Magnetic braking and spring retraction assembly

A magnetic braking and spring retraction assembly comprises a spool, a one way bearing, a leash, a rod, a planetary carrier, a plurality of planetary gears, a sun gear, a ring gear, a magnetic disc, and an enclosure. An end of the leash is attached to the spool and wraps around the spool. The magnetic braking and spring retraction assembly operates in one of two modes that include a magnetic braking mode and a spring retracting mode. In the magnetic braking mode, the spool rotates in a first direction thereby causing the leash to extend away from the assembly. In the spring retracting mode, the spool rotates in a second direction and the leash is drawn towards the assembly. In one of the magnetic braking and spring retracting modes the one way bearing locks and in another of the magnetic braking and spring retracting modes the one way bearing freewheels.

TECHNICAL FIELD

The present invention relates generally to pet leashes, and more particularly to retractable leash assemblies.

BACKGROUND INFORMATION

A retractable leash device is a common type of leash utilized by pet owners to walk their canines. The retractable leash device typically includes a housing or enclosure with a handle and a leash wound around an internal spool. As the spool rotates in one direction, the leash unravels from the spool and extends away from the spool. As the spool rotates in an opposite direction, the spool is tensioned causing the leash to retract back into the device and wrap around the spool. The retractable leash device tends to minimize slack between the owner and pet thereby preventing extra slack getting caught on objects, getting tangled, or causing other pets or individuals to trip over the extra slack.

SUMMARY

A magnetic braking and spring retraction assembly comprises a spool, a one way bearing, a leash, a rod, a planetary carrier, a plurality of planetary gears, a sun gear, a ring gear, a metal disc, a magnetic disc, and an enclosure. The leash is attached to and wraps around the spool. The magnetic braking and spring retraction assembly operates in one of two modes that include a magnetic braking mode and a spring retracting mode. In the magnetic braking mode, the spool rotates in a first direction (clockwise or counter-clockwise) thereby causing the leash to extend away from the assembly. In the spring retracting mode, the spool rotates in a second direction (counter-clockwise or clockwise) and the leash is drawn towards the assembly. In one of the magnetic braking and spring retracting modes the one way bearing locks, and in another of the magnetic braking and spring retracting modes the one way bearing freewheels.

In one embodiment, the magnetic braking and spring retraction assembly is provided to a user having a pet canine. An end of the leash is attached to the spool and another end of the leash is attached to the canine's collar. When the canine moves away from the magnetic braking and spring retraction assembly, the leash unravels from the spool and extends away and out of the assembly. Rotation of the spool causes the magnetic braking mode to be engaged. During the magnetic braking mode the leash is gradually tensioned. As the canine accelerates, the leash is withdrawn more rapidly causing the spool to rotate at a higher rate. The magnetic braking mode applies greater tension on the spool as the spool rotates at this higher rate. This causes the canine to experience greater tension as the canine travels away from the assembly, and even greater tension if the canine is traveling away from the assembly at a faster rate.

When the canine stops moving away from the magnetic braking and spring retraction assembly or moves toward the assembly, the spring retraction mode is enabled. In the spring retraction mode, the spool is tensioned to rotate in a direction opposite the direction in the magnetic braking mode. During the spring retraction mode, the leash is drawn towards the spool causing the leash to wrap around the spool. This causes slack to be minimized or removed between the user and the canine.

Further details and embodiments and methods are described in the detailed description below. This summary does not purport to define the invention. The invention is defined by the claims.

DETAILED DESCRIPTION

In the description and claims, terms such as “Clockwise (CW)”, “Counterclockwise (CCW)”, “top”, “bottom”, “front”, “back”, and “side” are used to describe relative directions and orientations between different parts of the magnetic braking and spring retraction assembly, and it is to be understood that the overall structure being described can actually be oriented in any way in three-dimensional space. For example, when a first object is described as rotating counterclockwise, it is to be understood that the first object may in fact be rotating clockwise when viewed from a different perspective.

FIG.1is a cross-sectional diagram of a magnetic braking and spring retraction assembly10. In this embodiment, assembly10includes an enclosure11, a leash12attached to a spool13with a retractable spring22, a planetary carrier14coupled to planetary gears15, a ring gear16, a sun gear17, a magnetic disc21including magnets18, a metal disc19, and a support rod20. In this embodiment, ends of support rod20are coupled to the enclosure11via washers (seeFIGS.5-7). Coupling the support rod20to the enclosure11prevents the support rod20from moving laterally while still allowing the support rod20to rotate radially. The addition of washers reduces damage caused to the enclosure11due to the rotating support rod20.

In another embodiment, ends of the support rod20are coupled to the enclosure11such that the support rod20does not move or rotate.

In the embodiment shown inFIG.1, the retractable spring22, sun gear17, metal disc19, and magnetic disc21are each coupled to the support rod20via a freewheeling bearing. A freewheeling bearing is a bearing that does not lock when rotating in a clockwise or counterclockwise direction (e.g. nylon washer).

In another example, the metal disc19contains a hole with a diameter slightly larger than an outer diameter of the support rod20and does not require a freewheeling bearing.

In this embodiment, the metal disc19is made from a magnetically attractive material (e.g. aluminum) and is coupled to enclosure11. The metal disc19is static and does not rotate, but allows for radial rotation of the support rod20.

In another embodiment, the magnetic braking and spring retraction assembly10is provided without the metal disc19. In the example without metal disc19, the enclosure11is made of a magnetically attractive material (e.g. aluminum) and can generate eddy currents with the magnetic disc21. An example of an enclosure of a magnetic braking and retraction assembly without a metal disc is described in detailed description for the embodiment inFIG.12.

One novel aspect of a magnetic braking and retraction assembly is its inclusion of a bearing that locks in one direction (one way bearing). A one way bearing locks when rotating in one direction (e.g. counterclockwise) and freewheels when rotating in the opposite direction (e.g. counterclockwise). For example, the embodiment ofFIG.1shows the spool13coupled to the support rod20via a first one way bearing23.FIG.1also shows the planetary carrier14coupled to the support rod20via a second one way bearing24. The first one way bearing23and the second one way bearing24each lock to support rod20when rotating in the counterclockwise direction.

