GB2113802A - Shaft couplings - Google Patents

Shaft couplings Download PDF

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Publication number
GB2113802A
GB2113802A GB08201318A GB8201318A GB2113802A GB 2113802 A GB2113802 A GB 2113802A GB 08201318 A GB08201318 A GB 08201318A GB 8201318 A GB8201318 A GB 8201318A GB 2113802 A GB2113802 A GB 2113802A
Authority
GB
United Kingdom
Prior art keywords
hub
brush
circle
implement
disc
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
GB08201318A
Other versions
GB2113802B (en
Inventor
John Thomas Wilkins
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.)
RG Dixon and Co Ltd
Original Assignee
RG Dixon and 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 RG Dixon and Co Ltd filed Critical RG Dixon and Co Ltd
Priority to GB08201318A priority Critical patent/GB2113802B/en
Publication of GB2113802A publication Critical patent/GB2113802A/en
Application granted granted Critical
Publication of GB2113802B publication Critical patent/GB2113802B/en
Expired legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4036—Parts or details of the surface treating tools
    • A47L11/4038—Disk shaped surface treating tools
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/02—Floor surfacing or polishing machines
    • A47L11/10—Floor surfacing or polishing machines motor-driven
    • A47L11/14—Floor surfacing or polishing machines motor-driven with rotating tools
    • A47L11/16—Floor surfacing or polishing machines motor-driven with rotating tools the tools being disc brushes
    • A47L11/164—Parts or details of the brushing tools
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4063—Driving means; Transmission means therefor
    • A47L11/4069—Driving or transmission means for the cleaning tools
    • 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
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D1/108—Quick-acting couplings in which the parts are connected by simply bringing them together axially having retaining means rotating with the coupling and acting by interengaging parts, i.e. positive coupling
    • F16D1/112—Quick-acting couplings in which the parts are connected by simply bringing them together axially having retaining means rotating with the coupling and acting by interengaging parts, i.e. positive coupling the interengaging parts comprising torque-transmitting surfaces, e.g. bayonet joints

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Brushes (AREA)

Abstract

A coupling between a motor driven shaft and an implement such as a disc brush 15 in a floor cleaning or polishing machine includes a hub 20 mounted on the shaft, which hub has spaced recesses 24 disposed in a circle 26 and engaged by pins 16 on the implement, the pins being disposed in a circle having a radius different from that of the circle 26. The arrangement is such that the driving force is used to keep the implement to the hub and at each point of engagement of pin and recess has a direction which deviates from the tangent of the circle passing through that point and centred on the hub centre. <IMAGE>

