Hereinafter the invention will be explained in more detail by way of example with reference to the enclosed drawing. The figures are described as follows:
FIG. 1 a perspective view of an access control apparatus having a rotating arm assembly with two blocking arms;
FIG. 2 the part of the blocking arm facing the rotation axis of the rotating arm assembly according to FIG. 1 in longitudinal section;
FIG. 3 a side view of the elastic core piece of the blocking arm according to another embodiment but without hinged bodies and outer sheath.
According to FIG. 1, an access control apparatus has a rotating arm assembly 1 with two blocking arms 2 for blocking the access lane 3 which is passed in the direction of the arrow 4. The rotating arm assembly 1 is rotatable around an axis 5 inclined e.g. by 35° from the horizontal. The blocking arms 2 enclose an angle of e.g. 45° with the rotation axis 5.
FIG. 1 shows the blocking arms 2 in the open-gate basic position in which it releases the access. Rotation of the rotating arm assembly 1 according to the arrow 6 causes a blocking arm 2 to be rotated upward into the position 2′ shown by dashed lines in FIG. 1 and the access 3 thus blocked. The motor (not shown) of the rotating arm assembly 1 is driven for this purpose by an access authorization reader with an antenna 7 and a people sensor 8 in housings 9 and 10, respectively. The access authorization reader is formed for reading an access authorization which is stored on an RFID transponder. This means that the one blocking arm is rotated into the blocking position 2′ only when the people sensor 8 detects a person but the access authorization reader does not read a valid access authorization.
According to FIG. 2, the blocking arm 2 is fastened to a hub 11 which is slipped rotationally fast on a shaft (not shown) for rotating the rotating arm assembly 1. For axially fastening the hub 11 to the shaft, a screw bolt (not shown) is provided which penetrates the bore 12. A tube section 13 is fastened to the hub 11. The hub 11 and the tube section 13 are made of metal and are welded together for example.
The short tube section 13 is followed by a springy core piece 14. The core piece 14 consists of hinged-together bodies 15a to 15d. The bodies 15a and 15d form the two ends of the core piece 4 between which the middle bodies 15b and 15c are disposed.
The body 15a has a cylindrical pin 17 which is inserted into the tube section 13 on the hub 11 and fixed with a screw (not shown) which penetrates the bore 16. Likewise, the body 15d is provided with a cylindrical pin 18 which is inserted into a further metal tube section (not shown) and fixed accordingly therein e.g. with a screw which penetrates the bore 18′.
For hinging together the bodies 15a to 15d, the body 15d and the middle bodies 15b and 15c have a projection 19a to 19c and the body 15a and each middle body 15b and 15c a recess 20a to 20c, the projections 19a to 19c engaging the recesses 20a to 20c of the adjacent body 15a to 15d.
The bodies 15a to 15d are made of plastic. They have a cylindrical circumferential area coaxial to the longitudinal axis A of the blocking arm 2. The recesses 20a to 20c are also formed substantially cylindrically and coaxially to the longitudinal axis A, while the projections 19a to 19c are likewise formed coaxially but taper away from the respective body 15a to 15c. For all bodies 15a to 15d to be aligned coaxially, the portion of the projections 19a to 19c facing the respective body 15a to 15c is provided with a diameter corresponding to the diameter of the recess 20a to 20c which it engages.
The bodies 15a to 15d are provided with coaxial through bores 21a to 21d having extending therethrough a rod-shaped element 22 made of rubber-elastic material, e.g. thermoplastic elastomer. The element 22 is stretched and fixed e.g. with pins 23, 24 to the end bodies 15a and 15d to brace the bodies 15a to 15d together.
An outer sheath 25 made of foam rubber is pushed over the springy core piece 14 and the further, only partly shown tube section 13′ at the end of the blocking arm 2 facing away from the hub 11.
In the embodiment according to FIG. 3, the springy core piece 14 has instead of the rubber-elastic element 22 a compression spring 26 which extends through the through bores 21a to 21d of the bodies 15a to 15d not shown in FIG. 3. The compression spring 26 is supported at its ends on counterwashers 27, 28 which are each slipped on a threaded bolt 30, 31 and fixed by nuts 32, 33 screwed onto the threaded bolts 30, 31. The threaded bolts 30, 31 are interconnected by a cable 34 extending through the helical spring 26. At their ends onto which the nuts 32, 33 are screwed, the threaded bolts 30, 31 protrude out of the end bodies 15a, 15d to permit adjustment of the compression and thus the stiffness of the compression spring 26.
FIG. 2 shows only two middle bodies 15b, 15c. However, in reality more middle bodies are preferably used, for example three to eight. The length of the middle bodies 15b, 15c without projections 19b, 19c can be for example 0.5 to 3 cm.
Patent Application
20070277439
