CN1543412A - Headlight support structure for motorcycle - Google Patents

Headlight support structure for motorcycle Download PDF

Info

Publication number
CN1543412A
CN1543412A CNA018235271A CN01823527A CN1543412A CN 1543412 A CN1543412 A CN 1543412A CN A018235271 A CNA018235271 A CN A018235271A CN 01823527 A CN01823527 A CN 01823527A CN 1543412 A CN1543412 A CN 1543412A
Authority
CN
China
Prior art keywords
cover
handle
pair
anterior
head lamp
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
Application number
CNA018235271A
Other languages
Chinese (zh)
Other versions
CN1307075C (en
Inventor
广濑义久
高田康弘
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Publication of CN1543412A publication Critical patent/CN1543412A/en
Application granted granted Critical
Publication of CN1307075C publication Critical patent/CN1307075C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62JCYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J23/00Other protectors specially adapted for cycles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62JCYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J6/00Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
    • B62J6/02Headlights
    • B62J6/022Headlights specially adapted for motorcycles or the like
    • B62J6/027Supporting means therefor, e.g. mounting brackets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62JCYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J6/00Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
    • B62J6/05Direction indicators
    • B62J6/055Electrical means, e.g. lamps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62KCYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K21/00Steering devices
    • B62K21/12Handlebars; Handlebar stems

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

In a motorcycle having front and rear covers adapted to constitute a handle cover, in order to swingably support the headlight while avoiding the use of a slide die during formation of the front and rear covers and making it possible to simplify the shape of each cover, a pair of support shafts (51) swingably supported as they are held from front and behind by a pair of first bearing halves (59) provided on a front cover (49) and a pair of second bearing halves (60) installed on both direction indicators (47) coaxially project from the right and left sides of the headlight (46).

Description

Two-wheeled headlight support structure
Technical field
The present invention relates to the head lamp of the scalable optical axis being installed covering on the plastic handle cover of handle, install simultaneously be configured in head lamp about a pair of turning indicator two-wheeled, the particularly improvement of headlight support structure.
Background technology
In No. 2767240 communique of Japanese Patent, disclose by from below cover handle plastic lower cover and from above cover on the handle cover that the plastic upper lid of handle constitutes, head lamp is installed and can be regulated optical axis, the structure of pair of right and left turning indicator is installed simultaneously, in this structure, in the upper end that is arranged on the tabular support of lower cover integratedly, the bearing portion of the fulcrum that setting has about it from below supporting head lamp, open upward roughly U font is made by this bearing portion, and the outstanding projection that is arranged on the head lamp bottom is connected on the lower cover and can regulates front and back position.
; the occasion that has; handle cover is used from the plastic anterior cover of front side covering handle with from the plastic rear portion of rear side covering handle and is covered formation; forwardly cover is gone up and head lamp is installed and can be regulated optical axis; the turning indicator of pair of right and left is installed simultaneously; this occasion; when adopting the supporting construction of above-mentioned original head lamp; the branch mould direction of the front and rear cover that is shaped by synthetic resin pattern is vertical with the moving direction of the mould that is used to form the bearing portion of supporting the fulcrum that head lamp has from the below about it; owing to have to use sliding formwork, so the manufacturing cost of handle cover uprises.Therefore require not use gliding model ground to realize the structure of supporting head lamp, at this moment, wish to avoid complex-shapedization of handle cover.
Summary of the invention
In view of such situation, the objective of the invention is to, provide a kind of and constitute the two-wheeled of handle cover, can avoid using sliding formwork can make the simple shapeization of each cover simultaneously when forwardly cover and rear portion cover is shaped, and can joltily support the headlight support structure of head lamp by front portion cover and rear portion cover.
In order to achieve the above object, in two-wheeled headlight support structure of the present invention, the handle cover of covering handle covers by the plastic anterior cover that covers handle from front side with from the plastic rear portion of rear side covering handle and constitutes, forwardly cover is gone up and head lamp is installed and can be regulated optical axis, the turning indicator of the pair of right and left that is configured in head lamp is installed simultaneously, it the 1st is characterised in that, with a pair of fulcrum that a pair of the 1st bearing half one on the side who is arranged on anterior cover and rear portion cover and a pair of the 2nd bearing half one that is arranged on aforementioned two turning indicators clamp from front and back and can joltily be supported, outstanding coaxially being arranged on the left and right sides of head lamp.
According to such formation, the a pair of fulcrum that head lamp has coaxially in its left and right sides, clamp from front and back and can joltily be supported with each a pair of the 1st bearing half one and the 2nd bearing half one respectively, be arranged on the 1st bearing half one on the side who covers in anterior cover and rear portion, owing to carry out the model shaping on the branch mould direction in the time of can being shaped at model equidirectional with front portion cover and rear portion cover, so do not need sliding formwork, can reduce the manufacturing cost of handle cover, and, the 1st bearing half one be owing to can be simple shape towards a side of aforementioned minute mould direction, so can simplify the shape that cover at anterior cover and rear portion.
In addition, the present invention except the structure of above-mentioned the 1st feature and, it the 2nd is characterised in that, on the top of aforementioned approaches to indicator lamp, give prominence to with interconnecting be provided for these turning indicators be installed on the anterior cover installation portion and with aforementioned the 2nd bearing half one of this installation portion adjacency.According to such formation, because near the 2nd bearing half one of half one of the fulcrum of supporting head lamp, turning indicator is installed on the anterior cover, so can improve the supporting rigidity by the 2nd bearing half supporting bolster.
Description of drawings
Fig. 1~Fig. 7 is the figure of expression one embodiment of the present of invention,
Fig. 1 is two-wheeled lateral plan,
Fig. 2 is the amplification front elevation of seeing from 2 directions of arrow of Fig. 1,
Fig. 3 is the amplification plan view of seeing from 3 directions of arrow of Fig. 1,
Fig. 4 is the 4-4 line section-drawing of Fig. 3,
Fig. 5 is the view of 5 arrows of the Fig. 4 under the state that omits anterior cover,
Fig. 6 is the 6-6 line amplification profile of Fig. 4,
Fig. 7 is the 7-7 line amplification profile of Fig. 2.
The specific embodiment
With reference to Fig. 1~Fig. 7 one embodiment of the present of invention are described, at first, in Fig. 1, this two-wheeled vehicle frame F has: the head pipe 12 of rotatably support front fork 11, from the beginning manage the 12 mono-main car frames 13 that extend to the back lower place, be connected with the rear portion of this main car frame 13 and to the back vehicle frame 14 of the pair of right and left of back upper place extension ...
Lower end at front fork 11 is supported with front-wheel WF by axle pivotally, connects handle 15 in the upper end of front fork 11, and the mudwing 16 that covers the top of front-wheel WF is supported by front fork 11.
Welding boatswain chair 17 on the pars intermedia two sides of main car frame 13, welding pivot support plate 18 on the two sides, rear portion of main car frame 13.In addition, configuration engine unit E below main car frame 13, this engine unit E is supported and is suspended on the vehicle frame F by aforementioned boatswain chair 17 and pivot support plate 18.
Fulcrum 19 cylindraceous is set on pivot support plate 18, on the both ends of this fulcrum 19, can supports the back vent 20 of pair of right and left with fluctuating ... leading section, at two back vents 20 ... the rear end between by an axle supporting wheels WR.The top of this trailing wheel WR is installed in back vehicle frame 14 ... on rear mudguard 21 cover.In addition, at back vehicle frame 14 ... with back vent 20 ... the rear portion between be provided with respectively the back buffer cell 22 ...
Above trailing wheel WR, configuration back vehicle frame 14 ... the Fuel Tank 23 of supporting is at the place ahead of this Fuel Tank 23 one side configuration back vehicle frame 14 ... the receiver 24 of supporting.
The plastic cover 25 that covers this vehicle frame F is installed on vehicle frame F, and this cover 25 is by the front side cover 26 of the left and right sides that is configured in main car frame 13 ... cover occupant's shank from the place ahead and cover 26 with two front sides ... the leg protective cover 27 that links to each other of front portion ... from front side cover head pipe 12 and with two leg protective covers 27 ... the preceding overhead guard 28 that links to each other, cover the main car frame overhead guard 29 that head pipe 12 covers main car frame 13 and links to each other with preceding overhead guard 28 from upper side simultaneously from rear side, with two front sides cover 26 ... the following cover 30 that links to each other of bottom ... cover back vehicle frame 14 from both sides ... the rear side cover 31 of Fuel Tank 23 and receiver 24 ... constitute.
At two rear side covers 31 ... top between, cover the front and back Dual saddle 32 of receiver 24 and Fuel Tank 23 from the top, switchably be configured to can in receiver 24, take in article and from receiver 24, take out article.
In the lump with reference to Fig. 2 and Fig. 3, have at two ends, the left and right sides on the right part of handle 15 of handle 34,35, be provided with the manipulable control stalk 37 of hand of holding handle 35.The central portion of this handle 15 makes aforementioned handle 34 outstanding from the left side, makes aforementioned handle 35 and control stalk 37 give prominence to from its right side and cover with handle cover 38 simultaneously.
This handle cover 38 interconnects by the plastic anterior cover 39 that covers handle 15 from front side with from the plastic rear portion cover 40 that rear side covers handle 15 and forms, and rear portion cover 40 is installed on the handle 15.
In the center upper portion of the rear portion of handle cover 38 cover 40, instrument pack 41 is installed.In addition, the supporting arm 42,42 of the left and right sides that connects anterior cover 39 is installed on handle 15, the back prestige mirror 43,43 at the driver's observation rear before and after being used on the Dual saddle 32 is installed in the upper end of aforementioned supporting arm 42,42.
Forwardly cover on 39, be provided with peristome 44 that disposes on its front central portion and the peristome that disposes on the left and right sides of this peristome 44 45,45, the head lamp 46 that is configured on the peristome 44 is that optical axis is regulated by the adjusting that is configured on the peristome 45,45 respectively and be installed in turning indicator 47,47 and 39 supportings of anterior cover on the anterior cover 39 and can carry out the direction of illumination of above-below direction.
In Fig. 4~Fig. 6, head lamp 46 by inner face as catadioptre and the place ahead form open bowl-shape plastic lamp body 48, remain on bulb 49 on the central portion in the lamp body 48, the front lens 50 that cover the front end opening of lamp body 48 constitute.And on the left and right sides of the lamp body 48 of this head lamp 46, the outstanding coaxially fulcrum 51 that is provided with ...
Turning indicator 47, by inner face as catadioptre and the place ahead form open bowl-shape plastic lamp body 52, remain on bulb 53 on the central portion in the lamp body 52, the front lens 54 that cover the front end opening of lamp body 52 constitute.On the lamp body 52 of this turning indicator 47, the empty standard width of a room in an old-style house of its circumferencial direction every 3 places for example, a plurality of places, outstanding installation portion 55,56,57 is set, these installation portions 55,56,57 are by screw member 58 ... be connected on the anterior cover 39.
Aforementioned two fulcrums 51 ..., by this fulcrum 51 of supporting ... forebody and be arranged on a pair of the 1st bearing half one 59 on the anterior cover 39 integratedly ... be arranged on all directions indicator lamp 47 integratedly ... lamp body 52 on and support aforementioned fulcrum 51 ... latter half of a pair of the 2nd bearing half one 60 ... can joltily support.
And, the 2nd bearing half one 60, for turning indicator 47 being installed on the anterior cover 39, on the position of the installation portion 55 that is provided with on the top of the lamp body 52 among the installation portion 55,56,57 that is adjacent on the lamp body 52 that is arranged on this turning indicator 47, interconnect and outstanding being arranged on the aforementioned lamp body 52 with this installation portion 55.
In Fig. 7, on the bottom of the lamp body 48 of head lamp 46, be provided with relative with the bottom surface of lamp body 48 and with forwardly cover the nut 62 that the bearing surface 61 that forms on 39 the lower inner face is slipped, insert the screw member 64 of the slotted hole 63 that leads to the bottom that extends upward and be arranged on anterior cover 39 in front and back, screw in the aforementioned nut 62.
And, by unclamping screw member 64, nut 62 can move on the position arbitrarily of the length direction of slotted hole 63, by moving this lug boss 62, head lamp 46 is around its fulcrum 51 ... axis shake, by fastening aforementioned screw member 64, can be the posture of shaking of head lamp 46 that the optical axis of head lamp 46 keeps certain.And, in order to operate screw member 64, forwardly covering outside, 39 bottom and form recess 65 towards the head of aforementioned screw member 64, this recess 65 is forwards open with the below.
Next the effect to this embodiment describes, the a pair of fulcrum 51 that head lamp 46 has coaxially in its both sides ..., be supported this fulcrum 51 ... forebody and be arranged on a pair of the 1st bearing half one 59 on the anterior cover 39 integratedly ... be arranged on all directions indicator lamp 47 that is installed on the anterior cover 39 integratedly ... lamp body 52 on and support aforementioned fulcrum 51 ... latter half of a pair of the 2nd bearing half one 60 ... can joltily support.
Promptly, fulcrum 51 ... by each a pair of the 1st bearing half one 59 ... with the 2nd bearing half one 66 ... clamp and can joltily support from front and back, be arranged on the 1st bearing half one 59 on the anterior cover 39 ... owing to carry out model forming on branch mould direction that can be the time equidirectional with the model forming of front portion cover 39, so do not need sliding formwork, therefore, can reduce the manufacturing cost of handle cover 38.And the 1st bearing half one 59 ..., owing to can be simple shape towards a side of aforementioned minute mould direction, the shape of anterior cover 39 and rear portion cover 40 also can be oversimplified.
In addition, at all directions indicator lamp 47 ... top, owing to be used for these turning indicators 47 ... be installed in the installation portion 55 on the anterior cover 39 ... with with this installation portion 55 ... the 2nd bearing half one 60 of adjacency ... interconnect and be highlighted setting, so fulcrum 51 at supporting head lamp 46 ... latter half of the 2nd bearing half one 60 ... near, turning indicator 47 ... be installed on the anterior cover 39, can improve by the 2nd bearing half one 60 ... supporting fulcrum 51 ... supporting rigidity.
Embodiments of the invention more than have been described, but the present invention is not limited to the foregoing description, in the scope that does not break away from claim, can carries out the change in the various designs.
For example, in the above-described embodiments, the 1st bearing half one 59 of the forebody of supporting fulcrum 51 is arranged on the anterior cover 39, but also can be arranged on latter half of the 1st bearing half one of supporting fulcrum 51 on the cover of rear portion, on the turning indicator that is installed on the anterior cover, the 2nd bearing half one of the forebody of this fulcrum 51 of supporting is set.

Claims (2)

1. two-wheeled headlight support structure, in two-wheeled, the handle cover (38) that covers handle (15) is by plastic anterior plastic rear portion cover (40) formation of covering (39) and covering handle (15) from rear side from front side covering handle (15), forwardly cover (39) go up to be installed head lamp (46) and can be regulated optical axis, install simultaneously be configured in head lamp (46) about a pair of turning indicator (47); It is characterized in that, cover a pair of the 1st bearing half one (59) on the side of (39,40) and be arranged on a pair of fulcrum (51) that a pair of the 2nd bearing half one (60) on aforementioned two turning indicators (47) clamps from front and back and can joltily be supported, outstanding coaxially being arranged on the left and right sides of head lamp (46) with being arranged on anterior cover and rear portion.
2. two-wheeled headlight support structure as claimed in claim 1, it is characterized in that, on the top of aforementioned approaches to indicator lamp (47), give prominence to with interconnecting be provided for these turning indicators (47) be installed on the anterior cover (39) installation portion (55) and with aforementioned the 2nd bearing half one (60) of this installation portion (55) adjacency.
CNB018235271A 2001-10-19 2001-10-19 Headlight support structure for motorcycle Expired - Lifetime CN1307075C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2001/009212 WO2003035456A1 (en) 2001-10-19 2001-10-19 Headlight support structure for motorcycles

Publications (2)

Publication Number Publication Date
CN1543412A true CN1543412A (en) 2004-11-03
CN1307075C CN1307075C (en) 2007-03-28

Family

ID=11737851

Family Applications (2)

Application Number Title Priority Date Filing Date
CNB018235271A Expired - Lifetime CN1307075C (en) 2001-10-19 2001-10-19 Headlight support structure for motorcycle
CNB018235263A Expired - Lifetime CN1288023C (en) 2001-10-19 2001-10-24 Rear combination lamp of motorcycle

Family Applications After (1)

Application Number Title Priority Date Filing Date
CNB018235263A Expired - Lifetime CN1288023C (en) 2001-10-19 2001-10-24 Rear combination lamp of motorcycle

Country Status (6)

Country Link
JP (1) JP3585921B2 (en)
KR (1) KR100539601B1 (en)
CN (2) CN1307075C (en)
BR (1) BR0117099B1 (en)
TW (1) TW526154B (en)
WO (1) WO2003035456A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100522728C (en) * 2005-10-31 2009-08-05 本田技研工业株式会社 Headlight supporting structure
CN108136955A (en) * 2016-01-21 2018-06-08 宝马股份公司 Single-wheel rut motor vehicle for the headlamp of single-wheel rut motor vehicle and with headlamp