Description

SPECIFICATION A quick coupling between a shaft driven by a motor and an implement such as a disc brush in a floor cleaning or polishing machine The present invention relates to a quick coupling between a shaft, driven by a motor and gear box, and an implement such as a disc brush in a floor cleaning or polishing machine.
Quick couplings of the above mentioned kind are previously known but they generally have a complicated structure and do not always work as intended.
By the present invention a quick coupling is achieved which is simple to use for the operator and which has a minimum of parts. This object will be achieved in a device according to the invention with the characterizing features of Claim 1 and
Claim 7.
An embodiment of the invention will now be described with reference to the attached drawings where Fig. 1 illustrates, in perspective, the type of floor cleaning or polishing machine in which the invention is intended to be used. Fig. 2 is a plan view of a brush according to the invention, whereas Fig. 3 shows said brush in a side view.
Fig. 4 is a plan view of the hub connected to the drive shaft whereas Fig. 5 is a side view of said hub.
As appears from the Figures, the machine consists of a stand 10 which carries an electric motor 11 and gear box with a vertical shaft. The machine has a handle 12 by means of which it can be advanced on the floor. The handle has a switch 13 for the power supply to the electric motor and carries also a reservoir 14 for cleaning or polishing liquid which in a way (not shown) is fed to a disc brush 1 5 on the drive shaft of the electric motor.
The brush 1 5 consists of a circular disc on one side of which a number of bristles are attached.
On the reverse of the disc three driving pins 1 6 are fixed in corresponding borings which are set out evenly at the same distance from the center so that the upper parts of the driving pins extend above the suiface of the disc. The upper part 1 8 of each driving pin has a seat 17 which makes contact with the disc, and from the seat the upper part of the driving pin, which consists of an upside-down truncated cone with a cone angle of 450, extends. Further, there is a central hole 19 for centering the disc.
The drive shaft (not shown) of the electric motor and gear box is provided with a hub 20 which consists of a circular guide 21 placed in the center, the outer periphery of which has a bevel 22. The guide 21 is fixed to a mainly triangular plate 23 the angles of the triangle having semicircular recesses 24 for the driving pins on the brush. Each recess 24 has a bevel 25 which corresponds to the shape of the truncated cone 18 on the driving pin.
The centers of the recesses are placed on a circle 26 the diameter of which is somewhat smaller than that of the corresponding circle 27 for the driving pins which means that the contact surface between driving pin and hub will be situated between said circles so that the drive resultant force D on the driving pin is directed as shown in the Figures. This implies an advantage in that said force prevents the separation of the brush from the hub when the machine is used. If the machine is tilted when used, which is not unusual, the outer periphery of the brush will be pressed more heavily against the floor than the central parts of the brush.This implies that a moment arises around the driving pin being closest to the point where the brush engages the floor and this moment, which is considerable owing to the length of the moment arm, tends to disengage the brush from the other driving pins. This is prevented, however, by the friction power generated from the drive resultant force which gives rise to an inverse moment.
Similarly a drive with the same benefit can be provided in which the circle 26 is larger than the circle 27 and the recesses are noncircular to give an outward acting drive force on the driving pins which acts similarly to the inward force described above.
The above described attachment also admits a quick disengagement of the brush by tilting the machine on its wheels so that the brush comes off the floor and activating the motor. When the motor and the hub is stopped, the brush will disengage with the hub owing to the mass forces and place itself on the floor without manual work.
A new brush can thereafter be placed on the hub and the driving pins are caused to engage with said hub whereupon the machine is ready to be used again.
It shall be pointed out that the above brush naturally can be replaced by other types of implements, e.g. discs on which polishing drums or polishing cloths can be applied.
CLAIMS 1. A quick coupling between a shaft driven by a motor and gear box and an implement such as a disc brush in a floor cleaning or polishing machine, characterized in that the drive shaft carries a hub which engages the implement in several points on a circle having a certain radius from the center of the hub and the resultant drive force is used to keep the implement to the hub, the resultant drive force having a direction in each point which deviates from the tangent of the circle belonging to the radius.
2. A quick coupling according to Claim 1, characterized in that the angle between the resultant drive force of the implement in each point and corresponding radius is smaller than 900.
3. A quick coupling according to Claim 1, characterized in that the angle between the resultant drive force of the implement in each point and corresponding radius is greater than 900.
4. A quick coupling according to Claim 1 characterized in that the hub has a number of
