CN112832500A - Energy-conserving construction lift anti-falling device - Google Patents
Energy-conserving construction lift anti-falling device Download PDFInfo
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- CN112832500A CN112832500A CN202011633492.XA CN202011633492A CN112832500A CN 112832500 A CN112832500 A CN 112832500A CN 202011633492 A CN202011633492 A CN 202011633492A CN 112832500 A CN112832500 A CN 112832500A
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- lifting frame
- lifting
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/18—Scaffolds primarily resting on the ground adjustable in height
- E04G1/20—Scaffolds comprising upright members and provision for supporting cross-members or platforms at different positions therealong
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/001—Safety or protective measures against falling down relating to scaffoldings
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Types And Forms Of Lifts (AREA)
Abstract
The invention provides an energy-saving lifting anti-falling device for building construction, which relates to the technical field of building construction equipment and solves the problems that after a steel wire rope is broken, a lifting frame is easy to fall rapidly to cause casualties, and the locking of the lifting frame can not be automatically realized when the steel wire rope is suddenly broken through structural improvement; the manual locking structure has low adjusting efficiency and cannot realize automatic locking after adjustment. An energy-saving building construction lifting anti-falling device comprises a frame body; the lifting frame is connected with the frame body in a sliding mode, a steel wire rope is connected onto the lifting frame, and a protection structure is installed on the lifting frame. Because of stress rod and wire rope elastic contact, and be the joint state when stress rod is located initial position between joint piece and the dog to stress rod elasticity resets to initial position after wire rope fracture, and then can realize the quick shutting of lift frame through the cooperation between joint piece and the dog.
Description
Technical Field
The invention belongs to the technical field of building construction equipment, and particularly relates to an energy-saving building construction lifting anti-falling device.
Background
Since the 90 s, the building structure system in China has been greatly developed, along with social progress, the construction of building engineering is more and more, in the building construction, the building engineering with less than ten floors is the most construction engineering, the material transportation of the engineering mainly depends on the steel wire rope type construction elevator, and people can work more efficiently, such as carrying work and the like, by using the construction elevator.
As in application No.: the energy-saving lifting anti-falling device for building construction comprises a lifting box body, guide rails are arranged on two sides of the lifting box body, a brake cylinder is connected to the upper ends of the inner walls of the two sides of the lifting box body in a penetrating mode, a sliding plug is arranged in an inner cavity of one end of the brake cylinder, one end of the sliding plug penetrates through an inner cavity of the brake cylinder and extends to one side of the lifting box body, a friction block is fixedly connected to one end of the sliding plug, one side of the friction block is connected with one side of the guide rails in a laminating mode, and an anti-falling cylinder is arranged above the brake cylinder. According to the invention, the two side walls of the lifting box body are respectively provided with the brake cylinders, one end of each brake cylinder is provided with the friction block, one side of each friction block is attached to one side of the guide rail, and force is applied to the friction blocks to generate friction between the friction blocks and the guide rail, so that the braking effect is generated on the lifting box body, and the safety performance of the device can be effectively improved.
The energy-saving building lifting device similar to the above application has the following defects at present:
one is that the existing device has lower safety performance, has no protective structure when the lifting frame is driven to lift by the steel wire rope, easily causes the lifting frame to fall rapidly to cause casualties after the steel wire rope is broken, and can not automatically realize the locking of the lifting frame when the steel wire rope is suddenly broken through structural improvement; moreover, the manual locking structure on the existing device has low adjusting efficiency, and automatic locking cannot be realized after adjustment.
Therefore, in view of the above, research and improvement are made for the existing structure and defects, and an energy-saving building construction lifting anti-falling device is provided, so as to achieve the purpose of higher practical value.
Disclosure of Invention
In order to solve the technical problems, the invention provides an energy-saving lifting anti-falling device for building construction, aiming at solving the problems that the existing device has lower safety performance, has no protective structure when a lifting frame is driven by a steel wire rope to lift, easily causes the lifting frame to fall rapidly to cause casualties after the steel wire rope is broken, and can not automatically realize the locking of the lifting frame when the steel wire rope is suddenly broken through structural improvement; moreover, the manual locking structure on the existing device has low adjusting efficiency and cannot realize automatic locking after adjustment.
The invention relates to an energy-saving building construction lifting anti-falling device, which is achieved by the following specific technical means:
an energy-saving building construction lifting anti-falling device comprises a frame body; the lifting frame is connected with the steel wire rope in a sliding manner, and a protection structure is arranged on the lifting frame; the protection structure comprises a clamping block, the clamping block is welded on the sliding rod, and the clamping block is aligned with the stop block; the width of the clamping block is smaller than the width between the two stop blocks, and the stop blocks form a limiting structure of the clamping block; the protection structure further comprises a stress rod, the stress rod is welded on the stress seat, and the stress rod is of a cylindrical rod-shaped structure; stress rod and wire rope elastic contact, and be the joint state when stress rod is located initial position between joint piece and the dog.
Furthermore, the frame body comprises two seat plates and a supporting seat, the two seat plates are symmetrically welded on the frame body, and the two seat plates are both in rectangular plate structures; and each seat plate is symmetrically and spirally connected with a supporting seat, and the supporting seats form a horizontal supporting structure of the seat plate.
Furthermore, the frame body also comprises four through holes, and the four through holes are respectively formed in the four supporting seats; the four through holes are of circular hole-shaped structures, and the through holes form a fixing structure of the supporting seat.
Furthermore, the lifting frame comprises a rotating seat, an adjusting rod and a mounting seat, the rotating seat is welded on the lifting frame, and the rotating seat is rotatably connected with the adjusting rod; the head end and the tail end of the adjusting rod are respectively in threaded connection with a mounting seat, and the mounting seats are in contact with the lifting frame; the screw thread direction of adjusting rod head end and tail end is opposite, and the adjusting rod has constituteed the synchronous reverse regulation structure of two mount pads.
Furthermore, the rack body also comprises clamping grooves, the clamping grooves are formed in the rack body in a rectangular array shape, and the clamping grooves are in a rectangular groove-shaped structure; the lifting frame further comprises two locking blocks, and the two locking blocks are welded on the two mounting seats respectively; the locking block is matched with the clamping groove, and the locking block and the clamping groove jointly form a manual adjustment locking structure of the lifting frame.
Furthermore, the lifting frame also comprises a gear and an adjusting rod, and the gear is arranged on the adjusting rod; the adjusting rod is rotatably connected to the lifting frame and is provided with spiral teeth; the spiral teeth arranged on the adjusting rod are meshed with the gear, and the adjusting rod and the gear form a worm and gear structure together.
Further, the rack body also comprises a roller, a seat body and a stop block, the roller is welded on the rack body, and the steel wire rope passes through the roller; the two seat bodies are symmetrically welded on the frame body; the two seat bodies are welded with the stop blocks in a rectangular array shape, the stop blocks are in rectangular block structures, and the seat bodies are in L-shaped plate structures.
Furthermore, the protection structure comprises a sliding block, a sliding rod, a stress seat and an elastic piece, wherein the sliding block is welded on the lifting frame, the sliding block is connected with the sliding rod in a sliding manner, and the tail end of the sliding rod is welded with the stress seat; the elastic piece is sleeved on the sliding rod, and the elastic piece forms an elastic reset structure of the stress seat and the sliding rod.
Compared with the prior art, the invention has the following beneficial effects:
through wire rope and protection architecture's cooperation setting, can realize the automatic shutting of lift frame through protection architecture after wire rope fracture, specifically go into down: firstly, a sliding block is welded on the lifting frame, the sliding block is connected with a sliding rod in a sliding manner, and the tail end of the sliding rod is welded with a stress seat; the elastic piece is sleeved on the sliding rod and forms a stress seat and an elastic reset structure of the sliding rod; secondly, the clamping block is welded on the sliding rod and aligned with the stop block; the width of the clamping block is smaller than the width between the two stop blocks, and the stop blocks form a limiting structure of the clamping block, so that the lifting frame can be quickly locked through limiting clamping between the stop blocks and the clamping block; and thirdly, due to the elastic contact of the stress rod and the steel wire rope, the stress rod is in a clamping state between the clamping block and the stop block when being located at the initial position, so that the stress rod is elastically reset to the initial position after the steel wire rope is broken, and the quick locking of the lifting frame can be realized through the matching between the clamping block and the stop block.
Through the arrangement of the lifting frame, firstly, the head end and the tail end of the adjusting rod are respectively in threaded connection with a mounting seat, and the mounting seats are in contact with the lifting frame; the thread directions of the head end and the tail end of the adjusting rod are opposite, and the adjusting rod forms a synchronous reverse adjusting structure of the two mounting seats, so that the adjusting efficiency of the mounting seats can be improved; secondly, two locking blocks are arranged and are respectively welded on the two mounting seats; the locking block is matched with the clamping groove, and the locking block and the clamping groove jointly form a manual adjustment locking structure of the lifting frame; thirdly, the gear is arranged on the adjusting rod; the adjusting rod is rotationally connected to the lifting frame and is provided with spiral teeth; the spiral teeth arranged on the adjusting rod are meshed with the gear, and the adjusting rod and the gear form a worm and gear structure together, so that automatic locking after adjustment of the adjusting rod can be realized.
Drawings
Fig. 1 is a schematic axial view of the present invention.
Fig. 2 is an enlarged schematic view of fig. 1 at a.
Fig. 3 is an enlarged schematic view of fig. 1 at B according to the present invention.
Fig. 4 is a schematic axial view of the present invention in another direction of fig. 1.
Fig. 5 is an enlarged view of the structure of fig. 4C according to the present invention.
Fig. 6 is a schematic top view of the lift frame and protective structure of the present invention.
Fig. 7 is an enlarged view of fig. 6D according to the present invention.
Fig. 8 is an enlarged view of fig. 6E according to the present invention.
In the drawings, the corresponding relationship between the component names and the reference numbers is as follows:
1. a frame body; 101. a seat plate; 102. a supporting seat; 103. a through hole; 104. a card slot; 105. a roller; 106. a base body; 107. a stopper; 2. a lifting frame; 201. a rotating seat; 202. an adjusting lever; 203. a mounting seat; 204. a locking block; 205. a gear; 206. adjusting a rod; 3. a wire rope; 4. a protective structure; 401. a slider; 402. a slide bar; 403. a stressed seat; 404. an elastic member; 405. a clamping block; 406. a stress rod.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
as shown in figures 1 to 8:
the invention provides an energy-saving building construction lifting anti-falling device, which comprises a frame body 1; a lifting frame 2 is connected in the frame body 1 in a sliding manner, a steel wire rope 3 is connected on the lifting frame 2, and a protection structure 4 is arranged on the lifting frame 2; referring to fig. 6 and 7, the protection structure 4 includes a clamping block 405, the clamping block 405 is welded on the sliding rod 402, and the clamping block 405 is aligned with the stopper 107; the width of the clamping block 405 is smaller than the width between the two stop blocks 107, and the stop blocks 107 form a limiting structure of the clamping block 405, so that the lifting frame 2 can be quickly locked through limiting clamping between the stop blocks 107 and the clamping block 405; referring to fig. 6, fig. 7 and fig. 8, the protection structure 4 further includes a force-bearing rod 406, the force-bearing rod 406 is welded on the force-bearing seat 403, and the force-bearing rod 406 is a cylindrical rod-shaped structure; stress rod 406 and wire rope 3 elastic contact, and be the joint state when stress rod 406 is located initial position between joint piece 405 and the dog 107 to stress rod 406 elasticity resets to initial position after wire rope 3 breaks, and then can realize the quick shutting of lifting frame 2 through the cooperation between joint piece 405 and the dog 107.
Referring to fig. 1, the frame body 1 comprises two seat plates 101 and a support seat 102, the two seat plates 101 are symmetrically welded on the frame body 1, and the two seat plates 101 are both rectangular plate-shaped structures; each seat plate 101 is symmetrically and threadedly connected with a support seat 102, and the support seats 102 form a horizontal support structure of the seat plate 101.
Referring to fig. 1, the frame body 1 further includes four through holes 103, and the four through holes 103 are respectively formed in the four support seats 102; the four through holes 103 are all circular hole-shaped structures, and the through holes 103 constitute a fixing structure of the support base 102.
Referring to fig. 6, the lifting frame 2 includes a rotating base 201, an adjusting rod 202 and a mounting base 203, the rotating base 201 is welded on the lifting frame 2, and the rotating base 201 is rotatably connected with the adjusting rod 202; the head end and the tail end of the adjusting rod 202 are respectively in threaded connection with a mounting seat 203, and the mounting seat 203 is in contact with the lifting frame 2; the thread directions of the head end and the tail end of the adjusting rod 202 are opposite, and the adjusting rod 202 forms a synchronous reverse adjusting structure of the two mounting seats 203, so that the adjusting efficiency of the mounting seats 203 can be improved.
Referring to fig. 1 and fig. 3, the frame body 1 further includes a plurality of slots 104, the slots 104 are formed in the frame body 1 in a rectangular array, and the slots 104 are in a rectangular groove-shaped structure; the lifting frame 2 further comprises two locking blocks 204, the two locking blocks 204 are arranged, and the two locking blocks 204 are respectively welded on the two mounting seats 203; the locking block 204 is matched with the card slot 104, and the locking block 204 and the card slot 104 together form a manual adjustment locking structure of the lifting frame 2.
Referring to fig. 1 and 2, the lifting frame 2 further includes a gear 205 and an adjusting lever 206, the gear 205 being mounted on the adjusting lever 202; the adjusting rod 206 is rotationally connected to the lifting frame 2, and the adjusting rod 206 is provided with spiral teeth; the spiral teeth formed on the adjusting rod 206 are engaged with the gear 205, and the adjusting rod 206 and the gear 205 form a worm and gear structure, so that the automatic locking after the adjustment of the adjusting rod 202 can be realized.
Referring to fig. 1 and 6, the frame 1 further includes a roller 105, a seat 106 and a stopper 107, the roller 105 is welded on the frame 1, and the wire rope 3 passes through the roller 105; the number of the seat bodies 106 is two, and the two seat bodies 106 are symmetrically welded on the frame body 1; the two seat bodies 106 are welded with the stop blocks 107 in a rectangular array shape, the stop blocks 107 are in rectangular block structures, and the seat bodies 106 are in L-shaped plate structures.
Referring to fig. 5, the protection structure 4 includes a sliding block 401, a sliding rod 402, a force-bearing seat 403 and an elastic member 404, the sliding block 401 is welded on the lifting frame 2, the sliding block 401 is connected with the sliding rod 402 in a sliding manner, and the force-bearing seat 403 is welded at the tail end of the sliding rod 402; the elastic member 404 is sleeved on the sliding rod 402, and the elastic member 404 constitutes the force-receiving seat 403 and the elastic restoring structure of the sliding rod 402.
The specific use mode and function of the embodiment are as follows:
when the lifting frame 2 needs to be locked manually, firstly, the head end and the tail end of the adjusting rod 202 are respectively in threaded connection with an installation seat 203, and the installation seat 203 is in contact with the lifting frame 2; the thread directions of the head end and the tail end of the adjusting rod 202 are opposite, and the adjusting rod 202 forms a synchronous reverse adjusting structure of the two mounting seats 203, so that the adjusting efficiency of the mounting seats 203 can be improved; secondly, two locking blocks 204 are arranged, and the two locking blocks 204 are respectively welded on the two mounting seats 203; the locking block 204 is matched with the card slot 104, and the locking block 204 and the card slot 104 jointly form a manual adjustment locking structure of the lifting frame 2; third, since the gear 205 is mounted on the adjustment lever 202; the adjusting rod 206 is rotationally connected to the lifting frame 2, and the adjusting rod 206 is provided with spiral teeth; the spiral teeth arranged on the adjusting rod 206 are meshed with the gear 205, and the adjusting rod 206 and the gear 205 jointly form a worm and gear structure, so that automatic locking after adjustment of the adjusting rod 202 can be realized;
after the steel wire rope 3 is broken, firstly, the sliding block 401 is welded on the lifting frame 2, the sliding block 401 is connected with the sliding rod 402 in a sliding manner, and the tail end of the sliding rod 402 is welded with the stress seat 403; the elastic piece 404 is sleeved on the sliding rod 402, and the elastic piece 404 forms a stress seat 403 and an elastic reset structure of the sliding rod 402; secondly, the clamping block 405 is welded on the sliding rod 402, and the clamping block 405 is aligned with the stop block 107; the width of the clamping block 405 is smaller than the width between the two stop blocks 107, and the stop blocks 107 form a limiting structure of the clamping block 405, so that the lifting frame 2 can be quickly locked through limiting clamping between the stop blocks 107 and the clamping block 405; thirdly, because of stress bar 406 and 3 elastic contact of wire rope, and be the joint state when stress bar 406 is located initial position between joint piece 405 and the dog 107 to stress bar 406 elasticity resets to initial position after wire rope 3 breaks, and then can realize the quick shutting of lifting frame 2 through the cooperation between joint piece 405 and the dog 107.
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 those of ordinary skill in the 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.
Claims (8)
1. The utility model provides an energy-conserving building construction lift anti-falling device which characterized in that: comprises a frame body (1); the lifting frame (2) is connected in the frame body (1) in a sliding mode, a steel wire rope (3) is connected to the lifting frame (2), and a protection structure (4) is installed on the lifting frame (2); the protection structure (4) comprises a clamping block (405), the clamping block (405) is welded on the sliding rod (402), and the clamping block (405) is aligned with the stop block (107); the width of the clamping block (405) is smaller than the width between the two stop blocks (107), and the stop blocks (107) form a limiting structure of the clamping block (405); the protection structure (4) further comprises a stress rod (406), the stress rod (406) is welded on the stress base (403), and the stress rod (406) is of a cylindrical rod-shaped structure; stress rod (406) and wire rope (3) elastic contact, and be the joint state when stress rod (406) is located initial position between joint piece (405) and dog (107).
2. The energy-saving building construction lifting anti-falling device is characterized in that: the frame body (1) comprises seat plates (101) and a supporting seat (102), the number of the seat plates (101) is two, the two seat plates (101) are symmetrically welded on the frame body (1), and the two seat plates (101) are both rectangular plate-shaped structures; each seat plate (101) is symmetrically and spirally connected with a support seat (102), and the support seats (102) form a horizontal support structure of the seat plate (101).
3. The energy-saving building construction lifting anti-falling device is characterized in that: the frame body (1) further comprises four through holes (103), the number of the through holes (103) is four, and the four through holes (103) are respectively formed in the four supporting seats (102); the four through holes (103) are all in a circular hole-shaped structure, and the through holes (103) form a fixing structure of the supporting seat (102).
4. The energy-saving building construction lifting anti-falling device is characterized in that: the lifting frame (2) comprises a rotating seat (201), an adjusting rod (202) and a mounting seat (203), the rotating seat (201) is welded on the lifting frame (2), and the rotating seat (201) is rotatably connected with the adjusting rod (202); the head end and the tail end of the adjusting rod (202) are respectively in threaded connection with an installation seat (203), and the installation seat (203) is in contact with the lifting frame (2); the thread directions of the head end and the tail end of the adjusting rod (202) are opposite, and the adjusting rod (202) forms a synchronous reverse adjusting structure of the two mounting seats (203).
5. The energy-saving building construction lifting anti-falling device is characterized in that: the rack body (1) further comprises clamping grooves (104), the clamping grooves (104) are formed in the rack body (1) in a rectangular array shape, and the clamping grooves (104) are of a rectangular groove-shaped structure; the lifting frame (2) further comprises two locking blocks (204), the two locking blocks (204) are arranged, and the two locking blocks (204) are respectively welded on the two mounting seats (203); the locking block (204) is matched with the clamping groove (104), and the locking block (204) and the clamping groove (104) jointly form a manual adjustment locking structure of the lifting frame (2).
6. The energy-saving building construction lifting anti-falling device is characterized in that: the lifting frame (2) further comprises a gear (205) and an adjusting rod (206), and the gear (205) is installed on the adjusting rod (202); the adjusting rod (206) is rotatably connected to the lifting frame (2), and the adjusting rod (206) is provided with spiral teeth; the spiral teeth arranged on the adjusting rod (206) are meshed with the gear (205), and the adjusting rod (206) and the gear (205) jointly form a worm and gear structure.
7. The energy-saving building construction lifting anti-falling device is characterized in that: the frame body (1) further comprises a roller (105), a base body (106) and a stop block (107), the roller (105) is welded on the frame body (1), and the steel wire rope (3) passes through the roller (105); the two seat bodies (106) are arranged, and the two seat bodies (106) are symmetrically welded on the frame body (1); the two seat bodies (106) are welded with the stop blocks (107) in a rectangular array shape, the stop blocks (107) are in rectangular block structures, and the seat bodies (106) are in L-shaped plate structures.
8. The energy-saving building construction lifting anti-falling device is characterized in that: the protection structure (4) comprises a sliding block (401), a sliding rod (402), a stress seat (403) and an elastic piece (404), the sliding block (401) is welded on the lifting frame (2), the sliding block (401) is connected with the sliding rod (402) in a sliding mode, and the stress seat (403) is welded at the tail end of the sliding rod (402); the elastic piece (404) is sleeved on the sliding rod (402), and the elastic piece (404) forms an elastic reset structure of the stress seat (403) and the sliding rod (402).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011633492.XA CN112832500A (en) | 2020-12-31 | 2020-12-31 | Energy-conserving construction lift anti-falling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011633492.XA CN112832500A (en) | 2020-12-31 | 2020-12-31 | Energy-conserving construction lift anti-falling device |
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| Publication Number | Publication Date |
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| CN112832500A true CN112832500A (en) | 2021-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011633492.XA Pending CN112832500A (en) | 2020-12-31 | 2020-12-31 | Energy-conserving construction lift anti-falling device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114427296A (en) * | 2022-02-11 | 2022-05-03 | 唐文一 | Vault supporting device and method for green building construction |
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| CN114427296A (en) * | 2022-02-11 | 2022-05-03 | 唐文一 | Vault supporting device and method for green building construction |
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Application publication date: 20210525 |
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| RJ01 | Rejection of invention patent application after publication |