CN115231455A - Mechanical suspension device for building material manufacturing - Google Patents
Mechanical suspension device for building material manufacturing Download PDFInfo
- Publication number
- CN115231455A CN115231455A CN202210884506.8A CN202210884506A CN115231455A CN 115231455 A CN115231455 A CN 115231455A CN 202210884506 A CN202210884506 A CN 202210884506A CN 115231455 A CN115231455 A CN 115231455A
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- Prior art keywords
- plate
- groove
- fixedly connected
- rotatably connected
- suspension device
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- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
- B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
The invention discloses a mechanical suspension device for manufacturing building materials, which specifically comprises a bottom plate, wherein the top of the bottom plate is provided with a hidden groove, the top of the hidden groove is rotatably connected with a connecting seat, the outer surface of the connecting seat is rotatably connected with a driving shaft, the top of the connecting seat is fixedly connected with a fixing frame, and the outer surface of the connecting seat is rotatably connected with a transmission shaft; through the inside at the device be provided with the transmission shaft, the belt, lift by crane the mechanism, supporting mechanism and fixed establishment, with material rise after again with the top lift by crane between the arm fixed convey, when carrying out next time conveying, the top is carried fixed material, upwards the time production of conveying material and transport material overlaps, the transport speed to the material has been accelerated, wholly improve the conveying efficiency of equipment, the fixed equipment who sets up in the below of equipment in addition, utilize outside upset and ground to produce the resistance, central point in the equipment bottom puts and plays fixed effect, and can not cause the friction to the wheel of both sides.
Description
Technical Field
The invention relates to the technical field of cranes, in particular to a mechanical suspension device for manufacturing building materials.
Background
The crane is a hoisting and carrying machine widely used in ports, workshops, electric power, construction sites and other places. The name crane is a uniform title for hoisting machinery. The main of cranes are also truck cranes, crawler cranes and tyre cranes. The crane is used for hoisting equipment, rescuing, hoisting, mechanical and rescuing.
The existing mechanical suspension equipment has the disadvantages of long time consumption, low efficiency, high requirement on a lifting structure, repeated up-and-down movement and high loss on parts.
Disclosure of Invention
In order to solve the technical problems, the invention provides a mechanical suspension device for building material manufacturing, which has the problems of long time consumption, low efficiency, high requirement of equipment on a lifting structure, repeated up-and-down movement and high loss of parts, and is used for lifting, packaging and fixing.
In order to achieve the purpose, the invention is realized by the following technical scheme: the mechanical suspension device for manufacturing the building material specifically comprises,
the lifting device comprises a bottom plate, a connecting seat is rotatably connected to the top of the bottom plate, a driving shaft is rotatably connected to the outer surface of the connecting seat, a fixing frame is fixedly connected to the top of the connecting seat, a transmission shaft is rotatably connected to the outer surface of the connecting seat, the outer surface of the transmission shaft and the inner surface of the fixing frame are mutually penetrated, a belt is rotatably connected to the outer surface of the transmission shaft and the outer surface of the driving shaft, a circular groove is formed in the inner surface of the fixing frame, a lifting mechanism is arranged above the fixing frame, a square groove is formed in the top of the bottom plate, and a supporting mechanism is arranged on the outer surface of the square groove;
the outer surface of the bottom groove is formed in the bottom of the bottom plate, a fixing mechanism is fixedly connected to the inner surface of the bottom groove, fixing grooves are formed in the left side and the right side of the bottom plate, and idler wheels are rotatably connected to the inner surfaces of the fixing grooves; the transmission shaft, the belt, the lifting mechanism, the supporting mechanism and the fixing mechanism are arranged in the device, materials are fixedly conveyed between the lifting arms above the lifting mechanism after being lifted, the fixed materials are conveyed above the lifting mechanism while being conveyed next time, the materials are conveyed upwards and overlapped with the time for conveying the materials, and the conveying speed of the materials is accelerated.
The supporting mechanism comprises a slide way, the bottom of the slide way is arranged at the top of the square groove, the slide way is three, the inner surfaces of the slide ways on the left side and the right side are connected with two fixing frames in a sliding mode, and a lifting plate is connected between the outer surfaces of the two fixing frames in a sliding mode.
Preferably, the middle the internal surface sliding connection of slide has the screw thread bracing piece, the top of screw thread bracing piece and the bottom fixed connection of lifter plate, the slide rail has been seted up at the top of lifter plate.
Preferably, the equal sliding connection in the left and right sides of slide rail internal surface has the rotating turret, the top sliding connection of rotating turret has the backup pad, the top fixedly connected with interval platform of backup pad, the equal fixedly connected with link plate in the left and right sides of backup pad. Through supporting mechanism's use, be provided with screw thread bracing piece, backup pad and spacer table in supporting mechanism's inside, set up two faces on the transmission layer, the distance between the two can place the partly of equipment of lifting by crane.
Preferably, the hoisting mechanism comprises a bearing, the outer surface of the bearing is rotatably connected with the inner surface of the circular groove, the outer surface of the bearing is fixedly connected with a U-shaped frame, the top of the U-shaped frame is rotatably connected with a steering table, and the outer surface of the steering table is rotatably connected with a cross beam.
Preferably, the top of the cross beam is provided with a groove, the inner surface of the groove is connected with a sliding table in a sliding manner, the outer surface of the sliding table is fixedly connected with a vertical plate, the bottom of the vertical plate is fixedly connected with a side plate, the outer surface of the side plate is provided with a side groove, and the outer surface of the side plate is movably connected with the outer surface of the bottom frame.
Preferably, the left side and the right side of the vertical plate are both rotatably connected with knobs through mounting grooves, the inner surfaces of the knobs are connected with elastic rods in a penetrating manner, the outer surfaces of the elastic rods are fixedly connected with fixing half rings, and the outer surfaces of the fixing half rings are clamped and connected with the inner surfaces of the fixing half rings. Through the use of the hoisting mechanism, a structure for lifting the lower conveying device is arranged in the hoisting mechanism and is used for fixing the hoisting structure and the conveying structure.
Preferably, fixed establishment includes the underframe, the top of underframe and the internal surface fixed connection of kerve, the internal surface of underframe rotates through the main shaft and is connected with the inclined plane board, the right side fixedly connected with pulling force board of inclined plane board, the top of pulling force board and the bottom fixed connection of underframe.
Preferably, the bottom of the inclined plane plate is rotatably connected with a stop plate, and a damper is fixedly connected between the outer surface of the stop plate and the bottom of the bottom frame. Through the use of the fixing mechanism, the stop plate is arranged in the fixing mechanism, and the stop plate and the ground can generate resistance through outward turning of the stop plate and the ground, so that the equipment can be prevented from sliding under the condition of uneven ground.
The invention provides a mechanical suspension device for manufacturing building materials. The method has the following beneficial effects:
1. this mechanical suspension device is used in building material manufacturing, through the inside at the device be provided with the transmission shaft, the belt, lift by crane the mechanism, supporting mechanism and fixed establishment, with material rise height back again with the top lift by crane between the arm fixed convey, when carrying out next time conveying, the top is carried fixed material, upwards the time production of conveying material and transport material overlaps, the transport speed to the material has been accelerated, the transportation efficiency of equipment has wholly been improved, the fixed equipment that sets up in the below of equipment in addition, utilize outside upset and ground to produce the resistance, central point in the equipment bottom puts and plays fixed effect, and can not cause the friction to the wheel of both sides.
2. This mechanical hanging device is used in building material manufacturing, through supporting mechanism's use, be provided with screw thread bracing piece, backup pad and interval platform in supporting mechanism's inside, set up two faces at the transmission layer, the distance between the two can place the partly of lifting by crane equipment, is convenient for take over and fixed packing to the material, does not have the gap between the two when the transmission, and the material can not drop, has the security more.
3. According to the mechanical suspension device for manufacturing the building materials, through the use of the lifting mechanism, the structure for lifting the lower transmission device is arranged in the lifting mechanism and used for fixing the lifting structure and the transmission structure, the two mechanisms are aligned while the lifting structure is lifted to the plate surface, the material is prevented from being unstable in gravity center, and the functionality of equipment is improved.
4. According to the mechanical suspension device for manufacturing the building material, the stop plate is arranged in the fixing mechanism through the use of the fixing mechanism, and the stop plate and the ground generate resistance through outward overturning of the fixing mechanism and the ground, so that equipment is prevented from sliding under the condition of uneven ground, friction cannot be caused to tires, and the fixing capacity of the equipment is improved.
Drawings
FIG. 1 is a schematic view of the external structure of a mechanical suspension device for building material manufacture according to the present invention;
FIG. 2 is a bottom view of a mechanical suspension device for use in the manufacture of building materials in accordance with the present invention;
FIG. 3 is a schematic view of the external structure of the supporting mechanism of the present invention;
FIG. 4 is a schematic view of the external structure of the hoisting mechanism of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4A in accordance with the present invention;
fig. 6 is an external structural view of the fixing mechanism of the present invention.
