Handheld blower

Patent metadata

Field	Value
Publication number	US-9603497-B2
Application number	US-201314034064-A
Country	US
Kind code	B2
Filing date	Sep 23, 2013
Priority date	Feb 20, 2013
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A handheld blower includes a housing having an air inlet and a duct assembly mounted in front of the air inlet, the duct assembly including a duct connected with the housing, a motor and a fan mounted in the duct, a battery, and a blowpipe connected to the housing by the duct assembly, the blowpipe defining a central axis in the length direction, and a handle arranged above the housing and the battery. The handle includes a gripping portion arranged on opposite sides of a plane in which the gravity center of the blower is located, and the plane is parallel to a central axis of the blowpipe and substantially perpendicular to a working ground. The gravity center of the handheld blower is adjacent to the gripping portion which enhances the handling comfort and reduces operator fatigue during long times of operation.

First claim

What is claimed is:

1. A handheld blower, comprising:
a housing having an air inlet and a duct assembly mounted in front of the air inlet, the duct assembly comprising a duct connected with the housing, a motor and a fan mounted in the duct;
a battery mounted on the housing providing power to the motor;
a blowpipe connected to the housing by the duct assembly, the blowpipe defining a central axis in the length direction; and
a handle arranged above the housing and the battery, the handle comprising a gripping portion arranged on opposite sides of a plane in which the gravity center of the whole blower is located, the plane being parallel to a central axis defined on the blowpipe and substantially perpendicular to a working ground;
the housing having an accommodating chamber and a bending portion for turning airflow, the handle arranged on the bending portion of the housing; and
the handle comprising a battery mounting portion on which a battery mounting assembly is provided for installing or uninstalling the battery, the battery having a first end positioned adjacent to the housing and a second end opposite to the first end, wherein the second end is higher than the first end in a vertical direction orthogonal to the central axis within the plane,
the duct further comprising a supporting ring for accommodating the motor, and a plurality of radial air guiding ribs arranged between the duct and the supporting ring, and at least one of the air guiding ribs defines a channel for wires coupled to the motor to pass therethrough.

2. The handheld blower according to claim 1 , wherein the gripping portion is symmetrically arranged on opposite sides of the plane and the housing, the duct assembly and the blowpipe are substantially arranged along a same line.

3. The handheld blower according to claim 2 , wherein the air inlet comprises a main air inlet, a secondary air inlet and a side air inlet, the main air inlet and the secondary air inlet are arranged on the bottom of the housing, and the side air inlet is arranged on the side wall of the housing.

4. The handheld blower according to claim 3 , further comprising an air intake box arranged in the accommodating chamber of the housing, the air intake box being connected with the duct assembly to form an independent working unit, the air intake box comprising a bottom air intake portion, a rear air intake portion, a side air intake portion and an air outlet, the bottom air intake portion and the side air intake portion each being configured as a grille structure, the rear air intake portion including an inclined surface corresponding to the bending portion of the housing, the main air inlet of the housing, the bottom air intake portion and the air outlet cooperatively defining a first blowing passage, the secondary air inlet of the housing, the rear air intake portion and the air outlet cooperatively defining a second blowing passage, and the side air inlet of the housing, the side air intake portion and the air outlet cooperatively defining a third blowing passage.

5. The handheld blower according to claim 1 , wherein the housing defines two hanging holes having generally the same distance from the center of the handle, and the handheld blower further comprises a strap with two ends connected into the two hanging holes respectively.

6. The handheld blower according to claim 1 , wherein the duct assembly further comprises a connecting pipe for locking with the duct, the connecting pipe is connected with the blowpipe, the air guiding ribs are partially extending between the connecting pipe and the supporting ring, and each of the air guiding ribs has one end connected to the inner wall of the connecting pipe or the duct and the other end connected to the supporting ring.

