EP2594801B1

EP2594801B1 - Rechargeable battery powered utility pump with series centrifugal pump configuration

Info

Publication number: EP2594801B1
Application number: EP12193034.1A
Authority: EP
Inventors: Humberto V. Meza; Randall H. Moormann; Mark F. Ingersoll; Jeffrey B. Schopperle; Joel A. Kenney
Original assignee: Flow Control LLC
Current assignee: Flow Control LLC
Priority date: 2011-11-18
Filing date: 2012-11-16
Publication date: 2017-10-11
Anticipated expiration: 2032-11-16
Also published as: AU2012254972A8; DK2594801T3; NZ603709A; AU2012254972B8; EP2594801A3; CA2795964C; CA2795964A1; CN103133357A; EP2594801A2; AU2012254972A1; MX2012013390A; CN103133357B; AU2012254972B2

Description

BACKGROUND OF THE INVENTION

The present invention relates to a pump; and more particularly a rechargeable portable utility pump.

SUMMARY OF THE INVENTION

The present invention provides a utility pump featuring a new and unique combination of a housing and a battery. According to the present invention, the housing is configured with a series configuration of integral pumps, and also configured with a battery receiving portion having electrical terminals for receiving power for providing to the series configuration of the integral pumps; and the battery includes a protruding body with corresponding electrical terminals configured to contact the electrical terminals of the battery receiving portion to provide power to the series configuration of the integral pumps when the protruding body of the battery is inserted into the battery receiving portion of the housing and rotated in one direction to an "ON" position, and also configured so as not to contact the electrical terminals when the battery is not rotated to the "ON" position.
According to some embodiments of the present invention, the utility pump may also include one or more of the following features:

The series configuration of the integral pumps may include a first centrifugal pump and a second centrifugal pump.

A suction side of the first centrifugal pump may be configured to receive a fluid through a lower strainer unit, and/or a discharge of the first centrifugal pump may be configured to be directly integrated into a corresponding suction side of the second centrifugal pump so that the fluid is then discharged out the second centrifugal pump through a fitting.
The utility pump may include a rechargeable battery pack and printed circuit board (PCB) controls that are housed inside a thermoplastic assembly or housing.
The protruding body of the battery may also include a cylindrical wall with an O-ring configured to frictionally engage and make sealing contact with an internal wall of the battery receiving portion to prevent the fluid from contacting the electrical terminals and the corresponding electrical terminals when the battery is inserted into the battery receiving portion, so that the utility pump may be operated when either partially and totally submersed in the fluid. According to the present invention, the battery receiving portion includes an internal wall configured with at least one axial channel therein; and the protruding body of the battery includes an external wall having at least one protruding portion configured to engage the at least one axial channel for guiding and orienting the battery when inserted into the battery receiving portion in a first rotational position.
The internal wall of the battery receiving portion is also configured with at least one partial circumferential channel; and the at least one protruding portion is also configured to engage the partial circumferential channel for rotating the battery from the first rotational position when the protruding body of the battery is inserted into the battery receiving portion of the housing into either a second rotational position, including the "ON" position where the series configuration of integral pumps is turned "ON", or to a third rotational position, including the "OFF" position where the series configuration of the integral pumps is turned "OFF."
The at least one axial channel may also include two axial channels disposed on opposite sides of the battery receiving portion, and the at least partial circumferential channel may also include two partial circumferential channels; and the external wall of the protruding body of the battery may include two protruding portions configured to engage respectively the two axial channels for guiding and orienting the battery when inserted into the battery receiving portion, and also to engage the two partial circumferential channel for positioning the battery in either the second rotational position ("ON") or the third rotational position ("OFF").
The two axial channels may be configured and dimensioned with different sizes, and the two protruding portions may be configured and dimensioned with corresponding different sizes, so that the battery can only be inserted into the battery receiving portion with one orientation.
The at least one partial circumferential channel may include a flexible locking device having a first face and a second face and being configured on a flexible hinge portion. The first face may be configured on an angle so as to respond to the at least one protruding portion and flex the flexible locking device downwardly into an opening or slot and below the channel surface so as to allow the at least one protruding portion to slide or pass by when the battery is rotated in the one direction in the battery receiving portion. The flexible locking device may be configured to flex back upwardly above the channel surface once the at least one protruding portion slides or passes by the first face. The second face may be configured to extend into the partial circumferential channel above the channel surface so as to prevent the at least one protruding portion from passing or sliding by when the battery is rotated in an opposite direction in the battery receiving portion so as to lock the battery in the battery receiving portion so it cannot be removed.
The housing may also include a switch configured to respond to a switching actuation and move the flexible locking device downwardly into the opening or slot and below the channel surface to allow the at least one protruding portion to pass by when the battery is rotated in the opposite direction in the battery receiving portion, so that the battery may be moved to the first rotational position and removed from the battery receiving portion.
The battery receiving portion may also be configured with a flat wall having the electrical terminals arranged thereon; and the protruding body of the battery may also be configured with a corresponding flat wall having the corresponding electrical terminals arranged thereon for contacting the electrical terminals when the battery is inserted into the battery receiving portion and rotated.
The housing may also have a detachable two-part construction, including a lower part configured with openings to receive fluid to be pumped, and an upper part configured with an outlet port for providing the fluid being pumped.
The battery may be a rechargeable battery.
The battery may also include a cover position having an arrow-shaped member configured to provide a visual indication of the orientation of the battery.

