A REMEDY FOR LOOSE CHAIR SCREWS

A new coiled-strip device is described which enables sleepers with enlarged holes to be used within conventional plugging and reboring. The coil is approximately 15/16 in. dia. x 3-1/2 in. long x 1/32 in. thick, and weighs about 1/10 lb. It is formed mechanically from straight strip. The steel mandrel is 5/8 in. dia., and has a short length of screw thread terminating abruptly. The head is similar to that of an R.B.S. chair screw. Its effective length of 6-1/2 in. is such that the coil is placed about 1/2 in. below the top of the sleeper, if it is screwed down until the mandrel head touches the ferrule, which is assumed to project 1/4 in. from the chair boss. When the mandrew is unscrewed, it disengages at once, leaving the coil embodied in the sleeper. The replacement of the chair screw expands the coil slightly. The operation can be repeated, to place a second coil inside the first one. The coils are delivered to the site ready for use, and it is the work of a moment to fit them on a mandrew. The remainder of the operation consists only of inserting or withdrawing chair screws, which can be done by machine.

• Corporate Authors:

  Temple Press Limited

  161-166 Fleet Street
  Longon EC4,   England 
• Publication Date: 1948-4-16

Media Info

• Features: Figures; Photos;
• Pagination: p. 466
• Serial:
  • RAILWAY GAZETTE
  • Volume: 88

Subject/Index Terms

• TRT Terms: Bolts; Fastenings; Railroad ties; Technology
• Geographic Terms: United Kingdom
• Subject Areas: Materials; Railroads;

Filing Info

• Accession Number: 00037930
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 4 1994 12:00AM