US20170291508A1 - Torsion spring bushing - Google Patents
Torsion spring bushing Download PDFInfo
- Publication number
- US20170291508A1 US20170291508A1 US15/096,857 US201615096857A US2017291508A1 US 20170291508 A1 US20170291508 A1 US 20170291508A1 US 201615096857 A US201615096857 A US 201615096857A US 2017291508 A1 US2017291508 A1 US 2017291508A1
- Authority
- US
- United States
- Prior art keywords
- bushing
- torsion spring
- torsion
- seat base
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
- B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
- B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
- B60N2/1635—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable characterised by the drive mechanism
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
- B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
- B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
- B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
- B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
- B60N2/1605—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable characterised by the cinematic
- B60N2/161—Rods
- B60N2/1615—Parallelogram-like structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
- B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
- B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
- B60N2/1675—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable with weight compensating means
-
- B60N2/44—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/90—Details or parts not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/12—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/01—Parts of vehicles in general
- F16C2326/08—Vehicle seats, e.g. in linear movable seats
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/08—Attachment of brasses, bushes or linings to the bearing housing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
Definitions
- the present disclosure generally relates to a vehicle seating assembly, and more particularly, a torsion tube assembly disposed within a seat bottom of the seating assembly.
- Vehicle seating assemblies may include a torsion spring disposed within a torsion tube to regulate the force for adjusting the height of the seating assembly.
- a vehicle seating assembly includes a seat back and a seat base operably connected to the seat back.
- the seat base has a seat base frame that includes a torsion tube extending laterally between at least two side members.
- a height adjustment mechanism is disposed through at least one of the side members.
- a torsion spring extends within the torsion tube and is in contact with at least two side members.
- a torsion spring bushing is positioned around the torsion spring and extends into the torsion tube.
- the torsion spring bushing defines a brush configured to contact the torsion tube and a retaining ring positioned around the torsion tube. The retaining ring is in contact with at least one side member.
- a vehicle seat base includes a seat base frame having a torsion tube extending laterally between at least two side members.
- a torsion spring extends within the torsion tube and is in contact with both side members.
- a torsion spring bushing is positioned around the torsion spring and extends into the torsion tube. The bushing defines a plurality of brushes protruding from the bushing and configured to engage the torsion tube.
- a vehicle seat base includes a seat base frame having a torsion tube extending laterally between at least two side members, a torsion spring extending within the torsion tube and a torsion spring bushing positioned around the torsion spring and extending into the torsion tube.
- the bushing defines a hinge and a fastener disposed on opposite sides of the bushing
- FIG. 1 is a top perspective view of a vehicle seat disposed inside a vehicle;
- FIG. 2 is a top perspective view of the vehicle seat of FIG. 1 ;
- FIG. 3A is a top perspective view of a seat bottom frame of the vehicle seat with a cover and padding removed;
- FIG. 3B is an enhanced view of FIG. 3A , according to the present disclosure.
- FIG. 3C is an enhanced view taken at IIIC of FIG. 3B , according to the present disclosure.
- FIG. 4 is a cross-sectional view taken along line IV of FIG. 3B , according to the present disclosure
- FIG. 5A is a front perspective view of a torsion spring bushing in an open configuration, according to the present disclosure
- FIG. 5B is a back perspective view of a torsion spring bushing in an open configuration, according to the present disclosure
- FIG. 5C is a back perspective view of a torsion spring bushing in a closed configuration, according to the present disclosure
- FIG. 6A depicts a side view of the seat bottom frame of FIG. 3A , according to the present disclosure.
- FIG. 6B depicts a top view of the seat bottom frame of FIG. 3A , according to the present disclosure.
- the terms “upper,” “lower,” “right,” “left,” “rear,” “front,” “vertical,” “horizontal,” and derivatives thereof, shall relate to the disclosure as oriented in FIG. 1 , unless stated otherwise. However, it is to be understood that the disclosure may assume various alternative orientations, except where expressly specified to the contrary. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification, are simply exemplary embodiments of the inventive concepts defined in the appended claims. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting unless the claims expressly state otherwise. Additionally, embodiments depicted in the figures may not be to scale or may incorporate features of more than one embodiment.
- the term “and/or,” when used in a list of two or more items, means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed.
- the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination.
- reference numeral 10 generally designates a vehicle in which a vehicle seating assembly 12 is positioned.
- the vehicle seating assembly 12 includes a seat back 14 and a seat base 18 .
- the seat base 18 is operably connected to the seat back 14 .
- the seat base 18 includes a seat base frame 28 having a torsion tube 32 extending laterally between at least two side members 36 .
