manner to the valve chest '0 is a conduit 10 which is connected with its opposite end to the cylinder S to register with a port 11 in said cylinder for conveying pressure fluid thereto as well as for exhaust ing pressure fluid from the cylinder S to the. valve chamber 00 from whence the fluid may escape to the atmosphere through an exhaust port 12in the valve'chest n and controlled by the head of the valve.

A second passage 13 is formed in the valve chest 0) to communicate with the valve chamber m at a point between the flange 4 and the head 6. The passage 13 is so located that it will at all times be in communication w'th the valve chamber m. Leading from the passage 18 is a conduit 14 which may be suitably connected with its other end to the cylinder T to register with a por 15 in said cylinder for supplying pressure fluid thereto to act against the piston V. The conduit 14 also serves to convey exhaust fluid from the cylinder T to the valve chamber 00 and such exhaust fluid may escape from the valve chamber a to the atmosphere through an exhaust port 16 in the valve chest The pressure fluid required for actuating the pistons U and V and which is controlled by the valve 3 is conveyed to the valve chamber :12 by a supply conduit 17 which also serves to supply pressure fluid to the motor A. The supply conduit 17 accordingly has a branch connection 18 which opens into a port 19 in the valve chest 02 and the port 19 is controlled by the flange 4.

In order that the supply of pressure fluid to the motor A may be conveniently controlled without necessitating the manipulation of devices other than the control valve 7 means is interposed in the supply conduit 17 to act responsively to the movement of the control valve y for admitting pressure fluid to the motor A during the advancing and retractive movement of the motor on its support. Preferably this means is actuated by the motor for cutting off the sup ply of pressure fluid thereto said motor approaches its rearmost limiting or initial position. To this end a valve chest 20 is socured to the bracket P, as by means of a bolt or bolts 21. The valve chest 20 is provided with a valve chamber 22 to accommodate a reciprocatoryva'lve orplunger valve 23.

The plunger valve comprises a pair of heads2'1 and 25, preferably of the same diameter, andsaid heads are connected by a reduced stem26 about which pressure fluid may flow from one section of the supply conduit 17 to another portion of-said conduit which is connected to the back head J. As a preferred form of construction, the valve chest 20 is shown arranged in substantial alignment with the cylinder T, and the valve 23'is provided *withastem 27 which in this instance extends'through a bushing or sleeve 28 disposed in the bracket P and into the path of the cylinder T. V

The stem 27 may be provided with an enlarged portion 29 to form a shoulder 30 which acts as a seat for oneend of a spring 31 disposed within'the sleeve 28.

To the end that the valve 23 may be actuated to its open position by pressure fluid and sequentially to the manipulation of the control valve y in the proper direction, the valve chest 1) is provided with a passage 32 having its inlet opening so located with respect to the inlet port 19 that in a certain po sition of the valve'y pressure fluid may flow directly from the port 19 to the passage 32. A conduit 33 connected to the valve chest 4) conveys pressure fluidfrom the passage 32 to a passage 34 in the valve chest 20. The pressure fluid admitted into the valve chamber 22 through these channels acts against the free end of the head 25 for actuating the valve 23 to itsopen position.

Preferably the inlet port 35 of the passage 34 is of somewhat smaller area than a groove 36 inthe valve chamber 22 and through which groove pressure fluid may flow directly from the supply conduit 17 to the rear end of the valve chamber 22 to act against the valve 23. The operation of the device is as follows:

With the control valve 1 in the left hand limmedian line of said friction shoe to press the rear portion thereof firmly into engagement with the rod Z.

Simultaneously with the admission of pressure fluid to the cylinder T, pressure fluid will also flow from the port 19 throughthe valve chamber as into the passage 32, thence through the conduit 33 andthe passage 34intothe valve chamber 22 to actuate the valve 23' to its open position. In this position the heads 25: and 25 of the valve 23 will lie 011 opposite sides of the openings through which the several sections of the supply conduit 17 communicate with the valve chamber 22. Pressure fluid will then flow to the motor where it will be distributed to the ends of the cylinder G by the distributing element provided for this purpose.

