Hold-open device for a door

Abstract: A hold-open device for a turnable door or the like suitably provided with a door closer, the device including guide track means (3), an operating arm (1) provided with a sliding unit (2) movably mounted within the guide track means (3) and a retainer unit (4) including a body part (4a) supported on the guide track means (3) and a holder piece (4b) turnable against the force of a spring member (7) and arranged in cooperation with the sliding unit (2) for keeping it in a position corresponding to the desired hold-open position of the door. The holder piece (4b) is turnably journalled to the body part (4a) and the retainer unit (4) is provided with an adjustment member (8) which is adjustable to vary the prestress of the spring member (7) and to limit the turning position of the holder piece (4b) relative to the body part (4a).

Description: This invention relates to a mechanically operated hold-open device for holding a turnable door in an open position, the device being of the kind according to the preamble of claim 1. In this specification the term "turnable door" is intended to cover any door, gate, window or the like which is turnable between open and closed positions. In a modern known device for holding open a door, it should be possible to adjust both the force required to hold the door open and the angle that the door is held open. In addition, when necessary, it should be possible for the. door to be opened beyond the selected hold-open angle, preferably by exerting only a further opening force, on the assumption that the selected angle has not already exceeded about 180°. Furthermore, when desired, it should be possible to disconnect completely the hold-open device from operation. A known hold-open device of the kind referred to is shown in DE-A-3604083. Although the aims referred to above can be met with this known device, its construction and means for effecting adjustments are rather complicated. For instance, the adjustment of the hold-open force and the disconnection of the hold-open device from operation are carried out by separate means. An aim of the present invention is to provide an improved mechanically operated hold-open device of the kind referred to which is constructionally simple and easy both to install and to adjust. According to the present invention there is provided a door hold-open device as claimed in the ensuing claim 1. Only a small number of parts is required for such a hold-open device. In addition a stepless adjustment of the hold-open force for the door can be provided simply with only one adjustment member which also allows the hold-open device to be totally disconnected from operation when desired. Advantageously the spring member is located at the second end of the holder piece so that it urges the holder piece against the sliding unit when the latter moves over the retainer unit. The adjustment member can be located between the first end of the holder piece and the spring member. Alternatively, the adjustment member could be located on the other side of the spring member by slightly redesigning the end of the holder piece. The adjustment member preferably comprises a screw extending through the holder piece and supported by threads to the body part. The retainer unit is suitably adjustably positionable relative to the guide track means so that the adjustment of the hold-open angle of the door can be accomplished simply by moving the retainer unit relative to the guiding track. In practice the guide track means is advantageously casing-like and comprises guiding surfaces for urging the sliding unit by means of the spring member between the holder piece and the guide track means. An embodiment of the invention will now be described, by way of example only, with particular reference to the accompanying drawings, in which: Figure 1 is a longitudinal sectional view of a hold-open device according to the invention in which the hold-open device is not yet in operation; Figure 2 is a section taken on the line II-II of Figure 1; Figure 3 is a section taken on the line III-III of Figure 1; Figure 4 is a longitudinal sectional view of the hold-open device of Figure 1 shown just before it is in its hold-open position; Figure 5 is a section taken on the lines V-V of Figure 4; and Figure 6 is a longitudinal sectional view of the hold-open device of Figure 1 when in a position in which the device holds the door open at a selected hold-open angle. In the drawings there is shown an operating arm 1 of a mechanically operated hold-open device according to the invention for holding a turnable door in an open position, the arm being connectable to a door closer (not shown) controlling the movements of a turnable door or the like. The arm 1 is turnably journalled to a sliding unit 2 of the hold-open device which moves back and forth, in accordance with the turning movements of the door, in a casing-like guiding track 3 guided by guiding surfaces 2a and 3a. The guiding track 3 is provided with a retainer unit 4 comprising a body part 4a and a holder piece 4b turnably journalled to the body part 4a by a shaft 5. The body part 4a is adjustably fixed to the guiding track 3 at a certain desired position by screws 6 so that the hold-open device keeps the door at a desired hold-open angle. When the screws 6 are tightened, guiding parts 4e included in the body part 4a of the retainer unit are tightly pressed against guiding surfaces 3b in the guiding track 3 holding the retainer unit 4 at is desired position. The hold-open angle of the door can be adjusted by loosening the screws 6, changing the position of the retainer unit 4 in the guiding track 3 and retightening the screws. The operation of the hold-open device is based on the cooperation between the retainer unit 4 and the sliding unit 2, the sliding unit 2 moving along the guiding track 3 and over and beyond the retainer unit 4 when the door is opened. To allow this to occur, the retainer unit 4 is provided with a spring 7 and an adjustment screw 8 for adjusting the prestress of the spring 7. The adjustment screw 8 also limits the turning position or the turning angle of the holder piece 4b of the retainer unit 4 relative to the body part 4a of the retainer unit. Adjustment of the screw 8 affects the hold-open force of the device, which can be adjusted according to the size and weight of the door in each case and the strength or power of intended door users. If desired the hold-open device can also be operationally disconnected simply by tightening the adjustment screw 8 so that the sliding unit 2 can slide un-obstructed over and beyond the holder piece 4b in the guiding track 3. Figure 4 shows the hold-open device in a position where the sliding unit 2 has been moved to a position over the retainer unit 4 with a flat surface 2b of the unit 2 cooperating with a flat surface 4c of the unit 4. On continued opening of the door, the sliding unit 2 slides beyond the retainer unit 4. As the sliding unit 2 passes over the retainer unit 4, the spring 7 urges the sliding unit 2, via the holder piece 4b, upwardly (as viewed in Figure 4) so that surfaces 2c of the sliding unit 2 and surfaces 3c of the guiding track 3 are urged into contact with each other. Thus, depending on the coefficient of friction between, on the one hand, the surfaces 2b and 4c and, on the other hand, the surfaces 2c and 3c, the spring force of the spring 7 and the turning angle of the holder piece 4b, the sliding unit 2 is smoothly guided beyond the retainer unit 4 into the position shown in Figure 6, in which the hold-open device keeps the door in the selected hold-open position determined by the position of the retainer unit 4. From this position the door can be freely turned further into its fully open position. By exerting sufficient power, the sliding unit 2 can be moved back (towards the left in the Figures) over the retainer unit 4 in order to close the door. As already noted above, the hold-open force can be adjusted by means of the adjustment screw 8. To provide a smoother movement of the sliding unit 2 beyond the holder piece 4b, the edges of the sliding unit 2 have bevelled parts 2d and the edge of the holder piece 4b includes a curved or rounded corner portion 4d. In this case, the door closing is influenced not only by the turning position of the holder piece 4b adjusted by the adjustment screw 8, but also by the coefficient of friction between the surfaces 2c and 3c and the surfaces 2d and 4d. If the operating arm 1 is connected to, or forms part of, a door closer (not shown) there will be a closing force acting on the arm 1 and directed to the left (as viewed in Figure 6) when the hold-open device is in the position shown in Figure 6. Thus the bevelled parts 2d are resiliently urged against the portion 4d so that the door is held in its open position. Alternatively, however, spring means (not shown) could be associated with the guide track 3 to urge the bevelled parts 2d against the portion 4d when the device is in its hold-open position. For example an elastically extensible member could extend from the left (as viewed in Figure 6) end of the sliding unit 2 to the left end of the track 3, around a guide member (not shown) at the left end of the track, along the track 3, around a guide member (not shown) at the right end of the track 3 and connected to the right hand end of the body part 4a. Such an arrangement would allow the position of the body part 4a along the track to be adjusted without influencing the force exerted by the extensible member on the sliding unit 2. In this case the parts 2d could be held resiliently against the portion 4d without the operating arm being connected to a door closer. The invention is not limited to the embodiment shown and several modifications thereof are feasible, its scope being defined in the following claims.

