CN203536250U - Closable cover opening power-off structure of breaker - Google Patents
Closable cover opening power-off structure of breaker Download PDFInfo
- Publication number
- CN203536250U CN203536250U CN201320744869.8U CN201320744869U CN203536250U CN 203536250 U CN203536250 U CN 203536250U CN 201320744869 U CN201320744869 U CN 201320744869U CN 203536250 U CN203536250 U CN 203536250U
- Authority
- CN
- China
- Prior art keywords
- circuit breaker
- pull lever
- head
- projection
- pull
- 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.)
- Expired - Lifetime
Links
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000000994 depressogenic effect Effects 0.000 description 3
- 230000000881 depressing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Landscapes
- Breakers (AREA)
Abstract
The utility model discloses a closable cover opening power-off structure of a breaker. The structure comprises a breaker middle cover (1), a draw bar (2), a pulling rod (4), and an attachment cover (7). The breaker middle cover (1) is provided with a mounting hole and can be installed on a breaker body. The draw bar (2) is rotatably disposed and can be linked with a tripping mechanism of the breaker. The draw bar is provided with a lug (3). The pulling rod (4) is scalable through an elastic component (5) and is disposed through the mounting hole. An end of the pulling rod facing the lug is provided with a pulling head (6). The pulling rod can rotate in the mounting hole, so that the pulling head contacts with the lug, the draw bar is driven to rotate when returning, and rotation reset of the draw bar is limited after returning, or the pulling head (6) is separated from the lug (3). The attachment cover (7) is disposed on the breaker middle cover (1) and presses down and rotates the pulling rod so that the pulling head contacts or separates from the lug, and open and close of a cover opening power-off function of the breaker can be realized.
Description
Technical field
The utility model relates to breaker technical field, particularly, relates to a kind of closable uncovering power-off structure of circuit breaker.
Background technology
Conventionally, in low pressure distribution plant, Inturruptor for sub-line used, residual current circuit breaker etc. can be by user's lids that opens the attachment voluntarily, so that the contents such as auxiliary contact, Alarm contactor, shunt release and device for under-voltage releasing equipment to be installed on breaker body.
But, due to the self structure restriction of existing circuit breaker, when user opens circuit breaker accessory lid voluntarily, the state of circuit breaker can not changed, the separating brake that still can normally close a floodgate is detained operation again, thereby cannot guarantee that user's circuit breaker when dismounting contents disconnects.And under closing of power circuit breaker state, easily damage contents during dismounting contents, and make user that electric shock accidents occur, thereby there is certain potential safety hazard, therefore, for safety factor, open the attachment in some cases while covering, need to make circuit breaker in off-position.But in some cases,, opening the inner additional hours of circuit breaker accessory lid dismounting, need to make circuit breaker still to remain on "on" position, and existing circuit breaker all cannot meet the selectable this requirement of uncovering power-off defencive function well.
Utility model content
Problem to be solved in the utility model is user in the attachment head of opening circuit breaker during with dismounting annex, circuit-breaker status is still in on-state, thereby there is the technical problem of potential safety hazard, thereby provide a kind of simple in structure, easy for installation, the lid that opens the attachment can make circuit breaker power-off, and can close the closable uncovering power-off structure of circuit breaker of uncovering power-off function.
To achieve these goals, the utility model provides a kind of closable uncovering power-off structure of circuit breaker, comprises circuit breaker middle cover, is provided with installing hole and can be arranged on breaker body; Draw bar, rotates and arranges and can link with the tripping mechanism of circuit breaker, and draw bar has projection; Pull lever, scalable and run through and be arranged in installing hole by elastic component, pull lever has towards the end of projection the head of pulling, pull lever can be rotated in installing hole, so that pull head and bump contact, to drive when the return draw bar to rotate, and after return, limit draw bar and rotate and reset, or so that pull head and projection to depart from; Attachment head, is arranged in circuit breaker and covers, and depresses pull lever.
Described installing hole inside is formed with stop part; One end of described pull lever is shaped to flange-type head, described in the other end is removably connected with, pulls head, and described elastic component is sleeved in described pull lever and between flange-type head and described stop part.
