CN218359465U - Circular cone breaker is used in production of building rubbish reclaimed sand - Google Patents

Circular cone breaker is used in production of building rubbish reclaimed sand Download PDF

Info

Publication number
CN218359465U
CN218359465U CN202222841004.5U CN202222841004U CN218359465U CN 218359465 U CN218359465 U CN 218359465U CN 202222841004 U CN202222841004 U CN 202222841004U CN 218359465 U CN218359465 U CN 218359465U
Authority
CN
China
Prior art keywords
barrel
wall
broken
reclaimed sand
producing
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
Application number
CN202222841004.5U
Other languages
Chinese (zh)
Inventor
王亚辉
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.)
Hebei Jiarui New Building Materials Technology Co ltd
Original Assignee
Hebei Jiarui New Building Materials Technology 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 Hebei Jiarui New Building Materials Technology Co ltd filed Critical Hebei Jiarui New Building Materials Technology Co ltd
Priority to CN202222841004.5U priority Critical patent/CN218359465U/en
Application granted granted Critical
Publication of CN218359465U publication Critical patent/CN218359465U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/58Construction or demolition [C&D] waste
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/78Recycling of wood or furniture waste
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Landscapes

  • Crushing And Pulverization Processes (AREA)

Abstract

The utility model discloses a conical crushing device for producing construction waste reclaimed sand, which comprises a lower barrel body, wherein the top end of the lower barrel body is provided with an upper barrel body matched with the lower barrel body through an adjusting mechanism, the bottom end of the upper barrel body is provided with a sandglass-shaped crushing barrel, the bottom end of the crushing barrel is provided with a guide connecting barrel contacted with the inner wall of the lower barrel body, the inner cavity of the lower barrel body is provided with a support frame, and the top end of the support frame is provided with a mounting plate; the utility model discloses can utilize adjustment mechanism to adjust the distance between last barrel and the lower barrel for the inside up-and-down motion of barrel under is being led to the connecting cylinder, thereby the height of the broken section of thick bamboo of barrel bottom is adjusted on the drive, and then is convenient for adjust the distance between the inner wall of broken section of thick bamboo and the outer wall of broken awl, has improved this circular cone breaker's suitability, makes this circular cone breaker can adapt to the broken use of waste materials such as heterogeneous brick, stone, concrete.

