US3931989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Connecting device for front and rear frame of tricycle
Assignee: Daihatsu Motor Co Ltd
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Filing: 1974-06-10
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Granted: 1976-01-13
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Expires: 1994-06-10
Abstract
Abstract A tricycle having a front frame supported with one front wheel and a rear frame supported with two rear wheels, wherein the front frame is connected with the rear frame on the axis longitudinal of the tricycle in the relation that the front frame is capable of being inclined to one side or the other with respect to the rear frame. The tricycle is provided with a torsion bar arranged between the front frame and the rear frame on the axial line so that the torsion bar is subjected to only torsion not to complicated stresses of bending and tension.
Inventors
- 👤 Toshiaki Nagamitsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:15
CPC Classifications
B; B62; B62K; B62K5/00; B62K5/02; B62K5/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
194 words
A connecting device for a front and a rear frame of a tricycle wherein the front frame has a front wheel, a handle bar for steering said wheel and a saddle for a rider, and the rear frame has two rear wheels, said connecting device comprising a tubular shaft fixed to one of opposite ends of said front and rear frames; a boss member, of cylindrical shape, fixed to the other of said opposite ends; radial bearings insertably mounted within said boss member so as to hold said tubular shaft therewith, said tubular shaft, radial bearing and boss member similarly having an axis extending longitudinally of the tricycle body, said front frame being inclined around the axis to one side or the other enabling a rider to lean when a turn is made; and a torsion bar extending through said tubular shaft at the center thereof and positioned coincident with said axis, said torsion bar being insertably mounted between said front and rear frames so as to be fixed at the lengthwise fore end of the bar to the front frame and at the lengthwise rear end of the bar to the rear frame.
Claim 2
Dependent Claim
194 words
A connecting device for a front and a rear frame of a tricycle wherein the front frame has a front wheel, a handle bar for steering said wheel and a saddle for a rider, and the rear frame has two rear wheels, said connecting device comprising a tubular shaft fixed to one of opposite ends of said front and rear frames; a boss member, of cylindrical shape, fixed to the other of said opposite ends; radial bearings insertably mounted within said boss member so as to hold said tubular shaft therewith, said tubular shaft, radial bearing and boss member similarly having an axis extending longitudinally of the tricycle body, said front frame being inclined around the axis to one side or the other enabling a rider to lean when a turn is made; and a torsion bar extending through said tubular shaft at the center thereof and positioned coincident with said axis, said torsion bar being insertably mounted between said front and rear frames so as to be fixed at the lengthwise fore end of the bar to the front frame and at the lengthwise rear end of the bar to the rear frame.
Claim 3
Dependent Claim
35 words
The connecting device according to claim 1, wherein said tubular shaft is fixed to the rear end of the front frame and said boss member is fixed to the fore end of the rear frame.
Claim 4
Dependent Claim
35 words
The connecting device according to claim 1, wherein said tubular shaft is fixed to the fore end of the rear frame and said boss member is fixed to the rear end of the front frame.
Claim 5
Dependent Claim
45 words
The connecting device according to claim 1, wherein a fixing means for said torsion bar comprises a bracket member fixed to said frame and a fixing member non-rotatably mounted to one end of said torsion bar, said fixing member being fixed to said bracket member.
Claim 6
Dependent Claim
57 words
The connecting device according to claim 4, wherein said fixing member is rotatably supported by the bracket member through a supporting portion of the same and is provided with an adjusting arm extending similarly to the radial direction of said torsion bar so that the fixing member may be held in a non-rotatable state through said arm.
Claim 7
Dependent Claim
43 words
The connecting device according to claim 5, wherein said bracket member is secured with a pair of adjusting bolts in the transverse direction of the tricycle body, said bolts being engaged at each tip thereof with both sides of said adjusting arm respectively.
Claim 8
Dependent Claim
46 words
The connecting device according to claim 4, wherein said torsion bar is provided at the outer periphery of one end thereof with serrations in the lengthwise direction of the bar so that the bar may be non-rotatably mounted to the fixing member through a serration-connection therewith.
Claim 9
Dependent Claim
105 words
The connecting device according to claim 1, wherein said torsion bar is provided at the outer periphery of both ends thereof with male serrations in the lengthwise direction of the bar respectively and a bracket member is fixed to the front frame at the fore end side of the torsion bar, said bracket member having an internally serrated round opening forming female serrations, said torsion bar being fixed at the fore end thereof to the bracket member through engagement of said male serrations with said female serrations and being fixed at the rear end of the bar to the rear frame through a fixing means.
Claim 10
Dependent Claim
38 words
The connecting device according to claim 1, wherein said torsion bar is rectangularly bent at one end thereof so as to be fixed to said frame by means of a holder comprising a plate and a screw bolt.
Claim 11
Dependent Claim
58 words
The connecting device according to claim 1, wherein said torsion bar is rectangularly bent at at least one end thereof and said frame is secured with a pair of adjusting bolts in the transverse direction of the tricycle body, said bolts being engaged at each tip thereof with both sides of the bend end of the torsion bar.
Claim 12
Dependent Claim
44 words
The connecting device according to claim 10, wherein at the bent end of said torsion bar is attached a ball, and said adjusting bolts are formed at each tip thereof in a counter-hemisphere shape so that said tip may be engaged with said ball.
References Cited (Backward Citations)
US2221196A
Cited
DE1224164B
Cited
FR993029A
Cited
US2819093A
Cited
US2878032A
Cited
FR1471948A
Cited
US3504934A
Cited
US3698502A
Cited
US3583727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |