CN101634803B - Projection screen device - Google Patents

Abstract

The embodiment of the invention discloses a projection screen device, which comprises a projection curtain screen and a self-locking mechanism, wherein the self-locking mechanism comprises a self-locking shaft, a self-locking core and at least one ball; the self-locking core is arranged on the self-locking shaft and is provided with at least one group of inner ball rail; the inner ball rail is provided with a plurality of grooves to form a first communicating path and a second communicating path which are communicated; a self-locking point and an inflection point are arranged on the second communicating path and have a first pull-down length therebetween; and the inflection point and the path end adjacent to the inflection point on the second communicating path have a first roll-up length therebetween. The first pull-down length of the projection curtain screen is more than or equal to the first roll-up length, so that the ball can roll from the self-locking point to the inflection point, and then roll from the inflection point to an tail end capable of separating from the second communicating path to release self-locking.

Description

Projection curtain device

[technical field]

The invention relates to a kind of projection curtain device, particularly relevant for a kind of projection curtain device with self-locking mechanism.

[background technology]

At present, projection screen has been widely used in family, school and commercial field, for example: numerous use occasions such as home theater, multimedia teaching, command centre, video conference rooms.

Please refer to shown in Figure 1ly, a kind of existing detent mechanism 9 that pulls projection curtain device includes: self-locking shaft 90, form from lock core 91, self-locking overcoat 92 and two switch springs 93,95.Be sheathed on the self-locking shaft 90 from lock core 91, on the external cylindrical surface of lock core 91, offer ball grooves 94; Self-locking overcoat 92 is sheathed on lock core 91, offers a straight trough 920 vertically on the inwall of self-locking overcoat 92, and at least one ball 96 is arranged between the straight trough 920 of the ball grooves 94 of lock core 91 and self-locking overcoat 92 inwalls.Two switch springs 93,95 are placed on the two ends of self-locking shaft 90 respectively, and each switch spring 93,95 all has an end to be fixed on lock core 91 by screw.

Above-mentioned existing ball grooves 94 from lock core 91 has an oblique line groove 940, one first curved slot 941, one second curved slot 942, a latching point 943, a flex point 944, one the 3rd curved slot 945 of connection, and one the 4th curved slot 946, its bend groove 940 is to become skewed with respect to the axis from lock core 91; First curved slot 941 and the 4th curved slot 946 are around the outer surface setting from lock core 91; Second curved slot 942 and the 3rd curved slot 945 are to become skewed with respect to the axis from lock core 91; Latching point 943 is to be connected second, third curved slot 942,945 with flex point 944.

When drop-down projection screen, the self-locking overcoat 92 of above-mentioned existing detent mechanism 9 is rotated in a clockwise direction, straight trough 920 on this moment self-locking overcoat 92 can drive balls 96 and slip in first curved slot 941 through oblique line grooves 940 from the 4th curved slot 946, and in first curved slot 941 around the movement.When desiring positioning projection's curtain, the operator can stop drop-down at any time, self-locking overcoat 92 reverse rotations (promptly being rotated counterclockwise) certain angle, straight trough 920 on it can drive balls 96 and slip into second curved slot 942, slides to latching point 943 again then from first curved slot 941, this moment, ball 96 was stuck at latching point 943 places, and make that self-locking overcoat 92 can not turning anticlockwise, finish the lock-bit of projection screen in this way.When the needs release, only need drop-down projection screen to make self-locking overcoat 92 turn an angle along clockwise direction, the straight trough 920 of self-locking this moment overcoat 92 can drive ball 96 and skid off (or deviating from) latching point 943, arrive flex point 944, being blocked by flex point 944 can't be drop-down, can allow projection screen reclaim this moment again, the straight trough 920 of self-locking this moment overcoat 92 can drive ball 96 and slip over the 3rd curved groove 945, and then discharge projection screen fully, make self-locking overcoat 92 rotate counterclockwise, ball 96 will slip into the 4th curved slot 946 from the 3rd curved slot 945, and in the 4th curved slot 946 shuttling movement, regain fully until projection screen.

Although above-mentioned existing detent mechanism 9 can arbitrarily be located projection screen at any place, each curved groove machining precision is difficult for holding, and is easy to take place to separate the situation of self-locking.Even if machining precision reaches requirement, but when projection screen only by drop-down once being positioned than short distance (it is defined as first pulldown length), and when desire reclaims afterwards, in separating the process of self-locking, also need the drop-down another distance of projection screen (it is defined as second pulldown length), this second pulldown length equals ball 96 slides to flex point 944 from latching point 943 course length, break away from latching point 943 and slide to flex point 944 so that the straight trough of self-locking overcoat 92 920 drives ball 96, this moment, ball 96 was very easily stuck can't skid off the 3rd curved slot 945 in flex point 944 places.In detail, because first pulldown length of projection screen is very short, the recovery length that is to say projection screen is very short, when the summation after first pulldown length and the second pulldown length addition during less than the length of run (being the course length of ball 96 in the 3rd curved slot 945) of the 3rd curved slot 945, in removal process, cause does not have enough distances can make ball 96 skid off the 3rd curved slot 945, thereby ball 96 can't enter in the 4th curved slot 946.In specific operation process, if meet stuck phenomenon, the operator can exert oneself drop-down projection screen attempting release usually, but the strength that strengthens very easily destroys ball grooves 94 or destroy existing other member that pulls projection curtain device, and release is not then had any effect.

Therefore, be necessary to provide a kind of new projection curtain device, to overcome the defective that exists in the prior art.

[summary of the invention]

Fundamental purpose of the present invention is to provide a kind of projection curtain device, and it is provided with self-locking mechanism, can realize the function of safe self-locking and release, and then improves the quality of projection curtain device.

Other purpose of the present invention and advantage can be further understood from the disclosed technical characterictic of the present invention.

For reaching above-mentioned purpose or other purpose, the present invention adopts following technical scheme: a kind of projection curtain device includes: a projection screen and a self-locking mechanism.Self-locking mechanism is in order to locate this projection screen, and self-locking mechanism includes: a self-locking shaft, is from lock core and at least one ball.Be installed on the self-locking shaft from lock core, have at least one group of interior ball orbit.Interior ball orbit has several grooves, and these grooves are formed with one first communication path and one second communication path that connects, and wherein a latching point and a flex point are to be positioned on second communication path.Have one first pulldown length between latching point and flex point, adjacent on the flex point and second communication path is bordering on to have one first between the Trail termination of flex point and reclaims length.Ball can move on the interior ball orbit of lock core, wherein when projection screen is in a self-locking position, drop-down projection screen, ball can move to flex point from latching point, and when ball is positioned at flex point, reclaim projection screen, ball can move to the Trail termination of second communication path from this flex point.First pulldown length is to reclaim length more than or equal to first, makes ball when latching point moves to flex point, and ball can shift out second communication path from flex point, and is stuck in the flex point place to avoid ball.

According to another embodiment of the present invention, between first communication path and second communication path, has an orbit sidewall.One latching point and a flex point are arranged in the interior ball orbit and are positioned on second communication path, in having one first pulldown length on second communication path between latching point and the flex point; Between Trail termination flex point to the second communication path and adjoining flex point, be formed with one first and reclaim length.When projection screen is in self-locking position, drop-down projection screen, ball can move to flex point from latching point, and when ball is positioned at flex point, reclaims projection screen, and ball can move to the Trail termination of second communication path from flex point.First to reclaim length be more than or equal to first pulldown length, when ball when latching point moves to flex point, can enter in first communication path, stuck to avoid ball in the flex point place.

