File:Cassier's magazine (1911) (14761134064).jpg

Identifier: cassiersmagaz401911newy (find matches)
Title: Cassier's magazine
Year: 1891 (1890s)
Authors:
Subjects: Engineering
Publisher: New York Cassier Magazine Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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Text Appearing Before Image:
ing plat-form. What has occurred at the topis merely the reverse of what tookplace at the bottom. In respect to the relative movement between con-tacting parts of consecutive steps, theadjustments and forms are such asto avoid a tendency to grasp smallarticles or clothing. The one surfacemerely slips slowly past the other,,the joint being very minute. The moving steps at their endsslide next the smooth surfaces of thewooden wall which forms a kind ofbalustrade. The joints here are alsovery perfect, and for similar reasons.To secure such results requiresmerely perfection of workmanship,and this it is very possible to get. It is very important that the esca-lator be constructed with accuracyand skill both within and without.The escalator is indeed a convevor,but it is more. It must be an evenly-running piece of mechanism. This i >*.- $& jf — r ^ 1 ffPSSBjjBtti ^^3f-^^ 1 Ik ml B^- I in -*sm t—-»iii ilSl^1 \~^^ I y it. i % ! ESCALATOR IN A DEPARTMENT STORE i66 CASSIERS MAGAZINE
Text Appearing After Image:
THIS SHOWS THE MECHANICAL DETAILS OF AN ESCALATCI calls for great perfection of work-manship, particularly with regard to the chain by which it is driven. Inorder to maintain stability and exacthorizontality of the steps, a number ofimportant dimensions must be keptvery close to standard. The method of insuring the proper movement of the steps is quite inter-esting. In the first place, all thesteps are strung together to form anendless chain. One-half or more isalways out of sight. Each step is car-ried on four wheels, two at each end.The wheelbase from front to back is6 inches longer than the tread. The VERTICAL TRANSPORTATION 167 object of this is to secure greatstability. Some such provision isnecessary, because the load on a treadis very liable to unsymmetrical dis-tribution. Especially on the inclinethe four wheels are each providedwith what is in effect a separate rail.The rails corresponding to the for-ward wheels of a step are situatedahead of those corresponding to therear whe

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