271 results about "Constant angle" patented technology

A wide angle directed reflector is disclosed. The directed reflector includes a lenticular layer including at least one array of lenslets, each of which having a focal length, The directed reflector further includes a reflective layer which is disposed relative to the lenticular layer. The lenticular layer and the reflective layer are constructed, designed and relatively disposed such that light incident at an angle of incidence on the lenticular layer is reflected by the reflective layer and redirected through the lenticular layer at a substantially constant angle relative to the angle of incidence.

An aiming sight includes a controller, a power supply, an LED array, and a collimator. The power supply powers the LEDs to turn-on and turn-off, and powers the collimator to rotate. The collimator rotates to different rotational positions while the controller, the power supply, and the LED array remain fixed in place. The LEDs are positioned such that one LED and the collimator are at a constant angle and separated by a constant focal distance for each collimator position. The controller controls the collimator to rotate to a collimator position to generate an aiming dot at an angular position corresponding to the collimator position. The controller turns-on the LED which is at the constant angle and separated from the collimator by the constant focal distance and turns-off the remaining LEDs such that the collimator collimates light from the turned-on LED into the aiming dot at the angular position corresponding to the collimator position.

PCT No. PCT / US96 / 15478 Sec. 371 Date Mar. 20, 1998 Sec. 102(e) Date Mar. 20, 1998 PCT Filed Sep. 20, 1996 PCT Pub. No. WO97 / 11395 PCT Pub. Date Mar. 27, 1997An underwater cable arrangement comprises an underwater cable capable of being towed through the water, an external device for mounting on the exterior of the cable, and a coil support device disposed inside the cable for supporting a coil. In some embodiments, the coil support device and the external device have engaging portions which co-act with each other to prevent relative rotation of the coil support device and the external device about the longitudinal axis of the cable. In some embodiments, the underwater cable has a skin and the external device is positioned around the coil support device with the skin of the underwater cable between them. The coil support device and the external device have an interference fit with respect to each other to resist relative movement to the coil support device and the external device in the longitudinal direction of the cable. In some embodiments, the external device and the coil support device are fitted to each other so as to maintain a constant angle between a longitudinal axis of the cable and a longitudinal axis of the external device.

Apparatus for the fixed-angle fixation and compression of a fracture site or osteotomy of a bone includes a bone plate having a plurality of holes and bone screws with a threaded head. The bone screws accommodated in the holes are screwed into the bone. At least one of the holes is a combination of two circular holes of different diameter. As screwing of the bone screw into the bone proceeds through a final stage, engagement of the threads on the head with threads in the combination hole effects relative longitudinal displacement between the plate and the bone whereby it is possible to simplify simultaneous fixed angle fixation and compression of the fracture or osteotomy with use of a single screw. Threads on the head of the bone screw engage threads in the hole which is a combination of the two hole to effect relative motions.

Embodiments of the present invention provide apparatus for guiding medical instruments, including a handle with a handle shaft, an alignment stand configured to interface with a receptacle of a cervical plate, an instrument guide tube coupled to the alignment stand and having a lumen therethrough, such that when the alignment stand is in communication with the receptacle, the instrument guide tube is positioned over a bone screw receiving hole in the cervical plate and an axial centerline of the instrument guide tube passes through the bone screw receiving hole. Instrument guide tube may swivel about the alignment stand via a rotational coupling, or may be one of two fixed instrument guide tubes. Alignment stand may include an angle-limiting post to interface with the receptacle to permit ranges of tilting, or a stem and optional bone pin for holding the alignment stand at a substantially constant angle in the receptacle.

An aiming sight includes a controller, a power supply, an LED array, and a collimator. The power supply powers the LEDs to turn-on and turn-off, and powers the collimator to rotate. The collimator rotates to different rotational positions while the controller, the power supply, and the LED array remain fixed in place. The LEDs are positioned such that one LED and the collimator are at a constant angle and separated by a constant focal distance for each collimator position. The controller controls the collimator to rotate to a collimator position to generate an aiming dot at an angular position corresponding to the collimator position. The controller turns-on the LED which is at the constant angle and separated from the collimator by the constant focal distance and turns-off the remaining LEDs such that the collimator collimates light from the turned-on LED into the aiming dot at the angular position corresponding to the collimator position.

By way of example, a cam assembly and strap based closure system using a spiral is configured for bringing two sides of an article together. When the user inserts the strap into the cam assembly and turns a knob, the strap is driven into the cam assembly and the strap pins engage one or more cam spirals. The system is configured such that strap pins are engaged at a constant angle which may be self-locking. The system is infinitely adjustable and the torque felt by the knob is constant. The system is configured to be a quick release system and allows rapid insertion of the strap for faster operation.

A device for circumscribing a target site with a beam. The target site is located within a target body. The path of the beam is varied rotationally so as to form a cone with an isocenter at the cone's apex. The isocenter is fixed on the approximate center of the target site. The target body is rotated about a vertical axis passing approximately through the center of the target site, and the rates of rotation of the beam path and body, respectively correspond so that the beam intersects an axis passing through the target site at an approximately constant angle.

An exercise device can include a pair of pedal members, each of which can be rotatably connected on at least one end to a planet gear that is rotatable about a sun gear on each side of the device. The pedal members and the planet gears can be rotated to provide an elliptical exercise motion. The device can include a mechanism for simultaneously rotating each of the sun gears together to change the orientation of the elliptical exercise motion relative to a user. The orientation of an elliptical exercise motion can be changed dynamically from one orientation to another, for example, from horizontal to uphill or downhill, during a particular workout period. The exercise device can change the orientation of an elliptical exercise motion while maintaining a user's ankles at a substantially constant angle during the exercise cycle.

A centrifugal compressor assembly for compressing refrigerant in a 250-ton capacity or larger chiller system comprising a motor, preferably a compact, high energy density motor or permanent magnet motor, for driving a shaft at a range of sustained operating speeds under the control of a variable speed drive. Another embodiment of the centrifugal compressor assembly comprises a mixed flow impeller and a vaneless diffuser sized such that a final stage compressor operates with an optimal specific speed range for targeted combinations of head and capacity, while a non-final stage compressor operates above the optimum specific speed of the final stage compressor. Another embodiment of the centrifugal compressor assembly comprises an integrated inlet flow conditioning assembly comprising a flow conditioning nose, a plurality of inlet guide vanes and a flow conditioning body that positions inlet guide vanes to condition flow of refrigerant into an impeller to achieve a target approximately constant angle swirl distribution with minimal guide vane turning.

The invention resides in providing a windmill for highly efficient wind power generation by enabling to efficiently rotate the windmill even in starting or at a low wind speed region by improving a blade of a vertical shaft type windmill of a lift type. In a windmill for wind power generation in which a plurality of blades are provided in parallel with a rotating shaft in a face orthogonal to the vertical rotating shaft at constant angles centering on the rotating shaft, the blade is of a blade type having a high lift coefficient at low Raynolds number and a notch portion is formed at a rear edge portion of a lower face of the blade.

A windmill for highly efficient wind power generation is provided by enabling one to efficiently rotate the windmill even in starting or at a low wind speed region by improving a blade of a vertical shaft type windmill of a lift type. In the windmill for wind power generation, a plurality of blades are provided in parallel with a rotating shaft in a face orthogonal to the vertical rotating shaft at constant angles centering on the rotating shaft, wherein the blade is of a blade type having a high lift coefficient at low Reynolds number and a notch portion is formed at a rear edge portion of a lower face of the blade.

An end mill is provided that includes a shank section and a fluted section. One or more helical teeth are disposed along an outer surface of the fluted section. Each helical tooth has a cutting surface and a relief wall that intersect to form an angle defining a helical cutting edge. The cutting surface of each helical tooth includes a first section, a second section, and a take-off peak disposed between the first section and second section. The cutting edge of each helical tooth includes a first portion having a first constant angle, and a second portion having a second constant angle unequal to the first constant angle, and an arcuate transition section connecting the first portion and second portion. Some embodiments of the present invention include more portions than the aforesaid first and second portions.

In order that it is realized to put 16× speed DVD-RAM in practice, a recording method coping with CAV (constant angular velocity) and a method for improving S / N ratio are provided and an optical disk device using them is provided. In order that a cutoff phenomenon of pulse in a laser driving circuit may not occur, the shortest pulse width is set at 1 Tw or more where Tw indicates a window width, and a recording pulse in which a 4T mark is recorded with a mono pulse where T indicates a detection window width and the parameter setting range are prescribed. Simultaneously, a reproduction power for 6× speed or more is set at 1.5-2.0 mW, different from a conventional value, and a setup sequence with which deterioration of data in reproducing does not occur is provided. Thereby it becomes possible to put 16× speed DVD-RAM in practice.

An exercise machine which is capable of having its lift, roll, or pitch adjusted with respect to a base so as to provide a plurality of positions of the exercise machine with respect to the base. The exercise machine generally includes a base and an exercise machine movably connected to the base. The exercise machine may include a track, a carriage slidably connected to the track, and a biasing member attached to the carriage to apply a resistive force to the carriage. A plurality of actuators may be connected between the base and the exercise machine. The plurality of actuators may be utilized to adjust a pitch angle or a roll angle of the exercise machine with respect to the base. The plurality of actuators may also be utilized to lift or lower the exercise machine at a constant angle of pitch and / or roll inclination.

A keyboard support mechanism containing a novel articulating arm mechanism for permitting vertical movement of the keyboard shelf. The articulating arm mechanism has six major components: (1) a mounting bracket, (2) a mounting bracket support in combination with a swivel bracket, (3) a shelf bracket, (4) an upper aim, (5) at least one side arm, and (6) at least one stopping member. The upper arm links the shelf bracket and the mounting bracket; the side arm and the stopping means cooperate to keep the shelf bracket (and hence the keyboard shelf) at a constant angle relative to the ground.

A centrifugal compressor assembly for compressing refrigerant in a 250-ton capacity or larger chiller system comprising a motor, preferably a compact, high energy density motor or permanent magnet motor, for driving a shaft at a range of sustained operating speeds under the control of a variable speed drive. Another embodiment of the centrifugal compressor assembly comprises a mixed flow impeller and a vaneless diffuser sized such that a final stage compressor operates with an optimal specific speed range for targeted combinations of head and capacity, while a non-final stage compressor operates above the optimum specific speed of the final stage compressor. Another embodiment of the centrifugal compressor assembly comprises an integrated inlet flow conditioning assembly comprising a flow conditioning nose, a plurality of inlet guide vanes and a flow conditioning body that positions inlet guide vanes to condition flow of refrigerant into an impeller to achieve a target approximately constant angle swirl distribution with minimal guide vane turning.

The invention provides a material-charging material-taking servo simulated manipulator, belonging to manipulators, and is used for charging and taking materials of large-scale workpieces. According to the invention, a vehicle body moves and a rotary workbench rotates under full-hydraulic power; a front large arm, a middle large arm, a back large arm, an upper small arm, a lower small arm, a link board, an upper toggle rod, a lower toggle rod and the rotary workbench form three parallelograms; the cylinder rod of a lifting oil cylinder is articulated with the lower toggle rod; the cylinder rod of a link rod telescopic oil cylinder is articulated with the middle large arm; a rotary support hydraulic motor drives a tongs head portion to swing; a tongs head telescopic oil cylinder drives the telescopic oil cylinder to extend and retract; a tongs head rotary hydraulic motor is connected with a worm and worm wheel mechanism; a hollow worm wheel shaft is connected with a hollow shaft; a pull rod is connected with the tongs head; the tongs head rotary hydraulic motor drives the tongs head to rotate; the cylinder rod of the clamp cylinder with the cylinder rod located on the axis of the worm wheel shaft is connected with the pull rod to drive the tongs head to clamp or release. The manipulator provided by the invention solves the technical problems of constant angle changes of the mechanical arms and the rotary workbench driven by the pitching oil cylinder of the existing material-charging material-taking manipulator and defects of the clamp rotation mechanism.

An end mill is provided that includes a shank section and a fluted section. One or more helical teeth are disposed along an outer surface of the fluted section. Each helical tooth has a cutting surface and a relief wall that intersect to form an angle defining a helical cutting edge. The cutting surface of each helical tooth includes a first section, a second section, and a take-off peak disposed between the first section and second section. The cutting edge of each helical tooth includes a first portion having a first constant angle, and a second portion having a second constant angle unequal to the first constant angle, and an arcuate transition section connecting the first portion and second portion. Some embodiments of the present invention include more portions than the aforesaid first and second portions.

A centrifugal compressor assembly for compressing refrigerant in a 250-ton capacity or larger chiller system comprising a motor, preferably a compact, high energy density motor or permanent magnet motor, for driving a shaft at a range of sustained operating speeds under the control of a variable speed drive. Another embodiment of the centrifugal compressor assembly comprises a mixed flow impeller and a vaneless diffuser sized such that a final stage compressor operates with an optimal specific speed range for targeted combinations of head and capacity, while a non-final stage compressor operates above the optimum specific speed of the final stage compressor. Another embodiment of the centrifugal compressor assembly comprises an integrated inlet flow conditioning assembly comprising a flow conditioning nose, a plurality of inlet guide vanes and a flow conditioning body that positions inlet guide vanes to condition flow of refrigerant into an impeller to achieve a target approximately constant angle swirl distribution with minimal guide vane turning.

Disclosed herein is a level comprising a horizontal component comprising a first terminal end and a second terminal end; a first vertical component comprising an end joined to the first terminal end of the horizontal component, wherein the first vertical component is attachable to a first vertical side of a jamb; and a second vertical component comprising an end joined to the second terminal end of the horizontal component, wherein the second vertical component is attachable to a second vertical side of a jamb; wherein the level squares, levels, and plumbs the jamb. Further disclosed herein is an assembly comprising two levels disposed on a jamb such that the sides of the jamb are held rigid and secure, and the angles of the jamb are held at a constant angle to increase the ease of installation of the jamb.

A method for coding in frequency, module and phase a digital representation, in the space field, of a ring-shaped element, including the steps of: applying to any point of the element a polar conversion at constant angle, whereby the element is unfolded in rectangular form; transferring, to the frequency field, any point of the converted rectangular shape by means of a Fourier transform; filtering the discrete data resulting from the transfer by means of at least one real, bidimensional, band-pass filter, oriented along the phase axis; applying a Hilbert transform to the filtering results; applying an inverse Fourier transform to the results of the Hilbert transform; and extracting phase and module information in the space field.

A method for operating a wind turbine having a rotor with a number of wind turbine blades, wherein the rotor's axis of rotation is tilted in relation to the direction of the incoming wind, includes the steps of determining the azimuth angle (A) of the blades and adjusting the pitch angle of the blades in accordance with the azimuth angle (A) to ensure a substantially constant angle of attack (AoA) during at least a full rotation of the rotor. A wind turbine and use of the method are also contemplated.

An air-conditioning register includes a cylinder-shaped retainer having opposite inner surfaces, a fin assembly including a plurality of fin members disposed in the retainer, a first connector connecting the fin members, a second connector, and a guide guiding the second connector on a predetermined track. The fin members includes paired fin members disposed in proximity to the opposite inner surfaces of the retainer, at least one of the paired fin members swinging by a swing angle smaller than that of all of the other fin members, and functioning as a dummy fin member keeping a constant angle independently within a predetermined swing-angle range where all of the other fin members swing. The second connector connects the dummy fin member and all of the other fin members while absorbing a swing-angle difference between the dummy fin member and all of the other fin members.

An air-conditioning register includes a cylinder-shaped retainer having opposite inner surfaces, a fin assembly including a plurality of fin members disposed in the retainer, a first connector connecting the fin members, a second connector, and a guide guiding the second connector on a predetermined track. The fin members includes paired fin members disposed in proximity to the opposite inner surfaces of the retainer, at least one of the paired fin members swinging by a swing angle smaller than that of all of the other fin members, and functioning as a dummy fin member keeping a constant angle independently within a predetermined swing-angle range where all of the other fin members swing. The second connector connects the dummy fin member and all of the other fin members while absorbing a swing-angle difference between the dummy fin member and all of the other fin members.

The polishing machine processes a workpiece put on table of body by four-directional control and is provided with a pair of columns. It comprises: first carrying unit having both ends fixed to pair of columns and having carrying part mounted on upper side; a second carrying unit being fixed to the carrying part in the direction orthogonal to the first carrying unit; third carrying unit being fixed to one end of the second carrying unit in the direction orthogonal to the second carrying unit; a tool head unit being mounted to lower side of the third carrying unit to be inclinable at predetermined angle by a tilting unit rotating at a constant angle and having driving means for rotating a polishing tool mounted at one side; and automatic constant pressure regulating means providing a predetermined virtual pressure with respect to the polishing tool mounted on the tool head unit.

A head mounted display assembly including a frame comprising a base (5) adapted to rest on a top portion of a head of a user, a front frame portion (4) adapted to rest against a front portion of the head of the user, and a rear frame portion (6) adapted to rest against a back portion of the head of the user. The assembly also includes an optical display housing (2). Additionally, the assembly includes an adjustment mechanism configured to adjust a distance between the front frame portion (4) and the rear frame portion (6) while maintaining the optical display housing (2) at a constant angle relative to the base (5). The instant abstract is neither intended to define the invention disclosed in the specification nor intended to limit the scope of the invention in any way.