The perforated wall place of described installing hole is formed with rotary spacing deep-slotted chip breaker, is formed with and is rotatably engaged in described rotary spacing deep-slotted chip breaker and the protuberance extending radially outwardly from pull lever in described pull lever.
The radian of described rotary spacing deep-slotted chip breaker equal pull lever make pull head with projection from touching the rotational angle of disengaging.
The end face that described pull lever is stretched out the end of circuit breaker middle cover is provided with indicating grooves arrow, indicating grooves arrow towards identical with the bearing of trend of described protuberance.
In described attachment head, form with pull head and during bump contact corresponding uncovering power-off function open cue mark, and close cue mark with pulling uncovering power-off function corresponding while departing from projection.
The bottom surface of the projection of described draw bar is the inclined-plane that is inclined upwardly and extends, and pulls head to contact with this inclined-plane.
The middle part of described projection is formed with the U-shaped groove that runs through this projection, and described pull lever is through U-shaped groove.
The described outline that pulls an outline to be greater than described pull lever, with the junction at both, be formed with boss, pull head can pass described U-shaped groove, while contacting with the bottom surface of projection to turn to boss in pull lever, pull lever return can drive draw bar to rotate, or while staggering in the bottom surface that pull lever forwards boss and projection to, pull lever return can make to pull head directly through U-shaped groove.
Described draw bar is arranged on circuit breaker middle cover or breaker body rotationally.
Technique scheme of the present utility model compared with prior art, has the following advantages:
Circuit breaker uncovering power-off structure of the present utility model, its be arranged on breaker body in cover and be provided with installing hole, scalable running through of pull lever is arranged in installing hole, pull lever has towards the end of draw bar the head of pulling, pull lever can be rotated in installing hole, so that pull head with draw bar on bump contact, to drive when the return draw bar to rotate, and after return, limit draw bar and rotate reset, or so that pull head and projection to depart from, and attachment head is arranged in circuit breaker and covers, and depress pull lever, because attachment head is pushed down pull lever, make elastic component in compressive state, pull head not with bump contact, now, circuit breaker can normally carry out switching operation.While covering when opening the attachment, pull lever will eject under the effect of elastic component, pulls head will contact boss, and drive draw bar to rotate, thereby the tripping mechanism of circuit breaker is threaded off, make circuit breaker in trip status, simultaneously, after pull lever return, pull head also to contact on projection, to limit draw bar, rotate reset, before covering attachment head, circuit breaker will be always in trip status, thereby guarantees the personal safety of related personnel when dismounting contents; And when pulling head to depart from projection, now, open additional cap, pull lever is upspring and is not also driven draw bar to rotate, and changes annex, to realize the unlatching of circuit breaker uncovering power-off function or to close thereby meet under breaker electrifying state.
Circuit breaker uncovering power-off structure of the present utility model, the bottom surface with the projection that pulls head to contact of its draw bar is the inclined-plane that is inclined upwardly and extends, like this, pull head more easily in this ramped bottom surface, to slide, to drive draw bar to rotate, meanwhile, after pull lever return, more easily make the front end of projection contact with pulling the outline of head, thereby restriction draw bar rotate reset.
Accompanying drawing explanation
For the content of utility model is more easily expressly understood, below in conjunction with accompanying drawing, the utility model is described in further detail, wherein,
Fig. 1 represents the sectional block diagram of the closable uncovering power-off structure of the circuit breaker that the utility model embodiment provides;
Fig. 2 represents the three-dimensional structure diagram that pulls head and the bump contact of traction piece of pull lever of the closable uncovering power-off structure of circuit breaker;
Fig. 3 represents the three-dimensional structure diagram contacting with draw bar after the pull lever return of closable uncovering power-off structure of circuit breaker;
Fig. 4 represents the three-dimensional structure diagram that pulls head and the projection disengaging of traction piece of pull lever of the closable uncovering power-off structure of circuit breaker;
Fig. 5 represents the three-dimensional structure diagram of the rotary spacing deep-slotted chip breaker on installing hole;
Fig. 6 represents the structure chart of the cue mark that the uncovering power-off function in attachment head opens and closes;
Fig. 7 represents the three-dimensional structure diagram of pull lever of the closable uncovering power-off structure of circuit breaker.
