FI59470C - DRAGFJAEDERANORDNING - Google Patents

Description

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Patent weddelat '(51) Kv.lk?/1nt.CI.3 F 16 G 13/24 FINLAND — FINLAND (M) f ***** ™ * —26U7 / 72 (22) Hakamtapllvt — AmMcnkifNag 26.09 -72 ( 23) The beginning of the cloud — GIMgh «t * daf 26.09.72 (41) Tullut | ulkl« * ksl - BIMt offantllg 31.03.73

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Patani och rufictantyralaan '' AnattkM «hfd och utUkiUMn public ^ 30.OU.8l (32) (33) (31) Muoikmi — e * | lrd priority 30.09.71 10.12.71, 07.0U.72 Sweden-Sweden (SE) 12358/71 158U3 / 71, UU83 / 72 (71) Forsheda Ideutveckling AB, Hornarydsvägen 1, 331 00 Värnamo, Sweden-Sweden (SE) (72) Karl Gustav Einar Derman, Partille, Nils-Erik Bohman, Värnamo,

This invention relates to a tension spring device for use, e.g. as a towing or mooring rope device, comprising a flexible traction element, e.g. a rope or a chain, and an elastic spring element, wherein the traction element is at least two connected to the spring element at a point spaced apart.

It is often desirable to provide a rope, chain or the like for receiving tensile stresses with a spring element so that strong jerks in the rope or chain are avoided or the chain is kept under constant tension. This is of great importance, for example, when a rope or chain is used for towing or mooring boats and tent ropes.

From many points of view, it is advantageous to use a rubber spring element e.g. taking into account that the elastic movement becomes silent and no abrasion of the boat occurs. However, due to the relatively low tensile and tear resistance of the rubber, it is difficult to attach the rope or chain to the rubber spring in the conventional manner.

2,59470

The object of the invention is to provide a tension spring device where this problem is solved.

In order to satisfy the object of the invention, a tension spring device is provided, characterized in that the tension element travels between the joints in a substantially helical path, the tension element being in contact with the spring element at least in the loaded state of the tension spring device.

Such a tension spring device may comprise a rubber body as a spring element, the traction element, mainly a rope, running inside the rubber body in the region of its other end and then on the outer surface of the rubber body and helically around it, after which the traction element travels inside and

It has been preferred that the rope at the points where it passes inside the rubber body be locked here. This ensures that the tension spring device returns to its original length after being subjected to tensile stress. The rope can be locked to the rubber frame in such a way that the rope in the unloaded state of the tension spring device runs around the rubber frame at a small distance therefrom.

It is also possible to make an outwardly open, helical groove in the outer surface of the rubber body in which the rope is inserted.

Especially when the tensile spring device has to receive large tensile loads, it is suitable that the tensile element passes between the points from which it is connected to the spring element. The tension spring device is then best made of a rubber body, inside which the length of the rope is vulcanized, whereby the rope of the vulcanized part of the rubber runs in a twist or the like. The coil can be helical or sinusoidal. A tension spring device such as the latter is suitable as a buoy attachment.

The invention is described in more detail below with reference to the accompanying drawings.

Figure 1 shows the end of a spring element in a first embodiment of a tension spring device according to the invention.

Figure 2 shows a section of the end of a spring element in a further embodiment of a tension spring device according to the invention.

Figure 3 shows the end of a spring element in a tension spring device according to the invention.

Figure k shows a section of said end provided with a rope passing through it.

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Figure 5 shows the reinforcement element of the end part.

Figure 6 shows a section of the end of a spring element provided with such a reinforcing element.

Figures 7, 8 and 9 show alternative embodiments of a spring device according to the invention.

The spring device shown in Figure 1 can be used, for example, as a towing or fastening device. The device comprises a rope 2, which is of the conventional type, and a spring element 16, which is mainly rubber. The spring element 16 is substantially rod-shaped and has a cylindrical central part 18 and two end parts 20 with a larger diameter, only one of which is shown. The end part 20 has a hole 22 oriented transversely to the symmetrical longitudinal axis of the spring element, through which the rope 2 passes. From the hole 22, the rope passes in the form of a helical line the desired number of turns around the cylindrical central part 18. The rope then passes into a hole in the second end portion of the spring element and extends out of this end portion in the axial direction. When the rope is pulled from either side of the spring element 16, the rope turns around the central part 18 compress the central part 18 to an elastic size at the same time as the end parts are pulled somewhat apart and twisted relative to each other in such a way as to unwind the rope. Thus, a spring effect is obtained, which thus forms a combination of compressive stress, tensile stress and torsional stress in the spring element.

In certain cases, for strength reasons, it may be desirable to provide the spring element according to Figure 2 with an end sleeve, which is a harder material, e.g. plastic, than the spring element otherwise, which may be rubber. Figure 2 shows a section of one end of such a spring element. A hole 28 is made in the sleeve 2h, which is connected to a hole 30 in the wall of the rubber element 26. The sleeve 2b has a part 32 which must be inserted into a corresponding recess in the end face of the rubber element. The rope 2 runs in and around the spring element in the same way as the rope in the embodiment according to Fig. 1.

