CN104235666B - Counter-jib lamp - Google Patents
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- CN104235666B CN104235666B CN201310233294.8A CN201310233294A CN104235666B CN 104235666 B CN104235666 B CN 104235666B CN 201310233294 A CN201310233294 A CN 201310233294A CN 104235666 B CN104235666 B CN 104235666B
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Abstract
The present invention utilizes the passive type cable-tension system with right angle △ ABC two strands He the construction of a+b=2 √ 2R.sin (A+ π/4) functional expression institute, the moment that arm is applied by antagonism centrifugal force, the arm making counter-jib lamp can be still in the position of stretching, extension and not sagging, to the cable-tension system force application location point to front arm, it is optimized configuration, make cable-tension system can play greatest benefit, make arm lower than in the vertical space of elevation of water simultaneously, when rotating vertically downward, the tension force of the cable-tension system that arm is subject to, will not as tradition passive type counter-jib lamp, present the moment that centrifugal force causes to successively decrease, metal spring is stretched on the contrary, the phenomenon that tension force increases on the contrary.
Description
Technical field
The present invention relates to a kind of counter-jib lamp utilizing passive type tension system, particularly relate to a kind of utilization cable-tension system based on the dynamic governor motion of guy cable length of sine, to balance the counter-jib lamp of the moment impact that arm is caused by centrifugal force, for the cable-tension system force application location point to counter-jib, it is optimized configuration, makes cable-tension system can play greatest benefit.
Background technology
Counter-jib lamp be a kind of have can folding, extensile arm light fixture, can be competent at various illumination needs, and is the common equipment of household and working space.
It is said that in general, counter-jib lamp has the structure of similar human arm, except the structures such as light source and lampshade, there is the structures such as front arm, joint portion, rear arm, pedestal.
Light source and lampshade structure are arranged at the front end of front arm, and the rear end of front arm is connected by joint portion and rear arm, and joint portion has pivot structure, make the front arm can on a vertical, downward folding or be lifted up；The rear end of rear arm connects pedestal, between rear arm and pedestal, it is however generally that, it may have pivot structure, relative to pedestal, rear arm appropriateness can adjust inclination angle doing and horizontally rotate.
If not specializing below, front arm and rear arm are all referred to as arm, when arm tilts or stretches, the moment loading that centrifugal force produces can be subject to, and have sagging trend, the tension force of tension system and the frictional force of pivot structure or other reciprocal trimming moments must be relied on, resist centrifugal force, arm just can be made to rest on or the position of stretching, extension is not sagging.
The arm of counter-jib lamp, when extending to horizontal level, the moment that arm is produced by centrifugal force is maximum, and now the tension system of arm should have enough tension force, and to resist the moment that centrifugal force produces, the arm making stretching, extension can be static and not sagging.
But, the tension force of the tension system of conventional balanced arm lamp arm, proportional with the length that extension spring is stretched, during the folding downward by horizontal level of counter-jib lamp arm, extension spring can be stretched longer, therefore results in bigger spring tension.This result, run in the opposite direction with being actually needed, because during the folding downward by horizontal level of counter-jib lamp arm, the moment that arm is produced by centrifugal force is successively decreased, and extension spring is stretched longer on the contrary, is pernicious, the arm causing counter-jib lamp can not wide-angle folding, or because downward folding angle is relatively big, extension spring is stretched to the limit, makes extension spring easily tired.Such as: american documentation literature US2,076,446, US2,787,434, US5,016,153 etc., there is similar problem.
Summary of the invention
Technical solution of the present invention, utilize the cable-tension system of the dynamic governor motion of guy cable length based on sine, to balance the moment impact that arm is caused by centrifugal force, for the cable-tension system force application location point to counter-jib, it is optimized configuration, makes cable-tension system can play greatest benefit.
