DE2832730A1 - DISPLAY MODULE IN A FIRE HAZARDOUS ENVIRONMENT - Google Patents

Description

Gilbarco Limited, Crompton Close, Basildon, Essex SS14 3B-A-, Great Britain

Display module in a flammable environment

The invention relates to display modules with seven segments for dispensing pumps for liquid fuel, which such modules and relates to the reshaping of liquid fuel dispensing pumps with mechanical indicators, around them with display arrangements using the modules with With the help of forming equipment kits.

According to the invention, a display module with seven segments is provided, which can be used in a dispensing pump for liquid fuel, the display devices with the seven segments being arranged in a block or a housing and being connected to a cable which comes from the block or the housing protrudes and is firmly attached to this; wherein the base or the housing has a transparent surface through which the display device with the seven segments can be seen, and two complementary half-shells. or half-shells which are connected and / or sealed together, and wherein the block or the housing together with which is inert to gasoline vapor from this protruding cable and the block and cable have sufficient impact resistance and tightness in such a way that according to the standards of the British

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Standard Specifications 4683, Part 3, 1972 that the escape of Franconia or ignition from within is prevented “The forms of impact resistance, tightness and resistance to steam make the module suitable for installation in an environment that contains benzine vapors, such as ZoB. into the interior of a petrol pump »It is advantageous if the two complementary half-shells or half-shells are made of transparent plastic that is glued together. It has been found that a particularly suitable plastic material is a transparent diaminoterephthalate polyamide, and when such a material is used the two half-jackets can be bonded together or ultrasonically welded together.

In a preferred embodiment of the module described below, the cable is a flat-clad cable. Conveniently, the cable protrudes from the block or the housing between its half-sheaths through a slot which is ge through a recess in at least one of the half-sheaths , wherein the flat cable cladding is compressed and tightly clamped or held in the slot, and further the clamping and holding can be improved if at least one or both opposite walls of the slot with a Sägeζahneinschnitten and Ver are formed teeth which are aligned or is in that the cable cover is held against a Auswärtszug.

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In one embodiment of the module is a printed circuit board, which carries multiple seven segment filament indicators mounted in the block or housing.

However, the invention is not limited to the use of filament display limited to seven segments: It is also possible to e.g., light emitting diodes or liquid crystal display devices provided that proper attention is paid to the visibility of the display in bright ambient conditions is.

The display modules can conveniently be used within the delivery pumps for liquid fuel -be used, the modules are arranged in such a way that, for example, a new display of the Price and / or de «Voluaene according to the liquid flow are / is provided by the pump. Xn more expedient One pump can, for example, supply two or four such medules match, cash and / or price on one side or both opposite sides of the pump. .

The display modules can be part of conversion equipment kits form, which are expedient to dispense pumps for liquid fuel, which are equipped with a mechanical display device are to be converted to at least partially electric operation *

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Among such dispensing or dispensing pumps for liquid fuel There are pumps that have a flow meter operatively coupled to a liquid fuel line to rotate a shaft, the speed being fixed or set Has relationship with respect to the volume of liquid passing through.

A gear with a suitable, controllable ratio in these pumps operates all mechanical counting displays accordingly the gear speed required to display the price and volume of fuel drawn. Such a device is incorporated into, for example, a well-known dispensing pump known in the trade as "Veeder Root Models 58D and 101. Liquid fuel dispensing pumps are also exemplary in British Patent Application No. 963 172.

For a variety of reasons a device must have such a facility replaced or replaced. Rapidly rising prices lead to the conclusion that the numbers that must be displayed for the capacity or capacity of the mechanical gears and / or displays are too large or soon become too big. The corresponding operation at increased speeds also causes a greater abrasion speed of the Furnishings.

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Liquid dispensing pumps with electronic digital displays are known. The complete replacement of an existing one However, facility is often economically undesirable and wasteful.

Conversion device kits with display modules according to the invention can be used to replace a worn and / or obsolete device in older pump types as described above, enabled by an electrical digital display device in accordance with the standards currently required to be replaced without the need to replace all of the fuel pumps.

According to the invention is therefore also a kit for a forming device intended for the installation and operation of electrical display modules with seven segments in a delivery pump for liquid fuel, including a display module with seven segments according to the invention and one electrical device, which is contained in a fire-proof container, for driving the display module under response for pulses that correspond to the flow of liquid through the pump. The kit can also include a battery pack have for the creation of a source of auxiliary staff for the display module and a motor switching module. The kit can also have a pulse generator for the Generation of electrical pulses in response to the

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Rotation of a shaft in accordance with the flow of liquid through the pump, the pulse generator being operatively coupled to the electrical device for driving the display module. The need or the like for such a pulse generator or such pulse generators in any given kit is determined by its presence or absence in the pump to be converted: These mechanical pumps, which have been converted to self-service operation, often have a pulse generator for driving an electrical one display at a remote location to as Z ₀ in the kiosk as a cashier.

In the kit, an electric display, such as "cash and / or volume display can also be intended to two opposite sides of the reshaped ^D ump install. Accordingly, the kit can, for example, two or four seven segment display modules operatively coupled to the electrical device.

Other advantages, features and uses of the present Invention emerge from the following description in conjunction with the drawings. There is a preferred one Embodiment of the invention described. Show it:

Figure 1 is a schematic view of a forming device for a dispensing pump for liquid fuel according to an embodiment of the invention,

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Figure 2 and 3 schematically a plan view and side view, respectively a display module with seven segments, as used in the device of Figure 1, and

Figure h and 5 in an exploded and broken representation, the side view / plan view of a flame-proof housing arrangement as used in the device of Figure 1, Figure 5 being seen in the direction of arrow A in Figure k .

In the drawings, the same reference numerals denote the same Parts.

Figure 1 shows a kit suitable for converting a gasoline pump having mechanical display assemblies to having electrical display assemblies with seven segments. The kit has four 4s or 5 digit display modules with seven segments, which have a structure as described in connection with FIGS. 2 and 3 in particular. This allows the modules to be used safely in locations that contain flammable vapors, such as inside a gasoline pump. The display modules with seven segments 1 and 2 are intended to display the sales price according to the liquid flow through the pump. The seven segment display modules 3 and h are provided for displaying the corresponding fluid volume. Modules 1, 2, 3 and k are operationally characterized by flat,

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sheathed cables 5 contained in gasoline in an expedient manner Environment usable and described in more detail below are connected to a flame-proof housing 6, which is described in more detail with reference to FIGS will.

The pulse generators 7 and 8, which are connected by cables of round cross-section to the housings 6, are intended for use in connection with shafts rotating at speeds corresponding to the fluid flow through the pump, with different transmission speeds to provide rotation that can be used to drive the display modules and display the sales price or volume. In addition, cable connections are provided between the housing 6 and a reset switch 9> from a motor switching module 9a (not shown) and from a flameproof, enclosed power supply 10. A battery pack, pack or stack 10a is connected to the power supply 10 to provide an auxiliary power source for at least the display modules 1, 2, 3 and h . An outlet cable 11 from the housing 6 ensures that pulse signals can be picked up at a remote display location, for example the cashier's kiosk.

The electronic circuitry which is suitable for the conversion device does not in itself constitute part of this invention A suitable circuit is known. General are

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ORIGINAL INSPECTED

electrical arrangements for an electrical digital display in liquid fuel dispensers, for example in U.S. Patent 3,809,866 and in British Patent 1 ^ 52353 described. Pulse generators are known parts of an apparatus and are described, for example, in U.S. Patent 3,814,934. Electrical arrangements for a converter are also in U.S. Patent Application Serial No. 738,562 filed Nov. 3 Described in 1956. Commercially available and well-known Mechanical gauge gasoline pumps, which are items suitable for forming, are known as the Veeder Root Models 58D and 101.

When using the conversion kit shown, Removed the original mechanical display counter dials from the pump and the corresponding parts of the kit are attached to the site using suitable fastening devices. The pulse generators are installed and form part of the kit where they are not already in the pump to be converted available.

FIG. 2 and 3 respectively show a top view and an end view of a display module as used in the conversion device of FIG will. The module, generally designated I5, has five devices 16 with seven segments having filaments and on a printed circuit board with associated diodes are mounted. The whole thing is mounted in a transparent housing and visible through this, consecrated two half-

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Has jacket 18 and 19, which are firmly connected to each other are.

The housing and its half-shells are molded from a transparent polyamide terephthalate plastic, a material available on the market under the Trogamid T trademark. The two half-shells are connected _{using an appropriate method, Z 0} B ₀ through the use of a 30% DMF (dimethylformamide) solution of the same plastic or alternatively by gluing or ultrasonic welding »The wall thickness of the two half-shells or half-shells is about 3 mm. The surface of the case through which the indicators are visible is polished smooth, either by molding in a polished mold or by polishing after molding or molding.

A flat-clad multiple cable protrudes from the housing (it leads to the flame-proof housing 6 according to FIG. 1). The cable 20 is an i6-core ribbon cable, which is surrounded by a rectangular plastic cover that is resistant to gasoline vapor. The cable 20 has cross-sectional dimensions of approximately h χ 23 mm when it is not compressed. The cable 20 extends out of the housing 15 via a rectangular slot 21 which is formed by a recess in a half-jacket 18 (or in another embodiment is formed in each of the half-jackets). The slot has cross-sectional dimensions that are / ^ 0.36 mm in

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in each direction are slightly smaller than the uncompressed dimension of the cable. Thus, the cable cladding is in compressed into the structure and clamped or held firmly in the slot. The opposite walls 22 and 23 of the The slot has sawtooth cuts or serrations parallel to the short sides of the housing to make another To provide clamping of the cladding of the cable 20. The length of the cable compressed by the slot, i. the depth of the slot is about 19 mm. This compression creates the possibility that the assembly or the arrangement has sufficient tightness so that safe use within an environment which is flammable Contains fumes is possible without the risk of sparks from the electrical device inside the housing ignite surrounding material. The maximum power dissipation of the display devices in the housing when all eight are shown is about 6 watts in this example.

