EP2937499A1

EP2937499A1 - Pivot for a door

Info

Publication number: EP2937499A1
Application number: EP14001442.4A
Authority: EP
Inventors: Meng Sang Kwan; Suresh Krishnan Shyam
Original assignee: Dorma Deutschland GmbH
Current assignee: Dorma Deutschland GmbH
Priority date: 2014-04-22
Filing date: 2014-04-22
Publication date: 2015-10-28
Also published as: CN105019751A

Abstract

The invention relates to a pivot (1) for a door, especially top pivot, comprising a pivot pin (2) having a center axis (3) and being slidable along the center axis (3), wherein the pivot pin (2) is engageable with the door, an adjusting element (4) comprising a first threat (8), and a connecting element (5) having a second threat (7) being engaged with the first threat (8) such that the connecting element (5) is displaceable by a rotation of the adjusting element (4) with respect to the connecting element (5), wherein the connecting element (5) is connected with the pivot pin (2) for coupling a displacement of the pivot pin (2) and the connecting element (5).

Description

Description of the invention

The invention relates to a pivot for a door, in particular a top pivot for a door, and a door closer system including the pivot.
In the state of the art, top pivots are known to be combined with floor-concealed door closers. Floor concealed door closers are provided in a recess of the floor with a top surface being on the same level as the floor. A spindle is the only part protruding from the top surface, wherein the spindle is provided to be connected to a bottom part of a door. As soon as the door is released after opening, the spindle pulls the door back to the closed state.
Further, the door has to be mounted to a top portion of the door frame. For this reason, a pivot, in particular a top pivot, is provided. A conventional top pivot is shown in figure 1. Figure 1 discloses a top pivot 100 having the design of a conventional first class lever mechanism. For example, the effort is applied via a screw 500 along a first direction 600. The effort is applied to a rocker 300 on a first side of the fulcrum 400 such that the rocker 300 pushes a pivot pin 200, which is provided on a second side of the fulcrum 400, along the second direction 700. The second direction 700 is opposite to the first direction 600. Hence, the length of the rocker 300 determines the mechanical advantage of the system being load arm or effort arm. The screw 500 is fastened up or down which in turn moves the pin accordingly.
However, the top pivot 100 according to the prior art requires a lot of space. In particular, a length dimension of the known top pivot is rather large due to the dimensions of the rocker arm.
Therefore, the object of the present invention is to provide a pivot of the species indicated in the generic part of patent claim 1, which can be manufactured at a low cost and which has a small overall size.
This problem is solved by the features of the inventive pivot. The inventive pivot for a door is especially a top pivot and comprises a pivot pin, an adjusting element and a connecting element. The pivot pin has a center axis and is slidable along the center axis. Further, the pivot pin is engageable with the door. In case the pivot pin is engaged with the door, the pivot pin provides a pivot point of the door. The adjusting element comprises a first threat, while the connecting element comprises a second threat, wherein the second threat is engaged with the first threat. Therefore, a displacement of the connecting element in relation to the adjusting element can be created by rotating the adjusting element with respect to the connecting element. In other words, the first threat and the second threat allow the adjusting element to screw into the connecting element. Additionally, the connecting element is connected with the pivot pin for coupling a displacement of the pivot pin and the connecting element. Preferably, the connecting element comprises an arm portion, which is connected to the pivot pin.
The dependent claims contain advantageous embodiments of the present invention.
In a preferred embodiment, the pivot comprises a base element for supporting the pivot pin and the adjusting element. The base element has at least a first surface. Particularly, the base element comprises a base plate which is covered by a cover plate. The surface of the cover plate not facing the base plate is regarded the first surface of the base element. In a particularly preferred embodiment, the center axis of the pivot pin is perpendicular to the first surface.
In a further particularly preferred embodiment, the pivot pin is slidable between a locking position and a retreat position. In the locking position the pivot pin protrudes more from the first surface of the base element than in the retreat position. In particular, the pivot pin does not protrude in the retreat position from the first surface. In the locking position, the pivot pin is engageable with the door.
In a yet further particularly preferred embodiment, the connecting member abuts against a first stopping member when the pivot pin is in the retreat position. The first stopping member is preferably attached to the adjusting element. Additionally, it is preferred that the connecting member abuts against a second stopping member when the pivot pin is in the locking position. In particular, the second stopping member is also attached to the adjusting element or is provided on the base element.
The adjusting element is preferably accessible for rotating from the first surface of the base element. The first surface is particularly the only surface which is accessible when the pivot is mounted in a door frame. Since the pivot is preferably a top pivot, the first surface is preferably a bottom surface of the pivot.
In a preferred embodiment, the base element comprises a hollow protrusion in which the pivot pin is supported. In particular, the hollow protrusion is a cylindrical hollow protrusion. The hollow protrusion preferably comprises a slit, in which the connecting element, especially the arm portion of the connecting element, can be moved without interfering with the base element. The hollow protrusion allows only a movement of the pivot pin along the center axis.
Further, the adjusting element is preferably provided in parallel to the center axis of the pivot pin. Therefore, a rotation of the adjusting element with respect to the connecting element leads to a displacement of the connecting element in parallel to the center axis. Accordingly, the direction of displacement of the connecting element is parallel to the only possible displacement directions of the pivot pin. Hence, the coupling of the movement of the pivot pin and the connecting element can be reached rather simple.
In a preferred embodiment, the pivot pin comprises a hole. Further, an end portion of the connecting element is provided within the hole. The connecting element preferably has an arm portion, while an end portion of the arm portion is provided within the hole. Particularly, the hole is a through hole.
Preferably, the adjusting element is an adjusting screw. In particular, it is preferred to fix the adjusting screw to the base element such that only rotation of the adjusting screw is allowed. If the adjusting screw is rotated with respect to the base element, the connecting element is displaced in relation to the base element. Together with the connecting element, the pivot pin is also displaced.
The invention also relates to a door closer system. The door closer system comprises a floor-concealed door closer and a pivot as described above. The inventive door closer system therefore is advantageous with respect to available space, in which the door closer system shall be installed.
In the following, the invention is explained in more detail on the basis of the accompanying drawing, in which:

Fig. 1: is a pivot for a door according to the prior art,
Fig. 2: is a first view of an inventive pivot according to a preferred embodiment,
Fig. 3: is a second view of the inventive pivot according to a preferred embodiment,
Fig. 4: is a third view of the inventive pivot according to a preferred embodiment, and
Fig. 5: is a fourth view of the inventive pivot according to a preferred embodiment.

Fig. 2 is an exploded view of the inventive pivot 1 according to a preferred embodiment. Figure 3 is a sectional view of the pivot 1 shown in figure 1. The pivot 1 comprises a base element 9 having a base plate 10 and a cover plate 11. The cover plate 11 covers the base plate 10. The base element 9 comprises a first surface 13 which is the surface of the cover plate 11 not facing the base plate 10. The base element may 9 be attached to a door frame, in particular to a top portion of the door frame, such that the first surface 13 is a bottom surface.
The first surface 13 comprises two holes, one for a pivot pin 2 and another for an adjusting element 4. The adjusting element 4 is therefore accessible for rotating from the first surface 13, wherein a rotation of the adjusting element 4 causes a displacement of the pivot pin 2. Due to the displacement, a length of the pivot pin 2 protruding from the first surface 13 can be adjusted.
The pivot pin 2 has a cylindrical shape and comprises a center axis 3. The above described displacement of the pivot pin 2 can only performed along said center axis 3. To allow displacement along the center axis 3 only, the pivot pin 2 is supported within a hollow protrusion 12. The hollow protrusion 12 is provided on the base plate 2 on the opposite side of the surface facing the cover plate 11. In particular, an axis of a inner cylindrical shape of the hollow protrusion 12 is identical to the center axis 3 of the pivot pin 2.
Further, the hollow protrusion 12 as well as the center axis 3 of the pivot pin 2 is orientated perpendicular to the first surface. Additionally, the adjusting element 4 is also provided perpendicular to the first surface 13. With such a design, an engagement of the pivot pin 2 with the door is made very simple.
The pivot pin 2 is provided slidable within the hollow protrusion 12. A movement of the pivot pin 2 is caused by the adjusting element 4 and transferred to the pivot pin 2 by a connecting element 5. The pivot pin 2 and the connecting element 5 are coupled as follows:
A hole 14, in particular a through hole, is provided within the pivot pin 2. The connecting element 5 comprises an arm portion 6 which has an end portion 15. The hole 14 and the arm portion 6 are both orientated basically perpendicular to the center axis 3 of the pivot pin 2. With the end portion 15 extending into the hole 14, a movement of the pivot pin 2 and the connecting element 5 along the center axis 3 is coupled. In order to allow proper movement of the coupled pivot pin 2 and connecting element 5, a slit 18 is provided within the hollow protrusion 12. The slit 18 is provided within the whole hollow protrusion 12 in parallel to the center axis 3 and may end into a recess provided within the base plate 10 to enlarge the possible amount of displacement of the connecting element 5.
The adjusting element 4 comprises an adjusting screw having a first threat 8, in particular an external threat. The adjusting element 4 is provided within a through hole of the base element 9 and is fixed to the base element 9 via a retaining ring. The retaining ring is a second stopping member 17 for the connecting element 5 which will be described subsequently. With the retaining ring fixing the adjusting element 4 to the base element 9, the adjusting element 4 can be rotated without causing any displacement of the adjusting element 4 with respect to the base element 9.
The first threat 8 is engaged with a second threat 7 of the connecting element 5, wherein the second threat 7 particularly is an inside threat. Since the arm portion 6 of the connecting element 5 extends into the slit 18, the connecting element 5 is prevented from rotation. Therefore, if the adjusting element 4 is rotated, the first threat 8 and the second threat 7 cause a displacement of the connecting element 5 with respect to the base element 9. Due to the coupling of connecting element 5 and pivot pin 2, the rotation of the adjusting element 2 also causes a displacement of the pivot pin 2. The displacement only depends on the pitch of the first threat 8 of the adjusting element 4.
A third threat 19 being an internal threat is provided on the adjusting element. In particular, the third threat 19 extends parallel to the first threat 8. A first stopping member 16 is screwed into the third threat 19. The first stopping member 16 is a screw having a screw head which has a diameter being larger than a diameter of the adjusting element 4. Therefore, the displacement of the connecting element 5 is stopped as soon as the connecting element 5 abuts against the first stopping member 16. In this case, the pivot pin 2 is in a retreat position. Said state is shown in figure 4.
Figure 5 shows the pivot 1 with the pivot pin 2 being in a locking position. In the locking position, the pivot pin 2 is engageable with the door, since in the locking position, the pivot pin 2 protrudes more from the first surface 13 than in the retreat position.
In order to slide the pivot pin 2 from the retreat position (shown in figure 4) to the locking position (shown in figure 5), the adjustment element 4 has to be rotated. Accordingly, the connecting element 5 travels down along the first threat 8 from the first stopping member 16 to the second stopping member 17. The second stopping member 17 is the retaining ring holding the adjusting element 4 onto the base element 9. As soon as the connecting element 5 abuts against the second stopping member 17, the movement of the connecting element 5 is stopped. Since connecting element 5 and pivot pin 2 are coupled, the pivot pin 2 moves together with the connecting element 5 and maintains in the locking position as long as the connecting element 5 abuts the second stopping member 17.