In the figure: 1 bottom plate, 2 blind grooves, 3 connecting seats, 4 driving shafts, 5 fixing frames, 6 transmission shafts, 7 belts, 8 circular grooves, 9 hoisting mechanisms, 901 bearings, 902U-shaped frames, 903 steering tables, 904 cross beams, 905 grooves, 906 sliding tables, 907 vertical plates, 908 side plates, 909 side grooves, 910 underframe, 911 knobs, 912 elastic rods, 913 fixing half rings, 10 square grooves, 11 supporting mechanisms, 1101 slideways, 1102 fixing frames, 1103 lifting plates, 1104 threaded supporting rods, 1105 sliding rails, 1106 rotating frames, 1107 supporting plates, 1108 spacing tables, 1109 hanging plates, 12 bottom grooves, 13 fixing mechanisms, 1301 bottom frames, 1302 inclined plane plates, 1303 tension plates, 1304 stopping plates, 1305 dampers, 14 fixing grooves and 15 rollers.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
As shown in fig. 1 to 6, the present invention provides a technical solution: specifically, the method comprises the following steps of,
the device comprises a bottom plate 1, wherein a hidden groove 2 is formed in the top of the bottom plate 1, the top of the hidden groove 2 is rotatably connected with a connecting seat 3, the outer surface of the connecting seat 3 is rotatably connected with a driving shaft 4, a fixed frame 5 is fixedly connected to the top of the connecting seat 3, the outer surface of the connecting seat 3 is rotatably connected with a driving shaft 6, the outer surface of the driving shaft 6 is mutually penetrated through the inner surface of the fixed frame 5, a belt 7 is in transmission connection between the outer surface of the driving shaft 6 and the outer surface of the driving shaft 4, a circular groove 8 is formed in the inner surface of the fixed frame 5, a lifting mechanism 9 is arranged above the fixed frame 5, a square groove 10 is formed in the top of the bottom plate 1, and a supporting mechanism 11 is arranged on the outer surface of the square groove 10;
the outer surface of the bottom groove 12 is arranged at the bottom of the bottom plate 1, the inner surface of the bottom groove 12 is fixedly connected with a fixing mechanism 13, the left side and the right side of the bottom plate 1 are respectively provided with a fixing groove 14, and the inner surface of the fixing groove 14 is rotatably connected with a roller 15; the fixed equipment arranged below the equipment utilizes outward turning to generate resistance with the ground, plays a fixing effect at the central position of the bottom of the equipment and cannot cause friction to the wheels on two sides.
The supporting mechanism 11 comprises three slideways 1101, the bottoms of the slideways 1101 are arranged at the tops of the square grooves 10, the inner surfaces of the slideways 1101 on the left side and the right side are connected with two fixing frames 1102 in a sliding mode, and lifting plates 1103 are connected between the outer surfaces of the two fixing frames 1102 in a sliding mode.
The inner surface of the middle slideway 1101 is connected with a threaded support bar 1104 in a sliding manner, the top of the threaded support bar 1104 is fixedly connected with the bottom of the lifting plate 1103, and the top of the lifting plate 1103 is provided with a sliding rail 1105.
The left and right sides of the inner surface of the sliding rail 1105 are both connected with a rotating rack 1106 in a sliding manner, the top of the rotating rack 1106 is connected with a supporting plate 1107 in a sliding manner, the top of the supporting plate 1107 is fixedly connected with a spacing table 1108, and the left and right sides of the supporting plate 1107 are both connected with hanging plates 1109 in a fixed manner. The material is convenient to take over and fixed packing, and there is not the gap between the two when transmitting, and the material can not drop, has the security more.
The hoisting mechanism 9 comprises a bearing 901, the outer surface of the bearing 901 is rotatably connected with the inner surface of the circular groove 8, the outer surface of the bearing 901 is fixedly connected with a U-shaped frame 902, the top of the U-shaped frame 902 is rotatably connected with a steering table 903, and the outer surface of the steering table 903 is rotatably connected with a cross beam 904.
The top of the beam 904 is provided with a groove 905, the inner surface of the groove 905 is slidably connected with a sliding table 906, the outer surface of the sliding table 906 is fixedly connected with a vertical plate 907, the bottom of the vertical plate 907 is fixedly connected with a side plate 908, the outer surface of the side plate 908 is provided with a side groove 909, and the outer surface of the side plate 908 is movably connected with the outer surface of the bottom frame 910.
The left side and the right side of riser 907 are all connected with knob 911 through the mounting groove rotation, and the internal surface through connection of knob 911 has elastic rod 912, and the fixed half-circle 913 that is connected with of elastic rod 912's surface, and the external surface of fixed half-circle 913 and the internal surface card of fixed half-circle 913 are connected. The two mechanisms are aligned while the plate is lifted, so that the material is prevented from being unstable in fixed gravity center, and the functionality of the equipment is improved.
The fixing mechanism 13 comprises a bottom frame 1301, the top of the bottom frame 1301 is fixedly connected with the inner surface of the bottom groove 12, the inner surface of the bottom frame 1301 is rotatably connected with an inclined plane plate 1302 through a main shaft, the right side of the inclined plane plate 1302 is fixedly connected with a tension plate 1303, and the top of the tension plate 1303 is fixedly connected with the bottom of the bottom frame 1301.
The bottom of the inclined plane 1302 is rotatably connected with a stop plate 1304, and a damper 1305 is fixedly connected between the outer surface of the stop plate 1304 and the bottom of the bottom frame 1301. The equipment is prevented from sliding under the condition of uneven ground, the tires cannot be rubbed, and the fixing capacity of the equipment is improved.
When the device is used, when the device needs to be fixed, the inclined plane plate 1302 is rotated upwards to drive the inclined plane plate 1302 to be close to the inside of the bottom frame 1301, then the two stop plates 1304 are rotated outwards to be turned to the outer side, then the inclined plane plate 1302 is lowered to be closer to the ground, the two stop plates 1304 and the ground form supporting force, after the device is fixed, the two fixing frames 1102 are slid to be close to a lifting position, then the lifting plate 1103 is driven to lift upwards through a motor in the prior art, the movement is stopped after the lifting plate reaches a proper height position, the driving shaft 4 drives the belt 7 to move, the transmission shaft 6 drives the bearing 901 above to move, then the fixing angle of the steering table 903 can be adjusted left and right, then the cross beam 904 is guided downwards until the vertical plate 907 is close to the upper part of the spacing table 1108, the fixing half rings 913 and the hanging plates 1109 on the two sides are clamped and connected with each other, the supporting plate is driven to lift upwards, then the bottom frame 910 is placed between the spacing table 1108 and the supporting plate 1107, a batch of materials originally placed above the spacing table 1108 is taken out, the bottom frame 910 is replaced by the bottom frame 910, then the rope 1107, and a batch of the supporting mechanism 11 is suspended below the supporting mechanism is continuously conveyed.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by one of ordinary skill in the art and related arts based on the embodiments of the present invention without any creative effort, shall fall within the protection scope of the present invention. Structures, devices, and methods of operation not specifically described or illustrated herein are generally practiced in the art without specific recitation or limitation.
Claims (8)
1. A mechanical suspension device for manufacturing building materials is characterized in that: specifically, the method comprises the following steps of,
the lifting device comprises a bottom plate (1), wherein a hidden groove (2) is formed in the top of the bottom plate (1), a connecting seat (3) is rotatably connected to the top of the hidden groove (2), a driving shaft (4) is rotatably connected to the outer surface of the connecting seat (3), a fixed frame (5) is fixedly connected to the top of the connecting seat (3), a transmission shaft (6) is rotatably connected to the outer surface of the connecting seat (3), the outer surface of the transmission shaft (6) and the inner surface of the fixed frame (5) are mutually penetrated, a belt (7) is rotatably connected to the outer surface of the transmission shaft (6) and the outer surface of the driving shaft (4), a circular groove (8) is formed in the inner surface of the fixed frame (5), a lifting mechanism (9) is arranged above the fixed frame (5), a square groove (10) is formed in the top of the bottom plate (1), and a supporting mechanism (11) is arranged on the outer surface of the square groove (10);
the outer surface of the bottom groove (12) is arranged at the bottom of the bottom plate (1), the inner surface of the bottom groove (12) is fixedly connected with a fixing mechanism (13), the left side and the right side of the bottom plate (1) are respectively provided with a fixing groove (14), and the inner surface of each fixing groove (14) is rotatably connected with a roller (15);
supporting mechanism (11) include slide (1101), the top in square groove (10) is seted up to the bottom of slide (1101), slide (1101) are provided with threely, and wherein the equal sliding connection of the internal surface of the slide (1101) of the left and right sides has mount (1102), mount (1102) are provided with two, two sliding connection has lifter plate (1103) between the surface of mount (1102).
2. The mechanical suspension device for building material manufacture according to claim 1, wherein: the inner surface of the slideway (1101) is connected with a threaded supporting rod (1104) in a sliding mode, the top of the threaded supporting rod (1104) is fixedly connected with the bottom of the lifting plate (1103), and the top of the lifting plate (1103) is provided with a sliding rail (1105).
3. The mechanical suspension device for building material manufacture according to claim 2, wherein: the utility model discloses a slide rail (1105) is characterized in that the equal sliding connection in both sides of slide rail (1105) internal surface has a rotating turret (1106), the top sliding connection of rotating turret (1106) has a backup pad (1107), the top fixedly connected with interval platform (1108) of backup pad (1107), the equal fixedly connected with link plate (1109) in both sides of backup pad (1107).
4. The mechanical suspension device for building material manufacture according to claim 1, wherein: the lifting mechanism (9) comprises a bearing (901), the outer surface of the bearing (901) is rotatably connected with the inner surface of the circular groove (8), the outer surface of the bearing (901) is fixedly connected with a U-shaped frame (902), the top of the U-shaped frame (902) is rotatably connected with a steering table (903), and the outer surface of the steering table (903) is rotatably connected with a cross beam (904).
5. The mechanical suspension device for building material manufacture according to claim 4, wherein: the top of the beam (904) is provided with a groove (905), the inner surface of the groove (905) is connected with a sliding table (906) in a sliding mode, the outer surface of the sliding table (906) is fixedly connected with a vertical plate (907), the bottom of the vertical plate (907) is fixedly connected with a side plate (908), the outer surface of the side plate (908) is provided with a side groove (909), and the outer surface of the side plate (908) is movably connected with the outer surface of the bottom frame (910).
6. The mechanical suspension device for building material manufacture according to claim 5, wherein: the left side and the right side of the vertical plate (907) are respectively and rotatably connected with a knob (911) through a mounting groove, the inner surface of the knob (911) is connected with an elastic rod (912) in a penetrating mode, the outer surface of the elastic rod (912) is fixedly connected with a fixed half-ring (913), and the outer surface of the fixed half-ring (913) is clamped and connected with the inner surface of the fixed half-ring (913).
7. The mechanical suspension device for building material manufacture according to claim 1, wherein: the fixing mechanism (13) comprises a bottom frame (1301), the top of the bottom frame (1301) is fixedly connected with the inner surface of the bottom groove (12), the inner surface of the bottom frame (1301) is rotatably connected with an inclined plate (1302) through a main shaft, the right side of the inclined plate (1302) is fixedly connected with a tension plate (1303), and the top of the tension plate (1303) is fixedly connected with the bottom of the bottom frame (1301).
8. The mechanical suspension device for building material manufacture according to claim 7, wherein: the bottom of the inclined plane plate (1302) is rotatably connected with a stop plate (1304), and a damper (1305) is fixedly connected between the outer surface of the stop plate (1304) and the bottom of the bottom frame (1301).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210884506.8A CN115231455A (en) | 2022-07-25 | 2022-07-25 | Mechanical suspension device for building material manufacturing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210884506.8A CN115231455A (en) | 2022-07-25 | 2022-07-25 | Mechanical suspension device for building material manufacturing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115231455A true CN115231455A (en) | 2022-10-25 |
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ID=83675078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210884506.8A Withdrawn CN115231455A (en) | 2022-07-25 | 2022-07-25 | Mechanical suspension device for building material manufacturing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115231455A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116692650A (en) * | 2023-07-27 | 2023-09-05 | 南通泰胜蓝岛海洋工程有限公司 | Wind-powered electricity generation jacket hoist and mount are with energy-conserving supplementary hanging beam device |
-
2022
- 2022-07-25 CN CN202210884506.8A patent/CN115231455A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116692650A (en) * | 2023-07-27 | 2023-09-05 | 南通泰胜蓝岛海洋工程有限公司 | Wind-powered electricity generation jacket hoist and mount are with energy-conserving supplementary hanging beam device |
| CN116692650B (en) * | 2023-07-27 | 2023-11-17 | 南通泰胜蓝岛海洋工程有限公司 | Wind-powered electricity generation jacket hoist and mount are with energy-conserving supplementary hanging beam device |
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Application publication date: 20221025 |
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| WW01 | Invention patent application withdrawn after publication |