摘要:
An one-piece corner connector for connecting two frame bars at right angles to one another includes a right-angle bracket having two angle legs, an intermediate plate, and two U-profile connecting pieces at right angles, having a middle leg and two side legs for insertion into the plug-in openings in the frame bars which are open at one end. The middle legs of the U-profile connecting pieces are formed on and run with their outer side parallel to the intermediate plate. The one outer side legs of the U-profile connecting pieces are each formed on one of the angle legs and run with their outer side parallel to the outer side of the angle leg. The other inner side legs of the U-profile connecting pieces are connected to one another by means of a wall element which is angled from the intermediate plate.
摘要:
An illumination device comprises at least one LED (36), which can be connected through circuit means (50) to a voltage source optionally formed by a battery unit (70) or an accumulator unit (74). Furthermore, a first contact means (60) is provided for connecting the battery unit (70) and a second contact means (64) for connecting the accumulator unit (74) to the circuit means (50). A bottom unit for a battery grip (11) comprising a grip sleeve (90) in which the accumulator unit (74) is arranged, has a basic body (84) mountable at the lower end of the grip sleeve (90), wherein an upper contact element (89) for contacting the accumulator unit (74) and a lower contact element (95) for contacting a contact element (107) of a charging station, to which a current is applied, are arranged in the basic body (84). An electronic circuit unit (99) having a microprocessor (1) is connected between the upper and the lower contact elements (89, 95), which electronic circuit unit (99) is formed and configured such that it controls a charging process for charging the accumulator unit (74).
摘要:
A parking brake having an actuator, wherein the actuator is driven with a direct current motor which can be operated in two directions and which moves a piston of the actuator and, via a self-locking gear mechanism of the actuator, at least one brake shoe for applying or releasing the parking brake. A control unit for performing open-loop or closed-loop control of the movement of the direct current motor is also provided. During open-loop or closed-loop control of the movement of the direct current motor for applying and/or releasing the parking brake, the control unit takes into account a hydraulic admission pressure which is currently present at the piston if the brake is applied or was present at the piston if the brake has been released when it had previously been applied. A corresponding method for operating such a parking brake is also disclosed.
摘要:
A headband apparatus for head-worn optical instruments includes a headband (12) and a bow (16) on which the optical instrument is fitted, and which is fitted with both its ends (100) to the middle region of the headband (12) such that it can swivel about a swivel axis (S) between a working position and a rest position. Fastening elements (26, 28) for releasably fastening additional elements (38) are fitted on the headband (12).
摘要:
A battery grip for diagnostic units comprises a grip sleeve for accommodating batteries, at the upper end of which a metal sleeve for accommodating a consumer load, such as an electric bulb, is mounted, a guide opening formed in the wall of the grip sleeve, a switching slide being guided the guide opening in a longitudinal direction of the grip sleeve, a contact member extending from a lower end of the grip sleeve with one contact end into the guide opening, and a contact spring member having one end conductively connected to the metal sleeve manner and another free end extending into the guide opening such that the free end is disposed above the contact member and is brought into contact with the contact member by displacing the switching slide. The contact between free end of the contact spring member and the contact member is created by at least two contact points. At least one longitudinal recess is provided in the contact end of the contact member. At least one contact head extending towards the contact member is provided at the free end of the contact spring member for engaging in the longitudinal recess for creating a contact between the contact member and the contact spring member, the contact head being formed such that it contacts both longitudinal sides of the longitudinal recess.
摘要:
A bar skiascope that has lens slide for displacing a condenser lens along a direction of a light beam also includes a stop slide that can be displaced up to a predetermined maximum position in a displacement path of the lens slide, wherein the condenser lens is located precisely in a position for producing a substantially parallel beam, when the stop slide is in the maximum position, and a stop slide stop element, belonging to the stop slide, and a lens slide stop element, belonging to the lens slide, come into contact with each other.
摘要:
An apparatus for testing visual acuity, or clearness of vision, particularly when there is impaired refracting medium in an eye, includes a lamp (1) and a pin-hole diaphragm (4) arranged in a light-beam path downstream of the lamp with a single diffraction grating (6), being provided in the light-beam path downstream of the pin-hole diaphragm.
摘要:
A semiconductor switching network is disclosed in which complementary bipolar transistors are employed as "floating" crosspoints. Each crosspoint consists of a pair of complementary bipolar transistors with each transistor being connected in series with one of the leads of the communication pair. Each one of the complementary bipolar transistors is, in turn, surrounded by a "protective control shell" of diodes and transistors which provides the crosspoint with overvoltage and reverse voltage protection and secures crosspoint turn-off. Additionally, the protective control shell contains a self-bias arrangement to eliminate the need for external power supplies to operate the crosspoint as well as an optoisolator control circuit to eliminate direct connections to external control circuits. Thus, the disclosed "protective control shell" converts the complementary bipolar transistors into a "floating" crosspoint - powered solely from the communication leads with no direct connection to any external power supply or control circuit, which crosspoint is insensitive to both the polarity and the magnitude of the applied voltage and current.