- a height adjustment mechanism 40 is disposed through at least one of the side members 36 .
- a torsion spring 44 extends within the torsion tube 32 and is in contact with both side members 36 .
- a torsion spring bushing 48 positioned around the torsion spring 44 and extending into the torsion tube 32 .
- the torsion spring bushing 48 defines a brush 52 configured to contact the torsion tube 32 .
- a retaining ring 56 is positioned around the torsion tube 32 . The retaining ring 56 is in contact with at least one side member 36 .
- the illustrated vehicle seating assembly 12 is configured for use in a vehicle of any type, including, without limitation, cars, vans, trucks, buses, etc.
- the vehicle seating assembly 12 is suspended on rails 80 that allow movement of the vehicle seating assembly 12 in fore and aft directions within the vehicle 10 .
- the vehicle seating assembly 12 may include a variety of comfort controls, including, for example, thigh support using independent thigh supports 84 , lumbar support, and upper thoracic support.
- the seat back 14 includes both an upper seat back 88 and a lower seat back 92 .
- the vehicle seating assembly 12 includes a head restraint 96 that is disposed on the upper seat back 88 .
- the head restraint 96 is moveable between forward and rearward positions to accommodate various sized heads of passengers, as well as different heights of passengers.
- the vehicle seating assembly 12 also includes controls specifically configured to adjust an upper thoracic portion 100 of the upper seat back 88 or a lower thoracic portion 104 of the lower seat back 92 .
- the seat base frame 28 disposed within the seat base 18 ( FIG. 2 ) is the seat base frame 28 .
- the seat base frame 28 includes the torsion tube 32 which extends between the side members 36 .
- the side members 36 are operably coupled to a seat pan 112 which aids in providing support to the thigh supports 84 ( FIG. 2 ).
- the seat pan 112 may contain independently actuatable portions such that the thigh supports 84 may be moved independently of one another.
- a suspension member 116 Positioned in the center of the seat base frame 28 is a suspension member 116 configured to provide resiliency and support to cushion assemblies of the seat base 18 .
- the suspension member 116 may include a plurality of hooks 120 configured to wrap over the torsion tube 32 to support the suspension member 116 . Additionally, at least one of the side members 36 includes the height adjustment mechanism 40 ( FIG. 3B ). The height adjustment mechanism 40 may be used to adjust the height of the seat base 18 relative to a floor of the vehicle 10 , as explained in greater detail below.
- the torsion tube 32 positioned vehicle rearward of the height adjustment mechanism 40 .
- the torsion tube 32 extends between the two side members 36 , and in the depicted example, partially extends through the side members 36 .
- the side members 36 define a torsion flange 36 A configured to contact a tube ridge 32 A. The contact of the tube ridge 32 A with the side flange 36 A may be used to ensure the torsion tube 32 extends a proper distance through the side members 36 .
- the torsion tube 32 may define a pair of torsion ridges 32 A configured to lock a torsion arm 124 ( FIG. 6B ) in place.
- the retaining ring 56 Positioned around the torsion tube 32 and in contact with the side member 36 is the retaining ring 56 .
- the retaining ring 56 is positioned on an opposite side of the side member 36 than the tube ridge 32 A and is proximate the side flange 36 A.
- the retaining ring 56 is configured to grip the torsion tube 32 such that motion of the torsion tube 32 that would tend to remove it from the side member 36 is resisted and the torsion tube 32 is retained in the side member 36 .
- the retaining ring 56 includes a base portion 56 A in contact with the side member 36 and an angled portion 56 B in contact with the torsion tube 32 .
- the angled portion 56 B of the retaining ring 56 is composed of multiple parts, but may instead be a continuous structure.
- the torsion spring 44 extends substantially coaxially with the torsion tube 32 and includes bent portions 128 extending substantially perpendicular to the axis of the torsion tube 32 .
- the torsion spring 44 may store strain energy by twisting to resist motion of the seat base 18 ( FIG. 2 ) up and down relative to the floor of the vehicle 10 ( FIG. 1 ).
- the bent portions 128 bend in a vehicle rearward direction and engage side flanges 132 defined by each of the side members 36 .
- the side flanges 132 each define a securement feature 136 configured to hold the bent portions 128 in place.
- the torsion spring bushing 48 may be composed of a polymeric material, a metal, or a composite thereof.
- the torsion spring bushing 48 defines a bushing lip 144 and a bushing body 148 .
- the bushing body 148 may have a length of between about 7.5 mm and about 30.0 mm.
- the bushing body 148 may be tapered on an end configured to be inserted into the torsion tube 32 .
