EP0839243B1 - Apparatus for working floor surfaces - Google Patents

Apparatus for working floor surfaces Download PDF

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Publication number
EP0839243B1
EP0839243B1 EP96924212A EP96924212A EP0839243B1 EP 0839243 B1 EP0839243 B1 EP 0839243B1 EP 96924212 A EP96924212 A EP 96924212A EP 96924212 A EP96924212 A EP 96924212A EP 0839243 B1 EP0839243 B1 EP 0839243B1
Authority
EP
European Patent Office
Prior art keywords
handle
rotation
tool carrier
axis
support means
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.)
Expired - Lifetime
Application number
EP96924212A
Other languages
German (de)
French (fr)
Other versions
EP0839243A1 (en
Inventor
Claes-Göran BERGSTRAND
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.)
Scanmaskin Sverige AB
Original Assignee
Scanmaskin Sverige AB
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 Scanmaskin Sverige AB filed Critical Scanmaskin Sverige AB
Publication of EP0839243A1 publication Critical patent/EP0839243A1/en
Application granted granted Critical
Publication of EP0839243B1 publication Critical patent/EP0839243B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F21/00—Implements for finishing work on buildings
    • E04F21/20—Implements for finishing work on buildings for laying flooring
    • E04F21/24—Implements for finishing work on buildings for laying flooring of masses made in situ, e.g. smoothing tools
    • E04F21/245—Rotary power trowels, i.e. helicopter trowels
    • E04F21/248—Rotary power trowels, i.e. helicopter trowels used by an operator walking behind the trowel, i.e. walk-behind power trowels

Definitions

  • the present invention relates to an apparatus for working floor surfaces, for example when laying a floor with a thermosetting plastic surface, comprising a handle which is designed as an extension arm which is connected to a tool carrier having at least one working tool for sweeping the floor surface by rotation of the tool carrier around an axis of rotation which is to be substantially vertical in use, and which handle enables movement of the apparatus along the floor surface and is connected to the tool carrier via a pivot shaft which is to be substantially horizontal in use, the pivot connection of the handle to the tool carrier being located at a distance from the axis of rotation of the tool carrier, said apparatus further comprising a support means for the handle to rest upon.
  • Devices according to the above are known and may for example be used for laying an epoxy floor, in order to even out and planish the surface of the sticky, not yet hardened plastic surface, usually after spreading out slip protection upon said surface.
  • These known devices are driven by an electric motor which obtains electric current via a long electric cable from a common mains socket.
  • the apparatus is handled by an operator equipped with spike shoes which pushes and pulls the apparatus to and fro and sideways, in order to provide an even sweeping of the surface of the floor. At the same time, the operator must ensure that the electric cable does not get into contact with the sticky surface.
  • One object of the present invention is therefore to provide an apparatus which causes less stress upon the operator and which may be designed as to be saving weight.
  • the invention is characterized in that the support means is located at the opposite side of the axis of rotation, relative to the pivot connection of the handle, and that the handle is arranged to be liftable from the support means in use by rotation around the pivot shaft.
  • the handle preferably extends at an oblique angle to the horizontal plane from its pivot connection, upwards past the axis of rotation of the tool carrier and the support means, to an operator of the apparatus.
  • the axis of rotation of the tool carrier is preferably carried by a chassis member which also carries the pivot connection of the handle and the support means.
  • This chassis part may also be provided with a drive motor for driving the rotation axis of the tool carrier.
  • the drive motor is preferably electrical and connected via a cable to a source of electricity which may be one or more electricity accumulators which are being carried by the operator.
  • the apparatus shown in Fig. 1 and 2 comprises a handle 10 which is designed as a T-shaped extension arm having two hand grips 11.
  • the opposite end of the handle 10 as seen from the hand grips is designed as a fork with two shanks 12, which are connected to a rectangular chassis member 13 via projecting horizontal arms 14 which are provided with pivot points 15.
  • the chassis member 13 is provided with a bearing unit 16 for a vertical rotation shaft 17 belonging to a tool carrier 18 which is designed as a wheel and is provided with a number of scraping iron blades 19. These blades 19 are brought to sweep the floor surface by the rotation of the tool carrier, which is provided by an electric motor 20 which is connected to the axis of rotation 17 by not shown gearing and transmission means.
  • the chassis member is also provided with a support means 21 for the handle 10 which is located at the opposite side of the axis 17 of rotation, relative to the pivot connection 15 of the handle. Because the pivot connection of the handle to the chassis member 13 is located at a certain distance from the axis 17 of rotation of the tool carrier, the weight of the handle together with the weight of the electric motor 20 in position of use upon a floor surface, will exert a pressure upon the opposite side of the axis 17, as seen from the handle 10. If on the other hand the handle 10 is allowed to rest upon the support means 21, the centre of gravity will be moved from said earlier mentioned position at the pivot points 15, to the support means at the opposite side of the axis of rotation 17.
  • an apparatus which is light and by being unstable, has become unexpectedly simple to steer along a floor surface, in such a manner that the apparatus does not risk "running away” to any unwanted direction.
  • the apparatus according to the invention may be designed so light that the drive motor 20 may be of a type so electricity-saving, that the source of energy may be rechargeable batteries which can be carried by the operator, e.g. within a backpack. In this way, it is not necessary to pull an electric cable over an easily damaged, sticky floor surface.
  • the handle 10 may be designed differently, e.g. in such a way that the pivot points of the handle are located at the operator side of the axis 17 of rotation and the support member at the opposite side, wherein the handle is lifted against the support means when the apparatus is to be moved to one side.

