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WO2012066318A1 - Dispositif de freinage et procédé de freinage - Google Patents

Dispositif de freinage et procédé de freinage Download PDF

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Publication number
WO2012066318A1
WO2012066318A1 PCT/GB2011/052221 GB2011052221W WO2012066318A1 WO 2012066318 A1 WO2012066318 A1 WO 2012066318A1 GB 2011052221 W GB2011052221 W GB 2011052221W WO 2012066318 A1 WO2012066318 A1 WO 2012066318A1
Authority
WO
WIPO (PCT)
Prior art keywords
wheel
braking device
trolley
ground
braking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB2011/052221
Other languages
English (en)
Inventor
Andrew Peter Parkinson Gray
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gray Matter Alpha Ltd
Original Assignee
Gray Matter Alpha Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gray Matter Alpha Ltd filed Critical Gray Matter Alpha Ltd
Priority to EP11805133.3A priority Critical patent/EP2640614A1/fr
Priority to AU2011330893A priority patent/AU2011330893A1/en
Publication of WO2012066318A1 publication Critical patent/WO2012066318A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B33/00—Castors in general; Anti-clogging castors
    • B60B33/0028—Construction of wheels; methods of assembling on axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/12—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting otherwise than by retarding wheels, e.g. jet action
    • B60T1/14—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting otherwise than by retarding wheels, e.g. jet action directly on road
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00—Brake-action initiating means
    • B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
    • B60T7/16—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger operated by remote control, i.e. initiating means not mounted on vehicle
    • B60T7/18—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger operated by remote control, i.e. initiating means not mounted on vehicle operated by wayside apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B62B5/04—Braking mechanisms; Locking devices against movement