BRIEF DESCRIPTION OF THE DRAWING

The drawing, which is not necessarily drawn to scale, includes the following Figures:

Figure 1 is a top perspective view of a portable bilge pump according to some embodiments of the present invention;
Figure 2 is a front view of the portable bilge pump shown in Figure 1 with the battery inserted, according to some embodiments of the present invention;
Figure 3 is a front view of the portable bilge pump shown in Figure 1 without the battery inserted, according to some embodiments of the present invention;
Figure 4 is a side view of the portable bilge pump shown in Figure 1 according to some embodiments of the present invention;
Figure 5 is a partial perspective view of the portable bilge pump shown in Figure 3 according to some embodiments of the present invention;
Figure 6 is a side view of a battery that forms part of the portable bilge pump shown in Figure 1 according to some embodiments of the present invention;
Figure 7 is a back view of the battery shown in Figure 6 according to some embodiments of the present invention; and
Figure 8 is a perspective view of the battery shown in Figure 6 according to some embodiments of the present invention.
Figures 9a, 9b show a utility pump according to some embodiments of the present invention, where Figure 9a is an isometric view of the utility pump, and Figure 9b is a cross-sectional view of the utility pump shown in Figure 9a.

DETAILED DESCRIPTION OF THE INVENTION

Figures 1-8 show a pump generally indicated as 10 that features a new and unique combination, arrangement or configuration of a housing 12 and a battery 14, including a rechargeable battery. As shown by way of example in Figures 3 and 5, the housing 12 may be configured with a battery receiving portion generally indicated as 16 having electrical terminals 18a, 18b for receiving power to the pump 10. The battery receiving portion 16 is configured or formed as a cavity in part of the housing 12 that is dimensioned to receive some portion of the battery 14, consistent with that described herein.
As shown by way of example in Figures 6-8, the battery 14 may include a protruding body 20 with corresponding electrical terminals 22a, 22b configured to contact the electrical terminals 18a, 18b of the battery receiving portion 16 to provide power to the pump 10 when the protruding body 20 of the battery 14 is inserted into the battery receiving portion 16 of the housing 12 as shown in Figure 2 and rotated in one direction indicated by arrow A (Figure 2) to an "ON" position, and also configured so as not to contact the electrical terminals when the battery 14 is not rotated to the "ON" position. The battery 14 is not rotated to the "ON" position when it is any other rotational position other than in the "ON" position, e.g., including when it is in a battery insert position generally indicated by reference label I in Figures 2-3, and also including when it is in the "OFF" position.
As shown by way of example in Figure 6, the protruding body 20 may also include a cylindrical wall 24 with an O-ring 26 configured to frictionally engage and make sealing contact with one cylindrical internal wall 28 of the battery receiving portion 16 as shown in Figures 3 and 5 to prevent the fluid from contacting the electrical terminals 18a, 18b (Figure 3) and the corresponding electrical terminals 22a, 22b (Figure 7) when the battery 14 is inserted into the battery receiving portion 16 as shown in Figure 2, so that the pump 10 may be operated when either partially and totally submersed in the fluid. The configuration of the cylindrical wall 24 and O-ring 26 includes the cylindrical wall 24 having an annular channel or groove for receiving and retaining the O-ring 26 therein, as well as embodiments in which the O-ring 26 is arranged on the cylindrical wall 24 without using an annular channel or groove.
As shown by way of example in Figures 3 and 5, the battery receiving portion 16 may include another internal wall 30a configured with at least one axial channel 32a, 32b formed therein. As shown in Figures 6-8, the protruding body 20 of the battery may include at least one external wall 34a, 34b with at least one protruding portion 36a, 36b configured to engage the at least one axial channel 32a, 3ab for guiding and orienting the battery 14 when inserted into the battery receiving portion 16 as shown in Figure 2 in a first rotational position as indicated by reference label I in Figures 2-3.
