Device for preventing tool breakage in tool machines
OwnerRobert T. Cloptoninventor
Life of this patent
Estimating the term…
Abstract
An accessory for tool machines is provided comprising a tool holder isolatedly carried on bar springs to effect a floating mount. The holder yields in response to selective load stress during cutting and is restricted to a linear force path to relieve stress. The yielding movement relieves stress and can operate signals in the event of overload or operate control means such as switches to cut off tool machine motors.
Claims33
A device for protecting tools against excessive cutting pressure and being of the kind which has a support means for a holder means carried by a yieldable means prestressable to yield to a selected cutting pressure for operating a control means;
- the improvement wherein said yieldable means is a resilient mount means and wherein said holder means comprises a holder isolatedly and movably carried by said resilient mount means;
- and being restricted to linear movement thereby;
- said resilient mount means being secured to said support means and to said holder wherein said resilient mount means is the sole support for said holder;
- selective prestressing means intermediate said support means and said holder for prestressing said resilient mount means;
- said resilient mount means being thereby selectively prestressable for yielding movement of said holder relative to said support means when cutting pressure exceeds a selected prestress in said resilient mount means for operating a control means.
An accessory for a tool machine to prevent tool breakage wherein the tool machine is of the kind that provides relative motion between a cutting tool member and a work piece member with cutting contact pressure therebetween during the course of a cutting operation and wherein the accessory comprises a support means to be connected to a tool machine and carries a holder means to be secured to one member while the other member is provided with motion relative said other member by said tool machine;
- the improvement wherein:
- said holder means comprises a holder for said one member and further comprises a resilient mount means directly secured to said holder as the sole support for said holder;
- said resilient mount means being secured to said support means;
- prestressing means intermediate said support means and said resilient mount means for effecting a selected prestressed condition of said resilient mount means corresponding to a selected contact pressure whereby to permit a yielding movement of said holder in a direction to relieve contact pressure exceeding said selected prestressed condition in said resilient mount means;
- wherein said resilient mount means comprises bar spring means disposed to yield on excess cutting pressure and being fixedly secured to said support means and to said holder;
- said holder being carried solely and directly by said bar spring means and wherein said bar spring means effects plural supports for said holder to maintain linear movement of said holder.
An accessory for a tool machine to prevent tool breakage wherein the tool machine is of the kind that provides relative motion between a cutting tool member and work piece member with cutting contact pressure therebetween during the course of a cutting operation and wherein the accessory comprises a support means to be connected to a tool machine and carries a holder means to be secured to one member while the other member is provided with relative motion by said tool machine;
- the improvement wherein:
- said holder means comprises a holder for said one member and further comprises a resilient mount means for said holder as the sole support for said holder on said support means;
- said resilient mount means being secured to said support means;
- selective prestressing means intermediate said support means and said holder;
- said holder having tensile connection means for tensile force connection to a broach;
- means whereby said support means may be connected to a power driven slide of a tool machine;
- whereby excess tensile load effected by a broach connected to said holder effects said yielding movement.
An accessory for a machine tool to prevent tool breakage comprising a support means and a tool holder mountable therein secured to said support means in a floating mount comprised of at least two spaced springs intermediate said holder and said support means;
- said springs having flat sides in planes normal to movement of said holder when said holder is subjected to an axial cutting force effecting flexing of said springs whereby said springs maintain linear movement of said holder;
- means for prestressing said springs comprising bridge means extending across an end of said holder and spaced therefrom;
- adjusting means interposed between said holder and said bridge means operable to effect an initial prestressed condition of said springs whereby movement of said holder in response to cutting pressure occurs when said pressure is in excess of the prestressed condition of said springs;
- wherein said movement is operative to relieve such excess pressure and operative to control a manifestation of such excess pressure.
Dependencies are inferred from the claim text.