Description

Circular cone breaker is used in production of building rubbish reclaimed sand
Technical Field
The utility model relates to a building rubbish correlation technique field specifically is a circular cone breaker is used in production of building rubbish reclaimed sand.
Background
Along with the acceleration of the urbanization process, a large amount of construction waste is generated in urban construction and old city reconstruction, the quantity of the construction waste accounts for 30-40% of the total quantity of the urban waste, the construction waste is not real waste but is 'gold' misplaced, most of the construction waste can be reused as renewable resources after being sorted, removed or crushed, such as waste steel bars, waste iron wires, waste electric wires and other metals, and can be processed into steel products with various specifications after being sorted, concentrated and recycled; the waste bamboo and wood can be used for manufacturing artificial wood; the waste materials such as bricks, stones, concrete and the like can be used for replacing sand, building mortar, plastering mortar and the like, and can also be used for manufacturing building material products such as paving bricks, lattice bricks and the like. The method ensures that the construction waste regeneration has the outstanding advantages of high utilization rate, low production cost, wide application range and good environmental and economic benefits.
When carrying out the breakage to waste materials such as brick, stone, concrete, present circular cone breaker's suitability is lower, can not adjust the distance between broken awl and the broken section of thick bamboo inner wall.
SUMMERY OF THE UTILITY MODEL
For solving the defect that prior art exists, the utility model provides a circular cone breaker is used in production of building rubbish reclaimed sand.
In order to solve the technical problem, the utility model provides a following technical scheme:
the utility model relates to a circular cone breaker is used in production of building rubbish reclaimed sand, including lower barrel, the top of barrel is equipped with the last barrel that matches with lower barrel through adjustment mechanism down, the bottom of going up the barrel is equipped with the broken section of thick bamboo of hourglass shape, the bottom of broken section of thick bamboo is equipped with the direction connecting cylinder with the contact of lower barrel inner wall, the inner chamber of barrel is equipped with the support frame down, and the top of support frame is equipped with the mounting panel, and the top of mounting panel is equipped with the broken awl of broken concrete waste material that cooperatees with broken section of thick bamboo, and broken awl pivoted driving motor of drive is installed to the bottom of mounting panel.
As an optimal technical scheme of the utility model, the top of going up the barrel is equipped with leaks hopper-shaped's feeder hopper, the top threaded connection of feeder hopper has and is used for sealing feeder hopper open-ended apron.
As a preferred technical scheme of the utility model, the top of broken awl is equipped with vertical ascending guide bar, and the top of guide bar is equipped with the stopper, sets up the guiding hole that supplies the guide bar motion on going up the barrel.
As an optimized technical scheme of the utility model, the bin outlet has been seted up on the mounting panel, the bottom of bin outlet is equipped with the row's material pipe that the slope set up.
As a preferred technical scheme of the utility model, the bottom of broken awl is equipped with the revolving stage that contacts with the mounting panel, the mounting groove has been seted up to the lateral wall of revolving stage, and the inside of mounting groove is equipped with reset spring, the inside of mounting groove is equipped with the scraper blade that stretches out the mounting groove, and the outer tip slope of scraper blade sets up.
As a preferred technical scheme of the utility model, the pull mouth has been seted up to the lateral wall of barrel down, the inner chamber of barrel is equipped with down be used for collecting broken material and with pull mouth assorted collecting box, the outer tip of collecting box is equipped with the handle.
As a preferred technical scheme of the utility model, adjustment mechanism is including establishing the first fixed block of barrel outer wall down, threaded connection has vertical ascending adjusting screw on the first fixed block, and the outer wall of going up the barrel is equipped with the second fixed block with adjusting screw threaded connection.
As a preferred technical scheme of the utility model, the top of barrel is equipped with a plurality of vertical ascending guide bars down, goes up the bottom of barrel and seted up with guide bar assorted guide way.
As a preferred technical scheme of the utility model, the support frame is including establishing barrel inner wall under and being the support of groined type, and the top of support is equipped with the vertical bracing piece that makes progress and be connected with the mounting panel diapire.
The utility model has the advantages that:
1. this kind of circular cone breaker is used in production of building rubbish reclaimed sand, when carrying out the breakage to the concrete waste material, the inside driving motor output shaft of barrel drives broken rotation down, broken awl cooperatees with the inside broken section of thick bamboo inner wall that is hourglass shape of last barrel and carries out broken handle to the concrete waste material, be convenient for carry out broken handle to the concrete waste material, and can utilize adjustment mechanism to adjust the distance between last barrel and the lower barrel, make the inside up-and-down motion of barrel under of direction connecting cylinder, thereby the height of the broken section of thick bamboo that drives the barrel bottom is adjusted, and then be convenient for adjust the distance between the outer wall of the inner wall of broken section of thick bamboo and broken awl, this circular cone breaker's suitability has been improved, make this circular cone breaker can adapt to the heterogeneous brick, stone, waste materials such as concrete are broken and are used.
