GB2475139A - Power tool having a centrifugal brake mounted on a work spindle - Google Patents

Power tool having a centrifugal brake mounted on a work spindle Download PDF

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Publication number
GB2475139A
GB2475139A GB1017682A GB201017682A GB2475139A GB 2475139 A GB2475139 A GB 2475139A GB 1017682 A GB1017682 A GB 1017682A GB 201017682 A GB201017682 A GB 201017682A GB 2475139 A GB2475139 A GB 2475139A
Authority
GB
United Kingdom
Prior art keywords
brake
turning wheel
elastic member
work spindle
brake pad
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB1017682A
Other versions
GB201017682D0 (en
GB2475139B (en
Inventor
Zugen Ni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou Kingclean Floorcare Co Ltd
Original Assignee
Suzhou Kingclean Floorcare Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suzhou Kingclean Floorcare Co Ltd filed Critical Suzhou Kingclean Floorcare Co Ltd
Publication of GB201017682D0 publication Critical patent/GB201017682D0/en
Publication of GB2475139A publication Critical patent/GB2475139A/en
Application granted granted Critical
Publication of GB2475139B publication Critical patent/GB2475139B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/67—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator
    • A01D34/68—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator with motor driven cutters or wheels
    • A01D34/6806—Driving mechanisms
    • A01D34/6812—Braking or clutching mechanisms
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D69/00—Driving mechanisms or parts thereof for harvesters or mowers
    • A01D69/10—Brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D49/00—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D59/00—Self-acting brakes, e.g. coming into operation at a predetermined speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/001—Auxiliary mechanisms for automatic or self-acting brake operation
    • F16D2127/002—Auxiliary mechanisms for automatic or self-acting brake operation speed-responsive

Abstract

A power tool, preferably a mower, which includes a support 3 provided with motor 1 and a work spindle 2 having a turning wheel 4 fixed thereon and driven to rotate by the motor spindle 5. A brake ring 6, fixed on the support 3, is sleeved around the work spindle 2 and extends into the turning wheel 4. During the normal operation, centrifugal force of the brake pad 9 is bigger than pressure of the elastic member 8, preferably a spring, and thus the brake pad 9 will be radially separated from the brake ring 6; while during the brake operation, centrifugal force of the brake pad 9 is smaller than pressure of the elastic member 8, and thus the brake pad 9 will be radially brought into contact with the brake ring 6. The brake device being located on the work spindle 2, not only facilitates the structural design, but also improves the brake effect.

