A Constant-velocity Universal Joint
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A UNIVERSAL joint said to give a riL constant-velocity output forms the
subject of patent No. 666,046, which Oarnes from W. E. Amberg, Beverly Shores, Indiana, U.S.A. The joint is
claimed also to be capable of functioning when the two members are axially displaced, that is, when their axes do not meet in the centre of the joint.
Both an exploded 'view and a cross section are illustrated.
The two end members are identical, and are separated by a middle part of unusual con struction. It consists of three diametrical levers, each carrying a pair of trunnioned rollers (I). One lever (2) forms a central hub on which the other two are journalled.
The lower drawing shows only the central one fitted, but the other two have their rollers spaced at other points in the circle. Lever 3 carries a pair of rollers (4) and lever 5 has similar ones (6).
The end members are slotted to embrace the rollers and transmit the
drive. Axial displacement is possible because the rollers can move radially in the slots, and radially along the trunnions. The patent goes thoroughly into the geometric analysis, and proves that the angular velocity must be constant.
ELECTRIC THICKNESS GAUGE lkiTECHANIZATION of gauging is a 1V1 growing practice and patent No.666,127 deals with means for checking the thickness of sheet steel. The patentee is Niles-Bement-Pond Co., West Hartford, Connecticut, U.S.A.
In the drawing the device is seen at work. The chief -feature is an electro-magnet (1) which approaches but does not touch the steel sheet (2) being gauged. Steel is mechanically fed under the magnet, and the air gap should remain constant if the sheet be true -to thickness.
Should it vary, "the changed air gap imbalances a bridge circuit and indicates the departure from standard on a large millivoltmeter, the dial of which can be directly calibrated in thousandths a3tt of an inch or finer. To enable the
original setting to be made accurately, the height of the magnet can be adjusted by a large mircrometer d:al (3).
The micrometer reading is held against accidental disturbance by means of a friction-ring which embraces the hub. The voltage of the balancing circuit may be 110.
MASTER CYLINDER HYDRAULIC BRAKE
. _ A DETAIL improve
ment in the design of master . cylinders comes in patent No. 665,810, from the Hydraulic Brake Company, Detroit, Michi gan, U.S.A. It refers specifically to the form of the replenishment valve.
The drawing shows the valve in detail in its closed position; this it occupies during the time the piston (1) is moved to the right. On the return of the piston, a rim (2) strikes the stem (3) of the valve and tiltsit sideways,thus allowing liquid to enter the system via port 4 leading to the reservoir. The valve-stem has a pointed end so that when it is inserted from above, there is no risk of it failing to tilt.
A RESILIENT WHEEL
rtA SPRING wheel employing rubber for the resilient medium is shown in patent No. 665,533 (Societa Applicazioni Gamma Antivibranti, Milan, Italy). The aim is to enable, in the limited space available, sufficient rubber to be used.
• The drawings show (top) a side view of part of the wheel and (bottom) a development on the rubber-block pitch circle. The hub member carries a number of radial arms (1) which are attached to-alternate rubber blocks (2). The other end of each block is fixed to a flange formed on a corrugated member (3) welded to the rim.
These arrangements are duplicated on the other side of the wheel, so that the assembly is in compressive equilibrium. This feature gives good rigidity in an axial direction yet freely permits of radial deflections.
EXHAUST GASES PASS THROUGH STEERING HEAD
DETAIL improvements in. the design Of .small thre6wheelers of the light delivery-van 'type are shown An patent , No. 665,508, by the Dot Cycle and Motor Mannfacturing Co., Ltd., and B. Wade, both of Arundel Street, Manchester, 15. The vehicle referred to has a tractive front wheel carrying the engine. With such a layout, the exhaust fumes are released in front. The patent shows a method of piping them to the rear.
:Dealing with the general layout, the engine (1), the tra-nsmission (2) arid the single front wheel (3) all swivel as -a unit about the steering head (4). Although the steering arrangements follow motorcycle practice, control isby means of a wheel which operates through a pair of bevels (5). The essence of the patent is the means for
, leading the exhaust gases through the steering head to ope of the frame ,tubes (6) which also functions as an exhaust
pipe. The gases reach the steering head via a pipe (7) from the engine.