For solving traditional problem and reaching the purpose of the present invention, the concrete technological means of the present invention is achieved in that following announcement:
A kind of counter-jib lamp, it is characterized in that, at least include a counter-jib, one cable-tension system, one counter-jib support, one pedestal, described cable-tension system includes a drag-line, one round metal wire spring, the one dynamic governor motion of guy cable length, the dynamic governor motion of described guy cable length is according to two strands of right angle and a+b=2 √ 2R.sin (A+ π/4), ∠ C=pi/2, 0 < ∠ A < pi/2, functional expression construction, the described cable-tension system distance to the force application location point of counter-jib with the horizontal rotating shaft of counter-jib, for the circumradius of described right angled triangle 2.4 times；The dynamic governor motion of described guy cable length, including: a moment pillar, a fixed arm, a lever arm, a horizontal rotating shaft；Described moment pillar, fixed arm, lever arm length are equal, with horizontal rotating shaft for axle center, are radially arranged, its position, end end, are respectively provided with moment pillar pulley, fixed arm pulley, lever arm pulley；Described moment pillar and fixed arm, centered by horizontal rotating shaft, moment pillar is positioned at the top of horizontal rotating shaft, in a symmetrical line rigid structure, constitutes the string limit of the dynamic governor motion right angled triangle of guy cable length；The string limit of described right angled triangle, is perpendicularly fixed on described counter-jib support；Described round metal wire spring is a tension spring, first end of round metal wire spring is fixed on counter-jib support, second end of round metal wire spring is connected with the first end of drag-line, and the second end of drag-line is by, after the dynamic governor motion of guy cable length, forcing in the force application location point of counter-jib；When second end of drag-line is by guy cable length dynamic governor motion, sequentially straddled fixed arm pulley, lever arm pulley and moment pillar pulley, drag-line between fixed arm pulley and lever arm pulley, lever arm pulley and moment pillar pulley, respectively constitutes two strands of right angled triangle of the dynamic governor motion of guy cable length；Described horizontal rotating shaft is vertical with the plane of described right angled triangle, described lever arm and described counter-jib are rigid structures, with described horizontal rotating shaft for axle center synchronous axial system, the relativeness of lever arm and counter-jib is when counter-jib is when horizontal level, right angled triangle is isosceles right triangle state, and when counter-jib rotates, the right-angled apices of right angled triangle, can along with the lever arm of the dynamic governor motion of guy cable length synchronizing moving on right angled triangle circumscribed circle semicircle camber line.
According to aforesaid counter-jib lamp, counter-jib support (2) includes a rack rod (20) and a vertical rod vertical rotation axis (21), rack rod (20) is a hollow circular cylinder, round metal wire spring (S) is arranged in rack rod (20), fixation means (22) and the vertical rod vertical rotation axis (21) of round metal wire spring S is arranged at the bottom of rack rod 20, vertical rod vertical rotation axis (21) and pedestal (3) are to rotate to combine, and vertical rod vertical rotation axis (21) can horizontally rotate in pedestal (3).
According to aforesaid counter-jib lamp, counter-jib support is an expansion link, it includes the fixing bar being fixed on pedestal and a motion bar, fixing bar is a hollow cylindrical vertical rod, motion bar can stretch in fixing bar or rotate, motion bar is a hollow circular cylinder, motion bar is internally provided with round metal wire spring, the bottom of motion bar is fixed in one end of round metal wire spring, the other end of round metal wire spring is connected with drag-line, expansion link also has locking device, can lift or rotate motion bar and be locked to appropriate location again.
According to aforesaid counter-jib lamp, counter-jib includes plane parallel four-bar device and an adjutage, the base shaft of plane parallel four-bar device is a part for the dynamic governor motion fixed arm of guy cable length, on the connecting rod of plane parallel four-bar device, it is provided with the rotating shaft mechanism being combined with adjutage, this rotating shaft mechanism has a vertical rotation axis, and adjutage can utilize the vertical rotation axis of rotating shaft mechanism to do to horizontally rotate, and the far-end of adjutage is provided with lampshade and lamp holder facility.
According to aforesaid counter-jib lamp, the rotating mechanism of counter-jib has a block body mechanism, makes counter-jib only up to be raised to horizontal level, and counter-jib from horizontal level, can only rotate vertically downward, it is impossible to is rotated up；The cable-tension system distance length to the force application location point of counter-jib to horizontal rotating shaft, equal to 2.4 times of the dynamic governor motion right angled triangle circumradius of guy cable length.
Accompanying drawing explanation
For further illustrating the technology contents of the present invention, below in conjunction with embodiment and accompanying drawing describe in detail as after, wherein:
Fig. 1 present invention illustrates figure based on the principle of sine.
The dynamic governor motion embodiment of guy cable length utilized in Fig. 2 present invention illustrates figure.
Fig. 3 optimizes the explanation figure of force application location point.
Fig. 4 one embodiment of the invention schematic diagram.
One application examples of Fig. 5 present invention illustrates figure.
Another application examples of Fig. 6 present invention illustrates figure.
Detailed description of the invention
Technical solution of the present invention, will coordinate accompanying drawing, describe in detail.
The technological core of the present invention is based on the cable-tension system of sine, is first illustrated by the principle of the technology of the present invention core.
Fig. 1 is the present invention cable-tension system principle explanation figure based on sine.In Fig. 1, a, b, c are the opposite side of the ∠ A of △ ABC, ∠ B, ∠ C, and according to sine, a/sinA=b/sinB=c/sinC=2R, wherein, R is the circumradius of △ ABC.
When to make ∠ C be right angle, △ ABC is right angled triangle, and the opposite side of ∠ C is string limit c, and the length of string limit c is 2R, a and b is two strands.When ∠ C summit C moves on the circumscribed circle circular arc being radius with R, for instance mobile to C1 point position, △ ABC all remains right angled triangle.According to sine, right angle △ ABC two strands and a+b=2R (sinA+sinB)=2R (sinA+cosA).