Description

POWER TOOL
FIELD OF THE INVENTION
The present invention relates to a mower brake device.
BACKGROUND OF THE INVENTION
A mower is a common electric planting tool, which uses a motor as the driving device, and works through a work spindle provided with a blade and driven by a strap or a gear. If it is required to stop the mower during operation, the power supply will have to be cut off first, however the blade and the work spindle will still run are at a high speed for a period of time under the action of inertia. Hence, the safety requirements cannot be satisfied, and even serious personal injuly may be resulted. The blade is required in the design indexes to stop running within 3-5 seconds after the power supply is cut off. Therefore, all the manufacturers install a brake device on the mowers.
A mower brake device currently in the market is generally installed on a motor spindle, which has the following shortcomings: 1. The motor spindle has to be lengthened lengthways for installation of the brake device, thus making the structural design difficult; 2. with the motor spindle rotating much faster than the work spindle, the brake device installed at the end of the motor spindle will accelerate abrasion of a friction lining and thus shorten service life of the friction lining; and 3. with the brake device installed on the motor spindle, a transmission gear will be brought into a stressed state during brake operation, which will not only make the transmission gear easily damaged, but also worsen the brake effect.
CONTENTS OF THE INVENTION
The purpose of the invention is to provide a power tool, which is installed on the work spindle of the planting tool, being advantageous in such aspects as simple structure, high safety, good brake effect, and long service life.
A technical solution of this power tool is as below: The power tool includes a support provided with a motor and a work spindle; a turning wheel, fixed on the work spindle, is driven to rotate by the motor spindle; a brake ring, fixed on the support, is sleeved around the work spindle and stretched into the turning wheel; on the turning wheel is formed at least one installation chamber, inside which are positioned an elastic member that can move along radial direction of the brake ring as well as a brake pad that is positioned at one end of this elastic member and can move towards/away from the brake ring with the movement of the elastic member; during normal operation, centrifugal force of the brake pad is bigger than pressure of the elastic member, and thus the brake pad will be separated from the brake ring; while during brake operation, centrifugal force of the brake pad is smaller than pressure of the elastic member, and thus the brake pad will be brought into contact with the brake ring.
The installation chamber is also open at the outer end; the turning wheel is fixedly provided with a bearing plate at the position corresponding to the outer opening of the installation chamber; and part of the bearing plate is stretched into outer end of the installation chamber and tightly pressing the outer end of the elastic member.
The support includes a connection ring that is sleeved around the work spindle and stretched downwards into the upper part of the turning wheel, the turning wheel being fixed on the work spindle at the lower part, the brake ring being sleeved around and fixed on the connection ring; and the work spindle is installed at the upper part in the support and the connection ring thereof via a first bearing and a second bearing.
The motor spindle is at the lower end stretched out of the support and fixedly provided with a small turning wheel; a driving belt is sleeved around the small turning wheel and the turning wheel; and the motor spindle drives the turning wheel to rotate via the small turning wheel and the driving belt.
The second purpose of the present invention is to provide a planting tool with the above-mentioned brake device, which is advantageous in such aspects as simple structure, high safety, good brake effect, and long service life.
A technical solution of the planting tool with the above-mentioned brake device is as below: The planting tool includes a blade driven by tail end of the work spindle, the installation chamber being positioned protuberantly from the top surface of the turning wheel and below the support.
The third purpose of the present invention is to provide a lawn mower comprising: a support provided with a motor and a work spindle, a turning wheel being fixed on the work spindle, a motor spindle driving the turning wheel to rotate, a blade driven by tail end of the work spindle; characterized in that: a brake ring, fixed on the support, is sleeved around the work spindle and stretched into the turning wheel; on the turning wheel is formed at least one installation chamber, inside which are positioned an elastic member that can move along radial direction of the brake ring as well as a brake pad that is positioned at one end of the elastic member and is able to move towards or away from the brake ring with the movement of the elastic member; during work operation, centrifugal force of the brake pad is bigger than pressure of the elastic member, and thus the brake pad will be separated from the brake ring; and during brake operation, the centrifugal force of the brake pad is smaller than the pressure of the elastic member, and thus the brake pad will be brought into contact with the brake ring.
Said brake pad extends partially out of the installation chamber.
The present invention has the following advantages: 1. The present invention, with the brake device being transferred from the motor spindle to the work spindle, not only facilitates the structural design, but also improves the brake effect.
2. The work spindle rotates much slower than the motor spindle after being decelerated with the small turning wheel, the driving belt and the turning wheel, and thus the present invention can prolong service life of the friction lining.
3. The present invention, after the motor being switched off, will get the rotational speed decreased under the action of various resistances, with the centrifugal force of the brake pad being also decreased; when the centrifugal force is smaller than the pressure of the elastic member, the brake pad will be brought into contact with the brake ring, and the rotational speed decreased rapidly under the action of friction, thus realizing fast brake.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will further be described below with reference to drawings and embodiments.
Figure 1 is a lateral view of the present invention.
Figure 2 is a partial sectional view of the present invention.
Figure 3 is an assembly drawing of the present invention.
In the drawings: 1. Motor; 2. work spindle; 3 support; 31.
connection ring; 4. turning wheel; 5. motor spindle; 6. brake ring; 7.
installation chamber; 8. elastic member; 9. brake pad; 10. bearing plate; 11. small turning wheel; 12. driving belt; 13. bolt; 14. blade;l5. first bearing; and 16. second bearing.
DETAILED DESCRIPTION OF THE EMBODIMENTS
Embodiment: As shown in Figures 1 to 3, a power tool is provided, including a support 3 provided with a motor 1 and a work spindle 2; a turning wheel 4 and a blade 14 are fixed on the work spindle 2; the motor spindle 5 is at the lower end stretched out of the support 3 and fixedly provided with a small turning wheel 11; a driving belt 12 is sleeved around the small turning wheel 11 and the turning wheel 4; and the motor spindle 5 drives the turning wheel 4 to rotate via the small turning wheel 11 and the driving belt 12.
The support 3 includes a connection ring 31 that is sleeved around the work spindle 2 and stretched downwards into the upper part of the turning wheel 4, the turning wheel 4 being fixed on the work spindle 2 at the lower part. In this embodiment, the turning wheel 4 and the work spindle 2 constitute an integral structure. The work spindle 2 is installed at the upper part in the support 3 and the connection ring 31 thereof via a first bearing 15 and a second bearing 16.
A brake ring 6 is sleeved around and fixed on the connection ring 31; at the upper part of the turning wheel 4 are formed two opposite installation chambers 7s, inside which are positioned an elastic member 8 that can move radially as well as a brake pad 9 that is positioned at one end of this elastic member 8 and can move towards/away from the brake ring 6 with the movement of the elastic member 8; during the nonnal operation, centrifugal force of the brake pad 9 is bigger than pressure of the elastic member 8, and thus the brake pad 9 will be separated from the brake ring 6; while during the brake operation, centrifugal force of the brake pad 9 is smaller than pressure of the elastic member 8, and thus the brake pad 9 will be brought into contact with the brake ring 6; the installation chamber 7 is also open at the outer end; the turning wheel 4 is fixedly provided with a bearing plate via a bolt 13 at the position corresponding to the outer opening of the installation chamber 7; and part of the bearing plate 10 is stretched into outer end of the installation chamber 7, with the outer end tightly pressing the elastic member 8. In this embodiment, the elastic member 8 is selected to be a spring.
The present invention further claims to protect a planting tool provided with the above-mentioned brake device, which includes a blade 14 driven by tail end of the work spindle 2, the installation chamber 7 being positioned protuberantly from top surface of the turning wheel and below the support.
The planting tool in this embodiment is a mower, whose operating state is as below: Before the motor 1 is started, the brake pad 9 is brought into contact with the brake ring 6 under the action of pressure of the spring; after the motor 1 is started, the rotational speed goes up very rapidly; when the turning wheel 4 reaches a certain rotational speed, centrifugal force of the brake pad 9 is bigger than the pressure of the spring, making the brake pad 9 thrown outwards and thus separated from the brake ring 6, thus the mower entering a mowing state.
The motor 1, after being switched off, will get the rotational speed decreased under the action of various resistances, with the centrifugal force of the brake pad 9 being also decreased; when the centrifugal force is smaller than the pressure of the spring, the brake pad 9 will be brought into contact with the brake ring 6, and the rotational speed decreased rapidly under the action of friction, thus realizing the brake function.