Landscapes

  • Architecture (AREA)
  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Handcart (AREA)
  • Soil Working Implements (AREA)
  • Crushing And Grinding (AREA)
  • Carpets (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
  • Floor Finish (AREA)
  • Coating Apparatus (AREA)

Abstract

An apparatus for working floor surfaces, for example when laying a floor with a thermosetting plastic surface. The apparatus comprises a handle (10) which is designed as an extension arm which is connected to a tool carrier (18) having at least one working tool (19). They are brought to sweep the floor surface by rotation of the tool carrier around an axis of rotation (17) which is substantially vertical in use. The handle enables movement of the apparatus along the floor surface and is connected to the tool carrier via a pivot shaft (15) which is substantially horizontal in use. The pivot connection (15) of the handle (10) to the tool carrier (18) is located at a distance from the axis (17) of rotation of the tool carrier. A support means (21) for the handle is located at the opposite side of the axis (17) of rotation, relative to the pivot connection of the handle.

Description

FIELD OF THE INVENTION
The present invention relates to an apparatus for working floor surfaces, for example when laying a floor with a thermosetting plastic surface, comprising a handle which is designed as an extension arm which is connected to a tool carrier having at least one working tool for sweeping the floor surface by rotation of the tool carrier around an axis of rotation which is to be substantially vertical in use, and which handle enables movement of the apparatus along the floor surface and is connected to the tool carrier via a pivot shaft which is to be substantially horizontal in use, the pivot connection of the handle to the tool carrier being located at a distance from the axis of rotation of the tool carrier, said apparatus further comprising a support means for the handle to rest upon.
BACKGROUND OF THE INVENTION
Devices according to the above are known and may for example be used for laying an epoxy floor, in order to even out and planish the surface of the sticky, not yet hardened plastic surface, usually after spreading out slip protection upon said surface. These known devices are driven by an electric motor which obtains electric current via a long electric cable from a common mains socket.
The apparatus is handled by an operator equipped with spike shoes which pushes and pulls the apparatus to and fro and sideways, in order to provide an even sweeping of the surface of the floor. At the same time, the operator must ensure that the electric cable does not get into contact with the sticky surface.
Common areas of use are usually large factory premises where the surface may exceed 1000 square meters. The coating of the surface usually must be made over the entire surface in one step, so that no seam will be created.
An example of such an apparatus according to prior art is described in US-A-2,888,863.
Because the prior art apparatus for this object is heavy to handle, it is the cause of stress upon the arms, shoulders and back of the operator.
THE TECHNICAL PROBLEM
One object of the present invention is therefore to provide an apparatus which causes less stress upon the operator and which may be designed as to be saving weight.
THE SOLUTION
For this object, the invention is characterized in that the support means is located at the opposite side of the axis of rotation, relative to the pivot connection of the handle, and that the handle is arranged to be liftable from the support means in use by rotation around the pivot shaft. By this design of the apparatus, the operator may make it move to the left or to the right, merely by lifting or lowering the handle.
In use, the handle preferably extends at an oblique angle to the horizontal plane from its pivot connection, upwards past the axis of rotation of the tool carrier and the support means, to an operator of the apparatus.