- the bushing lip 144 may be a continuous structure, as depicted, or may be semi-continuous around the bushing 48 (i.e. multiple discrete portions).
- the bushing lip 144 may have a thickness of between about 1.0 mm and about 5.0 mm.
- the bushing lip 144 may have a diameter, or longest length, of between about 15 mm and about 60 mm. In a specific example, the diameter of the bushing lip 144 may be about 30 mm.
- the bushing body 148 is sized to be inserted into the torsion tube 32 such that an end of the torsion tube 32 is in contact with the bushing lip 144 .
- the torsion spring bushing 48 defines an annulus 152 through which the torsion spring 44 extends. Positioned proximate the annulus 152 is a curved conical surface 156 .
- the curved conical surface 156 opens with increasing distance from the annulus 152 .
- the bushing body 148 Defined around the bushing body 148 is a plurality of protrusions 160 .
- the protrusions 160 are tall, thin, structures which extend outwardly toward the torsion tube 32 .
- the protrusions 160 may extend radially outward as far as the bushing lip 144 , or may be smaller.
- the bushing body 148 defines eight protrusions 160 , but the body 148 may define between 2 and 16 protrusions 160 .
- the bushing body 148 including the protrusions 160 , may have a diameter of between about 10 mm and about 40 mm.
- the brushes 52 are positioned on top of the protrusions 160 .
- the brushes 52 may extend the length of the bushing body 148 and protrusions 160 , only a portion of the length or may have an intermittent spacing or placement along the length of the body 148 .
- the brushes 52 may have a length along the protrusions of between about 6.0 mm and about 20 mm.
- the brushes 52 may have a height of between about 1.0 mm and about 4.0 mm.
- Each of the brushes 52 include a plurality of fibers extending radially outward from the protrusion 160 .
- the fibers of the brushes 52 may be integrally defined by the protrusions 160 or may be applied thereto.
- the fibers may be composed of the same material as the bushing 48 , or may be a different material.
- the fibers may be composed of a polymeric material, a natural material, or composite thereof.
- the brushes 52 may be flexible and capable of being pressed against the bushing body 148 and an inside surface of the torsion tube 32 .
- the brushes 52 may be equally spaced around the bushing body 148 or may be positioned in another pattern or irregular spacing. In examples where the bushing lip 144 is a discontinuous structure, the brushes 52 may be positioned between the brushing lips 144 .
- the brushes 52 may taper in width along the bushing body 148 (i.e. have more or less fibers or have a less or more dense spacing).
- the brushes 52 are configured to provide an interference fit between the torsion spring bushing 48 and the torsion tube 32 .
- the flexibility of the brushes 52 allow the brushes 52 to fill a space formed between the bushing body 148 and an inner surface of the torsion tube 32 .
- the brushes 52 are configured to create friction between the torsion tube 32 and the torsion spring bushing 48 such that lateral motion of the bushing 48 out of the tube 32 is resisted. Additionally, the interference fit between the torsion spring bushing 48 and the torsion tube 32 resists rotational movement of the bushing 48 within the torsion tube 32 .
- the inner surface of the torsion tube 32 may be roughened. In such examples, the roughened inner surface of the torsion tube 32 may generate a greater friction between the torsion tube 32 and the brushes 52 of the torsion spring bushing 48 thereby generating a stronger interference fit.
- the torsion spring bushing 48 is configured to be operated between substantially open ( FIG. 5A and 5B ) and substantially closed ( FIG. 5C ) configurations.
- the torsion spring bushing 48 includes a hinge 168 which allows the bushing 48 to rotate between the open and closed positions.
- the hinge 168 may be a living hinge.
- the hinge 168 is positioned between two of the protrusions 160 .
- Disposed around the hinge 168 is an alignment feature 170 .
- the alignment feature 170 may be formed anywhere around the torsion spring bushing 48 .
- the alignment feature 170 may be formed in the bushing lip 144 as a general V-shaped opening.
- the torsion tube 32 may include one or more indicia (e.g., engraving and/or markings) which may be aligned with the alignment feature 170 .
- the V-shaped opening of the alignment feature 170 may have an angular extent greater than about 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, or 100°.
- the indicia and the alignment feature 170 may cooperate to define a general “arrow” shape.
- Such use of the indicia and the alignment feature 170 may allow the torsion spring bushing 48 to be quickly, and accurately, placed during assembly.
- a bushing fastener 172 disposed on an opposite side of the torsion spring bushing 48 .
- the bushing fastener 172 includes opposing ridges 172 A on opposing flanges 172 B.
- the opposing ridges 172 A are configured to snap together as the torsion spring bushing 48 is rotated to the substantially closed position around the torsion spring 44 .