However, a magnetic braking and spring retraction assembly is able to operate with only a single one way bearing. In another embodiment, the magnetic braking and spring retraction assembly10provided includes the first one way bearing23but does not include the second one way bearing24because the planetary carrier14is coupled directly to the support rod20. (SeeFIGS.11and12). In yet another example, a magnetic braking and spring retraction assembly includes the second one way bearing24but does not include the first one way bearing23because the spool13is coupled directly to the support rod20. A more in-depth explanation regarding the operative components of assembly10is described in the detailed description below.

FIG.2is a diagram of the magnetic braking and spring retraction assembly10and a corresponding table500. Table500illustrates one method of operating the assembly10.FIG.2shows that the magnetic disc21is not coupled to the enclosure11. When the magnetic disc21is not coupled to the enclosure11assembly10is operable in a first operating mode and a second operating mode. In the first operating mode, the spool13is operable in a magnetic braking mode. In the second operating mode, the spool13is operable in a spring retracting mode.

When the spool13is operable in the magnetic braking mode, pulling or extending the leash12applies rotational force on the spool13, causing the spool13to rotate in a counterclockwise direction. Additionally, pulling or extending the leash12causes the retractable spring22to compress. In the magnetic braking mode, the first one way bearing23locks to and drives support rod20in a counterclockwise direction. The support rod20rotating in counterclockwise direction causes the second one way bearing24to lock to the support rod20. The second one way bearing24is coupled to and drives the planetary carrier14in a counterclockwise direction.

In another embodiment, the magnetic braking and spring retraction assembly10is provided without the second one way bearing24. In the example without the second one way bearing24, the planetary carrier14is fixed to the support rod20. When the support rod20is rotated in the counterclockwise direction, the planetary carrier14rotates in a counterclockwise direction.

In yet another embodiment, the magnetic braking and spring retraction assembly10is provided without the first one way bearing23. In the example without the first one way bearing23, the spool13is fixed to the support rod20. When the spool13rotates in the counterclockwise direction, the support rod20rotates in a counterclockwise direction.

In the example ofFIG.2, the planetary carrier14is coupled to three equally spaced planetary gears15(planet gears). In the magnetic braking mode the planetary carrier14rotates in a counterclockwise direction, driving the planetary gears15along the ring gear16in a counterclockwise direction. In other words, the planetary gears15revolve in a counterclockwise direction around the sun gear17. The ring gear16is static (no rotational speed) due to being coupled to the enclosure11. The planetary gears15cause the sun gear17to rotate in a counterclockwise direction.

In the example ofFIG.2, the sun gear17is coupled to the magnetic disc21. In the magnetic braking mode, the sun gear17and magnetic disc21rotate in a counterclockwise direction. The static metal disc19exerts a drag force (magnetic braking force) on each of the magnets18moving with the rotating magnetic disc21.

When the spool13is operable in the spring retracting mode, the retractable spring22decompresses and applies rotational force on the spool13. The spool13rotates in a clockwise direction allowing the leash12to retract. In the spring retracting mode, the first one way bearing23freewheels and does not lock to the support rod20. As a result, the support rod20is static and is not driven by the first one way bearing23while the spool13operates in the spring retracting mode. Additionally, the second one way bearing24, planetary carrier14, planetary gears15, ring gear16, sun gear17, metal disc19, and magnetic disc21are each static and not rotating. In other words, the magnetic braking side of the assembly10is disengaged and no magnetic braking force is generated when the leash12is retracting.

FIG.3is an exemplary diagram of the planetary carrier14of assembly10when the spool13is operable in the magnetic braking mode. In other words, the leash12is extending away from the assembly10. In this example, the magnetic disc21is not coupled to the enclosure11. As the spool13rotates in a counterclockwise direction, the first one way bearing23drives the support rod20. The second one way bearing24locks to the support rod20when the support rod20rotates in a counterclockwise direction. The second one way bearing24is coupled to the planetary carrier14. As the planetary carrier14rotates in the counterclockwise direction, the planetary gears15move along the ring gear16in a counterclockwise direction. Although not shown, the planetary gears15drive the sun gear17in a counterclockwise direction. The sun gear17is coupled to the magnetic disc and creates the magnetic braking force as explained inFIG.2.

FIG.4is an exemplary diagram of the planetary carrier14of assembly10in the second operating mode with the spool13operable in the spring retracting mode. As the spool13rotates in a clockwise direction, the first one way bearing23freewheels and does not lock to the support rod20. The support rod20is static and is not being driven by the first one way bearing23. As a result, the second one way bearing24, planetary carrier, planetary gears15, sun gear, and magnetic disc are static (no rotation). In other words, the magnetic braking mode is disengaged, and no magnetic braking occurs.

FIG.5shows an exploded view of the magnetic braking and spring retraction assembly10.FIG.5shows an exemplary way of how the components of assembly10would be assembled. In this example, enclosure11has two portions that are secured together via fasteners.FIG.5also shows that all of the rotating components (e.g. spool13) of the assembly10conveniently fit inside of the enclosure11. The enclosure11provides a stable housing for the moving parts, which reduces the risk of injury in the event of a malfunction. Certain components such as washers25-26and cover27help protect key components from derailing or being damaged. For example, cover27is coupled to the spool13protects retractable spring22.

In one embodiment, components of assembly10are made of metal. For example,FIG.5shows enclosure11, spool13, planetary carrier14, planetary gear15, ring gear16, sun gear17, metal disc19, support rod20, magnetic disc21(with magnets18), retractable spring22, first one way bearing23, second one way bearing24, washers25-26, and cover27all made of metal material. In this example, aluminium is used to fabricate the components, which is relatively inexpensive and provides a more robust assembly10.

FIGS.6and7are perspective exploded views of the magnetic braking and spring retraction assembly10.FIGS.6-7show an exemplary arrangement of the components of assembly10. In this embodiment, the spool13, planetary carrier14, ring gear16, metal disc19, and magnetic disc21are each separate components. Separating the components reduces costs in the event that one of the components requires replacement or repair. Notably, the components can be coupled together such that they securely fit in the enclosure11, reducing the risk of destabilizing during operation.

After the internal components are assembled, portions of the enclosure11are secured together. In this example, the right side ofFIG.6(left side ofFIG.7), shows that one side enclosure11contains an opening for the leash12to be threaded through. In another example, the assembly10includes a different shaped tether (e.g. rope). In this example, the enclosure11is manufactured to accommodate various shaped tethers.