Description of reference numerals
1-circuit breaker middle cover, 2-draw bar, 3-projection, 4-pull lever, 5-elastic component, 6-pulls head, 7-attachment head, 8-flange-type head, 9-U type groove, 10-installing hole, 11-rotary spacing deep-slotted chip breaker, 12-protuberance, 13-boss, 14-indicating grooves arrow, the bottom surface of 31-projection.
Embodiment
Below in conjunction with accompanying drawing, describe the closable uncovering power-off structure of the circuit breaker that embodiment of the present utility model provides in detail.
As shown in Figure 1,2 and 3, the closable uncovering power-off structure of described circuit breaker comprises circuit breaker middle cover 1, draw bar 2, pull lever 4 and attachment head 7, wherein,
Circuit breaker middle cover 1 is provided with installing hole 10, and circuit breaker middle cover 1 can be arranged on breaker body; Draw bar 2 rotates and arranges and can link with the tripping mechanism of circuit breaker, can drive the tripping mechanism of circuit breaker to thread off when draw bar 2 rotates, and has projection 3 on draw bar 2; Pull lever 4 is scalable and run through and be arranged in installing hole 10 by elastic component 5, pull lever 4 has towards the end of projection and pulls 6, pull lever 4 can be rotated in installing hole, so that pull 6 can contact with projection 3, to drive when the return draw bar 2 to rotate, and after return, limit draw bar 2 and rotate and reset, or so that pull 6 to depart from projection 3, not drive draw bar to rotate when the return; Attachment head 7 is arranged on circuit breaker middle cover 1, and depresses pull lever 4, after attachment head 7 is arranged on circuit breaker middle cover 1, will depress pull lever 4, makes elastic component (5) 5 in compressive state simultaneously.
Like this, consider safe factor, when circuit breaker needs uncovering power-off function, circuit breaker uncovering power-off structure of the present utility model can be arranged on circuit breaker.When attachment head is not opened, pull head not with bump contact, now, circuit breaker can carry out normal divide-shut brake and detain operation again, and while covering when opening the attachment, pull lever will pop up under the effect at elastic component 5, pull head with bump contact simultaneously and drive draw bar to rotate, making circuit breaker tripping, after pull lever return, projection is pulling conflict on head, now, while not depressing pull lever, pull head will stop that draw bar rotates reset, thereby make circuit breaker in trip status, guarantee related personnel's personal safety.And in the situation that not needing uncovering power-off function, rotate pull lever 4, make to pull head and projection to depart from, now, the lid that opens the attachment, pull lever will be upspring under the effect of elastic component, and do not drive draw bar to rotate, thereby realize the opening and closing of uncovering power-off function.
Further, described installing hole 10 inside are formed with stop part; One end of described pull lever 4 is shaped to flange-type head 8, described in being removably connected with, the other end pulls 6, described elastic component 5, for example spring housing is contained in described pull lever 4 and between flange-type head 8 and described stop part, conflict on dome type head 8 in the one end that is spring, the other end is conflicted on described stop part, thereby pull lever is telescopically arranged in installing hole.
As shown in Figure 5, the perforated wall place of described installing hole 10 is formed with rotary spacing deep-slotted chip breaker 11, in described pull lever 4, be formed with and be rotatably engaged in described rotary spacing deep-slotted chip breaker 11 and from pull lever 4 to outward extending protuberance 12, like this, protuberance 12 is engaged in deep-slotted chip breaker 11, and being limited by deep-slotted chip breaker 11 when rotating, thereby spacing when realizing pull lever 4 and rotating.
