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Patent 1166123 Summary

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Claims and Abstract availability

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(12) Patent: (11) CA 1166123
(21) Application Number: 1166123
(54) English Title: CONTROL FOR PLATE VIBRATORS
(54) French Title: COMMANDE POUR COMPACTEUR VIBRATOIRE A PLAQUES
Status: Term Expired - Post Grant
Bibliographic Data
(51) International Patent Classification (IPC):
  • G05G 7/00 (2006.01)
  • E01C 19/38 (2006.01)
  • E02D 3/074 (2006.01)
(72) Inventors :
  • GRANE, GUNNAR (Sweden)
(73) Owners :
  • DYNAPAC MASKIN AKTIEBOLAG
(71) Applicants :
  • DYNAPAC MASKIN AKTIEBOLAG
(74) Agent: SMART & BIGGAR LP
(74) Associate agent:
(45) Issued: 1984-04-24
(22) Filed Date: 1981-02-27
Availability of licence: N/A
Dedicated to the Public: N/A
(25) Language of filing: English

Patent Cooperation Treaty (PCT): No

(30) Application Priority Data:
Application No. Country/Territory Date
8001763-5 (Sweden) 1980-03-06

Abstracts

English Abstract


ABSTRACT
The present invention refers to a 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 of the vibrating element by means
of a wire and that its control can be held in the set posi-
tion by means of a spiral spring interacting with a friction
brake.


Claims

Note: Claims are shown in the official language in which they were submitted.


THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
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
vibrational force by means of a wire connected to the
mechanism, one end of the wire being secured to and
partially wound round a pulley connected to the adjusting
mechanism of the vibrating element and the other end of
the wire being secured to and partially wound round a hub,
characterized in that the hub is pivotally journalled
on a shaft and rigidly connected with a control handle of
the plate vibrator, and that a spiral spring, one end of
which is secured to the hub and the other end of the
shaft, is tensioned so as to exert a turning force on
the hub in order to eliminate the moment on the hub
generated by the vibrating element during rotation, and
that a friction brake consisting of cup springs are
mounted on the shaft and tensioned against the hub by
means of a nut threaded on the shaft.

Description

Note: Descriptions are shown in the official language in which they were submitted.


-~N~ C ~ KIN i~ T~l~
~rhe pu~-pose of ~he prescnt invention is -to ~chieve a
c(>n~:~ol for p]a1e v;bralors by mc~ans of which t:he direction
of t:he vil-rational folce (3enerated by the vibrating element
of the plate vibrator can be steplessly varied and set in
the desired position.
-~- On plate vibrators desic~ned for t:he compaction of soil,
asphalt and similar materia]s and wh;ch are equipped with
vibrating e]ements consisting of two or more contra-rotating
eecentrie weights, a known method of changing the direction
of the vibrational foree is by ehanging the phase position of
the rotating eccentrie weights in relation to eaeh 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 ete. By virtue of their ability to move forward
and in reverse, sueh ~lates are suitable for eompaction work
-~ in pipe trenches and similar confined spaees where the scope
for manoeuvring a plate whieh is capable of moving in only
one direction is limited. It is important that reversal of
8 the direetion of movement of the plate ean be aehieved partly
in a simple and practical manner as far as the operator is
coneerned and partly so that the desired speed eontrol position
for moving forward and in reverse respeetively ean be set and
L~aintained without ineonvenienee to the operator. The purpose
. ~
~,

11~ 23
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. 410,800, 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.

!~,,. 3
lZ3
~ulling on the wire rcsults ;n a rotation of the adjusting
mecllanism and cons~ucntly a ch.ln~e in the Lranslalion s~ d
of the p]~';,e. If the lever is released the acljusting
mechanism automatically returns to the posltion at which
maximum translation movement in a forward direction is
obtained.
The pulling force exerted by the element on the wire às
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 causè 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 circumstanccs 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.
.

~ 4
lZ3
The combination of tellsioned spring and brake with adjustable
al~plication in accordallce with the invention permits arbitrary
re~ulation of -the control function.
If t:he spiral spring is tensioned to exert a force in the
hub which does not entirely c:ounteract the force caused
by the vibrating clement, the operator must continuously
hold the control lever in the dcsired speed position so
that it cloes 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 particu]arly 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
La 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,
~S~~

123
~hows a sui1:able vibrat;n~ elemellt on which the control
accordin~ to the ;nvell~ion is PraCtically applic~}~le.
The control consists of a hub 1 whicll is arranged to pivot on
a shaft 2 mounted on the control hand]e of the plate vibrator.
The hub is caused to rota~e about its axis by mcans of a
control halldle 3 fixed to the hub. Wound round the hub is a
wire 4, one end of which is connected to and wound round tnot
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 orce on wire 4 and thereby gives rise to a turning
force on hub 1. To counteract ~his 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 ec¢entric element.
Owing to the vibration in the plate vibrator and also on
account of differences in the characteristics of the sprin~s,
- 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 tensionedby means
8 of a nut 12 screwed onto shaft 2, the nut bein~ 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
Lshaft 2. The desired application of the friction brake is
obtained in this manner.
_ S

123
~haft 2 is secured to a bracket 15 on the con~rol handle
of the plate vibrator by means of a screw connection 16.
It is so mounted that when scrcw 16 is slackened, shaft 2
can be rotated in relation to hub 1, whereby spring 7 can be
tensioned ~y the desired amount.-TI1e control is built into
-~ a casing ~ 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. ~y moving control lever
3 from the position at which hub stud 19 res~s against
stop 18 until stud 20 is broughtto rest against this stop
the setting of the eccéntric 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
shaf~t an eccentric weight ~ is secured. The shaft is
journalled in bea~ings 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
8 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.

Representative Drawing

Sorry, the representative drawing for patent document number 1166123 was not found.

Administrative Status

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Event History

Description Date
Inactive: IPC from MCD 2006-03-11
Inactive: IPC from MCD 2006-03-11
Inactive: Expired (old Act Patent) latest possible expiry date 2001-04-24
Grant by Issuance 1984-04-24

Abandonment History

There is no abandonment history.

Owners on Record

Note: Records showing the ownership history in alphabetical order.

Current Owners on Record
DYNAPAC MASKIN AKTIEBOLAG
Past Owners on Record
GUNNAR GRANE
Past Owners that do not appear in the "Owners on Record" listing will appear in other documentation within the application.
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Document
Description 
Date
(yyyy-mm-dd) 
Number of pages   Size of Image (KB) 
Cover Page 1993-12-02 1 12
Abstract 1993-12-02 1 12
Claims 1993-12-02 1 33
Drawings 1993-12-02 2 39
Descriptions 1993-12-02 6 223