FIG.8is a cross-sectional diagram of another embodiment of a magnetic braking and spring retraction assembly30. In this embodiment, assembly30includes an enclosure31, a leash32attached to a spool33with a retractable spring42, a planetary carrier34coupled to planetary gears35, a ring gear36, a sun gear37, a magnetic disc31including magnets38, a metal disc39, a support rod40, a first one way bearing43, and a second one way bearing44. Assembly30also includes washers coupled to the ends of support rod40and a cover coupled to spool33that are not shown inFIG.8.

In addition, assembly30includes a button48coupled to enclosure31. The button is operable in a first state and a second state. In the first state, button48is not pressed. In the second state, button48is pressed (depressed). The addition of button48allows a user to set an amount of leash32extendable from assembly30.

FIG.9is a diagram of the magnetic braking and spring retraction assembly30and a corresponding table510. Table510illustrates one method of operating the assembly30. When button48is in the first state (not pressed), the magnetic disc41is not coupled to the enclosure31. When the magnetic disc41is not coupled to the enclosure31assembly30is operable in a first operating mode and a second operating mode. In the first operating mode, the spool33is operable in a magnetic braking mode. In the second operating mode, the spool33is operable in a spring retracting mode.

When the spool33is operable in the magnetic braking mode, pulling or extending the leash32applies rotational force on the spool33, causing the spool33to rotate in a counterclockwise direction. Additionally, pulling or extending the leash32causes the retractable spring42to compress. In the magnetic braking mode, the first one way bearing43locks to and drives support rod40in a counterclockwise direction. The support rod40rotating in counterclockwise direction causes the second one way bearing44to lock to the support rod40. The second one way bearing44is coupled to and drives the planetary carrier34in a counterclockwise direction.

In another embodiment, the magnetic braking and spring retraction assembly30is provided without the second one way bearing44. In the example without the second one way bearing44, the planetary carrier34is fixed to the support rod40. When the support rod30is rotated in the counterclockwise direction, the planetary carrier34rotates in a counterclockwise direction.

In yet another embodiment, the magnetic braking and spring retraction assembly30is provided without the first one way bearing43. In the example without the first one way bearing43, the spool33is fixed to the support rod40. When the spool33rotates in the counterclockwise direction, the support rod40rotates in a counterclockwise direction.

In the example ofFIG.9, the planetary carrier34is coupled to three equally spaced planetary gears35(planet gears). In the magnetic braking mode the planetary carrier34rotates in a counterclockwise direction, driving the planetary gears35along the ring gear36in a counterclockwise direction. In other words, the planetary gears35revolve in a counterclockwise direction around the sun gear37. The ring gear36is static (no rotational speed) due to being coupled to the enclosure31. The planetary gears35cause the sun gear37to rotate in a counterclockwise direction.

In the example ofFIG.9, the sun gear37is coupled to the magnetic disc41. In the magnetic braking mode, the sun gear37and magnetic disc41rotate in a counterclockwise direction. The static metal disc39exerts a drag force (magnetic braking force) on each of the magnets38moving with the rotating magnetic disc41.

When the spool33is operable in the spring retracting mode, the retractable spring42decompresses and applies rotational force on the spool33. The spool33rotates in a clockwise direction allowing the leash32to retract. In the spring retracting mode, the first one way bearing43freewheels and does not lock to the support rod40. As a result, the support rod40is static and is not driven by the first one way bearing43while the spool33operates in the spring retracting mode. Additionally, the second one way bearing44, planetary carrier34, planetary gears35, ring gear36, sun gear37, metal disc39, and magnetic disc41are each static and not rotating. In other words, the magnetic braking side of the assembly40is disengaged and no magnetic braking force is generated when the leash32is retracting.

FIG.10is a diagram of the magnetic braking and spring retraction assembly30and a corresponding table520. Table520illustrates one method of operating the assembly30. When button48is in the second state (pressed/depressed), magnetic disc41is coupled to the enclosure31via the button48. When the magnetic disc41is coupled to the enclosure31assembly30is operable in a third operating mode and the second operating mode. In the third operating mode, the spool33is not operable in a magnetic braking mode. In the second operating mode, the spool33is operable in a spring retracting mode.

In the third operating mode, spool33is unable to rotate in the counterclockwise direction. When leash42attempts to extend away from the assembly30, the spool33, first one way bearing43, second one way bearing44, planetary carrier34, and planetary gears35attempt to rotate in the counterclockwise direction. However, the magnetic disc41is coupled to the enclosure31and is unable to rotate in the counterclockwise direction due to being coupled to enclosure31via the button48. As a result, the sun gear37, which is coupled to magnetic disc41, is static and unable to rotate in the counterclockwise direction. Ring gear36is static because it is coupled to the enclosure31. Since the ring gear36and the sun gear37are static, the planetary gears45cannot rotate in the counterclockwise direction. Because the spool33is unable to rotate in the counterclockwise direction, the leash32cannot extend once the button48is pressed.

One novel aspect of the assembly30is that the spool33is operable in the spring retracting mode even when button48is in the second state (pressed/depressed). In other words, the assembly30is operable in the second operating mode. When the spool33is operable in the spring retracting mode, the retractable spring42decompresses and applies rotational force on the spool33. The spool33rotates in a clockwise direction allowing the leash32to retract. In the spring retracting mode, the first one way bearing43freewheels and does not lock to the support rod40. As a result, the support rod40is static and is not driven by the first one way bearing43while the spool33operates in the spring retracting mode. In other words, when the first one way bearing43freewheels, the support rod40, second one way bearing44, planetary carrier34, planet gears35, sun gear37, and magnetic disc41are static regardless of whether or not the button48is depressed. Since the magnetic braking side of the assembly30is disengaged no magnetic braking force is generated when the leash32is retracting.

FIG.11is a cross-sectional diagram of another embodiment of a magnetic braking and spring retraction assembly50. In this embodiment, assembly50includes an enclosure51, a leash52attached to a spool53with a retractable spring62, a planetary carrier54coupled to planetary gears55, a ring gear56, a sun gear57, a magnetic disc61including magnets58, a metal disc59, a support rod60. Assembly50also includes washers coupled to the ends of support rod60and a cover coupled to spool53that are not shown inFIG.11.

