Power-operated device with a cooling facility

• US 4,847,513 A
• Filed: 02/26/1988
• Issued: 07/11/1989
• Est. Priority Date: 02/26/1988
• Status: Expired due to Term

• Current Assignee: Black & Decker Incorporated (Stanley Black & Decker, Inc.)
• Original Assignee: Black & Decker Incorporated (Stanley Black & Decker, Inc.)
• Inventors: Katz, Friedrich J., Abbratozzato, Salvatore R.
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): Ip, Paul
• Application Number:
  US07/160,908
• Time in Patent Office: 501 Days
• Field of Search: 307/149, 307/150, 307/151, 307/64, 307/66, 30/376, 30/391, 30/388, 30/166 R, 30/165, 30/DIG. 1, 363/21, 363/97, 363/17, 363/98, 323/285, 323/3, 320/2, 142/26, 142/39, 142/40, 144/222
• US Class Current: 307/149
• CPC Class Codes: B23D 47/12 of drives for circular saw blades
• CPC Class Codes: B23Q 1/0009 Energy-transferring means or control lines for movable machine parts; Control panels or boxes; Control parts control handles for driving or feeding mechanisms B23Q5/54
• CPC Class Codes: H01H 2009/065 Battery operated hand tools in which the battery and the switch are directly connected
• CPC Class Codes: H01H 9/06 Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner
• CPC Class Codes: H01H 9/52 Cooling of switch parts cooling of contacts H01H1/62
• CPC Class Codes: H01M 50/247 specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H02K 23/66 Structural association with auxiliary electric devices influencing the characteristic of, or controlling, the machine, e.g. with impedances or switches
• CPC Class Codes: H02K 7/145 Hand-held machine tool
• CPC Class Codes: H02K 9/04 having means for generating a flow of cooling medium
• CPC Class Codes: H02M 3/33571 Half-bridge at primary side of an isolation transformer
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10S 30/01 Rechargeable battery operated

Abstract

A cordless power-operated device, such as a saw 20, is powered by a low level D.C. voltage provided by battery pack cells to operate the saw in a cordless mode. The cells are housed in a container 32 which fits into a cavity 23 formed in a housing 22 of saw 20. Another container 66 includes a first section 64 which is shaped externally in the same configuration as container 32. First section 64 houses a voltage converter 62 which converts conventional A.C. voltage, such as 120 volts at 60 Hz, to the low level D.C. voltage required to operate saw 20. Container 66 can be inserted into cavity 23 of saw 20 and voltage converter 62 can be connected to a conventional A.C. source to operate the saw in a corded mode. Container 66 also includes a second section 68 which houses a cooling motor 70. Cooling motor 70 provides powered cooling of saw motor 28, the cooling motor and voltage converter 62.

Claims

1. A power-operated device having a powered driver operable at a prescribed voltage level, which comprises:

means for developing operating power at the prescribed voltage level;

means for cooling the powered driver;

means for containing the developing means and the cooling means together; and

means for supporting the containing means in position with the powered driver to facilitate the application of the operating power to and the cooling of the powered driver.

2. The power-operated device as set forth in claim 1, which further comprises:

means for applying the operating power of the developing means at the prescribed voltage level to the power driver and the cooling means.

3. The power-operated device as set forth in claim 1, which further comprises:

means for connecting the operating power developing means to an external power source to facilitate operation of the operating power developing means.

4. A power-operated device having a motor operable at a prescribed voltage level, which comprises:

a housing for containing the motor and formed with a cavity therein;

means for developing operating power at the prescribed voltage level;

means for cooling the motor;

means for containing together the developing means and the cooling means;

the containing means configured externally to fit into the cavity;

means for connecting the developing means to the motor and the cooling means to provide operating power thereto, and

means for connecting the developing means to an external power source to facilitate operation of the developing means.

11. The power-operated device as set forth in claim 4 wherein the developing means operates in a power output range of 50 watts and higher.

5. A power-operated device having a drive motor operable at a prescribed voltage level normally associated with a cordless mode of operation which comprises:

a housing formed with a motor chamber for containing the drive motor and formed with a cavity therein configured for receipt of a container which houses a cordless-mode power source;

means for developing operating power at the prescribed voltage level;

means for cooling the motor;

means for containing together the developing means and the cooling means;

the containing means configured to fit into the cavity interchangeably with the cordless-mode container;

means for connecting the developing means to the motor and to the cooling means to provide operating power thereto, and

means for connecting the developing means to an external power source to facilitate operation of the developing means.

6. The power-operated device as set forth in claim 5 wherein the cooling means cools the operating power developing means.

7. The power-operated device as set forth in claim 5, wherein the cooling means includes:

means formed in the housing for facilitating the movement of a cooling medium through the motor chamber;

means formed in the containing means for facilitating the movement of the cooling medium through the containing means, and

means formed in the housing for facilitating the movement of the cooling medium between the motor chamber and the containing means to thereby permit cooling of the drive motor.

8. The power-operated device as set forth in claim 5, wherein the cooling means includes:

cooling medium portals formed in spaced portions of the containing means to permit the passage of the cooling medium therethrough;

cooling medium portals formed in spaced portions of the motor chamber to permit the passage of the cooling medium therethrough, and

means for locating at least one cooling medium portal of the containing means in alignment with at least one cooling medium portal of the motor 12 chamber to permit the passage of the cooling medium therethrough.

9. The power-operated device as set forth in claim 5 wherein the cooling means includes:

a cooling motor, and

a fan cage operated by the cooling motor.

10. The power-operated device as set forth in claim 9 wherein the fan cage is positioned about the exterior of the cooling motor.

12. The power-operated device as set forth in claim 5 wherein the voltage supply level is in a range of 3.6 volts to 48 volts D.C.

13. The power-operated device as set forth in claim 5, which further comprises means located on the exterior of the housing for securing the containing means within the cavity of the housing.

14. The power-operated device as set forth in claim 5 wherein the developing means includes:

means for converting voltage of the external power source to a high frequency A.C. voltage;

means for transforming the high frequency A.C. voltage to a low level A.C. voltage, and

means for rectifying the low level A C. voltage to a D.C. voltage level equal to the prescribed voltage level of the drive motor.

15. A power-operated device having a drive motor, which comprises:

a housing formed with a motor chamber, a cavity and a portal between the motor chamber and the cavity;

means for developing operating power at a predetermined voltage level;

a cooling motor operable at the predetermined voltage level;

a fan cage attached to and operable by the cooling motor;

a container for supporting the operating power developing means, the cooling motor and the fan cage;

the container formed with a portal and configured to be insertable within the cavity with the container portal aligned with the housing portal, and

means for applying the operating power of the developing means to the cooling motor to facilitate the movement of a cooling medium about the drive motor.

16. The power-operated device as set forth in claim 15, which further comprises:

the drive motor being operable at the predetermined voltage level, and

means for applying the operating power of the developing means to the drive motor.

17. The power-operated device as set forth in claim 15 which further comprises:

a shaft extending from the cooling motor, and

the fan cage mounted on the shaft and extending toward and about the drive motor.