SUSPENSION ADJUSTMENT ASSEMBLY

Abstract

A shock absorber adjuster assembly comprising at least one spring arranged so as, in use, to extend between a pair of spaced apart spring seats. At least one of the spring seats is adjustable and is formed by a cylindrical body, a first adjustable member and a second adjustable member. The body has a first thread formed on its outer surface and a second thread formed on its inner surface. The first adjustable member includes a first flange having a threaded inner surface which is engageable with the first thread of the body so that the first flange can be screwed along the first thread. The second adjustable member includes a second flange provided on an end of a shaft. The separation between the first and second flanges can thereby be adjusted by moving of either or both of said first and second flanges.

Claims

1-12. (canceled)

13. An adjustable spring seat for a shock absorber comprising: a cylindrical body having an end and a first thread formed on its outer surface and a second thread formed on its inner surface; a first adjustable member including a first flange having a threaded inner surface which is engageable with the first thread of the cylindrical body so that the first flange can be screwed along the first thread so as to adjust the longitudinal position of the first flange on the cylindrical body; and a second adjustable member including a shaft having an end and a second flange disposed on the end of the shaft, the shaft further having an outside surface and a thread formed on said outside surface complementary to the second thread of the cylindrical body, wherein the shaft is engageable with the second thread through the end of the cylindrical body and can be screwed along the second thread so as to adjust the longitudinal space between the second flange and the end of the cylindrical body, wherein said first and second flanges being moveable independently of each other, whereby the separation between the first and second flanges can be adjusted by moving of either or both of said first and second flanges.

14. The adjustable spring seat according to claim 13, wherein the cylindrical body includes engaging means for applying a torsional force to the cylindrical body either to rotate it to effect simultaneous adjustment of both the first and the second adjustable members, or in order to hold it against rotation during adjustment of either or both of said first and second adjustable members.

15. The adjustable spring seat of claim 14, wherein the cylindrical body includes radial openings in its outer surface adapted to receive engageable teeth of a restraining tool so as to apply a torque to the cylindrical body.

16. The adjustable spring seat of claim 15, wherein the radial openings are distributed at least partially around a circumference of the cylindrical body.

17. The adjustable spring seat of claim 15, wherein a set of radial openings are provided at more than one position along a length of the cylindrical body so as to enable the tool to engage a set of radial openings even if one set is obscured by the first adjustable member.

18. The adjustable spring seat of claim 15, further comprising a third flange disposed on the outer surface of the cylindrical body, wherein the radial openings are formed in the third flange.

19. The adjustable spring seat of claim 18, wherein the third flange is rotationally fast with the cylindrical body.

20. The adjustable spring seat of claim 19, wherein the third flange is integrally formed with the cylindrical body.

21. The adjustable spring seat of claim 15, wherein the radial openings are formed as circumferentially extending slots.

22. The adjustable spring seat of claim 13, wherein the first and second threads are of opposite hand such that the first and second flanges may be simultaneously moved away from each other by rotating the cylindrical body in a one direction, and moved towards each other by rotating the cylindrical body in the other direction.

23. The adjustable spring seat of claim 13, further including stop means associated with each adjustable member to enable it to be locked in position against unintentional longitudinal movement.

24. The adjustable spring seat of claim 13, wherein the outer dimension of the cylindrical body is adapted to be a close tolerance fit inside the spring with which the spring seat engages to minimize lateral movement of the spring on the seat.

25. A shock absorber adjuster assembly comprising: at least one spring partially compressed between a pair of spaced apart spring seats, wherein at least one of the spring seats comprises the adjustable spring seat of claim 13.

26. The shock absorber adjuster assembly according to claim 25, wherein said adjustable spring seat engages with an end of the spring which is located upper most in the shock absorber assembly.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order that the invention may be well understood, there will now be described an embodiment thereof, given by way of example, reference being made to the accompanying drawings, in which:

[0018] FIG. 1 is an adjustable spring seat according to the prior art;

[0019] FIG. 2 is an adjustable spring seat according to an embodiment of the invention;

[0020] FIGS. 3a to 3c are various views of the main body of the adjustable spring seat of FIG. 2;

[0021] FIGS. 4a to 4c are various views of the first adjustable member of the adjustable spring seat of FIG. 2;

[0022] FIGS. 5a and 5b are various views of the second adjustable member of the adjustable spring seat of FIG. 2;

[0023] FIG. 6 is a side view of an adjusting tool engaging with the adjustable spring seat of FIG. 2; and

[0024] FIG. 7 is the assemble adjustable spring seat according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0025] Referring first to FIG. 1, there is shown an example of applicant's own earlier prior art arrangement. A pair of springs 2, 3 are arrange in series between a pair of spring seats 4, 5, the upper spring seat 4 of which is adjustable.