In addition, assembly50includes a button68coupled to enclosure51. The button is operable in a first state and a second state. In the first state, button68is not pressed. In the second state, button68is pressed (depressed). The addition of button68allows a user to set an amount of leash52extendable from assembly50.

When button68is in the first state (not pressed), the magnetic disc61is not coupled to the enclosure51. When the magnetic disc61is not coupled to the enclosure51assembly50is operable in a first operating mode and a second operating mode. In the first operating mode, the spool53is operable in a magnetic braking mode. In the second operating mode, the spool53is operable in a spring retracting mode.

When the spool53is operable in the magnetic braking mode, pulling or extending the leash52applies rotational force on the spool53, causing the spool53to rotate in a counterclockwise direction. Additionally, pulling or extending the leash52causes the retractable spring62to compress.

In one novel aspect, assembly50includes only a single one way bearing,63. The one way bearing63can be coupled to various components of assembly50. For example, in the embodiment ofFIG.11, the spool53is coupled to the support rod60via the one way bearing63and the planetary carrier54is coupled to the support rod60. In the magnetic braking mode, the one way bearing63locks to and drives support rod60in a counterclockwise direction. The support rod60drives the planetary carrier54in counterclockwise direction.

In another embodiment, the spool53is coupled to the support rod60and the planetary carrier54is coupled to the support rod60via the one way bearing63. In the example where the spool53is coupled to the support rod60, in the magnetic braking mode, the spool53drives the support rod60in a counterclockwise direction. The one way bearing63locks to the support rod60causing the planetary carrier54to rotate in a counterclockwise direction.

In the example ofFIG.11, the planetary carrier54is coupled to three equally spaced planetary gears55(planet gears). In the magnetic braking mode the planetary carrier54rotates in a counterclockwise direction, driving the planetary gears55along the ring gear56in a counterclockwise direction. In other words, the planetary gears55revolve in a counterclockwise direction around the sun gear57. The ring gear56is static (no rotational speed) due to being coupled to the enclosure51. The planetary gears55cause the sun gear57to rotate in a counterclockwise direction.

In the example ofFIG.11, the sun gear57is coupled to the magnetic disc61. In the magnetic braking mode, the sun gear57and magnetic disc61rotate in a counterclockwise direction. The static metal disc59exerts a drag force (magnetic braking force) on each of the magnets58moving with the rotating magnetic disc61.

When the spool53is operable in the spring retracting mode, the retractable spring62decompresses and applies rotational force on the spool53. The spool53rotates in a clockwise direction allowing the leash52to retract. In the spring retracting mode, the one way bearing63freewheels and does not lock to the support rod40. As a result, the support rod60is static and is not driven by the one way bearing63while the spool53operates in the spring retracting mode. Additionally, the planetary carrier54, planetary gears55, ring gear56, sun gear57, metal disc59, and magnetic disc61are each static and not rotating. In other words, the magnetic braking side of the assembly50is disengaged and no magnetic braking force is generated when the leash52is retracting.

When button68is in the second state (pressed/depressed), magnetic disc61is coupled to the enclosure51via the button68. When the magnetic disc61is coupled to the enclosure51assembly50is operable in a third operating mode and the second operating mode. In the third operating mode, the spool53is not operable in a magnetic braking mode. In the second operating mode, the spool53is operable in a spring retracting mode.

In the third operating mode, spool53is unable to rotate in the counterclockwise direction. When leash62attempts to extend away from the assembly50, the spool53, one way bearing63, planetary carrier54, and planetary gears55attempt to rotate in the counterclockwise direction. However, the magnetic disc61is coupled to the enclosure51and is unable to rotate in the counterclockwise direction due to being coupled to enclosure51via the button68. As a result, the sun gear57, which is coupled to magnetic disc61, is static and unable to rotate in the counterclockwise direction. Ring gear56is static because it is coupled to the enclosure51. Since the ring gear56and the sun gear57are static, the planetary gears55cannot rotate in the counterclockwise direction. Because the spool53is unable to rotate in the counterclockwise direction, the leash52cannot extend once the button68is pressed.

One novel aspect of the assembly50is that the spool63is operable in the spring retracting mode even when button68is in the second state (pressed/depressed). In other words, the assembly50is operable in the second operating mode. When the spool53is operable in the spring retracting mode, the retractable spring62decompresses and applies rotational force on the spool53. The spool53rotates in a clockwise direction allowing the leash52to retract. In the spring retracting mode, the one way bearing63freewheels and does not lock to the support rod60. As a result, the support rod60is static and is not driven by the one way bearing63while the spool53operates in the spring retracting mode. In other words, when the one way bearing63freewheels, the support rod60, planetary carrier54, planet gears55, sun gear57, and magnetic disc61are static regardless of whether or not the button68is depressed. Since the magnetic braking side of the assembly50is disengaged no magnetic braking force is generated when the leash52is retracting.

FIG.12is a cross-sectional diagram of another embodiment of a magnetic braking and spring retraction assembly70. In this embodiment, assembly70includes an enclosure71, a leash72attached to a spool73with a retractable spring82, a planetary carrier74coupled to planetary gears75, a ring gear76, a sun gear77, a magnetic disc81including magnets78, and a support rod80. Assembly70also includes washers coupled to the ends of support rod80and a cover coupled to spool73that are not shown inFIG.12.

In addition, assembly70includes a button68coupled to enclosure71. The button is operable in a first state and a second state. In the first state, button68is not pressed. In the second state, button68is pressed (depressed). The addition of button68allows a user to set an amount of leash72extendable from assembly70.

When button68is in the first state (not pressed), the magnetic disc81is not coupled to the enclosure71. When the magnetic disc81is not coupled to the enclosure71assembly70is operable in a first operating mode and a second operating mode. In the first operating mode, the spool73is operable in a magnetic braking mode. In the second operating mode, the spool73is operable in a spring retracting mode.

When the spool73is operable in the magnetic braking mode, pulling or extending the leash72applies rotational force on the spool73, causing the spool73to rotate in a counterclockwise direction. Additionally, pulling or extending the leash72causes the retractable spring82to compress.

In one novel aspect, assembly70includes only a single one way bearing,63. The one way bearing63can be coupled to various components of assembly70. For example, in the embodiment ofFIG.12, the spool73is coupled to the support rod80via the one way bearing63and the planetary carrier74is coupled to the support rod80. In the magnetic braking mode, the one way bearing63locks to and drives support rod80in a counterclockwise direction. The support rod80drives the planetary carrier74in counterclockwise direction.

