CN213414449U - Agricultural production auxiliary tool - Google Patents

Agricultural production auxiliary tool Download PDF

Info

Publication number
CN213414449U
CN213414449U CN202021246353.7U CN202021246353U CN213414449U CN 213414449 U CN213414449 U CN 213414449U CN 202021246353 U CN202021246353 U CN 202021246353U CN 213414449 U CN213414449 U CN 213414449U
Authority
CN
China
Prior art keywords
barrel wall
connecting shaft
clamping
crops
barrel
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
CN202021246353.7U
Other languages
Chinese (zh)
Inventor
常慧男
其他发明人请求不公开姓名
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.)
Jia Yonghu
Original Assignee
Jia Yonghu
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 Jia Yonghu filed Critical Jia Yonghu
Priority to CN202021246353.7U priority Critical patent/CN213414449U/en
Application granted granted Critical
Publication of CN213414449U publication Critical patent/CN213414449U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Packaging Of Special Articles (AREA)

Abstract

The utility model discloses an agricultural is with production appurtenance belongs to agricultural apparatus technical field. The device includes: the device comprises a shell, a barrel body and a clamping device; the upper end of the shell is provided with a first containing cavity and a second containing cavity; the barrel body comprises a first barrel wall, a second barrel wall, a first bolt and a connecting shaft, the first barrel wall is rotatably arranged on the connecting shaft, the second barrel wall is fixedly connected with the connecting shaft, and two ends of the connecting shaft are rotatably arranged on the shell. The utility model has the advantages that: when needs put into the bucket with the sack when with crops bagging-off, clip the sack through clamping device, next only need with crops put into in the sack can, single can operate, and when the sack was filled with crops after outwards pulling the sack, the bucket wall that both sides all can be opened can be very convenient pull out the sack, convenient operation uses manpower sparingly.

