Bicycle fork having lock-out, blow-off, and adjustable blow-off threshold

• US 8,727,366 B2
• Filed: 05/20/2013
• Issued: 05/20/2014
• Est. Priority Date: 07/02/2001
• Status: Active Grant

• Current Assignee: Fox Factory Incorporated
• Original Assignee: Fox Factory Incorporated
• Inventors: Becker, William M., Lampman, Brian
• Primary Examiner(s): TO, TOAN C
• Application Number:
  US13/898,396
• Publication Number:
  US 20130249181A1
• Time in Patent Office: 365 Days
• Field of Search: 280/276, 280/279, 188/281, 188/285, 188/297, 188/313, 188/314, 188/316, 188/317, 188/282.1, 188/282.8, 188/282.9
• US Class Current: 280/276
• CPC Class Codes: B60G 17/08 Characteristics of fluid dampers adjusting fluid dampers in general F16F9/44 - F16F9/53
• CPC Class Codes: B62K 2025/047 with suspension locking means
• CPC Class Codes: B62K 2025/048 with suspension manual adjustment details
• CPC Class Codes: B62K 25/06 with telescopic fork, e.g. including auxiliary rocking arms
• CPC Class Codes: B62K 25/08 for front wheel
• CPC Class Codes: B62K 25/286 the shock absorber being connected to the chain-stay via a linkage mechanism
• CPC Class Codes: F16F 13/007 the damper being a fluid damper
• CPC Class Codes: F16F 9/064 Units characterised by the location or shape of the expansion chamber F16F9/068, F16F9/08 take precedence
• CPC Class Codes: F16F 9/3221 of piston rods
• CPC Class Codes: F16F 9/34 Special valve constructions F16F9/44, F16F9/50 take precedence; filtering details F16F9/3285 ; valves in general F16K; Shape or construction of throttling passages
• CPC Class Codes: F16F 9/44 Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction F16F9/53, F16F13/26 take precedence; temperature correction only F16F9/52
• CPC Class Codes: F16F 9/56 Means for adjusting the length of, or for locking, the spring or damper, e.g. at the end of the stroke F16F9/50 takes precedence; for telescopic gas springs or dampers F16F9/0245; vehicle suspension locking arrangements B60G17/005

Abstract

A bicycle fork includes a pair of fork leg assemblies, each of the leg assemblies having an upper leg telescopingly engaged with a lower leg. A damping assembly is provided in at least one of the legs. The damping assembly includes lock-out and blow-off compression circuits. These compression circuits are externally adjustable without tools. Furthermore, these two compression circuits may be adjusted independently of each other.

Claims

1. A vehicle suspension, comprising:

a first member;

a second member;

a lock-out valve of said first member, said lock-out valve having at least two positions, one position of said lock-out valve at least substantially inhibiting said first and second members from moving closer together when subjected to a compressive force less than an adjustable threshold pressure;

a blow-off valve of said second member allowing said first and second members to move closer together in response to a pressure imparted on the blow-off valve during compression of said first and second members being equal to or greater than said adjustable threshold pressure when said lock-out valve is in its substantially inhibiting movement position;

a first external adjuster permitting adjustment of said lock-out valve from a location external of said vehicle suspension;

a damping fluid chamber comprising a compression chamber and a rebound chamber separated by a piston, said damping fluid chamber positioned at least partially in said second member;

at least one adjustable damping mechanism positioned in said first member; and

a flow channel configured for enabling a fluid to flow there through, said flow channel positioned in said first and second members and enabling said flow of said fluid through said damping fluid chamber, said at least one adjustable damping mechanism and a reservoir coupled with said compression chamber and said at least one adjustable damping mechanism, wherein said at least one adjustable damping mechanism selectively blocks said fluid flowing through said flow channel, thereby selectively affecting movement of said piston.

2. The vehicle suspension of claim 1, further including a second external adjuster permitting adjustment selection of positions of said blow-off valve from a second location external of said vehicle suspension.

3. The vehicle suspension of claim 1 wherein said first and second members are telescopically engagable tubes.

4. The vehicle suspension of claim 1, wherein said at least one adjustable damping mechanism comprises:

at least one shim.

5. The vehicle suspension of claim 1, wherein said at least one adjustable damping mechanism is part of a damper cap assembly.

6. The vehicle suspension of claim 1, further comprising:

an adjustable damping mechanism receiver configured to receive varying thicknesses of said at least one adjustable damping mechanism.

7. A vehicle suspension, comprising:

a first member;

a second member;

a lock-out valve of said first member, said lock-out valve having at least two lock-out positions, a first position wherein said first and second members may move closer together and a second position where said first and second members are inhibited from moving closer together;

a blow-off valve of said second member operable when said lock-out valve is in said first position, said blow-off valve allowing said first and second members to move closer together in response to a pressure imparted during compression of said first and second members, said pressure equal to or greater than an adjustable threshold pressure;

a first external adjuster, the first external adjuster permitting adjustment of at least one of said at least two lock-out positions and said adjustable threshold pressure;

a rebound damping circuit positioned at least partially within said first and second members, said rebound damping circuit comprising;

a cartridge tube comprising;

a damping fluid chamber comprising;

a first compression chamber; and

a rebound chamber separated by a piston, wherein said damping fluid chamber comprises a lower compression passage there through, and wherein said second member and said cartridge tube define a reservoir there between; and

a shaft and rebound rod coupled with said piston, said shaft and rebound rod defining an upper compression passage positioned there between, said upper compression passage coupled to said lower compression passage; and

a damper cap assembly positioned in said first member, said damper cap assembly comprising;

a second compression chamber coupled with said upper compression passage; and

at least one adjustable damping mechanism, wherein said at least one adjustable damping mechanism determines movement of said piston, and wherein said first compression chamber, said first and second compression passages, and said reservoir cooperate to define a flow channel from said first compression chamber, through said piston, said shaft and said damper cap assembly to said reservoir.

8. The vehicle suspension of claim 7, wherein said at least one adjustable damping mechanism comprises:

at least one shim.

9. The vehicle suspension of claim 7, wherein said damper cap assembly further comprises:

an adjustable damping mechanism receiver configured to receive varying thicknesses of said at least one adjustable damping mechanism.