Further accordance with, sinusoidal wave any linear combination that same cycle but out of phase move is have same period but the sinusoidal wave characteristic that moves of out of phase, when the linear combination of sine and cosine wave, Wo Menyou: msinx+ncosx=√ (m^2+n^2) × sin (x+ φ)；
Above-mentioned m, n are arbitrary constants, φ=arctan (n/m)；
Order: m=1, n=1, then sinx+cosx=√ 2 × sin (x+ π/4)
Obtain formula 1: right angle △ ABC two strands and a+b=2 √ 2R × sin (A+ π/4)；
Formula 1 shows, right angle △ ABC two strands and (a+b) are SIN functions, and phase contrast is π/4.When ∠ A=π/4, △ ABC is isosceles right triangle, and two strands is maximum with a+b, a+b=2 √ 2R (maximum)；
According to formula 1 and Fig. 1, the right-angled apices C of right angle △ ABC, leaving △ ABC is isosceles right triangle position, and when moving on semicircle camber line, two strands are gradually reduced with a+b, a → 0 when ∠ A → 0, a+b → 2R (minima), b → 0 when ∠ A → pi/2, a+b → 2R (minima), the difference of the maxima and minima of two strands and a+b is 2 √ 2R-2R, 0 < ∠ A < pi/2.The right-angled apices C of display right angle △ ABC, leaving △ ABC is isosceles right triangle position, when circumscribed circle semicircle camber line moves, two strands are decreased to minima 2R with a+b by maximum 2 √ 2R, and maximum length is changed to: Δ (a+b) (maximum)=2 √ 2R-2R=0.8R.
This represents, if a, b two strands is the part drag-line of a cable-tension system, the then right-angled apices C of right angle △ ABC, leaving △ ABC is isosceles right triangle position, when moving on circumscribed circle semicircle camber line, the total length of this cable-tension system is not only stretched, on the contrary can because of a, b two strands and reduction, and discharge some drag-lines, entirely different with the behavior that the passive type tension system of conventional balanced arm lamp arm is stretched.
Fig. 2 is the cable-tension system explanation figure utilized in the present invention.Fig. 2 is shown that a passive type counter-jib system, utilize the principle of above-mentioned formula 1, it is possible to design a mechanism being different from tradition passive type cable-tension system, make the moment variations relation that counter-jib is produced by centrifugal force, length with extension spring is stretched, no longer runs in the opposite direction.
In Fig. 2, counter-jib 1 is with horizontal rotating shaft X for axle center, and energy vertical up-or-down movement, horizontal rotating shaft X is perpendicular to the plane that moves both vertically of counter-jib 1.Cable-tension system 100 includes drag-line T and round metal wire spring S, and round metal wire spring S is a tension spring, and drag-line T is by, after a dynamic governor motion 101 (representing with chain line) of guy cable length, forcing in the force application location point D of counter-jib 1.nullThe dynamic governor motion 101 of described guy cable length，It is utilize the characteristic of above-mentioned right angled triangle two strands and functional expression to implement construction，With right angled triangle △ ABC，Based on framework，Two gangs of a of the right angle △ ABC of the dynamic governor motion 101 of guy cable length、B is a part of the drag-line T of cable-tension system 100，Counter-jib 1 is when horizontal level，Right angle △ ABC is isosceles right triangle state，And when counter-jib 1 rotates，The right-angled apices C of right angle △ ABC，Can along with frame for movement synchronizing moving on right angle △ ABC circumscribed circle semicircle camber line，Then in cable-tension system 100，By two gangs of a of △ ABC、The part drag-line of b composition，Change will be synchronized according to the functional expression of above-mentioned right angle △ ABC two strands and a+b=2 √ 2R.sin (A+ π/4)，Wherein，0 < ∠ A < pi/2.
Because whole cable-tension system 100 is made up of drag-line T and round metal wire spring S, and drag-line this body length of T is constant, the length change of two bursts of therefore described sums, is from the length change of round metal wire spring S self.When the length of two bursts of sums is longer, represent that the length of round metal wire spring S is elongated, when the length of two bursts of sums is shorter, represent that the round metal wire spring S length being stretched reduces.
Owing to counter-jib 1 is when the horizontal level vertical with centrifugal force, the centrifugal force moment being subject to is maximum, therefore counter-jib 1 is when horizontal level, round metal wire spring S should be at maximum tension state, to provide maximum tension, that is the drag-line total length of cable-tension system should be at maximum state, the length of two bursts of sums should be maximum.
