Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 4417489 | Method and apparatus for machining a workpiece by varying the tool geometry A method and apparatus for machining a workpiece to perform several functions including sensing tool wear, enhancing tool life, tool wear compensation, cutting a workpiece having two different materials joined at a boundry, and suppressing chatter, includ... | 11/29/1983 |
| 4388976 | Resilient mounting for engine enclosures It is conventional practice to rigidly secure a hood assembly on an engine enclosure for a construction vehicle. The connection joints are thus subjected to undue bending stresses. This invention solves the above stress problem by attaching one end (24) o... | 06/21/1983 |
| 4378602 | Communication system with a limited communication area In a communication system including communication transmitting means for modulating a carrier wave having a fixed frequency by a communication signal having communication content and for radiating the modulated signal wave, and receiving means for receivi... | 03/29/1983 |
| 4378595 | Synchronous multivalued latch A synchronous multivalued latch for storing logical current values of input current having any one of a plurality of multivalues, including a quantizer for receiving current, for generating a logical current being a quantization of the received current, a... | 03/29/1983 |
| 4375247 | Roller suspension A self-aligning mounting structure (52) for preventing flaking of, for example, the uprights (16) on a lift truck includes a crowned spring (94) positioned between an axle shaft (76) and a bearing assembly (82) of a roller (22) to allow the roller (22) to... | 03/01/1983 |
| 4364022 | Magnetic control pedal apparatus A control pedal apparatus (10) including a frame member (12), a Hall effect device (52) for generating a control signal responsive to an applied magnetic field, a pedal (14) having a magnet (16) and movable between first and second positions at which a ma... | 12/14/1982 |
| 4362351 | Terminal assembly Electrical terminal assemblies for providing a conductive path through a wall of a motor housing frequently work loose making connection and disconnection of lead wires difficult and resulting in poor electrical contact between the terminal and the leads.... | 12/07/1982 |
| 4360221 | Torsion bar axle suspension An axle suspension system wherein shock-absorbing members (31,32) allow vertical movement of an axle (25) relative to a frame (16). Unequal vertical movement of the ends of the axle (25) is restrained by a torsion bar (40) spaced from and parallel to the ... | 11/23/1982 |
| 4356893 | Load lifting carriage and mast assembly A carriage and mast assembly (10) including a mast (16) having outer sides (R, L) and a first pair (36, 38) of movable inner uprights and a second pair (20, 22) of fixed outer uprights, a load lifting carriage (12), a pair (48, 50) of free lift cylinders ... | 11/02/1982 |
| 4355947 | Hook-type carriage plate with floating forks A standard hook-type carriage assembly designed for lift truck use in the handling of palletized cargo is converted for use in the handling of concrete blocks by hooking block-handling forks on the carriage plate and positioning such forks on the carriage... | 10/26/1982 |
| 4355610 | Servo boosted governor control for engines The pedal effort required to change the setting of a governor (13) of an engine increases sharply with increased engine speed. Booster controls have been provided in the art for applying a boost force (FB), additive to an operator input force (... | 10/26/1982 |
| 4355510 | Unloading means for flow-pressure compensated valve A "load-plus" valve (34) is oftentimes utilized in the servo-system (20) for a variable displacement pump (11) to maintain pump discharge pressure (PD) above a minimum pressure level and above a load pressure signal (PL) generated in... | 10/26/1982 |
| 4354692 | Heavy duty drawbar A heavy duty drawbar features a Z-type brace which is accessible from the end of a vehicle which carries the drawbar. The Z-type brace provides significant strength for the overall drawbar while still allowing easy access to the hitch fastening bolts for ... | 10/19/1982 |
| 4354420 | Fluid motor control system providing speed change by combination of displacement and flow control A fluid motor control system (11) assures that automatic changes of motor displacement, which are initiated by occurrence of a predetermined operational condition in the system (11), result in a change of motor speed of the desired magnitude. Flow adjustm... | 10/19/1982 |
| 4354351 | Load sensing steering Fluid in the relatively long lines (22, 24) between a control valve (16) and a fluid actuator (14) can become overly viscous in cold weather. Herein, fluid is circulated through such lines (22, 24), at least during cold weather, even when the fluid actuat... | 10/19/1982 |
| 4350363 | Scraper bail stop assembly A stop assembly (66) for a bail (20) is provided which is particularly useful with the bail (20) of a push-pull scraper (18). The bail (20) is pivotally mounted by a pair of bifurcated brackets (28,30) affixed to the scraper (18), and is normally raised a... | 09/21/1982 |
| 4350127 | Torque spring adjustment mechanism Governors for diesel engines use a torque-spring to control the slope torque-rise curve as the rack actuator moves between the balance point and full load position. At present, it is difficult to adjust the torque spring mechanism to obtain the correct am... | 09/21/1982 |
| 4349717 | Flux dam assembly and method The flux dams used to form mounds of granular flux in submerged arc welding deteriorate rapidly because they are subjected to elevated temperatures and high heat. These flux dams also twist and distort creating gaps. Granular flux bleeds through these gap... | 09/14/1982 |
| 4349233 | Method and apparatus for controlling wheel slip on differentially mounted wheels A standard motor vehicle having a pair of driving wheels (8), (9) powered by a drive shaft (10) through a differential (11) can experience difficulties when one of the two differentially driven wheels (8/9) loses traction. The differential (11) directs al... | 09/14/1982 |
| 4346508 | Reboring fixture and method Pin bores of excavator forebooms are subjected to impact and side loading, causing wear which eventually leads to wobble of the foreboom. The close tolerance required in reboring such bores has previously necessitated transporting the foreboom to repair s... | 08/31/1982 |
| 4345768 | Self pumping seal for a reciprocating member A self pumping seal for a reciprocating member (12) provides cooling fluid to the reciprocating member (12) with degradation of an elastomeric seal (34) lessened by separating the elastomeric seal (34) from the higher temperatures of the machinery. Separa... | 08/24/1982 |
| 4345673 | Wheel brake arrangement Backing plates are normally bolted to wheel gear housings and brake shoes are normally biased against such backing plates. Hydraulic or pneumatic lines normally proceed externally of the housing and over the backing plate to connect with a wheel cylinder ... | 08/24/1982 |
| 4345509 | Contaminant trap for fluid operated rotary actuator A rotary actuator (11) having a vane (24) which is pivoted in a chamber (13) by fluid pressure to turn an actuator shaft (18) includes internal sump cavities (41A, 41B) that collect abrasive particles from the fluid and which hold such contaminants away f... | 08/24/1982 |
| 4345436 | Control for load sharing pumps Conditional exchanging of working fluid between plural fluid circuits (13A, 13B) having separate supply pumps (18A, 18B) is provided for without continuously bleeding fluid from the pump control pressure lines (21A, 21B). Each circuit (13A, 13B) has a pum... | 08/24/1982 |
| 4343588 | Kickout bucket positioner The previous linkages for transmitting signals across an axis (21) between a first member or cylinder (20) and a second member or frame (11) have been relatively difficult to adjust and have had a tendency to bind. Herein, a roller (44) is pivotally mount... | 08/10/1982 |
| 4343374 | Muffler mounting structure A stack (14) is attached to extend upwardly from a hood (12) in surrounding relation about a muffler (18). A sleeve structure (28) surrounds and holds the muffler (18). One or more tabs (30, 32, 34) extend generally outwardly from the sleeve structure (28... | 08/10/1982 |
| 4343152 | Load sensing porting arrangement Fluid control circuits employed on construction vehicles to control the actuation of various work cylinders oftentimes include a system for sensing the fluid pressure in the cylinder and communicating such fluid pressure to a control device in signal form... | 08/10/1982 |
| 4343151 | Series - parallel selector for steering and implement Prior art interrupted series type load sensitive hydraulic systems have not had the capability of both providing full speed simultaneous vehicle cornering and implement correction while preventing the same when the implements are operating at a high press... | 08/10/1982 |
| 4343150 | Sequential preconditioning circuit for hydrostatic transmission A fluid control circuit includes a source of pressurized fluid (10) adapted for connection to a hydrostatic transmission (23) upon actuation of a vent control valve (16). The vent control valve (16) is connected to a control and preconditioning valve (17)... | 08/10/1982 |
| 4343100 | Floor support for mobile scraper Heavy loads are imposed upon pivotally mounted floors (40) of mobile scrapers (10). A striking edge (41) of the floor (40) is used for leveling the discharging load when the floor (40) is open. Forces imposed on the striking edge (41) during leveling can ... | 08/10/1982 |
| 4341073 | Control circuit for variable displacement pumps with override valve A fluid control cirucit for selectively varying the displacement of a variable displacement pump (P), such as the type employed in a hydrostatic transmission, comprises a primary control circuit connecting a pressurized fluid source (10) with the pump (P)... | 07/27/1982 |
| 4340235 | Load responsive damping system A damping system (43) for use in a lift truck (10) to damp oscillating motions of the vehicle frame (14). The system includes a pair of hydraulic tilt cylinders (46a, 46b) which sense moments of force of a carried load (12). A pair of second hydraulic cyl... | 07/20/1982 |
| 4339961 | Pressure-responsive apparatus for assembling track links or the like Conventional apparatus for assembling a track chain tend to impose undesireable bending moments and residual loads thereon. The apparatus (22) of this invention overcomes these problems by providing a pair of movable pressure heads (26,28) registering wit... | 07/20/1982 |
| 4339919 | Flexible muffler mounting A muffler mounting (26) for a muffler (21) which is connected to an internal combustion engine (11) by a rigid exhaust pipe (16). Previous mountings for such mufflers have either been of the rigid type, which subjects the muffler to undesired stresses res... | 07/20/1982 |
| 4338896 | Fire suppression system A fire suppression system (10) for a vehicle having an engine (11) and a fire extinguisher (36) located proximate thereto. Previous systems of this type have not given any positive indication to the vehicle operator of the presence of an engine fire and h... | 07/13/1982 |
| 4337814 | Air valve conduit in the track wall of a tire Tires are typically inflated through an air conduit mounted on the tire carcass and extending through a hole in the metal rim on which the tire is mounted. Now and then relative slipping between the tire and rim has caused the air conduit to be sheared of... | 07/06/1982 |
| 4335992 | Side shift fork adjustable carriage A material handling device such as a lift truck (10) includes a pair of material handling forks (16,18) mounted on a carriage (22) that is movable upwardly and downwardly on a mast (14) by a hydraulic lift cylinder (104). The material handling forks (16,1... | 06/22/1982 |
| 4335797 | Noise suppression arrangement for engine enclosures An engine enclosure (10) has a noise suppression arrangement (15,15a,15b) mounted thereon including a plurality of acoustical energy absorbers (20,20a,20b) and sound reflectors (24,24a,24b) spaced from the absorbers to provide airflow passages (26,26a,26b... | 06/22/1982 |
| 4335685 | Lifter assembly Conventional lifter assemblies are relatively expensive to manufacture and generally extend laterally significantly beyond the ends of the roller surface thereof. As a result, fuel pumps utilizing such conventional assemblies must be spaced relatively far... | 06/22/1982 |
| 4334176 | Method of and means for controlling electrical devices In the control of two or more electrical devices powered by a common battery and each actuated by a separate controlled rectifier chopper circuit, at least one of which is an SCR chopper circuit, under high stress conditions requiring both electrical devi... | 06/08/1982 |