The axis of rotation of the tool carrier is preferably carried by a chassis member which also carries the pivot connection of the handle and the support means. This chassis part may also be provided with a drive motor for driving the rotation axis of the tool carrier.
The drive motor is preferably electrical and connected via a cable to a source of electricity which may be one or more electricity accumulators which are being carried by the operator.
DESCRIPTION OF THE DRAWINGS
The invention will be described hereinafter with reference to embodiments that are shown in the enclosed drawings, wherein
Fig. 1
is a plane view of the apparatus according to the invention, and
Fig. 2
is a section along the line II-II in Fig. 1.
DESCRIPTION OF EMBODIMENTS
The apparatus shown in Fig. 1 and 2 comprises a handle 10 which is designed as a T-shaped extension arm having two hand grips 11. The opposite end of the handle 10 as seen from the hand grips is designed as a fork with two shanks 12, which are connected to a rectangular chassis member 13 via projecting horizontal arms 14 which are provided with pivot points 15.
The chassis member 13 is provided with a bearing unit 16 for a vertical rotation shaft 17 belonging to a tool carrier 18 which is designed as a wheel and is provided with a number of scraping iron blades 19. These blades 19 are brought to sweep the floor surface by the rotation of the tool carrier, which is provided by an electric motor 20 which is connected to the axis of rotation 17 by not shown gearing and transmission means.
The chassis member is also provided with a support means 21 for the handle 10 which is located at the opposite side of the axis 17 of rotation, relative to the pivot connection 15 of the handle. Because the pivot connection of the handle to the chassis member 13 is located at a certain distance from the axis 17 of rotation of the tool carrier, the weight of the handle together with the weight of the electric motor 20 in position of use upon a floor surface, will exert a pressure upon the opposite side of the axis 17, as seen from the handle 10. If on the other hand the handle 10 is allowed to rest upon the support means 21, the centre of gravity will be moved from said earlier mentioned position at the pivot points 15, to the support means at the opposite side of the axis of rotation 17.
This shifting of the centre of gravity, from one side to the other side of the axis 17 of rotation, makes it possible for the operator to steer the apparatus in a simple way laterally. In this respect, the apparatus moves to the right in Fig. 1, when the direction of rotation is clockwise in Fig. 1, if the handle is lifted from the support means 21, and to the left in Fig. 1 if the handle is allowed to rest upon the support means. If the direction of rotation is the opposite, the "steering characteristics" will also be the opposite.
According to prior art, by centring the weight and centre of gravity immediately above the axis of rotation of the tool carrier, stability was accomplished at the expense of manageability, so that the apparatus became heavy to control along a floor surface.
According to the invention, an apparatus is provided which is light and by being unstable, has become unexpectedly simple to steer along a floor surface, in such a manner that the apparatus does not risk "running away" to any unwanted direction.
At the same time, the apparatus according to the invention may be designed so light that the drive motor 20 may be of a type so electricity-saving, that the source of energy may be rechargeable batteries which can be carried by the operator, e.g. within a backpack. In this way, it is not necessary to pull an electric cable over an easily damaged, sticky floor surface.
The invention is not limited to the above described embodiment, instead more variants are conceivable within the scope of the following claims. For example, the handle 10, the chassis member 13 and the support means 21 may be designed differently, e.g. in such a way that the pivot points of the handle are located at the operator side of the axis 17 of rotation and the support member at the opposite side, wherein the handle is lifted against the support means when the apparatus is to be moved to one side.

