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Publication numberUS3407505 A
Publication typeGrant
Publication dateOct 29, 1968
Filing dateJun 25, 1965
Priority dateJun 25, 1965
Publication numberUS 3407505 A, US 3407505A, US-A-3407505, US3407505 A, US3407505A
InventorsFrank Parry
Original AssigneeMoore Products Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pneumatic dimension gages
US 3407505 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

0a. 29, 1968 F. PARRY 3,407,505

PNEUMATIC DIMENSION GAGES Filed June -25, 1965 Fla/ 5 25 4, ,32 $42 Has 33 I 35 a 35 INVENTOR. 34 l I p34 FRANK P400! .36 1k 1 -28 BY 2 L29 I v Arman United States Patent 3,407,505 PNEUMATIC DIMENSION GAGES Frank Parry, Feasterville, Pa., assignor to Moore Products Co., Spring House, Pa., a corporation of Pennsylvania Filed June 25, 1965, Ser. No. 467,018 7 'Claims. (Cl. 33172) ABSTRACT OF THE DISCLOSURE A pneumatic dimension gaging unit having a body with a leaf pivotally mounted with respect thereto, the leaf being positioned by the work to be gaged and having a flat portion extending from a fulcrum over and controlling a nozzle, the latter portion being spaced from the nozzle in a range such that fluid from the nozzle exerts a suction effect on the latter portion.

This invention relates to pneumatic dimension gages, and more particularly to an improved gage of simplified construction.

Pneumatic gages have heretofore been proposed, operating upon the principle that if a fluid under constant pressure is forced through upstream and downstream orifices in series with one another, the gaseous pressure in the space between the orifices will be a function of the relative sections of the orifices, and the measurement of the gaseous pressure in the space will indicate the effective area of the discharge or downstream orifice, as varied by the position of the work with respect thereto, within certain limits.

'In the prior US. Patent No. 2,881,528 of C. B. Moore there is disclosed a gage having a gage element with an improved mounting which has proven satisfactory in use. Difliculties arisewith the gage elements made in accordance with that patent, particularly in that the bending of the leaf to provide uniformity is difficult to attain so that each gage element requires calibration and recalibra tion upon substitution of a dilferent leaf. The fixed pivot pin also did not permit of adjustment.

In accordance with the present invention an improved gaging element is provided which is simple in construction, can be quickly assembled and disassembled for access to the gaging nozzle, can have any desired amplification, and has a flat movable leaf as a component which is simple to construct and which has improved operating characteristics.

In accordance with the present invention, also, an improved gaging element is provided which has an adjustable pivotal mounting for the leaf which is free from introduction of oblique force components.

It is a further object of the present invention, also, to provide an improved element having a pivotally supported leaf and in which the leaf is removably held in assembled relation in a simple but effective manner.

Other objects and advantageous features of the invention will be apparent from the description and claims.

The nature and characteristic features of the invention will be more readily understood from the following description taken in connection with the accompanying drawings forming part thereof, in which:

FIGURE 1 is a diagrammatic view of a pneumatic dimension gage in accordance with the present invention;

FIG. 2 is a plan view, enlarged, of a gage head or element unit employed in connection with the invention;

FIG. 3 is a longitudinal sectional view taken approximately on the line 33 of FIG. 2;

FIG. 4 is a longitudinal sectional view taken approximately on the-line 4-4 of FIG. 3; and

FIG. 5 is a transverse sectional view, further enlarged, taken approximately on the line 5-5 of FIG. 3.


It should, of course, be understood that the description and drawings herein are illustrative merely, and that various modifications and changes can be made in the structure disclosed without departing from the spirit of the invention.

Like numerals refer to like parts throughout the several views.

Referring now more particularly to FIG. 1 of the drawings, a pneumatic comparator gage is there illustrated having a fluid supply connection 10 in communication with any suitable source of filtered fluid, such as air, under pressure, which is connected through an adjustable fluid pressure regulator 11 for supplying fluid under constant pressure, and at a selected pressure level, from the supply connection 10. The pressure regulator 11 is connected by a conduit 12 through a restriction 13 which may, if desired, be fixed or manually or automatically adjustable as desired.

The restriction 13 is preferably connected to a conduit 14 having an instrument connection 15 in communication therewith. The instrument connection 15 may be connected to any desired instrument I, for indicating, recording, or controlling, and for purposes of illustration this is indicated as a pressure gage of the Bourdon dial type with a visible face 16 and a movable indicator pointer 17 for ascertaining the pressure conditions prevailing in the conduit 14.

