DETACHABLE CENTRIFUGAL BRAKE FOR LIFT EQUIPMENT

Abstract

A detachable centrifugal brake (1) provided for lift equipment, comprising a central core (2) linked to a rotation shaft attached to motor means, an inner drum (4) having a contact surface provided to come into contact with brake elements which act due to the effects of centrifugal force. Furthermore, releasable coupling means are provided for locking/unlocking the inner drum (4) with respect to a stationary portion externally enveloping the inner drum (4), such that in a first operating position the inner drum (4) is integrally coupled to the outer drum while in a second operating position the inner drum (4) is free to rotate on its own shaft by means of the arrangement of rotation means. The coupling means include actuation means which act on the coupling means.

Claims

1. A detachable centrifugal brake (1) for lift equipment, comprising a central core (2) linked to a rotation shaft attached to motor means, an inner drum (4) having a contact surface provided to come into contact with brake elements which act due to the effects of centrifugal force, including releasable coupling means for locking/unlocking the inner drum (4) with respect to a stationary portion externally encompassing the inner drum (4), such that in a first operating position the inner drum (4) is integrally coupled to an outer drum (6) while in a second operating position the inner drum (4) is free to rotate on its own shaft by means of the arrangement of rotation means, wherein the coupling means include actuation means which act on the coupling means, characterised in that the coupling means comprise a retention system for locking the inner drum (4), such retention system being able to be actuated due to the effects of the actuation means, the retention system having a toothed region (8) linked to the inner drum (4) wherein a toothed section (90) linked to the actuation means is able to be coupled, comprising the actuation means a pin (9) adjustable in position including a toothed section (90) able to be coupled in a releasable manner with the toothed region (8) of the inner drum (4), the pin (9) being housed in a housing present in the outer drum (6) and wherein the pin comprises two recesses present along the length thereof, being configured to couple an additional pin (12), wherein each of the recesses corresponds to a corresponding operating position.

2. The centrifugal brake (1) according to claim 1, characterised in that the rotation means comprise at least one bearing (7) which is arranged between the central core (2) and the inner drum (4).

3. The centrifugal brake (1) according to claim 1, characterised in that the toothed region (8) is arranged along the entire perimeter length of the inner drum (4).

4. (canceled)

5. The centrifugal brake (1) according to claim 1, characterised in that the actuation means comprise elastic return means located inside the housing, which act on the pin (9).

6. (canceled)

7. The centrifugal brake (1) according to claim 1, characterised in that the actuation means comprise an additional pin (12) present in a second housing made in the outer drum (6), being insertable into one of the recesses made in the pin.

8. The centrifugal brake (1) according to claim 5, characterised in that the additional pin (12) is arranged perpendicularly with respect to a longitudinal axis of the pin (9).

9. The centrifugal brake (1) according to claim 5, characterised in that elastic return means are included which act on the additional pin (12).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1—Is a perspective view of a detachable centrifugal brake according to the present invention, intended to be mounted in lift equipment;

[0025] FIG. 2—Is a front elevation view of the centrifugal brake shown in FIG. 1;

[0026] FIG. 3—Is a cross-sectional perspective view of the centrifugal brake along the line A-A indicated in FIG. 2;

[0027] FIG. 4—Is a transverse cross-sectional view of the centrifugal brake corresponding to a position wherein the inner drum is locked; and

[0028] FIG. 5—Is a transverse cross-sectional view of the centrifugal brake corresponding to a position wherein the inner drum is unlocked, meaning, it can rotate freely.

DESCRIPTION OF A PREFERRED EMBODIMENT

[0029] In light of the aforementioned figures, and in accordance with the adopted numbering, one may observe therein an example of a preferred embodiment of the invention, which comprises the parts and elements indicated and described in detail below.

[0030] As shown in the present embodiment, a detachable centrifugal brake, generally indicated with the reference (1), is provided to be mounted in lift equipment (not shown). This centrifugal brake (1) comprises a central core (2) having a central housing (3) foreseen to couple a rotation shaft (not shown) attached to motor means, an inner drum (4) arranged around the central core (2) having a contact surface (20) provided to come into contact with brake elements (5) (masses). These two brake elements (5) are spaced apart from each other, being present along the perimeter edge in the central core (2) acting due to the effects of centrifugal force during the actuation of the centrifugal brake (1).

[0031] In order to lock/unlock the inner drum (4) with respect to an outer drum (6) externally encompassing the inner drum (4), releasable coupling means are provided, such that in a first operating position (see FIG. 4) the inner drum is integrally coupled to the outer drum (6) while in a second operating position (see FIG. 5) the inner drum is free to rotate on its own shaft by means of the arrangement of rotation means. The coupling means include actuation means which act on the coupling means.

[0032] To facilitate the rotating action of the inner drum (4) during the position wherein such inner drum (4) is unlocked, a ball bearing (7) is provided which is arranged in a housing located between the central core (2) and the inner drum (4).

[0033] Regarding the coupling means, they comprise a retention system for locking the inner drum (4), said retention system being able to be actuated due to the effects of the actuation means that will be detailed later.

[0034] This retention system has in particular a toothed region (8), arranged along the entire perimeter length of the inner drum (4) wherein a toothed section linked to the actuation means is able to be coupled.

[0035] Now, regarding the actuation means, they comprise a pin (9) that can be adjusted in position, which includes a toothed section (90) at one of the ends thereof, dimensionally configured to be coupled to the toothed region integrally secured to the inner drum (4), the pin (9) being housed in a housing (10) present in the outer drum (6). Additionally, elastic return means are provided which consist of an elastic spring (11) which is located inside the housing (10), which act on the pin (9).

[0036] As seen more clearly in FIGS. 3 to 5, the pin comprises two recesses (91, 92) present along the length thereof, being configured to couple an additional pin (12). Such two recesses (91, 92) determine the locking or unlocking position of the inner drum (4) with respect to the outer drum (6).

[0037] Furthermore, the actuation means comprise an additional pin (12) present in a second housing (13) made in the outer drum (6), being insertable into one of the recesses (91, 92) made in the pin (9). In this manner, in order to move the pin (9), the additional pin (12) must be moved outwards beforehand.

[0038] In FIG. 4, the inner drum is in a locked position, such that the additional pin (12) is coupled in the recess (91). On the contrary, in FIG. 5, the inner drum is in an unlocked position, meaning, it can rotate freely, such that the additional pin (12) is coupled in the recess (92).

[0039] As seen, the additional pin (12) is arranged perpendicularly with respect to a longitudinal axis of the pin (9), including elastic return means consisting of a helical spring (14) arranged around a section of the additional pin (12) and located in a housing located in the outer drum (6). The helical spring (14) is abutting on one end with the wall of the housing while the opposite end is in contact with a projection (122) jutting out of the perimeter of the additional pin (12).

[0040] The details, shapes, dimensions and other accessory elements, used to manufacture the detachable centrifugal brake of the invention, may be suitably substituted for others which do not depart from the scope defined by the claims which are included below.