Ventilation – Workstation ventilator – Movable
Patent
1996-10-24
1998-04-07
Joyce, Harold
Ventilation
Workstation ventilator
Movable
F23J 1102
Patent
active
057357374
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an electric current carrying device at exhausting devices for exhausting or sucking-out unhealthy gases, preferably exhausts from vehicles, whereby the exhausting device includes a guide rail for a travelling crab or carriage, whereby the guide rail includes at least one sealing strip which seals or closes lower portions of said guide rail, whereby the interior of the travelling crab communicates with the interior of the guide rail and is capable of moving away the sealing strip when said crab travels along said guide rail, whereby a gas conduit is provided on the travelling crab for removal of the unhealthy gases, preferably the exhausts from vehicles, through the travelling crab and the guide rail, whereby a device operable by means of electric current and located on the travelling crab and/or on the gas conduit provided thereon is operable through a current circuit including electric current carrying lines which extend along the guide rail and which are connected to a source of current, whereby the current circuit further includes electric current carrying lines which are provided on the travelling crab and which are connected to the device operable by electric current, whereby the electric current carrying lines on the travelling crab through sliding contacts are in electric current transmitting contact with the electric current carrying lines extending along the guide rail and whereby the device operable by electric current is an electromagnetic device for fastening the gas conduit to a vehicle so that exhausts from the exhaust pipe of the vehicle can be sucked thereinto.
Devices of the abovementioned type are already known and can be described as a combination of our U.S. Pat. No. 4,233,889 regarding the guide rail with travelling crab and U.S. Pat. No. 5,162,017 relating to the electromagnetic device for fastening the gas conduit to a vehicle.
At said prior art devices the electric current carrying lines consist of self-supporting profiled rails which are placed beside the guide rails and connected thereto by means of brackets. These profiled rails must be straight for enabling the sliding contacts on the travelling crab to engage said profiled rails when said crab travels along the guide rail. In order to ensure that the profiled rails are sufficiently straight to fulfill the abovementioned object, it is required that said rails are profiled and dimentioned for obtaining the required rigidity, which means that they are expensive. Furthermore, special brackets are required for fastening the profiled rails on the guide rail. The brackets must be isolating against the guide rail and it is an extensive work to mount said brackets. Also, the necessity of these brackets and the mounting thereof are costly factors.
The object of the present invention has been to eliminate these drawbacks and, at first hand, provide an electric current carrying device at a lower price. This is arrived at according to the invention while the device initially defined principally has received the characterizing features of subsequent claim 1. By means of these characterizing features, the electric current carrying device becomes substantially less expensive than previously but also that said device is easier to assemble and transport.
The invention will be further described below with reference to the accompanying drawings, wherein
FIG. 1 is a perspective view illustrating an exhausting device having an electric current carrying device according to the invention;
FIG. 2 is a section II--II through the device of FIG. 1;
FIG. 3 is a magnification of a portion of the section of FIG. 2;
FIG. 4 is a plan view of a coiled up metal tape forming part of the electric current carrying device of FIG. 1; and;
FIG. 5 is a sectional view of parts of the device of FIG. 1 with an electric current device of alternative construction; and
FIG. 6 is a sectional view of parts of the device of FIG. 1 with an electric current device of another alternative construction.
The drawing figures illustrate an exhausting de
REFERENCES:
patent: 3855941 (1974-12-01), Fromme et al.
patent: 4233889 (1980-11-01), Nederman
patent: 4660465 (1987-04-01), Jentzsch et al.
patent: 4724751 (1988-02-01), Jentzsch et al.
patent: 5162017 (1992-11-01), Nordin
AB Ph. Nederman & Co.
Joyce Harold
LandOfFree
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