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A quick coupling between a shaft driven by a motor and an implement such as a disc brush in a floor cleaning or polishing machine The present invention relates to a quick coupling between a shaft, driven by a motor and gear box, and an implement such as a disc brush in a floor cleaning or polishing machine. Quick couplings of the above mentioned kind are previously known but they generally have a complicated structure and do not always work as intended. By the present invention a quick coupling is achieved which is simple to use for the operator and which has a minimum of parts. This object will be achieved in a device according to the invention with the characterizing features of Claim 1 and Claim 7. An embodiment of the invention will now be described with reference to the attached drawings where Fig. 1 illustrates, in perspective, the type of floor cleaning or polishing machine in which the invention is intended to be used. Fig. 2 is a plan view of a brush according to the invention, whereas Fig. 3 shows said brush in a side view. Fig. 4 is a plan view of the hub connected to the drive shaft whereas Fig. 5 is a side view of said hub. As appears from the Figures, the machine consists of a stand 10 which carries an electric motor 11 and gear box with a vertical shaft. The machine has a handle 12 by means of which it can be advanced on the floor. The handle has a switch 13 for the power supply to the electric motor and carries also a reservoir 14 for cleaning or polishing liquid which in a way (not shown) is fed to a disc brush 1 5 on the drive shaft of the electric motor. The brush 1 5 consists of a circular disc on one side of which a number of bristles are attached. On the reverse of the disc three driving pins 1 6 are fixed in corresponding borings which are set out evenly at the same distance from the center so that the upper parts of the driving pins extend above the suiface of the disc. The upper part 1 8 of each driving pin has a seat 17 which makes contact with the disc, and from the seat the upper part of the driving pin, which consists of an upside-down truncated cone with a cone angle of 450, extends. Further, there is a central hole 19 for centering the disc. The drive shaft (not shown) of the electric motor and gear box is provided with a hub 20 which consists of a circular guide 21 placed in the center, the outer periphery of which has a bevel 22. The guide 21 is fixed to a mainly triangular plate 23 the angles of the triangle having semicircular recesses 24 for the driving pins on the brush. Each recess 24 has a bevel 25 which corresponds to the shape of the truncated cone 18 on the driving pin. The centers of the recesses are placed on a circle 26 the diameter of which is somewhat smaller than that of the corresponding circle 27 for the driving pins which means that the contact surface between driving pin and hub will be situated between said circles so that the drive resultant force D on the driving pin is directed as shown in the Figures. This implies an advantage in that said force prevents the separation of the brush from the hub when the machine is used. If the machine is tilted when used, which is not unusual, the outer periphery of the brush will be pressed more heavily against the floor than the central parts of the brush.This implies that a moment arises around the driving pin being closest to the point where the brush engages the floor and this moment, which is considerable owing to the length of the moment arm, tends to disengage the brush from the other driving pins. This is prevented, however, by the friction power generated from the drive resultant force which gives rise to an inverse moment. Similarly a drive with the same benefit can be provided in which the circle 26 is larger than the circle 27 and the recesses are noncircular to give an outward acting drive force on the driving pins which acts similarly to the inward force described above. The above described attachment also admits a quick disengagement of the brush by tilting the machine on its wheels so that the brush comes off the floor and activating the motor. When the motor and the hub is stopped, the brush will disengage with the hub owing to the mass forces and place itself on the floor without manual work. A new brush can thereafter be placed on the hub and the driving pins are caused to engage with said hub whereupon the machine is ready to be used again. It shall be pointed out that the above brush naturally can be replaced by other types of implements, e.g. discs on which polishing drums or polishing cloths can be applied. CLAIMS
1. A quick coupling between a shaft driven by a motor and gear box and an implement such as a disc brush in a floor cleaning or polishing machine, characterized in that the drive shaft carries a hub which engages the implement in several points on a circle having a certain radius from the center of the hub and the resultant drive force is used to keep the implement to the hub, the resultant drive force having a direction in each point which deviates from the tangent of the circle belonging to the radius.
2. A quick coupling according to Claim 1, characterized in that the angle between the resultant drive force of the implement in each point and corresponding radius is smaller than 900.
3. A quick coupling according to Claim 1, characterized in that the angle between the resultant drive force of the implement in each point and corresponding radius is greater than 900.
4. A quick coupling according to Claim 1 characterized in that the hub has a number of recesses in which driving pins on the implement are intended to be inserted.
5. A quick coupling according to any preceeding claim, characterized in that the upper part of each driving pin is formed as an upsidedown truncated cone engaging a corresponding bevel on the recess belonging to the hub.
6. A quick coupling according to any preceeding claim, characterized in that the bevel of the recesses of the hub and the cone angle of the driving pin are about 450.
7. A coupling for connecting a drive shaft to a drivable member, for example a rotary brush of a floor cleaning or polishing machine, the coupling including a hub for mounting on the drive shaft, the hub including means for engaging the drivable member at several points spaced around a circle having a common centre with the hub, the resultant driving force causing the drivable member to be retained on the hub, and the resultant driving force having a direction at each of the several points which direction deviates from a tangent of the circle at the respective point.
8. A quick-release coupling for connecting a drive-shaft to a drivable member, the coupling being constructed and arranged substantially as herein described and shown in the drawings.
GB08201318A 1982-01-18 1982-01-18 Shaft couplings Expired GB2113802B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08201318A GB2113802B (en) 1982-01-18 1982-01-18 Shaft couplings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08201318A GB2113802B (en) 1982-01-18 1982-01-18 Shaft couplings