Compared to prior art, first pulldown length in the projection curtain device of one embodiment of the invention is to reclaim length more than or equal to first, make ball skid off flex point with regard to having enough distances like this from latching point, and can skid off second communication path smoothly from flex point, and avoid occurring stuck phenomenon.The orbit sidewall of the projection curtain device of another embodiment is provided with a fluting, directly is communicated with the flex point and first communication path.First to reclaim length be to slide to first pulldown length of flex point greater than ball from latching point, and when release, ball can slide to flex point from latching point, and then directly enters in first communication path via fluting, to avoid stuck in the flex point place.Projection curtain device In yet another embodiment has the first bigger switch spring of an internal diameter, can optionally prevent and rotate along clockwise direction with respect to self-locking shaft from lock core, so though the first recovery length is also greater than first pulldown length, but after ball arrives flex point because first switch spring has bigger internal diameter can shrink and make the curtain can a drop-down again segment distance, such first pulldown length adds that the deformation because of switch spring causes the drop-down segment distance of curtain just to guarantee that first pulldown length reclaims length greater than first, ball can slide to flex point from latching point like this, and can skid off second communication path smoothly from flex point, to avoid stuck in the flex point place.

[description of drawings]

Fig. 1 is the existing detent mechanism synoptic diagram that pulls projection curtain device.

Fig. 2 is the integral outer structural representation of the projection curtain device of one embodiment of the invention.

Fig. 3 disassembles inner structure synoptic diagram afterwards with the shell shown in Fig. 3, first end cap and second end cap.

Fig. 4 is the decomposition texture synoptic diagram of the projection curtain device of one embodiment of the invention.

Fig. 5 is the jack synoptic diagram of the one embodiment of the invention shown in Fig. 4.

Fig. 6 A is the actuating unit unitized construction synoptic diagram of the one embodiment of the invention shown in Fig. 4.

Fig. 6 B is the actuating unit decomposition texture synoptic diagram of the one embodiment of the invention shown in Fig. 4.

Fig. 7 is the actuating unit of one embodiment of the invention and the decomposing schematic representation of self-locking mechanism.

Fig. 8 is the actuating unit of one embodiment of the invention and the assembling synoptic diagram of self-locking mechanism, and demonstrates the assembled relation of the self-locking structure and first end cap among the figure.

Fig. 9 is the integral outer structural representation of the self-locking mechanism of one embodiment of the invention.

Figure 10 A and Figure 10 B are the decomposition texture synoptic diagram of the self-locking mechanism of one embodiment of the invention.

Figure 11 is the self-locking mechanism synoptic diagram of second embodiment of the invention.

[embodiment]

The explanation of following each embodiment is graphic with reference to what add, can be in order to the specific embodiment of implementing in order to illustration the present invention.The direction term that the present invention mentioned, for example " on ", D score, " preceding ", " back ", " left side ", " right side " etc., only be direction with reference to annexed drawings.Therefore, the direction term of being mentioned in following examples of the present invention is to be used for illustrating the present invention, but not is used for limiting the present invention.

Please refer to the projection curtain device 100 of Fig. 2 to one embodiment of the invention shown in Figure 4, the projection curtain device 100 in the present embodiment includes: a projection screen 1, a jack 2, an actuating unit 3, a self-locking mechanism 4, a shell 6, one first end cap 7 and one second end cap 8.Shell 6 maintains static and is elongated tubular structure; be used for accommodating and protect jack 2, actuating unit 3 and self-locking mechanism 4; projection screen 1 also can be recovered in the shell 6, or protrudes outwardly to required fixed position from shell 6, for image projecting on it.The two ends of shell 6 be sealed by first end cap 7, second end cap 8 close, in preventing that foreign object from going into, guarantee projection curtain device 100 can be in the working environment of a safety and stability operate as normal.

