TWI546099B - Rope clamp - Google Patents

Description

Clamp on the rope

The invention relates to a clamp on a rope comprising: - a fixed body provided with a passage for the rope to pass through, the body being made of an aluminum based material; - a movable starter fixed The ground pivots about the mandrel between the inactive position and the active position, the inactive position is used to insert the cord into the passage, and the active position clamps the rope to the bottom of the passage, said starting The device has a surface opposite the mandrel in the form of a cam designed to contact the rope.

Known clamps (refer to FR 2589211) are formed from a body made of aluminum or an aluminum alloy. Over time, the friction caused by the sliding and jamming of the rope within the channel will cause the aluminum wall to wear gradually.

To compensate for the premature wear of the clamp, the passage is typically provided with an additional aluminum wall thickness, which results in an increase in the overall size and weight of the device.

The object of the invention is to propose a clamp for use on a rope which has an increased strength and an extended service life.

The jig of the present invention is characterized in that the inner wall of the passage is covered by a wear-resistant member made of a material different from aluminum, in particular, the hardness of the material is higher than that of aluminum, or the friction coefficient is lower than that of aluminum. .

According to a preferred embodiment, the wear member is formed from a metal plate that is secured to the inner wall of the passage by a fixture. The metal sheet is advantageously provided with assembly pins which are fixed to the body by welding or forging.

The metal plate is preferably constructed of hardened stainless steel, but any other wear resistant material may be employed.

According to another feature of the invention, the (wear resistant) metal sheet may partially or completely conform to the inside of the passage of the aluminum body.

The metal plate can be replaced by any other wear resistant metal plate.

Other advantages and features of the present invention will become more apparent from the following description of embodiments of the invention.

In Figures 1 to 5, the clamp 10 for the rope 11 is used to provide security for people climbing or working at heights. The jig 10 includes a fixed body 12 made of aluminum or an aluminum alloy, and a movable starter capable of being in an inoperative position for inserting the rope, and an active position for fixing the rope 11. Between and around the first transverse mandrel 14 pivots.

The side portion 12G on the left side of the main body 12 is folded into a U shape, and two aligned holes 15 are drilled in the parallel branches of the U shape for assembling the mandrel 14 of the starter 13.

The side wall 12D on the right side of the body 12 is also folded into a U-shape that depicts the contour of the passage 16 through which the rope 11 passes. The two side portions 12G and 12D are disposed to face each other and are used to accommodate the internal space of the starter 13 to be spaced apart.

The intermediate portion of the body 12 also includes a lower aperture 18 and an upper aperture 17 that are designed to secure a rock nail ring.

Opposite the mandrel 14, the starter 13 is provided with a cam 19 which is designed to clamp the rope against the bottom of the channel 16 in the active position. The cam 19 is advantageously provided with a plurality of tilting clamps which increase the clamping effect of the rope 11. In order to insert the cord 11 into the channel 16, the starter 13 is actuated to an inoperative position by means of an auxiliary lever 21 (refer to Fig. 2) hinged to the second mandrel 22 of the starter.

The inner wall of the channel 16 is advantageously covered by a wear part made of a material other than aluminum. This material can be selected to have excellent resistance to the frictional effects caused by the tension of the cord 11 within the channel 16.

The metal plate 20 has a hardness higher than that of the aluminum body 12, and thus can be assembled as an additional portion to the inner wall. The metal sheet 20 can be fixed to the inner wall of aluminum by any known assembly method, particularly by welding or heading.

In the example of Figures 1 to 5, the metal plate 20 is provided with two assembly pins 23 through the holes 24 of the passage 16 for this purpose. The pin 23 is then forged thick to ultimately secure the metal sheet to the body of the channel 16. The metal plate 20 partially covers the inside of the passage 16, where the friction of the rope 11 is the most severe.

Both ends of the (wear-resistant) metal plate 20 are slightly curved so as to cover the main body 12, and the curved end has a larger radius so that sharp edges are not formed as much as possible (see Fig. 4).

The metal sheet 20 may be hardened stainless steel or other material having a much greater hardness and strength than aluminum. Since the coefficient of friction of the stainless steel metal plate 20 is smaller than the coefficient of friction of the aluminum body 11, it is also advantageous for the rope 11 to slide within the passage 16. Therefore, the life of the jig 10 is extended as compared with the conventional aluminum jig.

According to an alternative embodiment of the invention illustrated in Figures 6 and 7, the metal sheet 120 is U-shaped and thus closely conforms to the entire surface of the channel 16 (which is forcibly joined into the channel).

It will be apparent that the metal sheets 20, 120 can be replaced by any other wear resistant metal members.

10. . . Fixture

11. . . rope

12. . . main body

12D. . . Side wall

12G. . . Side

13. . . Starter

14. . . Mandrel

15. . . Calibration hole

16‧‧‧ channel

17‧‧‧Upper hole

18‧‧‧ lower hole

19‧‧‧ cam

20‧‧‧Metal plates

21‧‧‧ pole

22‧‧‧ mandrel

23‧‧ ‧ sales

24‧‧‧ hole

120‧‧‧Metal plates

Figure 1 is a perspective view of the clamp of the present invention, wherein the rope is incorporated in the passage;

Figure 2 is an exploded perspective view of the jig of Figure 1, in which no rope is shown;

Figure 3 is a plan view of the jig shown in Figure 1, wherein the rope is not shown;

Figure 4 is a cross-sectional view taken along line 4-4 of Figure 3;

Figure 5 is a cross-sectional view taken along line 5-5 of Figure 4;

Figure 6 is a schematic perspective view of an alternative embodiment;

Figure 7 is a plan view of Figure 6 with a U-shaped plate.

12‧‧‧ Subject

13‧‧‧Starter

16‧‧‧ channel

20‧‧‧Metal plates

Claims (8)

A clamp (10) on a rope (11) comprises: a fixed body (12) provided with a passage (16) for the passage of the rope, the body being made of an aluminum based material; an active starter (13), mounted to pivot about a mandrel (14) of the body (12) between an inactive position and an active position, the inoperative position being used to insert a cord into the channel ( 16), the active position clamps the rope (11) in the bottom of the channel (16), the starter having a surface opposite the mandrel (14), the surface presenting being designed to be associated with the rope (11) A contact cam form, characterized in that the inner wall of the passage (16) is covered by a wear-resistant member formed of a material different from aluminum, the wear-resistant member being supported by a metal plate (20, 120) Formed, the metal plate (20, 120) is attached to the inner wall through a fixing device. A jig according to the first aspect of the invention is characterized in that the hardness of the material constituting the metal plate (20, 120) is higher than the hardness of the aluminum. A jig according to the first aspect of the invention is characterized in that the material constituting the metal plate (20, 120) has a coefficient of friction lower than that of aluminum. A jig according to the first aspect of the invention is characterized in that the metal plate (20) is provided with an assembly pin (23) which constitutes a member for fixing by welding or forging. A jig according to claim 1, characterized in that the metal plate (20) is made of stainless steel. A jig as claimed in any one of claims 1 to 5, Characterized in that the metal sheet (20) is shaped to enable the inner wall of the channel (16) to at least partially fit snugly. A jig as claimed in claim 1, characterized in that the metal plate (120) is folded into a U shape for forcibly engaging the inner side of the passage (16). A jig according to the first aspect of the invention is characterized in that both ends of the metal plate (20) are slightly curved so as to cover the main body (12) without forming sharp edges.