Claims
- 1. A swivel wheel assembly for mounting to a structure, comprising:
- a rotary member having a first throughhole which extends completely through said rotary member and a second throughhole which extends transversely to said first throughhole and completely through said rotary member;
- a resiliently flexible element integral with said rotary member and extending from and beyond one end of said first throughhole, said flexible element having a positioning key protruding substantially perpendicularly from said flexible element;
- a pivot pin having an annular groove formed at one end thereof, said pivot pin being positioned in said first throughhole with said positioning key of said flexible element received in said annular groove to secure said pivot pin relative to said rotary member, the other end of said pivot pin extending beyond other end of said first throughhole, wherein said pivot pin is rotatable relative to said rotary member and readily removable from said rotary member by flexing said flexible member away from said pivot pin to disengage said positioning key from said groove and pulling said pivot pin out of said first throughhole;
- a shaft positioned in said second throughhole of said rotary member;
- at least one wheel rotatably secured on said shaft; and
- means for mounting said pivot pin to said structure.
- 2. A swivel wheel assembly of claim 1, wherein said pivot pin is made of metal material and said rotary member is made of plastic material, whereby the overall swivel friction is reduced due to the difference in hardness between the contact surfaces of said pivot pin and said rotary member.
- 3. A swivel wheel assembly of claim 1, wherein said resiliently flexible element extends substantially parallel to said first throughhole.
- 4. A swivel wheel assembly of claim 1, wherein said resiliently flexible element engages only partially around the pivot pin at said groove.
- 5. A swivel wheel assembly of claim 1, wherein said structure is a tubular structure and said mounting means comprises a tube plug which attaches to said other end of said pivot pin for inserting into said tubular structure.
- 6. A swivel wheel assembly of claim 5, wherein said pivot pin is formed of metal, and said rotary member and said tube plug are formed of plastic materials softer than the metal.
- 7. In a swivel wheel assembly which uses a tube plug for attaching the assembly to a tubular structure, the improvement comprising:
- a rotary member having a first throughhole which extends completely through said rotary member and a second throughhole which extends transversely to said first throughhole and completely through said rotary member;
- a resiliently flexible element integral with said rotary member and extending from and beyond one end of said first throughhole, said flexible element having a positioning key protruding substantially perpendicularly from said flexible element;
- a pivot pin having an annular groove formed at one end thereof, said pivot pin being positioned in said first throughhole with said positioning key of said flexible element received in said annular groove to secure said pivot pin relative to said rotary member, the other end of said pivot pin extending beyond other end of said first throughhole for attaching said tube plug to mount said other end of said pivot pin to said tubular structure, wherein said pivot pin is rotatable relative to said rotary member and readily removable from said rotary member by flexing said flexible member away from said pivot pin to disengage said positioning key from said groove and pulling said pivot pin out of said first throughhole;
- a shaft positioned in said second throughhole of said rotary member; and
- at least one wheel rotatably secured on said shaft.
- 8. An improved swivel wheel assembly of claim 7, wherein said pivot pin is formed of metal, and said rotary member and said tube plug are formed of plastic materials softer than the metal.
- 9. An improved swivel wheel assembly of claim 7, wherein said resiliently flexible element extends substantially parallel to said first throughhole.
- 10. An improved swivel wheel assembly of claim 7, wherein said resiliently flexible element engages only partially around the pivot pin at said groove.
Parent Case Info
This is a continuation of application Ser. No. 07/840,712, filed Feb. 21, 1992, now abandoned.
US Referenced Citations (30)
Foreign Referenced Citations (8)
Number |
Date |
Country |
2107961 |
Aug 1972 |
DEX |
2404903 |
Aug 1975 |
DEX |
2532891 |
Feb 1977 |
DEX |
2638877 |
Mar 1977 |
DEX |
168064 |
Sep 1991 |
TWX |
3064 |
Jan 1889 |
GBX |
0861883 |
Mar 1961 |
GBX |
1533982 |
Nov 1978 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
840712 |
Feb 1992 |
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