The conduit 14 is in communication with a gage unit or element 20 shown in more detail in FIGS. 2 to 5, inclusive.

The gage element 20 is illustrated with a specific type of gage circuit having a pressure readout but it will be recognized that the gage element 20 may with equal facility be used in conjunction with other types of gage circuits in which a fluid pressure or flow is related to the linear dimension of space.

While the gage element 20 is shown in a particular position, as will hereinafter appear it can be used in any desired position, including that shown, inverted from that shown, on either side, pointed down or pointed up, or inclined from any of these positions. The gage element 20 preferably includes an elongated body portion 21 having a groove 22 along one face thereof, the groove 22 being bounded by an elongated horizontal flat face 23 and an inclined flat face 24, and by spaced side walls 25. The flat faces 23 and 24 preferably meet intermediate the ends of the groove 22 and the opposite end of the flat face 23 forms a ledge 26 which serves as a stop.

The body portion 21 can, if desired, have spaced parallel exterior faces 28 and a face 29 therebetween. The body portion 21 can be provided with one or more openings 30 for the reception of the mounting bolts (not shown) for securing the gaging unit at the desired location.

The body portion 21 preferably has, extending from the end thereof contiguous to the face 24, an extension 31 for connection of the conduit 14 and has an interior passageway 32 providing a nozzle which extends approximately normal to and terminates at the face 24 and in predetermined spaced relation, longitudinally considered, with respect to the pivotal mounting hereinafter described.

It will be noted that the nozzle 32 has a flat surface extending outwardly from it, consisting of a contiguous section of the face 24, and disposed for an appreciable and major portion of the circumference of the nozzle 32. This section of the face 24 extends from the nozzle for a distance of at least several times the diameter of the nozzle 32, and has a flat surface area surrounding the nozzle 32 at least five times the area of the nozzle 32, to provide a venturi or suction effect as hereinafter referred to.

The body 21 is provided intermediate the ends of the Patented Oct. 29, 1968 and contiguous to the side walls with openings 33 hav ing threaded portions 34 to provide adjustable pivot mountings. The openings 33 have balls 35 carried on threaded plugs 36 for adjusting the positions of the balls 35 above the faces 23 and 24. The plugs 36 are accessible through the face 29.

A leaf 40 is provided, which forms the movable portion of the gage unit and is preferably made of a flat strip of relatively stiff material and can be made as a metal stamping. The leaf 40 has relatively short but wide portion 41 at one end and adapted to be disposed above the nozzle 32, side guide projections 42 intermediate its ends which seat loosely in aligned transverse slots 43, and a relatively long but narrow portion 44 which is limited in one direction of movement by engagement with the ledge 26.

The leaf portion 44 has a contacting projection 45, such as a button or ball, secured thereto by soldering or in any other desired manner for engagement with the work to be gaged.

The contacting projection 45 is preferably of ultrahard material so that, upon repeated engagement with the work, wear will be kept to a minimum.

A cover 46 is provided of sheet metal having a top wall 47, side walls 48 adapted to resiliently frictionally engage the side walls 25, and an end Wall 49. The cover 46 serves to retain the leaf 40 in position when gaging fluid is not flowing and, also, tends to protect the leaf 40 and pivot balls 35 from mechanical damage from external objects.

The mode of operation will now be pointed outs If no fluid is supplied through the supply connection 10, or if for any other reason no fluid is supplied to the nozzle 32, the leaf 40 will be retained in the groove 22 by the cover 46 in whatever position the body portion 21 is mounted. The leaf 40 will not necessarily be seated on the balls 35 in the absence of fluid flow.

If pressure fluid is supplied through the nozzle 32 such fluid will impinge on the inner face of the short end section 41, spread sidewise in such a manner as to provide a venturi action or suction effect on this inner face, and tend to draw the short end section 41 towards the face 24 as permitted by the engagement of the leaf 40 with the balls 35.

If the leaf 40 is not properly seated this venturi action tends to cause such a seating.

The side guide projection 42 in the slots 43 restrain undesired turning movement or displacement in the main plane of the leaf 40.

If, now, the long end section 44 is moved towards the face 23 by the engagement of the work to be measured with the contacting button 45 and to an extent determined by the dimension of the work to be gaged, the space between the inner face of the end section 41 and the face 24 at the nozzle 32 will be varied and the area for discharge through the nozzle 32 will also be varied. Variation of the latter area will cause a change in the pressure in the space between the restriction 13 and the nozzle 32, and the prevailing pressure in that space can be observed on or utilized at the instrument I, which instrument, with suitable calibration, can be used for reading dimensions.

