GB1568522A - Machines for playing a game of chance - Google Patents

Machines for playing a game of chance Download PDF

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Publication number
GB1568522A
GB1568522A GB3893776A GB3893776A GB1568522A GB 1568522 A GB1568522 A GB 1568522A GB 3893776 A GB3893776 A GB 3893776A GB 3893776 A GB3893776 A GB 3893776A GB 1568522 A GB1568522 A GB 1568522A
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United Kingdom
Prior art keywords
display
symbols
subsidiary
machine
reels
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Expired
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GB3893776A
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White M
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Priority to GB3893776A priority Critical patent/GB1568522A/en
Publication of GB1568522A publication Critical patent/GB1568522A/en
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    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07FCOIN-FREED OR LIKE APPARATUS
    • G07F17/00Coin-freed apparatus for hiring articles; Coin-freed facilities or services
    • G07F17/32Coin-freed apparatus for hiring articles; Coin-freed facilities or services for games, toys, sports or amusements, e.g. casino games, online gambling or betting
    • G07F17/326Game play aspects of gaming systems
    • G07F17/3262Player actions which determine the course of the game, e.g. selecting a prize to be won, outcome to be achieved, game to be played
    • G07F17/3265Influencing the position of stopped moving members to achieve a winning arrangement, e.g. nudging, shuffling, holding

Description

(54) IMPROVEMENTS IN OR RELATING TO MACHINES FOR PLAYING A GAME OF CHANCE (71) I, MICHAEL GEOFFREY WHITE, a British Subject, of Flat 10, Chichester House, Citadel Road, Plymouth, Devon, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement: The present invention relates to a machine for playing a game of chance, and particularly to such a machine which incorporates a coin or token freed mechanism and in which there is provided a further mechanism for introducing an element of operator skill into the game.

Machines of the type to which the present invention relates are commonly referred to as "Fruit machines". In such machines a plurality of symbols in a plurality of groups are displayed in sequence, and arrested in a random or pseudo-random fashion.

In general a coin or token freed mechanism which releases the sequential display mechanism to start the display sequence is associated, in the machine, with a coin store and an arrangement for determining, when the sequential display has been terminated, whether or not the combination of symbols displayed at the end of play represents a win , in which case the coin store is opened to feed out some or all of the coins therein.

Two main types of display apparatus are known, one comprising a plurality of reels having symbols marked around their peripheries, a part of the periphery of each of which reels is visible through an opening or a plurality of openings in a casing, the index position of the reels when they are stationary determining which of the symbols are visible through the opening or openings in the casing and also whether or not a winning combination has been achieved. In the other type of apparatus, the display comprises a plurality of groups of fields or display areas, usually arranged in three or four columns of such fields, which are illuminated in sequence when the machine is operating, one member of each group being illuminated at any one time.Again, the sequencing of illumination is arrested in a random, pseudo-random or at least irregular fashion, and the position of the fields illuminated after arrest of the sequencing determines whether or not a "win" has been achieved.

Such machines are clearly games of chance. and the selection of symbols displayed when the sequencing has terminated is entirely out of the control of the player.

Attempts have previously been made to introduce an element of skill into the operation of the machines to make them more attractive. Such symbols include "re-spin" arrangements, "hold" arrangements and incremental advance arrangements. In the first of these a button which is selectively operable by the operator releases one or more of the groups of symbols for a further sequencing, and the sequencing is again terminated in a random or pseudo-random manner. Thus, if, say, two out of three groups have a terminal alignment representing a part of a winning combination, the third group can be re-sequenced giving the operator another chance (with better odds) to obtain a winning combination. The "hold" arrangement is similar to this in that the whole mechanism is re-energised, and a control switch or button can be operated selectively to determine when the sequencing is to be terminated.This latter involves a great degree of skill since the machine is under the direct control of the operator as far as the termination of the sequencing is concerned. However, in view of the speed at which sequencing take places, it is very difficult for an operator accurately to control the termination of sequencing really to have a chance of stopping the sequencing where desired.