Further, the radian of described rotary spacing deep-slotted chip breaker 11 equal pull lever 4 make pull 6 with projection 3 from touching the rotational angle of disengaging, while pulling 6 to contact with projection 3, protuberance 12 contacts with a side of deep-slotted chip breaker 11, and when pulling 6 to depart from projection 3,12 of protuberances rotate and also contact with another side of deep-slotted chip breaker 11, like this, the radian of deep-slotted chip breaker 11 is identical with the rotational angle of pull lever 4, to realize location accurately.
In addition, as shown in Figures 6 and 7, the end face that pull lever 4 is stretched out the end of circuit breaker middle cover 1 is provided with indicating grooves arrow 14, indicating grooves arrow 14 towards identical with the bearing of trend of described protuberance 12, like this, when needs switch uncovering power-off function, user only need use straight screwdriver to rotate pull lever, thereby easily and accurately realizes the switching of uncovering power-off function.
Further, as shown in Figure 6, in attachment head 7, form a uncovering power-off function corresponding when pulling 6 to contact with projection 3 and open cue mark " ON ", and corresponding uncovering power-off function is closed cue mark " OFF " when pulling 6 to depart from projection 3, like this, by indicating grooves arrow 14, can realize accurately the open and close of the uncovering power-off function of circuit breaker.
In addition, as shown in Figure 3, the inclined-plane of the bottom surface of the projection 3 of described draw bar 2 31 for being inclined upwardly and extending, pulls 6 to contact with this inclined-plane.Like this, pull 6 will with this inclined-plane sliding contact, thereby when pull lever pops up, can more easily on the bottom surface 31 of this inclination, slide so that the front end of projection 3 conflicts at an outer surface that pulls 6, thereby restriction draw bar 2 rotates and resets.
Further, as shown in Figures 2 and 4, the middle part of described projection 3 is formed with the U-shaped groove 9 that runs through this projection, and described pull lever 4 is engaged in U-shaped groove 9, like this, pulls head to coordinate with this U-shaped groove 9, to realize both stable sliding contacts.
Further, as Fig. 2, shown in 4 and 7, the described outline that pulls 6 outline to be greater than described pull lever 4, with the junction at both, be formed with boss 13, pull 6 can pass described U-shaped groove 9, while contacting with the bottom surface of projection 3 to turn to boss 13 in pull lever 4, pull lever 4 returns can drive draw bar 2 to rotate, or in pull lever 4, forwarding boss 13 and the bottom surface of projection 3 to staggers while mutually departing from, pull lever 4 returns can make to pull 6 directly through U-shaped groove 9, and do not drive draw bar 2 to rotate, thereby realize the opening and closing of the uncovering power-off function of circuit breaker.
In addition, draw bar 2 is arranged on circuit breaker middle cover 1 or breaker body rotationally.
At this; those skilled in the art it will be appreciated that; under the enlightenment of said structure; protection range of the present utility model is not limited to the combination that pulls head and the projection of draw bar of pull lever; as long as can realize pull lever rotates; make to pull head and bump contact or disengaging; and when pulling head with bump contact; open the attachment after lid; pull lever can drive draw bar to rotate; make the function of circuit breaker tripping, and the structure that can realize such function all belongs to protection range of the present utility model.
The course of work below in conjunction with this circuit breaker uncovering power-off structure of Fig. 1-4 explanation:
Assembling mode: by this uncovering power-off Standard on circuit breaker time, first elastic component 5 is sleeved in pull lever, pull lever is arranged in the installing hole of circuit breaker middle cover, circuit breaker middle cover is covered on breaker body, draw bar is rotated (in the interface shown in Fig. 3, draw bar 2 clockwise rotates), so that the first speed that pulls of pull lever is lived draw bar 2 resets, now, circuit breaker cannot fasten lock again, covers subsequently attachment head again, and attachment head will be depressed pull lever, now, draw bar is by return.