- the torsion spring bushing 48 may not include the hinge 168 , but rather include a similar bushing fastener 172 where the hinge 168 is depicted. In such an example, the torsion spring bushing 48 may be in two pieces until assembled (e.g., clicked together) around the torsion spring 44 .
- the height adjustment mechanism 40 includes a handle 180 configured to rotate a gear 184 in contact with the torsion arm 124 .
- the torsion arm 124 defines a plurality of teeth 188 configured to engage with the gear 184 such that rotation of the gear 184 (e.g., through motion of the handle 180 ) causes the torsion arm 124 to move along the gear 184 . Movement of the torsion arm 124 causes the height of the seat base 18 ( FIG. 2 ) to increase or decrease.
- the torsion spring 44 may store strain energy to regulate the force needed for upward or downward motion of the seat base 18 .
- use of the brushes 52 may prevent the force needed to increase the height of the seat base 18 from increasing over time.
- bushings in torsion tubes may undergo rotational and lateral movement out of the tube, thereby contacting the torsion spring.
- increasing contact with the torsion spring may increase the force necessary to adjust the height of the seat.
- use of the brushes 52 may create an interference fit between the torsion spring bushing 48 and the torsion tube 32 such that the bushing 48 is resisted from negatively impacting the torsion spring 44 .
- bushing fastener 172 and/or the hinge 168 may allow for quick and easy assembly of the bushing 48 around the torsion spring 44 .
- alignment feature 170 may allow fast and accurate placement of the bushing 48 in the torsion tube 32 .
Abstract
A vehicle seating assembly is provided which includes a seat back and a seat base operably connected to the seat back. The seat base has a seat base frame that includes a torsion tube extending laterally between at least two side members. A height adjustment mechanism is disposed through at least one of the side members. A torsion spring extends within the torsion tube and is in contact with at least two side members. A torsion spring bushing is positioned around the torsion spring and extends into the torsion tube. The torsion spring bushing defines a brush configured to contact the torsion tube and a retaining ring positioned around the torsion tube. The retaining ring is in contact with at least one side member.
Description
- The present disclosure generally relates to a vehicle seating assembly, and more particularly, a torsion tube assembly disposed within a seat bottom of the seating assembly.
- Vehicle seating assemblies may include a torsion spring disposed within a torsion tube to regulate the force for adjusting the height of the seating assembly.
- According to one aspect of the present disclosure, a vehicle seating assembly is provided that includes a seat back and a seat base operably connected to the seat back. The seat base has a seat base frame that includes a torsion tube extending laterally between at least two side members. A height adjustment mechanism is disposed through at least one of the side members. A torsion spring extends within the torsion tube and is in contact with at least two side members. A torsion spring bushing is positioned around the torsion spring and extends into the torsion tube. The torsion spring bushing defines a brush configured to contact the torsion tube and a retaining ring positioned around the torsion tube. The retaining ring is in contact with at least one side member.
- According to another aspect of the present disclosure, a vehicle seat base is provided that includes a seat base frame having a torsion tube extending laterally between at least two side members. A torsion spring extends within the torsion tube and is in contact with both side members. A torsion spring bushing is positioned around the torsion spring and extends into the torsion tube. The bushing defines a plurality of brushes protruding from the bushing and configured to engage the torsion tube.
- According to yet another aspect of the present disclosure, a vehicle seat base is provided that includes a seat base frame having a torsion tube extending laterally between at least two side members, a torsion spring extending within the torsion tube and a torsion spring bushing positioned around the torsion spring and extending into the torsion tube. The bushing defines a hinge and a fastener disposed on opposite sides of the bushing
- These and other aspects, objects, and features of the present disclosure will be understood and appreciated by those skilled in the art upon studying the following specification, claims, and appended drawings.
- In the drawings:
-
FIG. 1 is a top perspective view of a vehicle seat disposed inside a vehicle; -
FIG. 2 is a top perspective view of the vehicle seat ofFIG. 1 ; -
FIG. 3A is a top perspective view of a seat bottom frame of the vehicle seat with a cover and padding removed; -
FIG. 3B is an enhanced view ofFIG. 3A , according to the present disclosure; -
FIG. 3C is an enhanced view taken at IIIC ofFIG. 3B , according to the present disclosure; -
FIG. 4 is a cross-sectional view taken along line IV ofFIG. 3B , according to the present disclosure; -
FIG. 5A is a front perspective view of a torsion spring bushing in an open configuration, according to the present disclosure; -
FIG. 5B is a back perspective view of a torsion spring bushing in an open configuration, according to the present disclosure; -
FIG. 5C is a back perspective view of a torsion spring bushing in a closed configuration, according to the present disclosure; -
FIG. 6A depicts a side view of the seat bottom frame ofFIG. 3A , according to the present disclosure; and -
FIG. 6B depicts a top view of the seat bottom frame ofFIG. 3A , according to the present disclosure. - Reference will now be made in detail to the present embodiments, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals will be used throughout the drawings to refer to the same or like parts.