Definitions

  • the present invention relates to braking devices, and is concerned particularly, although not exclusively, with braking devices for use with hand-pushed vehicles, such as shopping trolleys or carts.
  • All trolley retention systems are designed to allow the trolley to be legitimately used within the permitted area but to cause the trolley to stop when, a pre-detersiined perimeter line is crossed.
  • this many previously considered systems have sought to cause a wheel or castor, or some part of the vehicle, to detect a change, in environment and to respond appropriately by inhibiting further motion of the trolley.
  • Some prior systems have attempted to do this by employing permanent, magnets which are set into the ground and are arranged to trigger a braking system.
  • Others have used electronic systems wherein coded instructions are relayed by radio or infra-red as a trigger signal to a receptor on the trolley. All of these prior systems are expensive.
  • the magnets are costly to install, and in the case of the electronic system the electronic devices required are costly to manufacture, and they require batteries and other valuable components.
  • the electronics-based systems have been known to be unreliable, due to difficulties in regulating the trigger signal in the vicinity of large metallic objects such as railings,
  • Another type of previously considered system utilises a small jockey wheel which is arranged to run alongside one of the trolley wheels and to drop into a groove at a boundary location to trigger a braking mechanism.
  • This prior system has the disadvantage that minor undulations in the ground can cause the brake to trigger needlessly, resulting in inconvenience to a user using the trolley legitimately.
  • US patent number 3, 892,295 describes a bo-undary-responsive wheel lock for a shopping cart or the like, in which a brake is. made to lock a wheel of the cart when a small actuating wheel falls below the . level of the wheel of the, cart,, tor example by dropping into a groove in the ground.
  • European, patent number EP 0 740 624 B1 describes a security device for preventing removal of a shopping cart from premises.
  • a brake trigger engages with a stop member located oh the ground surface at an exit region of the premises, to activate a brake and halt the progress of the cart.
  • Our own published PCX application WO 2009/063237 describes a braking arrangement for a shopping cart in which a braking arm moves to brake a wheel of the cart when a smaller wheel loses contact with the ground, such as happens when the cart is being lifted.
  • embodiments of the present, invention aim to provide a brake or lock mechanism for a wheel, castor, truckle or similar in which the abovementioned problems are at least partly overcome.
  • retention apparatus for preventing the unauthorised removal of. a trolley, cart, barrow or similar, from a designated area
  • the apparatus comprising a braking device arranged to. act upon a wheel of the trolley when triggered, and at least one ground fixture fixed to a ground surface at a designated region of the said area, wherein, the ground fixture comprises a surface profile which is so configured as to trigger the braking device when an attempt is made to pass the trolley over the ground fixture.
  • the ground fixture may comprise a trigger tile having a specific trigger profile.
  • the specific trigger profile comprises a plurality of studs. The height of the studs may be selected tp trigger the braking device.
  • a braking device for a vehicle wheel, such as a trolley wheel, arranged in use to travel on a ground surface.
  • the device comprising a braking member arranged to act upon the vehicle wheel when triggered, and a surface follower arranged to bear against the ground surface, wherein the braking member Is arranged to be triggered by displacement of the surface follower when the surface follower encounters a portion of the ground surface having a specific triggering profile .
  • a braking device for a vehicle wheel such as- a trolley wheel, arranged in use to travel on a ground surface
  • the device comprising a braking member arranged, to act upon the vehicle wheel when triggered, and a surface follower arranged to bear against the ground surface, wherein the braking member is arranged to be triggered by displacement of the surface follower when the surface follower becomes displaced beyond a predetermined extent.
  • the surface follower is mounted, on the braking device for sliding movement relative thereto.
  • the surface follower is mounted on the braking device for pivotal movement relative thereto.
  • the surface follower may be biased into contact with the ground surface.
  • the surface follower comprises a jockey wheel.
  • The. surface follower may be arranged to monitor the ground surface.
  • the braking member ' may be mounted on the braking device for pivotal movement relative to the wheel, so as to come between the wheel and a ground surface when triggered.
  • the braking member is arranged to pivot eccentrically with respect to the. rotation of the wheal .
  • the braking device comprises a reset aperture arranged in use to receive a reset member for resetting the device.
  • the braking device preferably includes, reset gate means, arranged to be opened by the reset member prior to resetting.
  • the reset gate member may be arranged to be actuated magnetically. Preferably resetting is prevented in the absence of a reset member.