The latest introduction of an incremental advancing mechanism to some extend remedies this disadvantage. The incremental advancing mechanism controls any group of symbols and, when energised, can be actuated to cause any one group of symbols to advance incrementally so that a greater degree of control of the terminal positions of the symbols can be exercised. Of course, to retain an element of chance in the game, the incremental advancing mechanism is not always energised, and even when energised is only energised for a limited period so that an operator must decide which group of symbols is to be advanced incrementally, and how many increments to advance it in order to obtain the desired winning combination, in a rather limited time.

In machines of the type having a display panel where all the symbols are simultaneously exposed, and the position of the terminal symbol in the sequence indicated by, for example, illumination of that symbol, this is a very practical arrangement, but in the more conventional machines in which the displayed symbols are carried at the peripheries of reels which are exposed through openings in the casing, it is only possible to see the displayed symbol and each symbol to either side of the displayed symbol: this means that a rational decision on the group of symbols to be advanced by the incremental advancing mechanism in order to achieve a desired winning combination cannot be made.

According to the present invention there is provided a machine for playing a game of chance, having a main display for displaying a plurality of symbols, one from each of a plurality of groups, the symbols of each group being displayed in sequence during operation of the machine, means for arresting the sequencing of each group of symbols of the main display in a random or pseudorandom manner leaving one member of each group displayed to determine a final combination of symbols at the end of play, and a subsidiary display spaced from the said main display on a display panel of the machine, the subsidiary display incorporating means for displaying a plurality of symbols arranged in a sequence identical with that of at least a part of at least one group of the said main display in synchronism with the corresponding symbols of the main display of that group.

A machine made as an embodiment of the present invention may also have a subsidiary control mechanism selectively operable to cause one or more groups of symbols to be advanced incrementally through its display sequence.

In one embodiment of the invention the main display comprises a plurality of reels bearing a plurality of symbols on their peripheries, the symbols on the periphery of any one reel constituting one of the said groups of symbols, the periphery of each reel being visible through an opening in the casing of the machine which exposes only sufficient of the reel for three symbols to be viewed at any one time. The symbol of the three displayed in any one group which is relevant in determining whether or not the combination displayed is a winning combination is indicated by a line known as the combination line, but sometimes termed the "pay line".

In such an embodiment it is preferred that the subsidiary display comprises a plurality of fixed display fields arranged in groups and bearing symbols corresponding to the symbols of associated groups of the main display, and means for illuminating or otherwise indicating the display field of each group of the subsidiary display bearing the same symbol as that of the corresponding group of the main display exposed on the combination or pay line at that time through the said opening in the casing. Alternatively, however, the subsidiary display may comprise a plurality of reels similar to the reels of the main display, but exposed through the casing of the machine so that a plurality of symbols can be seen at any one position of the reel, whereby a greater number of symbols of each group is visible.

It is preferred that the subsidiary control mechanism is enabled in a random or pseudo-random manner after the sequencing of the main display has terminated during play. Likewise, it is preferred that visual and/or audible indicator means are energised when the said subsidiary control mechanism is energised.

It is also preferred that such machines should be provided with at least one control switch for selectively terminating sequencing of the symbols of an associated group or preventing subsequent sequencing for a limited time period. This control switch is termed a "hold" button; such "hold" buttons are usually provided one for each group of symbols and are enabled, again for limited time periods, in a random or pseudo-random fashion, there being lights or buzzers which operate to indicate when the "hold" buttons are enabled.

One embodiment of the present invention will now be more particularly described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a schematic view of a front panel of a machine constructed as an embodiment of the present invention; and Figure 2 is a schematic view of an operating mechanism for the embodiment of the invention shown in Figure 1.

Referring now to the drawings, in Figure 1 there is shown a display panel of a fruit machine according to the invention, in which there is a first or main display 211 constituted by an opening in the casing through which are visible the rims of three reels 212, 213, 214 bearing symbols which can be seen through the opening. In use of the machine the three reels rotate to display the symbols sequentially, and are arrested automatically one by one in a random or pseudo random manner by the tripping of associated solenoids in a manner which will be described in greater detail below in relation to Figure 2.