- For purposes of description herein, the terms “upper,” “lower,” “right,” “left,” “rear,” “front,” “vertical,” “horizontal,” and derivatives thereof, shall relate to the disclosure as oriented in
FIG. 1 , unless stated otherwise. However, it is to be understood that the disclosure may assume various alternative orientations, except where expressly specified to the contrary. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification, are simply exemplary embodiments of the inventive concepts defined in the appended claims. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting unless the claims expressly state otherwise. Additionally, embodiments depicted in the figures may not be to scale or may incorporate features of more than one embodiment. - As used herein, the term “and/or,” when used in a list of two or more items, means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed. For example, if a composition is described as containing components A, B, and/or C, the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination.
- Referring now to
FIGS. 1-6B ,reference numeral 10 generally designates a vehicle in which avehicle seating assembly 12 is positioned. Thevehicle seating assembly 12 includes aseat back 14 and aseat base 18. Theseat base 18 is operably connected to the seat back 14. Theseat base 18 includes aseat base frame 28 having atorsion tube 32 extending laterally between at least twoside members 36. Aheight adjustment mechanism 40 is disposed through at least one of theside members 36. Atorsion spring 44 extends within thetorsion tube 32 and is in contact with bothside members 36. A torsion spring bushing 48 positioned around thetorsion spring 44 and extending into thetorsion tube 32. Thetorsion spring bushing 48 defines abrush 52 configured to contact thetorsion tube 32. Aretaining ring 56 is positioned around thetorsion tube 32. Theretaining ring 56 is in contact with at least oneside member 36. - Referring now to
FIGS. 1 and 2 , the illustratedvehicle seating assembly 12 is configured for use in a vehicle of any type, including, without limitation, cars, vans, trucks, buses, etc. Thevehicle seating assembly 12 is suspended onrails 80 that allow movement of thevehicle seating assembly 12 in fore and aft directions within thevehicle 10. In addition, thevehicle seating assembly 12 may include a variety of comfort controls, including, for example, thigh support using independent thigh supports 84, lumbar support, and upper thoracic support. The seat back 14 includes both an upper seat back 88 and a lower seat back 92. Thevehicle seating assembly 12 includes ahead restraint 96 that is disposed on the upper seat back 88. Thehead restraint 96 is moveable between forward and rearward positions to accommodate various sized heads of passengers, as well as different heights of passengers. Thevehicle seating assembly 12 also includes controls specifically configured to adjust an upperthoracic portion 100 of the upper seat back 88 or a lowerthoracic portion 104 of the lower seat back 92. - Referring now to
FIG. 3A , disposed within the seat base 18 (FIG. 2 ) is theseat base frame 28. As explained above, theseat base frame 28 includes thetorsion tube 32 which extends between theside members 36. Theside members 36 are operably coupled to aseat pan 112 which aids in providing support to the thigh supports 84 (FIG. 2 ). In some examples, theseat pan 112 may contain independently actuatable portions such that the thigh supports 84 may be moved independently of one another. Positioned in the center of theseat base frame 28 is asuspension member 116 configured to provide resiliency and support to cushion assemblies of theseat base 18. Thesuspension member 116 may include a plurality ofhooks 120 configured to wrap over thetorsion tube 32 to support thesuspension member 116. Additionally, at least one of theside members 36 includes the height adjustment mechanism 40 (FIG. 3B ). Theheight adjustment mechanism 40 may be used to adjust the height of theseat base 18 relative to a floor of thevehicle 10, as explained in greater detail below. - Referring now to
FIGS. 3B, 3C and 4 , positioned vehicle rearward of theheight adjustment mechanism 40 is thetorsion tube 32. Thetorsion tube 32 extends between the twoside members 36, and in the depicted example, partially extends through theside members 36. Theside members 36 define atorsion flange 36A configured to contact atube ridge 32A. The contact of thetube ridge 32A with theside flange 36A may be used to ensure thetorsion tube 32 extends a proper distance through theside members 36. Thetorsion tube 32 may define a pair oftorsion ridges 32A configured to lock a torsion arm 124 (FIG. 6B ) in place. Positioned around thetorsion tube 32 and in contact with theside member 36 is the retainingring 56. The retainingring 56 is positioned on an opposite side of theside member 36 than thetube ridge 32A and is proximate theside flange 36A. The retainingring 56 is configured to grip thetorsion tube 32 such that motion of thetorsion tube 32 that would tend to remove it from theside member 36 is resisted and thetorsion tube 32 is retained in theside member 36. The retainingring 56 includes abase portion 56A in contact with theside member 36 and an angled portion 56B in contact with thetorsion tube 32. In the depicted example, the angled portion 56B of the retainingring 56 is composed of multiple parts, but may instead be a continuous structure. - Extending through the
