GB2423124A - Inertial arresting gear applied to axial rotation in a garden implement - Google Patents

Inertial arresting gear applied to axial rotation in a garden implement Download PDF

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Publication number
GB2423124A
GB2423124A GB0602423A GB0602423A GB2423124A GB 2423124 A GB2423124 A GB 2423124A GB 0602423 A GB0602423 A GB 0602423A GB 0602423 A GB0602423 A GB 0602423A GB 2423124 A GB2423124 A GB 2423124A
Authority
GB
United Kingdom
Prior art keywords
follower wheel
inertial
arresting gear
housing
mobile pin
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
GB0602423A
Other versions
GB2423124B (en
GB0602423D0 (en
Inventor
Shuxing Ge
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.)
CHANGZHOU CREATE ELECTRIC APPL
Original Assignee
CHANGZHOU CREATE ELECTRIC APPL
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 CHANGZHOU CREATE ELECTRIC APPL filed Critical CHANGZHOU CREATE ELECTRIC APPL
Publication of GB0602423D0 publication Critical patent/GB0602423D0/en
Publication of GB2423124A publication Critical patent/GB2423124A/en
Application granted granted Critical
Publication of GB2423124B publication Critical patent/GB2423124B/en
Active 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
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/24—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member
    • F16D55/46—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member with self-tightening action
    • F16D55/48—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member with self-tightening action with discs or pads having a small free angular travel relative to their support, which produces the self-tightening action
    • 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
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc 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
    • F16D2121/00—Type of actuator operation force
    • F16D2121/14—Mechanical
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

An inertial arresting gear applied to axial rotation in garden implements comprises a working axle 7 used for attachment of the blade, housing 17 and brake means 12, a follower wheel 4 rotatably connected to the housing, wherein the follower wheel is connected to the working axle via a threaded connection (see part 7-4, fig.8) which enables relative rotation between the two, there existing a raised lug (see figs.2 and 3) on the follower wheel, and a limiter unit 5 which is fixed to the working axle 7 and located in a position within the height range of the lug. When the power supply is cut off, the blade and working axle overrun the follower wheel, the relative motion causing the follower wheel to ride up the working axle until it engages the braking means 12. Ideally, a friction pad is attached to a spring biased pin 13 slidably connected to the housing.