Above the main display 211 is a subsidiary display 215 in the form of three columns of display fields, each field bearing a symbol and each column representing a group of symbols corresponding to the group of symbols on the periphery of an associated reel 212, 213, 214. As the reels 212, 213, 214 rotate, the fields in the subsidiary display area 215 are illuminated so that the position in the group of the exposed symbol on the rim of each of the reels 212, 213, 214 can be established by reference to the subsidiary display. Also on the front panel of the machine is an indicator light 216 which is illuminated when the subsidiary control mechanism is energised.The machine is also provided with "hold" buttons 217 of a known type, for tripping the solenoids to cause termination of the sequential display of the symbols by stopping rotation of the reels 212, 213, or 214 respectively (if they are already turning), or to prevent rotation of the reels 212, 213, 214 during the next spin, and subsidiary control elements in the form of buttons 218 which cause, upon depression, advance of the reel associated therewith by one or more symbol positions.

The subsidiary control mechanism is prefer ably of the type in which if the buttons 218 are held depressed in the operated position, the reels continue to rotate until the button is released. A mechanism for achieving this is shown in Figure 2 in which there is shown an indexing disc 11, carrying a wiper 12, having spaced around its periphery a plurality of notches 13. Mounted coaxially with the indexing disc 11 is a symbol reel 212 which is linked to the indexing disc 11 for rotation therewith. The wiper 12 of the indexing disc 11 cooperates with a further contact disc 32 having a plurality of contacts arranged in a circle to be contacted sequen tially by the wiper 12 as the disc 11 rotates.

Each of the symbol reels 212, 213 and 214 has a similar indexing arrangement, but for simplicity the mechanism will be described herein only in relation to the symbol reel 212. The indexing discs 11 and associated symbol reels 212, 213, 214 are carried, in a known way for such machines, on a com mon shaft 11a to which they are linked by respective slipping clutches (not shown), the shaft 11a being driven by an electric motor (not shown) at all times when a game is in progress.

Associated with each notched indexing disc 11 is an indexing arm 14 pivoted at one end, 16, and having a laterally projecting tooth 15 at the other. At a mid point along its length the indexing arm 14 is joined to an operating plunger 18 of a solenoid 17 which is biased to its extended position by a spring 19. The solenoid 17 is held on a fixed framework (not shown) of the machine so that when it is de-energized the tooth 15 of the indexing arm 14 is pressed against the surface of the indexing disc 11. If, as is usually the case, the indexing disc 11 is turning when the solenoid 17 is released, then the tooth 15 will enter one of the notches 13 to hold the disc 11 and thus the symbol reel 212 in one of its indexing positions exposing one of the symbols on the periphery of the reel through the opening 211.

The solenoid 17 is operated by a relay 20 fed with control signals from a control mechanism 21 which may be of a conventional type incorporating a plurality of cams turned by a motor which, like the motor driving the shaft on which the reels 212, 213, 214 are mounted, is continuously turning when the machine is in operation. The position of the cams when the machine is energized to commence a game is therefore indeterminate so that the number of revolutions of the disc 11 between commecing a normal automatic game and termination due to operation of the cams in the control mechanism 21 is different each time.

The machine also incorporates a subsidiary motor 22 also driven for the duration of play and driving a wiper disc 23 having a wiper 23a which contacts in sequence a ring of contacts on a contact support plate 23b.

The motor 22 is not driven continuously, however, as are the motors driving the camshaft of the control mechanism 21 and the main shaft carrying the reels 212, 213, 214, but operates only while the solenoids 17 are energised by the output from the control mechanism 21. As soon as the solenoids 17 are de-energized the motor 22 stops to determine an indexed position of the wiper 23a of the wiper disc 23 on the contact plate 23b. Various of the contacts of the contact plate 23b are connected together and to one contact of a normally open microswitch 27 the other contact of which is connected to one contact of a push button switch 28 having an operating push button 30. The microswitch 27 is controlled by an operating lever 26 in the form of a cam follower which engages a cam 25 driven by a motor 24. The cam 25 has a single lift profile extending over approximately half its cir cumference.When the cam follower 26 is lifted up onto the lift profile of the cam 25 the microswitch 27 is closed thereby energizing the push button switch 28. Connected in parallel with the push button switch 28 is a lamp 29 which is thus illuminated when the push button switch 28 is energized, and dark when the push button switch 28 is not energized.

The motor 24 is controlled by an output from the normal mechanism 21 of the machine which provides an output control signal to the motor 24 for a predetermined period, for example five seconds, immediately after all the solenoids 17 have been energized at the end of a period of play: the control signal from the control mechanism 21 fed to the motor 24 is also fed to the wiper 23a which engages the contact plate 23b so that current can flow to this wiper and therefore from the contact plate 23b to the microswitch 27 only when the motor 24 is turning.

The contacts on the fixed contact disc 32 engaged by the wiper 12 of the indexing disc 11 are each connected by wires (not shown) to respective associated fields of the subsidiary display 215 whereby to illuminate one of the lamps of the subsidiary display of the machine when the wiper 12 of the indexing disc 11 is in contact therewith. The lamps of the subsidiary display 215 are conveniently positioned behind respective openings or transparent regions in a screen. Illumination of a lamp thus provides corresponding illumination of a display field of the subsidiary display of the machine so that the symbol on that field is clearly shown up, as well as its position in the sequence of symbols of that group.

The machine described above operates as follows: when the machine is operating the motor driving the control mechanism 21 is continuously rotating so that the cams on the shaft driven by the motor are continuously turning. This ensures that when a coin or token is inserted into the coin freed mechanism which initiates play the position of the cams are indeterminate. The coin freed mechanism (not shown) energizes the relay 20 and starts the motor which drives the main shaft 11a carrying the reels 212, 213, 214 so that the wiper discs 11 all commence to rotate and the symbols visible on the part of the periphery of each symbol reel 212, 213, 214 exposed through the opening 211 are advanced through their sequence by rotation of the symbol reels 212, 213, 214.The solenoids 17 are sequentially de-energized by the control mechanism 21 and when all have been de-energized a signal is fed out to the motor 24 to cause this to turn for its predetermined period, say, five seconds. The cam 25 is linked by a reduction gear to the motor 24 so that it turns one revolution every ten or eleven seconds such that for each energization period of the motor 24 the cam 25 turns something less than half of one revolution.

While the solenoids 17 are energized, the motor 22 is also energized. and it comes to rest when the solenoids 17 are all deenergized with the wiper on one of the contacts of the contact plate 23b. If the contact on which the wiper comes to rest is not one of those connected to the microswitch 27 the motor 24 merely runs for its period of five seconds and then operation of a win determination circuit (not shown) is initiated to determine whether the disc 11 are indexed to a winning combination.

If, on the other hand, the wiper disc 23a comes to rest with the wiper 23a in contact with one of the studs which are connected to the microswitch 27, then the microswitch 27 will be energized, and will pass current to the lamp 29 and push button control switch 28 for that part of the period during which the motor 24 rotates when the cam follower 26 is lifted by the rise on the cam 25. The length of time during which this occurs will depend, of course, on the angular position of the cam 25 when the solenoids 17 are released and this, because the motor 24 is energized at the end of each game, will be indeterminate.If, for example, the cam follower 26 has only just been lifted onto the rise of the cam 25, then the microswitch 27 will be closed for substantially the whole of the five second period so that the lamp 29 will be energized for all of this period as will the push button contact switch 28. Depression of the button 30 will thus feed current from the closed contacts of the microswitch 27, through the contacts of the push button switch 28 to the control terminal of the relay 20 to energize the solenoids 17 and permit further movement of the indexing disc 11.

The length of time for which the push button 30 is depressed will determine how far the indexing disc 11 and thus the associated symbol reel 212 advances: for example, a short depression will permit the disc 11 to advance only by one notch, therefore incrementally advancing the symbol reel by an angular amount equal to one symbol, whereas maintaining the button 30 depressed for a longer period will allow two or three notches to pass thereby advancing the display by two or three symbols in the sequence. A similar push button is provided for each of the solenoids 17 of the symbol reels so that selective advancement of any or all of the groups of symbols may be effected.

