WO1981002593A1 - Control for plate vibrators - Google Patents

Control for plate vibrators Download PDF

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Publication number
WO1981002593A1
WO1981002593A1 PCT/SE1981/000020 SE8100020W WO8102593A1 WO 1981002593 A1 WO1981002593 A1 WO 1981002593A1 SE 8100020 W SE8100020 W SE 8100020W WO 8102593 A1 WO8102593 A1 WO 8102593A1
Authority
WO
WIPO (PCT)
Prior art keywords
control
hub
shaft
secured
wire
Prior art date
Application number
PCT/SE1981/000020
Other languages
French (fr)
Inventor
G Grane
Original Assignee
Dynapac Maskin Ab
G Grane
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 Maskin Ab, G Grane filed Critical Dynapac Maskin Ab
Priority to DE3137614T priority Critical patent/DE3137614C2/en
Priority to BR8108737A priority patent/BR8108737A/en
Publication of WO1981002593A1 publication Critical patent/WO1981002593A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • 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
    • E01C19/30—Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elements
    • E01C19/34—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight
    • E01C19/38—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight with means specifically for generating vibrations, e.g. vibrating plate compactors, immersion vibrators
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02—Improving by compacting
    • E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
    • E02D3/074—Vibrating apparatus operating with systems involving rotary unbalanced masses
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G7/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with one single controlled member; Details thereof
    • G05G7/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with one single controlled member; Details thereof characterised by special provisions for conveying or converting motion, or for acting at a distance

