CN1046482C - Vaccum-suction attachement pad - Google Patents
Vaccum-suction attachement pad Download PDFInfo
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- CN1046482C CN1046482C CN95109135A CN95109135A CN1046482C CN 1046482 C CN1046482 C CN 1046482C CN 95109135 A CN95109135 A CN 95109135A CN 95109135 A CN95109135 A CN 95109135A CN 1046482 C CN1046482 C CN 1046482C
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Abstract
The rear part of an absorption disk body, which is away from the supporting surface of an external absorption disk, is provided with a suction cavity. The front end part of the absorption disk body, which faces to the supporting surface of the absorption disk, is divided into a plurality of aspiration chambers communicated with the suction cavity. The present invention is provided with an air circulation channel so as to communicate with the suction cavity. The air circulation channel between each aspiration chamber and the suction cavity is provided with a valve mechanism. The valve mechanisms can be shut down by sucked airflow which appears in the period of vacuum suction. In addition, a part of air circulation channels are provided with an automatic switching valve in such a mode, namely that the switching valve is provided with the supporting surface which is tightly attached on the absorption disk. The air circulation channels are formed in such a mode, namely that the direction of the opening action force of the automatic switching valve is different from that of the reverse action force of a spring member which always actuates the switching valve to close.
Description
In short, the present invention relates to vaccum-suction attachement pad.More particularly, the present invention relates to a kind of like this vaccum-suction attachement pad one promptly: it can utilize pull of vacuum to be adsorbed onto fully on the desirable outer surface, any inadequate or unsuccessful absorption can not appear, promptly box lunch is applied to a uneven surface to it, such as, between ceramic tile, have the depression seam the metope that posts ceramic tile on the time also can be like this.
The invention still further relates to a kind of like this vaccum-suction attachement pad-promptly: during use, it only is connected on the vacuum draw equipment with one or more other such suction trays, so that finish reliable absorption jointly to desirable outer surface, and, realize the characterization of adsorption that highly improves.The invention further relates to a kind of vaccum-suction attachement pad that can help effectively to reduce as the size of the vacuum pump of vacuum draw equipment.
Be suitable for especially as easy anti-sway device according to vaccum-suction attachement pad of the present invention, in order to prevent carrying out the used power operated scaffold cradle of aloft work or the undesirable of lifting railway carriage or compartment waves along an outside face of handling.
At present, carrying implement uses widely such as the Work machine in the scaffold of the manned or unmanned power operated suspension of manipulator etc. or lifting railway carriage or compartment and so on, purpose is to carry out aloft work safely and effectively, such as, high-rise-or cleaning, maintenance or the inspection of a large amount of wall surface of middle-high building thing, big container, boats and ships, power station or other facility, and carry out work that load is risen to the high-altitude and falls load from the high-altitude.For example, under the situation of being constructed in the wall surface of building with a kind of like this machine, be set at scaffold or the lifting railway carriage or compartment that the self-contained winch of winch or lifting railway carriage or compartment on the roof crane on the roof floor slab hangs by means of steel rope and vertically move, so that the surface location that is positioned to be scheduled to along said wall surface.But, carry out in the mechanical work in this manned or unmanned lifting of use railway carriage or compartment, no matter winch is carried within the lifting railway carriage or compartment or separately is set in place on the roof crane on the roof floor slab, along with the distinctive mobile of machine or owing to powerful blast or similar reason, there is level to wave to reach the tendency of a degree that can not be ignored in the lifting railway carriage or compartment of suspending in midair, and its reason just is that it is in a kind of unsure state.
In order to address this is that, proposed the various devices that wave in order to the lifting railway carriage or compartment that prevents from suspending in midair already, they all use the vaccum-suction attachement pad of the not end (that is: in the face of that end of the wall surface) of two arms that are fixedly mounted on the relative both sides that are arranged on the lifting railway carriage or compartment.These vaccum-suction attachement pads are communicated with vacuum pump fluid on being carried at the lifting railway carriage or compartment by pipe, operation along workpiece is just to carry out after being fixed in lifting railway carriage or compartment opsition dependent on the wall surface, the location in lifting railway carriage or compartment is by handling vacuum pump, the inside of vaccum-suction attachement pad is placed the state of being convenient to implement vacuum draw, sucker is overlayed at the metope of wanting to construct promptly: the sucker areal of support-on, then, sucker in-to-in air extraction.
Used in the anti-sway device of vaccum-suction attachement pad in this class, prevent that the lifting railway carriage or compartment of suspending in midair from waving necessary adsorption affinity is to be decided by the extraction of air on the degree of vacuum that can be reached by used vacuum pump and each adsorption plane (or claiming discharging) amount etc., and, suction tray will be designed to be adsorbed in any smooth surface, and irrelevant with this surperficial material of formation.In fact, vaccum-suction attachement pad can be adsorbed onto on the smooth surface of glass, precast concrete (PC) plate, normal concrete and ceramic tile etc., even can be adsorbed onto being coated with on the patterned surface of these materials, as long as these surfaces are enough smooth.
But, under the uneven situation of that areal of support that vaccum-suction attachement pad will be used, for example, have at the suction tray areal of support under the situation of the seam that connects ceramic tile or PC plate, can between uneven suction tray areal of support and suction tray, form the gap, therefore, during with the vacuum pump suction air, by these gaps, significant escape of air will appear, so, cause inadequate or unsuccessful absorption to the sucker areal of support.Therefore, traditional vaccum-suction attachement pad can not obtain effectively to prevent that the lifting railway carriage or compartment of suspending in midair from waving necessary adsorption affinity.
The adverse effect that causes for the unevenness with areal of support reduces to minimum, must guarantee enough air exhaustion amounts and the cross-sectional area that strengthens each pipe that connects vaccum-suction attachement pad and vacuum pump.
Yet, be connected under the situation of same vacuum pump by the pipe that has strengthened diameter at two vaccum-suction attachement pads, if have only one fully closely to contact in the middle of these two suction trays with that areal of support that aspiration vacuum will be adsorbed, and another suction tray is not like this, so, because this suction tray causes it only to have smaller draw resistance with the incomplete contact of areal of support, therefore, in this another suction tray, can only tentatively realize vacuum draw.As a result, the pull of vacuum of that suction tray of closed contact areal of support often is not enough to thoroughly to prevent waving of the lifting railway carriage or compartment of suspending in midair.
