FR2597385A1 - Tool for compressing helical automobile suspension springs of the "MacPherson" type - Google Patents

Abstract

The invention relates to a method making it possible to compress a helical damper spring in a very short time, without effort and with an optimum degree of safety. The tool consists of a notched sole-plate 1 with a rotating base, of a channel 2 for holding the damper 3, and of two square orifices 4 for receiving the lower hooks 5 of the compressing assemblies. The compressing assemblies are each formed of a forged hook 6 which can be adjusted by telescopic positioning and locked by a bolt 7, and this hook is securely fastened to an articulation 8 itself provided with a square tube 9 into which the lever arm 10 is introduced. When the user exerts traction on the lever arms 10 to bring them into a parallel position, the hooks 6 descend, compressing the spring; four holes 11 are then aligned and receive safety pins 12. The tool is intended for compressing helical automobile suspension springs of the "MacPherson" type.

Description

 The present invention relates to a tool for compressing the helical springs of automobile suspension shock absorbers "Mac Pherson type".

 The compression of the springs is traditionally carried out using tools operating slowly and requiring the use of a crank, socket wrench or ratchet and requiring maintenance such as lubrication.

 The method according to the invention makes it possible to remedy these drawbacks. The tool is made up of three mechanical assemblies; two articulated compressor assemblies coming to be fixed on the support support assembly.

 The support support assembly is in fact a U-shaped sole, indented on its largest surface to allow the passage of the damper body; provided with a holding chute lockable by a zipper and a rotating base intended to be gripped in the jaws of a vice thus allowing the tool to be able to make a U-turn on itself.

 The lateral wings of the sole are each provided with a square orifice receiving the lower hook of the compressor assemblies.

 The compressor assemblies each include a hinged lower hook and an upper hook adjustable in length by telescopic positioning and locking by bolt acting as a pin. The upper hook is secured to a hinge itself provided with a square tube serving to receive a lever arm of the same shape but of lower lateral dimension.

 When the user exerts a traction on the lever arms, the latter after having described a circular movement are at the end of the race in parallel position generating during this race a multiplication of force and a transformation of movement into a rectilinear traction on the hooks superiors who caught on an upper turn of the spring force the latter to compress.

 As a safety measure to prevent the compressor assemblies from opening, two ball pins are introduced into the joint, passing right through it; It is only after this last precaution that the lever arms are removed from the tool.

 All the parts making up the tool are made of steel.

The accompanying drawings illustrate the invention;
Figure I shows the tool according to the invention.

 2 shows the sole (1) provided with the openings (4) of the chute (2) in the closed position, of the rotating base (13) of square section 30 x 30 mm pivoting around an axis (14) through which a lug (15).

 The axis (14) is welded to a plate (16), the latter is itself welded to the sole (1). The length of the axle (15) is 2 mm less than the width of the rotating base (13) to allow the user to lift the base (1) when the rotating base (13) is trapped in the vice (21).

 Figure 3 shows the sole seen from dess ls.

Figure 4 shows the sole (1) provided with its chute in the open position, the latter consists of two half-tubes with an internal diameter of 70 mm, -a fixed lower with a length of 180 mm welded on the sole (1), the other upper
mobile with a length of 60 mm articulated by a tube (19) sliding and pivoting on an axis - (17) 180 mm long and welded to the lower half-tube. The rotating base (13) is
seized in the vice (21).

Figure 5 shows the sole (1) seen from above open chute. The half-tube
lower is provided with a locking lug (18).

 When the user closes the chute, the tube (20) comes in front of the locking lug (18), it then suffices to move the upper half-tube backwards to lock.

Figure 6 shows a compressor assembly. The upper hook 6 is welded into a square tube (22) of 25 x 25 mm provided with holes of 8 mm in diameter. The tube (23) of 30 x 30 mm is provided with a hole diameter 8 mm to allow adjustment
telescopic and blocking the tube (22) in the tube (23) by a bolt.

 The pieces (24) and (25) are shaped in a 5 x 30 mm dish. They are hinged together in (8). They are drilled with an 8 mm diameter hole located 95 mm from the joint (8). The tube (9) receiving the lever arm is welded between the two plates (25) its dimension is 30 x 30 mm. The hook (5) is welded into a 30 x 30 x 30 mm tube pierced and traversed by a rivet trapping it between the two plates (25); the riveting being slippery, the hook (5) is therefore articulated.

 FIG. 7 represents a compressor assembly from the front.

 The tube (23) is articulated by sliding rivet between two spacers (26) 5 mm thick welded on the internal part of the plates (24).

 FIG. 8 represents the tool provided with two lever arms (10) in 25 x 25 mm tube with a minimum length of 500 mm, two safety pins (12) in place of S mm in diameter and 70 mm long. The damper body (3) is held in the chute (2) the spring (27) seen in section is compressed.

 FIG. 9 represents a different mode of use of the tool.

 The sole is missing but the compressor assemblies can be used differently while fulfilling the same functions. The shock absorber (3) is gripped with the vice, the lower hooks (5) are slid first under the lowest turn and the adjustable hooks (6) on the highest turn.

 The user introduces the lever arms (10) and actuates the tool. After the safety maneuvers, the spring can be extracted while remaining compressed with the compressor assemblies on it.

 The tool according to the invention is intended to compress the helical springs of "Mac Pherson Type" automobile suspension shock absorbers.

Claims (7)

 I) Tools for compressing the helical springs of automobile suspension shock absorbers "Mac Pherson type" characterized in that it comprises a sole (1) with a rotating base (13); a lockable cylindrical chute (2) for holding the shock absorber and two identical compressor assemblies actuated by lever arm (lu).  2) Tool according to claim I characterized in that the rotating base (13) is part of the sole (I).  3) Tool according to claims I and 2 characterized in that the chute (2) cylindrical damper holding is lockable by slide (17) and lug (18) and is an integral part of the sole (I).  4) Tool according to claims I - 2 and 3 characterized in that the compression assemblies are identical and each comprise a hook (o) forged and welded in a tube (22) pierced with a series of holes, sliding in a tube larger (23) drilled with a hole thus providing a telescopic adjustment and a blocking through bolt.  5) Tool according to claim 4 characterized in that the compression assemblies are composed of a movement transformation system and force reduction established by the assembly of parts (24) (25) and (9) articulated in (8) ) and actuated by two lever arms (10) with a minimum length of 500 mm.  6) Tool according to claims 4 and 5 characterized in that the compression assemblies are provided with a lower hook (5) articulated offering the tool two modes of use;  7) Tool according to any one of the preceding claims, characterized in that it is made of steel.