CN105672861B - A kind of Foldable door - Google Patents
A kind of Foldable door Download PDFInfo
- Publication number
- CN105672861B CN105672861B CN201610162255.7A CN201610162255A CN105672861B CN 105672861 B CN105672861 B CN 105672861B CN 201610162255 A CN201610162255 A CN 201610162255A CN 105672861 B CN105672861 B CN 105672861B
- Authority
- CN
- China
- Prior art keywords
- swing arm
- door leaf
- door
- arm
- torque arm
- 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.)
- Active
Links
- 230000000694 effects Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B11/00—Means for allowing passage through fences, barriers or the like, e.g. stiles
- E06B11/02—Gates; Doors
- E06B11/022—Gates; Doors characterised by the manner of movement
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/60—Power-operated mechanisms for wings using electrical actuators
- E05F15/603—Power-operated mechanisms for wings using electrical actuators using rotary electromotors
- E05F15/605—Power-operated mechanisms for wings using electrical actuators using rotary electromotors for folding wings
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2201/00—Constructional elements; Accessories therefor
- E05Y2201/60—Suspension or transmission members; Accessories therefor
- E05Y2201/622—Suspension or transmission members elements
- E05Y2201/624—Arms
Landscapes
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Power-Operated Mechanisms For Wings (AREA)
Abstract
The present invention relates to one kind being opened flat structure of folding door, especially a kind of Foldable door.The distal end of swing arm extends to the folding position direction between first door leaf and the second door leaf in the folding door, the distal end of swing arm is equipped with the first torque arm and the second torque arm by a shaft, first torque arm and the second torque arm are installed on by shaft in first door leaf and the second door leaf respectively, when folding door body flattening, the distal end of swing arm is more than the folding position between first door leaf and the second door leaf.A kind of Foldable door of the present invention is by being arranged a swing arm and two torque arm and reasonably according to the length and angle of Torque Control swing arm and torque arm, so that driving the drive mechanism when rotation and folding of door leaf to significantly simplify by the same power source, and in action process, each component is close to door leaf progress, is not take up the lateral distance of door leaf.
Description
Technical field
The present invention relates to one kind being opened flat structure of folding door, especially a kind of Foldable door.
Background technology
Vertical hinged door is one kind of garden door, structure be by a fan either multiple leaf door body is hinged and cavity or column on,
Switch gate is realized by the rotation of door leaf.With the development for being opened flat gate technique, occur driving door leaf by motor on the market
The automatic vertical hinged door of rotation, such automatic vertical hinged door drive swing arm that door leaf is driven to rotate by motor, should on unilateral door leaf
When door leaf jackknife action is completed in the rotation of completion door leaf again, a variety of solutions are given in existing product：
Such as Patent No. CN201420649256.0, disclosed in the patent document of entitled " a kind of electronic outstanding be folded flat enabling "
A kind of vertical hinged door, this vertical hinged door controls the door leaf rotation of vertical hinged door respectively by two motors and door leaf folds, this structure
Mode is relatively simple, and deficiency is mainly manifested in, and cost is increased using two motors, and rotating mechanism and foldable structure it
Between drive connection is not present, action is not readily coordinated；
Such as Patent No. CN201410030642.6, filled by swing rod in the patent document of entitled " electric foldable flat-opening door "
The transmission set is coordinated by the gear on oscillating rod device and the second door leaf when first door leaf is rotated, rotation is transmitted to second
On door leaf, it is made to fold or be unfolded, deficiency is mainly manifested in, and oscillating rod device is vacantly exposed to occupy larger space outside, moves
When making be easy to periphery object generate interference, collide, the cooperation of gear and fluted disc is also unstable, be easy shaken or ash
The influence of dirt and fail, influence normal use；
One kind is disclosed in a kind of Patent No. CN201210048600.6, the patent document of entitled " folding door " to pass through
Pivoted link mechanism carrys out the structure of the Foldable in rotation, this structure fold drive when using more connecting rod, and even
Angle between bar changes during folding and being unfolded, so at a distance from needing to keep larger with door body, structure is made to protrude
In door leaf peripheral space, peripheral space is occupied.Further, it is based on this mentality of designing, in CN201210448249.X, name
Another relevant structure is proposed in a kind of patent for " suspension folding door ", and transmission is realized by a humanoid connector,
But only it is to have done certain variation to the form of transmission parts in the structure, does not overcome occupied space and visually lofty
Problem.