torsion tube 32 is thetorsion spring 44. Thetorsion spring 44 extends substantially coaxially with thetorsion tube 32 and includesbent portions 128 extending substantially perpendicular to the axis of thetorsion tube 32. Thetorsion spring 44 may store strain energy by twisting to resist motion of the seat base 18 (FIG. 2 ) up and down relative to the floor of the vehicle 10 (FIG. 1 ). Thebent portions 128 bend in a vehicle rearward direction and engageside flanges 132 defined by each of theside members 36. Theside flanges 132 each define asecurement feature 136 configured to hold thebent portions 128 in place. - Referring now to
FIGS. 4, and 5A -C, positioned around thetorsion spring 44 is thetorsion spring bushing 48. Thetorsion spring bushing 48 may be composed of a polymeric material, a metal, or a composite thereof. Thetorsion spring bushing 48 defines abushing lip 144 and abushing body 148. Thebushing body 148 may have a length of between about 7.5 mm and about 30.0 mm. Thebushing body 148 may be tapered on an end configured to be inserted into thetorsion tube 32. Thebushing lip 144 may be a continuous structure, as depicted, or may be semi-continuous around the bushing 48 (i.e. multiple discrete portions). Thebushing lip 144 may have a thickness of between about 1.0 mm and about 5.0 mm. Thebushing lip 144 may have a diameter, or longest length, of between about 15 mm and about 60 mm. In a specific example, the diameter of thebushing lip 144 may be about 30 mm. Thebushing body 148 is sized to be inserted into thetorsion tube 32 such that an end of thetorsion tube 32 is in contact with thebushing lip 144. Thetorsion spring bushing 48 defines anannulus 152 through which thetorsion spring 44 extends. Positioned proximate theannulus 152 is a curvedconical surface 156. The curvedconical surface 156 opens with increasing distance from theannulus 152. Defined around thebushing body 148 is a plurality ofprotrusions 160. Theprotrusions 160 are tall, thin, structures which extend outwardly toward thetorsion tube 32. Theprotrusions 160 may extend radially outward as far as thebushing lip 144, or may be smaller. In the depicted example, thebushing body 148 defines eightprotrusions 160, but thebody 148 may define between 2 and 16protrusions 160. Thebushing body 148, including theprotrusions 160, may have a diameter of between about 10 mm and about 40 mm. - Positioned around the
bushing body 148 is a plurality ofbrushes 52. Thebrushes 52 are positioned on top of theprotrusions 160. Thebrushes 52 may extend the length of thebushing body 148 andprotrusions 160, only a portion of the length or may have an intermittent spacing or placement along the length of thebody 148. Thebrushes 52 may have a length along the protrusions of between about 6.0 mm and about 20 mm. Thebrushes 52 may have a height of between about 1.0 mm and about 4.0 mm. Each of thebrushes 52 include a plurality of fibers extending radially outward from theprotrusion 160. The fibers of thebrushes 52 may be integrally defined by theprotrusions 160 or may be applied thereto. The fibers may be composed of the same material as thebushing 48, or may be a different material. For example, the fibers may be composed of a polymeric material, a natural material, or composite thereof. Thebrushes 52 may be flexible and capable of being pressed against thebushing body 148 and an inside surface of thetorsion tube 32. Thebrushes 52 may be equally spaced around thebushing body 148 or may be positioned in another pattern or irregular spacing. In examples where thebushing lip 144 is a discontinuous structure, thebrushes 52 may be positioned between the brushinglips 144. Thebrushes 52 may taper in width along the bushing body 148 (i.e. have more or less fibers or have a less or more dense spacing). - The
brushes 52 are configured to provide an interference fit between thetorsion spring bushing 48 and thetorsion tube 32. The flexibility of thebrushes 52 allow thebrushes 52 to fill a space formed between thebushing body 148 and an inner surface of thetorsion tube 32. Thebrushes 52 are configured to create friction between thetorsion tube 32 and thetorsion spring bushing 48 such that lateral motion of thebushing 48 out of thetube 32 is resisted. Additionally, the interference fit between thetorsion spring bushing 48 and thetorsion tube 32 resists rotational movement of thebushing 48 within thetorsion tube 32. In some examples, the inner surface of thetorsion tube 32 may be roughened. In such examples, the roughened inner surface of thetorsion tube 32 may generate a greater friction between thetorsion tube 32 and thebrushes 52 of thetorsion spring bushing 48 thereby generating a stronger interference fit. - The
