CN201591716U - Permanent seat and fixed head and connection device for being used in matching way with permanent seat - Google Patents
Permanent seat and fixed head and connection device for being used in matching way with permanent seat Download PDFInfo
- Publication number
- CN201591716U CN201591716U CN2009202623478U CN200920262347U CN201591716U CN 201591716 U CN201591716 U CN 201591716U CN 2009202623478 U CN2009202623478 U CN 2009202623478U CN 200920262347 U CN200920262347 U CN 200920262347U CN 201591716 U CN201591716 U CN 201591716U
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- axle
- latch
- installing hole
- holder
- return unit
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- Expired - Lifetime
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Abstract
The utility model discloses a permanent seat and a fixed head and a connection device for being used in a matching way with the permanent seat, comprising a seat body, a fastening shaft, a trigger shaft, a trigger shaft resetting piece, a plug and a plug resetting piece, wherein the seat body is provided with a first installation hole, a second installation hole and a third installation hole; the second installation hole is provided with a first stopping wall; the fastening shaft is arranged in the second installation hole in a sliding way; the trigger shaft is linked with the fastening shaft; two ends of the trigger shaft resetting piece respectively prop against the trigger shaft and the first stopping wall; the plug is arranged in the third installation hole in the sliding way; the front end of the plug is provided with a locking part; and one end of the plug resetting piece is fixed and the other end thereof props against the plug. When in connection, by directly inserting the fixed head into the first installation hole, the fixed head can be locked on the permanent seat without other operations; and when in disassembly, by pulling out the plug and withdrawing the force on the plug, the fixed head can be pulled out, thus having convenient and simple connection and disassembly.
Description
Technical field
This utility model relates to a kind of quick disassembly mechanism and has the connecting device of this mechanism
Background technology
Operating-table product in the armarium generally has some needs the often part of dismounting, and as a plate and lower limb plate, these parts generally are connected by fast assembly and disassembly mechanism with operating-table.
Notification number is that CN2936225Y, date of declaration are that the Chinese patent that Augusts 22 in 2007, day, were called " a kind of connection locking device of operating-table " discloses a kind of fast assembling disassembling structure, it comprises holder, position fixing handle, fixing head, locating pin, steel ball, back-moving spring composition, the mode that this mechanism adopts position fixing handle to pull can make the partial dismantling that removably connects of operating-table, position fixing handle is pulled position, one side, locating pin is to sliding in the other direction, steel ball is fallen in the groove of locating pin, can extract fixing head; After inserting fixing head, unclamp position fixing handle, back-moving spring is pushed locating pin to rightabout, and the steel ball in the groove is ejected, and fixing head can be locked on the holder.But there is following shortcoming in this kind structure: all need a straight pull to live position fixing handle in the process of fixing head connection and dismounting, up to connecting and the unloading process end inconvenient operation.
The utility model content
The technical problems to be solved in the utility model is that holder, fixing head and the connecting device of a kind of connection and convenient disassembly is provided.
For solving the problems of the technologies described above, this utility model provides a kind of holder, comprise pedestal, the buckle axle, trigger axle, trigger the axle return unit, latch and latch return unit, described pedestal has first installing hole, second installing hole and the 3rd installing hole, described the 3rd installing hole and first, two installing holes all connect, described second installing hole has the first block wall, described buckle axle is slidingly arranged in described second installing hole, described triggering axle and described buckle axle interlock, described two ends of triggering the axle return unit compress the described triggering axle and the first block wall respectively, described latch is slidingly arranged in described the 3rd installing hole, described latch has lock-out state that is positioned on the buckle axle and the released state that breaks away from the buckle axle, the front end of described latch is provided with sticking department, described sticking department has the primary importance that stretches into first installing hole and the second position of retraction the 3rd installing hole, one end of described latch return unit is fixed, and the other end of described latch return unit compresses described latch.