In another embodiment, the spool73is coupled to the support rod80and the planetary carrier74is coupled to the support rod80via the one way bearing63. In the example where the spool73is coupled to the support rod80, in the magnetic braking mode, the spool73drives the support rod60in a counterclockwise direction. The one way bearing63locks to the support rod60causing the planetary carrier74to rotate in a counterclockwise direction.

In the example ofFIG.12, the planetary carrier74is coupled to three equally spaced planetary gears75(planet gears). In the magnetic braking mode the planetary carrier74rotates in a counterclockwise direction, driving the planetary gears75along the ring gear76in a counterclockwise direction. In other words, the planetary gears75revolve in a counterclockwise direction around the sun gear77. The ring gear76is static (no rotational speed) due to being coupled to the enclosure71. The planetary gears75cause the sun gear77to rotate in a counterclockwise direction.

One novel aspect of the assembly70is that the enclosure71is made of metal. One benefit of using metal for the enclosure71is that there is no need for a metal disc because the enclosure71can generate a magnetic braking force. Another benefit of using metal for the enclosure71would be the durability of the assembly70.

In the example ofFIG.12, the sun gear77is coupled to the magnetic disc81. In the magnetic braking mode, the sun gear77and magnetic disc81rotate in a counterclockwise direction. The enclosure71exerts a drag force (magnetic braking force) on each of the magnets78moving with the rotating magnetic disc81.

When the spool73is operable in the spring retracting mode, the retractable spring82decompresses and applies rotational force on the spool73. The spool73rotates in a clockwise direction allowing the leash72to retract. In the spring retracting mode, the one way bearing63freewheels and does not lock to the support rod40. As a result, the support rod60is static and is not driven by the one way bearing63while the spool73operates in the spring retracting mode. Additionally, the planetary carrier74, planetary gears75, ring gear76, sun gear77, and magnetic disc81are each static and not rotating. In other words, the magnetic braking side of the assembly70is disengaged and no magnetic braking force is generated when the leash72is retracting.

When button68is in the second state (pressed/depressed), magnetic disc61is coupled to the enclosure71via the button68. When the magnetic disc61is coupled to the enclosure71assembly70is operable in a third operating mode and the second operating mode. In the third operating mode, the spool73is not operable in a magnetic braking mode. In the second operating mode, the spool73is operable in a spring retracting mode.

In the third operating mode, spool73is unable to rotate in the counterclockwise direction. When leash82attempts to extend away from the assembly70, the spool73, one way bearing63, planetary carrier74, and planetary gears75attempt to rotate in the counterclockwise direction. However, the magnetic disc61is coupled to the enclosure71and is unable to rotate in the counterclockwise direction due to being coupled to enclosure71via the button68. As a result, the sun gear57, which is coupled to magnetic disc61, is static and unable to rotate in the counterclockwise direction. Ring gear76is static because it is coupled to the enclosure71. Since the ring gear76and the sun gear57are static, the planetary gears75cannot rotate in the counterclockwise direction. Because the spool73is unable to rotate in the counterclockwise direction, the leash72cannot extend once the button68is pressed.

One novel aspect of the assembly70is that the spool63is operable in the spring retracting mode even when button68is in the second state (pressed/depressed). In other words, the assembly70is operable in the second operating mode. When the spool73is operable in the spring retracting mode, the retractable spring82decompresses and applies rotational force on the spool73. The spool73rotates in a clockwise direction allowing the leash72to retract. In the spring retracting mode, the one way bearing63freewheels and does not lock to the support rod60. As a result, the support rod60is static and is not driven by the one way bearing63while the spool73operates in the spring retracting mode. In other words, when the one way bearing63freewheels, the support rod60, planetary carrier74, planet gears75, sun gear57, and magnetic disc61are static regardless of whether or not the button68is depressed. Since the magnetic braking side of the assembly50is disengaged no magnetic braking force is generated when the leash72is retracting.

FIG.13is a table530that illustrates various methods of operating a magnetic braking and spring retracting assembly.

FIG.14is a cross sectional diagram of another embodiment of a magnetic braking and spring retraction assembly90. In this embodiment, assembly90includes an enclosure91, a spool93, a planetary carrier94coupled to planetary gears95, a one way bearing103, a sun gear97, a metal disc99, and a support rod100. Ends of support rod100are coupled to the enclosure91such that the support rod100does not move or rotate. Furthermore, assembly90includes a first shaft109, a second shaft110, a third shaft110, making assembly90more robust. Although not shown, assembly90includes a leash that is coupled to the spool93.

Assembly90also includes a retractable spring102, a cover107, a coiled spring114, an outer spring housing112, and an inner spring housing113. The use of multiple springs allows assembly90to withstand a heavier load on the leash.

One novel aspect of assembly90is that a ring gear96and magnets98are disposed within the spool93, thereby reducing the number of moving components and reducing the overall size required for enclosure91.

In addition, assembly90includes a button108coupled to enclosure91. The button108is operable in a first state and a second state. In the first state, button108is not pressed. In the second state, button108is pressed (depressed). The addition of button108allows a user to set an amount of leash extendable from assembly90. A more in-depth explanation regarding the operative components of assembly90is described in the detailed description below.

FIG.15is a diagram of the magnetic braking and spring retraction assembly90and a corresponding table540. Table540illustrates one method of operating the assembly90.

When button108is in the first state (not pressed), the metal disc99is not coupled to the enclosure91. When the metal disc99is not coupled to the enclosure91, assembly90is operable in a first operating mode and a second operating mode. In the first operating mode, the spool93is operable in a magnetic braking mode. In the second operating mode, the spool93is operable in a spring retracting mode.

In the first operating mode, as the leash extends away from the assembly90, the spool93rotates in a counterclockwise direction. The ring gear96disposed within the spool93rotates in a counterclockwise direction. The ring gear96causes each planetary gear95to rotate in a counterclockwise direction. The planetary gears95do not revolve around the sun gear97. Rather, the planetary gears95drive the sun gear97such that the sun gear97rotates in the clockwise direction. The sun gear97is coupled to the second shaft110via the one way bearing103. In the magnetic braking mode, the one way bearing103locks to the second shaft110which is coupled to the metal disc99. The metal disc99is rotating clockwise while the magnets98disposed in the spool93rotate in the counterclockwise direction. The metal disc99exerts a drag force (magnetic braking force) on each of the magnets98moving with the rotating spool91.

