# US 11,898,734 B2 · Heat sink > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,898,734 B2 - Document ID: US11898734B2 - Status: Granted - Kind: B2 - Application number: 17/057,268 - Filed: 2020-09-16 - Published: 2022-09-22 - Granted: 2024-02-13 - Earliest claimed: 2019-09-17 - Assignees: Milwaukee Electric Tool Corporation - Applicants: Milwaukee Electric Tool Corporation - Inventors: Brian Cornell; Alan Amundson; Duane W. Wenzel; Dalton F. Hansen; Tyler Young - Web page: https://patentgrep.com/patent/US11898734B2 ## CPC - F21V 29/74: with fins or blades - H05K 7/209: {Heat transfer by conduction from internal heat source to heat radiating structure (H05K7/20909 takes precedence)} - F21L 4/00: Electric lighting devices with self-contained electric batteries or cells - F21V 29/508: of electrical circuits - F21V 29/60: characterised by the use of a forced flow of gas, e.g. air - F21V 29/71: using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements - H02J 7/70: characterised by the mechanical construction - H05K 7/20445: {the coupling element being an additional piece, e.g. thermal standoff} - H05K 7/20918: {the components being isolated from air flow, e.g. hollow heat sinks, wind tunnels or funnels} - F21W 2131/1005: {of working places, building sites or the like} - H02J 7/855: {with circuits adapted for supplying loads from the battery} - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - F21L: LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS ## Abstract A charger for an electrical device (e.g., site light) includes a housing defining an interior cavity, and one or more openings formed in the housing. The one or more openings fluidly communicate the interior cavity with an exterior of the charger. A heat sink is at least partially disposed in the housing and operable to dissipate heat produced in the housing. A first portion of the heat sink is positioned within the interior cavity. A second portion of the heat sink is positioned in the one or more openings such that the heat sink is at least partially exposed to the exterior. The heat sink is in heat transfer relationship with components of charger electronics of the charger. ## Claims ### Claim 1 A charger for an electrical device, the charger comprising: a housing having a plurality of walls defining an interior cavity, the housing including an inner housing member connected to one of the walls and separating a housing volume of the housing into a first interior cavity and a second interior cavity; one or more openings formed in the housing, the one or more openings fluidly communicating the interior cavity with an exterior of the charger; and a heat sink at least partially disposed in the housing and operable to dissipate heat produced in the housing, a first portion of the heat sink positioned within the interior cavity, a second portion of the heat sink positioned in the one or more openings such that the heat sink is at least partially exposed to the exterior, the heat sink in heat transfer relationship with components of charger electronics of the charger. ### Claim 2 (depends on 1) The charger of claim 1, wherein the second portion forms one or more fins extending from the first portion, the one or more fins extending toward the one or more openings. ### Claim 3 (depends on 2) The charger of claim 2, wherein the one or more fins extend through the one or more openings to the exterior of the charger. ### Claim 4 (depends on 1) The charger of claim 1, further comprising a printed circuit board having the charger electronics and positioned within the interior cavity, the first portion of the heat sink coupled to the printed circuit board. ### Claim 5 (depends on 1) The charger of claim 1, further comprising a fan supported by the housing, wherein the fan is positioned exterior to the housing, and wherein the fan is operable to pass air over the second portion. ### Claim 6 (depends on 5) The charger of claim 5, wherein the fan has a rotational axis that extends parallel with a longitudinal axis of the one or more openings. ### Claim 7 (depends on 1) The charger of claim 1, wherein the plurality of walls define a plurality of sides and an end connecting the plurality of sides of the housing, and wherein the one or more openings is positioned on one of one of the plurality of sides and the end of the housing. ### Claim 8 (depends on 1) The charger of claim 1, wherein the first portion of the heat sink has a C-shape cross-sectional shape formed by a first section, a second section spaced from the first section, and an intermediate section extending therebetween, wherein the first section is coupled to a printed circuit board of the charger, and wherein the second portion extends from the second section toward the one or more openings. ### Claim 9 (depends on 8) The charger of claim 8, wherein one or more of the first section, the second section, and the intermediate section includes at least one rib. ### Claim 10 (depends on 1) The charger of claim 1, wherein the housing includes a longitudinal axis extending therethrough, and wherein the one or more openings extends along parallel with or perpendicular to the longitudinal axis. ### Claim 11 (depends on 10) The charger of claim 10, wherein the second portion includes one or more fins, and the one or more fins extends parallel with or perpendicular to the longitudinal axis relative to the one or more openings. ### Claim 12 (depends on 10) The charger of claim 10, wherein