Description

INERTIAL ARRESTING GEAR APPLIED TO AXIAL ROTATION
IN A GARDEN IMPLEMENT
This invention relates to arresting gear used in garden implements.
Specifically, it relates to inertial arresting gear applied to axial rotation in garden implements.
After the power supply to a gardening implement having a working axle has been cut off, the working axle does not stop moving very quickly due to inertia. However, some units have special requirements, in that when the power supply has been cut off, the spinning implement affixed to the working axle should quickly stop moving. Taking for instance an electrical gardening implement being a grass trimmer having a spinning implement comprising a blade, rotation is caused by a belt between the working axle and the main axle of the electric motor, and the blade's rotation is required to stop within between 3 - 5 seconds of the electric motor's power supply being cut off. Currently such garden implements all have some form of mechanism that assists in arresting movement. Some rely on an electrical arresting mechanism, but if a failure of the electrical mechanism occurs, the unit can "seize", resulting in damage to the machine. In other cases a mechanical arresting mechanism is relied on, but the structures of mechanical arresting mechanisms already disclosed are all relatively complicated, and are not particularly reliable due to poor manufacturing and servicing standards. A drawback of other axial arresting mechanisms is that the manufacture of the structure is complicated, having high manufacturing costs. Also, the structure relies on the elasticity of a spring [or springs] to achieve braking. Due to spring elasticity reducing over time, they eventually become ineffective.
This invention provides a type of inertial arresting gear applied to axial rotation in garden implements which is capable of reducing the material requirements of components, whilst having a simple structure, which is highly reliable and which achieves the required standards.
This invention implements the following technical scheme: A type of inertial arresting gear applied to axial rotation in garden implements, comprising a working axle used for attachment of a blade, a follower wheel, a housing and brake means, the working axle for attachment of the blade being connected to the housing in a manner allowing rotation, the brake means being fitted to the housing, the working axle and follower wheel having a threaded joint, the extremity of the follower wheel having a raised element, and there being a selector unit fixed to the working axle, the selector unit being installed in a manner that the rotating face of the selector unit is in a position within the height range of the raised element. The brake means may comprise a brake shoe.
When compared to the prior art, this invention has the following benefits: (1) When the power supply is cut off, there is a difference in the inertia remaining between the working axle and the spinning attachment (blade etc.) attached to the working axle and the follower wheel, resulting in opposite rotation of the working axle and follower wheel. This causes the axial movement of the follower wheel, with the effect that the surface of the medial extremity of the follower wheel comes into contact and exerts a force on the brake means attached to the housing, resulting in braking friction, the positive braking friction pressure resulting being achieved via the threaded joint. When compared to the prior art, the method of producing the required friction represents a reduction in the requirements for the materials used in the components, thus reducing cost, the simple structure satisfying the standards required for reliable braking, whilst manufacturing and maintenance are straightforward. When the electric motor is switched on, the follower wheel begins to spin. This rotates in the opposite direction to the working axle that is currently in a state of stationary inertia, and this results in the medial extremity of the follower wheel losing contact with the brake means, the tool then reaching its operational mode.
(2) When the brake means comprises a mobile pin, an arrestor pin, a spring and the mobile pin base, when braking occurs, the spring acts in a way that the brake means presses closely on the follower wheel in a continuous manner, providing excellent braking and reliability, whilst also overcoming the drawbacks of poor braking efficiency due to the braking surface having irregularities.
(3) By taking the technical approach of attaching a friction pad to the follower wheel, reliability is increased, lengthening the usable life, and simplifying the manufacturing technique, reducing costs without reducing braking efficiency. The structure of the friction pad is simple, easily manufactured and when connected with the follower wheel it improves wear and friction and reduces manufacturing requirements thus satisfying the braking requirements of such a follower wheel.
(4) There is a lug the position of which may be altered, allowing for its suitable positioning.
Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:Figure 1 is a structural representation of an inertial arresting gear applied to axial rotation in a garden implement according to a first embodiment of the invention and including an open circlip; Figure 2 is a magnified partial representation in direction A of Figure 1, except that the open circlip is not shown; Figure 3 is an isometric view of a follower wheel of the inertial arresting gear; Figure 4 is an isometric view of a modified follower wheel; Figure 5 is a structural representation of the inertial arresting gear including a friction pad; Figure 6 is a structural representation of an inertial arresting gear according to a second embodiment of the invention; Figure 7 is a structural representation of an inertial arresting gear according to a third embodiment of the invention; and Figure 8 is a partial structural representation of the inertial arresting gear according to at least the first embodiment of the invention.
With reference to Figure 1 of the accompanying drawings, a type of inertial arresting gear is applied to axial rotation in a garden implement which has an electric motor 1, a drive wheel 2, a belt 3, open circlips 6 and 11, a self- lubricating bearing 8, and bearings 9 and 10. The inertial arresting gear comprises a working axle 7 used for attachment of a blade, a follower wheel 4, a housing 17 and brake means. The working axle 7 for attachment of the blade is connected to the housing 17 in a manner allowing rotation and the brake means is filled to the top of the housing 17. The working axle 7 and follower wheel 4 have a threaded joint 7-4 (see Figure 8) and the extremity of the follower wheel 4 has a raised element 4-1 (see Figure 2). There is a selector unit 5 fixed to the working axle 7 and this is installed in a manner so that the rotating face of the selector unit 5 is in a position within the height range of the raised element 4-1.
In this embodiment, the brake means comprises a mobile pin 13, an arrestor pin 14, a spring 15 and a mobile pin base 18. The mobile pin base 18 is located on the top of the housing 17, and the mobile pin 13 and spring 15 are located within the mobile pin base 18. The spring 15 is located between the mobile pin 13 and the top of the mobile pin base 18 and the circumference of the mobile pin 13 has an arrestor slide groove 13-1. The arrestor pin 14 is located inside the mobile pin base 18 and its distal end is located in the arrestor slide groove 13-1. There is a friction pad 12 located beneath the mobile pin 13 and with reference to Figure 5, on the end face of the follower wheel 4 facing the friction pad 12 there is a friction plate 16.
Referring to Figure 6, the inertial arresting gear is similar to that described in the first embodiment. However, the friction pad 12 is located on the end face of the follower wheel 4 facing the mobile pin 13 replacing the friction plate 16.
Referring to Figure 7, in this embodiment the brake means uses the friction pad 12 and the friction pad 12 is located on the extremity of the follower wheel 4 like in the embodiment illustrated in Figure 6. A leaf spring 19 is located beneath the housing 17 and the leaf spring 19 is in a position in which it is superimposed over the friction pad 12. The raised element 4-1 at the extremity of the follower wheel 4 comprises a lug which is fixed on the follower wheel 4 by screws 4-11 (see Figure 3) and there are also screw holes 4-12 allowing adjustment of the position of the lug on the follower wheel 4. The selector unit 5 fixed to the working axle 7 is of a round plate shape and its diameter is less than that of the distance between the centre of the follower wheel 4 and the inner side of the raised element 4-1, there being a selector lever 5-1 (see Figure 2) located on the plate shaped selector unit 5.