Further, described holder also comprises buckle axle return unit, described second installing hole also has the second block wall, the two ends of described buckle axle return unit compress described second block wall and buckle axle respectively, described triggering axle pine is enclosed within on the described buckle axle, be fixed with on the described buckle axle and trigger the axle locating part, described triggering axle is between described triggering axle return unit and triggering axle locating part; Owing to trigger axle buckle axle motion relatively, behind the segment distance, could be with the buckle axle outwards to slide together so the triggering axle needs to slide from the process of outwards sliding in whole bulged-in positions.
Further, described latch has recessed draw-in groove, and described buckle axle has the fixture block of protrusion, and described latch is when lock-out state, and described fixture block inserts described draw-in groove; Latch is when released state, and described fixture block breaks away from described draw-in groove, by the cooperation of fixture block and draw-in groove, can latch outwards slide put in place after, realize locking to latch.
Further, described sticking department is a bullet; This bullet can cooperate with the lock slots of fixing head, realize the locking of fixing head in holder, and this bullet can also guarantee under fixing head locks onto situation in the holder, when fixing head is born bigger withdrawal force, fixing head can not break away from holder, can also latch be extracted from the lock slots of fixing head with less power simultaneously, thus the smooth dismounting of assurance fixing head.
Further, described holder also comprises buckle axle locating part, described pedestal also has the 4th installing hole, and described the 4th installing hole and described second installing hole connect, and described buckle axle locating part slides to be arranged in described the 4th installing hole and with described buckle axle and fixes; By buckle axle locating part is set, can prevent that the buckle axle from rotating in second installing hole, and can be on first direction the buckle axle is carried out certain spacing.
Further, described triggering axle return unit and buckle axle return unit all are enclosed within on the described buckle axle, and described latch return unit is enclosed within on the described latch.
A kind of fixing head of being used with holder of being used for, second pushing part that comprises first pushing part and be used to promote the triggering axle motion of described holder, described first pushing part is connected with the second pushing part one, described first pushing part has the work surface of the inclination of the latch motion that is used to promote described holder, and described first pushing part also has the lock slots with the sticking department coupling of described latch.
A kind of connecting device, comprise first connector, second connector, fixing head and holder, the pedestal of described first connector and described holder is fixed, described second connector and described fixing head are fixed, described pedestal has first pushing part and second pushing part, described first pushing part has lock slots and is used to promote the work surface of the latch motion of described holder, insert in first installing hole of described holder described first pushing part, described lock slots cooperates with the sticking department of holder, and described second pushing part is pressed on the described triggering axle.
Further, described first connector is the operation table main frame, and second connector is the operation head board.
Further, described sticking department is a bullet, and described work surface is the inclined-plane; By the work surface of taper lock bonding part and inclination is set, be convenient to being connected and dismounting of fixing head and holder.
The beneficial effects of the utility model are: during connection, first installing hole that directly fixing head is inserted holder gets final product, and does not need other operation fixing head can be locked on the holder; During dismounting, latch is extracted, is cancelled the power on the latch then, fixing head is extracted get final product, connect and disassembling section very convenient simply.
Description of drawings
Fig. 1 is the axonometric chart of present embodiment fast assembly and disassembly mechanism;
Fig. 2 is the three-dimensional exploded view of fast assembly and disassembly mechanism;
Fig. 3 is the axonometric chart of pedestal;
Fig. 4 is the front view of pedestal;
Fig. 5 is the cutaway view of Fig. 4 along the A-A direction;
Fig. 6 is the axonometric chart of buckle axle;
Fig. 7 is the front view of buckle axle;
Fig. 8 is the cutaway view of Fig. 7 along the B-B direction;
Fig. 9 is the axonometric chart of latch;
Figure 10 is the cutaway view that triggers axle;
Figure 11 is the axonometric chart of fixing head;
Figure 12 is the cutaway view of fast assembly and disassembly mechanism;
Figure 13 to Figure 16 is the structural representation of reflection holder and fixing head connection procedure;
Figure 17 and Figure 18 are the structural representations of reflection holder and fixing head unloading process;
Figure 19 is the axonometric chart of present embodiment connecting device;
Figure 20 is the axonometric chart that the operation table main frame of holder is housed;
Figure 21 is the axonometric chart that the operation head board of fixing head is housed.
The specific embodiment
In conjunction with the accompanying drawings this utility model is described in further detail below by the specific embodiment.
