Patent EP0245221A2 successfully refreshed from Google Patents.
EP0245221A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Motorcycle's fork
Assignee: SPECIAL FORKS Srl
•
Filing: 1987-04-29
•
Granted: —
•
Expires: 2007-04-29
Abstract
Abstract Described is a front, fork type, suspension for motorcycles utilizing a single, centrally mounted, shock absorber between the head crown and an arched bracket joining the two stress tubes slideable inside two cylinders mounted in the relative clamps of the head crown and of the base crown. The new fork offers a number of advantages in respect of the forks of the prior art; an increased rigidity and resistance to flection, coupled to a reduction of the mobile weights of the suspension are only some of the advantages.
Inventors
- 👤 Enrico Ceriani
- 👤 Marco Ceriani
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 09:15
CPC Classifications
B; B62; B62K; B62K21/00; B62K21/02; B60; B60G; B60G17/00; B60G17/02; B60G17/021; B62K25/00; B62K25/04; B62K25/06; B62K25/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
178 words
A motorcycle's fork comprising a head steering crown and a base steering crown mounted, respectively, on the top and bottom ends of a steering pin, and which provide two pairs of coaxial clamps for clamping, respectively, two telescopic members forming the fork, at the lower end of which means are provided for anchoring the axle of the front wheel, and further comprising means for damping excursions of said telescopic members, characterized by comprising: a) a single shock absorber, mounted frontally and essentially centrally between said head crown and a bracket joining two stress tubes of said two telescopic members; b) two tubolar members, mounted, respectively, in said two pairs of coaxial clamps of the head crown and of the base crown, constituting two slide cylinders of said two stress tubes; the top end of said stress tubes, constituting a reaction point to flexural stresses acting in correspondence of said front wheel's axle, sliding inside the relative tubolar members between two limit positions both contained between the head crown's clamp and the base crown's clamp of said coaxial pairs.
Claim 2
Dependent Claim
178 words
A motorcycle's fork comprising a head steering crown and a base steering crown mounted, respectively, on the top and bottom ends of a steering pin, and which provide two pairs of coaxial clamps for clamping, respectively, two telescopic members forming the fork, at the lower end of which means are provided for anchoring the axle of the front wheel, and further comprising means for damping excursions of said telescopic members, characterized by comprising: a) a single shock absorber, mounted frontally and essentially centrally between said head crown and a bracket joining two stress tubes of said two telescopic members; b) two tubolar members, mounted, respectively, in said two pairs of coaxial clamps of the head crown and of the base crown, constituting two slide cylinders of said two stress tubes; the top end of said stress tubes, constituting a reaction point to flexural stresses acting in correspondence of said front wheel's axle, sliding inside the relative tubolar members between two limit positions both contained between the head crown's clamp and the base crown's clamp of said coaxial pairs.
Claim 3
Dependent Claim
29 words
The motorcycle's fork according to claim 1, wherein the elevation position of said clamps of the base crown is substantially Lower than the Lowermost portion of said steering pin.
Claim 4
Dependent Claim
28 words
The motorcycle's fork according to claim 1, wherein said slide tubolar members of said stress tubes extend by a certain distance from said clamps of the base crown.
Claim 5
Dependent Claim
44 words
The motorcycle's fork according to claim 1,-wherein said bracket has an arched shape and each of its extremities is connected to the respective stress tube at a substantiaLLy intermediate position between said front wheel's axle and the Lower end of said slide tubolar members.
Claim 6
Dependent Claim
79 words
The motorcycle's fork according to claim 1, wherein said shock absorber is provided with a single primary spring and with relative pre-Loading rings for adjusting the LongitudinaL static trim of the motorcycle and wherein in the upper portion of both said tubolar members, is housed a spring, said two springs being engaged and compressed by the top end of said stress tubes upon approaching their maximum stroke distance inside said tubolar members during the compression phase of the suspension.
Claim 7
Dependent Claim
39 words
The motorcycle's fork according to claim 5, wherein said springs housed in the upper portion of said tubolar members are easily replaceable, calibrated, springs for correcting the elastic characteristic of the suspension in proximity of the end of stroke.
Claim 8
Dependent Claim
26 words
The motorcycle's fork according to claim 1, wherein antifriction metal inserts are solidly fixed over slide surfaces of said stress tubes and of said slide cylinders.
Claim 9
Dependent Claim
22 words
The motorcycle's fork according to claim 7, wherein means are provided for containing and distributing lubricating oil inside said tubolar slide members.
Claim 10
Dependent Claim
30 words
The motorcycle's fork of claim 1, wherein the anchoring position of said single shock absorber on said head crown is adjustable for changing the longitudinal static trim of the motorcycle.
Claim 11
Dependent Claim
31 words
The motorcycle's fork of claim 9, wherein said adjustment of the anchoring position is implemented by inserting a Seeger's ring for exteriors in one or another of a number of seats.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.