Abstract: The invention relates to a collector (1), designed to be connected to a heat pump, which includes a number of tubes (2), which are at least mainly parallel to each other, which in a meander-like way in pairs are connected to each other by 180° bends (3), alternately located at the one or the other collector end, and also mechanism designed to fix the mutual positions of the tubes. According to the invention, the bends (3) are, when they will be applied to the tubes, designed as 90° bend pairs, one of the 90° bends forming half a 180° bend of one bend and the other of the 90° bends forming half a 180° bend of an adjacent bend, and the fixation mechanism are designed as the 90° bends (3), connected by the connection elements (6), which at least partially include the bends and aeration channels (13), which connect them.

Abstract: A method and apparatus for identification and control of the handling of keys which will register when a key is removed from and returned to an identification and control device. The identification code of the user is fed into a control center (4) and the identification code is forwarded to a printed circuit card (18) of a local control and indication unit (2) so that the removability and the removal of a key is registered and indicated on the control and indication unit (2) by the control center (4). The identification and control device (3) has a pin-like, hollow shell (26) with a printed circuit card (42) and a chip (43). The chip (43) has a unique code for each identification and control device (3). The hollow shell (26) is inserted into a hole (23) in the local control and indication unit (2) and engages with a contact (19) whereby information is forwarded, via the printed circuit card (42) and the chip (43) of the device (3), to the printed circuit card (18) of the local control and indication unit (2).

Abstract: An adjustable ladder base assembly for compensating an uneven foundation surface and/or to enable a ladder to be inclined at a given angle. The base assembly includes an arcuate bottom structure having footplate devices which can be brought into contact with the foundation surface, a strut which connects the two sides of the arcuate structure, and an attachment structure which is pivotally mounted to the strut and to the arcuate part and which is intended to support the ladder in a raised position. The attachment structure includes an upper, transverse bar which supports holding means for securing the sidepieces of the ladder. The bar is firmly connected by a spacer means, with a lower, transversely extending and upwardly open channel section which is intended to receive a rung of the ladder. The spacer means can be clamped to the arcuate part by the friction locking action of an upper, transversely extending U-shaped strut which embraces the arcuate part and is pivotally mounted to the strut via a lower arm.