ional Bureau of Standarc

Library, N.W. Bldg

DEC 1 6 1964 Reference not to be

taken from the library.

\^ecltniccil ^lote 253

DISCLOSURES ON VARIOUS SUBJECTS

A Plumbing Vent Manifold,

A Micro-Adjuster,

A Glass Joint or Stopcock, and

A Miniature Puller

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
THE NATIONAL BUREAU OF STANDARDS

The National Bureau of Standards is a principal focal point in the Federal Government for assuring

maximum application of the physical and engineering sciences to the advancement of technology in industry and commerce. Its responsibilities include development and maintenance of the national stand- ards of measurement, and the provisions of means for making measurements consistent with those standards; determination of physical constants and properties of materials; development of methods

for testing materials, mechanisms, and structures, and making such tests as may be necessary, particularly for government agencies; cooperation in the establishment of standard practices for incorporation in codes and specifications; advisory service to government agencies on scientific and technical problems; invention and development of devices to serve special needs of the Government; assistance

to industry, business, and consumers in the development and acceptance of commercial standards and

simplified trade practice recommendations; administration of programs in cooperation with United

States business groups and standards organizations for the development of international standards of

practice; and maintenance of a clearinghouse for the collection and dissemination of scientific, technical, and engineering information. The scope of the Bureau's activities is suggested in the following

listing of its four Institutes and their organizational units. Institute for Basic Standards. Electricity. Metrology. Heat. Radiation Physics. Mechanics. Applied Mathematics. Atomic Physics. Physical Chemistry. Laboratory Astrophysics.* Radio Standards Laboratory: Radio Standards Physics; Radio Standards Engineering.** Office of Standard Ref- erence Data. Institute for Materials Research. Analytical Chemistry. Polymers. Metallurgy. Inorganic Materials. Reactor Radiations. Cryogenics.** Office of Standard Reference Materials. Central Radio Propagation Laboratory.** Ionosphere Research and Propagation. Troposphere

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* NBS Group, Joint Institute for Laboratory Astrophysics at the University of Colorado. ** Located at Boulder, Colorado.
NATIONAL BUREAU OF STANDARDS

Technical Note 253

ISSUED NOVEMBER 30, 1964

DISCLOSURES ON VARIOUS SUBJECTS

A Plumbing Vent Manifold,

A Micro-Adjuster,

A Glass Joint or Stopcock, and

A Miniature Puller

David Robbins, Editor

NBS Technical Notes are designed to supplement the Bureau's regular publications program. They provide a means for making available scientific data that are of transient or limited interest. Technical Notes may be

listed or referred to in the open literature.

For sale by the Superintendent of Documents, U. S. Government Printing Office

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TABLE OF CONTENTS

Title

A Vent Manifold for a Plumbing System

Author Page

R. W. Beausoliel 1 National Bureau of Standards

Washington, D. C. 20234

A Micro-Adjuster Providing

Purely Rectilinear Motion

N.V. Frederick

National Bureau of Standards

Boulder, Colorado 80310

A Glass Joint or Stopcock

Preventing Capillary

Action

R. Gary

National Bureau of Standards

Washington, D. C. 20234

Miniature Gear, Flange

and Bearing Puller

C. B. Haegele

U. S. Weather Bureau

Washington, D. C. 20235

iii
This Note presents four devices embodying

interesting and unusual solutions to problems

prevalent in their respective arts. These devices,

developed at the National Bureau of Standards and

the U. S. Weather Bureau, comprise a vent manifold for a plumbing system; a micro-adjuster providing purely rectilinear motion; a miniature gear,

flange and bearing puller, and a glass joint or stopcock preventing capillary action.

Tech. Note No. 253, November 30, 1964

iv
A VENT MANIFOLD FOR A PLUMBING SYSTEM

Robert W. Beausoliel

VENT MANIFOLD

BATHTUB VENT'

WATER CLOSET VEN

SINK VENT

WASHING MACHINE VENT

LAVATORY VENT

Normally, a number of the vents employed in a plumbing system

penetrate the roof of the building, and these penetrations greatly

increase the possibility of roof leakage and add to the cost.

In the present arrangement, manifold 10 penetrates the

gable where there is less chance of leakage, and the various

fixture vents 11 tie into the manifold. The manifold is sealed at

one end 16 and may have a screen 17 at the other end. The vents

and manifold may be constructed of various materials that give

suitable performance under the service to which vent systems are subjected.

Tech. Note No. 253, November 30, 1964

1
A MICRO-ADJUSTER PROVIDING PURELY RECTILINEAR MOTION

Nolan V. Frederick

Tech. Note No. 253, November 30, 1964

2
A MICRO-ADJUSTER PROVIDING PURELY RECTILINEAR MOTION

Nolan V. Frederick

This is a micro-adjuster that will bring about purely rectilinear

motion of an element. The element could be a mirror employed

in optical interferometry, a suspension for a galvanometer type

instrument, or any other device required to undergo small trans

latory motions without rotation.

The major component of the micro-adjuster resembles a tuning fork with one leg shorter than its partner. The free end

of the longer leg 10 is rigidly fastened to a reference plane 11, a block of solid matter, such that the vertical axis of the leg is

normal to the reference plane. The fastening means is selected

so as not to interfere with the normal elastic behaviour of legs

10 and 12 as they extend above the reference plane. The shorter

leg 12 must not come into contact with the reference plane or any

other object except kinematic connector 13, which is controlled

by means of screw 14, positioned on support post 16.