To shown in Figure 180, fast assembly and disassembly mechanism 39 comprises holder 1 and fixing head 12 as Fig. 1.Holder 1 comprises pedestal 19, buckle axle 3, buckle axle return unit 2, latch 4, latch return unit 5, triggers axle 9 and trigger axle return unit 8.
To shown in Figure 5, pedestal 19 has first installing hole 20 and second installing hole 21 that runs through at first direction as Fig. 3, and this first direction is the dismounting direction of fixing head 12.Second installing hole 21 can be the stepped hole of being made up of the multistage hole, and as the little stepped hole in big middle aperture, aperture, two ends, this second installing hole 21 has two block walls that formed by step, is respectively the first block wall 22 and the second block wall 23.Pedestal 19 also has the 3rd installing hole 24 and the 4th installing hole 25, the three installing holes 24 that extend in second direction and all connects with first and second installing hole 20,21, and the 4th installing hole 25 and second installing hole 21 connect.This first direction and second direction not in the same way and have angle, this first direction can be vertical with second direction, i.e. the 3rd installing hole 24 and first and second installing hole 20,21 vertical perforations, the 4th installing hole 25 and the 21 vertical perforations of second installing hole; Certainly, this first direction also can with the second direction out of plumb.In addition, first installing hole and second installing hole also can be blind hole; The axis of the 3rd installing hole and the 4th installing hole can be parallel, also can have the angle for acute angle.
Extremely shown in Figure 8 as Fig. 5, buckle axle 3 has less bar portion 31 of external diameter and the bigger head 32 of external diameter, this bar portion 31 and head 32 are wholely set, the end face of this bar portion 31 has upwardly extending first threaded connection hole 33 of axle at the buckle axle, second installing hole, 21 matched in clearance of this head 32 and pedestal 19, guarantee that buckle axle 3 can slide second installing hole 21 in, this head 32 is provided with that upwardly extending second threaded connection hole 34 reaches the fixture block 14 that outwards protrudes out in the footpath of buckle axle.
As shown in Figure 2, buckle axle return unit 2 is used to utilize elastic force to promote buckle axle 3, and this buckle axle return unit 2 can stretch on first direction, and this buckle axle return unit 2 is as stage clip.
As Fig. 5 and shown in Figure 9, the 3rd installing hole 24 matched in clearance of latch 4 and pedestal can guarantee that latch slides in the 3rd installing hole 24.Latch 4 has the taper lock bonding part 15 that is positioned at front end and is positioned at the annular slot 16 at these sticking department 15 rears.
As shown in Figure 2, latch return unit 5 is used to utilize elastic force to promote latch 4, and this latch return unit 5 can stretch on second direction, and this latch return unit 5 is as stage clip.
As Fig. 2, Fig. 9, Figure 10 and shown in Figure 17, trigger axle 9 and be used to receive the active force of fixing head 12 and promote buckle axle 3, this triggering axle 9 is the cylindrical body that axially runs through.Trigger axle return unit 8 and be used to utilize elastic force outwards to promote to trigger axle 9, trigger axle return unit 8 and can stretch on second direction, this triggers axle return unit such as stage clip.When fixing head 12 was extracted out from holder 1, it is outwards mobile that triggering axle return unit 8 promotes to trigger axle 9, triggers axle 9 and can be with buckle axle 3 to move together, and the fixture block 14 of buckle axle is withdrawed from from the draw-in groove 16 of latch.
