Line dispensing devices
A line dispensing device includes a housing, a rotatable shaft rotatably supported by the housing and defining a rotational axis, and a line drum disposed about the rotational axis and configured to extend and retract a line from the housing. The line dispensing device also includes a retraction assembly disposed about the rotational axis and configured to generate a retraction force and retract the line from the housing, and a braking assembly disposed about the rotational axis and configured to generate a braking force on the line and during extension of the line from the housing.
1 . A line dispensing device comprising:
a housing having a first body and a second body coupled together, the first body different than the second body with the first body including a base wall and the second body including an outer wall, the first body coupled to the second body such that a first cavity is defined between the base wall of the first body and the outer wall of the second body and a second cavity is defined by the base wall of the first body;
a rotatable shaft rotatably supported by the housing within the first cavity and defining a rotational axis, wherein the rotatable shaft is supported by bearings disposed on the base wall of the first body and the outer wall of the second body such that one end of the rotatable shaft is cantilevered into the second cavity, the first cavity discrete from the second cavity and adjacent to one another along the rotational axis;
a line drum disposed within the first cavity about the rotational axis and configured to extend and retract a line from the housing;
a retraction assembly including a coil spring disposed within the first cavity about the rotational axis and coupled to the line drum, the retraction assembly configured to generate a retraction force and retract the line into the housing; and
an eddy current braking assembly disposed within the second cavity about the rotational axis and configured to generate an eddy current braking force on the rotatable shaft and during extension of the line from the housing, wherein the eddy current braking assembly comprises:
a stator assembly coupled to the first body of the housing;
a rotor assembly coupled to the cantilevered portion of the rotatable shaft and rotatable around the rotational axis; and
one or more conductors and one more magnets configured to generate the eddy current braking force.
2 . The line dispensing device of claim 1 , wherein the rotor assembly has the one or more conductors and the stator assembly has the one or more magnets.
3 . The line dispensing device of claim 2 , wherein the stator assembly comprises a pair of plates each having a plurality of keys extending therefrom, and wherein the one or more magnets are coupled to the pair of plates and the plurality of keys at least partially define a polarity orientation of the one or more magnets.
4 . The line dispensing device of claim 1 , wherein the line drum is coupled to the rotatable shaft and rotatable around the rotational axis, and wherein the line drum is rotatable around the rotational axis at a different speed than the rotatable shaft.
5 . The line dispensing device of claim 1 , further comprising a transmission coupled between the line drum and the rotatable shaft so that rotation of the line drum drives rotation of the rotatable shaft.
6 . The line dispensing device of claim 1 , wherein the retraction assembly is rotatable around the rotational axis, and wherein the retraction assembly is rotatable around the rotational axis at a different speed than the rotatable shaft.
7 . The line dispensing device of claim 1 , wherein one end of the rotatable shaft comprises a female spline connector configured to receive another exterior shaft and drive rotation thereof.
8 . The line dispensing device of claim 1 , wherein the line drum includes:
a pair of drum plates; and
a hub supported on the rotatable shaft and disposed between the pair of drum plates, the hub including a pair of opposing planar surfaces and a pair of opposing arcuate projections spaced from the hub, the pair of opposing planer surfaces and the pair of opposing arcuate projections circumferentially alternating around the rotational axis, and wherein the line is coupled to the hub via a short webbing attached to one of the arcuate projections.
9 . The line dispensing device of claim 1 , wherein the stator assembly comprises a pair of plates supporting a plurality of magnets of the one or more magnets, wherein the pair of plates each include a plurality of lugs circumferentially spaced around the rotational axis and keys disposed between a pair of lugs of the plurality of lugs, the respective key offset between the pair of lugs, and wherein each of the plurality of magnets includes an offset aperture configured to receive the key, wherein each of the plurality of magnets is coupled to the respective plate at the keys such that a predetermined polarity is ensured, and wherein the rotor assembly includes the one or more conductors.