Description

Agricultural production auxiliary tool
Technical Field
The utility model relates to an agricultural apparatus technical field, in particular to agricultural is with production appurtenance.
Background
Nowadays, agricultural development is more and more emphasized and the needs of people's lives are added, crops are planted in many areas in the north, a large amount of crops need to be harvested, aired and stored every year, when the steps need to be bagged to be convenient to store or transport, the crops in many areas need to be harvested and bagged manually because of slow popularization of mechanization, but a plurality of people are needed to cooperate with each other when the crops are bagged manually, so that the labor waste is reduced; and if the crop bag is large when bagging corresponds to a high strength requirement for the person co-bagging, it may otherwise happen that the bag is not held.
In conclusion, the problem that multiple persons need to cooperate when crops are bagged and manpower is wasted exists in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model provides an agricultural is with production appurtenance can solve the crops bagging-off that exists among the prior art and need many people cooperation, the problem of extravagant manpower.
An agricultural production aid comprising:
the device comprises a shell, a barrel body and a clamping device;
the upper end of the shell is provided with a first containing cavity and a second containing cavity;
the barrel body comprises a first barrel wall, a second barrel wall, a first bolt and a connecting shaft, the first barrel wall is rotatably arranged on the connecting shaft, the second barrel wall is fixedly connected with the connecting shaft, two ends of the connecting shaft are rotatably arranged on the shell, handles are fixedly arranged on one side surfaces, away from the connecting shaft, of the first barrel wall and the second barrel wall, through holes are formed in the handles, the first bolt is matched with the through holes, a rubber anti-skid layer covers the surfaces of the handles, and the handles are made of cast iron;
the clamping device is used for clamping the bag opening when the crops are bagged.
Preferably, the clamping device comprises a first sliding block, a second sliding block, a first spring, a second spring, a connecting frame, a first clamping ring, a second clamping ring and a second bolt, one end of the first sliding block is hinged to the connecting frame, the other end of the first sliding block is slidably arranged in the first accommodating cavity, one end of the first sliding block, which is located in the first accommodating cavity, is fixedly connected with a projection, one end of the first spring is fixedly connected with the projection, and the other end of the first spring is fixedly connected with the inner wall of the bottom end of the first accommodating cavity; one end of the second sliding block is fixedly connected to one end, far away from the first sliding block, of the connecting frame, the other end of the second sliding block is arranged in the second accommodating cavity in a sliding mode, one end of the second spring abuts against one end, located in the second accommodating cavity, of the second sliding block, and the other end of the second spring is fixedly connected to the inner wall of the bottom end of the second accommodating cavity;
the first clamping ring is fixedly connected with the connecting frame;
the connecting seat is fixedly connected to the lower surface of the connecting frame at one end of the first sliding block, the second clamping ring is rotatably arranged on the connecting seat and comprises a first clamping half ring and a second clamping half ring, the first clamping half ring and the second clamping half ring can rotate, one ends of the first clamping half ring and the second clamping half ring at the second sliding block can be overlapped in a crossed manner, through holes are formed in the first clamping half ring and the second clamping half ring at one end of the second sliding block, and the through holes are matched with the second bolts;
the outer diameter of the first gripper ring is smaller than the inner diameter of the second gripper ring.
Preferably, the outer surface of the first clamping ring is provided with a groove along the circumferential direction, the inner surface of the second clamping ring is provided with a rib along the circumferential direction, the rib does not completely cover the second clamping ring, and the groove is matched with the rib.
Preferably, the bottom end of the housing is fixedly connected with a base, a first chute is formed in the base, a rack is arranged in the first chute in a sliding manner, the lower end of the connecting shaft penetrates through the lower end of the housing and is fixedly connected with a first connecting rod, the lower end of the first connecting rod is fixedly connected with a first gear, and the first gear is matched with the rack;
the base comprises a supporting platform, a first supporting frame, a supporting seat and a supporting device, the supporting seat is fixedly arranged at one end of the base, one end of the first supporting frame is hinged to one end, close to the connecting shaft, of the supporting platform, and the other end of the first supporting frame is fixedly connected to the base;
a second sliding groove is formed in the lower surface of one end, far away from the first support frame, of the supporting platform, and a third sliding block is arranged in the second sliding groove in a sliding mode; the supporting device comprises a second supporting frame, a sleeve and a supporting rod, the second supporting frame is fixedly arranged on the base, the sleeve is hinged to the second supporting frame, the supporting rod is sleeved in the sleeve, one end of the supporting rod is hinged to the third sliding block, and the other end of the supporting rod is hinged to the rack.
Preferably, the inside of the saddle is provided with a gear set and a plurality of anti-skid rollers, the anti-skid rollers are rotatably arranged in the saddle and are of incomplete structures, and the surfaces of the anti-skid rollers are provided with anti-skid rubber layers; the gear set comprises a plurality of outer gear rings and a plurality of second gears, the second gears are rotatably arranged in the saddle, the outer gear rings are fixedly arranged in the middle of the anti-skid rollers, the outer gear rings are matched with the second gears, the number of the outer gear rings and the number of the second gears correspond to that of the anti-skid rollers one by one, and the positions of the second gears correspond to those of the outer gear rings one by one;
the improved steel ball bearing platform is characterized in that a cavity is formed in the bearing platform, a locking device is further arranged in the bearing platform and comprises a stop block, a steel rope, a steel ball and a jacking rod, the stop block is arranged in the cavity in a sliding mode, one end of the steel rope is fixedly connected with the stop block, the other end of the steel rope is fixedly connected with the inner wall of the upper end of the cavity, the steel ball is hinged to the bottom end of the outer wall of one side of the cavity, the jacking rod is slidably arranged in the bearing platform, and one end of the jacking rod is abutted against the lower end of the stop block and the other.
Preferably, the support is fixedly provided with a jacking table.
