US953933A - Measuring instrument. - Google Patents

Description

2.11. TUCKER.. l MEASURING INSTRUMENT.

APPLIOATION FILED MAY 12, 1909.

953,933. Patented Apr .5,191o.

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ATTDRNEY.

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ZECHARIAH R. TUCKER, OF PROVIDENCE, RHODE ISLAND.

MEASURING INSTRUMENT.

To @ZZ whom it may concern:

Be it known that I, ZECHARIAH B. TUCKER, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Measuring Instruments, of which the following is a specification.

My invention relates to micrometric measuring instruments adapted for use as heigh or depth gages, and calipers, and is designed to provide an instrument which shall have a measuring capacity in excess of the graduated area of the structure, and which will enable the operator to employ any desired measuring unit, and to attain this end in a compactly arranged structure.

The invention consists in producing the results above specified substantially as hereinafter claimed.

In the accompanying drawings which form a part. of this specification, Figure 1, is a side elevation of a pair of micrometer calipers embodying my invention, Fig. 2, a similar elevation of the same partially in central longitudinal section, Figs. 3 and 1, rear and front end elevations respectively of the same, and Fig. 5 a section on line 5-5 of Fig. 2.

In the views similar characters of reference indicate like parts throughout.

1n the preferred construction 1 represents a bar of cylindrical or other cross section, to one end of which is fixed by a pin 2 or otherwise a jaw 3 which jaw if preferred may be removably connected with the bar. In the aresent instance the jaw has an end bearing face 41.

Loose upon the bar 1 is a barrel 5 with an exterior micrometric scale 6 and whose inner end forms the base of an integral jaw 7 having an end bearing face 8. In a threaded opening 9 in the barrel is a set screw 10 whose pointed end 11 registers in a groove 12, extending longitudinally of the bar 1. The interior of the barrel 5 is bored out a major portion of its length to form an internal abutment 14 at its inner end and an annular space around the bar 1. The interior of the outer end of the barrel 5 is provided with threads 16 engaging the threads 17 of a hollow micrometer screw 18 carrying the usual measuring thimble 19 with its scale 20. Obviously if desired the usual micrometer nut may be introduced between the barrel 5 and the screw 18.

Specification of Letters Patent.

Application iled May 12, 1969.

Patented Apr. 5, 1910.

serial No. 495,462.

Slidably mounted upon the bar 1 in contact with the hollow interior face of the screw 18 is a sliding member which in this instance consists of a sleeve or bushing 21 provided upon the exterior of its inner end with an annular projection or collar 22 and having an opening 23 to receive a screw 24C whose point 25 loosely ,extends into the groove 12 to prevent the sleeve 21 from rotary movement. it will be understood that a spline or other well known element may be usedfor this purpose. sleeve has exterior threads 26 and is longitudinally split as at 27, to form integral clamping fingers or segments 28, engaged by a clamping nut 29 whose threads 30 engage threads 26. Then the nut 29 is tightened it holds the sleeve 21 fast to bar 1, and when loosened, releases the bar 1.

.The parts 5, 7, 18, and 19 which comprise an ordinary micrometer frame may be modified in any usual convenient manner. For the screw 10 which clamps this frame to the bar and holds the latter against rotation any other convenient clamping means may be substituted.

The operation of my device isas follows. The thimble 19 is turned until its dial 2O reaches upon the scale 6 the graduation indicative of the space or measurement which it is understood shall constitute the unit of measurement to be employed in each particular instance. The screw 10 and nut 29 being loosened, the frame andsleeve 21 are moved to the left or inwardly until the bearing faces t and 8 contact with each other, the shouldered end of sleeve 21 contacting with the abutment let. The screw 10 is now tightened, and the sleeve 21 is outwardly moved until its shoulder 22 abuts against the end of screw 18, whereupon the nut 29 is tightened. Then the screw 10 is loosened and the frame is moved outwardly until its abutment 14; rests against the end of sleeve 21, whereupon the screw is again tightened. The space between the bearing faces 4: and 8 will now be equal to the unit of measurement indicated upon the barrel 5. The measurements may be indefinitely increased by the described alternating outward movement of the frame and sleeve 21. Fractional measurements may be obtained by employing the dial 20 and scale 6 in the manner usual in micrometer calipers.

By removing the jaw 3 it is obvious that my device may be conveniently used as a The outer end of the,

depth gage. Then used as a height gage the shape of jaiv 3 is preferably changed somewhat to form a more stable base.

Wlhat I Claim is,`

l. ln a measuring instrument, the eombination with the frame, of a` threadless measuring bar within the frame and arranged to slide longitudinally thereof, and a sliding member Within the frame mounted for longitudinal movement upon the bar.

2. In a measuring instrument, the combination with the frame, of a non rotary measuring bar within the frame and arranged to slide longitudinally thereof, a sliding member Within the frame mounted for longitudinal movement upon the bar, and means adjustably Clamping the slidingmember.

8. In a measuring' instrument, the combination ivith the frame, of a measuring bar slidably mounted in the frame, a sleeve slidably mounted upon the bar and in slidable Contact with the interior of the frame, and means upon the sleeve Within the barrel for limiting the movement of the sleeve.

et. In a measuring instrument, the Combination With the frame, of a measuring bar slidably mounted in the frame, a slidable sleeve upon the iar intermediate the frame and bar, and elaiuping means upon the sleeve.

5. n a measuring instrument, the Combination With a frame, of a measuring' bar slidably mounted in the frame, a sleeve slidably mounted Within the frame and upon the bar, and means upon the sleeve for limiting the movement of the sleeve upon the bar.

6. in a measuring instrument, the eombination with a frame, of a measuring' bar Within the frame and arranged to slide longitudinally thereof, a sleeve slidably mount` l I i i ed on the bar within the frame and provided at one end With an annular shoulder m the path of the frame.y and clamping means upon the other end of the sleeve.

T. n a measuring instrument, the combination With the frame, of a measuring bar slidably Vmounted in the frame, a sliding member upon the bar, and means upon the sliding member for Clamping the bar to the sliding member.

S. ln a measuring instrument, the combination With a frame, of a measuring bar within the frame and arranged to slide longitudinally thereof, a sleeve slidably mounted on the bar within the frame and provided `With a shoulder in the path of the frame` and provided ivith spring' fingers. and a Clamping nulL upon the fingers.

9. In a measuring instrument, the Combination ivith a frame, of a measuring bar slidablv mounted in the frame and provided with a longitudinal groove, a jaw upon thi` bar, a slidahle member upon the bar, means for clamping the sliding member' to the bar, a sereiv in the frame entering the slot in the har, and a sereiv in the slidingl member registering in said groove.

l0. ln a measuring instrument, the eombination `with a frame, of a measuring' bar slidably mounted in the frame, a jaiv upon the bar, a sleeve slidably mounted upon the bar, means upon the sleeve aud engaging the bar to prevent rotary movement of the sleeve, and means upon the frame for preventing rotary movement of the bar.

ln testimony whereof l have atiixed my signature in presence of two Witnesses.

ZECHi-/XRTAH R. TUCKER Vilitnesses LEONARD lV. HoirroN, M. HIGGINS.

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