As shown by way of example in Figure 5, the internal wall 30a of the battery receiving portion 16 may also be configured with at least one partial circumferential channel 38 that is formed between the internal wall 30a and a corresponding internal wall 30b. The at least one protruding portion 36a shown in Figures 6-8 may also be configured to engage the partial circumferential channel 38 shown in Figure 5 for rotating the battery 14 from the first rotation position I (Figures 2-3) when the protruding body 20 of the battery 14 is inserted into the battery receiving portion 16 of the housing 12 as shown in Figure 2 into either a second rotational position, such as the "ON" position where the pump is turned "ON", or to a third rotational position, such as the "OFF" position where the pump is turned "OFF", as shown in Figure 2
As shown by way of example in Figures 3 and 5, the two axial channels 32a, 32b are configured, disposed, arranged or formed on opposite sides of the battery receiving portion 16. In embodiments having two protruding portions 36a, 36b (Figures 6-8), the at least partial circumferential channel 38 may include a second partial circumferential channel for receiving the corresponding protruding portion 36b. The second partial circumferential channel is not shown in Figure 5, but is understood to be configured substantially similar to the partial circumferential channel 38 and dimensioned to receive the protruding portion 36b. Embodiments are envisioned using one protruding portion, e.g., element 36a, so that one corresponding circumferential channel, e.g., element 38, may be formed in the battery receiving portion 16 for receiving the same. In operation, when inserted into the battery receiving portion 16 the two corresponding protruding portions 36a, 36b are configured to engage respectively the two axial channels 32a, 32b for guiding and orienting the battery 14 in the battery receiving portion 16; and the two corresponding protruding portions 36a, 36b are also configured to engage the two partial circumferential channels 38 for rotating and positioning the battery 14 in some other rotational position, including either the second rotational position (i.e. the "ON" position) or the third rotational position (i.e. the "OFF" position), as shown in Figures 2-3.
As shown by way of example in Figures 3 and 5 and Figures 6-8, the two axial channels 32a, 32b may be configured and dimensioned with different sizes, and the two protruding portions 36a, 36b may also be configured and dimensioned with corresponding different sizes, so that the battery 14 can only be inserted into the battery receiving portion 16 with one orientation, i.e. the larger protruding portion 36a is received by the larger dimensioned axial channel 32a and the smaller protruding portion 36b is received by the smaller dimensioned axial channel 32b, as shown in Figures 3 and 5-7. The scope of the invention is not intended to be limited to any particular dimension or size of the axial channels 32a, 32b or protruding portions 36a, 36b in relation to one another or each other.
As shown by way of example in Figure 5, the at least one partial circumferential channel 38 may also include a flexible locking device 40 having a first face 40a and a second face 40b and being configured on a flexible hinge portion 42. The first face 40a is configured on an angle so as to respond to the at least one protruding portion 36a and flex the flexible locking device 40 downwardly into an opening or slot 44 and below the channel surface so as to allow the at least one protruding portion 36a to slide or pass by when the battery 14 is rotated in the one direction A (see Figure 2) in the battery receiving portion 16. Once the at least one protruding portion 36a has slid and passed by the first face 40a when the battery 14 is rotated in the one direction A (Figure 2), the flexible locking device 40 is configured to flex back upwardly above the channel surface. In this position, the second face 40b is configured to extend into the partial circumferential channel 38 so as to prevent the at least one protruding portion 36a from passing or sliding by when the battery 14 is rotated in an opposite direction B (see Figure 2) in the battery receiving portion 16 so as to lock the battery 14 in the battery receiving portion 16 so it cannot be removed.
As shown by way of example in Figures 1-3, the housing 12 may also include a switch or button 50 configured to respond to a switching actuation, e.g., by a user pressing the button, and move the flexible locking device 40 downwardly so the second face 40b is below the channel surface to allow the at least one protruding portion 36a to pass by when the battery 14 is rotated in the opposite direction B (Figure 2) in the battery receiving portion 16, so that the battery 14 may be moved to the first rotational position I (Figure 2) and removed from the battery receiving portion 16. The scope of the invention is not intended to be limited to the type or kind of coupling between the switch 50 and the flexible locking device 40, and a person skilled in the art would be able to implement such a coupling without undue experimentation. By way of example, such a coupling may include an embodiment in which the switch or button 50 is pressed inwardly by a user so the flexible locking device 40 moves downwardly below the channel surface and stays in place until the switch or button 50 is pressed a second time to release the flexible locking device 40 and moves upwardly above the channel surface. Alternatively, such a coupling may include an embodiment in which the switch or button 50 may be pressed inwardly by the user and held by the user so the flexible locking device 40 moves downwardly below the channel surface and stays in place until the switch or button 50 is released by the user such that the flexible locking device 40 moves upwardly back above the channel surface.