Definitions

  • the purpose of the present invention is to achieve a control for plate vibrators by means of which the direction of the vibrational force generated by the vibrating element of the plate vibrator can be steplessly varied and set in the desired position.
  • a known method of changing the direction of the vibrational force is by changing the phase position of the rotating eccentric weights in relation to each other for the purpose of causing the plate vibrator to move in a forward or reverse direction.
  • Plate vibrators of the type in question are used for compacting sand, gravel and similar materials and are often used as auxiliary units to supplement larger compaction machines on roadworks etc.
  • su.ch plates are suitable for compaction work in pipe trenches and similar confined spaces where the scope for manoeuvring a plate which is capable of moving in only one direction is limited. It is important that reversal of the direction of movement of the plate can be achieved partly in a simple and practical manner as far as the operator is concerned and partly so that the desired speed control position for moving forward and in reverse respectively can be set and maintained without inconvenience to the operator.
  • the purpose of the invention is to achieve a control for changing the direction of the vibrational force, whereby resetting the vibrating element by means of the control is achieved by means of a wire arranged between the control and the adjusting mechanism of the element.
  • control in accordance with the invention is particularly suitable for vibrating elements of the type described in Swedish patent No. (Swedish patent application No.7609352-5 ), for example.
  • This type of vibrating element consists of at least two contra-rotating eccentric weights connected to each other via gears for the purpose of resetting the phase position of the eccentric weights in relation to each other while in operation, whereby one of the eccentric weights is arranged to pivot in relation to the rotational shaft of the vibrating element and driving of the adjustable eccentric is accomplished from the rotational shaft via a gear transmission which embraces an adjusting mechanism equipped with a pulley which is arranged to be rotated by means of a wire wound round the pulley for resetting the adjusting mechanism imparting a rotating movement to it.
  • the vibrating element is so designed that while in operation it automatically adjusts itself so that the vibrational force generated by the element imparts to the plate vibrator a maximum translation speed in the forward direction.
  • the control consists of a hub around which the resetting wire is wound and secured. Fixed to the hub is a control lever by means of which the hub can be rotated. By moving the lever in one or the other direction the wire can be wound round the hub and unwound from it respectively. Pulling on the wire results in a rotation of the adjusting mechanism and consequently a change in the translation speed of the plate. If the lever is released the adjusting mechanism automatically returns to the position at which maximum translation movement in a forward direction is obtained.
  • the pulling force exerted by the element on the wire as long as it is in operation is comparatively large. However, this can be overcome without much difficulty by means of the control lever
  • the driver In order to cause the plate to move in reverse or in a forward direction at a slower speed than maximum the driver must, however, continuously hold the lever in the desired speed position which may be tiring at length.
  • a spiral spring is mounted in accordance with the invention on the hub of the control so that it exerts a turning force on the hub acting in the opposite direction to the moment of the pulling force of the vibrating element on the wire. The spiral spring is thereby so tensioned that the force generated by the spring eliminates that caused by the element.
  • control lever Owing to the continuous vibration to which control and spring are exposed, and also on account of differences between the properties of the springs, the control lever may under certain circumstances move out of its set speed position.
  • a friction brake is therefore arranged on the hub, the purpose of which is to hold it in place on application and thereby the speed position set on the control .
  • the combination of tensioned spring and brake with adjustable application in accordance with the invention permits arbitrary regulation of the control function.
  • the spiral spring is tensioned to exert a force in the hub which does not entirely counteract the force caused by the vibrating element, the operator must continuously hold the control lever in the desired speed position so that it does not return to the position at which maximum forward speed is obtained.
  • the force in the lever is not so great that it causes major inconvenience to the driver for shorter periods.
  • the advantage gained is that if the operator when driving in reverse, for example, trips and is consequently forced to release the lever, the plate automatically goes into the forward direction mode. This may be particularly advantageous when compacting in pipe trenches and other confined spaces.
  • Fig. 1 shows a version of the control viewed from the side
  • Fig. 2 a cross-section through the line
  • FIG. 4 shows a suitable vibrating element on which the control according to the invention is practically applicable.
  • the control consists of a hub 1 which is arranged to pivot on a shaft 2 mounted on the control handle of the plate vibrator.
  • the hub is caused to rotate about its axis by means of a control handle 3 fixed to the hub.
  • Wound round the hub is a wire 4, one end of which is connected to and wound round (not shown) a pulley 5, Fig. 4, incorporated in the adjusting mechanism of the eccentric element.
  • the other end of the wire is secured to hub 1 by means of a retaining screw 6.
  • the eccentric element exerts a constant pulling force on wire 4 and thereby gives rise to a turning force on hub 1.
  • the hub is fitted with a spiral spring 7, one end 8 of which is secured to a disc 9 which comprises an integral part of hub 1.
  • the other end 10 of spring 7 is secured to the rotational shaft
  • hub 1 is equipped with a friction brake.
  • This consists of cup springs 11 which are mounted in pairs on shaft 2 at each end of hub 1.
  • the cup springs are tensioned by means of a nut 12 screwed onto shaft 2, the nut being held in position by a locknut 13.
  • the cup springs 11 are tensioned between it and the end of the hub and between the other end of the hub and a shoulder 14 on shaft 2. The desired application of the friction brake is obtained in this manner.
  • Shaft 2 is secured to a bracket 15 on the control handle of the plate vibrator by means of a screw connection 16. It is so mounted that when screw 16 is slackened, shaft 2 can be rotated in relation to hub 1, whereby spring 7 can be tensioned by the desired amount.
  • the control is built into a casing 7 secured to the control handle of the plate vibrator. Arranged inside it is a stop 18 for two studs 19 and 20 arranged on hub disc 9. In the reverse direction position of the control stud 19 rests against stop 18 and in the forward direction position stud 20 rests against it.
  • the eccentric element shown in Fig. 4 consists of a housing 101 in which rotatable shaft 102 is journalled and on which shaft an eccentricwaight 102 is secured.
  • the shaft is journalled in bearings 104 and 105 and is caused to rotate by means of pulley 106 which is shaped as an eccentric weight and secured to one end of the shaft.
  • an eccentric weight 107 is journalled so as to rotate in bearing 108 and by means of a gear transmission interacting with shaft 102 the weight is caused to rotate in the opposite direction to and with the same rotational speed as eccentric weights 103 and 106.
  • the gear transmission consists of a gear 109. rigidly secured to shaft 102, this gear meshing with a gear 110 via a gear that is not shown.
  • Another gear 111 is rigidly secured to the same shaft as gear 110 and this gear meshes with gear 112 which is rigidly secured to eccentric weight 107.
  • the pulley 5 By pulling on wire 4 the pulley 5 is caused to rotate and with it a gear segment 113 mounted on the shaft of the pulley, the gear segment interacting via a gear flange 114 and an adjusting arm 115 with the gear transmission for the eccentric weight 107 pivotally mounted on rotational shaft 102. Rotation of the adjusting arm brings about a phase displacement between the two contra-rotating eccentric weights and thereby a change in the direction of the vibrational force.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • Paleontology (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • Architecture (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Road Paving Machines (AREA)
  • Braking Arrangements (AREA)

Abstract

Control for regulating the direction of the vibrational force in plate vibrators for compacting gravel, sand and similar materials and which are equipped with a vibrating element consisting of two or more contra-rotating eccentric weights. Particularly characteristic of the control is that it acts on the adjusting mechanism (4) of the vibrating element by means of a wire (4) and that its control (3) can be held in the set position by means of a spiral spring (7) interacting with a friction brake (11).