According to formula 1, right angle △ ABC two strands and a+b=2 √ 2R.sin (A+ π/4), two strands is when ∠ A=π/4 with maximum, that is when △ ABC is isosceles right triangle.Therefore, counter-jib 1 is when horizontal level, and right angle △ ABC should be isosceles right triangle state, and round metal wire spring S is in maximum tension state, to provide maximum tension.So, when counter-jib 1 leaves horizontal level, the tension force of cable-tension system will present and successively decrease, and correct the moment variations relation that counter-jib is produced with centrifugal force by the tension force of conventional balanced arm passive type cable-tension system, be the shortcoming run in the opposite direction sometimes.
According to the above-mentioned principle based on sine, the dynamic governor motion 101 (representing with chain line) of guy cable length of the present invention a kind of counter-jib lamp, specifically including: a moment pillar 102, its end end is provided with a moment pillar pulley 103；One fixed arm 104, its end end is provided with a fixed arm pulley 105；One lever arm 106, its end end is provided with a lever arm pulley 107；
Described moment pillar 102, fixed arm 104, lever arm 106, length is equal, it is equal to the radius R of right angle △ ABC circumscribed circle, with horizontal rotating shaft X for axle center, it is radially arranged, wherein, moment pillar 102, fixed arm 104, centered by horizontal rotating shaft X, in a symmetrical linear structure, the string limit of form right angle △ ABC；Online between online, lever arm pulley 107 and fixed arm pulley 105 between moment pillar pulley 103 and lever arm pulley 107, two strands of the right angled triangle of the composition dynamic governor motion 101 of guy cable length, two strands of this right angled triangle mechanism, are made up of the drag-line of local.
Above-mentioned moment pillar 102, fixed arm 104, lever arm 106, length is equal, is equal to the radius R of right angle △ ABC circumscribed circle, it it is the narration of an outline, because the radius length of pulley gear is relatively small, for the ease of the reason illustrated, simplify the radius length that have ignored each pulley gear.
Described lever arm 106 is that rigidity is combined with counter-jib 1, and with horizontal rotating shaft X for rotating shaft, lever arm 106 is with counter-jib 1 synchronous axial system；The relative position relation of lever arm 106 and counter-jib 1, for when counter-jib 1 is when horizontal level, right angle △ ABC is isosceles right triangle state.
Counter-jib support 2 and pedestal 3 in Fig. 2, have the function of relation between lever arm 106 and the centrifugal force of determining counter-jib 1 and the dynamic governor motion of guy cable length.The string limit of right angle △ ABC is that rigidity is combined with counter-jib support 2, and when counter-jib 1 is when horizontal level, the dynamic governor motion lever arm 106 of guy cable length is perpendicular to the string limit of right angle △ ABC, and right angle △ ABC is isosceles right triangle state.
Because moment is the product of the arm of force and the component being perpendicular to the arm of force, when the distance length of force application location point D to horizontal rotating shaft X is bigger, the tension force of the round metal wire spring S of cable-tension system 100 can be smaller.The optimum distance length of force application location point D to horizontal rotating shaft X, is the problem to solve of technical solution of the present invention.
Fig. 3 is the explanation figure optimizing force application location point, the distance length of force application location point D to horizontal rotating shaft X is KR, when counter-jib 1 is horizontally situated XH, being positioned at the guy cable length outside the right angle △ dynamic governor motion of ABC guy cable length is AD, after counter-jib 1 rotates θ angle vertically downward, being positioned at the guy cable length outside the right angle △ dynamic governor motion of ABC guy cable length is:
L=√ (R+KRsin θ) ^2+ (KRcos θ) ^2=√ (R^2+K^2 × R^2 × (sin θ) ^2+2K × R^2 × sin θ+K^2 × R^2 × (cos θ) ^2=√ ((R^2+K^2 × R^2)+2K × R^2 × sin θ)
When θ=0, L (0)=√ (R^2+K^2 × R^2)；
When θ=pi/2, L (pi/2)=√ (R+KR) ^2=R+KR
When θ is turned to θ=pi/2 by θ=0, it is positioned at right angle △ ABC guy cable length and dynamically regulates
Guy cable length outside mechanism, adds: Δ L=(R+KR)-√ (R^2+K^2 × R^2)
Meanwhile, after counter-jib 1 rotates θ angle vertically downward, the ∠ A of right angle △ ABC adds θ/2, according to formula 1, the guy cable length of the dynamic governor motion of guy cable length two strands and be: a+b=2 √ 2R × sin ((A+ θ/2)+π/4))
When θ=0, ∠ A=π/4, a+b=2 √ 2R；
When θ=pi/2, a+b=2R；
When θ is turned to θ=pi/2 by θ=0, the guy cable length of the dynamic governor motion of guy cable length two strands of right angle △ ABC decreases: 2 √ 2R-2R.
If located in the length that the guy cable length outside the right angle △ dynamic governor motion of ABC guy cable length increases, equal with the length that the guy cable length of the dynamic governor motion of guy cable length two strands of right angle △ ABC reduces, then the length that round metal wire spring S is stretched will not increase.
That is during (R+KR)-√ (R^2+K^2 × R^2)=2 √ 2R-2R, the length that round metal wire spring S is stretched will not increase.
Solve above formula, obtain K=2.4.
Summary, as the cable-tension system 100 distance length XD to the force application location point D to horizontal rotating shaft X of counter-jib 1, during equal to 2.4 times of guy cable length dynamic governor motion right angle △ ABC circumradius, then when counter-jib 1 leaves horizontal level, when being swung down to vertical, that is when θ is swung down to θ=pi/2 by θ=0, the length that round metal wire spring S is stretched will not increase.Turned in the rotation process of θ=pi/2 by θ=0 at θ, the guy cable length of the dynamic governor motion of guy cable length two strands of right angle △ ABC is to tend to shorten, the trend that the guy cable length outside the right angle △ dynamic governor motion of ABC guy cable length increases can be offset, this effect, the moment variations relation that counter-jib is produced with centrifugal force by the tension force of conventional balanced arm passive type cable-tension system can be corrected, present the shortcoming run in the opposite direction.
Fig. 4 is one embodiment of the invention schematic diagram.Illustrating before embodiment schematic diagram, it should first differentiate the interval that the ∠ A of the dynamic governor motion right angle △ ABC of guy cable length is by 0 to π/4, the change situation of cable-tension system.
Looking back at Fig. 3 again, as ∠ A=0, counter-jib 1 should be positioned at position vertically upward and overlap with XU, and therefore, the guy cable length outside the right angle △ dynamic governor motion of ABC guy cable length is: KR-R；
When ∠ A=π/4, counter-jib 1 is horizontally situated XH, and the guy cable length outside the right angle △ dynamic governor motion of ABC guy cable length is: √ (R^2+K^2 × R^2)；
When ∠ A is by 0 → π/4, the guy cable length outside the right angle △ dynamic governor motion of ABC guy cable length adds (√ (R^2+K^2 × R^2))-(KR-R),
∵ K=2.4
∴ (√ (R^2+K^2 × R^2))-(KR-R)=1.2R；
Meanwhile, the guy cable length within the dynamic governor motion of right angle △ ABC guy cable length adds 2 √ 2R-2R=0.8R.Interval at this, when ∠ A is by 0 → π/4, the guy cable length that the right angle △ dynamic governor motion of ABC guy cable length is inside and outside, being all the trend presenting increase, cable-tension overall length of system altogether adds 1.2R and adds 0.8R equal to 2R, namely when ∠ A is by 0 → π/4, round metal wire spring S has been stretched the length of 2R, compared with conventional balanced arm passive type cable-tension system, interval at this, the length that round metal wire spring S is stretched is long.
First and last, the right angle △ dynamic governor motion of ABC guy cable length can be regarded a drag-line as and prestore mechanism, when ∠ A is by 0 → π/4, drag-line is accelerated to store away in advance, when ∠ A is by π/4 → pi/2 time, then discharge.
According to above-mentioned parsing, when the rotation space of counter-jib 1 includes ∠ A by 0 → π/4 interval, the design of round metal wire spring S, it is necessary to consider that round metal wire spring S is by the situation of the 2R that is stretched.
Therefore, in Fig. 4, the cable-tension system distance length to the force application location full horizontal rotating shaft X of some D of counter-jib 1, equal to guy cable length dynamic governor motion right angle △ ABC circumradius R 2.4 times, when the rotation space of counter-jib 1 includes ∠ A by 0 → π/4 interval, round metal wire spring S needs relatively larger deformation space, is therefore provided with long rack rod 20 in Fig. 4, replace the counter-jib support 2 in Fig. 2, to provide relatively larger deformation space to round metal wire spring S.Described rack rod 20 is the cylinder of a hollow, and round metal wire spring S is arranged at the cylindrical inside of rack rod 20, and the bottom of rack rod 20 is fixed in one end of round metal wire spring S, and the other end of round metal wire spring S is connected with drag-line T.The bottom of rack rod 20 has fixation means 22 and the vertical rod vertical rotation axis 21 of round metal wire spring S, vertical rod vertical rotation axis 21 and pedestal to be rotate to combine, and vertical rod vertical rotation axis 21 can horizontally rotate in pedestal.