As shown by way of example in Figure 3, the battery receiving portion 16 may also be configured with a flat wall 60 having the electrical terminals 18a, 18b arranged thereon. As shown in Figures 6-8, the protruding body 20 of the battery may also be configured with a corresponding flat wall 62 having the corresponding electrical terminals 22a, 22b arranged thereon for contacting the electrical terminals 18a, 18b when the battery 14 is inserted into the battery receiving portion 16 and rotated. Embodiment are also envisioned in which the electrical terminals 18a, 18b (Figure 3) may be arranged on the cylindrical internal wall 28 and the corresponding electrical terminals 22a, 22b (Figures 6-8) may be arranged on the cylindrical wall 24 so as to make electrical contact when the protruding body 20 of the battery is inserted into the battery receiving portion 16 of the housing 12 and suitably rotated to the "ON" position. Embodiment are also envisioned where one electrical terminal may be arranged on a flat wall and the other electrical terminal may be arranged on a cylindrical wall, and where one corresponding electrical terminal may be arranged on a corresponding flat wall and the other corresponding electrical terminal may be arranged on a corresponding cylindrical wall, so as to make electrical contact when the protruding body 20 of the battery is inserted into the battery receiving portion 16 of the housing 12 and suitably rotated to the "ON" position.
As shown by way of example in Figures 2, 4 and 6, the battery 14 may be configured with a cover portion 90 having an arrow-shaped member 92 configured to provide a visual indication of the orientation of the battery 14. For example, when the battery 14 inserted in the battery receiving portion 16, the arrow-shaped member 92 would be pointed to the reference label I in Figure 2; when the battery 14 is rotated to the "ON" position in the battery receiving portion 16, the arrow-shaped member 92 would be pointed to the reference label "ON" in Figure 2; and when the battery 14 is rotated to the "OFF" position in the battery receiving portion 16, the arrow-shaped member 92 would be pointed to the reference label "OFF" in Figure 2.
As shown by way of example in Figures 1-5, the housing 12 may be configured as a detachable two-part construction, including a lower part 70 configured with openings 72 to receive fluid to be pumped, and an upper part 80 configured with an outlet port 82 for providing the fluid being pumped. The lower part 70 has tabs 74 (Figure 1) and 76 (Figure 4) that are configured to be received in corresponding openings 84 (Figure 1) and 86 (Figure 4) of the upper part 80 and pressed, e.g., by fingers of a user, to detach and release the lower part 70 from the upper part 80. The lower part 70 is also configured with recesses 78a (Figure 1) and 78b (Figure 4) to be engaged, e.g., with the other fingers of the user, when detaching the lower part 70 and the upper part 80. Embodiments are also envisioned in which the pump 10 is assembled and the two parts 70, 80 of the housing 12 are sealed together, e.g., using an ultrasonic sealing or welding. The housing 12 may also be configured with a handle 100 as shown in Figures 1-4 for portably carrying the pump 10.
It is understood that the pump 10 is configured to contain some kind of pumping device (not shown) inside the housing 10. Pumping devices are known in the art and the scope of the invention is not intended to be limited to any particular type, kind or implementation thereof either now known or later developed in the future, including by way of example, a diaphragm pump, provided the pumping device is a series configuration of integral pumps as specified in claim 1. The pumping device itself does not form part of the underlying invention, and thus is not shown or described in detail. Moreover, consistent with that disclosed herein, a person skilled in the art would be able to implement such a pumping device, e.g., a diaphragm pump, into the housing 12 without undue experimentation within the scope of the claimed invention in order to make the pump 10 receive the fluid in the openings 72 (Figures 1-4) and provide the fluid from the port 82 (Figures 1 and 4).