torsion spring bushing 48 is configured to be operated between substantially open (FIG. 5A and 5B ) and substantially closed (FIG. 5C ) configurations. Thetorsion spring bushing 48 includes ahinge 168 which allows thebushing 48 to rotate between the open and closed positions. In various examples, thehinge 168 may be a living hinge. Thehinge 168 is positioned between two of theprotrusions 160. Disposed around thehinge 168 is analignment feature 170. In other examples, thealignment feature 170 may be formed anywhere around thetorsion spring bushing 48. Thealignment feature 170 may be formed in thebushing lip 144 as a general V-shaped opening. Thetorsion tube 32 may include one or more indicia (e.g., engraving and/or markings) which may be aligned with thealignment feature 170. The V-shaped opening of thealignment feature 170 may have an angular extent greater than about 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, or 100°. In a specific example, the indicia and thealignment feature 170 may cooperate to define a general “arrow” shape. Such use of the indicia and thealignment feature 170 may allow thetorsion spring bushing 48 to be quickly, and accurately, placed during assembly. In the depicted example, disposed on an opposite side of thetorsion spring bushing 48 is abushing fastener 172. Thebushing fastener 172 includes opposingridges 172A on opposingflanges 172B. The opposingridges 172A are configured to snap together as thetorsion spring bushing 48 is rotated to the substantially closed position around thetorsion spring 44. It will be understood that in alternate examples, thetorsion spring bushing 48 may not include thehinge 168, but rather include asimilar bushing fastener 172 where thehinge 168 is depicted. In such an example, thetorsion spring bushing 48 may be in two pieces until assembled (e.g., clicked together) around thetorsion spring 44. - Referring now to
FIGS. 6A and 6B , theheight adjustment mechanism 40 includes ahandle 180 configured to rotate agear 184 in contact with thetorsion arm 124. Thetorsion arm 124 defines a plurality ofteeth 188 configured to engage with thegear 184 such that rotation of the gear 184 (e.g., through motion of the handle 180) causes thetorsion arm 124 to move along thegear 184. Movement of thetorsion arm 124 causes the height of the seat base 18 (FIG. 2 ) to increase or decrease. As explained above, thetorsion spring 44 may store strain energy to regulate the force needed for upward or downward motion of theseat base 18. - Various advantages may be gained through the use of the present disclosure. For example, use of the
brushes 52 may prevent the force needed to increase the height of theseat base 18 from increasing over time. In traditional systems, bushings in torsion tubes may undergo rotational and lateral movement out of the tube, thereby contacting the torsion spring. As the bushing moves out of the torsion tube, increasing contact with the torsion spring may increase the force necessary to adjust the height of the seat. However, use of thebrushes 52 may create an interference fit between thetorsion spring bushing 48 and thetorsion tube 32 such that thebushing 48 is resisted from negatively impacting thetorsion spring 44. Additionally, use of thebushing fastener 172 and/or thehinge 168 may allow for quick and easy assembly of thebushing 48 around thetorsion spring 44. Further, thealignment feature 170 may allow fast and accurate placement of thebushing 48 in thetorsion tube 32. - It is to be understood that variations and modifications can be made on the aforementioned structure without departing from the concepts of the present disclosure, and further it is to be understood that such concepts are intended to be covered by the following claims unless these claims by their language expressly state otherwise.
Claims (20)
1. A vehicle seating assembly comprising:
a seat back; and
a seat base operably connected to the seat back, the seat base having a seat base frame comprising:
a torsion tube extending laterally between at least two side members;
a height adjustment mechanism disposed through at least one of the side members;
a torsion spring extending within the torsion tube and in contact with at least two side members;
a torsion spring bushing positioned around the torsion spring and extending into the torsion tube, the torsion spring bushing defining a brush configured to contact the torsion tube; and
a retaining ring positioned around the torsion tube, the retaining ring in contact with at least one side member.
2. The vehicle seating assembly of claim 1 , wherein the torsion spring bushing comprises a polymeric material.
3. The vehicle seating assembly of claim 1 , wherein the retaining ring defines an angled portion.
4. The vehicle seating assembly of claim 1 , wherein the torsion spring bushing is configured to center the torsion spring within the torsion tube.