In the magnetic braking mode, the retractable spring102is compressing while the coiled spring114remains static. The coiled spring114remains static because the planetary carrier94is not rotating.

One novel aspect of the assembly90is that the spool93is operable in the spring retracting mode even when button108is in the second state (pressed/depressed). In other words, the assembly90is operable in the fourth operating mode.

When the spool93is operable in the spring retracting mode, the retractable spring102decompresses and applies rotational force on the spool93, causing the spool93to rotate in a clockwise direction. The ring gear96is disposed within the spool93and rotates in a clockwise direction. The ring gear96causes each planetary gear95to rotate in a clockwise direction. Importantly, the planetary gears95do not revolve around the sun gear97. Since the planetary gears95coupled to the planetary carrier94are not revolving, the planetary carrier94remains static and does not drive the first shaft109. The third shaft110and the coiled spring remain static.

The planetary gears95drive the sun gear97in the counterclockwise direction. The sun gear97is coupled to the second shaft110via the one way bearing103. In the spring retracting mode, as the sun gear97rotates counter clockwise, the one way bearing freewheels in the counterclockwise direction. The second shaft110and metal disc99are static and are not being driven by the one way bearing. In other words, the magnetic braking side of the assembly90is disengaged and no magnetic braking force is generated when the leash is retracting.

FIG.16is a diagram of the magnetic braking and spring retraction assembly90and a corresponding table550. Table550illustrates one method of operating the assembly90.

When button108is in the second state (pressed/depressed), the metal disc99is coupled to the enclosure91via the button108. When the metal disc99is coupled to the enclosure91, assembly90is operable in a third operating mode and a fourth operating mode. In the third operating mode, the spool93is operable in a limited magnetic braking mode. In the fourth operating mode, the spool93is operable in a spring retracting mode.

In the third operating mode, the metal disc99and the second shaft110are static. As a result, the one way bearing103and the sun gear97are static. When the leash extends away from the assembly90, the spool93rotates in a counterclockwise direction. The ring gear96is disposed within the spool93and rotates in a counterclockwise direction. The ring gear96causes each planetary gear95to rotate in a counterclockwise direction. The planetary gears95revolve in a counterclockwise direction around the sun gear97. The planetary gears95coupled to the planetary carrier94and cause the planetary carrier94to rotate in a counterclockwise direction. The first shaft109is coupled to the planetary carrier94and drives the third shaft110in the counterclockwise direction.

In the limited magnetic braking mode, the coiled spring114is compressing. While the coiled spring114is compressing, the spool93is operable in the magnetic braking mode. Once the coiled spring114is fully compressed, the coiled spring114prevents the spool93from further rotating in the counterclockwise direction.

One novel aspect of the assembly90is that the spool93is operable in the spring retracting mode even when button108is in the second state (pressed/depressed). In other words, the assembly90is operable in the fourth operating mode.

In the fourth operable mode, the metal disc99and the second shaft110are static. As a result, the one way bearing103and the sun gear97are static. In the fourth operating mode, the coiled spring114is decompressing and applies rotational force in the clockwise direction. The retractable spring102is also decompressing and applies rotational force in the clockwise direction.

The planetary carrier94rotates in the clockwise direction and drives the planetary gears95to rotate in a clockwise direction. Since the sun gear97is static, as the planetary gears95drive the ring gear96in the clockwise direction while revolving around the sun gear97. As a result, the spool93rotates in the clockwise direction, retracting the leash towards the assembly.

FIG.17is a perspective diagram of the magnetic braking and spring retraction assembly90.FIG.17shows the outer spring housing112of assembly90.

FIG.18is another perspective diagram of the magnetic braking and spring retraction assembly90.FIG.18shows the magnets98disposed within the spool93of assembly90.

FIG.19is a cross-sectional perspective diagram of the magnetic braking and spring retraction assembly90.FIG.19shows the cover107of assembly90with a portion of the cover107removed.

FIG.20is a cross-sectional perspective diagram of the magnetic braking and spring retraction assembly90.FIG.20shows the inner spring housing113and the outer spring housing112.

FIG.21is a cross-sectional perspective diagram of the magnetic braking and spring retraction assembly90. The cover is not shown inFIG.21.

FIG.22is a perspective diagram of the magnetic braking and spring retraction assembly90. The metal disc99is not shown inFIG.22.

FIG.23is a cross-sectional perspective diagram of the magnetic braking and spring retraction assembly90.FIG.23shows the sun gear97coupled to the second shaft110via the one way bearing103. The metal disc99is not shown inFIG.23.

FIG.24is a cross-sectional perspective diagram of the magnetic braking and spring retraction assembly90.FIG.24shows the planetary gears95coupled to the planetary carrier94. The metal disc99is not shown inFIG.24.

FIG.25is a cross sectional diagram of another embodiment of a magnetic braking and spring retraction assembly120. In this embodiment, assembly120includes an enclosure121, a leash122, a spool123, a planetary carrier124, planetary gears125, a ring gear126, a one way bearing133, a sun gear127, a magnetic disc131with magnets128, a metal disc129, and a support rod130. In this embodiment, ends of support rod130are coupled to the enclosure121such that the support rod130does not move or rotate. Furthermore, assembly120includes a first shaft139, a second shaft140, and a third shaft141, making assembly120more robust.

Assembly120also includes a retractable spring132, a cover137, a coiled spring144, an outer spring housing142, and an inner spring housing143. The use of multiple springs allows assembly120to withstand a heavier load on the leash.

The ring gear126and magnets128are disposed within the spool123, thereby reducing costs relating to fabricating multiple components. The components of assembly120allow for a more compact enclosure121while still providing ample magnetic braking force.

Assembly120includes a button138coupled to enclosure121. The button138is operable in a first state and a second state. In the first state, button138is not pressed. In the second state, button138is pressed (depressed). The addition of button138allows a user to set an amount of leash extendable from assembly120. A more in-depth explanation regarding the operative components of assembly120is described in the detailed description below.

When button138is in the first state (not pressed), the magnetic disc131is not coupled to the enclosure121. When the magnetic disc131is not coupled to the enclosure121, assembly120is operable in a first operating mode and a second operating mode. In the first operating mode, the spool123is operable in a magnetic braking mode. In the second operating mode, the spool123is operable in a spring retracting mode.

