Self-propelled, dust-collecting robot

• US 10,463,219 B2
• Filed: 08/27/2015
• Issued: 11/05/2019
• Est. Priority Date: 10/03/2014
• Status: Active Grant

• Current Assignee: Makita Corporation
• Original Assignee: Makita Corporation
• Inventors: Koura, Kentaro, Shinma, Yasutoshi
• Primary Examiner(s): Hunter, Sean K.
• Assistant Examiner(s): McConnell, Aaron R
• Application Number:
  US14/837,483
• Publication Number:
  US 20160095487A1
• Time in Patent Office: 1,531 Days
• CPC Class Codes: A47L 2201/00 Robotic cleaning machines, i.e. with automatic control of the travelling movement or the cleaning operation
• CPC Class Codes: A47L 9/1418 Impermeable dust collecting bags
• CPC Class Codes: A47L 9/2868 Arrangements for power supply of vacuum cleaners or the accessories thereof
• CPC Class Codes: A47L 9/2884 Details of arrangements of batteries or their installation

Abstract

A self-propelled, dust-collecting robot includes a chassis, an electric motor supported by the chassis, and first and second rechargeable battery packs disposed inside the chassis for supplying current to the electric motor. First and second castors are respectively disposed immediately underneath the first and second battery packs. Each of the battery packs has a pair of rails that respectively slide into and engage with complementary guide rails coupled to the chassis. A dust-collection box is removably disposed within the chassis. A dust-collection motor rotates a suction fan that is in fluid communication with the dust-collection box. At least one rotatable brush sweeps dust towards a suction port in fluid communication with the dust-collection box.

Claims

1. A self-propelled, dust-collecting robot, comprising:

a main-body part having a top, a bottom, an outer peripheral side connecting the top to the bottom, a first recess and a second recess, each of the first and second recesses extending into the top and into the outer peripheral side and respectively including first and second battery pack mounts respectively disposed on first and second radially exposed outwardly facing walls of the main-body part that are not parallel and are not coplanar, each of the first and second battery pack mounts including an electrical connector and a radially exposed pair of guide rails;

a dust-collection unit provided on the main-body part; and

a first battery pack releasably connected to the first battery pack mount and a second battery pack releasably connected to the second battery pack mount.

5. The self-propelled, dust-collecting robot according to claim 1, wherein:

the dust-collection unit comprises a dust-collection motor; and

the first and second battery packs are disposed such that they sandwich the dust-collection motor on the left and right thereof.

6. The self-propelled, dust-collecting robot according to claim 1, wherein the robot is an autonomous floor cleaning robot and includes an electric motor supported by the main body part and electrically connected to the first electrical connectors of the first and second battery pack mounts.

7. The self-propelled, dust-collecting robot according to claim 6, further comprising:

first and second castors respectively disposed immediately underneath the first and second battery packs.

8. The self-propelled, dust-collecting robot according to claim 7, wherein the first and second battery packs and the first and second castors are respectively disposed in a mirror-symmetric manner with respect to a center line extending in a front-rear direction of the robot.

9. The self-propelled, dust-collecting robot according to claim 8, wherein:

the first and second battery packs each comprise a case, a plurality of battery cells disposed within the case and a pair of parallel rails disposed on an exterior surface of the case; and

each of the first and second pair of guide rails is complementary to, and engages, the pair of parallel rails disposed on the respective battery pack case.

10. The self-propelled, dust-collecting robot according to claim 9, wherein:

each of the first and second battery packs has a pair of slits disposed in parallel between the pair of parallel rails and discharge terminals are respectively disposed within the slits; and

each of the electrical connectors of the first and second battery pack mounts has contact terminals configured to respectively slide into the slits and contact the discharge terminals when the first and second battery packs are respectively coupled to the first and second battery pack mounts.