each of the one or more openings has a width relative to the longitudinal axis, and wherein each width is different. ### Claim 13 (depends on 1) The charger of claim 1, further comprising a seal member positioned between the heat sink and an inner surface of the housing. ### Claim 14 A site light comprising: a main housing having a plurality of inner surfaces defining a first cavity; and a charger supported by the main housing and positioned within the first cavity, the charger including a charger housing having a plurality of inner surfaces defining a second cavity, one or more openings formed in the charger housing, the one or more openings fluidly communicating the second cavity with the first cavity, and a heat sink at least partially disposed in the charger housing and operable to dissipate heat produced in the charger housing, a first portion of the heat sink positioned in facing relationship with one of the inner surfaces of the charger housing, a second portion of the heat sink positioned in facing relationship with one of the inner surfaces of the main housing via the one or more openings such that the heat sink is at least partially exposed to the first cavity, the heat sink in heat transfer relationship with components of charger electronics of the charger. ### Claim 15 (depends on 14) The site light of claim 14, further comprising a printed circuit board having the charger electronics and positioned within the second cavity, and a fan supported by the charger housing, wherein the first portion of the heat sink is coupled to the printed circuit board, wherein the fan is positioned exterior to the charger housing and within the first cavity, and wherein the fan is operable to pass air over the second portion. ### Claim 16 (depends on 14) The site light of claim 14, wherein the first portion of the heat sink has a C-shape cross-sectional shape formed by a first section, a second section spaced from the first section, and an intermediate section extending therebetween, wherein the first section is couplable to a printed circuit board of the charger, and wherein the second portion extends from the second section toward the one or more openings. ### Claim 17 (depends on 14) The site light of claim 14, further comprising a seal disposed between the heat sink and the charger housing, the seal fluidly isolating the second cavity from the first cavity exterior to the second cavity. ### Claim 18 A site light comprising: a main housing having a plurality of inner surfaces defining a first cavity; and a charger supported by the main housing and positioned within the first cavity, the charger including a charger housing having a plurality of inner surfaces defining a second cavity, one or more openings formed in the charger housing, the one or more openings fluidly communicating the second cavity with the first cavity, a printed circuit board having charger electronics, the printed circuit board positioned within the second cavity, and a heat sink at least partially disposed in the charger housing and operable to dissipate heat produced in the charger housing, a first portion of the heat sink coupled to the printed circuit board and in heat transfer relationship with components of the charger electronics, the first portion positioned in facing relationship with one of the inner surfaces of the charger housing, a second portion of the heat sink extending from the first portion toward the one or more openings, the second portion positioned in facing relationship with one of the inner surfaces of the main housing via the one or more openings such that the heat sink is at least partially exposed to the first cavity. ### Claim 19 (depends on 18) The site light of claim 18, further comprising a fan supported by the charger housing, the fan positioned exterior to the charger housing and positioned within the first cavity, wherein the second portion of the heat sink includes one or more fins extending from the first portion toward the one or more openings, and wherein the fan is operable to pass air over the one or more fins of the second portion. ### Claim 20 (depends on 18) The site light of claim 18, wherein the first portion of the heat sink has a C-shape cross-sectional shape formed by a first section, a second section spaced from the first section, and an intermediate section extending therebetween, wherein the first section is coupled to the printed circuit board, and wherein the second portion extends from the second section toward the one or more openings. ### Claim 21 (depends on 18) The site light of claim 18, further comprising a seal disposed between the heat sink and the charger housing, the seal fluidly isolating the second cavity from the first cavity exterior to the second cavity. ### Claim 22 A power adapter assembly comprising: a power box including a housing defining an internal compartment, the power box including an electrical component received in the internal compartment; a heat sink positioned within the internal compartment and operable to dissipate heat produced by the electrical component, the heat sink having a U-shaped cross-section formed by a first leg, a second leg spaced from the first leg, and an intermediate leg extending therebetween, the first leg, the second leg, and the intermediate leg defining an air flow slot extending longitudinally along an axis through the heat sink, the heat sink positioned in heat transfer relationship with the electrical component; and an adapter