HU210372B - Central clamp of snow bridles fixable onto tyre of vehicles - Google Patents

Abstract

The invention concerns a snow strap element for fixture to rubber tyres of vehicle wheels, with a central clamping mechanism, in the hub portion of which strap sections designed as toothed racks, mutually arranged in pairs and free to move in opposite directions, engage with pinions fixed to a common axle. The invention is characterized in that one end of a clamping spring (13) is connected to the shaft (12) of the pinions (11), while the other end of the clamping spring (13) is secured to an actuating plate (4), whereby the hub portion (6) of the clamping mechanism and the actuating plate (4) are connected to one another via a releasable ratchet look. The snow straps (1) preferably are fitted with exchangeable strap inserts (2) which are elastically held by strap springs (3), whereby the gripping edges applied to the roadway lie in the same plane. Between the snow straps (1) it is advantageous to fit a spanning strap (24) made of plastic or rubber, which forms a shell over the wheel tread.

Description

BACKGROUND OF THE INVENTION The present invention relates to a central clamping mechanism for snowmobiles mounted on a tire of a vehicle wheel, which engages the rack shafts in a clamping mechanism for a gear mounted on a common shaft.

A feature of the clamping device of the present invention is the dual-controlled handlebar combination with the pre-tensioned clamping spring, which makes the use and handling of the snow bar assembly safer and more comfortable compared to prior art solutions.

As is known, to prevent a vehicle from being stuck on a snowy, icy road, a tire on a bent wheel of a motor vehicle is a so-called. snow chains are usually fitted. The use of snow chains, while undoubtedly fulfilling its function, has significant disadvantages. Due to the cumbersome removal and dismantling of the snow chain, its use is cumbersome and, when mounted on wheels, often causes unnecessary damage to the tires and the road surface, limiting transport opportunities.

Solutions to the difficulty of handling snow chains are those solutions where the ends of the tire mounts on the tire tread to ensure proper grip of the wheels. There are various solutions for attaching the snow studs to the tire.

U.S. Pat. No. 3,120,256. In the solution described in U.S. Pat. This solution can not eliminate the disadvantages of using snow chains and does not safely fix the lugs.

DE-AS 1 801 319. In the solution disclosed in the patent, the shaft of the shackles is provided with a rack tooth. The shackles are moved and fixed to the tire with gears mounted on a common shaft. A helical spring is attached to the gear shaft, the free end of which can be rotated so that the rack-shaped brackets can be moved radially so that the ends of the shackles can be tensioned on the tire circumference. The clamping mechanism is fixed so that the free end of the tensioned spiral spring can be attached to one of the clamping arms.

The latter solution makes attaching or removing the linkage to the tire an easy, quick operation, thus eliminating the difficulty of using snow chains. However, this is not a perfect solution because the tensioning of the coil spring tensioning the clamps to the tire can vary within extreme limits when coupling the clamp structure to the tire. This is due to the fact that the spring end can be hooked to the relatively spaced link arms. The attachment person can thus fasten the linkage to the wheel of the vehicle with less tension than necessary, which endangers the safety of use. Optimal tensioning force may require significantly more force when hinging the spring end, which makes it difficult to secure, and a springback that may rebound can cause more serious accidents.

The invention is based on the discovery that the spiral spring of the clamping device is pre-tensioned and actuated by means of a control dial, and that the locking mechanism is extremely comfortable and safe by preventing the rotation of the control dial by means of a release handle.

It is an object of the present invention that the other end of a pinion spring (preferably a spiral spring) connected to a gear shaft moving gear rack shafts is secured to a control disk, and the hinge guide bar and the control disk are connected to each other via a release handle.

The invention will be explained in more detail with reference to the embodiments shown in the following figures:

Figure 1 is a front view of a snow bar construction with a clamping device according to the invention

Figure 2 is a side view of a snow bar construction with a clamping device according to the invention

Figure 3 is an axial sectional view of a clamping device according to the invention

Figure 4 is a sectional view of the release latch according to the invention

In Fig. 1, the brackets 1 with the shoe inserts 2 and the shackle springs 3, the clamping control dial 4 and the mode change dial 5, and in the sectional view, the shaft 12 are provided with gears 11 and toothed shackles 10.

Figure 2 is a side view of the hub portion 6 of the central clamping device. It can be seen from the figures that in the hub part 6 of the clamping mechanism, the gear rack shafts are coupled to the gear wheels 11 mounted opposite to each other for opposite movement. It can also be seen that the rack-shaped legs of the brackets 1 are guided by the tongue guide cups 7 and the tongue guide grooves 10 of the tongue guide dial 9 so that the brackets 1 connected to the same gear 11 can move in pairs in the same plane (orthogonal).

The tongue guide cup 7 and the tongue guide wheel 9 can be pivoted 90 ° relative to each other, together with the tongues 1 guiding them in pairs, thereby reducing the storage space of the tongue assembly.