Problem hereto, a kind of solution of proposal is in the pipe between vacuum pump and each vaccum-suction attachement pad a valve to be set, like this, when implementing vacuum draw, just can manually close with the corresponding valve of that suction tray that can not contact fully with the suction tray areal of support.But the solution of this proposal makes significantly and prevents that the lifting railway carriage or compartment of suspending in midair from waving required complicated operationization.
In addition, in order to reduce escape of air, usually, utilize lining cement that one elastic sealing element is promptly bonded on each suction tray towards the periphery of that end of areal of support along the front end one of suction tray from vaccum-suction attachement pad.But, because the lifting railway carriage or compartment whenever moves to another position once from a position along areal of support, elastic sealing element will attach to the suction tray areal of support and/or break away from once from the suction tray areal of support, therefore, this elastic sealing element is easy to wearing and tearing or damages, thereby the sealing part has to regularly replace more or less.When changing sealing member, must remove sealing member and be remained in lining cement on the suction tray after being peeled off, this just makes and more changes jobs very loaded down with trivial details and waste man-hour.
In view of above-mentioned defective, the inventor once proposed a kind of improved vaccum-suction attachement pad in the flat 3-86275 of Japanese Utility Model patent application, this suction tray can be adsorbed onto on the dish areal of support easily, and without any need for special operation, and, also simplified the replacing of elastic sealing element.For this reason, be provided with an automatic switch valve on vaccum-suction attachement pad, when the absorption disk body overlayed on the suction tray areal of support, this switch valve action made the inner chamber of suction tray be communicated with vacuum draw equipment, takes out suction so that carry out vacuum within it.In addition, this absorption disk body has a peripheral groove, peripheral groove is formed at that end towards the suction tray areal of support of suction tray, and this groove has a kind of like this trapezoidal cross sectional shape-promptly: its opening towards areal of support and its trapezoidal bottom aspect the width greater than open end.By means of the elasticity of elastic sealing element self it tightly is fixed within the groove crowdedly.
Suction tray according to this proposal, because this setting of automatic switch (opening/closing) valve of work automatically along with the areal of support of the absorption disk body that tightly reclines, no longer need to realize vacuum draw with complicated operations, and, because elastic sealing element only flexibly is embedded in rather than is bonded at lining cement in the fixed groove of above-mentioned trapezoidal cross-section shape, therefore, the replacing of sealing member can be carried out easily.
The proposed vaccum-suction attachement pad of above-mentioned Japanese Utility Model patent application can be apace and fully is adsorbed onto on the dish areal of support, and it can also simplify the required operation of replacing elastic sealing element.
Yet, the inventor further studies show that, though the vaccum-suction attachement pad of device above-mentioned proposal, that wave as the lifting railway carriage or compartment that prevents to suspend in midair is smaller at the hoisting depth when the lifting railway carriage or compartment, such as, during about 30m, there is not tangible problem, but, when the hoisting depth in lifting railway carriage or compartment is bigger, such as about more than 50 meters the time, then suction tray tends to insufficient to the absorption of dish areal of support.This be because, under so big hoisting depth, open the necessary given power of suction tray and work, make to be difficult to suction tray is adsorbed onto on the areal of support.At present, problem needs appropriate solution in a hurry hereto, and this is because current building has more and more higher trend, so the hoisting depth in lifting railway carriage or compartment is often above 100 meters.
More particularly, under a kind of like this condition, promptly before vaccum-suction attachement pad will be adsorbed onto on the suction tray areal of support, automatic switch valve was closed at once, and, utilize the inner chamber of the suction tray that the vacuum pump handle is connected with vacuum pump to place vacuum state, given tensile force F who depends on the cross-sectional area of automatic switch valve (F=PA, in the formula, the P representative is when the pressure of supposition bar pressure when being zero, A is the cross-sectional area of valve) work, so that open valve.This tensile force F is constant, and is irrelevant with the hoisting depth in lifting railway carriage or compartment.Therefore, the thrust of compression spring must be slightly greater than above-mentioned tensile force F, so that before suction tray is tightly clinged on the suction tray areal of support, automatic switch valve is remained on closed condition.
Then, when attached disk body of suction and suction tray areal of support are contacted surely, automatic switch valve is opened by the synthetic antagonistic force from the suction tray areal of support, therefore, air within the vaccum-suction attachement pad is just aspirated out or pumps by vacuum pump, at this moment, the pressure reduction between automatic switch valve inside and outside will disappear.Therefore, compression spring, act on the suction tray as a kind of thrust or pressure of antagonistic force, the size of this antagonistic force is determined by compression spring.But when the lifting railway carriage or compartment that by wire rope suspensioning is in a big hoisting depth, the lifting railway carriage or compartment will be very easy to move, even a little angle of oscillation also will cause the lifting railway carriage or compartment to move a big distance.In other words,, apply a smaller antagonistic force, often will make the lifting railway carriage or compartment move and separate from areal of support along with the increase of hoisting depth.
Therefore, under the situation of the vaccum-suction attachement pad of proposing in the Japanese Utility Model patent application of mentioning in the above, compression spring power, promptly the antagonistic force of being given to suction tray by areal of support becomes big along with the increase of the hoisting depth in lifting railway carriage or compartment.Therefore, under a big hoisting depth, because the cause of the antagonistic force of suction tray areal of support, suction tray is in case contact with the suction tray areal of support, just split away off from the suction tray areal of support soon again, the result is to be adsorbed onto on the areal of support deficiently or unsuccessfully.
Except the problem that the above-mentioned antagonistic force by compression spring causes, also has a problem, that is exactly, open the required antagonistic force of automatic switch valve along with the areal of support of the suction tray that closely reclines and separate required power from areal of support greater than causing adsorbing disk body, owing to above-mentioned similar reason, really be close on the areal of support so that before opening automatic switch valve at suction tray, suction tray will separate from areal of support.
Therefore, an object of the present invention is to provide a kind of vaccum-suction attachement pad, it can utilize pull of vacuum to be adsorbed onto fully on the surface of an expectation, any inadequate or unsuccessful absorption can not appear, though when it is applied to a uneven surface ratio as the metope that posts ceramic tile that between ceramic tile, has the seam that caves on the time also be like this.
Another object of the present invention provides a kind of vaccum-suction attachement pad, and it is suitable for can not causing any problem above-mentioned as the device that prevents to wave in order in the lifting railway carriage or compartment of suspending in midair of aloft work.