With the actuating arm is in the position described and with the hammer piston D in operation, the motor A will be advanced along the support by the jars resulting upon reversal of the hammer piston D in the frontend of the cylinder C. Upon the reversal of the hammer piston D in the rear end of the cylinder C, and at which time of course the motor A is subjected to a similar jar, retractive movement of the motor A will be prevented by the recoil arresting devices, such as the friction shoe 9 and the actuating arm is. The arrangement is such that upon each forward stroke of the hammer piston D, and therefore upon the subjection of the motor to the jars imparted by the hammer piston, the motor will be moved bodily in the direction of the work in accordance with the degree of penetration of the punch pin E into the work.

This operation may continue until the Work has been performed, that is, until the bore in the working implement has been opened or until the motor A reaches its foremost limiting position. The control valve 1 may then be actuated rearwardly to place the port 19 in communication with the conduit 10 and at the same time to uncover the exhaust port 16 in the valve chest 1). The pressure fluid in the cylinder T will be exhausted to the atmosphere and pressure fluid will flow into the cylinder S to act against the piston U. In this way the actuating arm is will be moved to another limiting position wherein the surface 0 will bear against the opposite or front portion of the friction shoe 9 for pressing that end of the friction shoe into frictional engagement with the rod Z. In the new position of the control valve y the exhaust port 12 will be closed by the head 5 of said valve and communication between the port 19 and the passage 32 in the valve chest 0 will be cut off by the flange 4, so that no pressure fluid may then be supplied from the valve chamber a through the conduit 33 to the valve chamber 22 for maintaining the valve 23 in the open position. It is, however, essential that the valve 23 remain open to supply pressure fluid to the motor A for actuating the piston 1), since it is this element which serves to retract the motor A to its initial position.

In order to assure the retention of the valve 23 in the open position pressure fluid may then flow from the supply conduit 17 through the groove 36 into the rear end of the valve chamber 22 to hold the valve 23 open. 0 viously, a small portion of pressure fluid will thereafter leak from the valve chamber 22 through the conduit 33. Inasmuch, however,

- communication with the atmosphere.

as the outlet opening of the passage 3% is of greatly restricted area and in view of the further fact that only a very short period of time is required to retract the motor A the loss of pressure fluid resulting from such leakage will be only slight.

During the operation of the device subsequent to the reversal of the control valve 3 only the to which the motor A is subjected upon reversal of the piston D in the rear end of the cylinder C will be efiective to actuate the motor along the support. Upon the delivery of each impact or jar resulting in the rear end of the cylinder C the motor, and therefore the bracket R and the carriage X, are moved rearwardly so that the pressure of the actuating arm is upon the friction shoe is decreased sufiiciently to enable the said friction shoe to slide freely on the rod Z.

Immediately upon such movement, however, the pressure fluid acting against the piston U will cause the actuating arm to resume its prior binding position on the friction shoe so that upon reversal of the piston D in the front end of the cylinder C the motor will be effectively held against recoil in direction counter to that in which it is intended to actuate it. Subsequent reciprocations of the piston D will result in rapidly moving the motor A rearwardly and when the cylinder T contacts with the stem 2? the valve 23 will be actuated rearwardly in the direction of its closed position.

Obviously, the valve 23 may then be actuated into a position wherein the supply of pressure fluid'to the motor A will be very nearly cut off to prevent continuous operation of the motor A. There may, however, be a slight leakage of pressure fluid into the motor A which will cause occasional flutterings of the piston D. In this position of the valve 23 communication between the supply conduit 17 and the rear end of the valve chamber 22 will then be cut off by the head 25 of the valve 23. Immediately thereafter sufficient pressure fluid will leak through the passage 3 1-, the conduit 33, the valve chamber a: and the exhaust port 26 to enable the spring 31 to completely restore the valve 23 to its closed position.

The spring 31 may be calibrated to exert a pressure closely approaching that which the pressure fluid exerts against the valve 23 during the time the valve chamber 22 is in Obviously, therefore, when the supply of pres sure fluid to the rear end of the valve chamber 22 is out off the spring 31 will act instantly to cut ofl the further admission of pressure fluid to the motor A.

I claim:

1. In a feeding device, the combination with a motor and a support whereon said motor is slidably mounted, a hammer piston '1 reciprocable in the motor and imparting jars thereto for actuating the motor with respect to the support, of relatively movable coopcrating frictional members associated with the motor and the support to prevent recoil of the motor, pressure fluid actuated means for pressing one of the members into frictional engagement with another member to enable the hammer piston to advance and retract the motor relatively to the support, control means for selectively controlling the supply of pressure fluid to the fluid actuated means, and means actuated by pressure fluid supplied thereto by the control means for controlling the supply of pressure fluid to the motor.

