Did You Know...
...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 8141448 | Ball spline First shoulder portions are formed on the outer periphery of the shaft such that the first spline grooves are interposed between the first shoulder portions adjacent to each other in a circumferential direction of the shaft. Second shoulder portions are formed on th... | 03/27/2012 |
| 8020462 | Ball screw/nut type linear actuator A ball screw/nut type linear actuator (1) where a ball nut (32) moves in forward-backward directions by rotation of a ball screw shaft (31) connected to a motor (22), wherein the ball screw shaft (31) is connected and fixed, in a s... | 09/20/2011 |
| 7712390 | Ball type speed reducer device Among six follower balls (5) aligned on the input shaft (7), the two balls (5) situated on one end side (A) always engage tightly with one engagement surface (10a), while the other two balls (5) situated on the other end sid... | 05/11/2010 |
| 7578214 | Preload structure for a ball screw A preload structure for a ball screw in the inner surface of a nut is formed a helical groove whose lead is different from the lead of the adjacent helical groove to produce a lead deviation between the helical groove of the nut and the helical groove of the screw. ... | 08/25/2009 |
| 7389709 | Reverse transfer system ball-screw, and electro-mechanical actuator employing same An electro-mechanical actuator (21) includes a reverse transfer system ball-screw (20). The actuator broadly includes a frame (22), a nut (43) mounted on the frame, at least one magnet (59) mounted on the nut, at least one coil ( | 06/24/2008 |
| 7281604 | Electric power steering apparatus An electric power steering apparatus for converting rotation of a steering assist motor into movement of a steering shaft in the axial direction thereof in accordance with steering operation using a ball screw mechanism wherein a female thread groove formed around a... | 10/16/2007 |
| 7267616 | Method for making a ball-nut and method for making a ball-screw A method for making a ball-nut includes cutting a 360-degree closed-loop surface groove in the inner-circumferential wall portion of a ball-nut body using a whirling-type internal-diameter cutting machine. The closed-loop surface groove surrounds the longitudinal ax... | 09/11/2007 |
| 7107805 | Method for the production of a spindle nut of a spherical thread drive mechanism Method for the production of a spindle nut (3) of a spherical thread drive mechanism, whereby the spindle nut (3) has at least one screw-shaped track (4) formed as a single piece on its inner circumference, whose threads (38) are limited ... | 09/19/2006 |
| 7044017 | Roller screw system A higher efficiency roller screw system that includes a nut body designed to engage a threaded shaft. The nut body includes a center bore with closed, partial helical grooves formed therein. Disposed inside the center bore is a shaft with open helical threads formed... | 05/16/2006 |
| 6983669 | Ball screw mechanism with integral opposing thread A ball screw mechanism has an opposing thread provided by an integral male thread formed at one end of a nut received on the screw. The male thread is of a smaller form than the female thread on the screw so as to not normally be in contact therewith, but should ay ... | 01/10/2006 |
| 6978693 | Ball screw The invention is a ball screw, comprising: a shaft having a spiral-shaped shaft; a nut having a spiral-shaped nut ball groove and screwed with the shaft via a plurality of balls; and a ball circulation passage for raking the plurality of balls at one end of the ball... | 12/27/2005 |
| 6973990 | Electronic control power steering device An electric power steering apparatus (11) includes a reduction mechanism (G) for transmitting the rotation of a rotating shaft (28a) of a motor (28) to a ball screw nut (20) while reducing the speed of the rotation. The reduction m... | 12/13/2005 |
| 6880421 | Rolled ball screw and method for rolling ball screw groove A rolled ball screw has a screw shaft having a ball screw groove so as to engaging with rolling elements of a ball screw, the screw shaft is formed by rolling while a thread rolling die is pressed against a cylindrical bar-shaped member to thereby roll the ball scre... | 04/19/2005 |