To achieve these goals, vaccum-suction attachement pad according to a first aspect of the invention comprises: one is suitable for utilizing pull of vacuum and tightly clings to absorption disk body on the exterior suction tray areal of support that it wants to adsorb; Suction chamber that is arranged on this absorption disk body away from that rear end of above-mentioned areal of support; That fore-end this absorption disk body, that face the suction tray areal of support is separated into several aspirating chambers by a partition wall, and each aspirating chamber communicates with suction chamber; One for being communicated with the airflow path that suction chamber is provided with; And, being arranged on the valve system on the airiness branch road between each aspirating chamber and the suction chamber, these valve systems can be sucked the windstream of the suction that is occurred during the vacuum and close.
The basic feature of vaccum-suction attachement pad according to a first aspect of the invention is, be arranged on absorption disk body leading section (promptly, several aspirating chambers that end in the face of the suction tray areal of support), that be connected with suction chamber, and, be arranged on the airiness branch road between each aspirating chamber and the suction chamber, be designed to be able to be sucked the valve system that the stream that deflates that occurred during the vacuum is closed.When after the outside face that suction tray and is included uneven surface portion contacts and when carrying out vacuum draw, any one carries out appropriate vacuum draw with contacted that aspirating chamber of surface portion that does not have non-flatness in the middle of the aspirating chamber, because this aspirating chamber seals fully with extraneous the realization, therefore, this aspirating chamber can be adsorbed onto on the areal of support securely.On the other hand, under the situation of the aspirating chamber leaving gap between them that contacts with the surface portion with unevenness, being located at corresponding valve system between this aspirating chamber and the suction chamber (although with the insufficient sealing in the external world) can be closed from the windstream of external suction by above-mentioned gap.In case valve system is closed in the above described manner, so, in the implementation process of vacuum draw, this valve system is with regard to owing to existing difference of pressure to keep closed condition between aspirating chamber and the suction chamber, so just prevent undesirable reduction of the degree of vacuum that reached in the suction chamber effectively, and the degree of vacuum that has reached in the absorption disk body that prevents to communicate with suction chamber to the greatest extent reduces.
Therefore, this vaccum-suction attachement pad can utilize pull of vacuum to be adsorbed onto fully on the desirable outside face, inadequate or unsuccessful absorption can not occur, also can be like this when promptly this outside face of box lunch is uneven.
Vaccum-suction attachement pad according to a second aspect of the invention comprises: one is suitable for utilizing pull of vacuum and tightly clings to absorption disk body on that exterior suction tray areal of support that it wants to adsorb; One be arranged on this absorption disk body away from the airflow path on that aft section of above-mentioned suction tray areal of support, this airflow path with absorption disk body inner chamber communicate; Automatic switch valve on part that is arranged on airflow path, this switch valve tightly clings on the suction tray areal of support along with the absorption disk body and opens; And, a spring member that impels automatic switch valve to be in normally off, said airflow path forms in such a way, promptly causes the direction of the application force that automatic switch valve opens to be different from the direction of the antagonistic force that overcomes spring member.
This vaccum-suction attachement pad is intended to provide solution for the problem that the suction tray of proposed prior art in the flat 3-86275 of Japanese Utility Model patent application is run into.In other words, as previously mentioned, when a gondola of by wire rope suspensioning or lifting railway carriage or compartment are in bigger hoisting depth, when it is in low hoisting depth, affact the little application force of power of wall surface with a ratio, just often be easy to make the lifting railway carriage or compartment to separate from the supporting wall wall by suction tray.This may be due to the fact that, promptly the undue thrust of compression spring make the absorption disk body finish with wall surface fully contact and subsequently vacuum draw before, with regard to owing to separate from wall surface from the antagonistic force of wall surface.
For this halfway absorption of the suction tray that prevents to use, can reduce to push the spring constant of that compression spring of guiding valve, so that reduce the antagonistic force that suction tray is subjected to from wall surface at high hoisting depth; Yet when vacuum pump was activated before suction tray tightly reclines wall surface, the spring constant that has reduced can not be resisted the suction that is produced by vacuum pump, and therefore, automatic switch valve has not desirably been opened.So, can not reach the function of desired vaccum-suction attachement pad.
Constantly the result of research is, the present inventor finds now, by changing the position and the direction with respect to the airflow path of the suction tray of proposing among the flat 3-86275 of Japanese utility model application of airflow path during the vacuum draw, can make the effect minimum of windstream on compression spring of vacuum draw, so just, allow to reduce spring constant and do not influence the correct opening/closing action of guiding valve, can thoroughly be adsorbed onto gratifying vaccum-suction attachement pad on the wall surface with the remarkable antagonistic force that has reduced from wall surface thereby provide a kind of.Suction tray is according to a second aspect of the invention invented with regard to being based on such discovery, and, it is characterized in that said airflow path forms by this way, promptly cause the direction of the application force that automatic switch valve opens to be different from the direction of the antagonistic force that overcomes spring member.Because this layout has reduced to overcome the required suction of thrust of spring member, so, only use with the spring member of the corresponding less spring constant of this suction that has reduced just enough.Therefore, can reduce the antagonistic force that when suction tray tightly reclines areal of support, occurs.
Moreover, because opening the required power of automatic switch valve obtains by equation " spring force+suction force * μ (μ is a friction coefficient) ", so, the inventor recognizes, can reduce to open the required power of automatic switch valve by the value that reduces friction coefficient, and, the value of friction coefficient that a containment member reduces the slipper of automatic switch valve in fact can be set by the slipper round automatic switch valve at present.In a preferred embodiment, automatic switch valve comprises a valve body that is being pushed by spring member usually, and one is held said valve body so that the valve body accommodation tube that valve body slides within it, and, a sealing member that is provided with around said valve body accommodation tube.The sealing part prevents that dust and other exterior materials from entering between valve body and the valve body accommodation tube, and therefore the friction coefficient between them is reduced to minimum.
In addition, the inventor can reduce the size of used vacuum pump significantly, with the value that reduces friction coefficient, these all are by on the absorption disk body dust filter being installed, and realize so that more effectively prevent the slipper that dust and other exterior materials enter automatic switch valve.
Describe preferred embodiment of the present invention in detail hereinafter with reference to accompanying drawing.