10 . A line dispensing device comprising:
a housing having a first body and a second body defining an interior cavity, the first body also defining an external cavity separated from the interior cavity;
a rotatable shaft rotatable around a rotational axis, the rotatable shaft disposed within the interior cavity and rotatably supported between the first body and the second body, wherein one end of the rotatable shaft cantilevers into the external cavity, the interior cavity and the external cavity adjacent one another along the rotational axis;
a line drum housing a line supported on the rotatable shaft, disposed in the interior cavity and configured to rotate about the rotational axis during extension and retraction of the line, wherein the line drum includes:
a pair of drum plates; and
a hub supported on the rotatable shaft and disposed between the pair of drum plates, the hub including a pair of opposing planer surfaces and a pair of opposing arcuate projections spaced from the hub, the pair of opposing planer surfaces and the pair of opposing arcuate projections circumferentially alternating around the rotational axis, and wherein the line is coupled to the hub via a short webbing attached to one of the arcuate projections;
a transmission extending disposed within the interior cavity between the line drum and the rotatable shaft so that rotation of the line drum drives corresponding rotation of the rotatable shaft; and
a braking assembly disposed about the rotational axis and configured to generate a braking force on the rotatable shaft and during extension of the line from the housing, the braking assembly disposed within the external cavity, wherein the braking assembly comprises:
a stator assembly coupled to the first body of the housing; and
a rotor assembly coupled to the cantilevered portion of the rotatable shaft and rotatable around the rotational axis.
11 . The line dispensing device of claim 10 , wherein the transmission comprises:
a sun gear coupled to the rotatable shaft;
an internal gear co-axial with the sun gear and fixed relative to the rotational axis; and
a plurality of planet gears meshed with the sun gear and the internal gear, wherein the plurality of planet gears are supported on the line drum.
12 . The line dispensing device of claim 10 , wherein the housing has a nozzle that the line extends through, wherein the nozzle includes a pair of covers that are pivotably coupled to the housing.
13 . The line dispensing device of claim 12 , further comprising a guide roller proximate the nozzle, wherein the guide roller is rotatably supported by a pair of shoulders defined by the housing.
14 . The line dispensing device of claim 10 , further comprising a retraction assembly coupled to the line drum, wherein the retraction assembly comprises:
a coil spring coupled to the hub; and
a pair of flexible plates sandwiching the coil spring therebetween.
15 . A line dispensing device comprising:
a housing defining an interior cavity and an external cavity;
a rotatable shaft rotatably supported by the housing and defining a rotational axis, wherein one end of the rotatable shaft is cantilevered within the external cavity;
a line drum disposed about the rotational axis within the interior cavity and configured to extend and retract a line from the housing;
a transmission disposed within the interior cavity and extending between the line drum and the rotatable shaft so that rotation of the line drum drives corresponding rotation of the rotatable shaft;
a retraction assembly disposed about the rotational axis within the interior cavity and configured to generate a retraction force and retract the line into the housing; and
a braking assembly at least partially disposed within the external cavity and configured to apply a braking force on the rotatable shaft and during extension of the line from the housing, the braking assembly separated from the line drum and the retraction assembly via the housing, wherein the braking assembly comprises:
a stator assembly coupled to the housing, the stator assembly comprising a pair of plates supporting a plurality of magnets, wherein the pair of plates each include a plurality of lugs circumferentially spaced around the rotational axis and keys disposed between a pair of lugs of the plurality of lugs, the respective key offset between the pair of lugs, and wherein each of the plurality of magnets includes an offset aperture configured to receive the key, wherein each of the plurality of magnets is coupled to the respective plate at the keys such that a predetermined polarity is ensured; and
a rotor assembly having one or more conductors coupled to the cantilevered portion of the rotatable shaft and rotatable around the rotational axis.
16 . The line dispensing device of claim 15 , wherein the pair of plates have an outer perimeter with one or more male pins that selectively engage with corresponding female receptors defined within the external cavity.
17 . The line dispensing device of claim 15 , wherein the rotor assembly comprises:
a pair of rotor plates having at least one bent tab extending therefrom;
the one or more conductors pivotably coupled to the pair of rotor plates; and
at least one biasing element extending between the at least one bent tab and the one or more conductors.
18 . The line dispensing device of claim 17 , wherein the biasing element comprises hooks or loops at each end that directly engage with the at least one bent tab and the one or more conductors.