US1729898A - Die shoe and guide for punch presses - Google Patents

Description

Oct. 1, 1929. RUGGLES 1,729,898

DIE SHOE AND GUIDE FOR PUNCH PRESSES Filed Nov. 30; 1927 2 Sheets-Sheet 1 K li 8 if /2 l3 1-?" x h 47.5 I; INVENTOR Q John Milton Rug; Les i \Q RNEYS Oct. 1, 1929. J. M. RUGGLES 1,729,898

DIE SHOE AND GUIDE FOR PUNCH PRESSES Filed Nov. 30, 1927 2 Sheets-Sheet 2 j @1011 M'Zz f 1072 u 65 BY@% Z7227 ATTORNEY 9 Patented Get. 1, 1929 JOHN MILTON RUGGLES, OF THREE RIVERS, MICHIGAN DIE SHOE AND GUIDE FOR PUNCH ERESSES Application filed November 30, 1927. Serial No. 236,645. 3

This invention relates to improved die shoes and guides for punch presses.

The objects of the invention are:

First, to provide a die shoe and guide means for punch presses.

Second, to provide such a structure with means for automatic lubrication.

Further objects and objects pertaining to details and economies of my invention will definitely appear from thedeseription to follow.

I accomplish the objects of my invention by the devices and means described in the following specification. The invention is clearly defined and pointed out in the claims.

A device embodying my invention is clearly illustrated in the accompanying drawing forming a part of this specification, in which Fig. 1 is a front elevation view of my die shoe structure ready for attachment to a punch press.

Fig. 2 is a plan view of the parts appearing in Fig. 1 a portion of the front extension of the upper shoe being broken away the conduits for lubricant being indicated by dotted lines.

Fig. 3 is avertical detail sectional view somewhat enlarged taken on the irregular line 33 of Fig. 2.

Fig. 4 is a detail sectional elevation view on line 4i of Fig. 2 through the guide pins and the pump, portions being shown in full lines.

Fig. 5 is an enlarged detail fragmentary sectional elevation through the pump taken on line 5-5 of Figs. 1, 2 and 4 portions being in full lines.

Fig. 6 is an enlarged detail transverse section on line 66 of Figs. 4 and 5.

The parts will be identified by their numerals of reference which are the same in all the views.

1 is the bottom or die shoe. 2 are slotted lugs for attaching the same to the table of a punch press. 3 is the upper or punch shoe corresponding to the bottom shoe. 4 is the shank of the upper shoe for attachment to the ram of a punch press. 5 is the pump cylinder and 6 is the pump piston of the lubricating pump.

11 is a front extension of the bottom or die shoe which is provided with a pair of guide or leader pins 12. These cooperate with the punch shoe 3 which has forward extensions 31 each containing bushed guide bores 32 to engage and pass over the said guide pins 12. Around the base of each guide pin 12 in shoe 1 is the trough 13 provided with a connecting trough 14 which leads to the central Well 15 for the lubricant. Each pin 12 has a central oil passage 16 to its upper end with lateral openings 161 at the sides. The upper ends of the leader pins are beveled and the bushings are chamfered and receive the same.

The upright pump cylinder 5 is screw threaded into the bottom of the well 15. (See Fig. 5.) The intake 51 of the pump is provided with pump check valve 52 held in place by coiled spring 53 supported by the hollow screw 54 and connects to the annular passage 56 which delivers through apertures 501 into and from the bottom of the said cylinder 5.

6 is the piston or plunger having the piston rod 61 which projects upwardly in position.

62 is a coiled spring in the base of the pump reacting to hold the piston in the up position seen in Fig. 3. 7 is the tappet which is screw threaded into a forwardly extending lug 33 on the shoe 3. The tappet 7 is held in adjusted position by a lock nut 71 as seen in Figs. 1, 4 and 5. The delivery of the pump is from passage 56 past check valve 57 which is held in place by spring 58 and the hollow screw 59 and connects to the discharge passage 17 connecting to the central bores 16 in each leader pin 12.

