CN103244529A - Expansion anchor bolt - Google Patents
Expansion anchor bolt Download PDFInfo
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- CN103244529A CN103244529A CN2013101611313A CN201310161131A CN103244529A CN 103244529 A CN103244529 A CN 103244529A CN 2013101611313 A CN2013101611313 A CN 2013101611313A CN 201310161131 A CN201310161131 A CN 201310161131A CN 103244529 A CN103244529 A CN 103244529A
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- screw mandrel
- expansion tube
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- expanding piece
- external diameter
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Abstract
The invention relates to the field of building materials, in particular to an expansion anchor bolt which comprises a tubular expansion part and an expansion tube. An inner thread is arranged on the inner wall of the expansion part, the outer diameter of the tubular expansion part is decreased progressively unilaterally along the axial direction thereof, and the outer diameter of one end of the tubular expansion part is larger than that of the other end. The end larger in outer diameter is a large end, a tube orifice is closed to form an end face of the expansion part, and the end smaller in outer diameter is a small end. The expansion tube is tubular and sleeved outside the expansion part. The inner diameter of the expansion tube is larger than the outer diameter of the small end of the expansion part and smaller than the outer diameter of the large end of the expansion part. Expansion gaps are reserved at one end, close to the large end of the expansion part, of the expansion tube. The expansion anchor bolt can be connected with a weight needing bearing or lifting, and can also be used for lifting weights without a socketed tube, thereby being timesaving, laborsaving and cost-saving; and hands are prevented from being hurt, and the expansion anchor bolt is less prone to shedding as enough force is applied to the expansion tube.
Description
Technical field
The present invention relates to building materials field, draw quick-fried in particular to a kind of screw mandrel.
Background technique
Modal fixedly weight has a pull explosive screw in the correlation technique, and that hangs fixing weight has a quick-fried screw in top.
Pull explosive screw is made up of the screw mandrel 1 that has conical head and expansion tube 2, nut 3 as shown in Figure 1, and an end of expansion tube 2 has dilatation joint; The screw mandrel 1 that will have conical head inserts from the end that expansion tube 2 has dilatation joint, and an end that makes its conical head and expansion tube 2 have dilatation joint offsets; In body of wall that needs use or structural material, punch earlier in use, and the pull explosive screw after will making up has an end of conical head to put into the hole inwardly, use nut 3 to be enclosed within on the screw mandrel 1 that has conical head and rotating nut 3, the screw mandrel 1 that will have conical head along with advancing of nut 3 pulls outward, nut 3 offsets with expansion tube 2, conical head progresses into the end that expansion tube has dilatation joint, the part that expansion tube 2 has a dilatation joint is squeezed and opens and produce strong frictional force with the outer hole inwall of expansion tube wall, have the end that conical head is arranged of conical head screw mandrel 1 this moment in the expansion tube wall, the screw mandrel portion of the other end exposes outside the hole, fixedly weight.
Pushing up quick-fried screw as shown in Figure 2, is expansion tube 5 and implosion 6 compositions that an end has dilatation joint, and the inside that an end of expansion tube 5 has dilatation joint and expansion tube 5 is provided with internal thread 4.In the ceiling board structural material that needs use, punch earlier during use, an end that expansion tube 5 is had dilatation joint is placed inwardly, and use round steel and sledgehammer that the part that expansion tube 5 has dilatation joint is squeezed in implosion 6, expansion tube 5 is squeezed open and produces strong frictional force with outer body of wall or the structural material of expansion tube wall, during lifting will with screw mandrel be screwed in the internal thread of expansion tube 5 inside and get final product.
But pull explosive screw can leave the screw mandrel of projection after use, as in time cutting off, on the ground or the screw mandrel on the brick wall, might trip and scratch the pedestrian; If pull explosive screw is used for other screw mandrel of lifting, need increase the inner adapter sleeve that be provided with internal thread at screw mandrel, the internal thread with other screw mandrel and adapter sleeve is spirally connected again, wastes time and energy and increases cost; Push up quick-fried screw and must back down the expansion pipe seam in use, this operation need be used sledgehammer and the round steel that matches with the quick-fried implosion 6 in top is finished, take time and effort in the work progress and hinder hand easily and cause industrial injury, also easily because back down the expansion pipe seam dynamics not enough and come off.
Summary of the invention
It is quick-fried to the object of the present invention is to provide a kind of screw mandrel to draw, to solve the above problems.
It is quick-fried to provide a kind of screw mandrel to draw in an embodiment of the present invention, as shown in Figure 3, comprising: expanding piece 8, expansion tube 11; Described expanding piece 8 is tubulose, and its inwall is provided with internal thread, and the external diameter of the described expanding piece 8 of tubulose successively decreases along its axial direction is monolateral, and the external diameter of one end is greater than the other end; Wherein, the end that external diameter is bigger is the end face 7 that bigger end and mouth of pipe sealing form expanding piece, and the less end of external diameter is than small end; Described expansion tube 11 is tubulose, is sheathed on outside the described expanding piece 8, and its internal diameter is greater than the external diameter than small end of described expanding piece 8, less than the external diameter of the bigger end of described expanding piece 8; Described expansion tube 11 is provided with dilatation joint 9 near an end of the bigger end of described expanding piece 8.
The screw mandrel of the above embodiment of the present invention draws quick-fried, by in body of wall or other structural material, punching earlier in use, expansion tube 11 is placed in outside the external diameter than small end of expanding piece 8, expansion tube 11 is provided with an end of dilatation joint 9 near the bigger end of described expanding piece 8, the internal thread that the screw mandrel end of one end of screw mandrel or other device that need lift is passed expansion tube 11 and expanding piece 8 is spirally connected, make to be enclosed within and be used for locking the nut 15 of screw mandrel or the other end that locking element is stayed the screw mandrel outside the expansion tube 11 on the screw mandrel, draw the bigger end of quick-fried expanding piece 8 to put into the hole inwardly the screw mandrel after combining, utilizing nut 15 on the screw mandrel to screw pulls out screw mandrel, expanding piece 8 is drawn into the expansion tube 11 that has dilatation joint 9 gradually, the expansion tube wall is squeezed and opens gradually and produce strong frictional force with body of wall or other structural material, can will need the weight of load-bearing or lifting to be attached thereto.Screw mandrel draws quick-fried both can being used on the straight wall, after the use screw mandrel is drawn off and can avoid scratching the pedestrian; Also can be used for the lifting weight, directly just can lift other screw mandrel by internal thread, need not to use socketed pipe, time saving and energy saving cost-saving; More need not to use sledgehammer and round steel to match with implosion and open the expansion tube wall that has dilatation joint 9 one ends, time saving and energy saving and avoid hindering hand, and the dynamics of granting expansion tube 11 enough is not easy to come off.
Description of drawings
Fig. 1 shows the schematic representation of a kind of pull explosive screw in the correlation technique of the present invention;
Fig. 2 shows a kind of schematic representation that pushes up quick-fried screw in the correlation technique of the present invention;
Fig. 3 shows the schematic representation that screw mandrel of the present invention draws quick-fried a kind of embodiment;
Fig. 4 shows the schematic representation that screw mandrel of the present invention draws end face 7 shapes of quick-fried expanding piece.
Reference character: 1-has the screw mandrel of conical head; The 2-expansion tube; The 3-nut; The 4-internal thread; The 5-expansion tube; The 6-implosion; The end face of 7-expanding piece; The 8-expanding piece; The 9-dilatation joint; The 10-through hole; The 11-expansion tube; The 12-screw mandrel; The 13-plain washer; The 14-spring washer; The 15-nut.
Embodiment
Also by reference to the accompanying drawings the present invention is described in further detail below by specific embodiment.
It is quick-fried to use screw mandrel among the present invention to draw, and about the general dark 5mm of length of punching depth ratio expansion tube 11, the hardness of structural material is more high more good, and the force intensity that is subjected to that is installed in the concrete is in the brick body five times.
A kind of screw mandrel draws quick-fried, as shown in Figure 3, comprising: expanding piece, expansion tube 11; Expanding piece is tubulose, and its inwall is provided with internal thread, and the external diameter of the expanding piece of tubulose successively decreases along its axial direction is monolateral, and the external diameter of one end is greater than the other end; Wherein, the end that external diameter is bigger is the end face 7 that bigger end and mouth of pipe sealing form expanding piece, and the less end of external diameter is than small end; Expansion tube 11 is tubulose, be sheathed on outside the expanding piece, its internal diameter greater than expanding piece than the small end external diameter, less than the bigger end external diameter of expanding piece; Expansion tube 11 is provided with dilatation joint 9 near an end of the bigger end of expanding piece.
The screw mandrel of the above embodiment of the present invention draws quick-fried, by in body of wall or other structural material, punching earlier in use, expansion tube 11 is placed in outside the external diameter than small end of expanding piece 8, expansion tube 11 is provided with an end of dilatation joint 9 near the bigger end of described expanding piece 8, the internal thread that the screw mandrel end of screw mandrel 12 1 ends or other device that need lift is passed expansion tube 11 and expanding piece 8 is spirally connected, make to be enclosed within and be used for locking the nut 15 of screw mandrel 12 or the other end that locking element is stayed the screw mandrel 12 outside the expansion tube 11 on the screw mandrel 12, draw the bigger end of quick-fried expanding piece 8 to put into the hole inwardly the screw mandrel after combining, utilizing nut 15 on the screw mandrel 12 to screw pulls out screw mandrel 12, expanding piece 8 is drawn into the expansion tube 11 that has dilatation joint 9 gradually, the expansion tube wall is squeezed and opens gradually and produce strong frictional force with body of wall or other structural material, can will need the weight of load-bearing or lifting to be attached thereto.Screw mandrel draws quick-fried both can being used on the straight wall, after the use screw mandrel 12 is drawn off and can avoid scratching the pedestrian; Also can be used for the lifting weight, directly just can lift other screw mandrel by internal thread, need not to use socketed pipe, time saving and energy saving cost-saving; More need not to use sledgehammer and round steel to match with implosion and open the expansion tube wall that has dilatation joint 9 one ends, time saving and energy saving and avoid hindering hand, and the dynamics of granting expansion tube 11 enough is not easy to come off.
Preferably, above-mentioned screw mandrel draw quick-fried in, the thickness of the end face 7 of expanding piece is greater than 3mm.
By the end surface thickness of expanding piece 8 is set, make the intensity of expanding piece 8 increase, be conducive to expand and open the expansion tube wall, increase load-bearing and lift heavy weight.
Preferably, above-mentioned screw mandrel draw quick-fried in, also comprise: screw mandrel 12; The outer wall of screw mandrel 12 is provided with the outside thread that matches with internal thread; Described screw mandrel 12 is bolted in the expanding piece 8, and its length is greater than the length of expansion tube 11; And/or; Nut 15; The corresponding internal thread that arranges of outside thread of nut 15 and screw mandrel 12.
Screw mandrel wherein draws and quick-friedly can also comprise screw mandrel and nut simultaneously, also can include only wherein the same.
By increasing screw mandrel, can be used directly on the straight wall fixedly weight; By using 15 pairs of screw mandrels of nut to lock, can carry out fasteningly to the position of screw mandrel 12, and can increase work efficiency.
Preferably, above-mentioned screw mandrel draw quick-fried in, being shaped as of the end face 7 of expanding piece: a circle is cut the shape that forms by two parallel lines, and two described parallel lines are with respect to the center of circle symmetry of described circle.
The shape of the end face 7 by setting expanding piece, when expanding piece enters in the tube wall fully, make the tube wall place at end face 7 places of expanding piece produce deformation, convenient when drawing off screw mandrel fixedly expanding piece in the position at tube wall place, the hole wall at back and its place has powerful frictional force because the expansion tube wall is opened again, and so the fixed-site of the tube wall that therefore expands is the fixed-site of expanding piece, expanding piece can be moving in the transfer of expansion tube wall with the rotation of screw mandrel during screw mandrel in dismounting, easier screw mandrel drawn off.
Preferably, above-mentioned screw mandrel draw quick-fried in, also comprise: plain washer 13 and/or spring washer 14; Plain washer 13 and/or spring washer 14 are sheathed on the screw mandrel, and between nut 15 and expansion tube 11.
Plain washer wherein and spring washer can use simultaneously, also can only use wherein.
By using plain washer 13, can increase friction area between nut 15 and the expansion tube 11 with increase frictional force, make that the locking effect of nut 15 is more firm; By using spring washer 14, after tightening, nut 15 offers elastic force of nut, increase the frictional force between nut 15 and the screw mandrel 12, make screw mandrel to use and also be difficult for getting loose automatically for many years dropping.
Preferably, above-mentioned screw mandrel draw quick-fried in, the bottom of the dilatation joint 9 on the expansion tube 11 is provided with through hole 10; And/or; The outer surface that expansion tube 11 is provided with an end of dilatation joint 9 also is provided with for the structure that increases frictional force.
Can be provided with the structure of through hole 10 and increase frictional force on the expansion tube wall wherein simultaneously, also can only be provided with wherein a kind of.
By through hole 10 is set, easier the opening of part that makes described expansion tube wall be provided with dilatation joint 9.By the structure that increases frictional force is set, an end tube wall that makes expansion tube 11 be provided with dilatation joint 9 frictional force of opening between back and body of wall or other structural material that is squeezed is bigger, and screw mandrel draws quick-fried installation more firm.
Preferably, above-mentioned screw mandrel draw quick-fried in, dilatation joint 9 is three, corresponding through hole 10 is three.
By three dilatation joints 9 and three through holes 10 being set, feasible expansion tube wall easier the opening in proof strength that is provided with dilatation joint 9 and through hole 10.
Alternatively, above-mentioned screw mandrel draw quick-fried in, the external diameter than small end of expanding piece 8 is 10mm, the external diameter of bigger end is 12mm, the nominal diameter of screw mandrel is M8, and the thickness of the tube wall of expansion tube 11 is 1mm, and the distance between the arc top of the circular arc of parallel lines and its intercepting is 1mm;
The length of expansion tube 11 is 25mm, and the length of screw mandrel is more than or equal to 180mm; Or the length of expansion tube 11 is 50mm, and the length of screw mandrel is more than or equal to 70mm; Or the length of expansion tube 11 is 70mm, and the length of screw mandrel is more than or equal to 100mm.
Be 10mm by the external diameter than small end that uses this expanding piece 8, the external diameter of bigger end is 12mm, the nominal diameter of screw mandrel 12 is M8, the thickness of the tube wall of expansion tube 11 is 1mm, distance between the arc top of the circular arc of parallel lines and its intercepting is that the screw mandrel of 1mm draws quick-fried, when the length of expansion tube 11 was 25mm, the length of the screw mandrel that is mated was generally more than or equal to 180mm; When the length of expansion tube 11 was 50mm, the length of the screw mandrel that is mated was generally more than or equal to 70mm; When the length of expansion tube 11 was 70mm, the length of the screw mandrel that is mated was generally more than or equal to 100mm.Install and be used under the situation of fixing non-vibration spare correct, a M8 screw mandrel in the concrete draws stressed 170 kilograms of quick-fried least desirable largest static.
Alternatively, above-mentioned screw mandrel draw quick-fried in, the external diameter than small end of expanding piece 8 is 12mm, the external diameter of bigger end is 14mm, the nominal diameter of screw mandrel 12 is M10, and the thickness of the tube wall of expansion tube 11 is 1mm, and the distance between the arc top of the circular arc of parallel lines and its intercepting is 1mm;
The length of expansion tube 11 is 30mm, and the length of screw mandrel is more than or equal to 180mm; Or the length of expansion tube 11 is 50mm, and the length of screw mandrel is more than or equal to 70mm; Or the length of expansion tube 11 is 70mm, and the length of screw mandrel is more than or equal to 100mm.
Be 12mm by the external diameter than small end that uses this expanding piece 8, the external diameter of bigger end is 14mm, the nominal diameter of screw mandrel 12 is M10, the thickness of the tube wall of expansion tube 11 is 1mm, distance between the arc top of the circular arc of parallel lines and its intercepting is that the screw mandrel of 1mm draws quick-fried, when the length of expansion tube 11 was 30mm, the length of the screw mandrel that is mated was generally more than or equal to 180mm; When the length of expansion tube 11 was 50mm, the length of the screw mandrel that is mated was generally more than or equal to 70mm; When the length of expansion tube 11 was 70mm, the length of the screw mandrel that is mated was generally more than or equal to 100mm.Install and be used under the situation of fixing non-vibration spare correct, a M10 screw mandrel in the concrete draws stressed 320 kilograms of quick-fried least desirable largest static.
Alternatively, above-mentioned screw mandrel draw quick-fried in, the external diameter than small end of expanding piece 8 is 14mm, the external diameter of bigger end is 16mm, the nominal diameter of screw mandrel 12 is M12, and the thickness of the tube wall of expansion tube 11 is 1mm, and the distance between the arc top of the circular arc of parallel lines and its intercepting is 1mm;
The length of expansion tube 11 is 35mm, and the length of screw mandrel is more than or equal to 180mm; Or the length of expansion tube 11 is 50mm, and the length of screw mandrel is more than or equal to 70mm; Or the length of expansion tube 11 is 70mm, and the length of screw mandrel is more than or equal to 100mm.
Be 14mm by the external diameter than small end that uses this expanding piece 8, the external diameter of bigger end is 16mm, the nominal diameter of screw mandrel 12 is M12, and the thickness of the tube wall of expansion tube 11 is 1mm, and the distance between the arc top of the circular arc of parallel lines and its intercepting is that the screw mandrel of 1mm draws quick-fried; When the length of expansion tube 11 was 35mm, the length of the screw mandrel that is mated was generally more than or equal to 180mm; When the length of expansion tube 11 was 50mm, the length of the screw mandrel that is mated was generally more than or equal to 70mm; When the length of expansion tube 11 was 70mm, the length of the screw mandrel that is mated was generally more than or equal to 100mm.Install and be used under the situation of fixing non-vibration spare correct, a M12 screw mandrel in the concrete draws stressed 510 kilograms of quick-fried least desirable largest static.
Above-mentioned combination in any preferred and optional mode of execution is embodiments of the invention.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a screw mandrel draws quick-friedly, it is characterized in that, comprising: expanding piece, expansion tube;
Described expanding piece is tubulose, and its inwall is provided with internal thread, and the external diameter of the described expanding piece of tubulose successively decreases along its axial direction is monolateral, and the external diameter of one end is greater than the other end; Wherein, the end that external diameter is bigger is the end face that bigger end and mouth of pipe sealing form expanding piece, and the less end of external diameter is than small end;
Described expansion tube is tubulose, is sheathed on outside the described expanding piece, and its internal diameter is greater than the external diameter than small end of described expanding piece, less than the external diameter of the bigger end of described expanding piece;
Described expansion tube is provided with dilatation joint near an end of the bigger end of described expanding piece.
2. screw mandrel according to claim 1 draws quick-friedly, it is characterized in that the thickness of the end face of described expanding piece is greater than 3mm.
3. screw mandrel according to claim 2 draws quick-friedly, it is characterized in that, also comprises: screw mandrel;
The outer wall of described screw mandrel is provided with the outside thread that matches with described internal thread; Described screw mandrel is bolted in the described expanding piece, and its length is greater than the length of described expansion tube;
And/or;
Nut;
The corresponding internal thread that arranges of outside thread of described nut and described screw mandrel.
4. screw mandrel according to claim 3 draws quick-friedly, and it is characterized in that being shaped as of the end face of described expanding piece: a circle is cut the shape that forms by two parallel lines, and two described parallel lines are with respect to the center of circle symmetry of described circle.
5. screw mandrel according to claim 3 draws quick-friedly, it is characterized in that, also comprises: plain washer and/or spring washer;
Described plain washer and/or described spring washer are sheathed on the described screw mandrel, and between described nut and described expansion tube.
6. screw mandrel according to claim 1 draws quick-friedly, it is characterized in that the bottom of the described dilatation joint on the described expansion tube is provided with through hole;
And/or;
The outer surface that described expansion tube is provided with an end of dilatation joint also is provided with for the structure that increases frictional force.
7. screw mandrel according to claim 6 draws quick-friedly, it is characterized in that described dilatation joint is three, and corresponding described through hole is three.
8. screw mandrel according to claim 4 draws quick-fried, it is characterized in that, the external diameter than small end of described expanding piece is 10mm, the external diameter of described bigger end is 12mm, the nominal diameter of described screw mandrel is M8, the thickness of the tube wall of described expansion tube is 1mm, and the distance between the arc top of the circular arc of described parallel lines and its intercepting is 1mm;
The length of described expansion tube is 25mm, and the length of described screw mandrel is more than or equal to 180mm; Or the length of described expansion tube is 50mm, and the length of described screw mandrel is more than or equal to 70mm; Or the length of described expansion tube is 70mm, and the length of described screw mandrel is more than or equal to 100mm.
9. screw mandrel according to claim 4 draws quick-fried, it is characterized in that, the external diameter than small end of described expanding piece is 12mm, the external diameter of described bigger end is 14mm, the nominal diameter of described screw mandrel is M10, the thickness of the tube wall of described expansion tube is 1mm, and the distance between the arc top of the circular arc of described parallel lines and its intercepting is 1mm;
The length of described expansion tube is 30mm, and the length of described screw mandrel is more than or equal to 180mm; Or the length of described expansion tube is 50mm, and the length of described screw mandrel is more than or equal to 70mm; Or the length of described expansion tube is 70mm, and the length of described screw mandrel is more than or equal to 100mm.
10. screw mandrel according to claim 4 draws quick-fried, it is characterized in that, the external diameter than small end of described expanding piece is 14mm, the external diameter of described bigger end is 16mm, the nominal diameter of described screw mandrel is M12, the thickness of the tube wall of described expansion tube is 1mm, and the distance between the arc top of the circular arc of described parallel lines and its intercepting is 1mm;
The length of described expansion tube is 35mm, and the length of described screw mandrel is more than or equal to 180mm; Or the length of described expansion tube is 50mm, and the length of described screw mandrel is more than or equal to 70mm; Or the length of described expansion tube is 70mm, and the length of described screw mandrel is more than or equal to 100mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101611313A CN103244529A (en) | 2013-05-03 | 2013-05-03 | Expansion anchor bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101611313A CN103244529A (en) | 2013-05-03 | 2013-05-03 | Expansion anchor bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103244529A true CN103244529A (en) | 2013-08-14 |
Family
ID=48924289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101611313A Pending CN103244529A (en) | 2013-05-03 | 2013-05-03 | Expansion anchor bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103244529A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2302363Y (en) * | 1997-02-06 | 1998-12-30 | 戴宏乔 | Combined full-expanding fixing constructional element |
| CN2403938Y (en) * | 1999-08-07 | 2000-11-01 | 曹现强 | Expansion bolt |
| CN2937600Y (en) * | 2006-06-22 | 2007-08-22 | 张艳 | Expansion pipe |
| CN101793279A (en) * | 2009-12-24 | 2010-08-04 | 赵延斌 | Reusable metal expansion pipe |
| CN202673929U (en) * | 2012-07-05 | 2013-01-16 | 巫英龙 | Explosive screw |
| CN203285806U (en) * | 2013-05-03 | 2013-11-13 | 张进荣 | Pull expansion device for lead screw |
-
2013
- 2013-05-03 CN CN2013101611313A patent/CN103244529A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2302363Y (en) * | 1997-02-06 | 1998-12-30 | 戴宏乔 | Combined full-expanding fixing constructional element |
| CN2403938Y (en) * | 1999-08-07 | 2000-11-01 | 曹现强 | Expansion bolt |
| CN2937600Y (en) * | 2006-06-22 | 2007-08-22 | 张艳 | Expansion pipe |
| CN101793279A (en) * | 2009-12-24 | 2010-08-04 | 赵延斌 | Reusable metal expansion pipe |
| CN202673929U (en) * | 2012-07-05 | 2013-01-16 | 巫英龙 | Explosive screw |
| CN203285806U (en) * | 2013-05-03 | 2013-11-13 | 张进荣 | Pull expansion device for lead screw |
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Application publication date: 20130814 |