5. The vehicle seating assembly of claim 1 , wherein the torsion spring bushing defines a plurality of brushes.
6. The vehicle seating assembly of claim 5 , wherein the plurality of brushes are configured to resist lateral and rotational movement of the torsion spring bushing within the torsion tube.
7. A vehicle seat base comprising:
a seat base frame having a torsion tube extending laterally between at least two side members;
a torsion spring extending within the torsion tube and in contact with both side members; and
a torsion spring bushing positioned around the torsion spring and extending into the torsion tube, the bushing defining a plurality of brushes protruding from the bushing and configured to engage the torsion tube.
8. The vehicle seat base of claim 7 , wherein the bushing defines an annulus around which a plurality of protrusions is defined.
9. The vehicle seat base of claim 8 , wherein the plurality of brushes are positioned on the plurality of protrusions.
10. The vehicle seat base of claim 7 , wherein the plurality of brushes are equally spaced on the torsion spring bushing.
11. The vehicle seat base of claim 7 , wherein the plurality of brushes extend on the torsion spring bushing laterally relative to the torsion tube.
12. The vehicle seat base of claim 7 , wherein each of the plurality of brushes comprise a plurality of fibers.
13. The vehicle seat base of claim 12 , wherein the plurality of fibers comprise a polymeric material.
14. A vehicle seat base comprising:
a seat base frame having a torsion tube extending laterally between at least two side members;
a torsion spring extending within the torsion tube; and
a torsion spring bushing positioned around the torsion spring and extending into the torsion tube, the bushing defining a hinge and a fastener disposed on opposite sides of the bushing.
15. The vehicle seat base of claim 14 , wherein the hinge of the torsion spring bushing is configured to allow the bushing to open and close.
16. The vehicle seat base of claim 14 , wherein the hinge of the bushing is a living hinge.
17. The vehicle seat base of claim 14 , further comprising:
an alignment feature defined by the torsion spring bushing, wherein the hinge is positioned within the alignment feature.
18. The vehicle seat base of claim 14 , wherein the alignment feature is generally V-shaped.
19. The vehicle seat base of claim 18 , wherein the fastener and secondary fastener each comprise a snap feature.
20. The vehicle seat base of claim 14 , wherein the bushing defines an annulus having a curved conical shape.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/096,857 US9802512B1 (en) | 2016-04-12 | 2016-04-12 | Torsion spring bushing |
RU2017111046A RU2729839C2 (en) | 2016-04-12 | 2017-04-03 | Seat assembly and seat base (versions) for vehicle |
CN201710224762.3A CN107284294B (en) | 2016-04-12 | 2017-04-07 | Torsion spring bushing |
DE102017107741.3A DE102017107741A1 (en) | 2016-04-12 | 2017-04-10 | Torsionsfederbuchse |
MX2017004785A MX2017004785A (en) | 2016-04-12 | 2017-04-11 | Torsion spring bushing. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US15/096,857 US9802512B1 (en) | 2016-04-12 | 2016-04-12 | Torsion spring bushing |
Publications (2)
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US20170291508A1 true US20170291508A1 (en) | 2017-10-12 |
US9802512B1 US9802512B1 (en) | 2017-10-31 |
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US15/096,857 Active 2036-05-18 US9802512B1 (en) | 2016-04-12 | 2016-04-12 | Torsion spring bushing |
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US (1) | US9802512B1 (en) |
CN (1) | CN107284294B (en) |
DE (1) | DE102017107741A1 (en) |
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US20180236903A1 (en) * | 2015-09-04 | 2018-08-23 | Jaguar Land Rover Limited | Vehicle seat assembly |
US20190291609A1 (en) * | 2016-07-28 | 2019-09-26 | Tachi-S Co., Ltd. | Vehicle seat |
US11801780B2 (en) | 2018-04-13 | 2023-10-31 | Clearmotion Acquisition I Llc | Active seat suspension systems including systems with non-back-drivable actuators |
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JP2018094991A (en) * | 2016-12-09 | 2018-06-21 | トヨタ紡織株式会社 | Vehicular seat |
DE202021104964U1 (en) * | 2020-09-15 | 2021-12-02 | Pi̇lot Taşit Koltuklari Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ | Gear mechanism assembly for vehicle seats |
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Also Published As
Publication number | Publication date |
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RU2729839C2 (en) | 2020-08-12 |
RU2017111046A (en) | 2018-10-03 |
DE102017107741A1 (en) | 2017-10-12 |
CN107284294A (en) | 2017-10-24 |
MX2017004785A (en) | 2018-08-16 |
RU2017111046A3 (en) | 2020-05-29 |
CN107284294B (en) | 2021-06-18 |
US9802512B1 (en) | 2017-10-31 |
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