Claims (8)

  1. What is claimed is: 1. A power tool, comprising: a support (3) provided with a motor (1) and a work spindle (2), a turning wheel (4) being fixed on the work spindle (2), a motor spindle (5) driving the turning wheel (4) to rotate; characterized in that: a brake ring (6), fixed on the support (3), is sleeved arouiid the work spindle (2) and stretched into the turning wheel (4); on the turning wheel (4) is formed at least one installation chamber (7), inside which are positioned an elastic member (8) that can move along radial direction of the brake ring (6) as well as a brake pad (9) that is positioned at one end of the elastic member (8) and is able to move towards or away from the brake ring (6) with the movement of the elastic member (8); during work operation, centrifugal force of the brake pad (9) is bigger than pressure of the elastic member (8), and thus the brake pad (9) will be separated from the brake ring (6); and during brake operation, the centrifugal force of the brake pad (9) is smaller than the pressure of the elastic member (8), and thus the brake pad (9) will be brought into contact with the brake ring (6).
  2. 2. The power tool according to claim 1, wherein the support (3) includes a connection ring (31) that is sleeved around the work spindle (2) and stretched into the upper part of the turning wheel (4), the turning wheel (4) being fixed on the work spindle (2) at the lower part, the brake ring (6) being sleeved around and fixed on the connection ring (31).
  3. 3. The power tool according to claim 2, wherein the upper portion of the work spindle (2) is installed in the support (3) and the connection ring (31) thereof via a first bearing (15) and a second bearing (16), respectively.
  4. 4. The power tool according to claim 1 or 2, wherein the installation chamber (7) is open at the outer end; the turning wheel (4) is fixedly provided with a bearing plate (10) at a position corresponding to the outer opening of the installation chamber (7); and part of the bearing plate (10) is stretched into outer end of the installation chamber (7) and tightly pressing the outer end of the elastic member (8).
  5. 5. The power tool according to claim 1 or 2, wherein the motor spindle (5) is at the lower end stretched out of the support (3) and fixedly provided with a small turning wheel (11); a driving belt (12) is sleeved around the small turning wheel (11) and the turning wheel (4); and the motor spindle (5) drives the turning wheel (4) to rotate via the small turning wheel (11) and the driving belt (12).
  6. 6. A planting tool provided with the power tool according to claim 1, comprising a blade (14) driven by tail end of the work spindle (2); wherein the installation chamber (7) is positioned protuberantly from the top surface of the turning wheel (4) and below the support (3).
  7. 7. A lawn mower comprising: a support (3) provided with a motor (1) and a work spindle (2), a turning wheel (4) being fixed on the work spindle (2), a motor spindle (5) driving the turning wheel (4) to rotate, a blade (14) driven by tail end of the work spindle (2); characterized in that: a brake ring (6), fixed on the support (3), is sleeved around the work spindle (2) and stretched into the turning wheel (4); on the turning wheel (4) is formed at least one installation chamber (7), inside which are positioned an elastic member (8) that can move along radial direction of the brake ring (6) as well as a brake pad (9) that is positioned at one end of the elastic member (8) and is able to move towards or away from the brake ring (6) with the movement of the elastic member (8); during work operation, centrifugal force of the brake pad (9) is bigger than pressure of the elastic member (8), and thus the brake pad (9) will be separated from the brake ring (6); and during brake operation, the centrifugal force of the brake pad (9) is smaller than the pressure of the elastic member (8), and thus the brake pad (9) will be brought into contact with the brake ring (6).
  8. 8. A lawn mower according to claim 7, wherein said brake pad extends partially out of the installation chamber (7).
GB1017682.4A 2009-11-04 2010-10-20 Power tool Expired - Fee Related GB2475139B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009101744662A CN101699950B (en) 2009-11-04 2009-11-04 Braking device for gardening tools

