Keratome with miniature differential micrometer
AssigneeMicro Precision Instrument Company
InventorsClarence E. Giraud, Edward R. Perry, Russell G. Koepnick
Life of this patent
Estimating the term…
Abstract
A keratome includes a miniature differential micrometer having a barrel, a middle sleeve, and a inner sleeve connected by a threaded shaft having threads of two different pitches. One end of each of the middle sleeve and inner sleeve is drilled and tapped undersize and is slotted to conform resiliently to the threaded shaft. The middle sleeve is attached to a keratome by set screws drawing the middle sleeve into tight contact with the body of the keratome. The adjustable plate in the keratome is attached to the inner sleeve.
Claims20
A keratome including a body containing a cutting blade, a plate having a major surface defining a reference plane, said blade positioned in said body adjacent one edge of said plate, and a differential micrometer attached to said body and to said plate for precisely moving said plate in a direction perpendicular to said plane, wherein said differential micrometer comprises:
- a threaded shaft having a first portion without threads, a second portion having threads of a first pitch, and a third portion having threads of a second pitch;
- a first sleeve having internal threads at one end and attached to said plate at another end;
- a second sleeve having internal threads at a first end;
- said second sleeve having a second end attached to said body and engaging the second portion of said threaded shaft with the internal threads on said first end;
- and
- said first sleeve fitting within said second sleeve and engaging the third portion of said threaded shaft with the internal threads on the end of said first sleeve.
A differential micrometer comprises:
- a threaded shaft having a first portion without threads, a second portion having threads of a first pitch, and a third portion having threads of a second pitch;
- a first sleeve having internal threads at one end and attached to said plate at another end;
- a second sleeve having internal threads at a first end;
- a third sleeve having a bore in one end, said bore having an internal diameter fitting the outside diameter of said first portion of said threaded shaft;
- said threaded shaft extending through said third sleeve;
- said second sleeve having a second end attached to said body and engaging the second portion of said threaded shaft with the internal threads on said first end;
- and
- said first sleeve fitting within said second sleeve and engaging the third portion of said threaded shaft with the internal threads on the end of said first sleeve.
Dependencies are inferred from the claim text.