Sheave

Abstract

A pulley comprising a wheel or sheave (1) having a central recess (2) and a channel (3); and at least one fastening cable (4) designed for transmitting the force from the sheave (1) to a fastening point, the cable passing transversely to the sheave (1) through the central recess (2); and which incorporates at least one low-friction bushing (6) that is housed between the fastening cable (4) and the sheave (1).

Claims

1. A pulley comprising a sheave (1) without roller bearings that incorporates a central recess (2) and a channel (3); at least one fastening cable (4) configured to transmit the force from the sheave (1) to a fastening point passing transversely to the sheave (1) through the central recess (2); and at least one body having an aperture arranged to guide the fastening cable (4) through the central recess (2); wherein said pulley further comprises at least one low-friction bushing (6) which is housed between the fastening cable (4) and the sheave (1); and wherein the low-friction bushing (6) comprises two opposite sides, wherein a first side is in direct contact with the fastening cable (4) and a second opposite side is in direct contact with the sheave (1) through the central recess (2) in such a way that the low-friction bushing (6) is in a compression state between the fastening cable (4) and the sheave (1) when loaded.

2. The pulley according to claim 1, including at least one body (5) is made of metal, plastic, polymers, wood, resins, or any material with equivalent mechanical characteristics.

3. The pulley according to claim 1, wherein the fastening cable (4) is formed by one or more spliced cables.

4. The pulley according to claim 1, wherein the fastening cable (4) is embedded or fixed in a structure (7) designed for transmitting the generated stresses.

5. The pulley according to claim 1, wherein the low-friction bushing (6) is made of a material with low coefficient of friction that allows the sheave (1) to rotate.

6. The pulley according to claim 1, wherein the sheave (1) is made of metal, plastic, polymers, wood, resins or any material with equivalent mechanical characteristics.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) A series of drawings that help to better understand the invention and that are expressly related to an embodiment of said invention that is presented as a non-limiting example thereof, is briefly described below.

(2) FIG. 1. Shows a first practical embodiment of the pulley subject matter of the present utility model.

(3) FIG. 2. Shows an exploded view of the components that make up the pulley shown in the previous figure.

(4) FIG. 3. Shows a view of the wheel or sheave (1) as part of the pulley presented here.

(5) FIG. 4. Shows a view of a second practical embodiment of the wheel or sheave (1).

(6) FIG. 5. Shows a section of the pulley presented here, and more specifically, a pulley with body (5).

(7) FIG. 6. Shows a particular embodiment of the pulley shown in the previous figure, but with another version of sheave (1).

(8) FIG. 7. Shows a third practical embodiment of the pulley.

(9) FIG. 8. Shows an embodiment of the pulley shown in the previous figure, but with another version of sheave (1).

(10) FIG. 9. Shows a fourth practical embodiment of the pulley, without body.

(11) FIG. 10. Shows an embodiment of the pulley shown in the previous figure, but with another version of sheave (1).

(12) FIG. 11. Shows a fifth practical embodiment of the pulley.

(13) FIG. 12. Shows an embodiment of the pulley shown in the previous figure, but with another version of sheave (1).

(14) FIG. 13. Shows a sixth practical embodiment of the pulley, with a spliced fastening cable (4).

(15) FIG. 14. Shows an embodiment of the pulley shown in the previous figure, but with another version of the sheave (1).

(16) FIG. 15. Shows a seventh practical embodiment of the pulley, with a spliced cable (4) and a body (5).

(17) FIG. 16. Shows an embodiment of the pulley shown in the previous figure, but with another version of the sheave (1).

(18) FIG. 17. Shows an eighth practical embodiment of the pulley, which incorporates two bushings (6) and a body (5).

(19) FIG. 18. Shows a view of the first practical embodiment, with the addition of a second bushing (6) to support a second fastening cable (4).

(20) FIG. 19. Shows a ninth practical embodiment of the pulley, specially designed to be used in cases of embedding.

(21) FIG. 20. Shows a view of the pulley of the previous figure, but with two bushings (6) and separate fastening cables (4).

PREFERRED EMBODIMENT OF THE INVENTION

(22) A preferred embodiment of the invention is shown in the attached figures. More specifically, the pulley object of the present specification is characterized in that it comprises a wheel or sheave (1) that incorporates a central recess (2) and a channel (3) to divert at least one fastening cable (4); and wherein it may optionally contain a body (5), and at least one low-friction bushing (6).

(23) The fastening cable (4) is configured as an element that provides the transfer of effort from the wheel (1) to a fastening point, passing transversely to the sheave (1) through the central recess (2).

(24) The low-friction bushing (6) is housed between the fastening cable (4) and the wheel or sheave (1). The function of said bushing (6) is to decrease the friction force between the fastening cable (4) and the sheave (1) by creating a substrate that prevents direct contact between the cable (4) and the sheave (1), which provides low friction.

(25) In load situation, the bushing (6) is in a compression state between the cable (4) and the sheave (1).

(26) In a practical embodiment, the bushing (6) is in direct contact on one side with the cable (4), and on the other with the sheave (1) through the central recess (2).

(27) In a preferred embodiment, the bushing (6) will be made of a material with low coefficient of friction, also acting as a sacrificed piece as it is not a vital piece in the structural integrity of the pulley, which in turn allows the sheave (1) to rotate.

(28) The body (5) will not possess any primary structural characteristics, its objective being to guide and protect the other components of the pulley.

(29) The fastening cable (4) does not have specific characteristics for its correct operation, which gives it greater versatility, since it is possible to use any type of cable, depending on the load that needs to be applied to the system.

(30) The body (5) and the sheave (1) may be made of various materials, such as metal, plastics, polymers, wood or any material with equivalent mechanical characteristics.

(31) FIGS. 5 and 6 show detailed views of a second practical embodiment of the pulley, with two versions of sheave (1). These figures show how the fastening cable (4) passes transversely both to the body (5) and to the central recess (2) of the sheave (1), and where the bushing (6) is contained between the fastening cable (4) and the sheave (1), thus using the body (5) as a guide for said cable (4), while protecting the components of the pulley.

(32) FIGS. 7 and 8 show how the body (5) acts as a guide for the cable (4) in a steeper way than in the previous case, which would allow to implement the body in a slightly smaller size, giving more protection to the cable (4).

(33) FIGS. 9 and 10 show an embodiment of the pulley, without the body (5), which allows to simplify its structure without sacrificing its stability and durability characteristics.

(34) FIGS. 11 and 12 show an embodiment of the pulley with a body (5) smaller than in previous cases, so that the sole purpose of the body (5) is to guide the cable (4).

(35) FIGS. 13 and 14 show an embodiment where the fastening cable (4) is formed by several spliced cables, and where the point where they are spliced will provide the unity of the components.

(36) FIGS. 15 and 16 show another embodiment for spliced cables which does incorporate a body (5) that guides the spliced cable (4).

(37) FIGS. 17 and 18 show an embodiment of the pulley which incorporates several bushings (6), and where, more specifically, FIG. 17 shows a version with several bushings (6) and spliced fastening cables (4), while FIG. 18 shows a version in which the second bushing (6) allows adding another fastening cable (4) to the pulley.

(38) Finally, FIGS. 19 and 20 show an embodiment of the pulley where the pulley is fixed to other components.

(39) More specifically, FIG. 19 shows how said fastening is made by means of the fastening cable (4), being embedded or being fixed in a structure (7) designed for transmitting the generated stresses.

(40) While FIG. 20 shows a version of the previous solution, but with the inclusion of a second bushing (6) that allows its use in cases where the pulley requires greater fastening or less freedom of movement, without interfering with the rotation of the sheave (1).