The utility model has the advantages that: when needs put into the bucket with the sack when with crops bagging-off, clip the sack through clamping device, next only need with crops put into in the sack can, single can operate, and when the sack was filled with crops after outwards pulling the sack, the bucket wall that both sides all can be opened can be very convenient pull out the sack, convenient operation uses manpower sparingly.
Drawings
FIG. 1 is a front view of an auxiliary tool for agricultural production according to the present invention,
FIG. 2 is a schematic view of an agricultural auxiliary tool according to the present invention,
FIG. 3 is an enlarged view of a portion D of FIG. 2 of the agricultural production assisting tool provided by the present invention,
FIG. 4 is a sectional view taken along line A-A in FIG. 2 of the agricultural production assisting tool provided by the present invention,
FIG. 5 is a cross-sectional view of the agricultural production assisting tool shown in FIG. 2B,
FIG. 6 is a cross-sectional view of the agricultural production assisting tool shown in FIG. 2 at C-C,
FIG. 7 is a schematic view of a gear set structure of an agricultural auxiliary tool according to the present invention,
FIG. 8 is an enlarged view of a portion E of FIG. 8 of the agricultural production assisting tool according to the present invention,
fig. 9 is a cross-sectional view of a pallet G-G in the agricultural production auxiliary tool provided by the present invention.
Description of reference numerals:
1-barrel, 11-second barrel wall, 12-first barrel wall, 13-handle, 14-first bolt, 15-connecting shaft, 151-first connecting rod, 152-first gear, 2-clamping device, 21-shell, 211-connecting frame, 22-first slider, 221-second slider, 23-lug, 24-first spring, 241-second spring, 25-first receiving cavity, 251-second receiving cavity, 26-first clamping ring, 261-groove, 27-connecting seat, 28-second clamping ring, 281-first clamping half ring, 282-second clamping half ring, 283-rib, 29-second bolt, 30-saddle, 31-anti-slip roller, 311-external gear ring, 312-second gear, 313-steel ball, 314-stop block, 315-lifting rod, 316-steel rope, 317-cavity, 32-first support frame, 4-base, 41-second sliding groove, 411-third sliding block, 42-support rod, 43-sleeve, 431-second support frame, 44-first sliding groove, 441-rack, 45-support and 451-lifting table.
Detailed Description
In the following, an embodiment of the present invention will be described in detail with reference to the drawings, but it should be understood that the scope of the present invention is not limited by the embodiment.
Example 1:
as shown in fig. 1 to 2, an auxiliary tool for agricultural production provided by the embodiment of the present invention includes a housing 21, a barrel 1 and a clamping device 2;
the upper end of the shell 21 is provided with a first containing cavity 25 and a second containing cavity 251;
the barrel body 1 comprises a first barrel wall 12, a second barrel wall 11, a first bolt 14 and a connecting shaft 15, wherein the first barrel wall 12 is rotatably arranged on the connecting shaft 15, the second barrel wall 11 is fixedly connected with the connecting shaft 15, two ends of the connecting shaft 15 are rotatably arranged on a shell 21, handles 13 are fixedly arranged on one side surfaces, away from the connecting shaft 15, of the first barrel wall 12 and the second barrel wall 11, through holes are formed in the handles 13, the first bolt 14 is matched with the through holes, a rubber anti-skid layer covers the surface of each handle 13, and each handle 13 is made of cast iron;
the two ends of the clamping device 2 are respectively arranged in the first accommodating cavity 25 and the second accommodating cavity 251 in a sliding mode, and the clamping device 2 is used for clamping the bag opening when crops are bagged.
The working principle is as follows: after crops are harvested or aired, when the crops need to be bagged, the first barrel wall 12 and the second barrel wall 11 are closed, the first bolt 14 is inserted into the through hole in the handle 13, the bags are placed into the barrel, the bag openings are clamped by the clamping device 2, the crops are placed into the bags through manpower or machines, the bag openings are taken down from the clamping device when the bags are filled with the crops, the bag openings are tied tightly, then the first bolt 14 is taken down, the first barrel wall 12 and the second barrel wall 11 are opened, and the bags are taken out.
Example 2:
on the basis of embodiment 1, as shown in fig. 1 to 4, the clamping device 2 includes a first slider 22, a second slider 221, a first spring 24, a second spring 241, a connecting frame 211, a first clamping ring 26, a second clamping ring 28, and a second bolt 29, one end of the first slider 22 is hinged to the connecting frame 211, the other end is slidably disposed in the first accommodating cavity 25, one end of the first slider 22 located in the first accommodating cavity 25 is fixedly connected with a bump, one end of the first spring 24 is fixedly connected with the bump, and the other end is fixedly connected with the inner wall of the bottom end of the first accommodating cavity 25; one end of the second slider 221 is fixedly connected to one end of the connecting frame 211 far away from the first slider 22, the other end of the second slider is slidably arranged in the second accommodating cavity 251, one end of the second spring 241 abuts against one end of the second slider 221 in the second accommodating cavity 251, and the other end of the second spring is fixedly connected to the inner wall of the bottom end of the second accommodating cavity 251;
the first clamping ring 26 is fixedly connected with the connecting frame 211;
the connecting seat 27 is fixedly connected to the lower surface of the connecting frame 211 at one end of the first slider 22, the second clamping ring 28 is rotatably disposed on the connecting seat 27, the second clamping ring 28 includes a first clamping half ring 281 and a second clamping half ring 282, both the first clamping half ring 281 and the second clamping half ring 282 are rotatable, one ends of the first clamping half ring 281 and the second clamping half ring 282 at the second slider 221 can be overlapped in a crossing manner, both the first clamping half ring 281 and the second clamping half ring 282 at one end of the second slider 221 are provided with through holes, and the through holes are matched with the second bolts 29;
the outer diameter of the first gripper ring 26 is smaller than the inner diameter of the second gripper ring 28.
The outer surface of the first holding ring 26 is circumferentially provided with a groove 261, the inner surface of the second holding ring 28 is circumferentially provided with a rib 283, the rib 283 does not completely cover the second holding ring 28, and the groove 261 is matched with the rib 283.
The working principle is as follows: when crops need to be bagged, the second bolt 29 is pulled out, so that the first clamping half ring 281 and the second clamping half ring 282 can rotate, the first clamping half ring 281 and the second clamping half ring 282 are rotated to enable a larger gap to be reserved between the first clamping half ring 281 and the first clamping half ring 26, at the moment, a proper bag is selected and placed into the barrel, the bag mouth is used for wrapping the first clamping ring 26, then the second clamping ring 28 is closed, when the first clamping half ring 281 and the second clamping half ring 282 abut against the first clamping ring 26, the convex ridge 283 and the groove 261 are matched to clamp and fix the bag mouth, and the second bolt 29 is inserted after the bag is clamped. At this point, the bag can be filled with the crop to be filled, and as the crop initially enters the bag, the bag may be wrinkled, requiring a small amount of crop to compact and tighten the bag. At this time, the first spring 24 and the second spring 241 respectively arranged in the first accommodating cavity 25 and the second accommodating cavity 251 can effectively adjust the height of the clamping device 2 to give way, so that the bag can contact the bottom surface after being tensioned, so that all the weight is not concentrated on the bag opening, and the clamping device is difficult to stably clamp the bag opening.