According to aforesaid explanation, when counter-jib 1 leaves horizontal level, when lifting vertically upward, cable-tension system exerting a force with the height lifted decrescence to counter-jib 1；When counter-jib 1 leaves horizontal level, rotate vertically downward, when the angle, θ rotated vertically downward is equal to pi/2, that is time vertically downward, because cable-tension overall length of system is constant, the cable-tension system force to counter-jib 1, substantially maintains the counter-jib 1 force when horizontal level, but in rotation process, component owing to being perpendicular to counter-jib 1 successively decreases, therefore moment is successively decreased, and this meets counter-jib 1 and leaves horizontal level, and centrifugal force moment is also the trend successively decreased.The moment variations relation that counter-jib is produced by the tension force of conventional balanced arm passive type cable-tension system with centrifugal force, the shortcoming run in the opposite direction are corrected.
Fig. 5 is an application examples explanation figure of the present invention, compare with Fig. 4, rack rod 20 is replaced by expansion link 30, expansion link 30 includes the fixing bar 31 being fixed on pedestal 3 and a motion bar 32, fixing bar 31 is a hollow cylindrical vertical rod, and motion bar 32 can stretch in fixing bar 31 or rotate, and motion bar 32 is a hollow cylindrical rod, there is the function similar with the rack rod 20 in Fig. 4, it is provided that relatively larger deformation space is to round metal wire spring S.Motion bar 32 is internally provided with one end of round metal wire spring S, round metal wire spring S and is fixed on the bottom of motion bar 32, and the other end of round metal wire spring S is connected with drag-line T.Expansion link 30 also has locking device 33, after unclamping locking device 33, can lift or rotate motion bar 32 to appropriate location, then locking again.
In Fig. 5, counter-jib 1 includes plane parallel four-bar device 11 and an adjutage 111, the base shaft XE of plane parallel four-bar device 11 is a part for the dynamic governor motion fixed arm 104 of guy cable length, connecting rod XG that is adjacent with base shaft XE and that be connected with horizontal rotating shaft X is driving lever, drag-line T forces in the force application location point D on driving lever, the distance length XD of force application location point D to horizontal rotating shaft X, equal to 2.4 times of guy cable length dynamic governor motion right angle △ ABC circumradius R.
On the connecting rod FG of plane parallel four-bar device 11, being provided with the rotating shaft mechanism Y being combined with adjutage 111, rotating shaft mechanism Y and have a vertical rotation axis, adjutage 111 can utilize the vertical rotation axis of rotating shaft mechanism Y to do to horizontally rotate, the far-end of adjutage 111, is provided with the facility such as lampshade and lamp holder.
Above-mentioned plane parallel four-bar device is common mechanism, is therefore not detailed.
Additionally, the length of the circumradius R of the right angle △ ABC addressed in above, closely related with overall structure, the load of its length and support arm and the spring force size of round metal wire spring S are all relevant, overall attractive in appearance be also important Consideration.It is said that in general, the length of the circumradius R of selected right angle △ ABC, it it is a select permeability during practical application.
When carrying out Fig. 4 embodiment and illustrating, discuss the ∠ A of the dynamic governor motion right angle △ ABC of guy cable length by 0 to the interval of π/4, the length change situation of cable-tension system.Due in this interval, the length of cable-tension system changes greatly, and the change of the length of this cable-tension system is provided by round metal wire spring S, causes the rack rod 20 in Fig. 4 embodiment, must possess a basic length, could rationally realize the deformation needs of round metal wire spring S.Therefore for leaving horizontal level, lifting vertically upward, to adjust the counter-jib lamp of position, long rack rod 20 is necessary.
But, counter-jib lamp in many cases, is not required to lift vertically upward to adjust position, for instance, it is installed in the counter-jib lamp of the higher position of wall surface, it is not necessary to adjust upward position again.For being raised vertically upward by horizontal level, to adjust the counter-jib lamp of position, it is possible to ignore the interval that the above-mentioned ∠ A for the dynamic governor motion right angle △ ABC of guy cable length is by 0 to π/4, about the discussion of the change situation of cable-tension system.Have only to be absorbed in Fig. 3, when θ is swung down to the interval of θ=pi/2 by θ=0, that is have only to the ∠ A paying close attention to the dynamic governor motion right angle △ ABC of guy cable length by the interval of π/4 to pi/2.
Parsing according to Fig. 3, as the cable-tension system distance length XD to the force application location point D to horizontal rotating shaft X of counter-jib 1, equal to guy cable length dynamic governor motion right angle △ ABC circumradius 2.4 times, then when counter-jib 1 leaves horizontal level, when being swung down to upright position, that is when θ is turned to θ=pi/2 by θ=0, the length that round metal wire spring S is stretched will not increase.This represents, as long as round metal wire spring S possesses enough tension force, it is not necessary to the problem considering round metal wire spring S deformation space, namely during design round metal wire spring S, it is not necessary to arrange bigger deformation space, it is possible to be designed to shorter shape.
Again, above-mentioned horizontal rotating shaft X, it is provided with the facility that can adjust frictional force, is that this technical field known to the skilled person which, therefore not shown in the figures.