  • the braking member may be arranged to be triggered when the vehicle is tilted and/or when it is lifted.
  • a method of retaining a trolley in a designated area comprising installing a ground fixture at a designated place in the area, which ground fixture has a surface profile so configured as to. trigger a braking device on the trolley when an attempt is made to pass, the trolley over the ground fixture.
  • the invention also includes a wheel comprising a braking device according to any statement herein.
  • the invention also includes a trolley comprising a wheel according to any stacement herein .
  • the invention also provides a ground tile for fixing to a ground surface as part of a trolley retention system for arresting movement of a trolley, the. cile having a specific triggering, profile arranged in use to trigger a braking device of a trolley wheel or pastor when the wheel or castor is caused to travel over the tile.
  • the ground tile preferably comprises a plurality of protrusions or studs, at least one of which is arranged to engage with the braking device when a surface follower of the braking device falls between the studs as ' the trolley wheel or castor is rolled over the tile.
  • the ground tile comprises at least one weight-bearing portion for supporting the weight of a vehicle so as to resist wear on the protrusions.
  • Figure 1 is a side view of a trolley wheel together with a braking device, according to an embodiment of the present invention
  • Figure 2 shows the wheel and braking device in front view
  • Figure 3 shows the braking device of Figures 1 and 2 in a first inoperative configuration
  • Figure 4 shows an internal face of a case lid of the brake device of Figures 1. to 3;
  • Figure 5 shows a trigger surface in the form of a tile, for use with the braking device of Figures 1-4;
  • Figure 6 is a similar view to that of Figure 3, but with the braking device encountering a triggering, stud;
  • Figure 7 shows the braking device in another configuration
  • Figure 8 shows the braking device in an operative
  • Figure 9 shows the device from an alternative view
  • Figure 10 shows a. retaining pin of Figurs 9 being moved into a triggered position by a stud on the tile;
  • Figure 11 shows a stud of the device being moved into a triggered position as a result of the braking device being lifted from the running surface;
  • Figure 12 shows internal parts of a ski member ⁇ not itself shown) of the device that, prevents the trolley being taken over the studs at an angle;
  • Figure 13 is another view of the brake assembly and the rear of the case
  • Figure 14 shows a reset strip about to be inserted
  • Figure IS shows the reset, strip of Figure 14 being
  • Figure 16 shows the reset strip resetting the braking device
  • Figure 17 shows a non-return ratchet, mechanism of the brake device
  • FIGS IS to 20 show an alternative embodiment of trigger mechanism; figures 21 to 23 show another embodiment of trigger
  • Figure 24 is an enlarged view of a retaining pin of the embodiment of Figures 21-23; and Figure 25 is a partial view of an alternative embodiment in which a different type of biasing Spring is utilised,
  • FIGS. 1 and 2 show, respectively side and front views of a braking device according to an. embodiment of the present invention.
  • a trolley wheel assembly is shdwn generally at 10 and includes a fork 10a, a fixing bolt and nut 10b, and a bearing housing 10c.
  • the wheel itself is shown at 12 and is of the castor type. commonly used in shopping trolleys. In this example the wheel is of a particular design for use with a travelator, or moving roadway, but it could be of any other troiiey wheal design.
  • a braking device shown generally at 14, comprises a pivoting brake arm 14a, end a wedge-shaped brake pad 14b, located at a distal end of the brake arm 14a, and arranged in use to come between the Wheel and a running surface 16 on which the trolley runs in use when actuated.
  • the braking device is housed in a case 15.
  • a forward direction of travel is indicated by Arrow A,
  • the braking device 14 is located, between the forks of the wheel 12, but in an alternative arrangement it could be located on the outside of the forks. In another, alternative embodiment, the braking device 14 could be positioned between a pair of wheels.
  • a jockey wheel 18 is mounted so es to run on the running ground surface 16 alongside the trolley wheel 12, The jockey wheel follows the surface 16 and effectively monitors it.
  • a ski member 20 In front of the jockey wheel 18 is a ski member 20, the purpose of which is to assist the jockey wheel's progress over small obstacles, such as stones, without inadvertently triggering the braking device, as will be described further below.
  • the jockey wheel 18 is resiliently mounted in a sliding carriage (not shown in. Figures 1 and 2 ⁇ and is biased to bear against the running surface 16 in normal use.
  • Behind the jockey wheel 18 is a trigger arm 22 which is used to trigger the braking device as will foe described in. more detail below,
  • A. rubber pad 24 is mounted on the case alongside the jockey wheel and provides additional support tq the caster when the wheel engages with a travelator.
  • FIG 3 shows the braking device 15 revealing the internal parts.
  • the braking device is made with a main case body 15a and. a lid 1.5b.
  • the lid 15b of the case 15 has been removed.
  • the trolley wheel 12 has itself been Omitted from this drawing in the interests of clarity.
