CN218666667U - Moth cloth disinfection belt cleaning device - Google Patents

Moth cloth disinfection belt cleaning device Download PDF

Info

Publication number
CN218666667U
CN218666667U CN202222631488.0U CN202222631488U CN218666667U CN 218666667 U CN218666667 U CN 218666667U CN 202222631488 U CN202222631488 U CN 202222631488U CN 218666667 U CN218666667 U CN 218666667U
Authority
CN
China
Prior art keywords
moth
cloth
clamping
rotating shaft
outlet pipe
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
CN202222631488.0U
Other languages
Chinese (zh)
Inventor
文小淋
宾荣佩
李安华
李�杰
毛丽丽
廖芬丽
汤庆坤
吴定刚
贾雪峰
邓荣烈
蓝必忠
包卓婷
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.)
Binyang County Agricultural And Rural Comprehensive Service Center
Original Assignee
Binyang County Agricultural And Rural Comprehensive Service Center
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 Binyang County Agricultural And Rural Comprehensive Service Center filed Critical Binyang County Agricultural And Rural Comprehensive Service Center
Priority to CN202222631488.0U priority Critical patent/CN218666667U/en
Application granted granted Critical
Publication of CN218666667U publication Critical patent/CN218666667U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Cleaning In General (AREA)

Abstract

The utility model discloses a moth cloth disinfection belt cleaning device, include: the water heating mechanism is provided with a water tank and a heating assembly, wherein a water outlet pipe I is arranged on the water tank, and a valve is arranged on the water outlet pipe I; a cleaning mechanism, comprising: the top of the cylinder is open, a water outlet pipe II and a water inlet pipe communicated with the water outlet pipe I are arranged on the cylinder, and valves are arranged on the water outlet pipe II and the water inlet pipe; each pair of brushes is oppositely arranged in the cylinder body, a circular arc-shaped brushing gap is formed between each pair of brushes, and the brushing gaps are positioned on the same circular track; the rotating shaft is rotatably arranged in the cylinder body and is coaxial with the brushing gap, a fixing frame is sleeved on the rotating shaft, a plurality of clamping pieces are arranged on the fixing frame at intervals and are located in the brushing gap, and the rotating shaft is driven to rotate by a driving piece. The utility model discloses have and carry out high temperature disinfection and abluent beneficial effect simultaneously.

