Mechanical Model Kits -
Combined Drive
SLIDER-CRANK
MECHANISM
4Z4-018 Type: Combined
Drives
Drive illustrates basic method of converting rotation into reciprocation.
Crank-operated drive shaft pin-connected to connecting rod, which drives slider. Study of
displacements in mechanism facilitated by angular and linear scales mounted on unit.
Price: $41.82
MECHANICAL
DIFFERENTIAL
4Z4-023 Type:
Comined Drives
Device illustrates action of a bevel-gear differential. Input crank drives arm on
intermediate member (spider) engaging two output members, the average of the speeds of
which is controlled. Useful in demonstrating principles of differential action, such as
occurs in automobile differentials. Price: $151.58
LATHE DRIVE WITH LEAD
SCREW
4Z4-024
Type: Combined Drives
Drive illustrates principle of the drive of a metal-cutting lathe. Included are change
gears, lead screw, cylindrical work piece and pointer on compound rest simulating cutting
tool. Useful in studying relative motions and mechanical arrangements of a basic
metal-cutting machine. Price: $119.20
SHAPER MECHANISM
4Z4-025 Type: Comined Drive
Drive illustrates quick-return motion and work-feed arrangement used in shapers. Crank
drives eccentric, slotted link connected to reciprocating output motion (of shaping tool).
Second drive involves crank-and-rocker, ratchet clutch and lead screw in controlling
advance of work piece. Useful in studying basic arrangements and speed-relationships in
shaper drives. Price: $145.00
INCLINED-PLANE
DRIVE
4Z4-026 Type: Combined Drive
Drive illustrates conversion of translatory motion into perpendicular translatory
motion by means of an inclined plane or wedge. Geared, crank-operated drive shaft actuated
wedge mounted on horizontal dovetail slide. Wedge engages rollers on output member moving
on vertical dovetail slide at reduced speed depending on wedge angle. Linear scale on
output motion useful in studying speed relationships involved. Price: $99.31
VARIABLE-SPEED
FRICTION DRIVE
4Z4-044
Type: Combined Drive
Drive illustrates principle of an infinitely-variable speed transmission.
Crank-operated input shaft with keyed roller, slideably mounted on shaft, drives disc on a
perpendicular output shaft through frictional contact. Control of roller position obtained
by screw moving roller along keyway, thereby adjusting speed ratio. Price: $73.17
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
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
COMPACT TOOL KIT
4Z4-0ST
Five piece kit consisting of two screw drives and three wrenches. Price: $12.95
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