List of reference numerals

1: pivot
2: pivot pin
3: center axis
4: adjusting element
5: connecting element
6: arm portion
7: second threat
8: first threat
9: base element
10: base plate
11: cover plate
12: hollow protrusion
13: first surface
14: hole
15: end portion
16: first stopping member
17: second stopping member
18: slit
19: third threat
100: top pivot (prior art)
200: pivot pin (prior art)
300: rocker (prior art)
400: fulcrum (prior art)
500: screw (prior art)
600: first direction (prior art)
700: second direction (prior art)

Claims

Pivot (1) for a door, especially top pivot, comprising
- a pivot pin (2) having a center axis (3) and being slidable along the center axis (3), wherein the pivot pin (2) is engageable with the door,

- an adjusting element (4) comprising a first threat (8), and

- a connecting element (5) having a second threat (7) being engaged with the first threat (8) such that the connecting element (5) is displaceable by a rotation of the adjusting element (4) with respect to the connecting element (5),

- wherein the connecting element (5) is connected with the pivot pin (2) for coupling a displacement of the pivot pin (2) and the connecting element (5).
Pivot (1) according to claim 1 comprising a base element (9) for supporting the pivot pin (2) and the adjusting element (4), the base element (9) having at least a first surface (13).
Pivot (1) according to claim 2, characterized in that the center axis (3) of the pivot pin (2) is perpendicular to the first surface (13).
Pivot (1) according to claim 2 or 3, characterized in that the pivot pin (2) is slidable between a locking position and a retreat position, wherein in the locking position the pivot pin (2) protrudes more from the first surface (13) of the base element (9) than in the retreat position.
Pivot (1) according to any one of the claims 2 to 4, characterized in that the connecting member (5) abuts against a first stopping member (16) when the pivot pin (2) is in the retreat position and abuts against a second stopping member (17) when the pivot pin (2) is in the locking position.
Pivot (1) according to any one of the claims 2 to 5, characterized in that the adjusting element (4) is accessible for rotating from the first surface (13) of the base element (9).
Pivot (1) according to any one of the claims 2 to 6, characterized in that the base element (9) comprises a hollow protrusion (12) in which the pivot pin (2) is supported.
Pivot (1) according to any one of the previous claims, characterized in that the adjusting element (4) is provided in parallel to the center axis (3) of the pivot pin (2).
Pivot (1) according to any one of the previous claims, characterized in that the pivot pin (2) comprises a hole (14) and an end portion (15) of the connecting element (5) is provided within the hole (14).
Pivot (1) according to any one of the previous claims, characterized in that the adjusting element (4) is an adjusting screw.
Door closer system, comprising a floor-concealed door closer and a pivot (1) according to one of the previous claims.