DIAL INDICATOR GAGE

• US 3,721,010 A
• Filed: 02/08/1971
• Issued: 03/20/1973
• Est. Priority Date: 02/08/1971
• Status: Expired due to Term

• Current Assignee: Harold E. Ristow
• Original Assignee: Harold E. Ristow
• Inventors: Ristow, Harold E.
• Primary Examiner(s): Martin, Jr., William D.
• Application Number:
  US05/113,125
• Time in Patent Office: 771 Days
• Field of Search: 33/172R,172A,169B,147A-147F,148A,148E 116/129R,129F
• US Class Current: 33/556
• CPC Class Codes: G01B 3/28 Depth gauges

Abstract

Gage to measure depth of bore or thickness of workpiece, etc. Diametrically projecting, spring-urged contact stem transverses cylindrical housing which has rotatable inner sleeve with internal ring gear. Rack teeth on stem engaged by one or more intermediate gears which drive ring gear and turn sleeve which carries dial indicator relative to overlying stationary pointer, the zero setting of which can be changed however to indicate desired standard for workpiece. Gear train and diametrically large dial face produce very high accuracy.

Claims

1. A measuring gage of the character described, comprising in combination:

a housing structure providing a generally annular guideway, a stem reciprocably mounted in said structure and disposed generally diametrically to said guideway, with a work-contact end selectively projectable therebeyond, a length of said stem which is encompassed by said housing having rack teeth, a sleeve rotatably disposed about said annular guideway, the sleeve forming a ring gear and fixedly carrying an indicator dial, and intermediate gear means operatively connecting the rack teeth of said stem with said ring gear, whereby longitudinal movement of the stem serves to rotate said indicator dial.

2. The measuring gage of claim 1 which additionally has resilient means for normally holding the work-contact end of said stem in projected position.

3. The measuring gage of claim 1 wherein said rotatable sleeve and dial are journalled on an axially disposed shaft wIthin the housing structure, which shaft fixedly supports a pointer alignable with said indicator dial.

4. The measuring gage of claim 1 wherein said housing structure carries a pointer selectively rotatable concentric to said indicator dial whereby the pointer can be set at any desired zero position corresponding to a standard used for comparison with a workpiece.

5. The measuring gage of claim 1 wherein said intermediate gear means consists of a single gear disposed within said housing and mutually engaging the rack teeth and ring gear, which rack teeth and ring gear are axially separated relative to said housing.

6. The measuring gage of claim 1 wherein said intermediate gear means comprise a gear train disposed within said housing between the rack teeth and ring gear and adapted to multiply the linear movement of the stem in transmitting it to the annular movement of the ring gear and indicator dial.

7. The measuring gage of claim 6 wherein said stem carries indicia for indicating each corresponding complete rotation of the indicator dial.

8. The measuring gage of claim 7 wherein said housing structure carries a pointer selectively rotatable concentric to said indicator dial, whereby the pointer can be set at any desired zero position corresponding to a standard used for comparison with a workpiece.