Thus, if when the game terminates the lamp 29 lights up, the player can determine by reference to the subsidiary display whether advancement of one or more of the symbol reels could bring the combination displayed to a winning combination and how far the symbol reels must be turned to achieve this. It will be appreciated that this information cannot be derived from the symbol reels themselves since only the indexed symbols, and perhaps the symbol or part of the symbol on either side of it are exposed through the opening 211. Thus, if the lamp 29 is illuminated, indicating that the push button switch 28 is energized, the player may depress the switch for an appropriate length of time in an attempt to advance the symbol reels to a winning combination if there is sufficient time for this while the microswitch 27 is closed.

Because the position of the cam 25 at the termination of each game is different, and because the microswitch 27 is not energized at the termination of every game, the length of time for which the microswitch 27 is energized is different each time, varying from a very brief, fractional second interval to a period of up to five seconds. Moreover, since the wiper 23a is energized by the same signal as energizes the motor 24, the microswitch 27 can only be energized while the motor 24 is turning so that should the motor come to rest with the cam follower 26 on the rise of the cam 25 the microswitch 27 is de-energized anyway, thereby de-energizing the push button control switch 28 even though the switch contacts of the microswitch 27 are closed.

In a further embodiment (not shown) the subsidiary display comprises a further plurality of symbol reels rather than a static display field, the symbol wheels being exposed over a larger part of their periphery than the corresponding symbol reels of the main display so that, again, an appropriate decision can be made on which symbol reel is to be advanced when the subsidiary control mechanism is energised. The lamp 216 may be illuminated upon energization of the incremental advance mechanism, or may merely be energized when a potential winning combination is in the field of view of the subsidiary display.

To make the game more interesting, the motor driving the shaft 1 1a may be controlled, when the push button switch 28 is closed, to run at different speeds, either in a random fashion by using a control rheostat in a construction similar to the wiper disc 23a, and contact plate 23b which control the energization of the switch 27, or by a control circuit of a type known in itself, which increases the speed of the motor driving the shaft 11a if the push button 30 is held depressed. This could be achieved, for example, by a control rheostat connected to the drive shaft of the motor and energized only upon depression of the push button 30, the control rheostat controlling the motor driving the shaft.Such a system could also be used, of course, to obtain cyclic variation of the speed of the motor if the length of time taken to rotate the rheostat through it full range is less than the maximum length of time for which the push button 30 is energized under the control of the cam 25 and motor 24.

The subsidiary display may, of course, display symbols corresponding to only one group and/or may display less than the whole of the or each group so that it can only be used for part of the rotation of one of or each of the reels 212, 213, 214. In this case, instead of being a fixed field display, the subsidiary display may be in the form of reels, synchronised with the reels 212, 213, 214 respectively and bearing the same markings over only a limited arc thereof. The lamp 216 may, in such an embodiment, be energized to flash on a warning that the marked sector of the subsidiary display reels is about to come into the field of view. This lamp may have three parts identifying the three reels of the subsidiary display.

WHAT I CLAIM IS: 1. A machine for playing a game of chance, having a main display for displaying a plurality of symbols, one from each of a plurality of groups, the symbols of each group being displayed in sequence during operation of the machine, means for arresting the sequencing of each group of symbols of the main display in a random or pseudorandom manner leaving one member of each group displayed to determine a final combination of symbols at the end of play, and a subsidiary display spaced from the said main display on a display panel of the machine, the subsidiary display incorporating means for displaying a plurality of symbols arranged in a sequence identical with that of at least a part of at least one group of the said main display in synchronism with the corresponding symbols of the main display of that group.

2. A machine as claimed in Claim 1 in which there is further provided a subsidiary control mechanism selectively operable to cause one or more groups of said symbols to be displayed through its display sequence.

3. A machine as claimed in Claim 2 in which the subsidiary control mechanism is operated by a subsidiary control element operation of which causes the display to be displayed continuously through its sequence until the subsidiary control element is released.

4. A machine as claimed in Claim 2 or Claim 3, in which there is provided an enabling mechanism operable to enable the functioning of the subsidiary control mechanism in a random or pseudo random manner after the sequencing of the main display has terminated during play.