  • A. sliding carriage 26 retains the jockey wheel 18 and the trigger arm 22, and a biasing spring 28 presses the jockey wheel onto the running surface 16, so that the jockey wheel monitors the surface over which the trolley wheel runs at all times. If the profile of the running surface .1.6 allows, the jockey wheel and sliding carriage will move downwards under the influence of the biasing, spring 28.
  • a braking device retaining pin 30 controls the actuation of the braking device, as will be described below.
  • a damper 32. slows the final stages of the sliding motion of the carriage 26 towards maximum extension.
  • a slot 15c placed at the top of the case 15 permits access for an operative seeking to reset the braking device, as will be described below.
  • the trigger arm 22 In order to trigger the braking device, the trigger arm 22 must foe forced to rotate around location point 22a so that trigger face 22b is moved agaiftst the braking device retaining pin 30 in order to move it from a first position, in which actuation of the braking device is prevented, to a second position, in which actuation of the braking device is permitted. In order to prevent false!
  • Trigger arm 22 is biased towards a non-triggered position by leaf spring 22d.
  • The. jockey wheel is free to rotate on a spindle on the ski member 20 and it is in permanent contact with the running surface ⁇ not shown in this figure ⁇ .
  • Studs which are designed to trigger the braking device, are all at the same height, for example 9mm, and are spaced in such a way as to allow the jockey wheel to travel between adjacent studs but not the trolley wheel.
  • a trigger arm locating pin 22e prevents rotation of the trigger arm 22. and thereby prevents release of the pin 30 unless the sliding member 26 has extended to a predetermined degree out of the case 15, In this way two conditions need to be met before the device can be triggered - firstly the jockey wheel 13 needs to be a predetermined distance below the running surface, and secondly a triggering stud or
  • the device has two . distinct ways of rejecting other bumps and ridges that might be found on the running surface and only triggers on specially provided studs which are set for example at exit points determined by the owners of the vehicle.
  • Figure 4 shows the interior of the lid 15b of the case 15, A compression spring 30a (not shown, in this drawing) presses against the interior of the lid 15b biasing the retaining pin 30 in a non-actuating position.
  • a pivoting blocking member 32a which is? arranged to pivot about an axis which is substantially perpendicular to the direction of travel of the sliding carriage 26, and is also substantially perpendicular to the axis about which the jockey wheel 18 rotates (i.e. in the plane of the page, as Figure 4 is viewed) .
  • the blocking member In normal operation, when the sliding carriage is not extended, the blocking member is biased by spring 32b against the side of the ski member 20, as shown in Figure 3, with the spring 32b in extension, However, when the sliding carriage 26 extends beyond a threshold point, after which the ski member is no longer positioned beneath the pivoting blocking member 32a, the blocking member, under the influence of spring 32b, moves into the path of the damper 32 and acts to provide a stop for the damper 32 so that, when, the trolley wheel is lifted away from the running surface, the sliding carriage 26, biased by spring 28 . to extend out of the case IS* is prevented from escaping by the blocking member 32a, which acts upon the damper 32. In the final 10mm or so of movement the tip of the damper 32 abuts against the blocking member 32a which slows, the last movement of the sliding carriage.
  • Figure 4 also shows a recess 15d and a raised surface ,15e. This is created so that when the sliding carriage 26 has extended out of the housing by the pre-deterroined height, i.e. when the jockey wheel IS ' is running between the studs and the. main wheel 12 is running over the top of the studs, the recess will accept the trigger arm locating pin 22e. If the sliding member, is not at the right height to use the recess then, no ether bumps can trigger the mechanism as trigger member 22 is prevented from rotation by arm 22e abutting against raised surface 15e.
  • Figure 5 shows generally at 36 a trigger tile for. use with a trolley having a braking device as described above, and together with the braking device forming a trolley
  • the tile is substantially rectangular and is made of moulded nylon or similar material.
  • the tile 36 has an upper surface on. which are a number of moulded protrusions or studs 38 which are arranged in a pattern of rows at generally 45 degrees to a direction of travel of the trolley, as
  • the studs are aligned in this way, and are spaced apart, in such a way,, as to allow the trolley wheels to pass over the studs.
  • the ski member 20 and jockey wheel 18 drop between the studs to a lower surface 40 and when the ski member encounters a stud it becomes urged upwards before falling back down over the stud which then becomes located in a gap between the ski member 20 and the jockey wheel 18. Further forward movement of the trolley at this point causes the stud to push against the trigger arm 22, triggering actuation of the braking device.
  • the tile also includes weight-bearing portions or platforms 42, for supporting the weight of a vehicle and avoiding needless wear on the studs, ramps 44 to allow smooth access over the tile and.
  • A. heavy duty version of the tile includes metal reinforcements in the platforms 42,
  • Figure 6 shows the braking ' device encountering a stud while parsing over the tile of Figure 5.
  • the trolley wheel is omitted from this diagram, but would be resting on top of the studs, while the jockey wheel 19 and ski member 2.0 have dropped between the studs under the bias of the spring 28.
  • The. ski member 20 has slid over a stud 38 and the Stud has become located between the ski member and the trigger arm 22, Further forward motion of the trolley causes the trigger arm 22 to push against the trapped stud 38, causing the trigger arm 22. to pi.vpt, which in turn causes trigger face 22b to push against the retaining pin 30.
  • the trolley wheel is omitted from this diagram, but would be resting on top of the studs, while the jockey wheel 19 and ski member 2.0 have dropped between the studs under the bias of the spring 28.
  • The. ski member 20 has slid over a stud 38 and the Stud has become located between the ski member and the trigger arm 22, Further forward motion of the trolley causes the trigger arm 22 to
  • retaining pin 30 is resiliently biased in a non-actuating position by the biasing spring 30a, and the force of the trigger face 22b against the pin 30 ' overcomes the bias of spring 30a to displace the pin 30 which allows the brake to activate.
  • the trigger arm locating pin 22e is permitted movement as it can drop into recess 15d within lid 15b.
  • a leg 26b that extends from the sliding carriage 26 so that it also lifts the retaining pin 30 when the sliding carriage is fully extended.
  • Figure 7 shows the sliding carriage 26 at a height which would be required, if the trolley wheel (not shown) was on a travelater or the jockey wheel 18 (but not the trolley
  • the action of the spring .2.8 to bias the sliding carriage 26 to fully extend out of the case 15 is delayed by the damper 32, so that a momentary absence of the running surface does not cause the braking device to trigger.
  • This enables, for example, the shopping trolley to be pushed off a kerb without triggering as this, would only leave the wheel off the ground for a fraction of one second, However if the wheel were to be lifted for a longer period then the braking systera would need to come into operation, otherwise the trolley could be lifted over the tile and stolen,
  • the damper 32 is a email oil-filled unit of the. type often used to soften the closure of drawers in domestic storage units.
  • Figure 8 shows the braking device when the trolley wheel 12 has been lifted away from the running surface 16.
  • the sliding carriage 26 has been urged by spring 28 to fully extend out of the case 15.
  • the damper 32 has been fully compressed, by blocking member 32a and the trigger face 22b has pushed the retaining pin 30 into a release position.
  • the braking arm 14a has pivoted into a braked position as shown in the figure under the influence of a biasing spiring, as will be described below.
  • the brake pad 14fo has become located between the trolley wheel (not shown) and the. running surface, thereby preventing further movement of the wheel and therefore the trolley itself.
  • Figure 9 shows' a. view of pin .30, brake 14 and sliding carriage 2.6 without the case, In this view, pin 30 being biased by spring 3.0a, prevents the brake 14 from rotational movement by positively locating in a slot 14f. Also shown is a lifting face 30c on pin 30.
  • Figure 10 shows the retaining pin 30 being moved away from its brake retaining position by trigger face 22b after the trigger arm 22 has been rotated by a triggering stud (not shown) .
  • Trigger face 22b is also set at 45 degrees to the required movement of pin 30 so that as trigger arm 22 is moved by the stud it can lift the pin 30 as the two faces coding together cause the pin to move laterally and release the brake 14.
  • Figure 11 shows the retaining pin 30 being moved away from its brake retaining position by a leg 26b on the sliding carriage 26 as. the trolley wheel ⁇ not shown ⁇ has been lifted, away froro the running surface.
  • leg 26b also has a face which is. set at 45 degrees to the direction of the movement of pin 30. As it slides past, the leg 26b bears against an angled portion 30b of the pin 30 and compresses the spring 30a .
  • ski trigger member 20a within the ski member 20.
  • Figure 12 shows a cutaway section of the ski member 20 to reveal the ski trigger member 20a which has a front face portion. 2Ob that is flush with the front edge of the ski member 20, and a rear rod portion 20c. 'When a user lifts the back of the trolley, the new angle ensures that the stud contacts the front face portion 20b and moves the ski trigger member 20a backwards causing the rear rod. portion 20c to push the trigger arm 2.2 in the same way as a stud would do. In this way, when s user pushes the trolley over a trigger tils, triggering of the braking device cannot be avoided by tilting the trolley.
  • Figure 13 shows the braking device and the exterior side of the case body 15a.
  • the braking arm 14a is located on spindle: 14c by means of. an aperture which is off-centre to the rotation point for wheel 12 .
  • the braking device 14 is held in its free running position by retaining pin 30 which is located in slot 14f . It is important that the braking device does not move away from case 15 and that pin 30 does not lose contact with slot 14f as this would permit the device to trigger falsely.
  • Figure 14 and Figure 15 show a resetting system for the braking device.
  • a reset strip 52 is provided for insertion into slot 15c of. the case 15.