Publications (3)

Publication Number Publication Date
GB201017682D0 GB201017682D0 (en) 2010-12-01
GB2475139A true GB2475139A (en) 2011-05-11
GB2475139B GB2475139B (en) 2012-03-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB1017682.4A Expired - Fee Related GB2475139B (en) 2009-11-04 2010-10-20 Power tool

Country Status (3)

Country Link
CN (1) CN101699950B (en)
DE (1) DE102010043319B4 (en)
GB (1) GB2475139B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013007962A3 (en) * 2011-07-13 2013-03-07 Husqvarna Uk Limited Brakes
WO2013029292A1 (en) * 2011-08-30 2013-03-07 嘉兴亚特园林机械研究所 Mower brake structure

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104137709B (en) * 2013-05-09 2018-01-30 天佑电器（苏州）有限公司 Brake apparatus and the garden instrument with the brake apparatus
CN104170590B (en) * 2013-05-27 2017-06-13 苏州金莱克精密机械有限公司 Electric tool and its motor with improvement brake structure
CN104141712A (en) * 2014-07-10 2014-11-12 浙江亚特电器有限公司 Brake mechanism
CN104963968B (en) * 2015-06-30 2017-04-19 重庆怡之驰机械有限公司 Roll ball locking device
CN105864322A (en) * 2016-06-06 2016-08-17 苏州金莱克精密机械有限公司 Centrifugal brake mechanism of motor
DE102017223798A1 (en) * 2017-12-27 2019-06-27 Robert Bosch Gmbh braking device
CN109362357B (en) * 2018-10-12 2024-02-13 浙江亚特电器股份有限公司 Mower brake device and mower
DE102019113111B4 (en) 2019-05-17 2022-08-04 Logicdata Electronic & Software Entwicklungs Gmbh Linear actuator, actuator system, piece of furniture and method for driving a linear actuator

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EP1922912A1 (en) * 2006-11-15 2008-05-21 Husqvarna UK Limited Brake assembly
WO2008103079A1 (en) * 2007-02-22 2008-08-28 Husqvarna Aktiebolag Retarding device for a rotational cutting machine

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US3760570A (en) * 1972-09-05 1973-09-25 Black & Decker Mfg Co Centrifugally responsive brake for rotary tool
US4205737A (en) * 1977-09-02 1980-06-03 Briggs & Stratton Corporation Clutch-brake mechanism for rotary mower engines
JP4341804B2 (en) * 2001-01-23 2009-10-14 本田技研工業株式会社 Brush cutter
CN2904621Y (en) * 2006-01-09 2007-05-30 苏州金莱克家用电器有限公司 Lawn mower brake
CN101467507B (en) 2007-12-27 2011-08-03 苏州宝时得电动工具有限公司 Brake device of garden tools
CN201557393U (en) * 2009-11-04 2010-08-25 金莱克电气股份有限公司 Garden tool brake device

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
EP1922912A1 (en) * 2006-11-15 2008-05-21 Husqvarna UK Limited Brake assembly
WO2008103079A1 (en) * 2007-02-22 2008-08-28 Husqvarna Aktiebolag Retarding device for a rotational cutting machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013007962A3 (en) * 2011-07-13 2013-03-07 Husqvarna Uk Limited Brakes
WO2013029292A1 (en) * 2011-08-30 2013-03-07 嘉兴亚特园林机械研究所 Mower brake structure

Also Published As

Publication number Publication date
DE102010043319A1 (en) 2011-06-16
GB201017682D0 (en) 2010-12-01
GB2475139B (en) 2012-03-14
CN101699950A (en) 2010-05-05
CN101699950B (en) 2011-07-27
DE102010043319B4 (en) 2022-03-24

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20221020