Por los antecedentes que acompaño me atrevo a sugerir que en este caso walking beam se refiere a un tipo de bisagra que podría denominarse "bisagra pivotante.

http://www.dkhardware.com/product-13137-9040wbp-walking-beam...
This CRL Walking Beam Top Pivot is a center-hung pivot that allows for adjustment in door clearance and door removal by raising or lowering a pivot pin. Designed to work with CRL Wedge-Lock® Door Rail Systems or any center-hung application where the top door rails have a depth of one inch (25 millimeter) and can accept a pivot pin diameter of 19/32 inch (15 mm). The pin has a full one inch vertical adjustment range to ensure solid contact and security. The walking beam top pivot will fit any standard aluminum, hollow metal or wood header when used with CRL9040MB mounting brackets. One set per package.

http://www.thefind.com/hardware/info-center-hung-top-pivot
For Center-Hung Applications Allows for Easy Door Removal and Adjustment This CRL Jackson Center-Hung Top Door Walking Beam Pivot with Cover Plate is for center hung doors. Made of high strength aluminum with a hardened pin. Supplied with screws and cover plate. Important Note: Not recommended for doors exceeding 125 lbs. This set includes the Top Pivot and Clear Aluminum Cover Plate only. This does not include the door arm portion. For a complete set see Cat No. CRL9040WBP and optional finished Cover Plates CRL9040CP (finish). The 213K and CRL9040WBP are not interchangeable.

http://inco.nu/catalogos/portiso.pdf
Pg.3 Bisagra para puerta pivotante