Publications (2)

Publication Number Publication Date
GB2113802A true GB2113802A (en) 1983-08-10
GB2113802B GB2113802B (en) 1986-04-23

Family

ID=10527688

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08201318A Expired GB2113802B (en) 1982-01-18 1982-01-18 Shaft couplings

Country Status (1)

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GB (1) GB2113802B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4892897A (en) * 1987-05-28 1990-01-09 Imperial Chemical Industries Plc Coating compositions
US5232303A (en) * 1990-05-22 1993-08-03 Wilkhahn Wilkening + Hahne Gmbh + Co. Connecting arrangement
GB2336991A (en) * 1998-05-08 1999-11-10 Applied Sweepers Ltd Quick-change brushes for sweeping machines
WO2001087540A1 (en) * 2000-05-17 2001-11-22 Holland Industriële Diamantwerken B.V. Floor-treating machine
DE4434520B4 (en) * 1993-10-04 2005-05-04 Nilfisk-Advance A/S Device for automatically attaching and detaching the brushes to so-called floor cleaning and drying machines
DE102004012780B3 (en) * 2004-03-15 2005-07-14 Gkn Walterscheid Gmbh Shaft and hub connection for joining shaft to hub has external toothed sector of shaft parallel to longitudinal axis and corresponding teeth in hub
US7329065B2 (en) 2004-11-05 2008-02-12 Spx Corporation Coupling assembly and method for connecting and disconnecting a shaft assembly

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4892897A (en) * 1987-05-28 1990-01-09 Imperial Chemical Industries Plc Coating compositions
US5232303A (en) * 1990-05-22 1993-08-03 Wilkhahn Wilkening + Hahne Gmbh + Co. Connecting arrangement
DE4434520B4 (en) * 1993-10-04 2005-05-04 Nilfisk-Advance A/S Device for automatically attaching and detaching the brushes to so-called floor cleaning and drying machines
GB2336991A (en) * 1998-05-08 1999-11-10 Applied Sweepers Ltd Quick-change brushes for sweeping machines
GB2336991B (en) * 1998-05-08 2002-01-16 Applied Sweepers Ltd Quick-change brushes
WO2001087540A1 (en) * 2000-05-17 2001-11-22 Holland Industriële Diamantwerken B.V. Floor-treating machine
NL1015226C2 (en) * 2000-05-17 2001-11-22 Holland Ind Diamantwerken Bv Floor processing machine.
US6783447B2 (en) 2000-05-17 2004-08-31 Holland Industriele Floor-treating machine
AU2001258931B2 (en) * 2000-05-17 2005-10-13 Holland Industriele Diamantwerken B.V. Floor-treating machine
DE102004012780B3 (en) * 2004-03-15 2005-07-14 Gkn Walterscheid Gmbh Shaft and hub connection for joining shaft to hub has external toothed sector of shaft parallel to longitudinal axis and corresponding teeth in hub
US7329065B2 (en) 2004-11-05 2008-02-12 Spx Corporation Coupling assembly and method for connecting and disconnecting a shaft assembly

Also Published As

Publication number Publication date
GB2113802B (en) 1986-04-23

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950118