Class 475/266 - Stepped, torque responsive ratio change

Subclass of Class 475 - Planetary gear transmission systems or components
Definition: Subject matter wherein a plurality of distinct speed ratios* are
No. of patents: 32
Last issue date: 04/22/2008

Number	Title	Issue Date
7360607	Hand-held power tool with a torque-limiting unit A hand-held power tool has a motor output shaft, a tool driver, a torque-limiting unit with which a maximum torque transferred from the motor output shaft to the tool driver is adjustable by an operator; an actuating element that adjusts the torque-limiting unit, an...	04/22/2008
7350592	Hammer drill with camming hammer drive mechanism A reciprocating drive mechanism for a striker in a hammer, a rotary hammer, or a power drill having a hammer action, includes a sinusoidal cam channel formed on a drive member and a cam follower, in the form of a ball bearing, attached to a driven member which, due ...	04/01/2008
7334646	Electric power tool with improved speed change gearing A battery-operated driver-drill (1) includes an epicycle reduction gear unit (8) which encases a switchover sleeve (26) having inner teeth (27) and outer teeth (28). The gear unit (8) is rotatably mounted on second and third...	02/26/2008
7318691	Tool apparatus for milling machine The present invention provides an automated-torque controlled tool for attachment to a milling machine. The tool comprises an elongated hollow housing defined by a neck section, a middle section, and a bottom section. The neck section is adapted to engage a spindle ...	01/15/2008
7316628	Two speed transmission and belt drive system A two speed transmission comprising a planetary gear train comprising an input member connected to an input carrier, the input carrier connected to an input shaft, a sun gear and a ring gear, the input carrier comprising a plurality of planetary members each in mesh...	01/08/2008
7220211	Multispeed power tool transmission A multi-speed transmission assembly for a rotary power tool. The transmission assembly includes a plurality of transmission stages, with at least two of the transmission stages employing a movable reduction element that permits the transmission stage to be operated ...	05/22/2007
7121361	Electric power tool with improved speed change gearing A battery-operated driver-drill (1) includes an epicycle reduction gear unit (8) which encases a switchover sleeve (26) having inner teeth (27) and outer teeth (28). The gear unit (8) is rotatably mounted on second and third...	10/17/2006
7121973	Methods and apparatus for minimizing backlash in a planetary gear mechanism A planetary gear system includes a planetary gear assembly having a first planetary gear, a second planetary gear rotatable relative to the first planetary gear, and a torquing mechanism. The torquing mechanism generates a torsional spring force of the planetary gea...	10/17/2006
7118507	Automatic reduction-ratio changing apparatus An automatic reduction-ratio changing apparatus comprises a planetary gear mechanism including a sun gear, planet gears, and an internal gear. When a load, which exceeds a predetermined torque, is applied to the internal gear, a pawl of a lock lever is engaged with ...	10/10/2006
7062980	Bicycle shift control device with decreased stress during shifting A control apparatus is provided that facilitates the operation of a component that is subjected to stress from a stress-inducing component. The apparatus comprises an operation sensing unit that senses when the component should be operated; a stress reducing unit th...	06/20/2006
6824491	Power transmission device with automatic speed switching mechanism A power transmission device that is capable of automatic speed switching according to external load is disclosed, including a frame in which a transmission mechanism and a torque feedback mechanism are received. The torque feedback mechanism includes a torque resist...	11/30/2004
6758783	Automatic speed shifting device An automatic speed shifting device includes a frame having a transmission device and a torque feedback device received therein. The torque feedback device has a torque resistant member so that when the load torque is smaller than its resistant torque, the speed redu...	07/06/2004
6558288	Internal transmission device with automatic shift mechanism for a bicycle An internal transmission device for a bicycle. The device includes a slave member, a driver, a planetary gear mechanism disposed between the driver and the slave member, and an automatic shift control mechanism actuated relative to a rotational angle of t...	05/06/2003
6354980	Automatic transmission systems for humanly powered vehicles A shiftable bicycle transmission (30) is automatically shifted by automatically sensing output power torque of the transmission (30) automatically converting sensed output power torque to transmission shifting motion, and automatically shifting the shifta...	03/12/2002
6155952	Method for effecting a ratio shift and transmission device for implementing same A clutch engaged by means of flyweights and a spring directly meshes an input sun gear and an output planet gear carrier. When engagement pressure is insufficient for torque to be transmitted, a crown wheel slows down and is stopped by a free wheel, while...	12/05/2000
