I do believe this particular design of bicycle is referred to as a
Cross Frame/X-Frame Bicycle. Raleigh utilised this design of frame (as did many other manufacturers of the period) from 1900-1930, when they began to phase it out for more 'conventional' frame designs.
General X-Frame information":389lz93u said:
The special X formation used gives it the additional strength exactly where it is needed, and the machine readily stands up to the hardest of hard going.
Original Sales Ad.
Raleigh sales blurb circa. 1934":389lz93u said:
Note the specially constructed steel ‘X’ frame. This added strength will meet the demand of the hardest service it is possible to give to a bicycle. But throughout it will maintain its flexibility. Bearings are specially hardened and accurately ground to ensure silken running. Raleigh brakes are a revelation in their smoothness and efficiency, while Raleigh chrome plating and special rust-proof enamelling make the All Steel bicycle ideal for all-weather riding.
1934 Raleigh 'Irish Cross' Bicycle.