  • the strip 52 is preferably connected to a longer rod 54 so that an operative n «ed not bend to reset the device. Since the wheel 12 bearing the braking device 14 is always fined to the cart there is provided, advantageously, an angle or bend 52a in the strip 52 at the point of connection to the rod 54. The presence of the bend also prevents the user from inserting the strip 52 the wrong way round, as in such an event the rod S3 would clash with the body of the trolley, In order to provide security against any strip of the same approximate proportions from being able to reset the device, a first magnet 56 is fitted into the strip 52.
  • the first magnet 56 operates a latch 5$ by repelling a second magnet 60 in the latch 58. If the first magnet. 56 in the reset strip 52 offers a north-pole field to face the latching mechanism 58, the. second magnet 60 therein must be oriented with a north-pole field facing the reset strip 52.
  • the repelling force of the two magnets biases the latching mechanism to rotate from a first, closed position to a second, open position of the latch as it rotates around a post 62,
  • a biasing means 64 which keeps the latching mechanism 58 closed when there is no resetting magnet 56 present. This could take the form of a email spring., but in the embodiment illustrated there is another small magnet 64 which is there to repel the magnet 60 in the latching mechanism to cause it to stay in. its closed position.
  • the latching mechanism 58 has ridge 58a which ordinarily prevents an entry gate 66 from movement, but when it is moved by the influence of the first magnet 56 it moves out of engagement and permits the entry gate 66 to move from a first, closed position to a second, open position.
  • Gate 66 has two legs; a first 66a covers the aperture slot 15c for the reset strip 52 and a second leg 66b is biased by a spring 68 to remain in its closed position. The gate 66 is allowed to move from its first to second position rotating around its post 66c.
  • Figure 16 shows the reset strip 52 further inserted so that it is acting upon a. ratchet lever 70 which has a contact face 70a and blocking tip 70b.
  • the lever 70 rotates from a first, blocking position to a second, release position around post 70c. It is biased towards the blocking position by spring 70d.
  • strip 52 comes into contact with face 70a and rotates the ratchet lever 70 so that the tip 70b no longer blocks the return of the braking assembly to its free running position.
  • the reset strip 52 comes into contact at point 14g with the brake assembly 14. causing it to return to its free running position, When it is in. its free running position it is retained there by pin 30.
  • Figure 17 shows in more detail part of the resetting mechanism, with some parts removed for clarity. The
  • blocking tip 70b may be seen: restricting braking device. 14 from moving (anticlockwise) in. a resetting. Only when reset strip 52 overcomes the bias of spring member 70d is the brake member 14 permitted to rotate fully to its free running position. A limited degree of rotation in the resetting direction is permitted so that, the braking pad 14b is just resting on the ground and is not fully under the wheel 12. If this were not the case it would be very difficult for the reset strip 52 to bring the brake from under the weight of the trolley to a free running position.
  • Figures 18 - 20 show a variation on the brake blocking and release system *
  • the pin 30 is moved, by trigger face 22b or slider leg 26b, both of which require the interaction of sliding faces, which are arranged at a 45 degree angle, to move the pin 30 from its .blocking position to its released position.
  • trigger face 22b or slider leg 26b both of which require the interaction of sliding faces, which are arranged at a 45 degree angle, to move the pin 30 from its .blocking position to its released position.
  • The. pin . 230 has a further leg 250 which in its first ana blocking position holds the brake from rotating, When the pin 230 is rotated by either 222b or 226b the leg 2S0 is released to rotate into its braking position.
  • Figures 21 to 23 show an alternative embodiment which is similar to that of Figures 18-20 in that a rotating retaining pin is utilised, in this case labelled as 330.
  • the release pin 330 is made of two parts: an upper part 330u, which is arranged to come into contact with the trigger member 22, and a lower part 3301 which is arranged to block and release brake, member 14.
  • the pin is biased towards a blocking position by spring 330a, which in this case is a tension spring.
  • spring 330a which in this case is a tension spring.
  • spring 330s is provided.
  • Figure 23 shows groove 14v which holds bottom part 3301 in the correct place after it has triggered and released the brake. Once the reset stick has rotated the brake arm clockwise the finger on 3301 can, under the bias Of spring 330a rotate back into a blocking position.
  • Fig 24 shows the trigger pin 330 in its two parts 330u and 3301. These parts are positively located by means of a shaped male part 330g shown hers as a triangular rod and in part 330u there is a receiving female part 330h. Also shown is retaining pin 330z which holds the spring 330a.
  • Figure 25 shows an alternative embodiment .in Which the biasing spring for the .sliding carriage 26 is a constant force spring 328.
  • a characteristic of a tension spring is that the force exerted increases the greater it is extended.