Description

CONTROL FOR PLATE VIBRATORS
The purpose of the present invention is to achieve a control for plate vibrators by means of which the direction of the vibrational force generated by the vibrating element of the plate vibrator can be steplessly varied and set in the desired position.
On plate vibrators designed for the compaction of soil, asphalt and similar materials and which are equipped with vibrating elements consisting of two or more contra-rotating eccentric weights, a known method of changing the direction of the vibrational force is by changing the phase position of the rotating eccentric weights in relation to each other for the purpose of causing the plate vibrator to move in a forward or reverse direction.
Plate vibrators of the type in question are used for compacting sand, gravel and similar materials and are often used as auxiliary units to supplement larger compaction machines on roadworks etc. By virtue of their ability to move forward and in reverse, su.ch plates are suitable for compaction work in pipe trenches and similar confined spaces where the scope for manoeuvring a plate which is capable of moving in only one direction is limited. It is important that reversal of the direction of movement of the plate can be achieved partly in a simple and practical manner as far as the operator is concerned and partly so that the desired speed control position for moving forward and in reverse respectively can be set and maintained without inconvenience to the operator. The purpose of the invention is to achieve a control for changing the direction of the vibrational force, whereby resetting the vibrating element by means of the control is achieved by means of a wire arranged between the control and the adjusting mechanism of the element.
The control in accordance with the invention is particularly suitable for vibrating elements of the type described in Swedish patent No. (Swedish patent application No.7609352-5 ), for example.
This type of vibrating element consists of at least two contra-rotating eccentric weights connected to each other via gears for the purpose of resetting the phase position of the eccentric weights in relation to each other while in operation, whereby one of the eccentric weights is arranged to pivot in relation to the rotational shaft of the vibrating element and driving of the adjustable eccentric is accomplished from the rotational shaft via a gear transmission which embraces an adjusting mechanism equipped with a pulley which is arranged to be rotated by means of a wire wound round the pulley for resetting the adjusting mechanism imparting a rotating movement to it. The vibrating element is so designed that while in operation it automatically adjusts itself so that the vibrational force generated by the element imparts to the plate vibrator a maximum translation speed in the forward direction.
The control consists of a hub around which the resetting wire is wound and secured. Fixed to the hub is a control lever by means of which the hub can be rotated. By moving the lever in one or the other direction the wire can be wound round the hub and unwound from it respectively. Pulling on the wire results in a rotation of the adjusting mechanism and consequently a change in the translation speed of the plate. If the lever is released the adjusting mechanism automatically returns to the position at which maximum translation movement in a forward direction is obtained.
The pulling force exerted by the element on the wire as long as it is in operation is comparatively large. However, this can be overcome without much difficulty by means of the control lever In order to cause the plate to move in reverse or in a forward direction at a slower speed than maximum the driver must, however, continuously hold the lever in the desired speed position which may be tiring at length. To counteract the pulling force of the element on the wire a spiral spring is mounted in accordance with the invention on the hub of the control so that it exerts a turning force on the hub acting in the opposite direction to the moment of the pulling force of the vibrating element on the wire. The spiral spring is thereby so tensioned that the force generated by the spring eliminates that caused by the element.
Owing to the continuous vibration to which control and spring are exposed, and also on account of differences between the properties of the springs, the control lever may under certain circumstances move out of its set speed position. A friction brake is therefore arranged on the hub, the purpose of which is to hold it in place on application and thereby the speed position set on the control . The combination of tensioned spring and brake with adjustable application in accordance with the invention permits arbitrary regulation of the control function.
If the spiral spring is tensioned to exert a force in the hub which does not entirely counteract the force caused by the vibrating element, the operator must continuously hold the control lever in the desired speed position so that it does not return to the position at which maximum forward speed is obtained. However, the force in the lever is not so great that it causes major inconvenience to the driver for shorter periods. On the other hand, the advantage gained is that if the operator when driving in reverse, for example, trips and is consequently forced to release the lever, the plate automatically goes into the forward direction mode. This may be particularly advantageous when compacting in pipe trenches and other confined spaces.
Under other compaction conditions it may be an advantage if the operator can release the control lever without the speed of the plate changing to maximum forward motion. Under these conditions the brake interacting with the control hub can be set to retain the lever in the desired speed position. Application of the brake is then selected so that the lever can be moved to the desired speed setting without the operator having to use much force but so that braking power is sufficiently high to keep the lever in the set position.
The invention will be described in greater detail in the following with reference to the appended drawings where Fig. 1 shows a version of the control viewed from the side, Fig. 2 a cross-section through the line
A-A in Fig. 1 and Fig. 3 a cross-section through the line B-B in Fig. 2. Fig. 4, finally, shows a suitable vibrating element on which the control according to the invention is practically applicable.
The control consists of a hub 1 which is arranged to pivot on a shaft 2 mounted on the control handle of the plate vibrator. The hub is caused to rotate about its axis by means of a control handle 3 fixed to the hub. Wound round the hub is a wire 4, one end of which is connected to and wound round (not shown) a pulley 5, Fig. 4, incorporated in the adjusting mechanism of the eccentric element. The other end of the wire is secured to hub 1 by means of a retaining screw 6. During operation the eccentric element exerts a constant pulling force on wire 4 and thereby gives rise to a turning force on hub 1. To counteract this the hub is fitted with a spiral spring 7, one end 8 of which is secured to a disc 9 which comprises an integral part of hub 1. The other end 10 of spring 7 is secured to the rotational shaft
2 of hub 1. The spring 7 is so tensioned that the turning force thus exerted on hub 1 partially eliminates the force caused by the eccentric element.
Owing to the vibration in the plate vibrator and also on account of differences in the characteristics of the springs, hub 1 is equipped with a friction brake. This consists of cup springs 11 which are mounted in pairs on shaft 2 at each end of hub 1. The cup springs are tensioned by means of a nut 12 screwed onto shaft 2, the nut being held in position by a locknut 13. By screwing in nut 12 the cup springs 11 are tensioned between it and the end of the hub and between the other end of the hub and a shoulder 14 on shaft 2. The desired application of the friction brake is obtained in this manner.
Shaft 2 is secured to a bracket 15 on the control handle of the plate vibrator by means of a screw connection 16. It is so mounted that when screw 16 is slackened, shaft 2 can be rotated in relation to hub 1, whereby spring 7 can be tensioned by the desired amount. The control is built into a casing 7 secured to the control handle of the plate vibrator. Arranged inside it is a stop 18 for two studs 19 and 20 arranged on hub disc 9. In the reverse direction position of the control stud 19 rests against stop 18 and in the forward direction position stud 20 rests against it.
The outer end of wire 4 is secured to and wound round pulley 5 of the eccentric element. By moving control lever 3 from the position at which hub stud 19 rests against stop 18 until stud 20 is brought to rest against this stop the setting of the eccentric element shown in Fig. 4 is changed from generating a vibrational force which imparts to the plate vibrator a translation movement in the reverse direction to a translation movement in the forward direction.
The eccentric element shown in Fig. 4 consists of a housing 101 in which rotatable shaft 102 is journalled and on which shaft an eccentricwaight 102 is secured. The shaft is journalled in bearings 104 and 105 and is caused to rotate by means of pulley 106 which is shaped as an eccentric weight and secured to one end of the shaft. On shaft 102 an eccentric weight 107 is journalled so as to rotate in bearing 108 and by means of a gear transmission interacting with shaft 102 the weight is caused to rotate in the opposite direction to and with the same rotational speed as eccentric weights 103 and 106.
The gear transmission consists of a gear 109. rigidly secured to shaft 102, this gear meshing with a gear 110 via a gear that is not shown. Another gear 111 is rigidly secured to the same shaft as gear 110 and this gear meshes with gear 112 which is rigidly secured to eccentric weight 107.
By pulling on wire 4 the pulley 5 is caused to rotate and with it a gear segment 113 mounted on the shaft of the pulley, the gear segment interacting via a gear flange 114 and an adjusting arm 115 with the gear transmission for the eccentric weight 107 pivotally mounted on rotational shaft 102. Rotation of the adjusting arm brings about a phase displacement between the two contra-rotating eccentric weights and thereby a change in the direction of the vibrational force.

Claims

1 A control for regulating the direction of the vibrational force in plate vibrators for compacting gravel, sand and similar materials, such plates being equipped with the type of vibrating element that consists of two or more contra-rotating eccentric weights and an adjusting mechanism interacting with them via gears, the adjusting mechanism being arranged to be given an adjusting movement, which affects the direction of the vibrationa1 force, by means of a wire connected to the mechanism, characterized in that one end of the wire (4) is secured to and partially wound round a pulley (5) connected to the adjusting mechanism of the vibrating element and the other end of the wire is secured to and partially wound round a hub (1) forming part of the control the hub being pivotally journalled on a shaft (2) which is rigidly secured to the control handle of the plate vibrator.
2 A control as in Claim 1, characterized in that a spiral spring (7); one end of which is secured to the hub (1) and the other end to the shaft (2), is tensioned so as to exert a turning force on the hub (1).
3 A control as in Claim 1, characterized by a friction brake consisting of cup springs (11) which are mounted on the shaft (2) and tensioned against the hub (1) by means of a nut (12) threaded on the shaft (2).
4 A control as in any of the foregoing claims, characterized by a lever (3) mounted on the hub (1).
PCT/SE1981/000020 1980-03-06 1981-01-27 Control for plate vibrators WO1981002593A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3137614T DE3137614C2 (en) 1980-03-06 1981-01-27 Control device for plate vibrators
BR8108737A BR8108737A (en) 1980-03-06 1981-01-27 CONTROL FOR PLATE VIBRATORS

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8001763A SE420112B (en) 1980-03-06 1980-03-06 VIBRATOR PLATOR MANOVERDON
SE8001763 1980-03-06

Publications (1)

Publication Number Publication Date
WO1981002593A1 true WO1981002593A1 (en) 1981-09-17

Family

ID=20340433

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1981/000020 WO1981002593A1 (en) 1980-03-06 1981-01-27 Control for plate vibrators

Country Status (10)

Country Link
JP (1) JPS57500251A (en)
BR (1) BR8108737A (en)
CA (1) CA1166123A (en)
DE (1) DE3137614C2 (en)
FR (1) FR2477598A1 (en)
GB (1) GB2093571B (en)
MX (1) MX153044A (en)
NL (1) NL8101104A (en)
SE (1) SE420112B (en)
WO (1) WO1981002593A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2315796A (en) * 1996-08-01 1998-02-11 Theodore Stig Wadensten Reversable plate compactor having directional control
CN111485721A (en) * 2020-04-27 2020-08-04 陈建军 Concrete vibrator appurtenance
CN114763691A (en) * 2021-01-14 2022-07-19 约瑟夫福格勒公司 Adjustment of the tamping stroke

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1100482A (en) * 1912-10-28 1914-06-16 Nicolas Herzmark Power-transmitting device.
US1551823A (en) * 1925-03-09 1925-09-01 Amac Ltd Control lever
US3448633A (en) * 1966-12-30 1969-06-10 Monarch Road Machinery Co Flexible control mechanism for valves and the like
US3814533A (en) * 1972-11-03 1974-06-04 H Buck Compactor for soil and the like with improved vibrator assembly
US3817646A (en) * 1973-04-30 1974-06-18 Wacker Corp Vibration generator
US3915029A (en) * 1974-09-09 1975-10-28 Shimano Industrial Co Operating lever for gear-shifting means of a bicycle
SE410800B (en) * 1976-08-24 1979-11-05 Dynapac Maskin Ab VIBRATION PLATE FOR PACKING OF SOIL, ASPHALT AND SIMILAR MATERIALS

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1100482A (en) * 1912-10-28 1914-06-16 Nicolas Herzmark Power-transmitting device.
US1551823A (en) * 1925-03-09 1925-09-01 Amac Ltd Control lever
US3448633A (en) * 1966-12-30 1969-06-10 Monarch Road Machinery Co Flexible control mechanism for valves and the like
US3814533A (en) * 1972-11-03 1974-06-04 H Buck Compactor for soil and the like with improved vibrator assembly
US3817646A (en) * 1973-04-30 1974-06-18 Wacker Corp Vibration generator
US3915029A (en) * 1974-09-09 1975-10-28 Shimano Industrial Co Operating lever for gear-shifting means of a bicycle
SE410800B (en) * 1976-08-24 1979-11-05 Dynapac Maskin Ab VIBRATION PLATE FOR PACKING OF SOIL, ASPHALT AND SIMILAR MATERIALS

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2315796A (en) * 1996-08-01 1998-02-11 Theodore Stig Wadensten Reversable plate compactor having directional control
GB2315796B (en) * 1996-08-01 1998-10-14 Theodore Stig Wadensten Reversible plate compactor having an improved drive and directional control
CN111485721A (en) * 2020-04-27 2020-08-04 陈建军 Concrete vibrator appurtenance
CN114763691A (en) * 2021-01-14 2022-07-19 约瑟夫福格勒公司 Adjustment of the tamping stroke
US12077920B2 (en) 2021-01-14 2024-09-03 Joseph Voegele Ag Tamper stroke adjustment

Also Published As

Publication number Publication date
DE3137614C2 (en) 1986-02-06
GB2093571B (en) 1983-04-20
NL8101104A (en) 1981-10-01
GB2093571A (en) 1982-09-02
CA1166123A (en) 1984-04-24
SE420112B (en) 1981-09-14
JPS57500251A (en) 1982-02-12
BR8108737A (en) 1982-06-22
FR2477598A1 (en) 1981-09-11
MX153044A (en) 1986-07-10
DE3137614T1 (en) 1982-09-09
FR2477598B1 (en) 1985-03-29
SE8001763L (en) 1981-09-07

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