Connector 13 exerts a force on leg 12 in a plane parallel

to the reference plane 11 and in a plane passing through a vertical axis of both legs and half-way up the length L of leg 10.

Since the legs are free to fle^c and bend under the influence of

this force, it can be shown from elementary theory of bending of

elastic materials that part 15, above the confluence of the two

legs, will move in a translatory fashion without rotation. The

cross sections of the legs may be changed relative to each other

to change the ratio of motions of the screw and part 15.

Tech. Note No. 253, November 30, 1964

3
A GLASS JOINT OR STOPCOCK PREVENTING CAPILLARY ACTION

Robert Gary

Ftj. 2

23 20 22 21 24

3Z

Tech. Note No. 2 53, November 30, 1964

4
A GLASS JOINT OR STOPCOCK PREVENTING CAPILLARY ACTION

Robert GaryGround glass joints in common use today present two notorious

problems: the close fit of the inner and outer members of the

joints causes liquids to advance through the joints by capillary

action, and the joints do not of themselves form a vacuum-tight

seal.

The essential element of this disclosure is a groove positioned in either the inner or outer member of a joint or stopcock

in the manner illustrated in the figures.

Fig. 1 shows the inner member 10 and the outer member 11

of a tapered, ground glass joint with a groove 12 in the outer

surface of the inner member. The exact dimensions of the groove

are not essential, so long as the groove is sufficiently wide and

deep to provide two functions. First, it prevents liquids from

advancing by capillary action across the joint through the narrow

space between the inner and outer members 10 and 11. Second,

the groove permits the use of grease, if desired, without danger of

contaminating those materials which may come in contact with the

greased joint and without permitting the grease to be dissolved

away by solvents. The grease is applied either to portion 13 only

or to portion 14 only, as desired. The ungreased portion, together

with groove 12, serves to prevent the access of materials, such as

pure reagents or solvents, to the greased portion of the joint.

In Fig. 2, grooves 20 and 21 are similar to groove 12 and

serve a similar function. If it is desired to use grease, it may be

applied to the center section 22 only. The greased portion would

then be protected from attack by materials advancing from either or both ends of the joint. Alternatively, grease could be applied to

section 23 or to section 24 only. In this case, the greased portion

would be doubly protected from attack by materials advancing from

one direction only.

The teachings of the present disclosure may be applied to a stopcock, as shown in Fig. 3. Here grooves 30 and 31, positioned

in plug 32, separate the ungreased portion 33 from portions 34 and

35, which may or may not be greased as desired. The use of two

grooves on each side of 33 would provide even more protection against

contamination by grease of materials passing through the stopcock.

Tech. Note No. 2 53, November 30, 1964

5
The first stopcocks, made in early 1961, were fabricated bygrinding the grooves into commercially available, ground glass plugs,

but this does not necessarily represent the best method of fabrication.

Tech. Note No. 253, November 30, 1964

6
MINIATURE GEAR, FLANGE AND BEARING PULLER

Charles B. Haegele

Fcj.i

Tech. Note No. 253, November 30, 1964

7
MINIATURE GEAR, FLANGE AND BEARING PULLER

Charles B. Haegele

Tech. Note No. 253, November 30, 1964

8
MINIATURE GEAR, FLANGE AND BEARING PULLER

Charles B. Haegele

This description relates to a miniature gear, flange and bearing

puller that is designed around two basic considerations: adjustable length puller arms and variable range of work diameter.

Fig. 2 shows a knurled disk 10 with straight through slots

11, radiating outward 120° apart. The slots serve as puller arm

guides.

The straight through curved slots 14 in disk 15 (Fig. 3) are made with equal radii whose centers 18 are located 120°

apart on a common circle that is concentric with the outer diameter of hub 16. Each line 17 is tangent to the common circle at

one of the centers 18 and is a bisector of a curved slot 14, which

extends 45°, on either side of the line, as shown for one of the

slots in Fig. 3.

The puller arms 20 (Fig. 1) are made of cylindrical stock

that is milled flat for a fixed distance on opposite sides of the

stock. The flat sides are fitted for free movement in slots 11

(Fig. 2) and the cylindrical surfaces are fitted for free movement

in the curved slots 14 (Fig. 3).

Disk 10 is positioned over hub 16 of disk 15 and the two

disks are held together by a lock ring 19 (Fig. 1) that fits in slot

18 (Fig. 3). The disks are rotated in opposite directions until

each curved slot 14 is under a radiating slot 11. A puller arm 20

is then inserted through each opening. The desired length of each

arm is set and pins 21 are inserted. Knurled knob 25 is then positioned on thrust screw 26 and fastened by means of a roll pin 27,

and screw 26 is inserted into the threaded hub 16.

As disk 15 is rotated, the resultant force exerted by either

the inner or outer surfaces of the circular slots 14 against the

cylindrical surfaces of puller arms 20 moves each arm an equal

distance away from or toward the center of the disks, depending

upon the direction of rotation of disk 15.

Tech. Note No. 2 53, November 30, 1964 USComm-NBS

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