EP0428028A1 - A poker vibrator for compacting concrete - Google Patents

A poker vibrator for compacting concrete Download PDF

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Publication number
EP0428028A1
EP0428028A1 EP90121059A EP90121059A EP0428028A1 EP 0428028 A1 EP0428028 A1 EP 0428028A1 EP 90121059 A EP90121059 A EP 90121059A EP 90121059 A EP90121059 A EP 90121059A EP 0428028 A1 EP0428028 A1 EP 0428028A1
Authority
EP
European Patent Office
Prior art keywords
poker
spring
vibration
casing
insulating element
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.)
Withdrawn
Application number
EP90121059A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jan Andréasson
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.)
Dynapac Compaction Equipment AB
Original Assignee
Dynapac Compaction Equipment 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 Dynapac Compaction Equipment AB filed Critical Dynapac Compaction Equipment AB
Publication of EP0428028A1 publication Critical patent/EP0428028A1/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/06—Solidifying concrete, e.g. by application of vacuum before hardening
    • E04G21/08—Internal vibrators, e.g. needle vibrators

Definitions

  • the present invention relates to a method, and an apparatus for put­ting the method into effect, for insulating vibrations exclusively to the poker in poker vibrators intended for compacting concrete, partly for increasing the energy transmitted by the vibrator to the concrete and partly for eliminating harmful vibrations which, in hand-operated vibrators of the above type, may be transmitted to the operator.
  • 'poker' vibrators are employed for the inner vibration of, for example, concrete and consist of an excentric mass rotatably disposed in a cylindrical casing, the vibration-generating rotational movement being imparted to the excentric mass from, for example, an electric drive motor housed within the poker.
  • poker vibrators of the type contemplated here are classed as hand tools in which the power transmission from the power source to the drive motor disposed within the cylindrical casing of the poker is effected via an electric cable.
  • those casings in which the cable is enclosed are relatively rigid, at least in those portions most proximal the poker where it is held by the operator, which entails that a considerable proportion of the vibrations generated in the poker is also propagated to these portions. It will be apparent to the skilled reader that but a fraction of the energy generated by the poker is utilised for vibrating the concrete, while the rest of the energy is transferred to the power supply means of the poker, i.e. the casing held by the operator.
  • the vibrations transmitted to the casing are often of such magnitude that they may cause injury to the operator, in particular in lengthy exposure times.
  • the object of the present invention is to insulate those vibrations which are generated in the poker to the poker itself and thereby el­iminate the vibrations which are normally propagated to the power supply means of the poker, in accordance with the disclosures of the appended Claims.
  • the amplitude pattern may be drastically modified so that the amplitude is practically equal at both the upper and lower ends of the poker, and so that the ampli­tude is negligeable at the casing of the power supply means. It further follows that the energy supplied to the poker will, to a greater extent than in conventional poker vibrators, be employed for compacting concrete. A further major advantage inherent in the pres­ent invention is that the harmful vibrations transmitted through the casing to the operator are eliminated.
  • Fig. 1 schematically illustrates the dis­tribution of the vibration amplitude 3 about the poker 1 and the casing 2. It will be apparent to the skilled reader that the ampli­tude is greatest at the lower end of the poker and fades linearly towards the upper portion of the poker and then further along the casing. Three-dimensionally, the amplitude along both poker and casing displays conical configuration.
  • Fig. 2 schematically illus­trates the distribution of the vibration amplitude 3 about the poker 1, at the vibration-insulating element 4 and about the casing 2. It will here be apparent that the amplitude but insignificantly fades along the poker because of the vibration-damping element, and that residual amplitude along the casing is of insignificant magnitude. Three-dimensionally, the amplitude along the poker displays a more cylindrical configuration.
  • Fig. 3 illustrates one embodiment of the present invention in which reference numeral 1 designates a vibrator poker, reference numeral 2 a flexible casing surrounding an electric cable 10, and reference numeral 4 a vibration-insulating element which, for example, con­sists of a helical spring secured at its one end to the upper end 6 of the poker 1 by means of a sleeve 5 surrounding the poker and the spring, and secured at its other end to the lower end 8 of the casing by means of a sleeve 7 surrounding the poker and the casing.
  • the spring 4 is not tightly coiled but has a pitch throughout its entire free length which is at least that much larger than its wire diameter that the spring coils cannot touch one another on 900 bending of the spring.
  • the spring rate of the spring is stepwise modified along its free length in that a central portion 4a of the spring is of larger pitch or alternatively smaller diameter, or alternatively larger pitch and smaller diameter, than the neigh­bourlng free portions 4b and 4c.
  • the vibration-insulating element may be of alternative design and construction, for instance be made of a polymer material such as, for example, rubber and be cylindrically designed, with one or more longitudinal conduits for leading an electric cable necessary for driving the poker, and in which a central portion of the rubber body displays larger material thickness than surrounding free portions.
  • Fig. 4 illustrates an alternative embodiment of the present in­vention in which the flexible casing has been replaced by a non-­flexible telescopically adjustable handle portion 9 intended to be used in concrete pouring in which deeper insertions into the con­crete are required, for example in pouring and casting of flooring slabs.
  • this alternative embodiment dis­plays a handle 11 of the easy-grip type for the operator and pro­vided with an integral power switch 13, as well as an additional handle 12 which makes possible two-handed operation.
  • the handle may be electrically heated.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
EP90121059A 1989-11-08 1990-11-02 A poker vibrator for compacting concrete Withdrawn EP0428028A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8903740A SE8903740D0 (sv) 1989-11-08 1989-11-08 Stavvibrator foer betongkomprimering
SE8903740 1989-11-08

Publications (1)

Publication Number Publication Date
EP0428028A1 true EP0428028A1 (en) 1991-05-22

Family

ID=20377415

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90121059A Withdrawn EP0428028A1 (en) 1989-11-08 1990-11-02 A poker vibrator for compacting concrete

Country Status (4)

Country Link
EP (1) EP0428028A1 (no)
FI (1) FI905520A0 (no)
NO (1) NO904844L (no)
SE (1) SE8903740D0 (no)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997046775A1 (fr) * 1996-06-05 1997-12-11 Daniel Forest Vibrateur a aiguille portatif
WO1998021429A1 (de) * 1996-11-11 1998-05-22 Otto Heinzle Vorrichtung zum verdichten von beton in einer schalung
DE10106136A1 (de) * 2001-02-10 2002-08-14 Erwin Roeder Rüttler-Anordnung
CN105822069A (zh) * 2016-04-27 2016-08-03 成都绿迪科技有限公司 一种混凝土振捣器
USD1000927S1 (en) 2021-04-22 2023-10-10 Milwaukee Electric Tool Corporation Concrete vibrator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1947941A (en) * 1932-09-06 1934-02-20 Jackson Corwill Apparatus for treating concrete and like plastic materials
US3782693A (en) * 1971-03-27 1974-01-01 Bosch Gmbh Robert Vibratory compactor
US4086970A (en) * 1976-04-23 1978-05-02 Sakura Denki Kabushiki Kaisha Vibration absorbing device for portable vibrators
US4135826A (en) * 1977-04-11 1979-01-23 Holm Harold K Vibrators

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1947941A (en) * 1932-09-06 1934-02-20 Jackson Corwill Apparatus for treating concrete and like plastic materials
US3782693A (en) * 1971-03-27 1974-01-01 Bosch Gmbh Robert Vibratory compactor
US4086970A (en) * 1976-04-23 1978-05-02 Sakura Denki Kabushiki Kaisha Vibration absorbing device for portable vibrators
US4135826A (en) * 1977-04-11 1979-01-23 Holm Harold K Vibrators

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DERWENT'S ABSTRACT No. A79923/49, SU 899 356 (Staytsev N.A.), 27 January 1982 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997046775A1 (fr) * 1996-06-05 1997-12-11 Daniel Forest Vibrateur a aiguille portatif
FR2749602A1 (fr) * 1996-06-05 1997-12-12 Forest Daniel Vibrateur a aiguille portatif
WO1998021429A1 (de) * 1996-11-11 1998-05-22 Otto Heinzle Vorrichtung zum verdichten von beton in einer schalung
DE10106136A1 (de) * 2001-02-10 2002-08-14 Erwin Roeder Rüttler-Anordnung
CN105822069A (zh) * 2016-04-27 2016-08-03 成都绿迪科技有限公司 一种混凝土振捣器
USD1000927S1 (en) 2021-04-22 2023-10-10 Milwaukee Electric Tool Corporation Concrete vibrator

Also Published As

Publication number Publication date
SE8903740D0 (sv) 1989-11-08
NO904844D0 (no) 1990-11-07
FI905520A0 (fi) 1990-11-07
NO904844L (no) 1991-05-10

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