  • the present invention provides an improved, vehicle braking assembly for a wheel of a vehicle such as a supermarket trolley, the assembly including a case, a brake which is arranged to come between a wheel of the trolley and the running surface, a second, jockey wheel arranged to remain in permanent contact with the ground, a trigger system arranged, to operate the braking system
  • a brake which is arranged to come between a wheel of the trolley and the running surface
  • a second, jockey wheel arranged to remain in permanent contact with the ground
  • a trigger system arranged, to operate the braking system
  • Embodiments of the present invention include developments in which the brake will also be released if the wheel is pushed over a running surface with, a particular profile.
  • the triggering surface element can. be easily installed and as it will be obvious that it is intended to halt the progress of the vehicle beyond an authorised area, a second triggering system will operate the sane brake if the user attempts to lift: the wheel over the triggering surface. In this way the braking system will operate if the trolley is rolled. over the triggering surface or else if it is lifted over this or any other obstacle which may mark the
  • the braking device will be triggered mechanically when pushed over a plate which can be mounted on the any pedestrian or roadway or it will trigger if lifted over this or any other fence or similar deterrent .
  • the braking device may be fitted alongside a conventional castor or wheel and fixed so that it cannot rotate or move in relation, to the castor. It may be made to locate between two wheels located within e.g. the yoke of a castor, or it may sit alongside the wheel. It could be made to fit on the outside of the fork of the castor or on the inside,
  • the most effective braking method is to release a braking member which, is held in front of the wheel during free running but which is permitted to rotate to a position, between the wheel and the ground during braking.
  • the dsvi.ce is intended to respond to a certain pattern of studs or an undulating surface of specific proportions so that it triggers on this surface bat on no others,
  • the trigger means is located alongside a monitor Wheel, referred tq herein as a jockey wheel, which is not used to support the weight of the vehicle.
  • This smaller wheel is biased to remain in .contact with the running surface by a biasing means such as a spring.
  • a biasing means such as a spring.
  • both the small wheel and the associated trigger means are located on an arm that either rotates/pivots, or, as in the embodiment described above, slides laterally. Being smaller in diameter the jockey wheel may drop .into a groove or gulley in the running surface. It may also drop into a channel between the studs on the special triggering
  • the triggering member is protected from being inadvertently contacted and moved for example by a small stone or uneven ground, as it is located behind a ski portion which forms part of the arm that supports the jockey wheel. Accordingly the trigger arm will only be moved when it is extended a specific distance put of the case and when it is pushed bver one of the studs, which are spaced and shaped to locate between the ski portion and one end of the trigger member. When a stud is located in this position, any further forward movement, of the wheel ensures that the trigger member is moved by the stud. This in turn moves a retaining pin which releases the brake member to rotate from a position where it is
  • the braking member moves generally around the same centre of rotation as the wheel, However in order to ensure that there is no contact with the wheel during, free running yet the brake does slide easily between the wheel and the ground, the brake member has a slightly different centre of rotation so that there is a cam effect and the brake moves closer to the wheel as it rotates from its free running position to its braking position.
  • a further advantage of the present invention Is the easy resetting system. Tor resetting, to enable free movement of the trolley, other devices require a key and for the operator to bend to reset the brake into a free running position, or else they require expensive electronic
  • Embodiments of. the present invention provide a slot into which a resetting strip of material can be inserted, the strip can be
  • a still further advantage of this embodiment is that it- contains a biasing means for the member that retains the jockey wheel and triggering system.
  • the member which retains the jockey wheel and the triggering means is able to slide laterally in a generally up and down direction so that the jockey wheel can remain in contact with the ground. The amount of movement, given to the sliding member allows the jockey wheel to be fully retained within the case or to protrude beyond the case to allow for the jockey wheel to go over some moderately rough ground and still remain, in contact with the running, surface.
  • biasing means i «ay advantageously take the form of a spring, though other equivalent devices may be used,
  • the trigger tiles need neither special equipment nor specialist knowledge for their installation, and they can be offered in standard sizes in an off-the-shelf package.
  • the ground surface to which they are fixed needs no special preparation beforehand.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Handcart (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Braking Arrangements (AREA)

