Şunu aradınız:: soleplates (İngilizce - İspanyolca)

rails, sleepers, fishplates, soleplates, joists, heavy sections 80 mm and over, sheet piling
carriles, traviesas, placas de asiento, bridas, viguetas, perfiles pesados y barras de 80 mm o más, tablestacas

this makes it ascend by means of the roller tracks with some soleplates, accumulating a potential energy. in the descent of the tray, the aforementioned energy is transformed into kinetic energy, reaching the design speed.
en el descenso de la bandeja, dicha energía se transforma en energía cinética, alcanzando la velocidad de diseño. la bandeja es bruscamente frenada por dos topes.

stainless steel soleplate with heating wire, for use in the manufacture of electric irons (1) [1]
placa de acero inoxidable con alambre termotransmisor destinada a la fabricación de planchas eléctricas [1]