7. The handheld blower according to claim 6 , wherein the supporting ring comprises an accommodating portion for accommodating the motor and an air guiding portion, the air guiding portion is a substantially tapered structure and formed with the accommodating portion in one piece, the air guiding portion is arranged on one end of the supporting ring adjacent to the blowpipe, a front end of the accommodating portion defines an opening, and the air guiding portion defines a plurality of air intakes.

8. The handheld blower according to claim 1 , wherein the fan comprises a hub mounted to a rotating shaft of the motor and a plurality of blades mounted to the hub, wherein a fairing is provided on one end of the fan adjacent to the housing and the motor is connected with the other end of the fan adjacent to the blowpipe.

9. The handheld blower according to claim 1 , wherein the handheld blower further comprises a control assembly having a boost button for controlling the blower to rotate at the maximum rotating speed, a speed adjusting button for adjusting the rotating speed of the blower and a trigger for controlling the switching-on/switching-off of the blower, the boost button, the speed adjusting button and the trigger being arranged on the gripping portion respectively.

10. The handheld blower according to claim 9 , wherein the handle comprises a speed adjusting portion arranged adjacent to the gripping portion and the speed adjusting button is arranged on the speed adjusting portion.

11. The handheld blower according to claim 1 , wherein the battery has a capacity in the range from 170 wh to 400 wh.

12. The handheld blower according to claim 1 , wherein the battery mounting assembly comprises a battery latch, a releasing button linked with the battery latch, and an ejecting head arranged on the housing, the releasing button being configured to disengage the battery latch from the battery, and the ejecting head being connected with an elastic member and being rotatable relative to the housing.

13. The handheld blower according to claim 1 , wherein the fan is an axial fan having an outer diameter in the range from 85 mm to 140 mm.

14. The handheld blower according to claim 1 , wherein the motor is a brushless DC motor having a diameter less than or equal to 35 mm, and the ratio of the air flow rate of the handheld blower to the diameter of the brushless DC motor is larger than 12 cfm/mm.

15. The handheld blower according to claim 1 , wherein along the direction of the central axis of the blowpipe, an area of a flow cross-section of an air passage at a rear end of the fan adjacent to the air inlet is larger than that of a flow cross-section at an air outlet of the blowpipe, and a flow-through area is formed between the inner wall of the housing and the hub of the fan, and wherein the ratio between the area of the flowing cross-section of the air outlet of the blowpipe and the area of the flow cross-section of the flow-through area at the position of the fan is greater than or equal to 0.8.

16. The handheld blower according to claim 1 , wherein an air passage between the fan and the air outlet defines an outer contour line, the outer contour line and the central axis cooperatively define an angle less than or equal to 8°, and the area of the cross-section of the air outlet of the blowpipe is greater than 4300 mm 2 .

17. The handheld blower according to claim 1 , wherein the handheld blower has an air flow rate in the range from 430 cfm to 700 cfm and a working time longer than 5 min.

18. The handheld blower according to claim 1 , wherein the ratio of the air flow rate to the input power is larger than or equal to 0.7 cfm/w when the handheld blower is operated at the maximum air flow rate.

Assignees

• Chervon Hk Ltd
• Chevron (Hk) Ltd

Inventors

• Yamaoka toshinari
• Shao Xiandian
• Nie Fangjie
• Guo Jianpeng

Classifications

• E01H1/0809

  Loosening or dislodging by blowing (combined with suction E01H1/0863; with steam E01H1/10; removing snow by blowing E01H5/106; cleaning rails by blowing E01H8/105, E01H8/125; removing fog by blowing E01H13/00; cleaning joints in road construction by blowing E01C23/0906); Drying by means of gas streams (combined with snow or ice melting E01H5/10) · CPC title

• A01G1/125

  Human Necessities · mapped topic

• A47L5/24 Primary

  Hand-supported suction cleaners · CPC title

• A01G20/47 Primary

  Vacuum or blower devices · CPC title

• A01G20/43

  for sweeping, collecting or disintegrating lawn debris · CPC title