In the first operating mode, as the leash extends away from the assembly120, the spool123rotates in a counterclockwise direction. The ring gear126disposed within the spool123rotates in a counterclockwise direction. The ring gear126causes each planetary gear125to rotate in a counterclockwise direction. The planetary gears125do not revolve around the sun gear127. Rather, the planetary gears125drive the sun gear127such that the sun gear127rotates in the clockwise direction. The sun gear127is coupled to the second shaft140via the one way bearing133.

In another embodiment, the second shaft140is coupled to the support rod130via the one way bearing133. In the embodiment where the second shaft140is coupled to the support rod130via the one way bearing133, the sun gear127is coupled to the support rod130. Additionally, ends of the support rod130are coupled to the enclosure121via washers. Coupling the support rod130to the enclosure121prevents the support rod130from moving laterally while still allowing the support rod130to rotate radially. The addition of washers reduces damage caused to the enclosure121due to the rotating support rod130. When the sun gear127rotates in the clockwise direction, the sun gear127drives support rod130causing the one way bearing133to lock to the support rod130. Because the second shaft140is coupled to the one way bearing133, the second shaft140also rotates in the clockwise direction in the first operating mode.

In the magnetic braking mode, the one way bearing133locks to the second shaft140which is coupled to the magnetic disc131. The magnets128disposed in the magnetic disc131rotate counterclockwise. The static metal disc129exerts a drag force (magnetic braking force) on each of the magnets128moving with the rotating magnetic disc131.

In the magnetic braking mode, the retractable spring132is compressing while the coiled spring144remains static. The coiled spring144remains static because the planetary carrier124is not rotating.

When the spool123is operable in the spring retracting mode, the retractable spring132decompresses and applies rotational force on the spool123, causing the spool123to rotate in a clockwise direction. The ring gear126is disposed within the spool123and rotates in a clockwise direction. The ring gear126causes each planetary gear125to rotate in a clockwise direction. Importantly, the planetary gears125do not revolve around the sun gear127. Since the planetary gears125coupled to the planetary carrier124are not revolving, the planetary carrier124remains static and does not drive the first shaft139. The third shaft141and the coiled spring remain static.

The planetary gears125drive the sun gear127in the counterclockwise direction. The sun gear127is coupled to the second shaft140via the one way bearing133. In the spring retracting mode, as the sun gear127rotates counter clockwise, the one way bearing freewheels in the counterclockwise direction. The second shaft140and magnetic disc131are static and are not being driven by the one way bearing. In other words, the magnetic braking side of the assembly120is disengaged and no magnetic braking force is generated when the leash122is retracting.

When button138is in the second state (pressed/depressed), the magnetic disc131is coupled to the enclosure121via the button138. When the magnetic disc131is coupled to the enclosure121, assembly120is operable in a third operating mode and a fourth operating mode. In the third operating mode, the spool123is operable in a limited magnetic braking mode. In the fourth operating mode, the spool123is operable in a spring retracting mode.

In the third operating mode, the magnetic disc131and the second shaft140are static. As a result, the one way bearing133and the sun gear127are static. When the leash extends away from the assembly120, the spool123rotates in a counterclockwise direction. The ring gear126is disposed within the spool123and rotates in a counterclockwise direction. The ring gear126causes each planetary gear125to rotate in a counterclockwise direction. The planetary gears125revolve in a counterclockwise direction around the sun gear127. The planetary gears125coupled to the planetary carrier124and cause the planetary carrier124to rotate in a counterclockwise direction. The first shaft139is coupled to the planetary carrier124and drives the third shaft141in the counterclockwise direction.

In the third operating mode, the coiled spring144is compressing. While the coiled spring144is compressing, the spool123rotates in a counterclockwise direction. Once the coiled spring144is fully compressed, the coiled spring144prevents the spool123from further rotating in the counterclockwise direction.

Importantly, in the third operating mode, no magnetic braking occurs because the magnetic disc131is static.

One novel aspect of the assembly120is that the spool123is operable in the spring retracting mode even when button138is in the second state (pressed/depressed). In other words, the assembly120is operable in the fourth operating mode.

In the fourth operable mode, the magnetic disc131and the second shaft140are static. As a result, the one way bearing133and the sun gear127are static. In the fourth operating mode, the coiled spring144is decompressing and applies rotational force in the clockwise direction. The retractable spring132is also decompressing and applies rotational force in the clockwise direction.

The planetary carrier124rotates in the clockwise direction and drives the planetary gears125to rotate in a clockwise direction. Since the sun gear127is static, as the planetary gears125drive the ring gear126in the clockwise direction while revolving around the sun gear127. As a result, the spool123rotates in the clockwise direction, retracting the leash towards the assembly.

FIG.26is a table530in accordance with one novel aspect.

FIG.27is a flowchart of a method1000in accordance with one novel aspect. In a first step (step1001), a spool and a one way bearing are operated in one of two modes. In a magnetic braking mode, the spool rotates in a first direction (clockwise or counterclockwise). In the spring retracting mode, the spool rotates in a second direction (counterclockwise or clockwise). In one of the two modes, the one way bearing locks and in another of the two modes the one way bearing freewheels.

FIG.28is a flowchart of a method2000in accordance with another novel aspect. In a first step (step2001), a spool and a one way bearing are operated in one of two modes. In a magnetic braking mode, the spool rotates in a first direction (clockwise or counterclockwise). In the spring retracting mode, the spool rotates in a second direction (counterclockwise or clockwise). In one of the two modes, the one way bearing locks and in another of the two modes the one way bearing freewheels. In a second step (step2002), a button is operated in one of two states. In a first state, the spool is operable in the magnetic braking mode. In a second state, the spool is operable in the spring retracting mode.

FIG.29is a cross sectional diagram of another embodiment of a magnetic braking and spring retraction assembly220. In this embodiment, assembly220includes an enclosure221, a leash222, a spool223, a planetary carrier224, planetary gears225, a ring gear226, a one way bearing233, a sun gear227, a magnetic disc231with magnets228, a metal disc229, and a support rod230.

