Mechanical Model Kits
The proven way to grasp even the most
complex mechanical motion principles.
 RACK AND GEAR JACK MECHANISM
4Z4-050
Type: Combined Drive
Mechanism illustrates the mechanical advantage obtained by the gear ratio involved.
Moderate loads placed on the top of the jack platform can easily be lifted by the
mechanism. A ratchet and pawl on the input shaft prevents the jack from descending under
the load. Price: $88.86
 SCOTCH YOKE DRIVE
4Z4-051 Type: Lever Mechanism
Drive illustrates one of a class of drives which convert rotary motion into
reciprocating motion. The output motion of the slider is harmonic and therefore this drive
is frequently employed when it is necessary to generate the sine function of the angle of
the crank in mechanical systems. Price: $41.82
 SLANTED SCOTCH YOKE DRIVE
4Z4-052 Type:
Lever Mechanism
Drive when used in conjunction with #51 illustrates the increased displacement of
the slide when the slot of the scotch yoke is at an angle with the axis of the slider. As
in #51, the motion of the slider describes the function of the sine of the driving crank
angle. Price: $41.82
 FRICTION RATCHET DRIVE
4Z4-053 Type: Friction
Drive
Drive illustrates the action of the friction ratchet coupled with the crank-and-rocker
drive. The output indicator will rotate only when the rocker arm is moving in one
direction due to the action of the friction ratchet. Center distance between the shafts
and the length of the floating link are adjustable to facilitate the analysis of this
drive. Price: $47.04
 SWINGING BLOCK LINKAGE
4Z4-057 Type: Combined Drive
Model is used to illustrate the basic concept of the quick-return mechanism. It is
a basic four-bar linkage, similar to the Slider-Crank Mechanism of Kit #18 with the
difference being that the slide bar is mounted on a plate free to rotate. Adjustment of
the position of the input shaft permits variation in the stroke. Price: $46.00
 BAND-BRAKE AND FLYWHEEL
4Z4-058 Type:
Combined Drive
The flywheel driven through a single-stage step-up gear system is connected to the
shaft through a friction clutch. When operated, the flywheel is set into motion and then
the band-brake applied by means of the operating lever. Model is useful in the study of
braking concepts. Price: $85.71
 DOUBLE-ACTING CLAW CLUTCH
4Z4-059
Type: Clutches
Model illustrates the principle of clutching and declutching in machine drives. The
clutches couple the input and output shafts through two gear pairs, thus the position of
the operating lever determines the speed ratio between the input and output shafts.
Indicator on the output shaft is useful in studying speed ratios and clutch action. Price:
$108.72
 COMPACT TOOL KIT 4Z4-0ST
Five piece kit consisting of two screw drives and three wrenches. Price: $12.95
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