In Figure of description:
Fig. 1 is the cutaway view of the vaccum-suction attachement pad of first embodiment according to the invention;
Fig. 2 is the front elevation of the embodiment of Fig. 1, in order to illustrate clear for the purpose of, wherein omitted some parts;
Fig. 3 be in Fig. 1 by the amplification of the part A of first embodiment that long and short dash line enclosed the ratiometric cutaway view;
Fig. 4 is the scheme drawing of general layout form of a vacuum pick-up system of expression, wherein, Fig. 1 to embodiments of the invention shown in Figure 3 as preventing the device that wave in a lifting railway carriage or compartment, this lifting railway carriage or compartment is used to, for example, the exterior wall surface of maintenance building;
Fig. 5 is a cutaway view, illustrates handle and is on the aft section that how to be installed to vaccum-suction attachement pad.
Fig. 6 is the cutaway view according to the vaccum-suction attachement pad of second embodiment of the present invention; And
Fig. 7 is a front elevation embodiment illustrated in fig. 6.
The detailed description of invention
Fig. 1 is the cutaway view along A-A line vaccum-suction attachement pad that got, first embodiment according to the invention among Fig. 2; Fig. 2 is a front elevation embodiment illustrated in fig. 1, has omitted some parts among the figure for the purpose of when diagram is clear.
As shown in these figures, vaccum-suction attachement pad 100 comprises that is substantially a columnar absorption disk body 1, that end (rear end) away from an exterior suction tray areal of support 30 of this absorption disk body 1 is uncovered, and areal of support 30 is exactly that suction tray 100 is wanted that surface of adsorbing by vacuum draw.Two screws 29 of dish-shaped lid 11 usefulness are fixed on the rear stub of absorption disk body 1, thereby constitute a suction chamber 12 by absorption disk body 1 and lid 11.With four screws 26 valve casing 21 cylindraceous is fixed to and covers 11 rear end, in valve casing 21, be provided with an extension and reach the slide valve 14 that covers 11 rear end surface across the inner chamber of valve casing.One guiding valve 16 is supported in the slide valve 14, so that extend through suction chamber 12 and absorption disk body 1 sensing suction tray areal of support.It is that suction tray 100 can move towards areal of support 30 that one handle 24 is fixed on the aft bulkhead of valve casing 21 one in such a way, an end of a flexible pipe 23 by an adaptor union 22 to be connected to the rear end of valve casing 21 with the mode that is formed on airflow path fluid communication in the valve casing 21, suction.The other end of flexible pipe 23 is connected to a vacuum and produces the source such as on the vacuum pump (not shown).
Dish type partition wall 9 with many circular ports is installed in the front end that adsorbs disk body 1, promptly faces that end of suction tray areal of support 30, and circular port forms aspirating chamber 10a～10f.In Fig. 1 and Fig. 2, only show a part of partition wall 9 and aspirating chamber, in order to illustrate convenient for the purpose of, remaining that part of the omission still, should be understood that on the whole surface of the front end of absorption disk body 1 to be formed with aspirating chamber and partition wall 9 everywhere.
Fig. 3 be among Fig. 1 by the amplification of the part A of first embodiment that long and short dash line enclosed the ratiometric cutaway view.As clearly shown in Figure 3, each aspirating chamber (only showing aspirating chamber 10a and 10b in Fig. 3) and suction chamber 12 are arranged to mutual fluid communication, said fluid communication realizes by through hole 7a and 7b, and, valve system 3a '～3f ' is arranged within each through hole.To describe a valve system 3a ' shown in Fig. 3 below in detail.
Be formed on the absorption disk body 1 with cooresponding that through hole of valve system 3a ' 7a, and, form by the section 8a and a large diameter section 8a ' of a minor diameter, so that present a kind of step-type profile shape.Cramp bar 2a pine loose ground is contained within the through hole 7a and extends through through hole 7a, and, this cramp bar 2a is fixed to by means of a block piece 5a on the absorption disk body 1, and block piece 5a is a cross bar shape, and it extends through the rearward end of cramp bar 2a and across the minor diameter section 8a of through hole.That end that promptly faces suction tray areal of support 30 at the front end of cramp bar 2a has been fixed a disc valve 3a, and the vertical sectional area of disc valve 3a is greater than the expanded diameter section 8a ' of through hole 7a.One spring 4a arranges round cramp bar 2a, so that extend between the step portion of the aft end face of valve 3a and through hole 7a, under the situation of the suction that is not formed by vacuum pump, spring 4a flexibly hold-off valve 3a leaves the open end (as shown in Figure 3) of through hole 7a.As shown in Figure 3, because block piece 5a is a cross bar that can not cover the rear open end of through hole 7a when its aft end face with absorption disk body 1 contacts fully, therefore, the aspirating chamber 10a that is arranged on the leading section of absorption disk body 1 is communicated with the suction chamber 12 maintenance fluids of the rearward end that is arranged on absorption disk body 1.
Can select spring 4a, so that it has such spring constant, promptly allow spring 4a during carrying out vacuum draw, to be compressed by a pressure reduction with pump, come in contact with absorption disk body 1 up to valve 3a, and, as long as vacuum draw work continues, all to utilize aspirating chamber 10a and suction between the Kong 12 pressure reduction and keep spring 4a to be in compressive state, the above-mentioned pressure reduction that causes length of spring compressed is owing to reach one continuous air flow of given a period of time from aspirating chamber 10a to continuing of aspirating of suction chamber 12 and give to valve 3a's.
Other valve system 3b '～3f ' for fear of unnecessary repetition, will no longer describe other valve system to constitute with the above-mentioned identical mode of valve system 3a '.
In addition, in the embodiment of Fig. 1 and Fig. 2, be provided with an automatic switch valve 27 on absorption disk body 1, this valve 27 is made of above-mentioned slide valve 14 and guiding valve 16.This automatic switch valve 27 is designed to be compressed against on the areal of support 30 or when areal of support 30 separates, can open or close automatically when absorption disk body 1.