Claims: A mechanically operated hold-open device for holding a turnable door in an open position including guide track means (3), an operating arm (1) provided at one of its ends with a sliding unit (2) movably mounted within the guide track means (3) for movement therealong, in use of the device, on turning of the door, and a retainer unit (4) mounted in the guide track means (3) and including a body part (4a) supported on the guide track means (3), a holder piece (4b) turnably journalled to the body part (4a) for turning relative to the body part (4a) between a first position which does not obstruct movement of the sliding unit along the guide track means and a second position which does obstruct the movement of the sliding unit along the guide track means, the holder piece having opposite first and second ends and a sliding surface at said second end of the holder piece, a spring member (7) urging the holder piece to turn towards its second position, and an adjustment member (8) for adjusting prestress of the spring member (7) and the said second position of the holder piece (4b), the sliding unit (2), on opening of the door, moving along the guide track means (3) over the holder piece (4b) from said first end to said second end of the latter and cooperating with the sliding surface of the holder piece so that initially the sliding unit contacts the sliding surface when the holder piece (4b) is in its second position and causes the latter to turn out of its second position towards its first position in opposition to the spring force provided by said spring member and subsequently, as a trailing edge of the sliding unit moves over a front edge of the sliding surface, the spring member (7) urges the holder piece to move back into its second position to keep the sliding unit in a position corresponding to the desired hold-open position of the door, characterised in that the holder piece (4b) is turnably journalled to said body part (4a) at said first end, and in that the sliding surface is at least substantially planar with its front edge comprising a curved or rounded corner portion (4d). A hold-open device according to claim 1, characterised in that said spring member (7) is located at said second end of the holder piece (4b) so that it urges the holder piece (4b) against the sliding unit (2) when the latter moves over the retainer unit. A hold-open device according to claim 1 or 2, characterised in that the adjustment member (8) is located between the first end of the holder piece (4b) and the spring member (7). A hold-open device according to any one of the preceding claims, characterised in that the adjustment member (8) comprises a screw (8) extending through the holder piece (4b) and supported by threads to the said body part (4a). A hold-open device according to any one the preceding claims, characterised in that the retainer unit (4) is adjustably positionable relative to the guide track means (3) for adjusting the hold-open angle of the door. A hold-open device according to any one of the preceding claims, characterised in that the guide track means (3) is casing-like and comprises guiding surfaces (3c) for urging the sliding unit (2) by means of the spring member (7) between the holder piece (4b) and the guide track means (3). A door fitted with a hold-open device according to any one of the preceding claims. A door according to claim 7 and also fitted with a door closing device, characterised in that said operating arm (1) has an end opposite to its said one end connected to the door closing device.

Inventors: JUNTTILA JAAKKO, JUNTTILA, JAAKKO
Applicants: ABLOY OY
Application year: 1997
Main classification: E05C17
IPC codes: E05C17