Figures 9a, 9b: Series Centrifugal Pump Configuration

Figures 9a, 9b shows a utility pump generally indicated as 200. Similar elements in Figures 1-8 and Figure 9 are provided with similar reference numerals for the sake of consistency. So as to not unduly clutter Figure 9, not every element in Figure 9 is provided a reference numeral consistent with Figures 108.
The utility pump comprises a series configuration of two centrifugal pumps 202, 204 that gives an increase in the head pressure and is integral package within the pump housing 12.
The utility pump or pump system 200 comprises of an internal "hydraulics" assembly which includes the two centrifugal pumps 202, 204. The suction side of the first centrifugal pump 202 receives water through a lower strainer unit or openings 72. The discharge of the first pump 202 is directly integrated into the suction side of the second centrifugal pump 204. The fluid is then discharged out the second pump through a fitting 204b for providing out a discharge 206 (Figure 9a). This hydraulic unit along with the rechargeable battery pack 14 and printed circuit board (PCB) controls are housed inside a thermoplastic assembly or pump housing 12.
In Figure 9, the utility pump 200 is designed to meet consumer pumping needs for applications which AC or other DC power may not be readily available or convenient for use.
In Figure 9a, the utility pump 200 includes a battery assembly release button 210 that may be pressed in order to allow the battery 14 to be rotated and removed from the housing 12. See the switch or button 50 shown in Figures 1-3.
The utility pump 200 also includes pump legs 212a, 212b, 212c, and 212d for supporting and stabilizing the utility pump 200.

The Scope of the Invention

Further still, the embodiments shown and described in detail herein are provided by way of example only; and the scope of the invention is not intended to be limited to the particular configurations, dimensionalities, and/or design details of these parts or elements included herein. In other words, a person skilled in the art would appreciate that design changes to these embodiments may be made and such that the resulting embodiments would be different than the embodiments disclosed herein, but would still be within the scope of the invention as defined by the appended claims. Also, the drawings herein are not necessarily drawn to scale.

Claims

A utility pump (10; 200) comprising:
a housing (12) configured with a series configuration of integral pumps, and also configured with a battery receiving portion (16) having electrical terminals (18a, 18b) for receiving power for providing to the series configuration of the integral pumps, and a battery (14), characterized in that the battery (14) has a protruding body (20) with corresponding electrical terminals (22a, 22b) configured to contact the electrical terminals (18a, 18b) on the battery receiving portion (16) to provide the power to the series configuration of integral pumps when the protruding body (20) of the battery (14) is inserted into the battery receiving portion (16) of the housing (12) and rotated in one direction (A) to an "ON" position, and also configured so as not to contact the electrical terminals (18a, 18b) when the battery (14) is not rotated to the "ON" position,

wherein the battery receiving portion (16) has an internal wall (30a) configured with at least one axial channel (32a, 32b) therein; and the protruding body (20) of the battery (14) has an external wall (34a; 34b) having at least one protruding portion (36a, 36b) configured to engage the at least one axial channel (32a, 32b) for guiding and orienting the battery (14) when inserted into the battery receiving portion (16) in a first rotational position (I); and