Operating principle: when circuit breaker needs uncovering power-off, rotate pull lever, make to pull head and bump contact (boss pulling contacts with the bottom surface of the U-shaped groove on projection), because attachment head is pushed down pull lever, make the head that pulls of pull lever be positioned at the below of projection, now, the normal divide-shut brake of circuit breaker.After the lid that opens the attachment, pull lever will pop up under the effect of elastic component, because the head that pulls of pull lever contacts with the bottom surface of the projection of draw bar, make progress elasticity drive draw bar to rotate of pull lever, draw bar rotates and drives circuit breaker tripping, as shown in Figure 3, after pull lever return, the front end of projection is pulling on the outer surface of head conflicting, like this, and before pull lever is not depressed again, pull head will withstand projection, make draw bar cannot rotate reset, now, circuit breaker cannot fasten lock again.After attachment head covers again, pull lever will be depressed, and now, draw bar just rotatably resets.
When circuit breaker need to keep "on" position opening the attachment while covering, be that circuit breaker is not while needing uncovering power-off function, rotate pull lever, make to pull head and projection to depart from (pulling head can pass through U-shaped groove when pull lever return), now, lid opens the attachment, pull lever will pop up return under the effect of elastic component, due to pull head not with bump contact (pulling head directly through the U-shaped groove on projection), draw bar will not rotate, can not drive the tripping mechanism of circuit breaker to thread off, thereby make circuit breaker keep "on" position.
Obviously, above-described embodiment is only for example is clearly described, not the restriction to execution mode.Concerning those of ordinary skill in the field, also can make other changes in different forms on the basis of the above description.Here exhaustive without also giving all execution modes.And among the protection range that the apparent variation of being extended out thus or change are still created in the utility model.
Claims (10)
1. a closable uncovering power-off structure for circuit breaker, is characterized in that, comprises
Circuit breaker middle cover (1), is provided with installing hole (10) and can be arranged on breaker body;
Draw bar (2), rotates and arranges and can link with the tripping mechanism of circuit breaker, and draw bar (2) has projection (3);
Pull lever (4), scalable and run through and be arranged in installing hole by elastic component (5), pull lever (4) towards the end of projection, have pull head (6), pull lever (4) can be rotated in installing hole, so that pull head (6) to contact with projection (3), to drive when the return draw bar (2) to rotate, and after return, limit draw bar (2) and rotate and reset, or so that pull head (6) and projection (3) to depart from;
Attachment head (7), is arranged on circuit breaker middle cover (1) upper, and depresses pull lever (4).
2. the closable uncovering power-off structure of circuit breaker according to claim 1, is characterized in that, described installing hole inside is formed with stop part;
One end of described pull lever (4) is shaped to flange-type head (8), pulls head (6) described in the other end is removably connected with, and described elastic component (5) is sleeved on described pull lever (4) and goes up and be positioned between flange-type head (8) and described stop part.
3. the closable uncovering power-off structure of circuit breaker according to claim 1, it is characterized in that, the perforated wall place of described installing hole (10) is formed with rotary spacing deep-slotted chip breaker (11), is formed with the protuberance (12) that is rotatably engaged in described rotary spacing deep-slotted chip breaker (11) and extends radially outwardly from pull lever (4) in described pull lever (4).
4. the closable uncovering power-off structure of circuit breaker according to claim 3, is characterized in that, the radian of described rotary spacing deep-slotted chip breaker (11) equal pull lever (4) make pull head (6) and projection (3) from touching the rotational angle of disengaging.
5. the closable uncovering power-off structure of circuit breaker according to claim 3, it is characterized in that, the end face that pull lever (4) is stretched out the end of circuit breaker middle cover (1) is provided with indicating grooves arrow (14), indicating grooves arrow (14) towards identical with the bearing of trend of described protuberance (12).
6. the closable uncovering power-off structure of circuit breaker according to claim 5, it is characterized in that, in attachment head (7), form and pull head (6) corresponding uncovering power-off function unlatching cue mark while contact with projection (3), and corresponding uncovering power-off function is closed cue mark when pulling (6) to depart from projection (3).
7. according to the closable uncovering power-off structure of the circuit breaker described in claim 1-6 any one, it is characterized in that the inclined-plane of the bottom surface (31) of the projection (3) of described draw bar (2) for being inclined upwardly and extending pulls head (6) to contact with this inclined-plane.