Description

Moth cloth disinfection belt cleaning device
Technical Field
The utility model relates to a silkworm improved variety breeds technical field. More specifically, the utility model relates to a moth cloth disinfection belt cleaning device.
Background
In the first generation hybrid breeding process of silkworm, silkworm pupa will use a great amount of moth cloth, and silkworm moth will urinate on the moth cloth and release sex hormone, and after use, it needs to be washed. In order to clean the moth urine, sex hormone and moth hair on the moth cloth, hot water with the temperature of more than 80 ℃ is used for disinfection in the cleaning process. The moth cloth is cleaned by boiling water in an iron pan, taking out, cleaning with water, wringing, and drying in the sun. Therefore, the moth cloth is cleaned, and time and labor are wasted. The existing washing machine has limited capacity, cannot accommodate a large amount of moth cloth at the same time, is easy to wind together and not easy to wash cleanly in the washing process, and most importantly, the water temperature can only reach 60 ℃ at most, and the actual production requirement cannot be met. Therefore, the design of a moth cloth disinfection and cleaning line is a difficult problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to solve at least the above problems and to provide at least the advantages which will be described later.
In order to achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a moth cloth sterilizing and cleaning device, comprising:
the water heating mechanism is provided with a water tank and a heating assembly for heating water in the water tank to above 90 ℃, the water tank is provided with a water outlet pipe I, and the water outlet pipe I is provided with a valve;
a cleaning mechanism, comprising:
the top of the cylinder is open, a water outlet pipe II and a water inlet pipe communicated with the water outlet pipe I are arranged on the cylinder, and valves are arranged on the water outlet pipe II and the water inlet pipe;
each pair of brushes is oppositely arranged in the cylinder body, a circular arc-shaped brushing gap is formed between each pair of brushes, and the brushing gaps are positioned on the same circular track;
the rotating shaft is rotatably arranged in the cylinder body and is coaxial with the brushing gap, a fixing frame is sleeved on the rotating shaft, a plurality of clamping pieces are arranged on the fixing frame at intervals, the clamping pieces are located in the brushing gap, the upper ends of the clamping pieces are higher than the upper end of the hairbrush, and the rotating shaft is driven to rotate by a driving piece.
Preferably, each pair of brushes comprises an arc-shaped outer brush with a larger diameter and an inner brush with a smaller diameter, the plurality of pairs of brushes share the same cylindrical inner brush, and the plurality of outer brushes are arranged at intervals.
Preferably, the fixing frame includes:
the fixed sleeve is sleeved on the rotating shaft;
one end of each fixing rod is fixed on the side wall of the fixing sleeve at intervals, the other end of each fixing rod is used for fixing the clamping piece, and the fixing rods are higher than the upper end of the hairbrush;
and a connection ring fixed to the bottoms of the plurality of clamping members.
Preferably, the holder includes:
the side surface of the clamping sleeve is fixed on the fixed frame, a notch is formed in the radially outward side surface of the clamping sleeve, and the width of the notch is smaller than the radial width of the clamping sleeve;
the clamping part comprises a long flat plate and a plurality of spring clamps arranged on the long flat plate at intervals, the long flat plate and the pressing end of each spring clamp are sleeved in the clamping sleeve in a clearance mode, and the long flat plate and the clamping end of each spring clamp are sleeved on the notch in a clearance mode.
Preferably, the bottom of the long flat plate is provided with a positioning bulge, the bottom of the clamping sleeve is provided with a positioning groove, and the positioning bulge is inserted into the positioning groove.
Preferably, the apparatus further comprises a stopper including:
the limiting rod is arranged on the top rod of the long flat plate, and the top of the limiting rod is provided with a limiting baffle plate with the diameter larger than that of the limiting rod;
the sliding sleeve is sleeved on the limiting rod in a sliding manner up and down;
one end of the pull rod is hinged to the sliding sleeve, the pull rod rotates up and down, and a sleeve ring is arranged at the free end of the pull rod;
the top of the rotating shaft is provided with a plurality of convex rods, wherein the lantern ring is sleeved on the convex rods in a clearance mode.
Preferably, the driving member includes a motor and a speed reducer having an input end connected to an output shaft of the motor, wherein an output end of the speed reducer is connected to the rotating shaft.
Preferably, the device further comprises a bracket, the bracket is erected above the cylinder body, and the driving piece is fixed on the bracket.
Preferably, the cylinder has a diameter of 1.2 to 1.8m and a height of 0.8 to 1.2m.
Preferably, the outer wall of the cylinder body is coated with a heat insulation layer.
The utility model discloses at least, include following beneficial effect: can make moth cloth carry out two-sided washing simultaneously with the state that the tiling was expanded between the brush to and carry out high temperature disinfection simultaneously, show and improve disinfection cleaning efficiency, satisfy the disinfection cleaning requirement of moth cloth.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic side view of the cleaning device according to one embodiment of the present invention;
fig. 2 is a top view of the cleaning mechanism according to one embodiment of the present invention;
fig. 3 is a top view of the fixing frame according to one embodiment of the present invention;
fig. 4 is a side view of the fixing frame according to one embodiment of the present invention;
fig. 5 is a detailed view of the clamping portion according to one embodiment of the present invention;
fig. 6 is a detailed view of the brush according to one of the technical solutions of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1-6, the utility model provides a moth cloth disinfection belt cleaning device, include:
the water heating mechanism is provided with a water tank 1 and a heating assembly for heating water in the water tank 1 to a temperature higher than 90 ℃, a water outlet pipe I11 is arranged on the water tank 1, and a valve is arranged on the water outlet pipe I11; the hot water mechanism usually adopts an electric water heater, such as a commercial electric water heater, and has large capacity and accurate temperature control.
A purge mechanism, comprising:
the top of the cylinder body 2 is open, a water outlet pipe II 21 and a water inlet pipe 22 communicated with the water outlet pipe I11 are arranged on the cylinder body 2, and valves are arranged on the water outlet pipe II 21 and the water inlet pipe 22; the water outlet pipe I11 and the water inlet pipe 22 can be connected by adopting a hose or a hard pipe, and when valves on the water outlet pipe I11 and the water inlet pipe 22 are opened, hot water can enter the barrel body 2 from the water tank 1.
The pair of brushes 3 is oppositely arranged in the cylinder body 2, an arc-shaped brushing gap is formed between each pair of brushes 3, the brushing gap is positioned on the same circular track, when the moth cloth is cleaned, the moth cloth does circular motion along the brushing gap, the moth cloth is brushed by the pair of brushes 3 in the motion process, and the bristles 302 of the brushes 3 are flexible to a certain extent, so that the rotation of the moth cloth cannot be blocked;
the rotating shaft 4 is rotatably arranged in the barrel 2, the rotating shaft 4 and the washing gap are coaxially arranged, a fixing frame 5 is sleeved on the rotating shaft 4, a plurality of clamping pieces 6 are arranged on the fixing frame 5 at intervals, the clamping pieces 6 are located in the washing gap, the upper ends of the clamping pieces 6 are higher than the upper ends of the brushes 3, and the rotating shaft 4 is driven to rotate by a driving piece 7. The rotating shaft 4 rotates under the action of the driving piece 7, the fixing frame 5 is driven to rotate, the fixing frame 5 drives the clamping piece 6 to rotate, one side of the clamping piece 6, which is horizontally paved in the vertical direction, is clamped on the moth cloth, along with the rotation of the clamping piece 6, the moth cloth is gradually brought into a washing gap from the gap between every two adjacent pairs of hairbrushes 3, after the moth cloth is rotated for a plurality of weeks, the cleaning of the moth cloth can be finished, the cleaning speed is high, and the disinfection operation is completed simultaneously. The clamping member 6 can be formed by vertically fixing a plurality of spring clips 504 on a plate body side by side at intervals to form a clamping member 6 which is adaptive to the size of the moth cloth. The moth fixing device can also be arranged into a rod body, the bottom of the rod body is fixed on the fixing frame 5, then a cloth sleeve is arranged on the moth cloth, and when the moth cloth is fixed, the cloth sleeve is only required to be sleeved on the rod body. The drive member 7 may be a waterproof motor.
In the technical scheme, the moth cloth is clamped and fixed on the clamping piece 6, the valve on the water outlet pipe I11 with prepared hot water is opened, the valve on the water inlet pipe 22 is opened, the hot water enters the barrel body 2, the moth cloth is disinfected by the hot water on one hand, and after the moth cloth is submerged on the other hand, the driving piece 7 is started to drive the rotating shaft 4 to rotate, so that the fixing piece and the clamping piece 6 are driven to rotate, the moth cloth enters a washing gap and is washed by the brush 3, the two sides of the moth cloth are washed simultaneously, the cleaning efficiency is high, the washing can be completed only by running for a plurality of weeks, and the disinfection is completed.
In another technical scheme, each pair of the brush 3 comprises an arc-shaped outer brush 31 with a larger diameter and an inner brush 32 with a smaller diameter, a plurality of pairs of the brush 3 share the same cylindrical inner brush 32, and the outer brushes 31 are arranged at intervals. The inner brush 32 is cylindrical, can play a role in blocking, prevents moth cloth from entering the rotating shaft 4 and being wound with other parts, can increase the brushing area and improve the cleaning efficiency.
In another technical solution, the fixing frame 5 includes:
a fixing sleeve 51 sleeved on the rotating shaft 4;
a plurality of fixing rods 52, one ends of the fixing rods 52 are fixed on the side wall of the fixing sleeve 51 at intervals, the other ends of the fixing rods 52 fix the clamping piece 6, and the fixing rods 52 are higher than the upper end of the brush 3;
and a connection ring 53 fixed to the bottom of the plurality of clamps 6.
In the technical scheme, the moth cloth can be subjected to the washing force of the brush 3 in the process of circular motion, so that a certain pulling force can be caused on the fixing frame 5, and the structure is arranged for ensuring that the fixing frame 5 is firmer and preventing the clamping piece 6 from inclining. The upper side is fixed with the rotating shaft 4 through the fixing sleeve 51 to transmit the rotating force, and is fixed with the rotating shaft 4 more stably, and the fixing rod 52 is fixed firmly with the fixing sleeve 51. The bottoms of the plurality of holding members 6 are fixed to the same connecting ring 53 so that the bottoms of the holding members 6 are connected to each other and formed in a closed shape to prevent inclination.
In another solution, the clamp 6 comprises:
a side surface of the clamping sleeve 501 is fixed on the fixing frame 5, a gap is formed in the radially outward side surface of the clamping sleeve 501, and the width of the gap is smaller than the radial width of the clamping sleeve 501;
the clamping portion 502 comprises a long flat plate 503 and a plurality of spring clamps 504 arranged on the long flat plate 503 at intervals, the long flat plate 503 and the pressing ends of the spring clamps 504 are sleeved in the clamping sleeve 501 in a clearance mode, and the long flat plate 503 and the clamping ends of the spring clamps 504 are sleeved on the notch in a clearance mode. Frequent dress and dismantlement are required when moth cloth washs to the water in the barrel 2 is hot water, inconvenient operation in the aquatic, consequently, designs one kind and can takes out, realizes the holder 6 of centre gripping outside barrel 2 and more is favorable to protecting the user. In the above technical scheme, the clamping portion 502 is taken out, one side edge of the moth cloth is sequentially fixed on the spring clamp 504, the upper side and the lower side of the moth cloth are located between the long flat plates 503, then the clamping portion 502 is placed back into the clamping sleeve 501, the moth cloth is soaked into the barrel body 2, and the outer edge side of the brush 3 is clamped and fixed.
In another technical scheme, a positioning protrusion 505 is disposed at the bottom of the long flat plate 503, a positioning groove 506 is disposed at the bottom of the clamping sleeve 501, and the positioning protrusion 505 is inserted into the positioning groove 506. First, the long flat plate 503 (the holding portion 502) can be accurately positioned, and second, the fixing reliability of the long flat plate 503 can be enhanced.
In another technical solution, the apparatus further includes a limiting member 8, which includes:
the limiting rod 81 is arranged on the rod at the top of the long flat plate 503, and the top of the limiting rod 81 is provided with a limiting baffle 82 with the diameter larger than that of the limiting rod 81;
the sliding sleeve 83 is sleeved on the limiting rod 81 in an up-and-down sliding manner;
one end of a pull rod 84 is hinged to the sliding sleeve 83, the pull rod 84 rotates up and down, and a sleeve ring 85 is arranged at the free end of the pull rod 84;
the top of the rotating shaft 4 is provided with a plurality of protruding rods 41, wherein the lantern ring 85 is sleeved on the protruding rods 41 with a clearance.
Because there is water in the cylinder 2, a certain buoyancy is formed, so that the position of the clamping part 502 is influenced, and the position of the moth cloth is influenced. In the above technical solution, by providing the limiting rod 81, the sliding sleeve 83, the pull rod 84, and the protruding rod 41, the upper side of the clamping portion 502 can be limited and fixed on the protruding rod 41, so as to stabilize the clamping portion 502, and the moth cloth is always located between the brushes 3 to be brushed.
In another technical solution, the driving member 7 includes a motor and a speed reducer having an input end connected to an output shaft of the motor, wherein an output end of the speed reducer is connected to the rotating shaft 4. When in brushing, the brush is only required to rotate slowly, and the high-speed rotation of the motor can be converted into low-speed rotation through the speed reducer.
In another technical scheme, the device further comprises a support 9 which is erected above the cylinder 2, and the driving part 7 is fixed on the support 9. Used for installing the driving piece 7 and is firmly fixed.
In another technical scheme, the diameter of the cylinder body 2 is 1.2-1.8 m, and the height is 0.8-1.2 m. In order to match the size of the moth cloth, the moth cloth can be brushed in a state of being spread as much as possible, and the cleaning efficiency is improved.
In another technical scheme, an insulating layer 23 is laid on the outer wall of the cylinder body 2. The heat-insulating layer 23 can be made of foam board or polyurethane heat-insulating board, etc., so as to reduce the heat loss of hot water in the cylinder 2.
In a technical scheme, the bristles 302 of the inner brush 32 and the outer brush 31 are detachably fixed, for example, a plurality of through holes are formed in the inner brush plate 301 of the inner brush 32, the bristles 302 are fixed on the soft cloth layer 303, a plurality of through holes are formed in the cloth layer 303, and then the through holes in the inner brush plate 301 and the through holes in the cloth layer 303 are fixed through bolts and nuts. When the cleaning function of the bristles 302 is not satisfactory, it is convenient to replace the bristles 302 with new ones.
Still include in a technical scheme, still include the hydroextractor, it is used for carrying out dewatering treatment with the moth cloth that washs, accelerates moth cloth's drying rate.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.

Claims (10)

1. Moth cloth disinfection belt cleaning device, its characterized in that includes:
the water heating mechanism is provided with a water tank and a heating assembly for heating water in the water tank to above 90 ℃, wherein a water outlet pipe I is arranged on the water tank, and a valve is arranged on the water outlet pipe I;
a cleaning mechanism, comprising:
the top of the cylinder is open, a water outlet pipe II and a water inlet pipe communicated with the water outlet pipe I are arranged on the cylinder, and valves are arranged on the water outlet pipe II and the water inlet pipe;
each pair of brushes is oppositely arranged in the cylinder body, a circular arc-shaped brushing gap is formed between each pair of brushes, and the brushing gaps are positioned on the same circular track;
the rotating shaft is rotatably arranged in the cylinder body and coaxially arranged with the brushing gap, a fixing frame is sleeved on the rotating shaft, a plurality of clamping pieces are arranged on the fixing frame at intervals and located in the brushing gap, the upper ends of the clamping pieces are higher than the upper end of the brush, and the rotating shaft is driven to rotate by a driving piece.
2. The moth cloth disinfecting and cleaning device of claim 1, wherein each pair of brushes comprises an outer brush with a cambered surface shape and an inner brush with a smaller diameter, the plurality of pairs of brushes share the same cylindrical inner brush, and the plurality of outer brushes are arranged at intervals.
3. The moth cloth disinfecting and cleaning apparatus of claim 1, wherein the holder comprises:
the fixed sleeve is sleeved on the rotating shaft;
one end of each fixing rod is fixed on the side wall of the fixing sleeve at intervals, the other end of each fixing rod is used for fixing the clamping piece, and the fixing rods are higher than the upper end of the hairbrush;
and a connection ring fixed to the bottoms of the plurality of clamping members.
4. The moth cloth disinfecting and cleaning apparatus of claim 1, wherein said holding member comprises:
the side surface of the clamping sleeve is fixed on the fixed frame, a notch is formed in the radially outward side surface of the clamping sleeve, and the width of the notch is smaller than the radial width of the clamping sleeve;
the clamping part comprises a long flat plate and a plurality of spring clamps arranged on the long flat plate at intervals, the long flat plate and the pressing end of each spring clamp are sleeved in the clamping sleeve in a clearance mode, and the long flat plate and the clamping end of each spring clamp are sleeved on the notch in a clearance mode.
5. The moth cloth disinfecting and cleaning device as claimed in claim 4, wherein a positioning protrusion is arranged at the bottom of the long flat plate, a positioning groove is arranged at the bottom of the clamping sleeve, and the positioning protrusion is inserted into the positioning groove.
6. The moth cloth disinfecting and cleaning apparatus of claim 4 further comprising a stopper comprising:
the limiting rod is arranged on the top rod of the long flat plate, and a limiting baffle with the diameter larger than that of the limiting rod is arranged at the top of the limiting rod;
the sliding sleeve is sleeved on the limiting rod in a sliding manner up and down;
one end of the pull rod is hinged to the sliding sleeve, the pull rod rotates up and down, and a sleeve ring is arranged at the free end of the pull rod;
the top of the rotating shaft is provided with a plurality of convex rods, wherein the lantern ring is sleeved on the convex rods in a clearance mode.
7. The moth cloth disinfecting and cleaning apparatus of claim 1, wherein the driving member comprises a motor and a decelerator of which an input end is connected to an output shaft of the motor, wherein an output end of the decelerator is connected to the rotating shaft.
8. The moth cloth disinfecting and cleaning device of claim 1, further comprising a bracket which is erected above the cylinder body, wherein the driving member is fixed on the bracket.
9. The moth cloth disinfecting and cleaning device of claim 1, wherein the diameter of the cylinder is 1.2-1.8 m, and the height is 0.8-1.2 m.
10. The moth cloth disinfecting and cleaning device of claim 1, wherein an insulating layer is laid on the outer wall of the cylinder body.
CN202222631488.0U 2022-10-08 2022-10-08 Moth cloth disinfection belt cleaning device Active CN218666667U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202222631488.0U CN218666667U (en) 2022-10-08 2022-10-08 Moth cloth disinfection belt cleaning device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202222631488.0U CN218666667U (en) 2022-10-08 2022-10-08 Moth cloth disinfection belt cleaning device

Publications (1)

Publication Number Publication Date
CN218666667U true CN218666667U (en) 2023-03-21

Family

ID=85562213

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202222631488.0U Active CN218666667U (en) 2022-10-08 2022-10-08 Moth cloth disinfection belt cleaning device

Country Status (1)

Country Link
CN (1) CN218666667U (en)

Similar Documents

Publication Publication Date Title
CN107960859A (en) A kind of Drinking fountain
CN218666667U (en) Moth cloth disinfection belt cleaning device
CN210561203U (en) Weaving equipment with belt cleaning device
CN109622529A (en) A kind of test tube cleaning device
CN211511660U (en) Cleaning dock
CN206204613U (en) For the brush of outer barrel gap cleaning in impeller automatic washing machine
CN210399546U (en) Household solar water heater with heat collecting pipes easy to clean
WO2010072046A1 (en) Multifunctional washing machine with clothes brushing function
CN216439346U (en) Automatic formula artificial tooth ultrasonic cleaning device
CN205989613U (en) A kind of cleaning device of portable fine arts drawing pen
CN210539620U (en) Sponge brush holder
CN209647151U (en) A kind of cleaning device of pigment staving
CN208447530U (en) Shoe washing machine
CN220611574U (en) Ultrasonic probe cleaning and sterilizing device
CN212746928U (en) Water temperature machine convenient to clean
CN216297429U (en) Blood branch of academic or vocational study is with blood collection test tube cleaning machine
CN213223250U (en) Wash screen cloth device
CN212260806U (en) Improved bed sweeping brush
CN213488615U (en) Sweeper brush cleaning device
CN212940836U (en) Cleaning tool for anorectal nursing
CN213613016U (en) B ultrasonic probe cleaning equipment
CN218128084U (en) Electric kettle convenient for removing scale
CN219965885U (en) Hydraulic cylinder's belt cleaning device
CN215236605U (en) Cleaning effect is good belt cleaning device of glassware for molecular biology
CN219836933U (en) Test tube cleaning device

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant