Spring-biased mud flap hanger with improved pivoting motion guidance
Systems and methods for controlling movement of a mudflap hanger arm, to reliably return from a deflected position to a resting position, while providing improved manufacturability and reduced corrosion and wear through the use of guidance surfaces on a mounting plate and a frame seat that form the interface between the hanger arm and a vehicle frame. When the hanger arm pivots about an axis on one side of the mounting plate and frame seat, guidance surfaces on the opposite side are in contact or near-contact, preventing the mounting plate and frame seat from being laterally displaced or rotated with respect to each other. The improved mounting plate and frame seat can reduce or eliminate manufacturing operations such as welding, coating, etc., reducing the cost of the apparatus, while enhancing manufacturability and operation.
1. A mudflap hanger apparatus adapted to be mounted on a vehicle, the apparatus comprising:
a hanger arm assembly having a hanger arm and a mounting plate connected to a proximal end of the hanger arm, wherein the hanger arm comprises a tubular structure having a proximal opening;
a frame seat configured to movably engage the mounting plate; and
a spring coupled to the hanger arm assembly and the frame seat, wherein the spring biases the mounting plate toward a resting position against the frame seat;
wherein when a lateral force is applied to the hanger arm, the mounting plate variably pivots against the frame seat at one of a plurality of pivot axes, enabling the hanger arm to move angularly away from a resting position of the hanger arm;
wherein each of the mounting plate and the frame seat has one or more corresponding guidance surfaces, wherein the one or more guidance surfaces of the mounting plate oppose the one or more guidance surfaces of the frame seat, wherein a portion of the mounting plate extends into the hanger arm, wherein the portion of the mounting plate extending into the hanger arm includes at least a portion of the one or more guidance surfaces of the mounting plate; and
wherein when the mounting plate pivots against the frame seat at the one of a plurality of pivot axes, the one or more guidance surfaces of the mounting plate and the one or more guidance surfaces of the frame seat cause the mounting plate to move along a corresponding guided pivot path.
2. The mudflap hanger apparatus of claim 1 , wherein the hanger arm surrounds and supports the portion of the mounting plate extending into the hanger arm.
3. The mudflap hanger apparatus of claim 1 , wherein in the resting position at least a portion of the one or more guidance surfaces of the frame seat extend into the hanger arm.
4. The mudflap hanger apparatus of claim 1 , wherein in the resting position, a first resting surface of the mounting plate is fully seated against a second resting surface of the frame seat and the hanger arm extends distally from the frame seat in a longitudinal direction.
5. The mudflap hanger apparatus of claim 4 , wherein the first resting surface of the mounting plate and the second resting surface of the frame seat comprise substantially planar surfaces.
6. The mudflap hanger apparatus of claim 4 , wherein each of the first resting surface and the second resting surface includes a planar portion, wherein one of the first resting surface and the second resting surface includes a protrusion on a lower end of the resting surface and the other of the first resting surface and the second resting surface includes a recess which is complementary to the protrusion, and wherein the mounting plate is configured to pivot about the protrusion while the protrusion remains seated within the recess.
7. The mudflap hanger apparatus of claim 1 , wherein for one or more of the plurality of pivot axes, the mounting plate has a corresponding guidance surface on a side of the mounting plate opposite the pivot axis and the mounting plate has a corresponding guidance surface on a side of the frame seat opposite the pivot axis; wherein the corresponding guidance surface of the mounting plate and the corresponding guidance surface of the frame seat have complementary curved surfaces; wherein the corresponding guidance surface of the mounting plate has a radius of curvature equal to a distance between the pivot axis and the corresponding guidance surface of the mounting plate; and wherein the corresponding guidance surface of the frame seat has a radius of curvature approximately equal to a distance between the pivot axis and the corresponding guidance surface of the frame seat.
8. The mudflap hanger apparatus of claim 1 , wherein the hanger arm comprises a metal extrusion and the mounting plate comprises a thermoplastic material.
9. The mudflap hanger apparatus of claim 8 , wherein the hanger arm comprises a tubular structure, wherein the mounting plate comprises an inner extension that extends distally into a proximal end of the tubular structure and an outer extension that extends distally exterior to the proximal end of the tubular structure, wherein a slot is formed between the inner extension and the outer extension, and wherein the proximal end of the tubular structure is positioned within the slot.
10. The mudflap hanger apparatus of claim 8 , wherein the mounting plate comprises an injection molded plastic component.
11. The mudflap hanger apparatus of claim 8 , wherein the frame seat comprises a thermoplastic material.
12. The mudflap hanger apparatus of claim 11 , wherein the frame seat comprises an injection molded plastic component.
13. The mudflap hanger apparatus of claim 1 , wherein the frame seat is connected to a D ring and a D ring mount, wherein the D ring mount secures the D ring to the frame seat and a vehicle frame, and wherein the D ring secures a proximal end of the spring to the frame seat and the vehicle frame.
14. The mudflap hanger apparatus of claim 13 , wherein at least one of the D ring and the spring extends through an opening in the mounting plate.
15. The mudflap hanger apparatus of claim 14 , wherein a distal end of the spring is secured within an interior of the hanger arm by a bolt that extends laterally through the hanger arm.
16. The mudflap hanger apparatus of claim 1 , further comprising a U-bolt that extends through the frame seat and secures the frame seat and a proximal end of the spring to a vehicle frame.
17. A mudflap hanger apparatus adapted to be mounted on a vehicle, the apparatus comprising:
a hanger arm assembly having a hanger arm and a mounting plate connected to a proximal end of the hanger arm, wherein the hanger arm comprises a tubular structure having a proximal opening;
a frame seat configured to movably engage the mounting plate, wherein each of the mounting plate and the frame seat has one or more corresponding guidance surfaces, wherein the one or more guidance surfaces of the mounting plate oppose the one or more guidance surfaces of the frame seat;
a spring coupled to the hanger arm assembly and the frame seat, wherein the spring biases the mounting plate toward a resting position against the frame seat;
wherein when a lateral force is applied to the hanger arm, the mounting plate variably pivots against the frame seat at one of a plurality of pivot axes, enabling the hanger arm to move angularly away from a resting position of the hanger arm; and
wherein while the mounting plate is pivoted against the frame seat by greater than 2 degrees and less than 30 degrees about a pivot axis, the mounting plate continues to extend into the hanger arm, wherein the portion of the mounting plate extending into the hanger arm and includes at least a portion of the one or more guidance surfaces of the mounting plate.
18. The mudflap hanger apparatus of claim 17 , wherein the hanger arm surrounds and supports the portion of the mounting plate extending into the hanger arm.
19. The mudflap hanger apparatus of claim 17 , wherein in the resting position at least a portion of the one or more guidance surfaces of the frame seat extend into the hanger arm.