The complementary half-jackets 18 and 19 are complementary Pins and sockets are provided for space during assembly and can be either integral for assembly purposes have shaped tenons or threaded bolts or mounting holes going through the shells (provided with walls, to seal the inside of the case)

The flameproof housing. 6 is shown in Fig. 5 h and the conversion kit of FIG.

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FIG. H shows an exploded view, and FIG. 5 shows a top view of a metal die-cast housing 25 with cover 2.6 in the direction of arrow A in FIG Cross-section and / or plug (not shown) to form a flameproof housing structure.

When assembled, the conduits and ribbon cables 5 extend out of the assembly through corresponding rectangular slots and circular holes 28. The holes are formed in a cover 26 and the slots are formed through recesses 29 in the cover 26 and through the complementary, mating flange 30 of the body 25. The dimension of the resulting slots is slightly larger than that of the slots described above with reference to the display module of Figures 2 and 3 in order to provide an adaptation for the collars 27, which are preferably made of aluminum , are fitted over the cables 5 and are preferably glued to them. The collars 27 are arranged in the slots, which have a depth of about 25 mm between the inside and outside of the closure, and they provide flame protection according to BSS 4683, Part 2, 1972 between inside and outside the housing. Thus, the flat, lined ribbon cables are not compressed in the slots or collars, thereby providing a flame-proof seal.

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ORIGINAL INSPECTED

The degree of compression imparted to the flat, lined ribbon cable in the module of Figures 2 and 3, as well as the degree of contact between the ribbon cable collar and the slot in the arrangement of Figures h and 5 are important in order to minimize the possibility of that a spark or an ignition process runs along the gap between the slot and cable or between the slot and collar. The dimensions used in the embodiment result in sufficient compression to narrow the gap, but not sufficient for an excessive deformation or deformation of the cable casing or the collar, which leads to a loss of contact at the places between the cable casing and the collar and the Wall of the slot would lead, thus reducing the effective length of the narrow gap.

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Claims (12)

Claims Display module for a pump for dispensing liquid fuel with seven segments, characterized in that that the display device with the seven segments is arranged in a block or a housing and is connected to a cable which extends out of the block or the housing and is fixed to it is attached that the block or the housing has a transparent surface through which the device with the seven segments can be seen, and has two complementary half-shells or half-shells, which with- / 2 909807/0822 are connected to each other and / or sealed and that the block or the housing together with the protruding from this. Cables are inert to petrol vapor, and a sufficient impact resistance and impermeability, are such that in accordance with the standards of the British Standard Specifications 4683 "Part 3" 1972, the escape of a spark or ignition is prevented from within _e 2. Module according to claim 1, characterized in that the two complementary half-jackets are made of transparent plastic, which are connected to each other by glue. 3. Module according to claim 2, characterized in that the plastic material is a transparent Diamincterephthalatpolyamid and the two half-jackets are connected to one another by gluing or welded together by ultrasound. 4. Module according to one of claims 1 to 3 »characterized in that the cable is a flat-clad multiple cable. 5 « module according to claim 4, characterized in that the cable protrudes from the block or housing between its half-sheaths through a slot which is formed by a recess in at least one of the half-sheaths, and that the flat cable cladding is compressed and tight in the slot is clamped or held. / 3 909807 / ^/ 082 2 283273Q 6th module after. Claim h, characterized in that at least one or both opposite walls of the
Slots are formed with sawtooth incisions or a toothing, which are aligned or is,
that the Kabelverkl eilung is held against a train to the outside. 7 ". Module according to one of Claims 1 to 6, characterized in that that the complementary half-sheaths complementary adjustment pins or projections and recesses for the Exhibit ease of assembly, 8. Module according to one of claims 1 to 7 »characterized in that a printed circuit card © several glow« carries thread display devices with seven segments and. is fixed in the block or housing. 9. Module according to one of claims 1 to 8, characterized in that that it is operationally connected to a dispensing pump for a liquid fuel that depending on the Fluid flow through the pump is given a numeric display. 10. Module according to one of claims 1 to 9 »characterized in that that two or four display modules are provided. 909807/0822 " L _ 283273Q 11. Module according to one of claims 1 to 9 »characterized in that it is in a kit of an order forming device
is provided and the electrical device is arranged in a flame-proof housing in such a way that the display module can be driven in response to pulses which correspond to the flow of liquid through the pump, 12. Module according to claim 11, characterized in that a Battery pack as a replacement power supply © for the display module and a motor switch are also provided. 13 · E-iodized salt according to claim 12 or HJ ₉ gekenaszaieMseit by one sur Srseugüsig voss alektarisctoes impulses, nntmv on the © ^ «äavmg eis ©? Wave corresponding to that through the Pvmp ^ _e »obei the Impulstoetrieblicii» ± t the electrical device for since «driving the AnseigesioöHls is coupled» Module according to one of Claims 11 to 13, characterized in that that two or four Änaigeseaoduln With seven Segnents are operationally coupled to the electrical device. 809807/0822