With the nozzle 32, end portion 41 and surface 24 functioning in this manner, no restoring spring is necessary to move the leaf 40 nor is any holding structure required for the leaf 40 other than the cover 46.

Magnification is, of course, dependent on the ratio of the length of the lever arm along the long end portion 44 from the contacting projection 45 to the balls 35 to the length of the lever arm along the'short end portion 41 from the balls 35 to the nozzle 32. While any desired ratio can be employed within relatively wide limits, a ratio of the order of 14 to 1 has been found satisfactory, with the length of the short lever arm of the order of oneeighth of an inch and the length of the long lever arm of the order of one and three quarter inches.

scribed 'obviates problems of shaping of the 'leaf Mite provide a fulcrum and also provides a freedom from sidewise displacement or distortion. The leaf 40 is self aligning on the balls 35.

A very light force is suitable for actuating the contact button 45 and can be made,'if desired, of theorderof two or three grams. Excessive force exerted by'theflworkbn the contact, button 45 cannot damage the'noz zle 12 and, althrough it is very light, the leaf ,40-is, nevertheless, very rugged, can be easily removed for cleaning and inspection of the gage, and can'even be dropped on the floor without upsetting the calibration. The cover 46 can be quickly and easily removed and replaced, as desired, being resiliently held in place. I

The gage is particularly useful for gaging dimensions or motions which occur at right angles to the longitudinal axis of the age unit.

I claim:

1. Pneumatic gaging apparatus comprising a gaging unit having a body with a longitudinal face portion, v

said body having a nozzle terminating at said face portion and with said face portion extending substantially around said nozzle,

a pair of projections extending above said longitudinal face and disposed such that the nozzle is out of alignment with a line extending through said projections,

an elongated leaf member having a plane face portion which extends continuously over said nozzle and over and in engagement with said projections,

the spacing between said longitudinal face portion and said plane face portion being in a range to set up a suction effect on said plane face portion of fluid from sad nozzle,

said leaf member having a portion spaced from said projections with a part for engagement with work to be measured.

2. Pneumatic gaging apparatus as defined in claim 1 in which the distance said projections extend form said face portion being in said range.

3. Pneumatic gaging apparatus as defined in claim 1 inwhich said leaf member has sidewise extending guide projections, and I saidbody has transverse slots in which said guide projections loosely engage.

4. Penumatic gaging apparatus as defined in claim 1 in which said projections extending from said face portion have adjusting members carried in said body in engagement therewith.

5. Pneumatic gaging apparatus as defined in claim 1 in which the surface surrounding the nozzle'has an area at least five times the area of the nozzle.

6. Pneumatic gaging apparatus as defined in claim 1 inwhich a cover is provided engaging said body and retaining said leaf member against dislodgment.

7. Pneumatic gaging apparatus as defined in claim in which 2 a cover is provided engaging said body and retaining said leaf member against dislodgment.

References Cited UNITED STATES PATENTS 2,594,581 4/1952 Phelps 308-2 2,881,528 4/1959 Moore 73'37.5 'XR S. CLEMENT SWISHER,A cling Primary Examiner.

HENRY ILAssisttmt Examiner.

U.S. DEPARTMENT OF COMMERCE PATENT OFFICE Washington, 0.0. 20231 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No 3 ,407 ,505 October 29, 1968 Frank Parry It is certified that error appears in the above identified patent and that said Letters Patent are hereby corrected as shown below:

Column 4, line 18, "age" should read gage line 36, "sad" should read said line 42, "form" should read from Signed and sealed this 3rd day of March 1970.

(SEAL) Attest:

Edward M. Fletcher, Jr.

Attesting Officer Commissioner of Patents WILLIAM E. SCHUYLER, JR.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2594581 *Jul 26, 1946Apr 29, 1952Gisholt Machine CoBalance testing machine rotor mounting
US2881528 *Nov 16, 1955Apr 14, 1959Moore Products CoPneumatic dimension gages
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4394282 *Sep 22, 1982Jul 19, 1983Exxon Research And Engineering Co.Composition for use in a magnetically fluidized bed
US4850221 *Sep 12, 1988Jul 25, 1989Molex IncorporatedWire sensing apparatus
U.S. Classification33/837, 73/37.5
International ClassificationG01B13/00
Cooperative ClassificationG01B13/00
European ClassificationG01B13/00