13. The self-propelled, dust-collecting robot according to claim 1, wherein:

the first battery pack includes a first side and a second side opposite the first side, the first side of the first battery pack includes an electrical connector in contact with the electrical connector of the first battery pack mount and the second side of the first battery pack is radially spaced from the first side of the first battery pack and is located at a periphery of the main body part.

14. The self-propelled, dust-collecting robot according to claim 13, wherein the radially exposed outwardly facing walls face radially outwardly.

2. A self-propelled, dust-collecting robot, comprising:

a main-body part;

a dust-collection unit provided on the main-body part;

first and second pairs of guide rails respectively disposed on radially exposed outwardly facing walls of the main-body part that are not parallel and are not coplanar, first and second battery packs respectively coupled to the first and second pairs of guide rails; and

first and second castors provided in a lower part of the main-body part;

wherein the first and second castors are respectively disposed immediately below the first and second battery packs.

3. The self-propelled, dust-collecting robot according to claim 2, wherein the first and second battery packs are disposed at a rear part of the main-body part, and each of the first and second battery packs houses a plurality of battery cells inside a case.

4. The self-propelled, dust-collecting robot according to claim 3, wherein a central, rear portion of the main-body part has a first bottom surface that surrounds the first and second castors and extends to an outermost periphery of the central, rear portion of the main-body part such that the first bottom surface of the outermost periphery of the central, rear portion of the main-body part is higher than a second bottom surface of an outermost periphery of a central, front part of the main-body part.

15. The self-propelled, dust-collecting robot according to claim 3, wherein:

the first and second pairs of guide rails are configured to engage respective rails on the first and second battery packs, and the first and second guide rails are disposed in the rear part of the main-body part and extend perpendicular to a moving direction of the robot during a dust collecting operation.

16. The self-propelled, dust-collecting robot according to claim 15, wherein the first and second battery packs comprise lithium ion battery cells and have a nominal output voltage of 18-36 volts.

17. The self-propelled, dust-collecting robot according to claim 16, wherein the first and second guide rails are provided, in plan view, on the outer side of the main-body part and thus the battery packs are disposed at an outermost periphery of the central, rear portion of the main-body part.

11. A self-propelled, dust-collecting robot, comprising:

a housing having an interior, a bottom wall, and a front wall portion spaced from a rear wall portion in a first direction;

a first drive wheel;

a second drive wheel spaced from the first drive wheel in a second direction perpendicular to the first direction, the first drive wheel and the second drive wheel being supported by the housing and being rotatable around a drive wheel axis of rotation;

a dust-collecting opening extending through the bottom wall between the axis of rotation and the front wall portion;

a vacuum unit having a dust-collection motor inside the housing connected to the dust-collecting opening and configured to draw dust into the dust-collecting opening;

a first castor and a second castor disposed between the drive wheel axis of rotation and the rear wall portion; and

a first battery and a second battery respectively mounted on first and second pairs of guide rails that extend on the housing in a third direction perpendicular to the first direction and to the second direction such that the first and second batteries sandwich the dust-collection motor in the second direction and are removable from the guide rails in the third direction;

wherein each of the first and second castors respectively includes a castor wheel that is rotatable about an axle axis of an axle, and a support shaft attached to the housing and defining a pivot axis that is at least substantially perpendicular to the axle axis, each of the castor wheels being pivotable about the respective pivot axis;

at least a portion of the first castor is located directly beneath the first battery and at least a portion of the second castor is located directly beneath the second battery; and

the first and second pairs of guide rails are respectively disposed on radially exposed outwardly facing walls of the main-body part that are not parallel and are not coplanar.

12. The self-propelled dust-collecting robot according to claim 11, wherein the pivot axis of the first castor passes through the first battery, the pivot axis of the second castor passes through the second battery and the pivot axes extend parallel to the guide rails.

18. The self-propelled, dust-collecting robot according to claim 12, wherein:

the first and second battery packs comprise lithium ion battery cells and have a nominal output voltage of 18-36 volts; and

the guide rails are provided, in plan view, on an outermost periphery of a filter box of the vacuum unit.