WO2022182820A1 - Truelle à béton - Google Patents

Truelle à béton Download PDF

Info

Publication number
WO2022182820A1
WO2022182820A1 PCT/US2022/017621 US2022017621W WO2022182820A1 WO 2022182820 A1 WO2022182820 A1 WO 2022182820A1 US 2022017621 W US2022017621 W US 2022017621W WO 2022182820 A1 WO2022182820 A1 WO 2022182820A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
concrete trowel
blade
motor
trowel
Prior art date
Application number
PCT/US2022/017621
Other languages
English (en)
Inventor
Ian C. RICHARDS
Original Assignee
Milwaukee Electric Tool Corporation
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 Milwaukee Electric Tool Corporation filed Critical Milwaukee Electric Tool Corporation
Publication of WO2022182820A1 publication Critical patent/WO2022182820A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/42—Machines for imparting a smooth finish to freshly-laid paving courses other than by rolling, tamping or vibrating
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F21/00—Implements for finishing work on buildings
    • E04F21/02—Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
    • E04F21/16—Implements for after-treatment of plaster or the like before it has hardened or dried, e.g. smoothing-tools, profile trowels
    • E04F21/161—Trowels
    • E04F21/163—Trowels with exchangeable blades

Definitions

  • the present invention relates to powered concrete trowels, and more particularly to battery powered concrete finishing trowels.
  • Powered concrete trowels are typically used for finishing concrete surfaces and generally include a gas-powered motor mounted on a frame or “cage” that surrounds a rotor having a plurality of concrete trowel blades.
  • the rotor is rotatably driven by the motor, which rotates the blades on a concrete surface.
  • the trowel is controlled by an operator via a handle extending from the cage.
  • Most concrete trowels include a single set of rotating blades that are attached to radially spaced apart arms extending from the rotor via a plurality of fasteners, such as bolts.
  • these blades are combination blades having a leading edge that is pitched upward so that it doesn’t damage freshly laid concrete, and a trailing edge that is flat for finishing the concrete surface.
  • the trailing, or finishing edge can incur a lot of wear due to repeatedly striking the concrete surface, which can cause unwanted burnish marks on the finished concrete surface.
  • an operator would have to stop and either replace the trowel blade or hand finish the burnished surface. This is both time consuming and costly.
  • the present invention provides, in one aspect, a concrete trowel including a frame, a drive assembly including a motor mounted on the frame and a drive hub configured to receive torque from the motor, and a rotor rotatable about a rotational axis.
  • the rotor includes a rotor hub coupled for co-rotation with the drive hub, a plurality of rotor arms radially extending from the rotor hub, and a plurality of blades selectively attached on respective rotor arms by a quick-connect mounting system.
  • the present invention provides, in another aspect, a concrete trowel including a frame, a drive assembly including a motor mounted on the frame and a drive hub configured to receive torque from the motor, and a rotor rotatable about a rotational axis.
  • the rotor includes a rotor hub coupled for co-rotation with the drive hub, a plurality of rotor arms radially extending from the rotor hub, and a plurality of blades mounted on the plurality of rotor arms, each blade including a main blade body and a removable trailing edge portion.
  • a concrete trowel in another aspect of the present invention, includes a frame, a drive assembly including a motor mounted on the frame and a drive hub configured to receive torque from the motor, a rotor rotatable about a rotational axis, the rotor including a rotor hub coupled for co-rotation with the drive hub, a plurality of rotor arms radially extending from the rotor hub, and a multi-piece blade selectively attached to each of the rotor arms by a quick-connect mounting system.
  • Each multi-piece blade includes a blade body and a removable trailing edge portion selectively attached to the blade body.
  • FIG. 1 is perspective view of a concrete trowel according to an embodiment of the invention.
  • FIG. 2 is a side, partial cutaway view of the concrete trowel of FIG. 1.
  • FIG. 3 A is a top, schematic view of a rotor having a plurality of blades in accordance with an embodiment of the invention for use with the trowel of FIG. 1.
  • FIG. 3B is a cross-section view of a blade taken along line 3B-3B in FIG. 3 A.
  • FIG. 4A is side view of an alternative blade in accordance with an embodiment of the invention for use with the trowel of FIG. 1.
  • FIG. 4B is a top view of the blade of FIG. 4A.
  • FIG. 1 illustrates a concrete trowel 10 including frame 12 having a blade guard
  • a drive assembly 26 mounted on the frame 12 having a motor 30 (e.g., a brushless direct current electric motor) with an output shaft 32 extending from the motor 30 (FIG. 2), and a gear box 38 coupled to the motor 30 having a drive hub 42.
  • the drive assembly 26 is powered by a battery pack 46 supported by the frame 12 and in selective electrical communication with the motor 30 to provide electrical power to the motor 30.
  • the battery pack 46 and the motor 30 can be configured as an 80 Volt high power battery pack 46 and motor 30, such as the 80 Volt battery pack and motor disclosed in U.S. Patent Application No. 16/025,491 filed on July 2, 2018 (now U.S.