Extremely shown in Figure 12 as Fig. 1, for holder, buckle axle 3 is packed in second installing hole 21 of pedestal 19, and buckle axle return unit 2 is enclosed within the bar portion 31 of buckle axle 3, and the two ends of this buckle axle return unit 2 compress the head 32 of buckle axle and the second block wall 23 of pedestal 19 respectively; Trigger axle return unit 8 and be enclosed within the bar portion 31 of this buckle axle, trigger axle 9 pines and be enclosed within the bar portion 31 of this buckle axle, the two ends of triggering axle return unit 8 compress the first block wall 22 that triggers axle 9 and pedestal 19 respectively; The end face of buckle axle portion 31 is equipped with ring-type catch 10, and first threaded connection hole 33 of bar end surface and triggering axle stop screw 11 threaded engagement trigger axle 9 and triggering between a return unit 8 and this catch 10; Buckle axle stop screw 13 passes the 4th installing hole 25 of pedestal and is threaded with second threaded connection hole 34 of buckle axle 3, thereby can prevent that buckle axle 3 from rotating in second installing hole 21, also have simultaneously necessarily for the spacing effect of first direction, and this buckle axle stop screw 13 can move along first direction in the 4th installing hole 25; Latch 4 is packed in the 3rd installing hole 24, and latch return unit 5 is enclosed within on this latch 4, and the two ends of latch return unit 5 compress latch return unit pressing plate 6 and latch 4 respectively, and latch return unit pressing plate 6 is fixed on the outside of pedestal the 3rd installing hole 24 by pressing plate trip bolt 7.
As Fig. 2, Fig. 3 and shown in Figure 11, fixing head 12 comprises cylindrical first pushing part 35 and block second pushing part 36 that is wholely set, first installing hole, 20 couplings of this first pushing part 35 and pedestal 19, this first pushing part 35 has the lock slots 18 with sticking department 15 coupling of latch, the front end of this first pushing part 35 has work surface 17, this work surface 17 is used for making when fixing head 12 is packed holder 1 into latch 4 outwards to withdraw from the 3rd installing hole 24, guarantee fixing head 12 holder 1 of can packing into smoothly, second pushing part 36 is used for promoting to trigger axle 9 when fixing head 12 is packed holder 1 fully into, make and trigger axle 6 and catch 10 disengagings, buckle axle 3 withstands on the latch 4 under the effect of buckle axle return unit 2.This work surface 17 can be the inclined-plane, as the tapered plane or the conical surface; Perhaps other can play the surface that presses down the latch effect.
The disassembly process of mounting mechanism is as follows fast: the state of mechanism as shown in figure 13 before connecting, fixing head 12 is inserted in first installing hole 20 of holder 1, when fixing head 12 moves to a certain position, the work surface 17 of first pushing part, 35 front ends and the sticking department 15 of latch 4 contact, as shown in figure 14; Continue inwardly to promote fixing head, latch 4 begin outwards to move under the effect of fixing head work surface 17, and when second pushing part 36 of fixing head touches when triggering spools 9, the sticking department 15 of latch 4 has withstood on the face of cylinder of first pushing part 35, as shown in figure 15; Continue inwardly to promote fixing head, when the lock slots on the fixing head 18 arrives sticking department 15 positions of latch, under the resilient force of latch return unit 5, sticking department 15 inserts in the lock slots 18, realize the locking of fixing head, trigger axle 9 simultaneously and be pressed into fully in second installing hole 21, trigger axle 9 and break away from catch 10, buckle axle 3 withstands on the latch 4, as shown in figure 16 under the effect of buckle axle return unit 2.So far, connection procedure finishes.
The state of mechanism as shown in figure 16 before the dismounting, pull out latch 4, when the annular slot on the latch 4 16 arrives the fixture block 14 of buckle axle, fixture block 14 snaps in this annular slot 16 under the resilient force of buckle axle return unit, latch 4 is fixed on second direction, and the sticking department 15 of latch breaks away from the lock slots 18 of fixing head, spacing be disengaged of fixing head 12 this moment on first direction, can outwards extract, as shown in figure 17; Cancel the external force that acts on the latch, extract fixing head outward, triggering axle 9 outwards moves with fixing head 12 under the effect that triggers axle return unit 8, when fixing head 12 moves to a certain position, triggering axle 9 beginnings contacts with catch 10, this moment, latch 4 still was positioned on second direction, the lock slots 18 on the fixing head with latch 4 certain position of having staggered, as shown in figure 18; Continue to extract outward fixing head, separate fully with holder to fixing head, triggering axle 9 drive buckle axles 3 moves together, the fixture block of buckle axle withdraws from from the draw-in groove of latch, latch is disengaged the spacing of second direction, and latch stretches under the effect of latch return unit in first installing hole 20, as shown in figure 13 again, so far, unloading process finishes.
