Abstract: An improved angularly adjustable traction apparatus (10) including a generally rectangular platform member (20) having an elongated track groove (30) disposed in one side (23) for slidably receiving a limb immobilizing unit (12) and a pulley unit (13) having a traction device (90). Both the limb immobilizing unit (12) and the pulley unit (13) are provided with securing elements (50), (50′) etc. for captively engaging the limb immobilizing (12) and pulley (13) units at selected locations within the track groove (30) and a pair of anchor units (15) associated with portions of the limb immobilizing (12) and pulley (13) units to maintain their angular orientation relative to the platform member (20).

Abstract: An angularly adjustable traction apparatus (10) for applying traction forces to a patient's limb wherein the apparatus (10) includes a base platform member (20) provided with a rail unit (14) that is raised relative to the base platform member (20) and a limb immobilizing unit (12) and pulley unit (13) slidably disposed on the rail unit (14) and adapted to be angularly adjusted relative thereto; wherein, the pulley unit (13) includes a support post member (50) and a pulley member (60) suspended from the support post member (50) and provided with a bracket element (61) whose height can be varied to the base platform member (20).

Abstract: An improved angularly adjustable traction apparatus (10) including a generally rectangular platform member (20) having an elongated track groove (30) disposed in one side (23) for slidably receiving a limb immobilizing unit (12) and a pulley unit (13) having a traction device (90). Both the limb immobilizing unit (12) and the pulley unit (13) are provided with securing elements (50), (50′) etc. for captively engaging the limb immobilizing (12) and pulley (13) units at selected locations within the track groove (30) and a pair of anchor units (15) associated with portions of the limb immobilizing (12) and pulley (13) units to maintain their angular orientation relative to the platform member (20).

Abstract: Electronic equipment having a temperature control air flow passage. A length of filter material has a length portion extending across the upstream end of the flow passage, the filter material being movable longitudinally to replace the clogged length portion with unused filter material. A filter advancement device is operable by a control device actuated when an undesirably low fluid flow rate is achieved through the length portion so as to effect filter replacement. Roller devices give up unused filter material and take up used material. A stepper motor may be used to advance filter material for replacement purposes. The control device is preferably operated upon drop in rotational speed of a fan located immediately downstream of the filter length portion, the speed drop being caused by drag as the filter becomes clogged. Alternatively, the control device comprises a switch which is operated as the filter length portion flexes it becomes clogged, or temperature sensors located at chosen sites.

Abstract: An outdoor wireless base station having a housing and a circuit pack extending upwards in the housing with electronic components extending into a forward air flow passage. The forward air flow passage is interconnected for air circulation with a rearward air flow passage and a heat conductive rear wall of the housing partly defines the rearward flow passage. Air in the forward air flow passage flows upwards and into the rearward air flow passage for heat removal through the rear wall. The cooling air flows downwards in the rearward air flow passage to return to the bottom of the forward air flow passage.

Abstract: Electronic unit of printed circuit board with electronic components on one side and its other side in heat conducting contact with a heat sink enables the electronic components to be sealed from ambient atmosphere and thus unpackaged chips may be used. The units are mountable in a support frame with air cooling passages of the heat sinks extending vertically for convected cooling air. In each unit, a resistor network may extend into a cavity formed in a heat exchange rib and an electronic chip, perhaps unpackaged in the sealed environment, may be in heat conductive relationship with the heat sink.

Abstract: Electronic module of printed circuit board with electronic components on one side and its other side in heat conducting contact with a heat sink enables the electronic components to be sealed from ambient atmosphere and thus unpackaged chips may be used. The modules are mountable in a support frame with air cooling passages of the heat sinks extending vertically for convected cooling air. In each module, a resistor network may extend into a cavity formed in a heat exchange rib and an electronic chip, perhaps unpackaged in the sealed environment, may be in heat conductive relationship with the heat sink.

Abstract: A telephone hook switch uses an elastomeric member as the contact making member. A hook switch has a pivotally mounted actuating member having two levers extending in opposite directions, one on each side of the pivot axis. One lever is moved by the positioning, and removal, of a handset, the actuating member being biased to a particular pivotal direction. The other lever presses on a deformable projection in the elastomeric member. Depression of the projection causes an electrically conducting layer to move into contact with contact areas of a switch position on a printed circuit board.

Abstract: A circuit pattern on a circuit board, as used in telecommunications systems and other electrical apparatus, often has contact positions for switches, such as pushbutton switches, and for other purposes. The normal copper circuit pattern is covered at the contact positions to give improved contact conditions. Carbon ink has been proposed by obtaining the necessary high level of alignment of carbon ink with the copper pattern at contact positions is difficult as such contact positions have very close members. The invention proposes contact positions having closely spaced inter-digital contact members, in which the circuit pattern extends to and stops at the peripheral region of a contact position, the contact members being of carbon ink and overlapping conductors of the circuit pattern at the peripheral region.