  • the motor 30 may be a combustion engine and in such a case, in lieu of a battery pack 46, the concrete trowel 10 may include a fuel cell and a fuel injection system, or carburetion system, in fluid communication with the motor 30.
  • the motor 30 is configured to supply torque to the drive hub 42 of the gear box 38 via the output shaft 32, rotatably driving the rotor 18 to rotate the plurality of blades 22.
  • the concrete trowel 10 further includes a controller 50 (including, amongst other components, a printed circuit board having one or more microprocessors and multiple field-effect transducers for driving the motor 30), a blade adjustment yoke 54 pivotably coupled to the drive hub 42, and a handle assembly 58 including a post 62 extending obliquely from the blade guard 14 and handlebars 66 coupled to the post 62.
  • the handle assembly 58 further includes an operator control unit 70 mounted on one of the handlebars 66 having a plurality of operator controls (e.g., an ON/OFF switch 71, a speed adjustment switch 73, etc.) for providing an input signal to the controller 50, and a blade pitch adjustment knob 74 having an adjustment cable 78 coupled to the blade adjustment yoke 54.
  • the blade pitch adjustment knob 74 is configured to selectively tension the adjustment cable 78, thereby pivoting the adjustment yoke 54 with respect to the drive hub 42, which adjusts the pitch of the blades 22 relative to a work surface 33.
  • the drive assembly 26 can be a direct drive system where the output shaft 32 is directly connected to the drive hub 42 to rotatably drive the rotor 18.
  • the rotor 18 also includes a centrally located rotor hub 82 that is coupled for co-rotation with the drive hub 42 and a plurality of arms 86 radially extending from the rotor hub 82 to which one of the blades 22 is mounted.
  • Each of the blades 22 is a multi-piece blade that includes blade body 88 having a curved leading edge portion 90 that allows the blade 22 to slide over the concrete surface and a plurality of quick- connect mounting portions 98 (e.g., over-center cam locks, or other fasteners such as, bolts, screws, etc.) affixed, or otherwise attached, to the blade body 88 for selectively, or removably, mounting the blades 22 to their respective arms 86. Further each of the blades 22 includes a flat, removable trailing edge portion 94 for smoothing out the concrete surface.
  • quick- connect mounting portions 98 e.g., over-center cam locks, or other fasteners such as, bolts, screws, etc.
  • the blade body 88 of each blade further includes a front longitudinal edge 100 coincident with the leading edge portion 90, an opposite, rear longitudinal edge 102 to which the trailing edge portion 94 is connectable, and a plurality of quick-connect couplings 106 (e.g., over center cam locks, ball detents, magnets, etc.) for selectively mounting the removable trailing edge portion 94 to each of the blade bodies 88 of the respective blades 22.
  • the removable trailing edge portions 94 can be located along the rear longitudinal edge 102 of each of the blade bodies 88 of the respective blades 22 using a locating, or alignment, feature such as a tongue 106 and groove 108, locating dowels, a combination thereof, or any other conventional means known by someone having ordinary skill in the art.
  • 3B shows the groove 108 formed on the removable trailing edge portion 94 and the tongue 106 formed on the blade body 88, but it is to be understood that these parts may be reversed such that the groove is formed on the blade body 88 and the tongue is formed on the removable trailing edge portion 94.
  • the operator releases the quick-connect couplings 106 on the selected blade 22, which allows the operator to remove the worn trailing edge portion 94 and replace it with a new trailing edge portion 94 to the same blade 22.
  • the quick-connect couplings 106 are thereafter returned to a locked state to secure the new trailing edge portion 94 to the blade body 88 of the particular blade 22.
  • the trowel blades 22 and removable trailing edge portions 94 can be made from any suitable material, for example, steel with or without additives, ceramic materials, or a combination thereof. In other embodiments, a coating may be applied to the trowel blades 22 and/or removable trailing edge portions 94 in order to reduce wear and corrosion.
  • FIGS. 4 A and 4B illustrate an alternative embodiment of a trowel blade 23 that can be mounted on the rotor arms 86.
  • the trowel blade 23 is formed as continuous generally rectangular body including a curved leading edge portion 91 for gliding over the concrete surface and a flat, trailing edge portion 95 for smoothing the concrete surface.
  • the trowel blade 23 further includes a quick-connect mounting system 99 to secure the blade 23 to a respective rotor arm 86, permitting the entire blade 23 to be quickly attached and removed from the rotor arm 86.
  • the quick-connect mounting system 99 is toolless (e.g., an over-center cam lock).
  • the quick-connect mounting system 99 can require the usage of tools, such as a wrench, screwdriver, etc.
  • the trowel blade 23 can be made from any suitable material, for example, steel with or without additives, ceramic materials, or a combination thereof, and each of these materials may include a coating that reduces wear and corrosion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Abstract

L'invention concerne une truelle à béton qui comprend un cadre, un ensemble d'entraînement comprenant un moteur monté sur le cadre et un moyeu d'entraînement configuré pour recevoir un couple provenant du moteur et un rotor pouvant tourner autour d'un axe de rotation. Le rotor comprend un moyeu de rotor accouplé pour tourner conjointement avec le moyeu d'entraînement, une pluralité de bras de rotor s'étendant radialement à partir du moyeu de rotor, et une pluralité de pales fixées de manière sélective sur des bras de rotor respectifs par un système de montage à raccordement rapide.
PCT/US2022/017621 2021-02-24 2022-02-24 Truelle à béton WO2022182820A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202163153054P 2021-02-24 2021-02-24
US63/153,054 2021-02-24

Publications (1)

Publication Number Publication Date
WO2022182820A1 true WO2022182820A1 (fr) 2022-09-01

Family

ID=82901575

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2022/017621 WO2022182820A1 (fr) 2021-02-24 2022-02-24 Truelle à béton

Country Status (2)

Country Link
US (1) US20220267968A1 (fr)
WO (1) WO2022182820A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022182817A1 (fr) * 2021-02-24 2022-09-01 Milwaukee Electric Tool Corporation Truelle en béton

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2662454A (en) * 1948-04-12 1953-12-15 Whiteman Marvin Edwin Float trowel for cement floor finishers
JPH0893212A (ja) * 1994-09-27 1996-04-09 Yoshio Naruse 回転式動力鏝の鏝板取付け構造
US5567503A (en) * 1992-03-16 1996-10-22 Sexton; John S. Polishing pad with abrasive particles in a non-porous binder
JP3039124U (ja) * 1996-12-27 1997-07-11 菊池機工株式会社 充電式回転鏝
EP0887489A1 (fr) * 1997-06-18 1998-12-30 Richard A. Dhont Dispositif pour le finissage des sols et une lame pouvant être utilisée avec celui-ci

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2662454A (en) * 1948-04-12 1953-12-15 Whiteman Marvin Edwin Float trowel for cement floor finishers
US5567503A (en) * 1992-03-16 1996-10-22 Sexton; John S. Polishing pad with abrasive particles in a non-porous binder
JPH0893212A (ja) * 1994-09-27 1996-04-09 Yoshio Naruse 回転式動力鏝の鏝板取付け構造
JP3039124U (ja) * 1996-12-27 1997-07-11 菊池機工株式会社 充電式回転鏝
EP0887489A1 (fr) * 1997-06-18 1998-12-30 Richard A. Dhont Dispositif pour le finissage des sols et une lame pouvant être utilisée avec celui-ci

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US20220267968A1 (en) 2022-08-25

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