| 6875006 | Threaded drive The invention relates to a screw mechanism comprised of a screw shaft (1), a screw nut (2) and rolling bodies. When the screw mechanism is subjected to a high static load, the forces are transmitted from the screw shaft (1) to the screw nut (... | 04/05/2005 |
| 6848557 | Clutch actuator unit A clutch actuator unit comprises a housing (8, 9), a screw mechanism and an actuator head which at one end engages the screw mechanism (1, 2) and at the other end has an actuating end (18), which actuator head (16) can be displaced in axi... | 02/01/2005 |
| 6810985 | Steering device for a vehicle A steering device for a vehicle includes an electric motor. A drive element pertaining to the electric motor acts directly upon a connecting rod via a gear and a helical gear. ... | 11/02/2004 |
| 6776063 | Ball screw In the ball screw, a ball circulation tube 20 is formed to have such a shape that the movable amount of balls 15 in a first direction (X) intersecting at right angles to the axis of the tube 20 is larger than the movable amount of the balls 1... | 08/17/2004 |
| 6761080 | Multiple stage, multiple extend, speed reducing ball screw linear actuator and method of constructing and operating the actuator A multiple extend ball screw and nut linear actuator incorporates a revolvable axially restrained ball screw with a ball nut thereon. A constant speed reversible drive revolves the screw to move the ball nut forwardly and rearwardly. External helical threads of the ... | 07/13/2004 |
| 6708577 | Ball screw shaft with increased vibration frequency and improved vibration dissipation A ball screw shaft, with increased vibration frequency and improved vibration dissipation, having a longitudinal cylindrical internal cavity, closed at its ends by means of inserted terminals or plugs, has in said cavity a filling of granular material with low densi... | 03/23/2004 |
| 6702060 | Electric power steering apparatus An electric power steering apparatus comprises a ball nut rotationally driven by an electric motor through a gear train and having a female thread groove formed in the inner periphery thereof, a rack shaft disposed through the ball nut on the axis thereof... | 03/09/2004 |
| 6668673 | Ball screw with ball retainer cage A ball screw with ball retainer cage equipped between the screw bolt and the nut body is disclosed. The adjacent balls can move without squeezing each other and well protected in the retainer cage from dropping off therefrom when the retainer cage is disi... | 12/30/2003 |
| 6655228 | Dual directional power feed The present invention discloses a dual directional power feed for use with handheld drills or stationary frame mounted power sources. The device comprises a housing, two pairs of wheel bearings rotatably mounted to the housing, a cap rotatably mounted to ... | 12/02/2003 |
| 6516680 | Power steering apparatus A power steering apparatus comprises a rotary cylinder supported with its movement in the axial direction restrained and rotated coaxially with the steering shaft by the force a transmitted from the motor for assisting steering, a plurality of feed rings ... | 02/11/2003 |
| 6481305 | Roller screw and roller screw roller arranging method In a roller screw, a plurality of rollers 16 interposed between a nut member 14 and a screw shaft 12 are composed of a forward-motion load roller group 17, the rollers 16 of which are arranged in such a manner that the center lines thereof are set at a gi... | 11/19/2002 |
| 6334370 | Ball screwed nut, linearly guiding apparatus using the same, ball screw for steering and method of manufacturing the ball screwed nut A ball rolling groove 1c is defined in an inner peripheral surface of A ball screwed nut 1 by a rolling process, not by a grinding process so that a ball screwed nut having small diameters or large leads can be manufactured. The surface of the ball rollin... | 01/01/2002 |
| 6276223 | Motor-operated cylinder A motor-operated cylinder is provided, wherein the rotational movement of the output shaft of a motor is converted into a linear movement by a thread mechanism 3, with the least possible load applied to the thread mechanism 3 when an object starts to be m... | 08/21/2001 |
| 6082210 | Ball connecting body and ball screw apparatus using the same A ball connecting body in which a multiplicity of balls are arranged in a line at a predetermined interval and in a freely rotating manner. The ball connecting body is installed and used in a ball endless track of a ball screw apparatus in which a screw s... | 07/04/2000 |