Claims (6)

  1. An apparatus for working floor surfaces, for example when laying a floor with a thermosetting plastic surface, comprising a handle (10) which is designed as an extension arm which is connected to a tool carrier (18) having at least one working tool (19) for sweeping the floor surface by rotation of the tool carrier around an axis of rotation (17) which is to be substantially vertical in use, and which handle enables movement of the apparatus along the floor surface and is connected to the tool carrier via a pivot shaft (15) which is to be substantially horizontal in use, the pivot connection (15) of the handle (10) to the tool carrier (18) being located at a distance from the axis (17) of rotation of the tool carrier, said apparatus further comprising a support means (21) for the handle to rest upon,
    characterized in that the support means (21) is located at the opposite side of the axis (17) of rotation, relative to the pivot connection of the handle, and that the handle (10) is arranged to be liftable from the support means in use by rotation around the pivot shaft (15).
  2. An apparatus according to claim 1,
    characterized in that the handle (10) during use extends at an oblique angle to the horizontal plane from its pivot connection (15), upwards past the axis (17) of rotation of the tool carrier and the support means (21), to an operator of the apparatus.
  3. An apparatus according to claim 1,
    characterized in that the axis (17) of rotation of the tool carrier (18) is carried by a chassis member (13) which also carries the pivot connection (15) of the handle and the support means (21).
  4. An apparatus according to claim 3,
    characterized in that the chassis member is provided with a drive motor (20) for rotation of the rotation axis (17) of the tool carrier.
  5. An apparatus according to claim 4,
    characterized in that the drive motor (20) is electrical and connected via a cable to a source of electricity.
  6. An apparatus according to claim 5,
    characterized in that the source of electricity comprises an electricity accumulator which is to be carried by the operator.
EP96924212A 1995-07-19 1996-06-07 Apparatus for working floor surfaces Expired - Lifetime EP0839243B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9502655 1995-07-19
SE9502655A SE503636C2 (en) 1995-07-19 1995-07-19 Apparatus for machining floor surfaces provided with rotating tools
PCT/SE1996/000751 WO1997004199A1 (en) 1995-07-19 1996-06-07 Apparatus for working floor surfaces

Publications (2)

Publication Number Publication Date
EP0839243A1 EP0839243A1 (en) 1998-05-06
EP0839243B1 true EP0839243B1 (en) 2003-04-09

Family

ID=20399037

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96924212A Expired - Lifetime EP0839243B1 (en) 1995-07-19 1996-06-07 Apparatus for working floor surfaces

Country Status (7)

Country Link
EP (1) EP0839243B1 (en)
AT (1) ATE237053T1 (en)
AU (1) AU6472996A (en)
DE (1) DE69627338T2 (en)
NO (1) NO309204B1 (en)
SE (1) SE503636C2 (en)
WO (1) WO1997004199A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2888863A (en) * 1955-09-09 1959-06-02 George G Eisenbeis Powered rotary trowels
IT946971B (en) * 1971-02-08 1973-05-21 Durst F MACHINE FOR WORKING FLOORS
US5372452A (en) * 1993-02-24 1994-12-13 Hodgson; James A. Power trowels

Also Published As

Publication number Publication date
NO980133D0 (en) 1998-01-13
SE9502655D0 (en) 1995-07-19
AU6472996A (en) 1997-02-18
DE69627338D1 (en) 2003-05-15
EP0839243A1 (en) 1998-05-06
SE9502655L (en) 1996-07-22
NO309204B1 (en) 2000-12-27
NO980133L (en) 1998-02-10
WO1997004199A1 (en) 1997-02-06
DE69627338T2 (en) 2004-04-08
SE503636C2 (en) 1996-07-22
ATE237053T1 (en) 2003-04-15

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