Hetchins Patent No. 443,454 — Curved Seat and Chain Stays, the Vibrant Rear Triangle (Applied 1934, Accepted 1936)

— Page 1 (specification) —
PATENT SPECIFICATION
443,454
Application Date: Nov. 20, 1934. No. 3317/ 34.
Complete Specification Left: Nov. 20, 1935.
Complete Specification Accepted: Feb. 28, 1936.
PROVISIONAL SPECIFICATION
Improvements in Construction of Cycle Frames
I HYMAN HETCHIN, of 798/800, Seven Sisters Road, Tottenham, London, N. 15, British, do hereby declare the nature of this invention to be as follows: –
The chain stays have a retarding bend starting 6½” from the bracket end turning down to 1¼” for 3½” and rising in a bend to 1¼”; the overall length for stays being 14¾”. The seat stays bend from the straight to 2″ outward, starting 3½” from fork end, overall length of seat stays being 21″. The object of this construction is to absorb shock from rear triangle.
Dated this 20th day of November, 1934.
H. HETCHIN.
PROVISIONAL SPECIFICATION
Improvements in Construction of Cycle Frames
I, HYMAN HETCHIN, of 798/800, Seven Sisters Road, Tottenham, London, N. 15, British, do hereby declare the nature of this invention and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement: –
My invention relates to the construction of cycle frames, particularly the seat stays and chain stays. Instead of these stays forming a straight line triangle with the seat tube, they are curved, thus more readily absorbing road shocks, normally transmitted through the bottom bracket and seat lug, without loss of rigidity.
The seat stay takes an outward curve or bead, commencing about three quarters down from the top of stay. The chain stay has a downward curve or bend from bracket end (B) falling 1½” in 5″ and (C) rising ½” in 3¾”. Both stay members are butted 2 gauges heavier than normal or standard gauges, making total thickness on bends 19 gauges which more than makes up for the loss of side rigidity which would come about by using ordinary gauge material for the stays.
So that my invention may be more readily understood, I will describe same with reference to the accompanying drawing in which Fig. (1) illustrates the seat stay, Fig. (2) the chain stay and Fig. (3) the stays assembled to the seat tube. The bend in Fig. (1) commences from point shown at A, starting 5″ from tapered end of stay and bending outwards for 1¾”, the bend in Fig. 2 beginning as shown at (B) and carrying on as shown at (C), the whole construction and assembly being illustrated in Fig. (3).
Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is: –
An improved construction of cycle frame, consisting of forming the parts known as the seat stays and chain stays curved out of the usual straight line, substantially as described and illustrated.
Dated this 20th day of November, 1935.
H. HETCHIN.
Leomington Spa: Printed for His Majestey’s Stationery Office, by the Courier Press. — 1936.
[Text page printed on tan paper. The Royal Arms, with lion and unicorn supporters, is printed in a black panel at upper left beside the heading block, with the patent number in large bold figures at upper right and a short rule under the three date lines. Two specifications follow, each under a centered heading and title and each set in two justified columns, with bold marginal line numbers at every fifth line (printed 5 to 60). The second is headed PROVISIONAL SPECIFICATION as set, although it carries the claim and the references to the drawing. Each closes with a centered date line and signature, and a rule sits above the printer’s line at the foot. There are no illustrations on this page.]

— Page 2 (drawing sheet) —
443,454 COMPLETE SPECIFICATION
1 SHEET
(This Drawing is a reproduction of the Original on a reduced scale.)
Fig. 1
A
Fig. 2
C
B
Fig. 3
A
C
B
Malby & Sons, Photo – Lith
[Drawing sheet printed on tan paper, with three line drawings inside a ruled border and the explanatory note set vertically up the left margin. Fig. 1, running diagonally from the upper right toward the lower left, shows a single seat stay: a long straight tube that curves near its lower end, with the start of the bend marked A. Fig. 2, across the lower part of the sheet, shows a single chain stay, open and larger at its right end, with a downward curve marked C and a rise marked B. Fig. 3, at center right, shows the rear triangle assembled. At the head of the seat tube is a seat lug with a pointed ornament, a binder ear with a bolt hole and a stub of top tube; at its foot is the bottom bracket shell with a stub of down tube. The seat stay and the curved chain stay meet at a hooked rear fork end and are lettered A, C and B to match the other two figures.]