Example 3:
on the basis of embodiment 1 or 2, as shown in fig. 1 to 9, a base 4 is fixedly connected to a bottom end of the housing 21, a first sliding groove 44 is formed in the base 4, a rack 441 is slidably disposed in the first sliding groove 44, a lower end of the connecting shaft 15 penetrates through a lower end of the housing 21 and is fixedly connected with a first connecting rod 151, a first gear 152 is fixedly connected to a lower end of the first connecting rod 151, and the first gear 152 is matched with the rack 441;
the base 4 comprises a supporting platform 30, a first supporting frame 32, a supporting seat 45 and a supporting device, wherein the supporting seat 45 is fixedly arranged at one end of the base 4, one end of the first supporting frame 32 is hinged to one end, close to the connecting shaft 15, of the supporting platform 30, and the other end of the first supporting frame is fixedly connected to the base 4;
a second sliding groove 41 is formed in the lower surface of one end, away from the first support frame 32, of the supporting platform 30, and a third sliding block 411 is slidably arranged in the second sliding groove 41; the supporting device comprises a second supporting frame 431, a sleeve 43 and a supporting rod 42, wherein the second supporting frame 431 is fixedly arranged on the base 4, the sleeve 43 is hinged on the second supporting frame 431, the supporting rod 42 is sleeved in the sleeve 43, one end of the supporting rod 42 is hinged on the third sliding block 411, and the other end of the supporting rod 42 is hinged on the rack 441.
A gear set and a plurality of anti-skid rollers 31 are arranged in the saddle 30, the anti-skid rollers 31 are rotatably arranged in the saddle 30 and are of incomplete structures, and anti-skid rubber layers are arranged on the surfaces of the anti-skid rollers 31; the gear set comprises a plurality of outer gear rings 311 and a plurality of second gears 312, the second gears 312 are rotatably arranged in the saddle 30, the outer gear rings 311 are fixedly arranged in the middle of the anti-skid rollers 31, the outer gear rings 311 are matched with the second gears 312, the number of the outer gear rings 311 and the number of the second gears 312 correspond to that of the anti-skid rollers 31 one by one, and the positions of the second gears 312 correspond to those of the outer gear rings 311 one by one;
a cavity 317 is formed in the supporting platform 30, a locking device is further arranged in the supporting platform 30 and comprises a stop block 314, a steel rope 316, a steel ball 313 and a jacking rod 315, the stop block 314 is arranged in the cavity 317 in a sliding mode, one end of the steel rope 316 is fixedly connected with the stop block 314, the other end of the steel rope is fixedly connected to the inner wall of the upper end of the cavity 317, the steel ball 313 is hinged to the bottom end of the outer wall of one side of the cavity 317, the jacking rod 315 is arranged in the supporting platform 30 in a sliding mode, one end of the jacking rod 315 is abutted to the lower end of the.
The support 45 is fixedly provided with a jacking table 451.
The working principle is as follows: when a proper amount of crops are filled in the bag, the bottom of the bag can abut against the tray table 30, the first barrel wall 12 and the second barrel wall 11 are closed, the supporting rod 42 connected with the lower end of the tray table 30 can support the tray table 30, so that the tray table 30 can support the bag, and when the bag is filled with the crops, the bag opening is taken down from the clamping device 2. At this time, the first barrel wall 12 and the second barrel wall 11 are opened, the second barrel wall 11 drives the connecting shaft 15 to rotate when rotating, the connecting shaft 15 drives the first gear 152 to rotate, the first gear 152 rotates to drive the rack 441 to move towards the connecting shaft 15, the rack 441 moves to drive the bottom end of the supporting rod 42 to move, the supporting rod 42 rotates around the sleeve 43, so that the pallet 30 hinged to the upper end of the supporting rod 42 loses the supporting force and rotates and inclines towards the direction of the support 45 under the action of gravity, the second barrel wall 11 can relatively control the rotating speed of the pallet 30 by meshing the first gear 152 and the rack 441, namely when the supporting rod 42 no longer supports the pallet 30, the force on the pallet 30 is transmitted to the first gear 152 through the supporting rod 42, namely transmitted to the second barrel wall 11, at this time, the handle on the second barrel wall can be forcefully held to slowly open the second barrel wall 11, the pallet 30 is slowly rotated.
In order to prevent the bag from possibly sliding off when the pallet 30 inclines due to the lack of friction force between the pallet 30 and the bottom end of the bag when the pallet 30 rotates, an anti-slip roller 31 for preventing slipping is arranged in the pallet 30, the anti-slip roller 31 is rotatable and provided with an anti-slip rubber layer on the surface, but when the pallet 30 does not completely rotate to the support position and is abutted against the support, the anti-slip roller 31 is locked by a locking device and cannot rotate; when the anti-skid roller 31 has a tendency to rotate, the outer gear rings 311 are blocked by the steel balls 313, the steel balls 313 are hinged in the supporting platform 30 and can be abutted by the stoppers 314 to be incapable of rotating, the outer gear rings 311 are fixedly connected with the anti-skid roller 31, and each outer gear ring 311 is meshed with the second gear 312, so that all the anti-skid rollers 31 can also be incapable of rotating, and further the effect of preventing the bag from sliding down is achieved, thereby better preventing the condition that the filled bag is damaged by crops in the bag or the worker is injured by smashing when the crops slide down due to the fact that the filled bag does not block direct sliding down, and protecting the worker.
When the supporting stand 30 is completely rotated to the position of the supporting stand 45, the jacking platform 451 arranged on the supporting stand can jack the jacking rod 315 upwards, the jacking rod 315 jacks the stop block 314 upwards, and the stop block 314 is easy to jack up under the action of external force because the inner wall surfaces of the stop block 314 and the cavity 317 are smooth. Therefore, the steel ball 313 can rotate and give way to the outer gear ring 311, all the anti-skid rollers 31 can rotate, and therefore when workers need to take out the bags filled with crops, the bags can be pulled outwards easily, and manpower consumption is reduced.
When the bag is removed, the first latch 14 is inserted to close the first barrel wall 12 and the second barrel wall 11, and the second barrel wall 11 drives the rack 441 to move toward the support 45, so that the pallet 30 is lifted up by the support bar 42, and the pallet 30 is horizontal when the two barrel walls are closed.
The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the embodiments, and any changes that can be considered by those skilled in the art shall fall within the protection scope of the present invention.

Claims (1)

1. An agricultural production auxiliary tool is characterized by comprising a shell (21), a barrel body (1) and a clamping device (2);
a first containing cavity (25) and a second containing cavity (251) are formed in the upper end of the shell (21);
the barrel body (1) comprises a first barrel wall (12), a second barrel wall (11), a first bolt (14) and a connecting shaft (15), the first barrel wall (12) is rotatably arranged on the connecting shaft (15), the second barrel wall (11) is fixedly connected with the connecting shaft (15), two ends of the connecting shaft (15) are rotatably arranged on the shell (21), one side surfaces, far away from the connecting shaft (15), of the first barrel wall (12) and the second barrel wall (11) are fixedly provided with handles (13), the handles (13) are respectively provided with a through hole, the first bolt (14) is matched with the through hole, the surface of each handle (13) is covered with a rubber anti-skid layer, and the handles (13) are made of cast iron;
the two ends of the clamping device (2) are slidably arranged in the first accommodating cavity (25) and the second accommodating cavity (251) respectively, and the clamping device (2) is used for clamping a bag opening when crops are bagged.
CN202021246353.7U 2020-06-30 2020-06-30 Agricultural production auxiliary tool Active CN213414449U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021246353.7U CN213414449U (en) 2020-06-30 2020-06-30 Agricultural production auxiliary tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021246353.7U CN213414449U (en) 2020-06-30 2020-06-30 Agricultural production auxiliary tool

