摘要:
A circuit for driving a light source, e.g., an LED light source, includes a converter, a sensor, and a controller. The converter converts an input voltage to an output voltage across the LED light source based upon a driving signal. A duty cycle of the driving signal determines an average current flowing through the LED light source. The sensor is selectively coupled to and decoupled from the converter based upon the driving signal. The sensor generates a sense voltage indicative of a current flowing through the LED light source when the sensor is coupled to the converter. The controller is coupled to the converter and sensor. The controller compares the sense voltage to a reference voltage indicative of a predetermined average current through the LED light source to generate a compensation signal and generates the driving signal based upon the compensation signal. The duty cycle of the driving signal is adjusted based upon the compensation signal to adjust the average current flowing through the LED light source to the predetermined average current.
摘要:
A dimming controller for controlling power of a light source has a monitoring terminal, a dimming terminal, and a control terminal. The monitoring terminal is operable for receiving a current monitoring signal indicating a current flowing through the light source. The dimming terminal is operable for receiving a ramp signal. The voltage of the ramp signal increases if a power switch coupled between a power source and the light source is turned on. The control terminal is operable for providing a control signal to control a control switch coupled in series with the light source based on the current monitoring signal and the ramp signal. An average current of the light source increases as the ramp signal increases until the average current reaches a predetermined level.
摘要:
A door lock assembly includes a transverse retaining plate disposed inside a spindle tube and having a stabilizing part and a retaining tongue projecting into a retention slot in a handle. A support structure is disposed within the handle oppositely of the retention slot and has a support part extending radially into the spindle tube. When the door lock assembly is in a locking state and when the retaining tongue in the retention slot is pressed externally, one of two diametrically opposite edges of a tailpiece of a key plug abuts against the support part, and the other one of the edges abuts against the stabilizing part of the retaining plate to restrict the retaining tongue from moving away from the retention slot, thereby preventing undesirable removal of the handle from the door lock assembly.
摘要:
A the compact disk packing machine includes a base having a box providing device for move empty boxes to a box opening device which opens the empty boxes one by one. A transferring device transfers the opened boxes to a disk providing device and a disk positioning device to put a compact disk in each of the opening boxes. A sheet putting device puts a sheet of commercial in the open boxes and a closing device closes the boxes. The boxes having a compact disk and a sheet of commercial are transferred to a collection device and piled up.
摘要:
A lock assembly includes a linkage mechanism which is operable from the outside of a door via a lever and which is drivingly connected to a latch. An inside operating mechanism which is operable from the inside of the door is connected to the linkage mechanism so that the inside operating mechanism need not be connected to the latch. The lock assembly is suitable for use with a latch having only one cam wheel or two cam wheels.
摘要:
Two first engagement members are formed on a first side of a transmission plate of a dual backset deadbolt assembly, while two second engagement members are formed on an opposite second side of the transmission plate posterior to the first engagement members. A first cam drive unit is retained rotatably in a first backset position relative to the transmission plate and is disposed adjacent to the first side. A second cam drive unit is movable between first and second backset positions relative to the transmission plate and is disposed adjacent to the second side. A deadbolt operating spindle of a lock extends through the first and second cam drive units so as to permit engagement of the first cam drive unit with one of the first engagement members in order to actuate the transmission plate when the second cam drive unit is in the first backset position and the deadbolt assembly is adjusted to a shorter backset length. The deadbolt operating spindle extends through the second cam drive unit so as to permit engagement of the second cam drive unit with one of the second engagement members in order to actuate the transmission plate when the second cam drive unit is in the second backset position and the deadbolt assembly is adjusted to a longer backset length.
摘要:
A face plate includes a tubular member for freely and rotatably receiving a latch housing and having a first end and a second end. An opening is formed in the first end through which a latch bolt passes and has a diameter smaller than an outer diameter of the latch housing. The second end of the tubular member has an inner diameter smaller than the outer diameter of the latch housing. A flange extends radially and outwardly from the first end of the tubular member. The tubular member further has a plurality of axially extending projections formed on an outer periphery thereof.
摘要:
A cylindrical door lock set includes inner and outer knob supporting plates, a turning mechanism, an annular mounting plate and a latch unit. The outer knob supporting plate has a central hole and an inner side provided with a pair of posts on two sides of the central hole. The posts are hollow and are threaded internally. The turning mechanism is supported on the inner side of the outer knob supporting plate and is provided with a turn shaft. The annular mounting plate is secured on the inner side of the outer knob supporting plate and is formed with a pair of mounting shafts and a central hole to permit the turn shaft of the turning mechanism to extend therethrough. The latch unit is formed with a shaft engaging hole to permit the turn shaft to extend therethrough, and two side holes disposed on two sides of the shaft engaging hole in a lengthwise direction of the latch unit to receive respectively the mounting shafts. The latch unit is disposed between the posts of the outer knob supporting plate. The inner knob supporting plate is formed with a pair of holes which are aligned with the posts. Bolts pass through the holes of the inner knob supporting plate and engage a respective one of the posts.
摘要:
A lock set for use with a deadbolt which includes an improved spindle mechanism is disclosed. The improved spindle mechanism permits the lock set to unlatch the deadbolt by rotating an inner knob without the need to operate a spindle-turning button.
摘要:
A cylinder lock has a cylindrical plug which is formed with a longitudinally extending keyway and which has a plurality of pin tumblers extending into the keyway. Each of the pin tumblers has a cylindrical outer part and a concentric inner part telescopically slidable within the outer part. A key is inserted into the keyway and has a tumbler activating side which is formed with a longitudinally extending groove, a groove base having projections and/or recesses formed therein and a pair of upwardly extending key blades joined by the groove base. The inner part of each of the pin tumblers has a distal end which extends into the groove and which engages a corresponding one of the projections and/or recesses. The key blades are formed with matching key bit grooves which engage the outer parts of the pin tumblers. Each of the key bit grooves has a groove bottom which is disposed above the groove base, thereby permitting a relatively large difference between the lengths of the inner and outer parts of the pin tumblers so as to increase correspondingly the number of possible lock combinations and the difficulty in picking the cylinder lock.