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In one embodiment of the described tension spring device, the tension element, 30. in the case shown, is a rope, firmly connected to the spring element, i. rubber trunk-sized, at the ends of said non-straight track. Figures 3-6 show how the rope can be connected to the spring element when it is necessary to provide a locking of the rope in this respect. Both end portions of the spring element are shaped in the same way, so that only the second end portion is shown in Figures 3,4 and 6. The end portion nn of the spring element 36 is provided with three parallel holes 38 through which the rope 40 passes substantially tortuous. As can be seen in particular from Figure 3, the rubber material has been removed between the two adjacent holes to form notches 42 and 44 so that at least part of the rope cross-section fits there »There is a corresponding notch 46 next to the hole closest to the end of the spring element 4Ö, which relates to the helical line along which the rope passes between the end portions provided with holes in the spring element.

In order to increase the durability of the main parts, it may be suitable to provide each of these with a reinforcing element 50 »which is similar to that shown in Fig. 5. The reinforcing element 50 is vulcanized inside the rubber as shown in Fig. 6, i. so that the holes with a somewhat larger diameter than the holes in the spring element are concentric with respect to them.

The illustrated connection of the rope to the spring element provides a locking of the rope in this respect when the tension spring device is subjected to traction. This ensures a complete return to the initial situation when the attraction ceases.

Said, locked connection of the rope to the spring element can, as mentioned, also take place in another way, e.g. by connecting the rope to the spring element by means of a half-knot at its ends.

In the case where the rope is locked to the ends of the spring element in this way, the rope can pass between the locks of the spring element in such a way that it is at a small distance from the cylindrical central part of the spring element in the unloaded state of the tension spring device.

In the embodiment of the invention shown in Fig. 7, the rope 52 extends outwards in an open, helical groove 54 * Thus, the rope is effectively protected from damage. Thus, a somewhat different spring characteristic is obtained in the tension spring device, since no movement of the rope along the spring element takes place. Thus, the tension spring device according to Fig. 7 becomes somewhat less progressive than in the embodiment according to Fig. 1. Also in the embodiment shown in Fig. 7, the rope can be connected to the ends of the spring element by means of an arrangement similar to that shown in Figs. 3-6. The rope can travel with respect to the spring element so that it travels a small distance from the bottom of the groove in the unloaded state of the tension spring device.

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Figure 8 shows a tension spring device, which is particularly suitable for cases where the tension spring device is exposed to high tensile forces. For example, this device can be formed of a rope, e.g. a wire 56, the length of which is surrounded by an element of elastic material 33. The elastic material is primarily rubber and the rope 36 is primarily vulcanized into the rubber in a helical path. However, the rope may have a different direction from the straight line, e.g. a sinusoidal track. In the case where the rope is vulcanized inside the rubber, no special locking of the rope to the rubber at the ends of the rubber body is generally required, but still in this case it is possible to provide a secure locking of the rope to the rubber body at its ends. Such a tension spring device becomes very rigid when using normal rubber grades on an elastic spring element.

Fig. 9 shows a tension spring device in which the tension element, as in the case of the embodiment according to Fig. 8, is surrounded by a spring element along its entire length. The traction element is a chain 60, the links 62 of which are flexibly connected to each other. In part of its length, the chain 60 is surrounded by an elastic material, primarily rubber, to form an elastic spring element 64. The chain 60 is connected to the spring element 64 * in such a way that the loops in the unloaded state of the tension spring device form an angle with each other. Thus, the chain 60 has a tortuous passage inside the spring element.

The invention may be modified within the scope of the following claims.

Claims (11)

6,59470 A tension spring device for use, e.g. as a towing or mooring rope device, comprising a flexible traction element, e.g. a rope or a chain, and an elastic spring element, the traction element being connected to the spring element at at least two spaced points, characterized in that the traction element (2; 1+ 0; 52; 56) a substantially helical path runs between the joints, the tensile element being in contact with the spring element (16; 26; 36; 58) at least in the loaded state of the tension spring device. Tensile spring device according to Claim 1, characterized in that the tensile element (2; 1 + 0) extends around the spring element (16; 26; 36). Tensile spring device according to Claim 2, characterized in that the spring element (16; 26; 36) is rod-shaped and has a substantially cylindrical central part (18) and two end parts (20; 2h) with a larger diameter, which of the connection points are provided with holes. (22; 28, 30; 38) through which the traction element passes. 1+. Tensile spring device according to one of the preceding claims, characterized in that the tensile element in the unloaded state of the tension spring device is spaced from the spring element between the connection points. Tensile spring device according to one of the preceding claims, characterized in that the tensile element (52) runs between the connection points in an outwardly open helical groove (5 * 0 ·) made in the spring element. Tensile spring device according to Claim 5, characterized in that the tensile element (52) in the unloaded state of the tension spring device is spaced from the bottom of the groove (5). Tensile spring device according to Claim 1, characterized in that the tensile element (56) runs between the connection points inside the spring element (58). Tensile spring device according to one of the preceding claims, characterized in that the tensile element (1 + 0; 56) is permanently connected to the spring element (36; 58) at the connection points. Tensile spring device according to Claim 8, characterized in that the tensile element (1 + 0) in each connection passes torsionally through at least two substantially parallel holes (38) in the spring element. Tension spring device according to one of the preceding claims, characterized in that the spring element (36) is provided with a reinforcing element (50) at the connection points. Tension spring device according to one of the preceding claims, characterized in that the spring element (16; 26; 36; 58) is made of rubber. 7 59470