Publications (1)

Publication Number Publication Date
CN213414449U true CN213414449U (en) 2021-06-11

Family

ID=76253696

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202021246353.7U Active CN213414449U (en) 2020-06-30 2020-06-30 Agricultural production auxiliary tool

Country Status (1)

Country Link
CN (1) CN213414449U (en)

Similar Documents

Publication Publication Date Title
CN111703669B (en) Use method of agricultural bagging auxiliary device
US8196938B2 (en) Modular mobile workstation with storage capacity
CN111703670B (en) Agricultural bagging-off auxiliary device
CN213414449U (en) Agricultural production auxiliary tool
CN111606270A (en) Anti-falling device of stacker
JP3190760U (en) Portable multi-purpose storage box
CN108792369B (en) Garden garbage bin
CN111717475B (en) Use method of agricultural auxiliary tool
AU2003266791A1 (en) Coil handler device
JP5954673B2 (en) Gripping device
CN215708405U (en) Environment-friendly insect-proof packaging woven bag
CN211110827U (en) Finished product lifting machine
CN111674667A (en) Agricultural auxiliary tool
CN205876235U (en) Automatic well workover machine people
CN214825401U (en) Soil gas storage device for geochemical exploration
CN210971834U (en) Movable bag opening frame suitable for various packaging bags
CN209920793U (en) Seal storage device for resident medical insurance
CN205858219U (en) Automatic Code bank of tubes puts one hydraulic leg
KR20100045562A (en) The device to carry tires
EP3941799A1 (en) Trolley and method for transporting and storing objects
JP2678256B2 (en) Conveyor with workbench
CN211491452U (en) Computer network tool box
CN212778617U (en) Filling device for vacuum smelting furnace
CN210133387U (en) Taking box for automatically exchanging sterile articles in ward
CN113080586B (en) Case and bag

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant