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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 4586392 | Motion transmitting mechanism In a motion transmitting mechanism comprising a linearly moveable member (3) operating to and from an end stop, a compressible spring (9) is arranged between the linearly moveable member (5) and a supporting surface (10), whereby the spring is compressed ... | 05/06/1986 |
| 4564993 | Double nut and method of forming the double nut In a screw drive, in particular a ball screw drive, a double nut, formed of a pair of individual nuts, is tightened on a threaded spindle and the individual nuts are secured together against relative rotation by a locking member. The locking member is sec... | 01/21/1986 |
| 4528607 | Magnetic record/playback head positioning apparatus An apparatus for positioning magnetic record/playback heads in a floppy disk data storage and retrieval devices and including a carriage 12 upon which heads 14 and 16 are mounted, and a linear guidance mechanism comprising a fixed guide rod 18, a spring-l... | 07/09/1985 |
| 4509382 | Preloaded screw actuator An automotive vehicle power-actuated seat adjuster assembly includes a screw type height adjustment apparatus employing a nut held axially but rotatable under applied torque within spaced antifriction bearings, one of which bearings is an element molded o... | 04/09/1985 |
| 4498350 | Shifting mechanism A shift mechanism (66, 68, 70, 72) for shifting a member (22, 22A', 22B, 27C) for performing an operation at a preselected one of at least two spaced-apart operating positions. The mechanism comprises a threaded screw (10, 10A, 10B, 10C) that is rotated a... | 02/12/1985 |
| 4487087 | Ball nut having adustable preloading An improved ball nut having adjustable preloading comprises a pair of ball nut halves both in threaded engagement with a ball screw. Only one of the nut halves is secured to a movable machine member, the other nut half being movable to the relative fixed ... | 12/11/1984 |
| 4449417 | Carrier moving mechanism Disclosed is a carrier moving mechanism for preventing occurrence of the backlash between a screw shaft and a carrier transmitted by this screw shaft. This carrier moving mechanism comprises a screw shaft and a carrier having secured thereon first and sec... | 05/22/1984 |
| 4438986 | Ball screw assembly containing a ball spline unit for exact slow feed and power transmission mechanism comprising said ball screw assembly The ball screw assembly disclosed makes use of a shaft consisting of two parts, one of them being formed as a spline and the other one containng at least two screws spaced from one another at a predetermined distance, wherein the respective screws having ... | 03/27/1984 |
| 4434677 | Anti-backlash spring-mounted nut An anti-backlash nut construction wherein a base portion that is adapted to be carried by a machine part, has a bore through which a lead screw can pass. The nut has a threaded portion which is connected to said base portion and which has a bore matching ... | 03/06/1984 |
| 4392757 | Backlash and runout compensator for lead screw drives Disclosed is drive apparatus especially useful for controllably displacing the carrier of a printer, the drive apparatus including a lead screw having laterally spaced apart and floating threaded followers thereon. Intermediate the threaded followers are ... | 07/12/1983 |
| 4369011 | Preloaded ball screw assembly Ball nuts are preloaded onto a ball screw by rotating the nuts relative to one another to jam adjacent end faces of the nuts together. Thereafter, the nuts are held against relative rotation by tightening a clamping ring secured to one of the nuts and ada... | 01/18/1983 |
| 4353264 | Anti-backlash nut assembly An anti-backlash nut assembly is disclosed of the type which undergoes translational movement longitudinally along a screw in response to relative rotational movement between the nut and screw. The assembly includes a nut which is split into first and sec... | 10/12/1982 |
| 4294159 | Thread delasher in vehicle steering gear Power steering gear with integral rotary valve for directing hydraulic pressure fluid to and from a hydraulically actuated rack piston nut drivingly connected to an output and in which an internal spring device effectively reduces lash in the threaded con... | 10/13/1981 |
| 4292722 | Renewable nut for a lead screw drive and method of making same In a lead screw drive, such as that used in a lightweight lathe or milling machine for driving the workpiece relative to the cutting tool, the core of a drive nut is made of a material having a relatively low melting temperature, such as babbitt metal or ... | 10/06/1981 |
| 4274297 | Spindle drive mechanism with circulating balls A spindle and a spindle nut having external and internal threads, respectively, formed thereon and circulating balls operatively engaged between said threads operating to effect transmission of forces axially thereof when the spindle and spindle nut are r... | 06/23/1981 |
| 4249426 | Anti-backlash nut having longitudinal flexural members with ramps thereon and means to apply an axial pre-load force to said ramps An anti-backlash nut having one or more longitudinal flexural members with one end fixed and one end free-floating is disclosed which undergoes translational movement along a shaft. This anti-backlash nut is improved by providing ramps at the free-floatin... | 02/10/1981 |
| 4217813 | Power steering gear with delashed piston nut and screw threading Power steering gear with integral rotary valve for directing hydraulic pressure fluid to and from a piston nut and in which an elongated screw threaded through the piston nut is slit longitudinally to give the metallic screw a barrel-shape configuration w... | 08/19/1980 |
| 4177690 | Ball screw and nut A ball screw and nut mechanism in which a preloaded train of balls travels through a closed circuit having an active portion and an inactive or return portion. The active portion is formed by convolutions of opposed helical grooves in the screw and the nu... | 12/11/1979 |
| 4173907 | Device for transforming a rotational motion into a linear motion A device for transforming a rotational motion into a linear motion comprising a shaft and a sleeve enclosing the shaft, the shaft and sleeve adapted for relative axial movement upon relative rotation of the shaft and sleeve. A plurality of rolling bodies ... | 11/13/1979 |
| 4131031 | Anti-backlash nut assembly An anti-backlash nut assembly is disclosed of the type which undergoes translational movement along a screw in response to relative rotational movement between the nut and screw. The assembly includes a nut which is axially-split into first and second por... | 12/26/1978 |
| 4022076 | Anti-backlash automatically reversing nut for a diamond thread screw An anti-backlash, automatically reversing nut construction for use with a diamond thread screw, comprising a nut proper and a separate follower movable with respect to the nut proper, both said parts having through bores for receiving the screw. The follo... | 05/10/1977 |
| 4002083 | Balanced component operative with an associated shaft for relative positioning movement therebetween A component or balanced member for use on a shaft or lead screw having longitudinally extending transport elements has an internal bore with matching threads or lands therein to permit the balanced component to be mounted in operative association with the... | 01/11/1977 |
| 3975968 | Precision lead screw assembly and nut An improved precision lead screw and nut assembly, including an improved nut, includes a nondeformable screw member having a helical thread on the exterior thereof, the thread being formed by a rib having a crest, adjacent side walls, the rib defining a h... | 08/24/1976 |
