Manual of U.S. Patent Classification
as of June 30, 2000

Class
074
MACHINE ELEMENT OR MECHANISM

Class definitions may be accessed by clicking on the class title, above.
Subclass definitions may be accessed by clicking on the subclass number, below.

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Subclass		Title
ClassTitle		===> MACHINE ELEMENT OR MECHANISM
1R		MISCELLANEOUS
1SS		. High frequency vibratory devices
1.5		ESCAPEMENTS
2		AUTOMATIC OPERATION OR CONTROL (E.G., TRIPS)
3		. Speed controlled
3.2		. . Valve gear trips (e.g., steam engine "Corliss" type)
3.5		. Retarded
3.52		. . Plural, sequential, trip actuations
3.54		. . Clock train
3.56		. . . Winding knob trip (e.g., alarm mechanism)
4		. Hit and miss
5R		GYROSCOPES
5.1		. With caging or parking means
5.12		. . Rotor spin and cage release type
5.14		. . And resetting means
5.2		. With gimbal lock preventing means
5.22		. Combined
5.34		. Multiple gyroscopes
5.37		. . With rotor drives
5.4		. Gyroscope control
5.41		. . Erecting
5.42		. . . By plural diverse forces
5.43		. . . By jet
5.44		. . . By weight
5.45		. . . By friction
5.46		. . . By magnetic field
5.47		. . . By motor torque
5.5		. . Damping
5.6R		. With pick off
5.6A		. . Optical
5.6B		. . Pneumatic
5.6C		. . Conducting liquid
5.6D		. . Electrical
5.6E		. . Electrical and magnetic
5.7		. With rotor drive
5.8		. Vertical gyroscopes
5.9		. Horizontal gyroscopes
5F		. Flexure hinges for gyros
6		ENGINE STARTERS
7R		. Automatic
7A		. . Separate power mesher
7B		. . Holders
7C		. . Clutch connection
7D		. . Worm and wheel
7E		. . Reduction gearing
8		. Radial meshing
9		. Cam operated
10R		SHAFT OPERATORS (RADIO TUNER TYPE)
10.1		. Preselected position
10.15		. . Step by step
10.2		. . Rotatable stop and projectable abutment
10.22		. . Digital dial type
10.27		. . Plural operator
10.29		. . . Cam and follower
10.31		. . . . Adjustable cam
10.33		. . . . . Sliding operator
10.35		. . . . Adjustable follower
10.37		. . . . . Sliding operator
10.39		. . . Rack and pinion
10.41		. . With detent or clicker
10.45		. Plural shafts
10.5		. Plural speed
10.52		. . Planetary
10.54		. . Separate operators
10.6		. Cam and follower
10.7		. Tensioned flexible operator
10.8		. Gear drive
10.85		. . Worm or screw
10.9		. Lever and linkage drive
10A		. Remote control
813R		ROTARY MEMBER OR SHAFT INDEXING, E.G., TOOL OR WORK TURRET
814		. With safety device or drive disconnect
815		. With locating point adjusting
816		. Preselected indexed position
817		. . Sequential
818		. . . Skip position
819		. . . Held by torque
820		. . . Geneva or multilated gear drive
821		. . . Velocity control
822		. . . Interlocked rotator and brake
823		. . . . Diverse-type brakes
824		. . . . . With axially acting friction brake
825		. Plural operators or input drives
826		. With means to axially shift shaft
827		. Single revolution input effects desired fractional output
813C		. Control means
813L		. Locking means
11		POWER TAKE-OFF
12		. Speedometer
13		. Wheel take-off
14		. . Wheel bed type
15		. . Supported pulley
15.2		. Plural take-off shafts
15.4		. With independent change speed gearing
15.6		. From shaft extension
15.63		. . Prime mover shaft, e.g., crank shaft
15.66		. . Change speed transmission shaft
15.69		. . Vehicle propeller shaft
15.8		. Intermediate ends of power transmitting line
15.82		. . Vehicle propulsion transmitting line
15.84		. . . Between prime mover shaft and transmission
15.86		. . . Drive from transmission gear
15.88		. . . Between transmission and propeller shaft
16		POWER TABLES AND STANDS
17		WASHER AND WRINGER
17.5		FULL STROKE MECHANISM
17.8		MOTION TRANSFER THROUGH IMPERFORATE FLEXIBLE SEAL
18		FLEXIBLE SEALING DIAPHRAGM ATTACHED TO MOVING ROD AND TO CASING
18.1		. Pivoting or nutating rod
18.2		. Longitudinally reciprocating rod
828		ALTERNATING-MOTION DRIVEN DEVICE WITH MEANS DURING OPERATION TO ADJUST STROKE
829		. Constant length stroke with means to displace end limits
830		. . Cyclical displacement responsive to the alternating-motion
831		. Stroke adjustable to zero and/or reversible in phasing
832		. . Plural driving means to jointly drive the driven device
833		. . Device driven from selected points on oscillating link
834		. . Driving lever with adjustable pivot point
835		. . Eccentric and strap drive, shiftable eccentric
836		. . . Changing the extent of eccentricity
837		. . Crank pin drive, shiftable pin
838		. . Cam and follower drive
839		. . . Axial-type cam (e.g., wabbler type)
840		ROTARY DRIVEN DEVICE ADJUSTABLE DURING OPERATION RELATIVE TO ITS SUPPORTING STRUCTURE
841		. Screw and nut adjusting means
842		. Rack and pinion adjusting means
		MECHANICAL MOVEMENTS
20		. Oscillating to reciprocating and alternating rotary
21		. Oscillating to reciprocating and intermittent rotary
22R		. Rotary to reciprocating and rotary
22A		. . Rotary to reciprocating or rotary
23		. Rotary to reciprocating and alternating rotary
24		. Rotary to reciprocating and intermittent rotary
25		. Rotary to or from reciprocating or oscillating
26		. . Head motions
27		. . Reciprocating carriage motions
28		. . . Phonograph type
29		. . Rack and pinion type
30		. . . Shifting rack
31		. . . Shiftable pinion
32		. . . Segmental pinion
33		. . . Alternately rotated pinion
34		. . . Clutchable gears
35		. . . . Bevel
36		. . Overcoming dead center
37		. . Belt or chain carried member
38		. . Crank, lever, toggle, and slide
39		. . Crank, lazy-tong, and slide
40		. . Crank, pitman, lever, and slide
41		. . . Pump jack type
42		. . Crank, pitman, and lever
43		. . . Multiple levers
44		. . Crank, pitman, and slide
45		. . Crank, lever, and slide
46		. . . Rack connections
47		. . Crank and lever
48		. . . Slidable connections
49		. . Crank and slide
50		. . . Slidable connections (e.g., scotch yoke)
51		. . Crank and multiple pitmans
52		. . Planetary gearing and slide
53		. . Cam, lever, and slide
54		. . Cam and lever
55		. . Cam and slide
56		. . . Axial cam
57		. . . . Grooved
58		. . . . . Multiple screw
59		. . . . . Alternately rotated screw
60		. . . Wabbler type
61		. . Unbalanced weights
62		. . Trammel-pitman
63		. Rotary to rotary
64		. . Inertia or centrifugal transmitters
65		. . Crank, pitman, lever, and crank
66		. . Crank, lever, and crank
67		. . Crank, pitman, and crank
68		. . Cranks, link connected
69		. . Cranks, slidable connections
70		. Rotary to alternating rotary
71		. . Mangle connections
72		. . . Shiftable driven gear
73		. . . . Central teeth
74		. . . Multilated gearing connections
75		. . Crank, pitman, and lever
76		. . Reciprocating rack connections
77		. . . Crank and pitman actuator
78		. . . Simple crank actuator
79		. . Oscillating rack connections
80		. . . Mangle actuated
81		. . . Crank and pitman actuator
82		. . Flexible connector type
83		. . Associated inertia devices
84R		. Rotary to intermittent unidirectional motion
84S		. . Space machines
86		. Rotary to gyratory
87		. . Unbalanced weight
88		. Reciprocating or oscillating to intermittent unidirectional motion
89		. Reciprocating or oscillating to or from alternating rotary
89.1		. . Including inertia device
89.11		. . . With rack and pinion
89.12		. . . . Rectilinear rack
89.13		. . Including bevel gears
89.14		. . Including worm
89.15		. . Including screw and nut
89.16		. . Including spur gear
89.17		. . . With rack
89.18		. . . . Curvilinear rack
89.19		. . . . . With biasing means
89.2		. . Including flexible drive connector (e.g., belt, chain, strand, etc.)