wherein the internal wall (30a) of the battery receiving portion (16) is configured with at least one partial circumferential channel (38); and the at least one protruding portion (36a, 36b) of the battery (14) is configured to engage the at least one partial circumferential channel (38) for rotating the battery (14) from the first rotational position (I) when the protruding body (20) of the battery (14) is inserted into the battery receiving portion (16) of the housing (12) into either a second rotational position, including the "ON" position where the utility pump (10; 200) is turned "ON", or to a third rotational position, including the "OFF" position where the utility pump (10; 200) is turned "OF".
A utility pump (10; 200) according to claim 1, wherein the protruding body (20) of the battery has a cylindrical wall (24) with an O-ring (26) configured to frictionally engage and make sealing contact with an internal wall (28) of the battery receiving portion (16) to prevent the fluid from contacting the electrical terminals (18a, 18b) and the corresponding electrical terminals (22a, 22b) when the battery (14) is inserted into the battery receiving portion (16), so that the utility pump (10; 200) may be operated when either partially and totally submerged in the fluid.
A utility pump (10; 200) according to claim 1 or 2, wherein
the at least one axial channel comprises two axial channels (32a, 32b) disposed on opposite sides of the battery receiving portion (16), and the at least one partial circumferential channel (38) comprises two partial circumferential channels; and
the external wall (34a; 34b) of the protruding body (20) includes two protruding portions (36a, 36b) configured to engage respectively the two axial channels (32a, 32b) for guiding and orienting the battery (14) when inserted into the battery receiving portion (16), and to engage the two partial circumferential channel (38) for positioning the battery (14) in either the second rotational position or the third rotational position.
A utility pump (10; 200) according to claim 3, wherein
the two axial channels (32a, 32b) are configured and dimensioned with different sizes, and the two protruding portions (36a, 36b) configured and dimensioned with corresponding different sizes, so that the battery (14) can only be inserted into the battery receiving portion (16) with one orientation.
A utility pump (10; 200) according to claims 1 to 4, wherein
the at least one partial circumferential channel (38) has a flexible locking device (40) having a first face (40a) and a second face (40b) that is configured on a flexible hinge portion (42);
the first face (40a) is configured on an angle so as to respond to the at least one protruding portion (36a) and flex the flexible locking device (40) downwardly into an opening or slot (44) and below the channel surface so as to allow the at least one protruding portion (36a) to slide or pass by when the battery (14) is rotated in the one direction (A) in the battery receiving portion (16);
the flexible locking device (40) is configured to flex back upwardly above the channel surface once the at least one protruding portion (36a) slides or passes by the first face (40a); and
the second face (40b) is configured to extend into the partial circumferential channel (38) above the channel surface so as to prevent the at least one protruding portion (36a) from passing or sliding by when the battery (14) is rotated in an opposite direction (B) in the battery receiving portion (16) so as to lock the battery (14) in the battery receiving portion (16) so it cannot be removed.
A utility pump (10; 200) according to claim 5, wherein the housing (12) has a switch (50) configured to respond to a switching actuation and move the flexible locking device (40) downwardly into the opening or slot (44) and below the channel surface to allow the at least one protruding portion (36a) to pass by when the battery (14) is rotated in the opposite direction (B) in the battery receiving portion (16), so that the battery (14) may be moved to the first rotational position (I) and removed from the battery receiving portion (16).
A utility pump (10; 200) according to any of the preceding claims, wherein
the battery receiving portion (16) is configured with a flat wall (60) having the electrical terminals (18a, 18b) arranged thereon; and
the protruding body (20) is configured with a corresponding flat wall (62) having the corresponding electrical terminals (22a, 22b) arranged thereon for contacting the electrical terminals (18a, 18b) when the battery (14) is inserted into the battery receiving portion (16) and rotated.
A utility pump (10; 200) according to any of the preceding claims, wherein the housing (12) has a detachable two-part construction, including a lower part (70) configured with openings (72) to receive fluid being pumped, and an upper part (80) configured with an outlet port (82) for providing the fluid being pumped.
A utility pump (10; 200) according to any of the preceding claims, wherein the battery (14) is rechargeable.
A utility pump (10; 200) according to any of the preceding claims, wherein the battery (14) has a cover position (90) having an arrow-shaped member (92) configured to provide a visual indication of the orientation of the battery (14).
A utility pump (200) according to any of the preceding claims, wherein the series configuration of the integral pumps comprises a first centrifugal pump (202) and a second centrifugal pump (204).
A utility pump (200) according to claim 11, wherein
a suction side of the first centrifugal pump (202) is configured to receive a fluid through a lower strainer unit (72); and
a discharge of the first centrifugal pump (202) is configured to be directly integrated into a corresponding suction side of the second centrifugal pump (204) so that the fluid is then discharged out the second centrifugal pump through a fitting (204b).
A utility pump (200) according to claim 12, wherein the utility pump (200) comprises a rechargeable battery pack (14) and printed circuit board (PCB) controls that are housed inside the housing (12).