For holder, active force when the triggering axle is used to receive the fixing head insertion also promotes the buckle axle, this triggers axle and the interlock of buckle axle, the implementation of this interlock can be that triggering axle and buckle axle are fixed, can only be provided with this moment and trigger axle return unit and latch return unit, realize buckle axle and the locking and unlocking of latch and the locking and unlocking of latch and fixing head; The another kind of implementation of this interlock is to trigger axle buckle axle slip relatively, makes to trigger axle from the process of outwards sliding in the position that is pressed into fully in second installing hole, behind the segment distance that need slide, could be with the buckle axle to move together.
Extremely shown in Figure 21 as Figure 19, a kind of connecting device comprises first connector, second connector and aforesaid fast assembly and disassembly mechanism 39, fast assembly and disassembly mechanism comprises that holder 1 and fixing head 12, the first connectors and holder 1 are fixing, and second connector and fixing head 12 are fixing.This first connector can be operation table main frame 37, and this second connector can be operation table head plate 38.During installation, operation head board 38 is aimed at first installing hole 20 on two holders 1 respectively with the fixing head 12 of two fast assembly and disassembly mechanisms 39, the operation head board pushed in to realize performing the operation head board fixing on the operation table main frame, at this moment, the operation head board can not rotate relative to the operation table main frame, can not translation.When needing dismounting operation head board, earlier with the latch of two holders toward drop-down, be stuck up to latch, the head board of will performing the operation is then pulled out the dismounting of the head board of can realizing performing the operation.Certainly, first and second connector also can need be realized the structure of connection fast and dismounting for other.
Above content be in conjunction with concrete embodiment to further describing that this utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For this utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from this utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (10)
1. holder, it is characterized in that: comprise pedestal, the buckle axle, trigger axle, trigger the axle return unit, latch and latch return unit, described pedestal has first installing hole, second installing hole and the 3rd installing hole, described the 3rd installing hole and first, two installing holes all connect, described second installing hole has the first block wall, described buckle axle is slidingly arranged in described second installing hole, described triggering axle and described buckle axle interlock, described two ends of triggering the axle return unit compress the described triggering axle and the first block wall respectively, described latch is slidingly arranged in described the 3rd installing hole, described latch has lock-out state that is positioned on the buckle axle and the released state that breaks away from the buckle axle, the front end of described latch is provided with sticking department, described sticking department has the primary importance that stretches into first installing hole and the second position of retraction the 3rd installing hole, one end of described latch return unit is fixed, and the other end of described latch return unit compresses described latch.
2. holder as claimed in claim 1, it is characterized in that: also comprise buckle axle return unit, described second installing hole also has the second block wall, the two ends of described buckle axle return unit compress described second block wall and buckle axle respectively, described triggering axle pine is enclosed within on the described buckle axle, be fixed with on the described buckle axle and trigger the axle locating part, described triggering axle is between described triggering axle return unit and triggering axle locating part.
3. holder as claimed in claim 2 is characterized in that: described latch has recessed draw-in groove, and described buckle axle has the fixture block of protrusion, and described latch is when lock-out state, and described fixture block inserts described draw-in groove; Latch is when released state, and described fixture block breaks away from described draw-in groove.
4. holder as claimed in claim 3 is characterized in that: described sticking department is a bullet.
5. holder as claimed in claim 4, it is characterized in that: also comprise buckle axle locating part, described pedestal also has the 4th installing hole, and described the 4th installing hole and described second installing hole connect, and described buckle axle locating part slides to be arranged in described the 4th installing hole and with described buckle axle and fixes.
6. holder as claimed in claim 2 is characterized in that: described triggering axle return unit and buckle axle return unit all are enclosed within on the described buckle axle, and described latch return unit is enclosed within on the described latch.
7. one kind is used for the fixing head that is used with holder, it is characterized in that: second pushing part that comprises first pushing part and be used to promote the triggering axle motion of described holder, described first pushing part is connected with the second pushing part one, described first pushing part has the work surface of the inclination of the latch motion that is used to promote described holder, and described first pushing part also has the lock slots with the sticking department coupling of described latch.