electrically connectable to the power box, the adapter configured to supply power to an electrical device. ### Claim 23 (depends on 22) The power adapter assembly of claim 22, further comprising a printed circuit board having the electrical component, the printed circuit board positioned within the internal compartment, and wherein the heat sink is coupled to the printed circuit board. ### Claim 24 (depends on 23) The power adapter assembly of claim 23, wherein the intermediate leg of the heat sink is coupled to the printed circuit board. ### Claim 25 (depends on 22) The power adapter assembly of claim 22, further comprising one or more ribs extending from at least one of the first leg, the second leg, and the intermediate leg, wherein the one or more ribs is positioned within the air flow slot. ### Claim 26 (depends on 22) The power adapter assembly of claim 22, further comprising an air inlet positioned on one side of the power box, and an air outlet positioned on another side of the power box, and wherein air is configured to flow through the power box from the air inlet along the heat sink through the air flow slot to the air outlet. ### Claim 27 (depends on 26) The power adapter assembly of claim 26, wherein the heat sink extends between a first end and a second end, wherein the first end is adjacent and aligned with the air inlet, and wherein the second end is adjacent and aligned with the air outlet. ### Claim 28 (depends on 22) The power adapter assembly of claim 22, further comprising a fan positioned within the internal compartment, the fan operable to direct air along the heat sink and through the air flow slot. ### Claim 29 (depends on 28) The power adapter assembly of claim 28, wherein the fan is positioned between an air inlet of the power box and an end of the heat sink. ### Claim 30 (depends on 28) The power adapter assembly of claim 28, wherein the heat sink extends between a first end and a second end, wherein the fan includes a rotational axis, and wherein the rotational axis is aligned with the first end and the second end of the heat sink. ### Claim 31 (depends on 22) The power adapter assembly of claim 22, wherein the adapter is electrically connectable to the power box by a power cord, wherein the electrical device is a power tool, and wherein a power support portion of the power tool is configured to receive a pack engagement portion of a battery pack and the adapter. ### Claim 32 A power adapter assembly comprising: a power box including a housing defining an internal compartment, the power box including an electrical component received in the internal compartment; a heat sink positioned within the internal compartment and operable to dissipate heat produced by the electrical component, the heat sink having a body and a plurality of fins extending therefrom, the heat sink in heat transfer relationship with the electrical component; a case positioned within the internal compartment and positioned to surround the fins of the heat sink, the body of the heat sink positioned exterior to the case; and an adapter electrically connectable to the power box, the adapter configured to supply power to an electrical device. ### Claim 33 (depends on 32) The power adapter assembly of claim 32, further comprising a printed circuit board having the electrical component, the printed circuit board positioned within the internal compartment, and wherein at least one of the heat sink and the case is coupled to the printed circuit board. ### Claim 34 (depends on 33) The power adapter assembly of claim 33, wherein the case is formed by plastic. ### Claim 35 (depends on 32) The power adapter assembly of claim 32, wherein the body includes a side facing toward the case, wherein the plurality of fins extend from the side of the body toward an internal side of the case, and wherein each end of the plurality of fins is spaced from the internal side of the case. ### Claim 36 (depends on 32) The power adapter assembly of claim 32, further comprising an air inlet positioned on one side of the power box, and an air outlet positioned on another side of the power box, and wherein air is configured to flow through the case from the air inlet along the plurality of fins of the heat sink to the air outlet. ### Claim 37 (depends on 36) The power adapter assembly of claim 36, wherein the case extends between a first end and a second end, wherein the first end is adjacent and aligned with the air inlet, and wherein the second end is adjacent and aligned with the air outlet. ### Claim 38 (depends on 32) The power adapter assembly of claim 32, further comprising a fan positioned within the internal compartment, the fan operable to direct air through the case. ### Claim 39 (depends on 38) The power adapter assembly of claim 38, wherein the fan is positioned between an air inlet of the power box and an end of the case. ### Claim 40 (depends on 38) The power adapter assembly of claim 38, wherein the case extends between a first end and a second end, wherein the fan includes a rotational axis, and wherein the rotational axis is aligned with the first end and the second end of the case. ### Claim 41 (depends on 32) The power adapter assembly of claim 32, wherein the adapter is electrically connectable to the power box by a power cord, wherein the electrical device is a power tool, and wherein a power support portion of the power tool is configured to receive a pack engagement portion of a battery pack and the adapter.