5. A machine as claimed in any of Claims 1 to 4, in which the main display

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (13)

**WARNING** start of CLMS field may overlap end of DESC **. far the symbol reels must be turned to achieve this. It will be appreciated that this information cannot be derived from the symbol reels themselves since only the indexed symbols, and perhaps the symbol or part of the symbol on either side of it are exposed through the opening 211. Thus, if the lamp 29 is illuminated, indicating that the push button switch 28 is energized, the player may depress the switch for an appropriate length of time in an attempt to advance the symbol reels to a winning combination if there is sufficient time for this while the microswitch 27 is closed. Because the position of the cam 25 at the termination of each game is different, and because the microswitch 27 is not energized at the termination of every game, the length of time for which the microswitch 27 is energized is different each time, varying from a very brief, fractional second interval to a period of up to five seconds. Moreover, since the wiper 23a is energized by the same signal as energizes the motor 24, the microswitch 27 can only be energized while the motor 24 is turning so that should the motor come to rest with the cam follower 26 on the rise of the cam 25 the microswitch 27 is de-energized anyway, thereby de-energizing the push button control switch 28 even though the switch contacts of the microswitch 27 are closed. In a further embodiment (not shown) the subsidiary display comprises a further plurality of symbol reels rather than a static display field, the symbol wheels being exposed over a larger part of their periphery than the corresponding symbol reels of the main display so that, again, an appropriate decision can be made on which symbol reel is to be advanced when the subsidiary control mechanism is energised. The lamp 216 may be illuminated upon energization of the incremental advance mechanism, or may merely be energized when a potential winning combination is in the field of view of the subsidiary display. To make the game more interesting, the motor driving the shaft 1 1a may be controlled, when the push button switch 28 is closed, to run at different speeds, either in a random fashion by using a control rheostat in a construction similar to the wiper disc 23a, and contact plate 23b which control the energization of the switch 27, or by a control circuit of a type known in itself, which increases the speed of the motor driving the shaft 11a if the push button 30 is held depressed. This could be achieved, for example, by a control rheostat connected to the drive shaft of the motor and energized only upon depression of the push button 30, the control rheostat controlling the motor driving the shaft.Such a system could also be used, of course, to obtain cyclic variation of the speed of the motor if the length of time taken to rotate the rheostat through it full range is less than the maximum length of time for which the push button 30 is energized under the control of the cam 25 and motor 24. The subsidiary display may, of course, display symbols corresponding to only one group and/or may display less than the whole of the or each group so that it can only be used for part of the rotation of one of or each of the reels 212, 213, 214. In this case, instead of being a fixed field display, the subsidiary display may be in the form of reels, synchronised with the reels 212, 213, 214 respectively and bearing the same markings over only a limited arc thereof. The lamp 216 may, in such an embodiment, be energized to flash on a warning that the marked sector of the subsidiary display reels is about to come into the field of view. This lamp may have three parts identifying the three reels of the subsidiary display. WHAT I CLAIM IS:
1. A machine for playing a game of chance, having a main display for displaying a plurality of symbols, one from each of a plurality of groups, the symbols of each group being displayed in sequence during operation of the machine, means for arresting the sequencing of each group of symbols of the main display in a random or pseudorandom manner leaving one member of each group displayed to determine a final combination of symbols at the end of play, and a subsidiary display spaced from the said main display on a display panel of the machine, the subsidiary display incorporating means for displaying a plurality of symbols arranged in a sequence identical with that of at least a part of at least one group of the said main display in synchronism with the corresponding symbols of the main display of that group.
2. A machine as claimed in Claim 1 in which there is further provided a subsidiary control mechanism selectively operable to cause one or more groups of said symbols to be displayed through its display sequence.
3. A machine as claimed in Claim 2 in which the subsidiary control mechanism is operated by a subsidiary control element operation of which causes the display to be displayed continuously through its sequence until the subsidiary control element is released.