Abstract

L'invention concerne un appareil de retenue destiné à empêcher un retrait non autorisé d'un chariot d'une zone désignée, cet appareil comprenant : un dispositif de freinage (14) agencé pour agir sur une roue (12) ou une roulette du chariot lorsqu'il est déclenché, et au moins un dispositif fixe au sol fixé à une surface du sol à un emplacement désigné de ladite zone, ce dispositif fixe au sol comprenant un profil de surface configuré pour déclencher le dispositif de freinage lorsque l'on tente de faire passer le chariot sur le dispositif fixe au sol.
PCT/GB2011/052221 2010-11-15 2011-11-15 Dispositif de freinage et procédé de freinage Ceased WO2012066318A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11805133.3A EP2640614A1 (fr) 2010-11-15 2011-11-15 Dispositif de freinage et procédé de freinage
AU2011330893A AU2011330893A1 (en) 2010-11-15 2011-11-15 Braking device and method for braking

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1019232.6 2010-11-15
GBGB1019232.6A GB201019232D0 (en) 2010-11-15 2010-11-15 Braking device

Publications (1)

Publication Number Publication Date
WO2012066318A1 true WO2012066318A1 (fr) 2012-05-24

Family

ID=43431415

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2011/052221 Ceased WO2012066318A1 (fr) 2010-11-15 2011-11-15 Dispositif de freinage et procédé de freinage

Country Status (4)

Country Link
EP (1) EP2640614A1 (fr)
AU (1) AU2011330893A1 (fr)
GB (2) GB201019232D0 (fr)
WO (1) WO2012066318A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3265157A (en) * 1964-08-06 1966-08-09 Westinghouse Electric Corp Floor structures for storage distribution areas
US3892295A (en) * 1974-04-24 1975-07-01 Charles Hahto Boundary-responsive wheel lock for a wheeled vehicle
EP0381311A1 (fr) * 1989-01-09 1990-08-08 Trolley Services Limited Installation de sécurité pour chariots
EP0740624B1 (fr) * 1994-01-26 1999-10-20 Kart Security Limited Dispositif de securite
WO2009063237A1 (fr) * 2007-11-12 2009-05-22 Gray Matter (Alpha) Limited Dispositifs et procédés de freinage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3265157A (en) * 1964-08-06 1966-08-09 Westinghouse Electric Corp Floor structures for storage distribution areas
US3892295A (en) * 1974-04-24 1975-07-01 Charles Hahto Boundary-responsive wheel lock for a wheeled vehicle
EP0381311A1 (fr) * 1989-01-09 1990-08-08 Trolley Services Limited Installation de sécurité pour chariots
EP0740624B1 (fr) * 1994-01-26 1999-10-20 Kart Security Limited Dispositif de securite
WO2009063237A1 (fr) * 2007-11-12 2009-05-22 Gray Matter (Alpha) Limited Dispositifs et procédés de freinage

Also Published As

Publication number Publication date
EP2640614A1 (fr) 2013-09-25
GB2485485A (en) 2012-05-16
AU2011330893A1 (en) 2013-04-04
GB2485485B (en) 2013-06-12
GB201019232D0 (en) 2010-12-29
GB201119656D0 (en) 2011-12-28

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