Spiral chute

- The Post Office
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Description

FIG. 1 is a front elevational view of a spiral chute showing our new design;

FIG. 2 is a side elevational view thereof; and

FIG. 3 is a top plan view thereof.

A portion of the spiral chute is shown broken away to indicate indeterminate length.

Referenced Cited
U.S. Patent Documents
D296489 June 28, 1988 Nair
803119 October 1905 Logan
973921 October 1910 Dodge
1256724 February 1918 Pardee
1784272 December 1930 Constable
1802089 April 1931 Pfeiffer
1928459 September 1933 Pardee
1959736 May 1934 Rademacher
3565226 April 1968 Winchester
3755878 September 1973 Henning
3976176 August 24, 1976 Kurtz et al.
4726456 February 23, 1988 Hogsett
Foreign Patent Documents
54248 April 1985 CAX
1370043 June 1963 FRX
59-227613 December 1984 JPX
Other references
  • "Conveyors and Related Equipment", A. Spivakovsky and V. Dyachkov, pp. 408-413.
Patent History
Patent number: D313298
Type: Grant
Filed: Mar 9, 1988
Date of Patent: Dec 25, 1990
Assignee: The Post Office (London)
Inventors: Cetin B. Elmas (Swindon), David Tolond (Pewsey)
Primary Examiner: Kay H. Chin
Law Firm: Merchant & Gould
Application Number: 7/165,896