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005041476A (en) * 2003-07-07 2005-02-17 Yamaha Motor Co Ltd Saddle-riding type vehicle
JP4458426B2 (en) * 2005-10-31 2010-04-28 本田技研工業株式会社 Winker mounting structure
JP2007269143A (en) * 2006-03-31 2007-10-18 Yamaha Motor Co Ltd Tail lamp device for vehicle and motorcycle furnished with tail lamp device
AU2008200865B2 (en) * 2007-03-30 2010-03-18 Honda Motor Co., Ltd. Motocycle front lighting apparatus structure
CN102490824B (en) * 2011-12-28 2013-07-10 力帆实业(集团)股份有限公司 Mounting structure of front illumination component for motorcycle
JP6370802B2 (en) 2012-12-28 2018-08-08 テイコク ファーマ ユーエスエー インコーポレーテッド Long-acting buprenorphine transdermal delivery composition and methods of use thereof
CN105358901B (en) * 2013-07-02 2018-05-01 本田技研工业株式会社 Vehicle lamp body
CN104340304B (en) * 2013-07-29 2017-09-19 本田技研工业株式会社 Two-wheeled rear combination lamp
WO2018070944A1 (en) * 2016-10-11 2018-04-19 Honda Motor Company Limited Headlight mounting structure for motorcycle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2547379Y2 (en) * 1990-09-26 1997-09-10 本田技研工業株式会社 Lighting device mounting structure for scooter vehicle
JP2526760Y2 (en) * 1990-12-29 1997-02-19 本田技研工業株式会社 Headlight support device
JP3375349B2 (en) * 1992-07-31 2003-02-10 ヤマハ発動機株式会社 Scooter handle cover
JP3460848B2 (en) * 1993-10-19 2003-10-27 ヤマハ発動機株式会社 Motorcycle headlight mounting structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100522728C (en) * 2005-10-31 2009-08-05 本田技研工业株式会社 Headlight supporting structure
CN108136955A (en) * 2016-01-21 2018-06-08 宝马股份公司 Single-wheel rut motor vehicle for the headlamp of single-wheel rut motor vehicle and with headlamp

Also Published As

Publication number Publication date
WO2003035456A1 (en) 2003-05-01
CN1288023C (en) 2006-12-06
KR20040035717A (en) 2004-04-29
CN1543413A (en) 2004-11-03
BR0117099B1 (en) 2010-06-01
TW526154B (en) 2003-04-01
KR100539601B1 (en) 2005-12-28
JPWO2003035456A1 (en) 2005-02-10
CN1307075C (en) 2007-03-28
BR0117099A (en) 2004-08-17
JP3585921B2 (en) 2004-11-10

Similar Documents

Publication Publication Date Title
US10745079B2 (en) Bicycle component control device
CN1543412A (en) Headlight support structure for motorcycle
CN101837808B (en) Motorcycle
JP7063987B2 (en) Saddle-type vehicle
CN103010362A (en) Electric vehicle
KR101911165B1 (en) Air-cleaner structure of saddle-ride type vehicle
US6675933B2 (en) Exhaust system for motorcycle
US10793214B1 (en) Headlight support structure of saddle riding vehicle
JPWO2021002404A5 (en)
CN1231382C (en) Headlight device on motor cycle
CN1660643B (en) Indicator lamp of motor bicycle
CN1520367A (en) Frame structure of motorcycle
CN1539676A (en) Combined lamps
CN1376609A (en) Pedal frame structure of rear seat of mopeds
EP3590804A1 (en) Straddled vehicle
CN101531225B (en) Rear lateral cover bearing structure of motor two-wheel vehicle
CN1718495A (en) Motorcycle
CN1709761A (en) Structure of motorcycle
CN1090119C (en) Small two-cycle motorcycle
JP3608369B2 (en) Rear combination lamp for motorcycle
US8011716B2 (en) Motorcycle with cantilevered front windshield
CN1091045C (en) Horn-mounting structure of motor-driven bicycle
CN1030902C (en) Sopporting structure for engine of motor-scooter
BR102021014101A2 (en) Headlight unit for a ride-on type motorcycle
CN2661534Y (en) Master cast of motorcycle frame

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CX01 Expiry of patent term

Granted publication date: 20070328

CX01 Expiry of patent term