8. connecting device, comprise first connector and second connector, it is characterized in that: comprise that also fixing head reaches as any described holder among the claim 1-6, the pedestal of described first connector and described holder is fixed, described second connector and described fixing head are fixed, described pedestal has first pushing part and second pushing part, described first pushing part has lock slots and is used to promote the work surface of the latch motion of described holder, insert in first installing hole of described holder described first pushing part, described lock slots cooperates with the sticking department of holder, and described second pushing part is pressed on the described triggering axle.
9. connecting device as claimed in claim 8 is characterized in that: described first connector is the operation table main frame, and second connector is the operation head board.
10. connecting device as claimed in claim 9 is characterized in that: described sticking department is a bullet, and described work surface is the inclined-plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202623478U CN201591716U (en) | 2009-12-30 | 2009-12-30 | Permanent seat and fixed head and connection device for being used in matching way with permanent seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202623478U CN201591716U (en) | 2009-12-30 | 2009-12-30 | Permanent seat and fixed head and connection device for being used in matching way with permanent seat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201591716U true CN201591716U (en) | 2010-09-29 |
Family
ID=42773778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202623478U Expired - Lifetime CN201591716U (en) | 2009-12-30 | 2009-12-30 | Permanent seat and fixed head and connection device for being used in matching way with permanent seat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201591716U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105649279A (en) * | 2016-01-13 | 2016-06-08 | 杭州杰晟宝建筑围护***有限公司 | Fixing base, metal roof system with fixed base and installing method of metal roof system |
| CN108316511A (en) * | 2018-04-19 | 2018-07-24 | 湖北沛函建设有限公司 | A kind of assembled wall connecting mechanism |
| CN109798291A (en) * | 2019-03-21 | 2019-05-24 | 北京首航科学技术开发有限公司 | A kind of fast assembling-disassembling bolt |
| CN110022833A (en) * | 2016-11-28 | 2019-07-16 | 迈柯唯有限公司 | Patient lying area module with locking device |
| CN110496341A (en) * | 2019-08-28 | 2019-11-26 | 晋江市长胜电子科技有限公司 | Miniature fire station |
| CN110547758A (en) * | 2019-10-05 | 2019-12-10 | 扬州市君瑞企业管理有限公司 | Medical optometry support |
| CN113281096A (en) * | 2021-07-02 | 2021-08-20 | 浙江安防职业技术学院 | Drilling and coring equipment for traffic pavement quality detection |
-
2009
- 2009-12-30 CN CN2009202623478U patent/CN201591716U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105649279A (en) * | 2016-01-13 | 2016-06-08 | 杭州杰晟宝建筑围护***有限公司 | Fixing base, metal roof system with fixed base and installing method of metal roof system |
| CN110022833A (en) * | 2016-11-28 | 2019-07-16 | 迈柯唯有限公司 | Patient lying area module with locking device |
| CN110022833B (en) * | 2016-11-28 | 2022-02-22 | 迈柯唯有限公司 | Patient support surface module with locking device |
| CN108316511A (en) * | 2018-04-19 | 2018-07-24 | 湖北沛函建设有限公司 | A kind of assembled wall connecting mechanism |
| CN109798291A (en) * | 2019-03-21 | 2019-05-24 | 北京首航科学技术开发有限公司 | A kind of fast assembling-disassembling bolt |
| CN109798291B (en) * | 2019-03-21 | 2023-10-31 | 北京首航科学技术开发有限公司 | Quick assembly disassembly bolt |
| CN110496341A (en) * | 2019-08-28 | 2019-11-26 | 晋江市长胜电子科技有限公司 | Miniature fire station |
| CN110547758A (en) * | 2019-10-05 | 2019-12-10 | 扬州市君瑞企业管理有限公司 | Medical optometry support |
| CN113281096A (en) * | 2021-07-02 | 2021-08-20 | 浙江安防职业技术学院 | Drilling and coring equipment for traffic pavement quality detection |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100929 |
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| CX01 | Expiry of patent term |