Adjustable long life stripper

This adjustable stripper tool is for use in custom tooling, magnetic tooling, and adjustable tooling, where a punching machine is employed. Primarily, it consists of a hollow cylindrical main body, which is received on a punch of the machine, and it is adjustable in length by placing or removing a multiple number of spacers in its metal cap, which is force-fitted on the open end of the main body.

This invention relates to tools, and more particularly, to an adjustable 
long life stripper. 
The principal object of this invention is to provide an adjustable long 
life stripper, which will be employed in custom, magnetic, and adjustable 
tooling, so as to prevent having to use a protective coating, as was used 
in the prior art, to prevent marking and damaging the material in punching 
operations. 
Another object of this invention is to provide an adjustable long life 
stripper, which will be adaptable for punching both light and heavy 
material. 
Another object of this invention is to provide an adjustable long life 
stripper, which will be non-marking, non-cupping, non-extruding, and will 
also provide for longer punch life. 
A further object of this invention is to provide an adjustable long life 
stripper, which will operate with the same pressure on full length punches 
and short punches. 
A still further object of this invention is to provide an adjustable long 
life stripper, which will shape holes at no extra cost, and will also have 
inexpensive tube replacements. 
An even further object of this invention is to provide an adjustable long 
life stripper, which will employ a reusable twist-on friction cap, and 
also resusable spacers, for saving in set-up time. 
Other objects of the present invention are to provide a long life stripper, 
which is simple in design, inexpensive to manufacture, rugged in 
construction, easy to use and efficient in operation.

According to this invention, a stripper 10 is shown to include a urethane 
plastic main body 11, having an end wall 12 integral therewith. The outer 
surface of end wall 12 is slightly convex and beveled at its outer 
periphery, and the bore 13 of main body 11 removably receives punch 14 of 
the top die shoe structure 15. The end wall 12, of main body 11, serves to 
engage with the material 16 on the bottom die show 17 structure, and a 
metal cap 18 is frictionally and removably received on the open end 19 of 
main body 11. A central opening 20, through cap 18, serves as a means of 
removably receiving punch 14, and a plurality of circular spacers 21 
engage with each other, and one of the outer spacers 21 of the plurality 
engages with the open end 19 of main body 11, and the other outer spacer 
21 of the plurality engages with the end wall 22 of cap 18. The spacers 21 
are removed as desired, so as to adjust the overall length of the stripper 
10 assembly, which is necessary for different die operations, and the 
outer periphery of cap 18 is knurled, so as to be easily gripped by the 
user when forcing cap 18 onto the main body 11. 
In use, one or more of the spacers 21 are removed from cap 18, to adjust 
the stripper 10 to the proper length for the punch 14 and die 14a used, 
and the metal cap 18 is then gripped by the user and force-fitted onto the 
open end 19 of main body 11. The stripper 10 assembly is then urged onto 
the punch 14, and, during a punching operation, the punch 14 will push an 
opening 23 through end wall 12 and simultaneously, disc 25 will be punched 
free of material 16, and will leave the opening 24 therein, which will not 
be marked, cupped, etc. The main body 11 will be used continually 
thereafter, and when worn, is easily replaced by a similar one. 
Referring now to FIG. 6, a modified main body 27 is shown to include an 
insert or slug 28, of hard urethane material, which is externally threaded 
and is threadingly received and cemented in internally threaded opening 
29, at the bottom of main body 11. 
In use, main body 27 functions in the same manner as was heretofore 
described of main body 11, with the exception, that opening 29 is 
preformed, and insert 28 is punched out, by means of punch 14. 
Looking now at FIGS. 4 and 5 of the drawing, a modified form of stripper 30 
is shown to include a plastic main body 31, having an end wall 32, similar 
to end wall 12 of main body 11 of stripper 10, heretofore described. A 
metal cap 33 is knurled on its outer periphery, and is fitted onto the 
open end 31a of main body 31 of the user's fingers. The bore 34 of main 
body 31 aligns with opening 33a through cap 33, for receiving the punch 
14, and a pair of oppositely opposed bayonet-type cut-out slots 35, 
through cap 33, are angularly sloped upwards, and include a plurality of 
equally spaed-apart indentations or recesses 36, which may alternately 
receive the oppositely opposed and projecting pins 37, which are 
force-fitted in the openings 37a, through the upper extremity of main body 
11, and the combination of the pins 37 and the slots 35 serve as 
adjustment means, to lengthen or shorten the stripper 30 assembly when 
necessary. 
In use, stripper 30 functions in the same manner as was heretofore 
described of stripper 10, with the exception, that the cap 33 is rotated 
and urged downward or upwards, with the pins 37 being positioned in 
whichever indentation 36 desired, to obtain the proper overall lengthening 
of the stripper 30. 
It shall be noted, that when cap 33 is being placed onto main body 31, the 
pins 37 must first be entered into the vertical portions 35a of slots 35, 
before any shortening or lengthening of stripper 30 can be effected. 
While various changes may be made in the detail construction, it is 
understood that such changes will be within the spirit and scope of the 
present invention, as is defined by the appended claims.