Invention content
In order to solve the above technical problem, the present invention provides a kind of Foldable doors.
To achieve the goals above, the present invention adopts the following technical scheme that：
The mechanism includes the folding door body hingedly formed by first door leaf and the second door leaf, and first door leaf is movably connected on wall
On body or column, a driving motor is equipped in the side of first door leaf, it is characterised in that：One pendulum of driving motor connection
The distal end of arm, the swing arm extends to the folding position direction between first door leaf and the second door leaf, and the distal end of swing arm passes through one turn
Axis is equipped with the first torque arm and the second torque arm, and the first torque arm and the second torque arm are installed on first door leaf and second by shaft respectively
On door leaf, when folding door body flattening, the distal end of swing arm is more than the folding position between first door leaf and the second door leaf.
Preferably, the distal end of the swing arm is a C-shaped bayonet, and first torque arm and the second torque arm are installed on swing arm
Distal end C-shaped bayonet in.
Preferably, second torque arm is C-shaped configuration, and the open end of the second torque arm of the C-shaped configuration is by turning
Axis is installed with swing arm and the first torque arm, and the blind end of the second torque arm of the C-shaped configuration is installed on second by shaft
On fan.
Preferably, inswept area when the upper and lower end face of the second torque arm of the C-shaped configuration includes covering the first torque arm rotation
The extended surface in domain.
Preferably, the swing arm is the adjustable swing arm of length.
Preferably, the swing arm includes the first swing arm and the second swing arm of socket, between the first swing arm and the second swing arm
Pass through screw hole and the opposite socket length of positioning screw control and fixation.
Preferably, the swing arm includes the first swing arm and the second swing arm being linked in sequence, the first swing arm and the second swing arm
Between be equipped with screw rod and nut for adjusting relative distance.
Preferably, the swing arm and the lower section of motor output shaft connecting portion are equipped with a limited block, and limited block is with swing arm
Swing and rotate, by limited block be equipped with and the matched shutdown limited post of limited block and door open limit column.
Preferably, first torque arm and the second torque arm are connected by a fixed seat and first door leaf and the second door leaf respectively
It connects, shaft is set in the fixed seat.
A kind of Foldable door of the invention is by being arranged a swing arm and two torque arm simultaneously due to the above structure,
Reasonably according to the length and angle of Torque Control swing arm and torque arm so that drive rotation and the folding of door leaf by the same power source
Drive mechanism when folded significantly simplifies, and in action process, and each component is close to door leaf progress, be not take up the side of door leaf away from
From.
Description of the drawings
Fig. 1 is the overall structure diagram of first embodiment of the invention；
Fig. 2 is the structure top view when door leaf of first embodiment of the invention is closed；
Fig. 3 is the structure top view in the door leaf switching process of first embodiment of the invention；
Fig. 4 is the structure top view when door leaf of first embodiment of the invention is opened；
Fig. 5 is the mounting structure schematic diagram of the folding running part of first embodiment of the invention；
Fig. 6 is the swing arm structure schematic diagram of first embodiment of the invention；
Fig. 7 is the position limiting structure schematic diagram of first embodiment of the invention.
Fig. 8 is the entirety perspective view of second embodiment of the invention；
Fig. 9 is the bottom substance schematic diagram of second embodiment of the invention；
Figure 10 is the explosive view of the folding running part of second embodiment of the invention.
Specific implementation mode
As shown in Fig. 1-Fig. 7, a kind of Foldable door of the first embodiment of the present invention includes by first door leaf 1 and second
The folding door body that door leaf 2 is hingedly formed, first door leaf 1 are movably connected on wall or column, are equipped in the side of first door leaf 1
One driving motor 3, the driving motor 3 connect a swing arm 4, and the distal end of the swing arm 4 is to first door leaf 1 and the second door leaf 2
Between fold position direction and extend, the distal end of swing arm 4 is equipped with the first torque arm 6 and the second torque arm 7 by a shaft 5, and first draws
Arm 6 and the second torque arm 7 are installed on by shaft 8,9 in first door leaf 1 and the second door leaf 2 respectively, when folding door body flattening, pendulum
The distal end of arm 4 is more than the folding position between first door leaf 1 and the second door leaf 2 while in the triangle being made of shaft 5,8,9
Angle in region between the second torque arm 7 and the second door body 2 is more than the angle between the first torque arm 6 and the first door body 1.For control
The needs of torque processed, in order to preferably drive rotation and the first door leaf and second of first door leaf by a motor
The folding of door leaf, when first door leaf and the second door leaf are fully deployed, the second torque arm 7 is approached perpendicular to the second door leaf 2.
In the installation relation of swing arm 4, the first torque arm 6 and the second torque arm 7, only meet in principle second in delta-shaped region
Angle between torque arm 7 and the second door body 2 is more than the angle between the first torque arm 6 and the first door body 1, so most basic
Structure is to be installed swing arm 4, the first torque arm 6 and 7 activity of the second torque arm by shaft 5, is based on this basic demand, this implementation
Three kinds of realization methods are proposed in example：
1, the installation position of the shaft 5 of swing arm 4, the first torque arm 6 and the second torque arm 7 is single layer structure, and shaft 5 passes through pendulum
One end of arm 4, the first torque arm 6 and the second torque arm 7 forms the movable connection structure that three stackings add, still, due in operational process
In, swing arm 4, the stress of the first torque arm 6 and the second torque arm 7 and force direction are all different, and cause swing arm 4, the first torque arm 6 and
Two torque arm 7 are all different relative to the force direction of shaft 5, in the case, be easy to cause the shaking of connecting portion, to
Influence the smoothness and stability of switch gate action；
2, it is a C-shaped bayonet in the distal end of the swing arm 4, first torque arm and the second torque arm are installed on swing arm
In the C-shaped bayonet of distal end.In this configuration, swing arm 4 by the first torque arm and the second torque arm packet wherein, then passing through shaft
5 installations, shaft 5 pass through one end of swing arm 4, the first torque arm 6 and the second torque arm 7 to form the movable connection structure that four stackings add,
When operating, the upper and lower side of shaft 5 is limited by the upper and lower end face at the C-shaped bayonet of swing arm 4 respectively, avoid due to unbalance stress and
Caused by shaft shaking, to improve the smoothness and stability of operating.
3, in order to further improve smoothness and stability, on the basis of the above second way, further by institute
The second torque arm 7 stated is designed as C-shaped configuration, the open end of the second torque arm 7 of the C-shaped configuration by shaft 5 and swing arm 4 with
And first torque arm 6 install, the blind end of the second torque arm 7 of the C-shaped configuration is installed on by shaft 9 on the second door leaf.
Under this structure, shaft 5 forms five layers of stress surface with swing arm 4, the first torque arm 6 and the second torque arm 7, keeps the operating of shaft more steady
It is fixed.
Three of the above mode can be realized and be driven by same motor, via swing arm 4, the first torque arm 6 and the second torque arm 7
The rotation that is driven to realize first door leaf and first door leaf and the second door leaf it is folded against, realization is opened flat the switch gate of folding door
Operation when practical application, can select one way in which real according to the needs of material cost, required precision or usage scenario
It is existing.
Based on above structure, the Foldable door of the present embodiment is realized drives the rotation of first door leaf by a motor
Turn and while the folded against and expansion of first door leaf and the second door leaf, has also significantly simplified transmission mechanism, substantially reduced
Occupancy of the transmission mechanism to door leaf surrounding space.
Further, in above-mentioned mechanism, swing arm 4 is at work regular length, can pass through survey in actual use
It measures to calculate required pendulum arm length, according to being used after the swing arm that the length processing is fixed length, is then applied actual
In work, since door body specification is numerous, each swing arm is required for measuring and calculate, then workload is larger, is unfavorable for component
Batch machining, so in the present embodiment, the swing arm 4 is the adjustable swing arm of length.
In terms of the specific adjustment structure of adjustable swing arm, two ways set forth below, in the first structure, the swing arm
4 include the first swing arm 41 and the second swing arm 42 being linked in sequence, and is equipped between the first swing arm 41 and the second swing arm 42 for adjusting
The screw rod 43 and nut 44 of relative distance.Though the adjusting of relative distance may be implemented in this structure, to the essence of component cooperation
Spend it is more demanding, in order to solve this problem, it is further proposed that the following second way：
In conjunction with shown in Fig. 9 and Figure 10, in second of structure, the swing arm includes the first swing arm 45 and second of socket
Swing arm 46, the second swing arm 46 are socketed in the first swing arm 45, and the first swing arm 45 (is equipped with screw equipped with multiple location holes in figure
47, location hole is not shown), the second swing arm 46 realizes positioning with the first swing arm 45 and solid by the screw 47 installed in location hole
It is fixed.Under this structure, as long as ensureing that the distance between location hole is equal can be realized good installation cooperation.
When it is implemented, the swing arm structure of the swing arm of the above regular length and two kinds of adjustable-lengths can be according to actual feelings
Condition selects a use.
In other structures, in the present embodiment, the lower section of the swing arm 4 and motor output shaft connecting portion is equipped with a limit
Position block 10, limited block 10 are rotated with the swing of swing arm 4, are equipped on 10 side of limited block and are limited with 10 matched shutdown of limited block
Column 11 and door open limit column 12.
In the present embodiment, first torque arm 6 and the second torque arm 7 respectively by a fixed seat 13 and first door leaf 1 and
Second door leaf 2 connects, and shaft 8,9 is set in the fixed seat.
As Figure 8-Figure 10, it is based on above-mentioned first embodiment it is further proposed that second embodiment, it is smooth for operation,
It is generally required at the shaft 5 of swing arm 4, the first torque arm 6 and the second torque arm 7 and carries out painting oil lubrication, and component is directly exposed to outside
Be easy because rainwater, dust influence due to cause the rapid failure of lubricating action, to cause door leaf operation to block, motor operation pressure
Power is big, and noise increases, or while having children that finger is extend into matching part is easy clamp hand, in order to avoid component is exposed to
Outer and improve safety, in the present embodiment, the upper and lower end face of the second torque arm 7 of the C-shaped configuration includes the first torque arm of covering
The extended surface 71 in inswept region when rotation.Remaining structure of second embodiment is identical with the first embodiment, and is not repeating to say herein
It is bright.
The foregoing is merely the preferred embodiment of the present invention, are not intended to limit the scope of the invention, every utilization
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content is applied directly or indirectly in other correlations
Technical field, be included within the scope of the present invention.
Claims (9)
1. a kind of Foldable door includes the folding door body hingedly formed by first door leaf and the second door leaf, first door leaf activity
It is connected on wall or column, a driving motor is equipped in the side of first door leaf, it is characterised in that：The driving motor connects
A swing arm is connect, the distal end of the swing arm extends to the folding position direction between first door leaf and the second door leaf, and the distal end of swing arm is logical
It crosses a shaft and the first torque arm and the second torque arm is installed, the first torque arm and the second torque arm are installed on first door leaf by shaft respectively
On the second door leaf, when folding door body flattening, the distal end of swing arm is more than the folding position between first door leaf and the second door leaf.
2. a kind of Foldable door as described in claim 1, it is characterised in that：The distal end of the swing arm is a C-shaped bayonet,
In the C-shaped bayonet for the distal end that first torque arm and the second torque arm is installed on swing arm.
3. a kind of Foldable door as claimed in claim 2, it is characterised in that：Second torque arm is C-shaped configuration, institute
The open end of second torque arm of the C-shaped configuration stated is installed by shaft and swing arm and the first torque arm, and the of the C-shaped configuration
The blind end of two torque arm is installed on by shaft on the second door leaf.
4. a kind of Foldable door as claimed in claim 3, it is characterised in that：Second torque arm of the C-shaped configuration it is upper
Lower face includes the extended surface in inswept region when covering the first torque arm rotation.
5. a kind of Foldable door as described in any one of claim 1-4, it is characterised in that：The swing arm is that length can
Adjust swing arm.
6. a kind of Foldable door as claimed in claim 5, it is characterised in that：The swing arm includes the first swing arm of socket
With the second swing arm, pass through screw hole and the opposite socket length of positioning screw control and fixation between the first swing arm and the second swing arm.
7. a kind of Foldable door as claimed in claim 5, it is characterised in that：The swing arm includes first to be linked in sequence
Swing arm and the second swing arm are equipped with screw rod and nut for adjusting relative distance between the first swing arm and the second swing arm.
8. a kind of Foldable door as described in any one of claim 1-4, it is characterised in that：The swing arm and motor are defeated
The lower section of shaft connecting portion is equipped with a limited block, and limited block is rotated with the swing of swing arm, is equipped with and limit by limited block
The matched shutdown limited post of block and door open limit column.
9. a kind of Foldable door as described in any one of claim 1-4, it is characterised in that：First torque arm and
Two torque arm are connect by a fixed seat with first door leaf and the second door leaf respectively, and shaft is set in the fixed seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610162255.7A CN105672861B (en) | 2016-03-20 | 2016-03-20 | A kind of Foldable door |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610162255.7A CN105672861B (en) | 2016-03-20 | 2016-03-20 | A kind of Foldable door |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105672861A CN105672861A (en) | 2016-06-15 |
| CN105672861B true CN105672861B (en) | 2018-10-19 |
Family
ID=56311212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610162255.7A Active CN105672861B (en) | 2016-03-20 | 2016-03-20 | A kind of Foldable door |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105672861B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108118998A (en) * | 2017-12-26 | 2018-06-05 | 江苏金峰门业有限公司 | A kind of new type foldable door drive mechanism |
| CN108683097B (en) * | 2018-06-06 | 2023-10-03 | 荣马电器有限公司 | Dual-power control box of smoke exhaust fan |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202011101870U1 (en) * | 2011-06-16 | 2011-09-22 | Rainer Wiesmann | Fully hydraulic gate, 2 leaves, horizontally split, opening upwards |
| CN104612576B (en) * | 2014-12-21 | 2016-08-17 | 温贵 | There is the suspension folding door of triangle side link link gear |
| CN204571705U (en) * | 2015-01-09 | 2015-08-19 | 北京永亮建业自动门技术有限公司 | For the jointed gear unit of folding door |
| CN205445438U (en) * | 2016-03-20 | 2016-08-10 | 佛山市荣高智能科技有限公司 | Novel foldable door |
-
2016
- 2016-03-20 CN CN201610162255.7A patent/CN105672861B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105672861A (en) | 2016-06-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105672861B (en) | A kind of Foldable door | |
| CN103459100B (en) | Scott-russell mechanism device | |
| CN108247656A (en) | A kind of deformable ternary sequential circuit | |
| CN103982999B (en) | air conditioner | |
| CN104791275B (en) | For the oscillating mechanism of electric fan and the electric fan with it | |
| CN205870557U (en) | Nimble robot that controls on a large scale | |
| CN103505143A (en) | Glass cleaning robot and walking method thereof | |
| CN106091549A (en) | Door opening/closing apparatus and refrigerator | |
| KR20130066124A (en) | Active geometry control suspension system | |
| CN206296909U (en) | The wing motion and the robot with it of robot | |
| KR200456821Y1 (en) | Turning Structure of Celling Fan with Improved Operations Function | |
| CN205445438U (en) | Novel foldable door | |
| CN103264399A (en) | Robot waist-arm integrated synchronous double-drive mechanism and control method thereof | |
| CN108118998A (en) | A kind of new type foldable door drive mechanism | |
| JPH1170858A (en) | Wiper device for vehicle | |
| CN203383707U (en) | Electric vertical curtain | |
| CN205422310U (en) | Novel folding door transmission mechanism | |
| CN105058385A (en) | Series robot | |
| CN208529161U (en) | A kind of durable type electric shear | |
| CN208380482U (en) | A kind of garden door door leaf automatic folding device | |
| CN207607424U (en) | A kind of car activity step device | |
| CN106762008A (en) | A kind of continuous variable valve drive device and its control method | |
| CN206090385U (en) | Crank shakes driven barrier gate core device of piece | |
| CA2842506A1 (en) | Adjusting device | |
| CN209444765U (en) | A kind of flat-pushing mobile device and its device of cranking arm |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 528000, 1st floor, Building 3, No. 473 North Sanshui Avenue, Lubao Town, Sanshui District, Foshan City, Guangdong Province Patentee after: Guangdong Ronggao Door and Window Technology Co.,Ltd. Address before: 528133 Workshop A, No. 22-3, Zone C, Lubaoyuan, Sanshui Center Science and Technology Industrial Zone, Foshan City, Guangdong Province Patentee before: FOSHAN RONGGAO INTELLIGENCE TECHNOLOGY Co.,Ltd. |