4. A machine as claimed in Claim 2 or Claim 3, in which there is provided an enabling mechanism operable to enable the functioning of the subsidiary control mechanism in a random or pseudo random manner after the sequencing of the main display has terminated during play.
5. A machine as claimed in any of Claims 1 to 4, in which the main display
comprises a plurality of reels bearing a plurality of symbols on their peripheries, the symbols on the periphery of any one reel constituting one of the said groups of symbols, the periphery of each reel being visible through an opening in a casing of the machine which exposes only sufficient of the reel for at most three symbols to be viewed at a time.
6. A machine as claimed in Claim 5, in which the subsidiary display comprises a plurality of fixed display fields arranged in groups, the display fields of each group bearing symbols corresponding to the symbols of an associated group of the main display, and means for illuminating or otherwise indicating the display field of each group of the subsidiary display bearing the same symbol as that of the corresponding group of the main display exposed at that time through the said opening in the casing.
7. A machine as claimed in Claim 5, in which the subsidiary display is in the form of reels bearing symbols at their peripheries in groups corresponding to the groups of symbols on associated reels of the main display, the reels of the subsidiary display being exposed through an opening or respective openings in the casing of the machine over an arc which is sufficiently large for a plurality of symbols on any one subsidiary reel to be viewed at once, the reels of the subsidiary display being linked in phase with the reels of the main display, whereby the subsidiary display exposes those symbols next in the sequence of the symbol being exposed at any one time by the main display.
8. A machine as claimed in any of Claims 4 to 7, further comprising visual and/or audible indicator means which are energised when the said subsidiary control mechanism is enabled.
9. A machine as claimed in Claim 6, in which the said means for illuminating the said display fields of the subsidiary display comprise a plurality of electrical contacts each linked with a corresponding bulb or other illuminable device, and a wiper contact carried by the associated reel so as to engage each of the said electrical contacts in sequence thereby completing in sequence respective circuits to the bulbs or other illuminable devices of the display fields.
10. A machine as claimed in any preceding Claim, in which there are further provided at least one control switch for selectively terminating sequencing of the symbols of an associated group.
11. A machine as claimed in Claim 10, in which there are provided means for selectively enabling the said control switch in a random or pseudo random manner and for indicating visually or audibly that the switch is enabled.
12. A machine as claimed in Claim 11, in which there are provided such control switches for each of the groups of symbols.
13. A machine for playing a game of chance, substantially as hereinbefore described, with reference to, and as shown in, the accompanying drawings.
GB3893776A 1976-09-20 1976-09-20 Machines for playing a game of chance Expired GB1568522A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050419A1 (en) * 1980-09-30 1982-04-28 Bally Manufacturing Corporation Gaming apparatus
GB2117155A (en) * 1982-02-25 1983-10-05 Arthur Edward Thomas Gaming machine
GB2135490A (en) * 1983-02-19 1984-08-30 Jpm Gaming or amusement-with-prizes machines
GB2183381A (en) * 1984-12-08 1987-06-03 Elton Fabrications Machines for use in amusement and/or gaming
DE3718417A1 (en) * 1987-06-02 1988-12-22 Gauselmann Paul Gaming machine with a device for displaying the sequence of symbols arranged on the rotating members of a symbolic playing Device
GB2242300A (en) * 1990-03-24 1991-09-25 Bell Fruit Mfg Co Ltd Gaming and amusement machines.
EP0464935A1 (en) * 1990-06-29 1992-01-08 Rouvoet Electronics B.V. Gaming device
GB2384356A (en) * 2001-12-21 2003-07-23 Project Leisure Ltd Gaming apparatus
US7950994B2 (en) 2004-09-10 2011-05-31 Igt Replacement reel gaming device and method
US9659463B2 (en) 2014-04-16 2017-05-23 Bally Gaming, Inc. Wagering game with reel-swap feature
US10147281B2 (en) 2014-07-24 2018-12-04 Igt Gaming system and method having matching symbol stacks and additional award opportunities

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050419A1 (en) * 1980-09-30 1982-04-28 Bally Manufacturing Corporation Gaming apparatus
GB2117155A (en) * 1982-02-25 1983-10-05 Arthur Edward Thomas Gaming machine
GB2135490A (en) * 1983-02-19 1984-08-30 Jpm Gaming or amusement-with-prizes machines
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US10026256B2 (en) 2004-09-10 2018-07-17 Igt Replacement reel gaming device and method
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