Punching device with punch retainer

Abstract

A punching device includes a fixed frame adapted to support punch means in alignment with a ram. An assembly of the punch, a guide and stripping sleeve and a stripping spring is removable as a unit, and such assembly includes means by which such assembly is retained together, especially during handling away from the frame of the punching device. To this end, the sleeve has a circumferential groove in which there is a radial aperture, and a retainer member is disposed in the groove and has a portion that projects radially through the radial aperture into an elongated recess in the punch body.

I claim as my invention: 
     
       1. A punch device comprising: a. a frame having a lower arm on which a die is supported, and an upper arm having a vertical bore aligned therewith;   b. a punch guide and stripper sleeve slidably disposed in the bore in said upper arm, there being a groove extending circumferentially in said sleeve, and a radial aperture through said sleeve at said groove;   c. a punch having a body slidably disposed in said sleeve, said body having an elongated recess in registration with said radial aperture;   d. a stripping spring acting between said sleeve and said punch to urge the lower end of said punch into said sleeve;   e. a lifting spring acting between said sleeve and said upper arm and urging said sleeve away from said die; and   f. a retainer member disposed in said groove and having a portion projecting radially through said radial aperture into said elongated recess in said punch body.   
     
     
       2. A punching device according to claim 1 in which said elongated recess is provided by an annular groove extending about the periphery of said punch body. 
     
     
       3. A punching device according to claim 1 in which said elongated recess is defined by a flat surface at one side of said body portion. 
     
     
       4. A punching device according to claim 1 in which said sleeve has a head formed as a washer engaging the end of said sleeve, and engaged by and disposed between said stripping and said lifting springs. 
     
     
       5. A punching device according to claim 1 in which said retainer is a wire having a bent end which is said portion in said radial aperture. 
     
     
       6. A punching device according to claim 1 in which said sleeve is freely slidably removable from said frame, in an upward direction. 
     
     
       7. A punching device according to claim 1 in which the lower end of said recess is a cam surface. 
     
     
       8. A punching device according to claim 1 in which said punch has a cutting portion of smaller size than its body, there being an upwardly and outwardly sloping cam surface at the lower end of said body portion. .Iadd. 9. A punch assembly for use with a cooperating die in a punching device comprising: a punch body having a cutting end portion and a head end portion with the cutting end portion slidably disposed in a stripper sleeve, the body having an axially elongated recess intermediate the ends received in the sleeve, the recess alignable with a radial aperture through the sleeve, the aperture open an exterior circumferentially extending groove in the sleeve, a washer surrounding the body intermediate the sleeve and the head end, a stripper spring surrounding the body intermediate the washer and the head end and acting therebetween to urge the cutting end into the sleeve, a retainer device received in the groove having a retainer portion in said aperture, means for resiliently biasing said retainer portion inwardly beyond an inner diameter of the sleeve and into said recess when the recess is aligned with the aperture, said means for resiliently biasing effective to retain the sleeve on the body by an interlocking action of the retainer portion and the recess, said means for resiliently biasing effective to allow the retainer portion to move radially outwardly in the aperture when the sleeve is pulled away from the head end with a force sufficient to overcome the bias when the retainer portion engages an axial bottom of the recess closest to the cutting end. .Iaddend. .Iadd. 10. The assembly of claim 9 wherein the cutting end of the punch is of smaller size than remaining portions of the punch body, there being an upwardly and outwardly sloping cam surface at the lower end of said body portion effective to overcome the resilient biasing means to move the retainer portion radially outwardly in the aperture when the sleeve is slipped onto the cutting end portion of the body and forced axially thereof whereby the sleeve can be pushed onto the punch axially of the punch until the retainer portion indexes with the recess to retain the sleeve on the body. .Iaddend. .Iadd. 11. The assembly of claim 10 wherein the recess has a downwardly and outwardly sloping cam surface at its axial bottom. .Iaddend..Iadd. 12. The assembly of claim 11 wherein the resilient biasing means includes a resilient portion of the retainer device, the resilient portion received in the groove. .Iaddend. .Iadd. 13. A punch device comprising: a. A frame having a lower arm on which a die is supported, and an upper arm having a vertical bore aligned therewith;   b. A punch guide and stripper sleeve slidably disposed in the bore in said upper arm, there being a groove extending circumferentially in said sleeve, and a radial aperture through said sleeve at said groove;   c. A punch having a body slidably disposed in said sleeve, said body having an elongated recess in registration with said radial aperture;   d. A stripping spring acting between said sleeve and said punch to urge the lower end of said punch into said sleeve;   e. A lifting spring acting between said sleeve and said upper arm and urging said sleeve away from said die;   f. A retainer device disposed in said groove and having a portion projecting radially through said radial aperture into said elongated recess in said punch body; and   g. means in said groove for resiliently urging said retainer portion inwardly into said elongated recess, said sleeve and said punch being capable of being manually pulled apart by a manual force sufficient to overcome said resilient bias, said retainer portion movable in said aperture whereby when said manual force is applied the retainer member portion will be forced outwardly in said radial aperture against the force of said means by engagement of said retainer member portion with a bottom of said recess, said recess having a diameter increasing bottom. .Iaddend. .Iadd. 14. A punching device according to claim 13 wherein said elongated recess is provided by an annular groove extending about the periphery of said punch body, said bottom being at a diameter increase between said groove and a normal diameter portion of said body. .Iaddend..Iadd. 15. A punching device according to claim 13 wherein said elongated recess is defined by a flat surface at one side of said body portion, said bottom being defined at a diameter increase between said flat surface and a normal diameter portion of said body. .Iaddend..Iadd. 16. A device according to claim 15 wherein said bottom is a cam surface. .Iaddend..Iadd. 17. A device according to claim 14 wherein said bottom is a cam surface. .Iaddend..Iadd. 18. A device according to claim 13 wherein said punch has a cutting portion of smaller size than its body, there being an upwardly and outwardly sloping cam surface at the lower end of said body portion whereby said sleeve can be forced axially onto said punch by a manual force sufficient to overcome said resilient bias means whereby said upwardly and outwardly sloping cam surface will urge the retainer member portion radially outwardly in said aperture. .Iaddend.