Tilt cab truck with anti-dive and anti-sway control
First Claim
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1. A tilt-cab truck comprising:
- (a) a chassis;
(b) a cab mounted on said chassis and pivotable with respect to said chassis about an axis;
(c) a roll-angle sensing device;
(d) a shock absorber assembly disposed between said chassis or said cab, said shock absorber assembly comprising;
(i) a shock absorber cylinder mounted on one of said chassis and said cab;
(ii) a shock absorber rod mounted on the other of said chassis and said cab;
(iii) a shock absorber piston carried by said shock absorber cylinder;
(iv) a reservoir for shock absorber fluid;
(v) a first path of fluid communication connecting said reservoir to the interior of said shock absorber cylinder on the downstroke side of the normal position of said shock absorber cylinder, said first path of fluid communication containing a one-way valve which permits flow to said shock absorber cylinder but prevents flow to said reservoir;
(vi) a second path of fluid communication connecting said reservoir to the interior of said shock absorber cylinder on the downstroke side of the normal position of said shock absorber cylinder, said second path of fluid communication containing a fluid flow restrictor which permits restricted flow in either direction; and
(vii) a third path of fluid communication connecting said reservoir to said shock absorber cylinder on the upstroke side of the normal position of said shock absorber piston, said that path of fluid communication containing a valve which in a first position permits flow in either direction and in a second position prevents flow in both directions, wherein said valve in said third path of fluid communication is operatively connected to said roll-angle sensing device such that said valve is placed in its first position when said roll-angle sensing device senses a roll angle less than a predetermined value and is placed in its second position when said roll-angle sensing device senses a roll angle greater than the predetermined value.
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Accused Products
Abstract
Disclosed is a tilt cab truck having a shock absorber assembly in which a path of fluid communication between the fluid reservoir and the interior of the shock absorber assembly is automatically blocked both when the brake is applied and when a roll-angle sensing device senses a roll angle greater than a predetermined value, thereby strengthening the shock absorbing function. Two embodiments of the invention are disclosed.
31 Citations
36 Claims
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1. A tilt-cab truck comprising:
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(a) a chassis; (b) a cab mounted on said chassis and pivotable with respect to said chassis about an axis; (c) a roll-angle sensing device; (d) a shock absorber assembly disposed between said chassis or said cab, said shock absorber assembly comprising; (i) a shock absorber cylinder mounted on one of said chassis and said cab; (ii) a shock absorber rod mounted on the other of said chassis and said cab; (iii) a shock absorber piston carried by said shock absorber cylinder; (iv) a reservoir for shock absorber fluid; (v) a first path of fluid communication connecting said reservoir to the interior of said shock absorber cylinder on the downstroke side of the normal position of said shock absorber cylinder, said first path of fluid communication containing a one-way valve which permits flow to said shock absorber cylinder but prevents flow to said reservoir; (vi) a second path of fluid communication connecting said reservoir to the interior of said shock absorber cylinder on the downstroke side of the normal position of said shock absorber cylinder, said second path of fluid communication containing a fluid flow restrictor which permits restricted flow in either direction; and (vii) a third path of fluid communication connecting said reservoir to said shock absorber cylinder on the upstroke side of the normal position of said shock absorber piston, said that path of fluid communication containing a valve which in a first position permits flow in either direction and in a second position prevents flow in both directions, wherein said valve in said third path of fluid communication is operatively connected to said roll-angle sensing device such that said valve is placed in its first position when said roll-angle sensing device senses a roll angle less than a predetermined value and is placed in its second position when said roll-angle sensing device senses a roll angle greater than the predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A shock absorber assembly comprising:
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(a) a shock absorber cylinder; (b) a shock absorber rod; (c) a shock absorber piston carried by said shock absorber rod and slidably received in said shock absorber cylinder; (d) a reservoir for shock absorber fluid; (e) a roll-angle sensing device; (f) a first path of fluid communication connecting said reservoir to the interior of said shock absorber cylinder on the downstroke side of the normal position of said shock absorber piston, said first path of fluid communication containing a one-way valve which permits flow to said shock absorber cylinder but prevents flow to said reservoir; (g) a second path of fluid communication connecting said reservoir to the interior of said shock absorber cylinder on the downstroke side of the normal position of said shock absorber cylinder, said second path of fluid communication containing a fluid flow restrictor which permits restricted flow in either direction; and (h) a third path of fluid communication connecting said reservoir to said shock absorber cylinder on the upstroke side of the normal position of said shock absorber piston, said third path of fluid communication containing a valve which in a first position permits flow in either direction and in a second position prevents flow in both directions, wherein said valve in said third path of fluid communication is adapted to be operatively connected to a roll-angle sensing device such that said valve is placed in its first position when the roll-angle sensing device senses a roll angle less than a predetermined value and is placed in its second position when the roll-angle sensing device senses a roll angle greater than the predetermined value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A tilt-cab truck comprising:
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(a) a chassis; (b) a cab mounted on said chassis and pivotable with respect to said chassis about an axis; (c) a roll-angle sensing device; (d) a shock absorber assembly disposed between said chassis or said cab, said shock absorber assembly comprising; (i) a shock absorber cylinder mounted on one of said chassis and said cab; (ii) a shock absorber rod mounted on the other of said chassis and said cab; (iii) a shock absorber piston carried by said shock absorber cylinder; (iv) a reservoir for shock absorber fluid; (v) a first path of fluid communication connecting said reservoir to the interior of said shock absorber cylinder on the downstroke side of the normal position of said shock absorber piston, said first path of fluid communication containing a one-way valve which permits flow to said shock absorber cylinder but which prevents flow to said reservoir; (vi) a second path of fluid communication connecting the interior of said shock absorber cylinder on the downstroke side of the normal position of said shock absorber piston to the interior of said shock absorber cylinder on the upstroke side of the normal position of said shock absorber piston, said second path of fluid communication containing in series a fluid flow restrictor which permits restricted flow in either direction and a one-way valve which permits flow to the upstroke side of the normal position of said shock absorber piston but which prevents flow to the downstroke side of the normal position of said shock absorber piston; and (vii) a third path of fluid communication connecting said reservoir to said shock absorber cylinder on the downstroke side of the normal position of said shock absorver piston, said third path of fluid communication containing a valve which in a first position permits flow in either direction and in a second position prevents flow in both directions, wherein said valve in said third path of fluid communication is operatively connected to said roll-angle sensing device such that said valve is placed in its first position when said roll-angle sensing device senses a roll angle less than a predetermined value and is placed in its second position when said roll-angle sensing device senses a roll angle greater than the predetermined value. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A shock absorber assembly comprising:
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(a) a shock absorber cylinder; (b) a shock absorber rod; (c) a shock absorber piston carried by said shock absorber rod and slidably received in said shock absorber cylinder; (d) a roll-angle sensing device; (e) a reservoir for shock absorber fluid; (f) a first path of fluid communication connecting said reservoir to the interior of said shock absorber cylinder on the downstroke side of the normal position of said shock absorber piston, said first path of fluid communication containing a one-way valve which permits flow to said shock absorber cylinder but which prevents flow to said reservoir; (g) a second path of fluid communication connecting the interior of said shock absorber cylinder on the downstroke side of the normal position of said shock absorber piston to the interior of said shock absorber cylinder on the upstroke side of the normal position of said shock absorber piston, said second path of fluid communication containing in series a fluid flow restrictor which permits restricted flow in either direction and a one-way valve which permits flow to the upstroke side of the normal position of said shock absorber piston but which prevents flow to the downstroke side of the normal position of said shock absorber piston; and (h) a third path of fluid communication connecting said reservoir to said shock absorber cylinder on the downstroke side of the normal position of said shock absorber piston, said third path of fluid communication containing a valve which in a first position permits flow in either direction and in a second position prevents flow in both directions, wherein said valve in said third path of fluid communication is adapted to be operatively connected to a roll-angle sensing device such that said valve is placed in its first position when the roll-angle sensing device senses a roll angle less than a predetermined value and is placed in its second position when the roll-angle sensing device senses a roll angle greater than the predetermined value. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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Specification