C /3-^'^^rS BOCDMEMS fiBciioir ^ecltniccil ^iote 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, particu- larly for government agencies; cooperation in the establishment of standard practices for incorpora- tion 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, tech- nical, 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. Ap- plied Mathematics. Atomic Physics. Physical Chemistry. Laboratory Astrophysics.* Radio Stand- ards Laboratory: Radio Standards Physics; Radio Standards Engineering.** Office of Standard Ref- erence Data. Institute for Materials Research. Analytical Chemistry. Polymers. Metallurgy. Inorganic Mate- rials. Reactor Radiations. Cryogenics.** Office of Standard Reference Materials. Central Radio Propagation Laboratory.** Ionosphere Research and Propagation. Troposphere and Space Telecommunications. Radio Systems. Upper Atmosphere and Space Physics. Institute for Applied Technology. Textiles and Apparel Technology Center. Building Research. Industrial Equipment. Information Technology. Performance Test Development. Instrumentation. Transport .Systems. Office of Technical Services. Office of Weights and Measures. Office of Engineer- ing Standards. Office of Industrial Services. * 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 Bu- reau'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 Washington, D.C. 20402 - Price 10 cents Digitized by the Internet Archive in 2012 with funding from LYRASIS Members and Sloan Foundation http://www.archive.org/details/disclosuresonvarOOrobb 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 mani- fold for a plumbing system; a micro-adjuster provid- ing purely rectilinear motion; a miniature gear, flange and bearing puller, and a glass joint or stop- cock 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 VENT' 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 verti- cal axis of both legs and half-way up the length L of leg 10. Since the legs are free to flepc 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 trans latory 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 Ft j. 2 23 20 22 21 24> 3Z Tech. Note No. 253, November 30, 1964 4 A GLASS JOINT OR STOPCOCK PREVENTING CAPILLARY ACTION Robert Gary- Ground 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 posi- tioned 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. 253, November 30, 1964 5 The first stopcocks, made in early 1961, were fabricated by- grinding 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 Fiy.l 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: adjust- able 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 diam- eter 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 posi- tioned 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 _ GPO 883-483 PENN STATE UNIVERSITY LIBRARIES 111 ADOODTlfiMSbTE U.S. DEPARTMENT OF COMMERCE WASHINGTON. D.C. 20230 OFFICIAL BUSINESS POSTAGE AND FEES PAID U.S. DEPARTMENT OF COMMERCE