2. In a feeding device, the combination with a motor and a support whereon said motor is slidably mounted, a hammer piston reciprocable in the motor and imparting jars thereto tending to actuate the motor longitudinally of the support, of relatively movable cooperating frictional members associated with the motor and the support to prevent recoil of the motor, fluid actuated means for pressing one member into different recoil resisting positions on the other member to enable the hammer piston to advance and retract the motor along the support, a control valve for selectively controlling the pressure fluid supply to the fluid actuated means, and a valve actuated by pressure fluid valved by the control valve for controlling the supply of pressure fluid to the motor.

3. In a feeding device, the combination with a motor and a support whereon said motor is slidably mounted, a hammer piston recipro cable in the motor and imparting jars thereto tending to move the motor with respect to the support, of recoil arresting means for the motor and comprising a fixed member and a movable member, pressure fluid actuated means for actuating the movable member into different positions of engagement with the fixed member to enable the motor to be advanced and retracted on the support by the hammer piston, a control valve for selectively controlling the pressure actuated means, a valve to control the supply of pressure fluid to the motor and being actuated in one direction by pressure fluid valved by the control valve, and means associated with the last mentioned valve and being actuated by the motor to move the said valve in a counter direction.

4. In a feeding device, the combination with a motor and a support whereon said motor is slidably mounted, a hammer piston reciprocable in the motor and imparting jars thereto tending to move the motor with respect to the support, of recoil arresting means for the motor and comprising a fixed member and a movable member, pressure fluid actuated means for actuating the movable memher into different positions of engagement with the fixed member to enable the motor to be advanced and retracted on the support by the hammer piston, a control valve for selectively controlling the pressure actuated means, a valve to control the supply of pressure fluid to the motor and being'opened by pressure fluid valved by the control valve and having a stem adapted to be actuated by the motor for closing the last mentioned valve.

5. In a feeding device, the combination with a motor and a support whereon said motor is slidably mounted, a hammer piston reciprocable in the motor and imparting jars thereto tending to move the motor along the support, of recoil arresting means associated with the motor and the support and comprising a fixed member and a movable member, a plurality of pressure actuated means for ac- V tuating the movable member into engagement with the fixed member, a control valve for selectively controlling the supply of pressure fluid to the pressure actuated means and thereby move the movable member into different engaging positions for resisting recoil of the motor upon the occurrence of alternate jars in the motor during the operation of the piston, a valve for controlling the supply of pressure fluid to the motor, said valve being actuated to one limiting position by pressure fluid and held in such position by pressure fluid throughout both the advancing and retracting movements of the motor along the support, and a stem on the last mentioned valve adapted to be actuated by the motor for moving the said valve to another limiting position. 7

6. In a feeding device, the combination with a motor and a support whereon said motor is slidably mounted, a hammer piston reciprocable in the motor imparting jars thereto tending to move the motor along the support, of recoil arresting means for the motor and comprising a movable member carried by the motor and a fixed member, pressure fluid actuated means for actuating the movable member into engagement with the fixed member, a control valve for selectively admitting pressure fluid to the fluid actuated means to actuate the movable memher into different positions of engagement with the fixed member, a valve to control the supply of pressure fluid to the motor and being opened and held open by pressure fluid controlled by the control valve during the advancing movement of the motor, means for supplying holding pressure fluid from a source of supply to the last mentioned valve for holding the valve open during the retract-- ing movement of the motor, and a stem adapt ed to be actuated by the motor for closing the last mentioned valve.

7. In a feeding device, the combination of a motor and a support whereon said motor is slidably mounted, a hammer piston reciprocable in the motor and imparting jars thereto tending to move the motor along the support, of recoil arresting means for the motor and comprising a movable member carried by the motor and a fixed member, a plurality of cylinders carried by the motor, pistons therein fixedly connected to the movable member, a control valve for selectively admitting and exhausting pressure fluid to and from the cylinders to actuatethe movable member into different positions of engagement with the fixed member, a valve to control the supply of pressure fluid to the motor and being actuated to one position and held therein by pressure fluid admitted thereto by the control valve during the movement of the motor in one direction along the support, means for supplying holding pressure fluid to the last mentioned valve during the opposite movement of the motor along the support, and for transmitting the movement of the motor to the last mentioned valve for closing the said Valve.

In testimony whereof I have signed this specification.

WILLIAM A. SMITH, SR.

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