Fig. 3 is an axial sectional view showing the clamping spring 13 (helical spring), the inner end of which is secured to the shaft 12 via an intermediate component and the outer end of which is fixed to the operating disc 4. A coaxial recess 8 is formed on the side of the lever guide cup on the side of the dial 4 for receiving the clamping spring 13 and the multi-component handle, to which the inner toothed latch wheel 14 is fastened. On the inside of the control dial 4, the pivot arms 15 and the handle springs 19 are pivotally mounted on pins. Figure 4 illustrates the structure of the release handle. In this figure, the lever control arms 17 are pivotally mounted on pins fixed to the lever arms 15, delimited by stop surfaces. The lifting springs 18 are pre-tensioned between the latch arms 15 and the latch control arms 17, which engage with their abutment surfaces.

HU 210 372 Β

Figure 4 also shows that a shaft 21 is mounted on the shaft 12, the stop cams 22 of which can be supported by the stop pins 23 on the control disk 4 as a result of the pre-tensioning of the clamping spring 13. The stop cams 22, supported by the stop pins 23, hold the lever handle 17 in a raised position.

The lifting pins 20 extending from the locking pivot mode switch 5 relative to the control dial 4 to the operating area of the ratchet are also suitable for lifting or holding the ratchet control levers 17 in a raised position.

The clamping device according to the invention is actuated by engaging the two-position mode dial 5 and rotating the control dial 4.

The clamping latch is unlocked before being placed on the tire. The control wheel 4 and, with it, the shaft 12 with all the gears can then be freely rotated in both directions. The unlocked position of the ratchet is ensured by the raised position of the ratchet control levers 17 which is at maximum distance from the shaft 12 by pulling the pre-tensioned spring springs 18 against the ratchet springs 19 and retaining the ratchet ends 16, They stand out.

Both the cams 22 and the pins 20 extending from the mode switch 5 to the operating area of the ratchet can cause the ratchet control levers 17 to be raised or held in high position, so that the ratchet structure described herein can be considered as a double-controlled ratchet.

The snow bar assembly mounted on the tire can be precisely fitted to the tire tread by rotating the control dial 4 and then placed into locking mode by switching the mode dial 5. After the mode change, the lever handle 17 will continue to be held in the raised position by the stop cams 22 resting on the stop pins 23, so that the handle will remain in the unlocked position. For the purpose of forcefully rotating the control wheel 4, the brackets 1, which are prevented from moving further on the tire tread, prevent further rotation of the shaft 12 and the cam 21 through the associated gears 11. However, the control dial 4 can be further rotated against a pre-tensioned clamping spring 13 to the extent of the clamping force required for secure fastening. The stop pins 23 thus move away from the cams 22 of the cam 21, stop the lever handle 17 from being lifted, and the actuating handle prevents the locking lever 4 being rotated in the closing direction to be rotated.

Two or three clicking sounds indicate the operation of the handle and the secure attachment of the snow bar structure. The secure locking is guaranteed by the self-locking design of the dual-controlled handle.

Release of the clamping mechanism is achieved by resetting the mode dial 5 in the open direction and then retracting the control dial 4 in the closing direction.

In order to open the mode change dial 5 in the open direction, the lifting pins 20 extending into the operating area of the ratchet position the ratchet control levers 17 in an elevated position, thereby increasing the lifting springs 18 between the ratchet levers 15 engaging under load and the raised ratchet control levers 17. For a slight retraction of the control dial 4, the release levers 15 are retracted by the lifting springs 18 with a click sound, thereby releasing the handle to the unlocked position by unlocking the lever assembly in the open direction.

Claims (7)

PATENT CLAIMS 1. A central clamping mechanism for snowmobiles for vehicle wheels, which is coupled to each other in a pair of gears fixed to a common shaft in the hub part of the clamping mechanism, so as to move in opposite directions with a rack characterized in that the other (outer) end of the clamping spring (13) connected to the shaft (12) of the gears (11) is fixed to the control disk (4) and the control disk (4) engages the hub part (6) of the clamping device. Clamping device according to Claim 1, characterized in that the hub part (6) of the clamping device has a latching cup (7) fitting to the operating disc (4), in which a coaxial recess (8) is provided for receiving the handle and clamping spring (13). a handle wheel gear is formed on the side of the control dial (4) and on the periphery of the coaxial recess (8). Clamping device according to claim 2, characterized in that the ratchet gear is formed on a separate ratchet insert (14) fixed to the periphery of the coaxial recess (8). 4. Clamping device according to any one of Claims 1 to 3, characterized in that the clamping mechanism comprises a handle (15) pivotally mounted on the operating disc (4), pins (19) for engaging the handle ends (16) and pivoting pivots (15). pre-tensioned lifting springs (18) are arranged between the handle arms (17) and the handle arms (15) and the handle arms (17). 5. Clamping device according to one of Claims 1 to 4, characterized in that it is provided with a mode change dial (5) which is pivotable between two arrested end positions and is thus capable of releasing or activating the handle. Clamping device according to Claim 5, characterized in that the pins (20), which rotate with the control dial (4) but can be rotated relative to the control dial (4) between two locked end positions, extend into the operating area of the ratchet. HU 210 372 Β 7. Clamping device according to one of Claims 1 to 3, characterized in that the operating disc (4) is provided with stop bumps (23), a cam disc (21) with stop cams (22) mounted on the spindle (12) of the gears (11), a clamping spring for transmitting torque 5. And (13) is biased between the shaft (12) of the gears (11) and the dial (4) by resting the stop cams (22) on the stop pins (23).