5897454	Automatic variable transmission for power tool An automatic transmission (30) for a power tool includes reduction gearing (42-58) coupled between a motor (24) and an output member (28). A mechanism for adjusting speed (60) of the output member (28) is coupled with the reduction gearing (42-58). The me...	04/27/1999
5514044	In-series automatic transmission modules directly responsive to torque The transmission apparatus comprises serially mounted two-speeds modules. Each module is responsive to speed and torque for shifting up when speed is relatively high and/or torque relatively low, and for shifting down in the contrary case. Speed sensitivi...	05/07/1996
5263906	Mechanical automatic transmission directly responsive to torque A multi-speed mechanical automatic transmission has two planetary gear trains, each including a sun gear, planet gears mounted in a planet carrier, and a ring gear. The first planetary gear train provides low gear and direct drive; the second train modifi...	11/23/1993
5083990	Two-speed power transmission for a power tool A two-speed power transmission for a power tool comprises a housing (10), an input shaft (20), an output shaft (15), a planetary gear (18) and a torque responsive gear shift mechanism (19) for directing torque through the planetary gear (18) in a high tor...	01/28/1992
4898249	Rotary electric tool A rotary electric tool in which a differential gear mechanism is mounted within a gear case fixed to a housing for example; projections are formed on the outer peripheral surface of an internal gear of a final planetary gear mechanism in the differential ...	02/06/1990
4892013	Variable speed gearing in rotary electric tool A variable speed gearing apparatus for a rotary electric tool, including a differential gear mechanism for being mounted within a gear case, an intermediate gear and a clutch mechanism, a final planetary gear mechanism having internal gear with projection...	01/09/1990
4869139	Rotating driver with automatic speed and torque switching A driver with automatic speed and torque switching including two different drive trains which operate in parallel and are driven at the same time by a motor. One drive train provides a high-speed output while the other provides a low-speed output. A singl...	09/26/1989
4869131	Variable speed gearing in rotary electric tool A differential gear mechanism is mounted within a gear case fixed to a housing, an intermediate gear and a clutch mechanism are disposed on at least one output side, and a rotation changes for changing over the rotation of both output shafts between synch...	09/26/1989
4858494	Torque responsive automatic shifting hub A torque responsive five-stage automatic shifting hub utilizes inner wrapped spring clutches to rotate a plurality of co-axial cylinders except for the cylinder at one end of the axis rotated by a sprocket. Gearing is interposed between the cylinders to r...	08/22/1989
4840091	Transmission shift mechanism Disclosed is a mechanism in a motor vehicle for hydraulically selecting the gears of an automatic transmission. The mechanism is a valve connected to a pressure source and having two sets of outlet ports, one set controlled by a manually operated linkage....	06/20/1989
4834192	Two-speed power tool A two-speed power tool having a rotation motor supported in a housing (10) and driving an output spindle via three planetary reduction gears (13, 25, 22). The ring gear (17) of a first planetary gear (13) is rotatable relative to the housing (10) as well ...	05/30/1989
4729260	Two speed gearbox A two speed gearbox comprises an input shaft, an output shaft and a reduction gear mechanism, such as an epicyclic gear mechanism, having high speed low torque and low speed high torque output drives. A dog clutch connects the high speed output drive to t...	03/08/1988
4649774	Reversible torque converter The invention relates to a reversible torque converter which is intended as a auxiliary device for use in connection with pneumatic, electric and/or hand-operated tools or machines, or which is intended to be incorporated in such machines and tools as an ...	03/17/1987
4614134	Overload protection system for planetary gear drive A gearing unit with planetary gearing stages employs a load sensor and a clutch for disengaging drive through the gearing should the sensor detect overloading. The load sensor is in the form of a stationary pin provided with a strain gauge transducer easi...	09/30/1986
4513827	Rotary tool The rotary tool contains a gear portion (16) whose input shaft (26) is driven by a hydraulic motor. The input shaft (26) is coupled with the output shaft (31) via an overload clutch (35,36,42) to ensure that with a low load, the transmission ratio is 1:1....	04/30/1985
4215594	Torque responsive speed shift mechanism for power tool A power tool speed shifting mechanism includes a planetary gear set wherein the ring gear is connected to the driven member of a torque responsive disengageable clutch. The driving clutch member is keyed for rotation with the sun gear of the planetary gea...	08/05/1980
3978742	Epicyclic gear assemblies An epicyclic gear change assembly capable of giving a planetary ratio and direct drive and having first means for frictionally connecting two members of epicyclic gearing together for direct drive and second means for positively connecting two members of ...	09/07/1976

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Class 475/266 - Stepped, torque responsive ratio change