together with the shaft 31 which they are penetrated by and mounted upright on therefore it not only offers high accuracy in positioning of such component parts but also greatly facilitate the assemblage unlike the present invention in the prior art the corresponding function is dependent on the height of the slotted horizontal plate 13 39 and the waned bosses therein thus the accuracy is liable to be influenced by both the slight error of sizes in production and the process in assembly line and results in its low accuracy liability of disordered combination and the more labor require in assemblge a further distinguishable specialty of this invention is that the combination changing can be performed by switch 11 whereas the prior case is operated by a combination changing rod 9 located on the under side of the lock however when practically equipped onto a suitcase the inside lining of the latter must be inevitably bored to allow the said combination changing rod protrude thereinto this is apparently a defect of the inside lining from the viewpoint of esthetics moreover extra care must be taken in the process of boring and sewing the inside lining to make the position of the hole and the protrudent combination changing rod coincident and increase the requisite labor and slow down the production considering the comparison the present invention and the prior case are thoroughly different whatever in the degree of security easiness of assemblage and practicality.