BALANCER

Abstract

The invention relates to a balancer (1) for a movable component with a component weight, having a spindle mechanism (32), on the rotation element (34) of which the component can be suspended, and at least one compression spring (30) which is connected, at one of its ends (29), to a translation element (36) of the spindle mechanism, wherein the compression spring is able to be compressed by means of the translation element in the event of a rotation of the rotation element brought about by the component weight.

Claims

1. A balancer (1), in particular a spring balancer or a zero-gravity balancer, for a movable component with a component weight, having a spindle mechanism (32) with a translation element (36) and a rotation element (34), on which the movable component can be suspended, and at least one compression spring (30) which is connected, at one of its ends (29), to the translation element (36) of the spindle mechanism, wherein the compression spring is able to be compressed by means of the translation element in the event of a rotation of the rotation element brought about by the component weight.

2. A balancer according to claim 1, wherein the spindle mechanism (32) has a movement thread (38).

3. A balancer according to claim 2, wherein the movement thread is in the form of a ball screw.

4. A balancer according to claim 2, wherein the movement thread is in the form of a roller screw.

5. A balancer according to claim 1, wherein the rotation element (34) has a spindle and the translation element (36) has a spindle nut.

6. A balancer according to claim 5, wherein the compression spring is arranged coaxially with the spindle mechanism and radially outside the circumference of the spindle.

7. A balancer according to claim 1, wherein the compression spring and the translation element are connected by means of an abutment element (44) which butts against one end (29) of the compression spring and is connected to the translation element.

8. A balancer according to claim 1, wherein a longitudinal axis of movement of the translation element extends parallel to the longitudinal axis of the compression spring.

9. A balancer according to claim 1, further comprising a spring carrier (8) on which the compression spring is arranged in a rotationally fixed manner at the other of its ends (31) and on which the rotation element is mounted in a rotatable manner.

10. A balancer according to claim 1, wherein more than one compression springs are arranged parallel to one another and in an equally spaced manner in the circumference of the spindle mechanism.

11. A balancer according to claim 10, wherein each of the compression springs is arranged around a bolt (26) which is firmly connected to the spring carrier.

12. A balancer according to claim 11, wherein the compression spring and the translation element are connected by means of an abutment element (44) which butts against one end (20) of the compression spring and is connected to the translation element, and, wherein the translation element is connected to at least one of the bolts directly or indirectly by means of the abutment element in a rotationally fixed manner, but so as to be free in the compression direction.

13. A balancer according to claim 1, wherein the rotation element is connected in a rotationally fixed manner to a cable drum (40).

14. A balancer according to claim 13, wherein the cable drum is cylindrical.

15. A balancer according to claim 13, wherein the cable drum is conical.

16. A balancer according to claim 13, wherein a cable receptacle (42) is arranged at the circumference of the cable drum (40).

17. A balancer according to claim 16, wherein the cable receptacle is spiral-shaped.

18. A balancer according to claim 13, wherein the rotation element is able to be temporarily decoupled in terms of rotation from the cable drum by means of a setting device (10) and is rotatable with respect to the translation element.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Exemplary embodiments of the invention are described in more detail in the following text with reference to the appended drawings, in which:

[0026] FIG. 1 shows a front view of an example of a balancer according to the invention;

[0027] FIG. 2 shows a side view of the balancer from FIG. 1;

[0028] FIG. 3 shows a sectional view along the section A-A indicated in FIG. 1; and

[0029] FIG. 4 shows a rear view of the balancer from FIG. 1.

DESCRIPTION OF THE FIGURES

[0030] FIG. 1 shows a front view of a balancer 1 in the form of a spring balancer. In FIG. 2, the same balancer 1 is illustrated in a side view.

[0031] The external components of the balancer 1 can be seen in both figures. A suspension device 4 having a snap hook 6 is arranged on a housing component 2, configured in a pot-like manner, of a housing 3, it being possible to suspend the balancer 1 for example on a ceiling beam or on a frame by means of said suspension device 4.

[0032] The housing 3 also has a spring carrier 8 which is configured as a housing cover and is screwed together with the housing component 2 in the exemplary embodiment (cf. FIG. 3). Also arranged on the housing component 2 is a setting device 10 for setting a preload of the compression springs.

[0033] The compression springs and the spindle mechanism are arranged inside the housing 3 and are therefore not visible in FIGS. 1 and 2.

[0034] From a not directly visible recess 12 in the housing 3 there extends a cable extension 14 having a snap hook 16 for suspending the component having the weight to be balanced (not illustrated), for example a manufacturing tool.

[0035] The cable extension 14 also has a cable lock 18 which limits retraction of the cable 20 of the cable extension 14 into the interior of the housing. The cable lock is appropriate in the exemplary embodiment because the compression springs are preloaded (that is to say already compressed in the rest state), and thus retract the cable when a component having a certain component weight is not fastened thereto.

[0036] It is additionally apparent from FIG. 2 that a spindle bearing 22 and fastening nuts 24 for bolts 26, which serve as a twist prevention means for the compression springs 30, are arranged on the spring carrier 8 configured as a housing cover.

[0037] FIG. 3 shows a sectional view along the section A-A indicated in FIG. 1, and thus the interior of the housing 3.

[0038] In the exemplary embodiment, six compression springs 30 are arranged in each case about a bolt 26, wherein the bolts are firmly connected to the spring carrier 8. The housing component 2 is in turn firmly connected to the spring carrier 8. Each of the compression springs 30 bears with its one end 29 against the receiving element 44 and with its other end 31 against the inner side of the spring carrier 8.

[0039] In the exemplary embodiment, a spindle mechanism 32 is arranged in the interior of the housing 3, which has a spindle 34 and a spindle nut 36. Arranged between the spindle 34 and the spindle nut 36 is a movement thread 38, configured as a ball screw, having a constant thread pitch (illustrated only in a very simplified schematic manner).

[0040] The spindle 34 is mounted in the spindle bearing 22 in a rotatable manner with respect to the spring carrier 8 and thus the compression springs 30 andat least in the operating stateis connected to a cable drum 40 in a rotationally fixed manner. The cable drum 40 has a conical circumference and a spiral-shaped cable receptacle 42 in the exemplary embodiment; however, other exemplary embodiments having a cable drum with a cylindrical circumference are also provided.

[0041] An abutment element 44, which is configured as a circular perforated plate, has a through-hole for each bolt 26 and against which the compression springs 30 bear with their ends 29 under a compressive preload, is arranged at the spindle nut 36 in a rotationally fixed manner and around the entire circumference. The abutment element 44 is welded to the spindle nut 36 in the exemplary embodiment, but can also be firmly connected thereto in some other suitable way.

[0042] During operation of the balancer 1, it is thus possible for the cable drum 40 to be twisted together with the spindle 34 relative to the compression springs 30 that are rotationally fixed to the housing. This takes place during typical applications of the balancer 1, for example when a manufacturing tool or some other component having a relevant component weight is suspended in the hook 16. Then, via the cable extension 14, the cable 20 of which is guided in the cable receptacle 42 and is fastened thereto, the cable drum 40 is rotated on account of the acting gravitational force of the component. The pitch direction of the movement thread 38 is selected such that, during extension of the cable extension 14, the spindle nut 36 is moved to the leftin the drawing planethat is to say equally towards the spring carrier 8. The compression springs 30 are compressed in that the movement in translation of the threaded nut 36 is transmitted to the springs via the abutment element 44.

[0043] With further deflection of the cable drum 40, the spindle 34 rotates ever further; the threaded nut 36 arranged in a manner rotationally fixed to the housing is in this case deflected proportionally ever further towards the left by the action of the movement thread 38. The compressive spring force applied to the abutment element 44 by the compression springs 30 increases linearly ever further with compression, in accordance with the spring force laws. This process only stops when the spring force, counteracting the weight force of the component, of the compression springs has increased to such an extent that it balances the weight force. In this state, the balancer can fulfill its functions mentioned at the beginning.

[0044] On that side of the housing 3 that is remote from the spring carrier 8, a setting device 10 can be provided, by means of which the rotationally fixed connection between the cable drum 40 and the spindle 34 can be suitably temporarily cancelled, and in this preload state, the spindle 34 can be rotated without the cable drum 40 being twisted, this resulting in displacement of the rest position, predefined by the cable lock 12, of the spindle nut 36 and thus in an altered preload of the balancer 1. The necessary rotary decoupling of the spindle 34 and of the cable drum 40 can take place for example via an engageable and disengageable spline toothing between the two components. The coupling mechanism is then part of the setting device 10.

[0045] Alternatively, the preload can also be changed by changing the position of the cable lock 12 along the cable 20.

[0046] In FIG. 4, the balancer 1 from FIG. 1 is shown in a rear view. In this case, in particular the spring carrier 8, the bolts 26 and the spring bearing 22 are readily apparent. In addition, the uniform distribution of the bolts 26 and thus of the compression springs 30 in the circumference of the spindle 34 is apparent.