2. This kind of circular cone breaker is used in production of building rubbish reclaimed sand, when adjusting the distance between broken awl outer wall and the broken section of thick bamboo inner wall, rotate adjusting screw, adjusting screw and second fixed block threaded connection, make the second fixed block move along adjusting screw's direction, the second fixed block drives the direction motion of barrel along adjusting screw, go up the direction motion of barrel drive broken section of thick bamboo along adjusting screw, just can adjust the distance between broken awl outer wall and the broken section of thick bamboo inner wall, be convenient for adjust the distance between broken awl outer wall and the broken section of thick bamboo inner wall, it is also high to adjust stability.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a sectional view of the construction of a conical crusher for producing construction waste reclaimed sand of the present invention;
FIG. 2 is a sectional view of the scraper structure of the conical crushing device for producing construction waste reclaimed sand of the utility model;
FIG. 3 is a sectional view of the adjusting mechanism of the conical crushing device for producing construction waste reclaimed sand of the utility model;
fig. 4 is the utility model relates to a building rubbish reclaimed sand production is with circular cone breaker's supporting frame structure sketch map.
In the figure: 1. a lower cylinder body; 2. an adjustment mechanism; 3. an upper cylinder body; 4. a crushing cylinder; 5. a guide connecting cylinder; 6. a support frame; 7. mounting a plate; 8. a crushing cone; 9. a drive motor; 10. a feed hopper; 11. a cover plate; 12. a guide bar; 13. a limiting block; 14. a discharge outlet; 15. a discharge pipe; 16. a rotating table; 17. mounting grooves; 18. a return spring; 19. a squeegee; 20. a collection box; 21. a first fixed block; 22. adjusting the screw rod; 23. a second fixed block; 24. a guide rod; 25. a guide groove; 26. a support; 27. a support rod.
Detailed Description
The preferred embodiments of the present invention will be described hereinafter with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are merely for purposes of illustration and explanation, and are not intended to limit the present invention.
Example (b): as shown in fig. 1, fig. 2, fig. 3 and fig. 4, the utility model relates to a circular cone breaker is used in production of building rubbish reclaimed sand, including barrel 1 down, barrel 1's top is equipped with through adjustment mechanism 2 and barrel 1 assorted last barrel 3 down, the bottom of going up barrel 3 is equipped with the broken section of thick bamboo 4 of hourglass shape, the bottom of broken section of thick bamboo 4 is equipped with the direction connecting cylinder 5 that contacts with barrel 1 inner wall down, barrel 1's inner chamber is equipped with support frame 6 down, and support frame 6's top is equipped with mounting panel 7, and the top of mounting panel 7 is equipped with the broken awl 8 that matches broken concrete waste material with broken section of thick bamboo 4, and the broken awl 8 pivoted driving motor 9 of drive is installed to the bottom of mounting panel 7.
Wherein, the top of going up barrel 3 is equipped with hopper-shaped feeder hopper 10, the top threaded connection of feeder hopper 10 has and is used for sealing 10 open-ended apron 11 of feeder hopper, and feeder hopper 10 can make progress 3 inside reinforced of barrels, and apron 11 can avoid the dust in the crushing process to fly out.
Wherein, the top of broken awl 8 is equipped with vertical ascending guide bar 12, and the top of guide bar 12 is equipped with stopper 13, sets up the guiding hole that supplies the motion of guide bar 12 on going up barrel 3, can play fine guide effect to broken awl 7.
Wherein, the mounting panel 7 is provided with a discharge outlet 14, the bottom end of the discharge outlet 14 is provided with a discharge pipe 15 which is obliquely arranged, and broken materials are discharged into the discharge pipe 15 through the discharge outlet 14 and are discharged from the discharge pipe 15.
Wherein, the bottom of broken awl 8 is equipped with the revolving stage 16 that contacts with mounting panel 7, mounting groove 17 has been seted up to the lateral wall of revolving stage 16, and the inside of mounting groove 17 is equipped with reset spring 18, the inside of mounting groove 17 is equipped with the scraper blade 19 that stretches out mounting groove 17, and the outer tip slope of scraper blade 19 sets up, and driving motor 9's output shaft drives revolving stage 16 and rotates, and revolving stage 16 drives scraper blade 19 and rotates, scrapes broken waste material to bin outlet 14, and when adjusting the distance between 8 outer walls of broken awl and the 4 inner walls of broken section of thick bamboo, under reset spring 18's elastic potential energy effect, the length that scraper blade 19 stretches out mounting groove 17 can be adjusted, does not influence the distance adjustment between 8 outer walls of broken awl and the 4 inner walls of broken section of thick bamboo.
Wherein, the pull mouth has been seted up to the lateral wall of barrel 1 down, the inner chamber of barrel 1 is equipped with and is used for collecting broken material and with pull mouth assorted collecting box 20 down, the outer tip of collecting box 20 is equipped with the handle, broken waste material is arranged into the inside of collecting box 20 through arranging material pipe 15, pulls out collecting box 20 through the pull mouth from barrel 1 inner chamber down through the handle.
Wherein, adjustment mechanism 2 is including establishing the first fixed block 21 at barrel 1 outer wall down, threaded connection has vertical ascending adjusting screw 22 on the first fixed block 21, and the outer wall of last barrel 3 is equipped with the second fixed block 23 with adjusting screw 22 threaded connection, the top of barrel 1 is equipped with a plurality of vertical ascending guide bars 24 down, go up the bottom of barrel 3 seted up with guide bar 24 assorted guide way 25, when adjusting the distance between 8 outer walls of broken awl and the broken section of thick bamboo 4 inner wall, rotate adjusting screw 22, adjusting screw 22 and the threaded connection of second fixed block 23 for second fixed block 23 moves along adjusting screw 22's direction, and second fixed block 23 drives barrel 3 and moves along adjusting screw 22's direction, and it moves along adjusting screw 22's direction to go up barrel 3 and drive broken section of thick bamboo 4, just can adjust the distance between 8 outer walls of broken awl and the broken section of thick bamboo 4 inner wall, is convenient for adjust the distance between 8 outer walls of broken awl and the broken section of thick bamboo 4 inner wall, and adjusts stability also high, and guide bar 24 moves in the inside of guide way 25.
The support frame 6 comprises a support 26 which is arranged on the inner wall of the lower barrel 1 and is in a shape like a Chinese character jing, and a support rod 27 which is vertically upward and connected with the bottom wall of the mounting plate 7 is arranged at the top end of the support 26 and can support the mounting plate 7.
During operation, this kind of circular cone breaker is used in production of building rubbish reclaimed sand, when carrying out the breakage to the concrete waste material, the inside driving motor 9 output shaft of lower barrel 1 drives broken the rotation, broken awl 8 cooperatees with the inside broken section of thick bamboo 4 inner wall that is hourglass shape of last barrel 3 and carries out crushing treatment to the concrete waste material, be convenient for carry out crushing treatment to the concrete waste material, and can utilize adjustment mechanism 2 to adjust the distance between last barrel 3 and the lower barrel 1, make the inside up-and-down motion of guide connecting cylinder 5 barrel 1 down, thereby drive the height of the broken section of thick bamboo 4 of last barrel 3 bottom and adjust, and then be convenient for adjust the distance between the outer wall of the inner wall of broken section of thick bamboo 4 and broken awl 8, this circular cone breaker's suitability has been improved, make this circular cone breaker can adapt to heterogeneous brick, stone, waste material such as concrete is broken to use.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a circular cone breaker is used in production of building rubbish reclaimed sand, a serial communication port, including barrel (1) down, the top of barrel (1) is equipped with through adjustment mechanism (2) and barrel (1) assorted last barrel (3) down, the bottom of going up barrel (3) is equipped with broken section of thick bamboo (4) of hourglass shape, the bottom of broken section of thick bamboo (4) is equipped with direction connecting cylinder (5) that contact with barrel (1) inner wall down, the inner chamber of barrel (1) is equipped with support frame (6) down, and the top of support frame (6) is equipped with mounting panel (7), and the top of mounting panel (7) is equipped with broken awl (8) of breaking concrete waste material with broken section of thick bamboo (4) cooperation, and the bottom of mounting panel (7) is installed and is driven broken awl (8) pivoted driving motor (9).
2. The conical crushing device for producing the reclaimed sand of the construction wastes as claimed in claim 1, wherein a funnel-shaped feed hopper (10) is arranged at the top end of the upper cylinder (3), and a cover plate (11) for sealing the opening of the feed hopper (10) is connected to the top end of the feed hopper (10) in a threaded manner.
3. The conical crushing device for producing the construction waste regenerated sand, according to claim 1, is characterized in that a guide rod (12) which is vertically upward is arranged at the top end of the crushing cone (8), a limiting block (13) is arranged at the top end of the guide rod (12), and a guide hole for the guide rod (12) to move is formed in the upper cylinder (3).
4. The conical crushing device for producing the construction waste reclaimed sand is characterized in that a discharge opening (14) is formed in the mounting plate (7), and a discharge pipe (15) which is obliquely arranged is arranged at the bottom end of the discharge opening (14).
5. The conical crushing device for producing the construction waste regenerated sand is characterized in that a rotating table (16) which is in contact with the mounting plate (7) is arranged at the bottom end of the crushing cone (8), a mounting groove (17) is formed in the side wall of the rotating table (16), a return spring (18) is arranged inside the mounting groove (17), a scraping plate (19) extending out of the mounting groove (17) is arranged inside the mounting groove (17), and the outer end of the scraping plate (19) is obliquely arranged.
6. The conical crushing device for producing the reclaimed sand of the construction wastes according to claim 1, wherein a drawing opening is formed in the side wall of the lower cylinder (1), a collecting box (20) which is used for collecting the crushed materials and matched with the drawing opening is arranged in the inner cavity of the lower cylinder (1), and a handle is arranged at the outer end part of the collecting box (20).
7. The conical crushing device for producing the reclaimed sand of the construction wastes as claimed in claim 1, wherein the adjusting mechanism (2) comprises a first fixing block (21) arranged on the outer wall of the lower cylinder (1), the first fixing block (21) is in threaded connection with an adjusting screw (22) vertically upwards, and the outer wall of the upper cylinder (3) is provided with a second fixing block (23) in threaded connection with the adjusting screw (22).
8. The conical crushing device for producing the reclaimed sand of the construction wastes according to claim 7, wherein a plurality of vertical upward guide rods (24) are arranged at the top end of the lower cylinder (1), and a guide groove (25) matched with the guide rods (24) is formed at the bottom end of the upper cylinder (3).
9. The conical crushing device for producing the reclaimed sand of the construction wastes as claimed in claim 1, wherein the supporting frame (6) comprises a bracket (26) which is arranged on the inner wall of the lower cylinder body (1) and is in a # -shape, and a supporting rod (27) which is vertically upward and is connected with the bottom wall of the mounting plate (7) is arranged at the top end of the bracket (26).
CN202222841004.5U 2022-10-27 2022-10-27 Circular cone breaker is used in production of building rubbish reclaimed sand Active CN218359465U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202222841004.5U CN218359465U (en) 2022-10-27 2022-10-27 Circular cone breaker is used in production of building rubbish reclaimed sand