According to the above discussion, Fig. 6 is the present invention another application examples explanation figure.In Fig. 6, the rotating mechanism of counter-jib 1 has a block body mechanism K, makes counter-jib 1 only up to be raised to level height, and counter-jib 1 can only rotate vertically downward from horizontal level, it is impossible to upwards raises.The cable-tension system distance length XD to the force application location point D to horizontal rotating shaft X of counter-jib 1, equal to guy cable length dynamic governor motion right angle △ ABC circumradius 2.4 times, round metal wire spring S is swung down in the interval of θ=pi/2 in θ=0, actually will not be elongated, therefore, during design round metal wire spring S, with little need for considering deformation space.
Counter-jib lamp shown in Fig. 6, substantially identical with Fig. 4, cylindrical stent 40 instead of counter-jib support 2, cylindrical stent 40 and pedestal 3 are integrative-structures, pedestal 3 is fixed on vertical metope, round metal wire spring S has cylindrical jacket 41, and the bottom of cylindrical jacket 41 is fixed in one end of round metal wire spring S, and the other end of round metal wire spring S links with drag-line T；Cylindrical stent 40 has a vertical hollow cavity, the cylindrical jacket 41 of round metal wire spring S can be made to horizontally rotate in the vertical hollow cavity of cylindrical stent 40, cylindrical stent 40 and pedestal 3 are integrative-structures, pedestal 3 is fixed on vertical metope, the vertical hollow cavity making cylindrical stent 40 can keep vertical, to guarantee that counter-jib 1 is when horizontal level, the string limit of right angle △ ABC is perpendicular to the lever arm 106 of the dynamic governor motion of guy cable length, and right angle △ ABC is isosceles right triangle state.
Summary explanation, the principal character of technical solution of the present invention, including: based on the passive type cable-tension system of right angle △ ABC two strands He the construction of a+b=2 √ 2R.sin (A+ π/4) functional expression institute, the described cable-tension system distance length XD to the force application location point D to the horizontal rotating shaft X of counter-jib 1 of counter-jib 1, equal to 2.4 times of guy cable length dynamic governor motion right angle △ ABC circumradius.When utilizing the arm of counter-jib lamp of above-mentioned technical characteristic lower than in the vertical space of elevation of water, when rotating vertically downward, the tension force of the cable-tension system that arm is subject to, will not as tradition passive type counter-jib lamp, present metal spring to be stretched on the contrary, the phenomenon run in the opposite direction that tension force increases on the contrary；The force application location point of counter-jib 1 to the distance length of horizontal rotating shaft, equal to 2.4 times of guy cable length dynamic governor motion right angle △ ABC circumradius, then can be played maximum trimming moment effect by cable-tension system.
During practical application, the angle that moves both vertically of arm, exceed horizontal level if can be raised to, then round metal wire spring S needs relatively larger deformation space, if arm can only be raised to level height, then round metal wire spring S is completely without increasing deformation space.So different changing features can be produced, be because the right angle △ dynamic governor motion of ABC guy cable length and can regard a drag-line as and prestore mechanism, when ∠ A is by 0 → π/4, drag-line is accelerated to store away in advance, when ∠ A is by π/4 → pi/2 time, then the reason discharged.
The present invention is to the passive type cable-tension system based on right angle △ ABC two strands and the construction of a+b=2 √ 2R.sin (A+ π/4) functional expression institute, point of application position to counter-jib lamp counter-jib, what carry out distributes rationally, makes the present invention can play greatest benefit based on the cable-tension system of the law of sines.
Claims (3)
1. a counter-jib lamp, it is characterized in that, at least include a counter-jib (1), a cable-tension system (100), a counter-jib support (2), a pedestal (3), described cable-tension system (100) includes a drag-line (T), a round metal wire spring (S), the dynamic governor motion of a guy cable length (101), the dynamic governor motion of described guy cable length (101), including: a moment pillar (102), a fixed arm (104), a lever arm (106), a horizontal rotating shaft (X)；Described moment pillar (102), fixed arm (104), lever arm (106) length are equal, with horizontal rotating shaft (X) for axle center, it is radially arranged, its position, end end, is respectively provided with moment pillar pulley (103), fixed arm pulley (105), lever arm pulley (107)；
Described moment pillar (102) and fixed arm (104), centered by horizontal rotating shaft (X), moment pillar is positioned at the top of horizontal rotating shaft, moment pillar (102) and fixed arm (104) are in a symmetrical line rigid structure, described moment pillar (102) and fixed arm (104) straight line rigid structure, be perpendicularly fixed on described counter-jib support (2)；
Described round metal wire spring (S) is a tension spring, first end of round metal wire spring (S) is fixed on counter-jib support (2), second end of round metal wire spring (S) is connected with the first end of drag-line (T), second end of drag-line (T) is by, after the dynamic governor motion of guy cable length (101), forcing in force application location point (D) of counter-jib (1)；
When second end of drag-line (T) is by guy cable length dynamic governor motion (101), sequentially straddled fixed arm pulley (105), lever arm pulley (107) and moment pillar pulley (103), drag-line between fixed arm pulley and lever arm pulley, drag-line between lever arm pulley and moment pillar pulley, and described moment pillar (102) and fixed arm (104) straight line rigid structure, collectively form the dynamic governor motion of the guy cable length (101) of rectangular triangle, described moment pillar (102) and fixed arm (104) straight line rigid structure, constitute the string limit of guy cable length dynamic governor motion (101) right angled triangle of described rectangular triangle；Drag-line (T) between fixed arm pulley and lever arm pulley, the drag-line (T) between lever arm pulley and moment pillar pulley, respectively constitute two strands of the dynamic governor motion of guy cable length (101) of described rectangular triangle；
Described horizontal rotating shaft (X) is vertical with the plane of the right angled triangle of the dynamic governor motion of the guy cable length (101) of described rectangular triangle, described lever arm (106) and described counter-jib (1) are rigid structures, with described horizontal rotating shaft for axle center synchronous axial system, the relativeness of lever arm and counter-jib is when counter-jib (1) is when horizontal level, and the guy cable length between fixed arm pulley and lever arm pulley, the guy cable length between lever arm pulley and moment pillar pulley are isometric；The described cable-tension system (100) distance to force application location point (D) of counter-jib (1) with the horizontal rotating shaft (X) of counter-jib, for 2.4 times of described moment pillar (102) length.
2. counter-jib lamp according to claim 1, it is characterized in that, described counter-jib support (2) includes a rack rod (20) and a vertical rod vertical rotation axis (21), rack rod (20) is a hollow circular cylinder, round metal wire spring (S) is arranged in rack rod (20), fixation means (22) and the vertical rod vertical rotation axis (21) of round metal wire spring (S) is arranged at the bottom of rack rod (20), vertical rod vertical rotation axis (21) and pedestal (3) are to rotate to combine, vertical rod vertical rotation axis (21) can horizontally rotate in pedestal (3).
3. counter-jib lamp according to claim 1, it is characterized in that, described counter-jib support (2) is an expansion link (30), it includes the fixing bar (31) being fixed on pedestal (3) and a motion bar (32), fixing bar (31) is a hollow cylindrical vertical rod, motion bar (32) can stretch in fixing bar (31) or rotate, motion bar (32) is a hollow circular cylinder, motion bar (32) is internally provided with round metal wire spring (S), the bottom of motion bar (32) is fixed in one end of round metal wire spring (S), the other end of round metal wire spring (S) is connected with drag-line (T), expansion link (30) also has locking device (33), motion bar (32) can lift after turning to appropriate location and be locked.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310233294.8A CN104235666B (en) | 2013-06-13 | 2013-06-13 | Counter-jib lamp |
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| CN201310233294.8A CN104235666B (en) | 2013-06-13 | 2013-06-13 | Counter-jib lamp |
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| CN104235666B true CN104235666B (en) | 2016-07-13 |
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| CN201310233294.8A Expired - Fee Related CN104235666B (en) | 2013-06-13 | 2013-06-13 | Counter-jib lamp |
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| CN106918024A (en) * | 2017-04-06 | 2017-07-04 | 南昌叁润科技有限公司 | A kind of Novel LED light of multi-angle irradiation |
| CN107917397B (en) * | 2017-11-27 | 2019-04-30 | 中国矿业大学 | Sine and cosine curve physical motion lamps and lanterns |
| CN110262572A (en) * | 2019-07-23 | 2019-09-20 | 上海摩昆新能源科技有限公司 | Photovoltaic tracking bracket and eccentricity compensation device |
| CN111174150B (en) * | 2019-09-03 | 2022-10-28 | 深圳市海洋王铁路照明技术有限公司 | Lighting device |
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| US4770384A (en) * | 1986-07-28 | 1988-09-13 | Matsushita Electric Works, Ltd. | Movable stand |
| IT1217683B (en) * | 1988-05-20 | 1990-03-30 | Artemide Spa | ARTIFICIAL LIGHTING EQUIPMENT WITH ARTICULATED ARMS |
| US6814473B2 (en) * | 2002-12-03 | 2004-11-09 | Gingko Industrial Co., Ltd. | Lamp with hinged adjustable arm structure |
| US6896230B2 (en) * | 2002-12-30 | 2005-05-24 | Sava Cvek | Equipoise arm assembly |
| JP2010178940A (en) * | 2009-02-06 | 2010-08-19 | Yoshiro Takiguchi | Bookrest |
| CN202109295U (en) * | 2011-05-13 | 2012-01-11 | 上虞力得电器有限公司 | Crane-neck lamp |
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