The pump cylinder 5 is provided with oblique Vent apertures 502 at the top and with relief apertures 503 at a point just below the lower end of the piston in its elevated position, see Fig. 5.

In operation it will be observed that the upper punch shoe 3 is lifted entirely independent of the lower shoe 2 and separate from the leader guide pins 12. On the down stroke the tapper 7 strikes the piston rod 61 forcing the piston down and forcing any lubricant within the pump out through the passage 17 up through the central bore 16 through the lateral apertures 161 to lubricate the upper end of each pin.

When the upper shoe is raised above the pins any oil on the upper end of a pin will flow down the sides and lubricate the same completely and thoroughly. If there is much excess it will flow on down into the trough 13. If adjusted to about the right point the oil will simply fiow over the pin and be forced down by the bushing 32 when the punch shoe 3 descends. The oil then flows readily back into the well 15 and is circulated by the pump.

I provide a removable screen 8 over the lubricating portion of the bottom shoe, the same surrounding the piston rod 61 and the lower ends of the, leader pins.

The structure is capable of wide modification without departing from my invention. A structure provided with a single leader pin would be desirable. On the other hand more than two pins can be provided. The pump shown is very simple. It could be modified.

Different kinds of valves are. available. The vents and reliefs might be omitted. The oil might be a continuous supply and notcirculated by a very close adjustment.

I desire to claim the precise structure which has special merit. I also desire to claim the invention broadly as pointed out in the appended claims. I I

Having thus described my invention what I claim as new and desire to secure by Letters, Patent is:

1. The combination with a bottom or die shoe, of means for attaching it to the table of a punch press, front projections on said die shoe with leader pins supported therein, having vertical central oil passages leading from near the bottom to the top thereof, with lateral apertures near the top, a central lubricant well between said pins, an upright piston pump in said well, with an upwardly.- projecting piston rod, a return spring beneath the said piston, an intake passage. containing check valves between the pump and well, a discharge passage leading therefrom and passages leading to the central bores in said leader pins, an upper or .die shoe with forward projections with bores to cooperate with said leader pins, a forward projection with an adjustable tappet disposed to act upon and depress the pump piston rod when in lowered position, all coacting substantially as described for the purpose specified.

2. The combination with a bottom or die shoe, of means for attaching itto the table of a punch press, front projections on said die shoe with leader pins supported therein, having vertical central oil passages leading from near the bottom tothe top thereof, a central lubricant well between said pins, an upright pisto-npump in said well, with an upwardlyprojecting piston rod, a return spring beneath the said piston, intake passage containing check valves between the pump and well, a discharge passage leading therefrom, and passages leading to the central bores in said leader pins, an upper or die shoe with forward projections with bores to cooperate with said leader pins, a forward projection with an adjustable tappet disposed to act upon and depress the pump piston, rod when in lowered position, all coacting substantially as described for the purpose specified.

3. The combination with a bottom or die shoe provided with a leader pin having an oil bore therethrough with lateral apertures near the top, of an upright pump with a projecting piston, a return spring for holding the piston upward, an upper or punch shoe with a bore for cooperation with the said leader pin, a. tappet carried by said upper die shoe positioned to cooperate with said projecting pump piston, and an oil passage to the leader pin to deliver oil when the die is depressed, as specified.

l. The combination with a bottom or die shoe provided with leader pin having an oil bore therethrough, an upright pump with a projecting piston, a return spring for holding the piston upward, of an upper or punch shoe with a bore for cooperation with the said leader pin, a tappet carried by said upper die shoe positioned to cooperate with said pro ecting pump piston, and an oil pie 1 sage to. the leader pin to deliver oil when the die. is depressed, as specified.

5. The combination with a bottom or die. shoe, of an upright leader pin having an oil bore therethrough, an upper or punch shoe with a bore for cooperating with said leader pin, and an oil pump operated by the movement of said upper shoe. for delivering oil tov the leader pin, as specified.

In witness whereof I have hereunto set my hand.

JOHN MILTON RUGGLES.

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