89.21		. . . With sprocket wheel
89.22		. . . With pulley
96		. Oscillating to oscillating
97.1		. . Snap action
97.2		. . . Plate spring
98		. . Geared connections
99R		. Reciprocating to or from oscillating
100.1		. . Snap action
100.2		. . . Plate spring
101		. . Compound lever and slide
102		. . Lever and slide
103		. . . Straight line motions
104		. . . Slidable connections
105		. . . Link connections
106		. . . Toggle transmissions
107		. . . Cam connections
108		. . . Flexible connections
109		. . Rack and pinion
99A		. . Inclined ramp
110		. Reciprocating to reciprocating
111		MECHANICAL MOVEMENTS (INTERMITTENT GRIP TYPE)
112		. Rotary to intermittent unidirectional motion
113		. . Automatically controlled
114		. . . Speed
116		. . Rotary crank or eccentric drive
117		. . . Adjustable
118		. . . Lever transmitter
119		. . . . Adjustable leverage
120		. . . Rack and pinion transmitter
121		. . . . Adjustable throw
122		. . . Rotary cam drive
123		. . . . Adjustable throw
124		. . . . . Radial cam
125		. . . . Radial cam
125.5		. . Intermittently engaged clutch
126		. Oscillation or reciprocation to intermittent unidirectional motion
127		. . Screw and nut devices
128		. . Slide actuator
129		. . . Multiple acting
130		. . Rack actuator
131		. . . Multiple acting
132		. . . . Inwardly facing racks
133		. . . Oscillating
134		. . . . Multiple acting
135		. . . . . Inwardly facing racks
		. . Strap actuator
136		. . . Multiple acting
137		. . . . Spring or weight return
138		. . . Single acting
139		. . . . Engine starter type
140		. . . . . Spring or weight return
141		. . . . Spring or weight return
141.5		. . Lever actuator
142		. . . Rotary driven element
143		. . . . Multiple acting
144		. Grip units and features
145		. . Compound movement handle
146		. . . Reversible
147		. . . Transverse pivots
148		. . Gripper releasing devices
149		. . . Power pawl lifter
150		. . . . Automatic
151		. . . . . Idle stroke
152		. . . . . . Cooperating holding pawl
153		. . . . . Power stroke
154		. . . . Cooperating holding pawl
155		. . . Holding pawl lifter
156		. . Gripper mountings, lever
157		. . . Reversible
158		. . . Multiple acting
159		. . . . Single ratchet or clutch
160		. . Gripper mountings, slide
161		. . . Multiple acting
162		. . Grip features
163		. . . Driving band
164		. . . . Clamping
165		. . . Driven band and gripper
166		. . . . Positive grip
167		. . . Driving ratchet-bar or rack
168		. . . . Multiple acting
169		. . . Driven ratchet-bar and power dog
625		ALTERNATE MANUAL OR POWER OPERATORS
640		GEARING
650		. Nonplanetary gearing differential type (e.g., gearless differentials)
655		. Single gearing unit includes fluid drive
661		. Plural prime movers selectively coupled to common output
664		. Plural power paths from prime mover
665R		. Plural power paths to and/or from gearing
670		. . Alternate input connections single hand crank
718		. . Fluid drive divides or combines alternate paths
720		. . One path includes fluid drive
721		. . Friction-type gearing
724		. . Worm-type gearing
665A		. . Single driven plural drives
665B		. . . Parallel
665C		. . . Nonparallel
665D		. . . Aligned
665E		. . . Parallel and aligned
665F		. . Single drive plural driven
665G		. . . Parallel
665GA		. . . . Spur
665GB		. . . . Bevel
665GC		. . . . Spur and bevel
665GD		. . . . Helical
665GE		. . . . Belt or chain
665H		. . . Nonparallel
665S		. . . Aligned
665T		. . . . Vehicle
665K		. . . Concentric
665L		. . Plural drivers plural driven
665M		. . . Bevel
665N		. . . Spur
665Q		. . Alternate drivers and driven
665P		. . Miscellaneous (plural power paths)
730.1		. With fluid drive
731.1		. . Condition responsive control
732.1		. . With one or more controllers for gearing, fluid drive, or clutch
733.1		. . . With interrelated controls
745		. In series plural interchangeably locked nonplanetary units
810.1		. Reversal of direction of power flow changes power transmission to alternate path
810.2		. . Input and output exchange functions
216.3		. Toothed gear and recirculated unconnected elements
318		. Alternating rotary or continuous
319		. Alternating rotary
320		. . Progressive
321		. . Shiftable and/or slidable gears
322		. . Clutchable gears
323		. . . On single driven member
324		. . . On single driving member
325		. Interchangeably locked
329		. . Disconnectable counter shaft
330		. . Multiple concentric clutch shafts
331		. . Plurality of counter shafts
332		. . Internal-external gears
333		. . Combined gear and clutch
334		. . . Preselector
335		. . Control mechanism
		. . . Automati