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202222841004.5U CN218359465U (en) 2022-10-27 2022-10-27 Circular cone breaker is used in production of building rubbish reclaimed sand

Publications (1)

Publication Number Publication Date
CN218359465U true CN218359465U (en) 2023-01-24

Family

ID=84934582

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202222841004.5U Active CN218359465U (en) 2022-10-27 2022-10-27 Circular cone breaker is used in production of building rubbish reclaimed sand

Country Status (1)

Country Link
CN (1) CN218359465U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117225508A (en) * 2023-10-11 2023-12-15 麦肯嘉顿(江苏)食品有限公司 Smashing device for food processing machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117225508A (en) * 2023-10-11 2023-12-15 麦肯嘉顿(江苏)食品有限公司 Smashing device for food processing machine
CN117225508B (en) * 2023-10-11 2024-03-01 麦肯嘉顿(江苏)食品有限公司 Smashing device for food processing machine

Similar Documents

Publication Publication Date Title
CN210994483U (en) Stone crushing equipment for highway construction
CN218359465U (en) Circular cone breaker is used in production of building rubbish reclaimed sand
CN211099224U (en) Building rubbish crushing treatment equipment
CN210613978U (en) Movable construction waste crushing station
CN207187865U (en) A kind of building waste recycling reducing mechanism
CN107283681A (en) A kind of large-scale vertical plastic breaker
CN220027683U (en) Tailing treatment screening mechanism
CN211937163U (en) Quick reducing mechanism of mechanism sand
CN202737059U (en) Treatment system for waste lead-acid batteries
CN216224691U (en) Recycled concrete aggregate processing device
CN207308086U (en) A kind of civil engineering work waste treatment device
CN213868245U (en) Special desilting device of mine tunnel escape canal
CN220759337U (en) Shaping device for building rubbish recycled aggregate
CN215198266U (en) Winnowing device for recycling building garbage
CN219334463U (en) Raw material crushing equipment for sintering green bricks and tiles by utilizing solid waste
CN219442378U (en) Automatic separating device for stone processing soil and stone of highway pavement
CN215088715U (en) Aggregate dust collector of rubble is stabilized to cement
CN113526897B (en) Automatic sealing device for construction waste recycled concrete blocks
CN217830265U (en) Construction waste crushing device convenient to classify
CN219597258U (en) Abandoned concrete separator for improved concrete production
CN218167148U (en) Novel efficient fine sand and stone crushing device
CN221183690U (en) Screening device for concrete mixing
CN219744965U (en) Recycled concrete waste water waste recovery equipment
CN215197118U (en) Sieving mechanism for building rubbish
CN110653030A (en) Impurity removing equipment for construction waste

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant