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Title: |
1892 Article-Riehlé Bros., Testing Machine |
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Source: |
American Machinist 11 Feb 1892 pg 3 |
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Insert Date: |
3/24/2020 12:30:54 PM |
A New Riehlé Testing Machine — The accompanying illustration represents a new type of standard testing machine of 300,000 pounds capacity, built by the Riehlé Testing Machine Company, Philadelphia. The design allows of a wide range of movement and character in testing, with simplicity of parts.
The chief new feature in this machine is the double adjustable power cross-head, by which the testing heads can be set at any convenient height, or distance apart, to suit the nature of the test or pleasure of the operator. In order to accomplish this, the outside columns, which have usually been of any suitable shape and proportions, have been constructed as vertical stationary screws of coarse pitch, and the large bronze nuts in the upper head travel up and down by means of a worm wheel cut on their peripheries, the worms which drive them being in turn driven by the sheave pulley and a reversing countershaft somewhat like that of a portable drill. In the case of the lower cross-head, the screws revolve in the nuts, which are keyed fast, and hence the head travels up and down on the screws, as controlled by the reversing lever. These movements are independent of each other, and can be in the same or opposite directions.
A machine recently furnished to the Toronto School of Practical Science was capable of crushing specimens 10 feet in length up to the capacity of machine; of exerting tensile stress on specimens 10 feet long with 3 feet of elongation, and of applying transverse bending stress on beams 18 feet between supports. The arrangement of gearing and clutch levers is such that eight different rates of speed can be easily obtained by convenient levers. This feature is very valuable where a wide range of materials with varying ductility are tested, and also to obtain the quick speeds of adjustment and the very slow application of power in compression.
There is a new quick lever device for engaging and disengaging the friction gearing, which is convenient. Friction pulleys are also used for driving. The traveling vernier poise of the beam has the counterweight made to do double duty as a standard weight, and is lifted in much the same manner as on the emery machine. The gears are all cut, and the machine runs very smoothly and quietly. The cross-heads are made of steel, and the best material is employed throughout.
The rapid growth in the demand for practical tests as opposed to theoretical computations is shown by the exact specifications, more particularly of the government and railroad companies, and the increasing demand for all kinds of testing machines, and the present tendency is strongly in the direction of testing full-sized specimens. |
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1892 Riehlé Bros., Testing Machine
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