Claims (9)

  1. Claims: 1. An inertial arresting gear applied to axial rotation in garden
    implements, comprising a working axle used for attachment of a blade, a follower wheel, a housing and brake means, the working axle for attachment of the blade being connected to the housing in a manner allowing rotation, the brake means being fitted to the housing, with the characteristics that the working axle is connected to the follower wheel with a threaded joint, there being a raised element on the extremity of the follower wheel, and a selector unit fixed to the follower wheel, the selector unit being installed in a manner that the rotating face of the selector unit is in a position within the height range of the raised element.
  2. 2. The inertial arresting gear according to claim 1, wherein the brake means comprises a mobile pin, an arrestor pin, a spring and a mobile pin base, the mobile pin base being located above the housing, the mobile pin and the spring being located within the mobile pin base, the spring being located between the mobile pin and the end of the mobile pin base distal from the housing, there being an arrestor slide groove located on the circumference of the mobile pin, the arrestor pin being located inside the mobile pin base, its distal end being located in the arrestor slide groove.
  3. 3. The inertial arresting gear according to claim 2, including a friction pad located on the mobile pin.
  4. 4. The inertial arresting gear according to claim 3, including a friction plate located on an end face of the follower wheel opposite the friction pad.
  5. 5. The inertial arresting gear according to claim 2, including a friction pad located on an end face of the follower wheel opposite the mobile pin.
  6. 6. The inertial arresting gear according to claim 1, wherein the brake shoe uses a friction pad and the friction pad is located on an end face of the follower wheel facing the housing, there being a leaf spring located beneath the housing the leaf spring being in a position in which it is superimposed over the friction pad.
  7. 7. The inertial arresting gear according to any preceding claim, wherein the raised element comprises a lug which is fixed with screws to the follower wheel, there being screw holes on the follower wheel allowing adjustment of the position of the lug.
  8. 8. The inertial arresting gear according to any preceding claim, wherein the selector unit is of a round plate shape and its diameter is less than that of the distance between the centre of the follower wheel and the inner side of the raised element, there being a selector lever located on the plate shaped selector unit.
  9. 9. An inertial arresting gear applied to axial rotation in garden implements constructed substantially as hereinbefore described with reference to Figures 1 to 3 and 8 or any one of Figures 4 to 7 of the accompanying drawings.
GB0602423A 2005-02-07 2006-02-07 Inertial arresting gear applied to axial rotation in a garden implement Active GB2423124B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2005100383103A CN1300480C (en) 2005-02-07 2005-02-07 Inertial rotation axial braking device for gardening tool

Publications (3)

Publication Number Publication Date
GB0602423D0 GB0602423D0 (en) 2006-03-22
GB2423124A true GB2423124A (en) 2006-08-16
GB2423124B GB2423124B (en) 2007-08-22

Family

ID=35035629

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0602423A Active GB2423124B (en) 2005-02-07 2006-02-07 Inertial arresting gear applied to axial rotation in a garden implement

Country Status (4)

Country Link
CN (1) CN1300480C (en)
DE (1) DE102006005416B8 (en)
GB (1) GB2423124B (en)
WO (1) WO2006081714A1 (en)

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GB0515840D0 (en) * 2005-08-02 2005-09-07 Bosch Gmbh Robert Improvements in or relating to braking systems
CN102103038B (en) * 2010-12-08 2013-09-18 浙江华电器材检测研究所 Test system for blade stop time of pruning scissors
CN102388724B (en) * 2011-08-30 2013-07-10 浙江亚特电器有限公司 Mower braking structure
CN103168568B (en) * 2011-12-22 2015-10-07 浙江三锋实业股份有限公司 Dead-man's device
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
CN107869537B (en) * 2017-10-11 2019-07-16 浙江派赛特动力机械有限公司 A kind of cutter shaft drive mechanism having reverse direction brake function

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GB1361330A (en) * 1972-11-21 1974-07-24 Int Harvester Co Agricultural implements with braking mechanisms
US3897678A (en) * 1971-04-13 1975-08-05 Int Harvester Co Self actuating mechanism for braking a driven member upon discontinuation of drive thereto
GB2324127A (en) * 1997-04-11 1998-10-14 Electrolux Outdoor Prod Ltd Brake assembly for a powered rotary tool e.g. a lawnmower or a hedge trimmer

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Publication number Priority date Publication date Assignee Title
US3897678A (en) * 1971-04-13 1975-08-05 Int Harvester Co Self actuating mechanism for braking a driven member upon discontinuation of drive thereto
GB1361330A (en) * 1972-11-21 1974-07-24 Int Harvester Co Agricultural implements with braking mechanisms
GB2324127A (en) * 1997-04-11 1998-10-14 Electrolux Outdoor Prod Ltd Brake assembly for a powered rotary tool e.g. a lawnmower or a hedge trimmer

Also Published As

Publication number Publication date
WO2006081714A1 (en) 2006-08-10
CN1664399A (en) 2005-09-07
GB2423124B (en) 2007-08-22
DE102006005416B4 (en) 2009-11-26
DE102006005416B8 (en) 2010-02-25
CN1300480C (en) 2007-02-14
GB0602423D0 (en) 2006-03-22
DE102006005416A1 (en) 2007-04-12

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