In this embodiment, ends of support rod230are coupled to the enclosure221via freewheeling bearings. A freewheeling bearing is a bearing that does not lock when rotating in a clockwise or counterclockwise direction (e.g. nylon washer). Coupling the support rod230to the enclosure221prevents the support rod230from moving laterally while still allowing the support rod230to rotate radially. The addition of bearings reduces damage caused to the enclosure221due to the rotating support rod230.

In another embodiment, ends of the support rod220are coupled to the enclosure221such that the support rod230does not move or rotate.

In the embodiment shown inFIG.29, assembly220includes a retractable spring232, a cover237, a coiled spring shaft241, an outer spring housing242, and an inner spring housing243, and a coiled spring244. The use of multiple springs allows for an additional mode of damping via the coiled spring244. The inner spring housing243is coupled to the support rod230and is coupled to the coiled spring shaft241. Coiled spring shaft241is coupled to spool223via the retracting spring232.

The ring gear226is coupled to the spool223. The ring gear226is not directly coupled to the enclosure221or support rod230.

The sun gear227is coupled to the magnetic disc231. The magnetic disc231contains a plurality of holes in which may or may not contain magnets228. The strength of the magnetic braking force is adjustable and depends on the number and size of magnets228contained in the magnetic disc231.

Assembly220includes a button238coupled to enclosure221. The button238is operable in a first state and a second state. In the first state, button238is not pressed. In the second state, button238is pressed (depressed). The addition of button238allows a user to set an amount of leash extendable from assembly220. For example, when button238is depressed the rotation speed of magnetic disc231is slowed. In another example, when button238is depressed the magnetic disc231is stopped from rotating.

When button238is in the first state (not pressed), the magnetic disc231is not coupled to the enclosure221. When the magnetic disc231is not coupled to the enclosure221, assembly220is operable in a first operating mode and a second operating mode. In the first operating mode, the spool223is operable in a magnetic braking mode. In the second operating mode, the spool223is operable in a spring retracting mode.

In the first operating mode, as the leash extends away from the assembly220, the spool223rotates in a counterclockwise direction. The retractable spring232is compressing as the spool223rotates counterclockwise. The coiled spring244and the coiled spring shaft241remain static. The coiled spring244is coupled to the support rod230and the support rod230is coupled to the one way bearing233. The tension of coiled spring244prevents the support rod230and planetary carrier224from rotating in a counterclockwise direction.

The ring gear226, which is coupled to the spool223, rotates in a counterclockwise direction. The ring gear226causes each of the planetary gears225to rotate in a counterclockwise direction. The planetary gears225do not revolve around the sun gear227because the planetary carrier224is prevented from rotating in a counterclockwise direction. Rather, planetary gears225drive the sun gear227such that the sun gear227rotates in the clockwise direction. The sun gear227is coupled to the magnetic disc231. The magnetic disc231, which contains magnets228, rotates in the clockwise direction. The static metal disc229and each of the magnets228generate eddy currents which creates a drag force (magnetic braking force). The strength of the magnetic braking force can be calibrated based on the number of magnets228that are disposed within the magnetic disc231.

In the second operating mode, the spool223is operable in the spring retracting mode. When the spool223is operable in the spring retracting mode, the retractable spring232decompresses and applies rotational force on the spool223, causing the spool223and ring gear226to rotate in a clockwise direction. The ring gear226drives the planetary carrier224in the clockwise direction. The sun gear227is not being driven and will either be static or idle in a clockwise direction. The planetary carrier224is allowed to freely revolve clockwise due to the one way bearing233freewheeling in the clockwise direction. As a result, any eddy currents created by the rotation of the magnetic disc231will not cause magnetic braking to the ring gear226or spool223.

When button238is in the second state (pressed/depressed), the magnetic disc231is coupled to the enclosure221via the button238. When the magnetic disc231is coupled to the enclosure221, assembly220is operable in a third operating mode and a fourth operating mode. In the third operating mode and the fourth operating mode, no magnetic braking occurs because the magnetic disc231and sun gear227are static.

In the third operating mode, the magnetic disc231and sun gear227are static. When the leash222extends away from the assembly220, the spool223rotates in a counterclockwise direction. The ring gear226, which is coupled to the spool223, rotates in a counterclockwise direction. The ring gear226causes each of the planetary gears225to rotate in a counterclockwise direction. Each of the planetary gears225revolve in a counterclockwise direction around the sun gear227, due to the sun gear227being static. The planetary gears225are coupled to the planetary carrier224and cause the planetary carrier224to rotate in a counterclockwise direction. The planetary carrier224is coupled to the one way bearing233, which locks to the support rod230in the counterclockwise direction. The support rod230is directly coupled to the inner spring housing243. Rotating the support rod230in the counterclockwise direction causes the coiled spring244to compress. Once the coiled spring244is fully compressed, the coiled spring244prevents the spool223from further rotating in the counterclockwise direction. Importantly, in the third operating mode, no magnetic braking occurs because the magnetic disc231is static.

In the fourth operating mode, the magnetic disc231and sun gear227are static. The coiled spring244decompresses and applies rotational force in the clockwise direction. Since the coiled spring244is applying clockwise rotational force on the inner spring housing243, the inner spring housing243drives the coiled spring shaft241and the support rod230to rotate clockwise. When the support rod230rotates in the clockwise direction, tension from the coiled spring244is applied to the one way bearing233, locking the support rod230to the one way bearing233. The one way bearing233drives the planetary carrier224in the clockwise direction. The planetary gears225revolve around sun gear227in a clockwise direction causing the spool223to rotate in the clockwise direction, retracting the leash222towards the assembly. The retractable spring232is also decompressing and applies rotational force on the spool223in the clockwise direction. Once the coiled spring244is fully decompressed, the retractable spring232takes over in applying rotation force on the spool223.

Although certain specific embodiments are described above for instructional purposes, the teachings of this patent document have general applicability and are not limited to the specific embodiments described above.

For example, the size and number of planet gears, magnets, and/or magnetic discs can be altered and/or optimized. In another example, another mechanism besides a button is used to couple components to the enclosure. In yet another example, an enclosure of an assembly includes an attachment mechanism. In one example, the attachment mechanism is a belt loop. SeeFIG.25attachment mechanism150. In another example, the attachment mechanism can be coupled to other objects (e.g. a stake in the ground).

Accordingly, various modifications, adaptations, and combinations of various features of the described embodiments can be practiced without departing from the scope of the invention as set forth in the claims.