[0026] The upper spring seat 4 is formed by an upper flange 6 having a shaft 4b extending therefrom into the windings of the abutting end 2a of the spring 2 so as to retain it in position. The upper flange, in use, engages against a part of the vehicle suspension to transmit the force from the suspension strut and spring to the vehicle. The outer surface 4a of the shaft 4b of the upper spring seat 4 is threaded and has a flange member 7 against which the upper end 2a of the spring 2 engages. The flange member 7 is threadably mounted on the outer surface 4a of the shaft so as to be longitudinally moveable along the shaft 4b by winding along the thread. In this way, the compression of the spring can be adjusted.

[0027] Referring now to FIG. 2, there is shown an adjustable suspension spring seat according to the present invention. As with the prior art arrangement of FIG. 1, the spring seat is formed a main body 14 having a shaft 14b which, in use, extends into the windings of the abutting end of the spring so as to retain the spring in position on the shaft. The shaft 14b of the main body 14 has a radial flange 14c formed on one end thereof and outer surface 14a of the shaft 14b, extending away from the radial flange, has a male thread 15a provided thereon on which is carried a first adjustable member in the form of an adjustable flange member 17.

[0028] More particularly, as shown in FIGS. 4a-4c, the adjustable flange member 17 is annular shaped and has a female thread 18 provided on its inner cylindrical surface 17a which is complementary to the thread 15a formed on the outer surface 14a of the shaft The flange member 17 is thereby threadably mounted on the outer surface 14a of the shaft 14b so as to be longitudinally moveable along the shaft 14b between a fully retracted position in which it engages against the radial flange 14c of the main body 14 and a fully extended position in which it is wound to the bottom of the thread 15a as shown in FIG. 2. This accordingly provides a first range of adjustment for the compression of a spring against in which the shaft 14b is engaged in a similar manner to the prior art arrangement described above.

[0029] The main body 14 furthermore has a female thread 15b formed on its inner cylindrical surface extending from the end on which the radial flange 14c is carried.

[0030] A second adjustable member 19, shown in FIGS. 5a and 5b, comprises a flange 19b with a shaft 19a extending therefrom having a male thread 19c formed on its outer cylindrical surface which is complementary to the female thread 15b formed on the inner cylindrical surface of the main body 14 such that the shaft 19a of the second adjustable member 19 is screwingly engageable into the main body 14 in order to secure it thereto, the separation between the flange 19b of the second adjustable member 19 and the radial flange 14c of the main body 14 being adjustable by screwing the second adjustable member 19 into and out of the main body 14.

[0031] The main body 14 includes circumferentially extending slots 20 in the outer circumferential face of the radial flange 14c, as shown in FIGS. 2 and 6, the slots 20 being distributed around the circumference of the flange 14c. An adjusting tool 21 includes teeth 22 thereon which are engageable in the slots 20 in order to enable a torsional load to be applied through the tool 21 to the main body 14.

[0032] The adjustable spring seat is assembled with the first adjustable member 17 wound fully onto the thread 15a on the outer surface 14a of the main body 14 so as to abut against on side of the radial flange 14c of the main body, and the second adjustable member 19 wound fully into the female thread 15b formed on the inner surface of the main body 14. The face of the flange 19b of the second adjustable member 19 is engaged against a suspension mounting point in a manner known in the art and an end of a suspension spring is engaged over the protruding end of the threaded shaft 14b of the main body 14.

[0033] In the preferred embodiment, the male thread 15a is of opposite hand to the female thread 15b, and the length of the male thread is substantially equal to the length of the female thread so that the adjustment range of each is the same. In order, then, to adjust the preload on the spring, the teeth 22 of the adjustment tool 21 are engaged in slots 20 in the radial flange 14c and the main body 14 is rotated, the load on the first and second adjustable members from the suspension engagement point and the spring preventing rotation so that the two adjustment members 17, 19 are extended away from each other, compressing the spring. The body 14 may be rotated in the opposite direction in order to retract the adjustable members towards each other and thereby reduce the load on the spring.

[0034] Alternatively, the tool 21 may be used to restrain the main body 14 from rotation whilst one or both of the adjustable members 17, 19 are rotated in order to adjust the load on the spring.

[0035] Although the invention has been described with the two threads 51 a, 15b of the main body being of opposite hand, they may instead be of the same hand with adjustment only being made by rotating the adjustable members 17, 19.