US3367250A - Concrete surfacing machine - Google Patents

Concrete surfacing machine Download PDF

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Publication number
US3367250A
US3367250A US522528A US52252866A US3367250A US 3367250 A US3367250 A US 3367250A US 522528 A US522528 A US 522528A US 52252866 A US52252866 A US 52252866A US 3367250 A US3367250 A US 3367250A
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US
United States
Prior art keywords
speed
concrete
trowelling
engine
machine
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
US522528A
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English (en)
Inventor
Robert F Ytterberg
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.)
Kalman Floor Co Inc
Kalman Floor Co
Original Assignee
Kalman Floor Co
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 Kalman Floor Co filed Critical Kalman Floor Co
Priority to US522528A priority Critical patent/US3367250A/en
Priority to ES0335719A priority patent/ES335719A1/es
Priority to DE19671684314 priority patent/DE1684314C/de
Priority to GB2509/67A priority patent/GB1118386A/en
Priority to NL676701035A priority patent/NL150870B/xx
Priority to DK39167AA priority patent/DK117862B/da
Priority to BE693023D priority patent/BE693023A/xx
Priority to FR92175A priority patent/FR1511721A/fr
Priority to SE01057/67A priority patent/SE335219B/xx
Priority to NO166545A priority patent/NO117814B/no
Application granted granted Critical
Publication of US3367250A publication Critical patent/US3367250A/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

  • An improved concrete surfacing apparatus comprising a gasoline operated engine for rotating a trowelling member, an electric generator or alternator driven by the engine to produce a voltage proportional to the speed of the engine, and electrically operated vibrator means mounted on the trowelling member to produce a vibration of the trowelling member having a variable frequency and amplitude of vibration which is proportional to the generator voltage output.
  • the trowelling member is thereby caused to vibrate in synchronism with its adjustable speed of rotation.
  • the trowelling member may consist of a single disc, or a combination of discs, or a plurality of blade elements.
  • This invention relates to machines for finishing concrete surfaces and, more particularly, it relates to improved machines of the type that have trowelling means for working the concrete surface rotated at relatively low speeds such as 200 r.p.m. and vibrated simultaneously at relatively high speeds such as 3,600 r.p.m.
  • a general object of the invention is to provide improved floor surfacing machines.
  • the vibrator on a trowelling or surfacing member such as a set of blades or discs rotated from a master drive motor or engine is used in accordance with this invention to even out the variations of concrete wetness over a floor surface.
  • This mode of operation may be contrasted to prior art vibrator operation set at an operation frequency to achieve maximum vibration, or to achieve acceptable average performance throughout the surface for different kinds of concrete or variations in surface thickness, etc.
  • vibrators in the prior art had a limited range of performance.
  • an electric vibrator as provided by Davis Patent 2,395,399 which had a variable control for selecting the effective vibrator power, there is a limited operational range of variable control because the power line voltage volts) can only be reduced, and limitations are imposed on maximum power available.
  • the machine configuration of this invention provides for a large control range of vibrator power which is synchronously selected to track with the rotational speed of the trowelling means which, by necessity, the operator adjusts as he encounters relatively dry and wet regions of the surface.
  • This is accomplished with a gasoline engine prime mover for rotating the trowelling means under control of a throttle for speed adjustment, in combination with variable speed voltage responsive trowel vibrator means which is driven from an electric generator coupled with the gasoline engine to give a wide range of voltage variations as the engine speed varies.
  • FIGURE 1 is an elevation view of a floor surfacing machine afforded by this invention
  • FIGURE 2 is an elevation view from one side, partly broken away in section of the floor surfacing machine
  • FIGURE 3 is an expanded view, partly in section of a slip-ring assembly for conveying electric power between the stationary and rotating portions of the machine;
  • FIGURE 4 is a schematic diagram of the electric circuit for supplying vibrator power.
  • FIGURES l and 2 show a floor surfacing machine operable with disc trowelling means 10 rotatable from the gasoline engine prime mover 11 at typical speeds in the order of S0 to 300 r.p.m.
  • This drive speed is attained from an engine speed such as 1,500-4,500 r.p.m. by way of gear box 20 belt driven through pulley 21 from the gasoline engine pulley shaft 22 when the engine speed 3 exceeds that required by an intermediate speed responsive clutch 23.
  • the trowelling means may be in the form of blades if desirable, but it is pertinent that high speed electric vibrating means in the form of one or more variable speed devices 12 (in this case, three) are distributed about the trowelling means to provide substantially uniform vibrations thereover in a frequency range of from 3,600 to 12,000 r.p.m., for example.
  • Each of these shown in this embodiment is a series wound AC-DC universal motor driving an internal eccentric cam member 13.
  • rubber shock bushings 14 couple the trowelling disc 10 to the rotating shaft 15 driven by the engine 11.
  • a handle is extended by dual shafts 16 from the machine for operator manipulation of the machine position. Also, both a control cable 17 for the gasoline engine throttle and a pair of electrical wires 18 for switch control of the vibrator means is extended to the handle for control by the operator.
  • a variable voltage generator 25 is mounted on the engine block member 26 for belt drive through pulley 27 on the generator from pulley 28 on the engine at the opposite end of shaft 22 from pulley 29.
  • This generator supplies power to the electric vibrators 12 rather than a remote power source through an intermediate electric power cord as provided in the prior art. This not only makes the machine easily portable without dependence upon accessibility to power lines, but also the operational speed of the vibrators can be made independent of other load ing on the power lines or losses in cables as frequently encountered at construction sites.
  • Power to the vibrators 12 is supplied through a short cable interconnected by plug assembly 30 to a slipring unit 31 .as shown in the broken away portion of FIG- URE 3.
  • This slipring assembly is required to transmit electric power from the stationary generator 25 to the vibrators 12 which are mounted on the rotating trowelling disc 10.
  • the insulating cap 40 rotates with the trowelling disc to convey current from two sliprings 41, 42 by way of brushes 43, 4 to corresponding terminals 45, 46.
  • the stationary insulation shoulder 47 is provided with terminal bolts 48 or leads 49 from each slipring 41, 42 which in turn are connected by a cable (not shown) to the output terminals of the generator 25.
  • each of the three vibrators 12, 12, etc. is connected through a plug 30 and slipring 41, 42 to the handle switch 50 which connects the vibrators to the generator 25 power source.
  • the gasoline engine prime mover operates both the vibrators 12 and the trowelling disc 10 in substantial synchronism as the engine speed is controlled by the operator, so that as the trowelling disc varies in speed over the range 50 to 300 r.p.m. for example, the generator supplies a voltage in the order of 30 to 190 volts.
  • This upper limit is in excess of that attainable from a 110-volt constant voltage line and thus the range of energy supplied by the vibrator is greatly enlarged over a corresponding rheostat line control which, furthermore, could not provide the desired automatic following of corresponding trowel and vibrator speeds as the combination herein provided.
  • an alternating or direct current generator with the voltage ranges specified can serve to produce a surfacing machine capable of handling a wide range of dryness variations in a floor surface without special processing or special operator skills.
  • a machine for surfacing concrete fioors comprising trowelling means resting upon the surface of a freshly deposited concrete floor having different areas therein of relatively dry and wet concrete mix, a variabe speed gasoline drive engine rotating said trowelling means at a speed in the order of 50 to 300 r.p.m.
  • variable-speed voltage-responsive 110 volt electric motor including eccentric means mounted on said trowelling means for vibrating said trowelling means at a high frequency in the order of above 3,600 r.p.m., a variable voltage generator driven by said gasoline drive engine and responsive to variations in its speed to provide a voltage output range of the order of 30 to volts over the speed range of said gasoline drive engine, and an electrical circuit selectively coupling the generator voltage to said electric motor to vary the electric motor speed as a function of the gasoline motor speed effected by said throttle such that an operator in adjusting the gasoline engine speed at a relatively low speed for wet concrete floor areas automatically selects less vibrator energy to drive out water from the concrete mix than when the motor speed is increased for relatively dry concrete floor areas where greater vibrator energy derived as a result of the greater electric motor speed serves to derive enough water from the dry concrete to produce a moist lubricant concrete paste near the floor surface serving to improve the operational efficiency of the trowelling means.
  • a variable speed electric motor positioned on the trowelling means and coupled to eccentric means to vibrate the trowelling means at a high frequency of at least 3,600 r.p.m. dependent upon the voltage to the motor, a variable voltage generator driven by theengine to produce a voltage proportional to the speed of the gasoline engine, and a slipring assembly coupling the generator voltage to the electric motor to establish a vibration frequency proportional to the speed of the trowelling means.
  • a machine for surfacing fresh concrete floors com prising in combination, rotary trowel means, a variable speed engine driving the trowel means, an electric generator driven by said engine to produce a voltage proportional to the speed of said engine, an electric vibrator means on said trowel means coupled to be driven by the electric generator to produce a frequency and a1nplitude of vibration proportional to the generator voltage.
  • said trowel speed of the engine, and the vibrator means comprise at means comprises a plurality of blade-like elements. least one series wound D-C electric motor with an eccentric cam rotated thereby.
  • References Cited 5 A machine as defined in claim 3 wherein the elec- 5 UNITED STATES PATENTS tric generator is an alternator and the vibrator means 2,386,843 10/1945 Davis is an electromagnetic device having a vibration frequency 2,395,399 10/1945 Davis dependent upon the frequency of the alternator. 3 0 5 4 12 19 2 Morolin et aL 95 45 6.
  • said trowel means comprises at least one disc-shaped element. 10 JACOB L. NACKENOFF, Primary Examiner.

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)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Disintegrating Or Milling (AREA)
US522528A 1966-01-24 1966-01-24 Concrete surfacing machine Expired - Lifetime US3367250A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US522528A US3367250A (en) 1966-01-24 1966-01-24 Concrete surfacing machine
ES0335719A ES335719A1 (es) 1966-01-24 1967-01-16 Una maquina para trabajar superficies de suelos de hormigon.
GB2509/67A GB1118386A (en) 1966-01-24 1967-01-17 Improved concrete surfacing machine
DE19671684314 DE1684314C (de) 1966-01-24 1967-01-17 Betonflächenglättmaschine
NL676701035A NL150870B (nl) 1966-01-24 1967-01-23 Machine voor het afwerken van betonvloeren.
DK39167AA DK117862B (da) 1966-01-24 1967-01-23 Maskine til overfladebehandling af nyudstøbte betongulve.
BE693023D BE693023A (en)van) 1966-01-24 1967-01-23
FR92175A FR1511721A (fr) 1966-01-24 1967-01-23 Machine perfectionnée à surfacer le béton
SE01057/67A SE335219B (en)van) 1966-01-24 1967-01-24
NO166545A NO117814B (en)van) 1966-01-24 1967-01-24

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US522528A US3367250A (en) 1966-01-24 1966-01-24 Concrete surfacing machine

Publications (1)

Publication Number Publication Date
US3367250A true US3367250A (en) 1968-02-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
US522528A Expired - Lifetime US3367250A (en) 1966-01-24 1966-01-24 Concrete surfacing machine

Country Status (9)

Country Link
US (1) US3367250A (en)van)
BE (1) BE693023A (en)van)
DK (1) DK117862B (en)van)
ES (1) ES335719A1 (en)van)
FR (1) FR1511721A (en)van)
GB (1) GB1118386A (en)van)
NL (1) NL150870B (en)van)
NO (1) NO117814B (en)van)
SE (1) SE335219B (en)van)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3972637A (en) * 1975-07-31 1976-08-03 Sutherland John W Reversible self-propelled plate compactor
US4848960A (en) * 1987-04-15 1989-07-18 Shimizu Construction Company Limited Finishing machine for a concrete surface
US20070074697A1 (en) * 2003-10-28 2007-04-05 Nielsen Ib H Centralised lubrication of large diesel engines
WO2018231881A3 (en) * 2017-06-12 2019-01-24 Multiquip, Inc. HYBRID TRANSMISSION FOR AUTOPROPULSED SLICER
CN115383869A (zh) * 2022-09-26 2022-11-25 中国十七冶集团有限公司 一种混凝土预制件的养护装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2735805B1 (fr) * 1995-06-26 1997-09-05 Serra Jean Pierre Henri Vibro-compacteur rotatif pour mortier de resine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2386843A (en) * 1941-12-03 1945-10-16 Kalman Floor Co Apparatus for surfacing plastic bodies
US2395399A (en) * 1942-09-26 1946-02-26 Kalman Floor Co Machine for surfacing concrete
US3066584A (en) * 1957-09-09 1962-12-04 Kalman Floor Co Cement finishing machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2386843A (en) * 1941-12-03 1945-10-16 Kalman Floor Co Apparatus for surfacing plastic bodies
US2395399A (en) * 1942-09-26 1946-02-26 Kalman Floor Co Machine for surfacing concrete
US3066584A (en) * 1957-09-09 1962-12-04 Kalman Floor Co Cement finishing machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3972637A (en) * 1975-07-31 1976-08-03 Sutherland John W Reversible self-propelled plate compactor
US4848960A (en) * 1987-04-15 1989-07-18 Shimizu Construction Company Limited Finishing machine for a concrete surface
US20070074697A1 (en) * 2003-10-28 2007-04-05 Nielsen Ib H Centralised lubrication of large diesel engines
US7806099B2 (en) * 2003-10-28 2010-10-05 Hans Jensen Lubricators A/S Centralised lubrication of large diesel engines
US20110067670A1 (en) * 2003-10-28 2011-03-24 Ib Helmer Nielsen Centralised lubrication of large diesel engines
US8156917B2 (en) * 2003-10-28 2012-04-17 Hans Jensen Lubricators A/S Centralised lubrication of large diesel engines
WO2018231881A3 (en) * 2017-06-12 2019-01-24 Multiquip, Inc. HYBRID TRANSMISSION FOR AUTOPROPULSED SLICER
CN115383869A (zh) * 2022-09-26 2022-11-25 中国十七冶集团有限公司 一种混凝土预制件的养护装置

Also Published As

Publication number Publication date
GB1118386A (en) 1968-07-03
DE1684314A1 (de) 1971-10-14
ES335719A1 (es) 1967-12-16
NL150870B (nl) 1976-09-15
NL6701035A (en)van) 1967-07-25
NO117814B (en)van) 1969-09-29
DK117862B (da) 1970-06-08
FR1511721A (fr) 1968-02-02
SE335219B (en)van) 1971-05-17
BE693023A (en)van) 1967-07-24

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