8. the closable uncovering power-off structure of circuit breaker according to claim 7, is characterized in that, the middle part of described projection (3) is formed with the U-shaped groove (9) that runs through this projection, and described pull lever (4) is through U-shaped groove (9).
9. the closable uncovering power-off structure of circuit breaker according to claim 8, it is characterized in that, the described outline that pulls head (6) outline to be greater than described pull lever (4), with the junction at both, be formed with boss (13), pull head (6) can pass described U-shaped groove (9), while contacting with the bottom surface of projection (3) to turn to boss (13) in pull lever (4), pull lever (4) return can drive draw bar (2) to rotate, or while staggering in the bottom surface that pull lever (4) forwards boss (13) and projection (3) to, pull lever (4) return can make to pull head (6) directly through U-shaped groove (9).
10. the closable uncovering power-off structure of circuit breaker according to claim 1, is characterized in that, draw bar (2) is arranged on circuit breaker middle cover (1) or breaker body rotationally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320744869.8U CN203536250U (en) | 2013-11-21 | 2013-11-21 | Closable cover opening power-off structure of breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320744869.8U CN203536250U (en) | 2013-11-21 | 2013-11-21 | Closable cover opening power-off structure of breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203536250U true CN203536250U (en) | 2014-04-09 |
Family
ID=50422431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320744869.8U Expired - Lifetime CN203536250U (en) | 2013-11-21 | 2013-11-21 | Closable cover opening power-off structure of breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203536250U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107240534A (en) * | 2017-08-15 | 2017-10-10 | 德力西电气有限公司 | A kind of breaker is uncapped protection mechanism and breaker |
-
2013
- 2013-11-21 CN CN201320744869.8U patent/CN203536250U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107240534A (en) * | 2017-08-15 | 2017-10-10 | 德力西电气有限公司 | A kind of breaker is uncapped protection mechanism and breaker |
| CN107240534B (en) * | 2017-08-15 | 2020-01-14 | 德力西电气有限公司 | Circuit breaker uncovering protection mechanism and circuit breaker |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105702535A (en) | Residual-current circuit breaker | |
| CN203536250U (en) | Closable cover opening power-off structure of breaker | |
| CN203536251U (en) | Cover opening power-off structure of breaker | |
| CN205881839U (en) | Heavy switching -on device of circuit breaker | |
| CN201204165Y (en) | Plastic case circuit breaker | |
| CN205452204U (en) | Electric leakage circuit breaker with contact is instructed to thread off with electric leakage and is instructed | |
| CN106328456B (en) | Disengaging deivce of earth leakage and leakage circuit breakers comprising the disengaging deivce of earth leakage | |
| CN103594292B (en) | With the knob switch electrical equipment of dropout type instruction | |
| CN203707046U (en) | Internal locking module of breaker | |
| US3016431A (en) | Explosion proof enclosure for motor starters and circuit breakers | |
| CN103337386B (en) | Large output angle spring operating mechanism | |
| JP6072998B1 (en) | Control center | |
| CN207353179U (en) | A kind of transmission device for controlling protection switch | |
| CN202796594U (en) | Improved control and protection switching electric appliance (CPS) | |
| US10804053B2 (en) | Circuit breaker handle connection structure | |
| CN2696105Y (en) | Plastic casing circuit breaker capable of assembling with multiple attachment | |
| CN207250445U (en) | A kind of omnipotent breaker | |
| CN111224331B (en) | Switch board access hole protection device | |
| CN202796781U (en) | Breaker clamshell anti-electric shock structure | |
| CN205211679U (en) | Operating mechanism of disconnector | |
| CN207338281U (en) | A kind of miniature circuit breaker | |
| CN207489712U (en) | Spring formula current conversion station high-voltage switch gear convergence control cabinet emergency opening button mistaken collision preventing mechanism | |
| CN105529223A (en) | Electric operating mechanism capable of limiting switch in opening/closing position | |
| CN203882926U (en) | Internal accessory transmission device for circuit breakers | |
| CN205206566U (en) | Fire control linkage door closer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140409 |
|
| CX01 | Expiry of patent term |