As seeing from Fig. 1 and Fig. 2, automatic switch valve 27 is arranged in the position of departing from the center of adsorbing disk body 1 in the valve casing 21.The slide valve 14 of automatic switch valve 27 comprises a larger-diameter part 20 and a part 15 than minor diameter, small diameter portion 15 puts in the suction chamber 12 of absorption disk body 1 by being produced on a suction socket 28 of covering on 11, and is fixed to a fastener 25 and covers on 11.Slide valve 14 has formation guiding valve mounting hole 16a within it, has inserted a columniform guiding valve 16 that metallic material is made in mounting hole 16a, below will describe about guiding valve 16.The major diameter part 20 of slide valve 14 is contained within the slide valve accommodation tube 36 in such a way, and promptly it can endwisely slip along accommodation tube 36.
The rear end part of guiding valve mounting hole 16a is made a hole 17a who holds spring who has strengthened diameter, and compression spring 17 is contained in the 17a of this hole.The rear end of compression spring 17 is by the basal surface supporting of slide valve accommodation tube 36, so that often slide valve 14 is pushed to suction tray areal of support 30.Guiding valve 16 is arranged to and can be slided within a cylindrical spacer that is fixed on the slide valve 14, and, be provided with a compression spring 19 in the front portion of spacer 18 around guiding valve 16.
The slide valve 14 that is arranged in the valve casing 21 is designed to be able to move backward with the retraction movement of guiding valve 16, so that the front end face of major diameter part 20 breaks away from 11 the rear end surface B of uncapping, thereby allow the air in the suction chamber 12 is drawn into airflow path 13 in valve casing 21 by pump orifice 28.
Because automatic switch valve 27 departs from the center of adsorbing disk body 1 within valve casing 21, a side (see from Fig. 1 and be the left side) of deflection absorption disk body 1 is arranged, and, also depart from the center of adsorbing disk body 1, opposite side (from Fig. 1, see and the be the right side) layout of deflection absorption disk body 1 in order to the adaptor union 22 that airflow path 13 is linked to each other with flexible pipe 23, therefore, this airflow path 13 is moving the direction opened transverse direction guiding air mutually with automatic switch valve 27, rather than is opening the identical Direction guide air of direction with this.Because this layout, the direction (that is: the direction of the windstream of suction) that causes the adsorption affinity of vaccum-suction attachement pad moves the bias force that overcomes compression spring 17 and 19 with automatic switch valve 27 and the direction of opening traversed mutually.Therefore, with respect to the direction of opening of automatic switch valve 27, suction radially works.In addition, in this embodiment, airflow path 13 with in order to arrange that compression spring 17 separates fully with that inner space of 19, flows to the inner space so that prevent the air of vacuum draw.
The vaccum-suction attachement pad of the present invention 100 of constructing by Fig. 1～mode shown in Figure 3 is fixedly secured to a tip with the arm mechanism (not shown) of handle 24 or similar component manipulation.Suction tray 100 is adsorbed onto on the areal of support 30 in the following manner.
One end of flexible pipe 23 is being connected on the adaptor union 22 of vaccum-suction attachement pad 100, after the other end is connected on the vacuum pump, the starting vacuum pump.In this stage, the guiding valve 16 of automatic switch valve 27 is compressed spring 17 and 19 and pushes away forward, and therefore, the major diameter part 20 of slide valve 14 closely is pressed against with its front end face and covers on 11 the aft end face B, thereby switch valve 27 is placed closed condition.
Then, when vaccum-suction attachement pad 100 is pressed against on the suction tray areal of support 30 by not shown arm mechanism, the guiding valve 16 of automatic switch valve 27 begins tightly to recline areal of support 30, thus, make guiding valve 16 overcome the bias force of compression spring 17 and 19 and withdraw, thus, front end face breaks away from 11 the aft end face B of uncapping.So pump orifice 28 is just with airflow path 13 fluid communication, and be communicated with the vacuum pump fluid to the greatest extent, at this moment, the air in the suction chamber 12 just begin to be extracted out by vacuum pump.
In Fig. 3, in case the suction of the air in the suction chamber 12 begins, the air within the aspirating chamber 10a just flows to suction chamber 12 by suction socket 6a and through hole 7a.
At this moment, if aspirating chamber 10a is with the smooth part closed contact of suction tray areal of support 30, then aspirating chamber 10a just is separated wall 9 and areal of support 30 seals fully, therefore, air within the aspirating chamber 10a just is drawn in the suction chamber 12 immediately, so, do not have the windstream of time length greater than the suction of a preset time section.Therefore, chamber 10a is just because of vacuum draw is adsorbed onto on the areal of support up hill and dale, unless valve 3a is closed.On the contrary, if aspirating chamber 10a contacts with the uneven part of suction tray areal of support, so, during aspiration vacuum, the windstream that has one suction enters suction chamber 12 from aspirating chamber 10a, valve 3a gradually to pusher, is pressed the front end face that adsorb disk body 1 up to it by the windstream of this suction, thereby closes suction socket 6a fully.In case press the front end face that adsorbs disk body 1 like this, then remain on the state of this compression owing to the pressure reduction between the air pressure (almost being vacuum) in air pressure (bar pressure) in the aspirating chamber and the suction chamber 12.Like this, during utilizing vacuum pump to carry out vacuum draw, can prevent to be adsorbed onto never fully the air that leaks among the aspirating chamber 3a on the areal of support 30 and flow to suction chamber 12.
The suction tray 100 of Bu Zhiing in the manner described above, although have unevenness on the areal of support 30, it also can be adsorbed onto on the areal of support 30 reliably, and, also will not reduce the degree of vacuum that reaches in the suction chamber 12.Therefore, this suction tray 100 can improve the degree of vacuum that reaches in the aspirating chamber that is applied on the flat surfaces, and the degree of vacuum that reaches in the whole vaccum-suction attachement pad is maintained a desirable degree.Like this, the air in the absorption disk body 1 is drawn into vacuum pump via airflow path 13 and flexible pipe 23.
Be connected at the suction tray above-mentioned 100 under the situation of same vacuum pump several, when the absorption of implementing the suction tray surface, if any one absorption disk body 1 is in areal of support 30 bad state of contact among the suction tray 100, so, this suction tray can be avoided bad vacuum draw and without any need for special operation, this is because the corresponding slide valve 14 that the automatic switch valve 27 of this suction tray is compressed against on the end face of absorption disk body 1 remains on closed condition, and vacuum draw only carries out in the suction tray of another and areal of support 30 closed contacts.
In addition, according to this embodiment, in order to break away from the suction tray 100 that is adsorbed onto on the areal of support, as shown in Figure 5, be provided with an air drain passage 41, this passage by being formed on suction socket 40 covering on 11 with suction chamber 12 fluid communication, Fig. 5 is a cutaway view, expression handle 24 is the rear portions that how to be installed in vaccum-suction attachement pad 100.In order to connect suction socket 40 and air drain passage 41 and to hold in the valve chamber 39 of arm 37 of handle 24 valve 39 and a spring 38 have been installed, spring 38 always pushes valve 37, makes it close suction socket 40, simultaneously, and the arm 37 of pushing handle forwards also.Only, make suction chamber 12 and air drain passage 41 mutual fluids be communicated with, just can separate suction tray 100 from areal of support 30 by pulling back handle 24.Another kind of scheme is, as prior art, can be under the situation of off in vacuum generation source, supplies suction chamber 12 from the outside air.In case by flexible pipe 23 supply air, then air transmits suction chamber 12 by airflow path 13 and suction socket 28.Then, under the situation of the aspirating chamber of the surface portion that is applied to not have non-flatness, the suction socket 6a of this air by the valve system opened the at that time 10a that enters the room is so that the vacuum state in the cancellation chamber 10a.On the contrary, if aspirating chamber 10a is applied on the surface portion with unevenness, then no longer have pressure reduction between aspirating chamber 10a and the suction chamber 12, therefore, valve 3a is pushed away forward by spring.Like this, the vacuum state in the suction tray 1 just is cancelled.
Next, prevent to be described to utilizing vaccum-suction attachement pad 100 with reference to Fig. 4 in the situation that wave in lifting operation, that suspending in midair railway carriage or compartment, wall surface.
This lifting railway carriage or compartment (not shown) comprises left and right vaccum-suction attachement pad 100a and the 100b that a pair of arm mechanism (also not shown) that passes through separately is provided with, and a common vacuum pump 33 links to each other with 100b with vaccum-suction attachement pad 100a respectively with 23b by flexible pipe 23a.Reference number 31a and 31b represent check valve, 32 expression compression indicators, 34 expressions, one plug, and 35 expressions, one three-phase 200V power supply.
Carry two machines on the lifting railway carriage or compartment, so that promote/fall the lifting railway carriage or compartment along the wall surface, and the lifting railway carriage or compartment that machine is housed by two wire rope suspensionings.
Still in this case, because each suction tray tightly abuts on the wall surface by arm mechanism, without any need for special operation, and even when two suction trays can not tightly recline wall surface in correct mode simultaneously, vacuum draw begins sequentially to carry out from the suction tray that at first reclines, therefore, can realize appropriate vacuum suction at an easy rate, therefore, can prevent that the lifting railway carriage or compartment of suspending in midair from waving.
The preferred embodiment on being applied to the lifting railway carriage or compartment of carrying out work on wall surface the time is described above, but, should be appreciated that this embodiment can also be applied to by wire rope suspensioning, in order to promote/any other work machine of the hybrid motion of descending motion or lifting/descending motion and horizontal motion.
Above-mentioned arm mechanism can be any suitable structure, for example, can select the quantity of arm or the degree of freedom of arm according to user's requirement.In addition, each above-mentioned member can improve under the premise without departing from the spirit and scope of the present invention in every way.
In addition, though the foregoing description has used when suction tray and areal of support closed contact or SELF CL or open the automatic switch valve 27 of airflow path 13 when disengaging, but, also a hand switch valve can be set between valve casing 21 and flexible pipe 23, to replace automatic switch valve 27.On the other hand, no matter be automatic or manually operated, can save this switch valve.
As described so far, suction tray 100 according to first embodiment is characterised in that, that fore-end facing to areal of support of absorption disk body is separated wall and is separated into many little aspirating chambers, and each aspirating chamber all communicates with a suction chamber at the rear portion that is arranged on the absorption disk body; And, in each airflow path that each aspirating chamber is communicated with suction chamber, valve system is set by this way, can utilize the windstream of the suction that produces by vacuum draw to make valve close.Because these characteristics make the present invention to produce appropriate vacuum draw in suction tray, can not have inadequate or unsuccessful absorption, even also be like this when suction tray being applied on the uneven surface.
In addition, present embodiment does not need complicated control just to realize this appropriate absorption in a simple manner.
Describe second embodiment of the present invention with reference to Fig. 6 and Fig. 7 below, wherein, Fig. 6 is the cutaway view according to the vaccum-suction attachement pad 200 of second embodiment of the present invention, and Fig. 7 is a front elevation embodiment illustrated in fig. 6.
As shown in these figures, vaccum-suction attachement pad 200 comprises that is substantially a columnar absorption disk body 51, that end (front end) facing to suction tray areal of support 30 of this absorption disk body 51 is uncovered, areal of support 30 is exactly that face that suction tray 200 will adsorb by means of vacuum draw, made the groove 52 of an opening facing to areal of support 30 along the outer peripheral edges of absorption disk body 51, peripheral groove 52 is forwards to the trapezoidal cross sectional shape that reduces gradually; That is: the front end of peripheral groove 52 is narrower than its bottom.
Within the peripheral groove 52 of absorption disk body 51, an elastic sealing element 53 that includes a foam-rubber cushion has been installed tightly.Sealing part 53 have a shape of cross section triangular in shape, reach top outside the groove 52 and one be the quadrangular cross section shape and by himself flexible fastening be installed in bottom within the peripheral groove 52.
Similar with first embodiment, this second embodiment comprises an automatic switch valve 54 that is arranged on the absorption disk body 51, and this valve is designed to when absorption disk body 1 is pressed against on the areal of support 30 or when areal of support 30 separates and can open or close automatically.
As from Fig. 7, seeing, with four screws 56 valve casing 55 cylindraceous is fixed on the aft end face of absorption disk body 51, and, automatic switch valve 54 depart from adsorb disk body 51 center arrangement within valve casing 55.Automatic switch valve 54 comprises a slide valve 61, this slide valve 61 is made up of a major diameter part 61a and a small diameter portion 61b, small diameter portion 61b passes the inner chamber that the pump orifice 62 that is formed on the absorption disk body 51 puts in absorption disk body 51, and be fixed on the absorption disk body 51 by means of guiding valve supporting fastener 69, slide valve 61 has a guiding valve mounting hole 57, held a cylindrical slide valve 60 of making by metallic material in this mounting hole, the major diameter part 61a of slide valve 61 is contained within the slide valve accommodation tube 80, so that endwisely slip along tube 80.
The rear end part of guiding valve mounting hole 57 is made a hole 57a who lays spring who has strengthened diameter, one compression spring 64 just is placed within the 57a of this hole, the rear end of compression spring 57 is by the bottom surface supporting of tube 80, so that always slide valve 61 is pushed to areal of support 30, guiding valve 60 can slide along spacer in a cylindric spacer 71 that is fixed on the slide valve 61, is provided with another compression spring 64b in the front of this spacer 71 round guiding valve 60.
Under the situation that vaccum-suction attachement pad 200 does not contact with areal of support 30, the front end face of the major diameter part 61a of slide valve 61 is along the periphery of pump orifice 62 and the aft end face B maintenance closed contact of absorption disk body 51, so that automatic switch valve 54 is remained on closed condition.Each comfortable one end of compression spring 64a and 64b has a flange section, so that running in such a way, promptly, when guiding valve 60 is withdrawn on the areal of support 30 because of just being pressed against, the compression of compression spring 64a at first takes place, and the compression of compression spring 64b can only just be ensued after spring 64a has finished its compression.Because this sleeve-type of compression spring 64a and 64b is arranged, make it possible in the enough strokes that guarantee whole guiding valve, the length of valve casing 55 is reduced to minimum, yet, if do not need to limit the length of valve casing 55, can replace above-mentioned two compression spring 64a and 64b with a compression spring, slide valve 61 moves backward with the retraction movement of guiding valve 60, therefore, the front end face of said major diameter part 61 breaks away from the aft end face B of absorption disk body 51, so that allow the air within absorption disk body 51 inner chambers is drawn into the airflow path 58 that is positioned within the valve casing 55 by pump orifice 62.
In addition, in this second embodiment, has the front end that dust filter 63 that 156 purpose cloth make is installed in absorption disk body 51 to one by per 100 inches, to cover the opening that surrounds into by elastic sealing element 53.This dust filter 63 prevents that dust, impurity and other exterior materials in the atmosphere from entering the inner chamber of suction tray 200, particularly, filter 63 prevents to influence the smooth slip of slide valve 61 with respect to accommodation tube 80 between slide valve 61 and the slide valve accommodation tube 80 because of exterior materials enters.Because floating dust in the atmosphere, impurity and other exterior materials are easy to enter vacuum pump, therefore, past is that a large-sized dust filter is installed on the pump, be difficult to reduce the overall dimensions of traditional vacuum pump like this, and heavy vacuum pump is one of the reason of the bad operability in the lifting railway carriage or compartment of suspending in midair, yet, the layout of above-mentioned second embodiment can reduce the size of dust filter significantly, therefore, obtain the vacuum pump of a compact conformation, thereby provide highly reinforced operability, in addition, in order to prevent that more effectively exterior materials from entering between slide valve 61 and the slide valve accommodation tube 80, around the outer peripheral face of slide valve 61 and slide valve accommodation tube 80 be provided with one by, for example, the automatic telescopic 68 that is corrugated tube shape that poly-chloroprene rubber is made.During vacuum draw, difference of pressure occurs, can on cover 68, make the air extractor vent of several minor diameters.
One hose coupling 65 communicates to be installed on the valve casing 55 and with vacuum pump 72 with airflow path 68 and links to each other.
The vaccum-suction attachement pad 200 of constructing in a manner described is fixed on the tip of the arm mechanism (not shown) of handling by handle 67 or other member, this suction tray 200 is to be adsorbed onto on the areal of support 30 with suction tray 100 identical modes according to first embodiment, therefore, be how to be adsorbed onto that this paper no longer is described in detail on the areal of support 30 for suction tray 200.
Be connected at the suction tray above-mentioned 200 under the situation of same vacuum pump 72 several, when the absorption of implementing the suction tray surface, if any one absorption disk body 51 is in areal of support 30 bad state of contact among the suction tray 200, so, because the automatic switch valve 54 of the suction tray 200 of this bad contact is compressed against the corresponding slide valve 61 of the end face of absorption disk body 51 and remains on closed condition, and, vacuum draw only carries out in the suction tray of another (or some) and areal of support 30 closed contacts, therefore, present embodiment can be avoided bad vacuum draw effectively, without any need for special operation.
In addition, according to this embodiment, foam-rubber cushion or elastic sealing element 53 by the special shape of himself elasticity and groove 52 and be fixed to very simply in the groove 52, needn't use any adhesive agent, therefore, only by worn-down or the foam-rubber cushion 53 that damaged are pulled out groove 52, just can be apace with a new replacement it.
Should be appreciated that vaccum-suction attachement pad 200 certainly also can be valuably as preventing the device that wave in the lifting railway carriage or compartment of suspending in midair of operation on a wall surface, fully as description shown in Fig. 4 and suction tray 100 relevant first embodiment in front.
Similarly, in second embodiment of the anti-sway device that is used as the lifting railway carriage or compartment of suspending in midair, because each suction tray 200 abuts against on the metope by corresponding arm mechanism, without any need for special operation, and, vacuum draw begins sequentially to carry out from the sucker that reclines at first, therefore, promptly two suction trays of box lunch also can be realized correct vacuum suction at an easy rate not simultaneously so that correctly mode is close to metope, as a result, can prevent effectively that the lifting railway carriage or compartment of suspending in midair from waving.
Situation when below being applied on the lifting railway carriage or compartment of suspending in midair of operation on a metope with regard to second embodiment is described, but, should be understood that present embodiment can also be applied to by wire rope suspensioning, in order to any other work machine of the hybrid motion that realizes lifting/descending motion or lifting/descending motion and horizontal motion.
Arm mechanism can be any suitable structure, and this will decide according to the purposes of expectation, for example, can select the quantity of arm and the degree of freedom of arm according to user's requirement.In addition, each above-mentioned member can improve under the premise without departing from the spirit and scope of the present invention in every way.
For example, adhere to along the set foam-rubber cushion (elastic sealing element) of the periphery of front end of absorption disk body any other suitable manner outside can be in the above described manner, in other words, can resemble conventional, known, adhere to foam-rubber cushion with adhesive agent, perhaps proposed in the flat 3-86275 of Japanese utility model application, foam-rubber cushion is flexibly imbedded in the peripheral groove, this groove is formed on that side that faces the suction tray areal of support of absorption disk body, and it has such trapezoidal cross sectional shape-promptly: its opening is towards areal of support, and the width of trapezoidal bottom is greater than the width of open end.
In the above among the embodiment of Miao Shuing, though be described to being formed in the airflow path 58 that direction that the direction that moves with automatic switch valve and open traverses mutually extends, but, this airflow path can be made along extending with the direction bevelled direction of opening of automatic switch valve, in addition, airflow path 58 can be made energy scattering windstream, so that the Direction guide portion of air of opening along automatic switch valve flows, in addition, in the above-described embodiments, though airflow path is distinct with that inner chamber of laying compression spring, but, this passage can also be arranged to communicate with the space of some or all of layout spring, and this airflow path can form in every way, as long as it can suitably reduce in order to overcome the pull of vacuum of the spring biases strength.
Just as described thus far, the invention is characterized in that airflow path is with so a kind of Mode forms, and namely causes the direction of that active force that automatic switch valve opens to be different from gram Take the direction of the reaction force of spring member, because this arrangement form has reduced in order to overcome That suction of the thrust of spring member, so, use corresponding with this suction that has reduced The spring member of little spring constant just enough, therefore, the present invention can reduce when inhaling Reaction force when attached dish abuts on the bearing-surface, thus solved when being in big lifting height When spending, the accidental problem that separates from bearing-surface of absorption disk body.
Claims (4)
1. vaccum-suction attachement pad comprises:
One is suitable for utilizing pull of vacuum and tightly clings to absorption disk body on the exterior suction tray areal of support that it wants to adsorb;
It is characterized in that described vaccum-suction attachement pad also comprises:
Suction chamber that is arranged on this absorption disk body away from that rearward end of above-mentioned suction tray areal of support, this absorption disk body, be separated wall facing to that fore-end of above-mentioned suction tray areal of support and be separated into several aspirating chambers, each aspirating chamber is communicated with described suction chamber respectively;
One for being communicated with the airflow path that suction chamber is provided with; And,
Be arranged on the valve system on the air flow path between each aspirating chamber and the suction chamber, each valve system comprises:
The valve that diameter is bigger than the diameter of air flow path;
Be fixed to valve and the loose cramp bar that is received on the air flow path with holding;
Be located at cramp bar away from the end of valve, be used for preventing that valve from getting loose enters the block piece of aspirating chamber; And
The spring that is provided with around cramp bar, does not open on this spring bias valve road that maintains the circulation of air when having difference of pressure between aspirating chamber and the suction chamber, and when having difference of pressure between aspirating chamber and the suction chamber, this spring is compressed by difference of pressure;
And this valve system can be closed by the windstream of the suction that is occurred during the vacuum draw.
2. vaccum-suction attachement pad comprises:
One is suitable for utilizing pull of vacuum and tightly clings to absorption disk body on the exterior suction tray areal of support that it wants to adsorb;
It is characterized in that described suction tray also comprises:
Airflow path that is arranged on this absorption disk body away from that aft section of above-mentioned suction tray areal of support, this airflow path communicates with the inner chamber of absorption disk body,
Automatic switch valve on part that is arranged on above-mentioned airflow path in such a way, that is: this switch valve is along with tightly clinging on the suction tray areal of support and open; And, being arranged on the spring installation on the above-mentioned automatic switch valve, described spring installation is oppressed described automatic switch valve closes and along with tightly clinging on the suction tray areal of support and be compressed its normality;
Above-mentioned airflow path forms in such a way, that is, cause the direction of the application force that automatic switch valve opens to be different from the direction of the antagonistic force that overcomes said spring installation.
3. vaccum-suction attachement pad as claimed in claim 2, it is characterized in that, described automatic switch valve comprises a valve body that is pushed by the spring installation normality, one is held this valve body so that the valve body accommodation tube that valve body slides within it, and a containment member of establishing around said valve body accommodation tube.
4. vaccum-suction attachement pad as claimed in claim 2 is characterized in that, also comprises a dust filter that is installed on the absorption disk body, enters the inner chamber of absorption disk body to prevent dust and other exterior materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95109135A CN1046482C (en) | 1995-06-22 | 1995-06-22 | Vaccum-suction attachement pad |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95109135A CN1046482C (en) | 1995-06-22 | 1995-06-22 | Vaccum-suction attachement pad |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1138553A CN1138553A (en) | 1996-12-25 |
| CN1046482C true CN1046482C (en) | 1999-11-17 |
Family
ID=5077061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95109135A Expired - Fee Related CN1046482C (en) | 1995-06-22 | 1995-06-22 | Vaccum-suction attachement pad |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1046482C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966659B (en) * | 2012-11-27 | 2014-12-10 | 吉林大学 | Universal vacuum chuck with automatic closing function |
| CN103465194A (en) * | 2013-09-12 | 2013-12-25 | 昆山市巴城镇顺拓工程机械配件厂 | Absorption type carrying platform |
| CN104295594A (en) * | 2014-11-07 | 2015-01-21 | 李富雄 | Vacuum adsorbing hook |
| CN108180211B (en) * | 2016-11-01 | 2020-04-10 | 德化县丽德家居用品有限公司 | Suction cup |
| EP3536650B1 (en) * | 2018-03-09 | 2020-11-11 | J. Schmalz GmbH | Control device for a hose lifter and hose lifter |
| DE102019103251B4 (en) * | 2019-02-11 | 2022-05-25 | Fipa Holding Gmbh | DEVICE FOR CONTROLLING THE FUNCTION OF A VACUUM LIFTING DEVICE AND VACUUM LIFTING DEVICE WITH SUCH CONTROL DEVICE |
| DE102019104807A1 (en) * | 2019-02-26 | 2020-08-27 | Fipa Holding Gmbh | VACUUM LIFTING DEVICE |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3591228A (en) * | 1968-06-17 | 1971-07-06 | David John Tudor Webb | Suction pads |
| US4236693A (en) * | 1977-07-21 | 1980-12-02 | Mccrea Elmer R | Portable winch apparatus |
-
1995
- 1995-06-22 CN CN95109135A patent/CN1046482C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3591228A (en) * | 1968-06-17 | 1971-07-06 | David John Tudor Webb | Suction pads |
| US4236693A (en) * | 1977-07-21 | 1980-12-02 | Mccrea Elmer R | Portable winch apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1138553A (en) | 1996-12-25 |
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