DE3822008A1 - Extendable telephone pivot arm - Google Patents

Abstract

In known telephone pivot arms, the horizontal adjustment of the telephone carrier plate is achieved by means of scissor arms or telescopic arms (design-related small adjustment path), but also by single or double parallelogram guide pairs, the telephone carrier plate undergoing an additional height adjustment (adjustment path limited by a weight-counterbalancing spring). The new pivot arm is intended to allow an extensive adjustment path while maintaining a constant height. By holding a parallelogram guide pair which is articulated so that it can be pivoted on the desktop and a similar guide pair articulated on the telephone carrier plate by means of a segmental cogwheel in a position symmetrical in relation to one another and to the mechanism housing which connects them, the telephone carrier plate can be adjusted horizontally over an extensive area. The telephone carrier plate has a high carrying capacity due to the forced horizontal movement (without a weight-counterbalancing spring).

Description

The invention relates to an extendable telephone swivel arm, whose phone support plate by means of a fork on two parallel links is attached, which at its other end to a mechanism housing are articulated, on which in turn two parallel links are articulated, which at its other end can be rotated on the table stand attached fork piece are articulated.

Extendable and swiveling telephone arms are known, in which the arm can be pivoted about an axis in the table stand, the Extend the phone carrier plate away from the stand or push it in towards the stand by different mechanisms.

Known is the scissor arm, which has the disadvantage that it stands out difficult to push together when fully extended, because the many scissor joints cause a lot of friction and the scissors angles appear unfavorable.

Another known version is the telescopic arm, in which a Linkage is moved into each other. As with the scissor arm, the Movement path when extending and retracting in relation to the extended Length relatively small.

A likewise known embodiment has the same parallel link Mechanism known from desk lamps, and is held in height like this by the spring balancer, whereby the results in low load capacity. In addition, when pulling out or pushing in the height of the telephone carrier plate.

The object of the invention is to overcome the disadvantages described above small adjustment range and the change in height when pulling out or To eliminate insertion.

This object is achieved in that by the tooth  intervention of those in the mechanism housing on the two outer ones Parallel links attached gear segments to the stator-side parallel Handlebars and the parallel handlebars on the phone in a symmetrical angular position be held to the mechanism housing, whereby the phone support plate one experiences positively controlled horizontal path.

The inevitably horizontal path for the telephone support plate results from the fact that the outer links ( 3 and 6 ) to the mechanism housing ( 5 ) always have the same, symmetrical angular position due to the engagement of the gear segments ( 10 ). This ensures that the phone support plate can be moved in the entire area, directly from the stand to the outer end position. Another solution according to the invention of the above-described object is characterized in that the stator-side parallel link and the telephone-side parallel link are connected by an intermediate link which, on an extension contained in the mechanism housing, is one of the parallel connected to the fork piece rotatably attached to the table stand -The handlebars and an angular extension of one of the parallel links connected to the fork piece attached to the parallel handlebar attack, are held in an approximately symmetrical angular position to the mechanism housing, whereby the phone support plate experiences a positively controlled, almost horizontal path. This results in a positively controlled, horizontal, but slightly curved path of the telephone carrier plate. This disadvantage is offset by the advantage of a simpler design without toothed segments. The invention is explained below with reference to the embodiment examples shown in the drawings.

Fig. 1 shows the extendable telephone swivel arm according to the invention in side view schematically in the middle position in a sectional view.

Fig. 2 shows a variant of the extendable telephone swivel arm, in which a lever mechanism with approximately symmetrical handlebar movement is used instead of the gear engagement for the exactly symmetrical handlebar movement.

Fig. 3 shows the subject of the invention in side view in a pushed together position.

Fig. 4 shows the subject of the invention in side view in the extended position.

The telephone support plate ( 9 ) of the extendable telephone swivel arm is attached by means of a fork piece ( 8 ) to two parallel links ( 6 and 7 ), which are articulated at their other end to a mechanism housing ( 5 ), which in turn two parallel link are hinged (3 and 4) which are articulated at their other end to a table on the stand (1) rotatably plugged fork piece (2).

In the embodiment of Fig. 1 are obtained by the meshing engagement of the gear segments (10) located musgehäuse in Mechanical- (5), the stator-side parallel link (3 and 4) and the phone side parallel link (6 and 7) in a symmetrical angular position relative to mechanism- Housing held. As a result, the positively controlled, horizontal path of the telephone carrier plate is achieved, and the height of the telephone carrier plate is kept constant without tension springs or grid positions.

In the embodiment of Fig. 2, the stator-side parallel link (3 and 4) and the phone side parallel link (6 and 7) through an intermediate link (11) formed on a in the mechanism housing extension contained (5) of the are with the on the table stand ( 1 ) rotatably plugged th fork piece connected parallel link ( 3 and 4 ) and at an angle extension one of the on the phone support plate ( 9 ) attached fork piece ( 8 ) ver connected parallel link ( 6 and 7 ) attacks , held in an approximately symmetrical angular position to the mechanism housing.

As a result, a positively controlled, horizontal, in contrast to the embodiment of FIG. 1 but slightly arcuate path of the telephone support plate, he acts. This disadvantage compared to the embodiment according to FIG. 1 is offset by the advantage of the simpler embodiment without gear segments.

Claims (2)

1. Extendable telephone swivel arm, the telephone support plate is attached by means of a fork to two parallel links, which are hinged at their other end to a mechanism housing, on which in turn two parallel links are hinged, which at their other end are articulated to a fork piece rotatably attached to the table stand, characterized in that the toothed gear segments ( 10 ) located in the mechanism housing ( 5 ) and attached to the two outer parallel links ( 3 and 6 ) cause the stand-side parallel links ( 3 and 4 ) and the phone-side parallel link ( 6 and 7 ) are held in a symmetrical angular position to the mechanism housing, whereby the telephone support plate ( 9 ) experiences a positively controlled horizontal path. 2. Extendable telephone swivel arm, the telephone support plate is attached by means of a fork to two parallel links, which are hinged at their other end to a mechanism housing, on which in turn two parallel links are hinged, which at their other end a fork piece which is rotatably attached to the table stand, characterized in that the parallel link arms ( 3 and 4 ) on the stand side and the parallel link arms ( 6 and 7 ) on the telephone side are connected by an intermediate link ( 11 ) which is attached to a in the mechanism housing ( 5 ) included extension of one of the parallel links ( 3 and 4 ) connected to the fork piece rotatably attached to the table stand ( 1 ) and to an angular extension of one of the fork links ( 8 ) attached to the telephone support plate ( 9 ) connected parallel links ( 6 and 7 ) attacks, are held in an approximately symmetrical angular position with respect to the mechanism housing, as a result of which the telephone carrier plate ( 9 ) has a positively controlled, experiences approximately horizontal path.