Please refer to Fig. 4 to shown in Figure 5, the jack 2 of projection curtain device 100 is to be connected with projection screen 1, and can be along first direction (as clockwise direction) rotation, so that projection screen 1 is protruding from shell 6; Or along the second direction opposite (as counter clockwise direction) rotation and recovery projection screen 1, so that projection screen 1 is recovered in the shell 6 with first direction.In the present embodiment, jack 2 comprises a tube 20, is oval column, in order to support whole projection screen 1.Tube 20 is to be contained in the shell 6, and can rotate in shell 6, for reclaiming or disengaging projection screen 1.Tube 20 length are less than shell 6 length.

Projection screen 1 is to be rectangle, have a top margin 10, a base 11 and the picture area 14 between top margin 10 and base 11, the top margin 10 of projection screen 1 is made into tubular, sheathed being connected on the tube 20, can be or have other in conjunction with the structure that is fixed on the tube 20, so that projection screen 1 can be wound in or be attached on the cylindrical outer surface of tube 20.The base 11 of projection screen 1 is fixedly connected on the pull bar 12, and pull bar 12 is to be positioned at shell 6 outsides, on the one hand is to make projection screen 1 launch the back by himself weight to keep smooth, can stop the base 11 of projection screen 1 to enter shell 6 inside on the other hand.Middle position at pull bar 12 is provided with a draw ring 13, so that the operator pulls projection screen 1.

Please refer to shown in Fig. 4 to Fig. 6 B, actuating unit 3 is to be connected with jack 2, reclaims power to jack 2 in order to provide one.In the present embodiment, actuating unit 3 is installed on tube 20 inside, includes: a torque spring 30, a back shaft 31 and a connecting seat 32.Torque spring 30 has first pin 301 and second pin 302.Back shaft 31 is tubulose major axis, can be by the hard tube manufacture of aluminum pipe or any suitable material, have first support tip 311 and second support tip 312.On back shaft 31, be formed with a through hole 313 near first support tip, 311 places, penetrate the outer tubular wall (indicating) of back shaft 31 and be connected with its inner axis hole (not shown).Connection Block 32 is to be cylindric, and it is placed on second support tip 312 of back shaft 31 rotationally, so Connection Block 32 can rotate with respect to back shaft 31.The cylindric outer surface of Connection Block 32 is provided with the fin 321 that a groove 320 and is positioned at groove 320, and a cylinder end face of Connection Block 32 is provided with a groove 322.First pin 301 of torque spring 30 penetrates the through hole 313 on the back shaft 31 and is fixed on the back shaft 31,302 of second pins of torque spring 30 are socketed on the fin 321 of Connection Block 32 and are placed in the groove 320, so torque spring 30 is arranged between Connection Block 32 and the back shaft 31.

Actuating unit 3 is to be connected with tube 20 by Connection Block 32 to link together with jack 2.In detail, one pin (not shown) penetrates the screw hole 21 (Fig. 5) on the tube 20, be inserted into again in the groove 322 on the Connection Block 32, so that Connection Block 32 is pinned at tube 20, therefore Connection Block 32 can rotate with tube 20, in this way actuating unit 3 and jack 2 is combined.When projection screen 1 drop-down or overhanging release, tube 20 can rotate along first direction (as clockwise direction), because Connection Block 32 and tube 20 pin joints are together, so Connection Block 32 also can be along with tube 20 is done the clockwise direction rotation.At this moment, second pin 302 of torque spring 30 can be along with Connection Block 32 rotates together, and 301 of first pins are fixed on the back shaft 31, so torque spring 30 can deform, accumulates the elastic force potential energy and has recovery power.When discharging projection screen 1, under the effect of the restoring force that the recovery power of torque spring 30 is produced, Connection Block 32 can rotate along counter clockwise direction, and tube 20 also can be connected seat 32 drives and rotation counterclockwise, therefore projection screen 1 is retracted in the shell 6.

In the present embodiment, torque spring 30 is made of volute spring, be sheathed on the back shaft 31, therefore see through the number of active coils of setting torque spring 30, can adjust torque spring 30 and understand the size that the recovery power that produces reaches the restoring force that is produced by this recovery power.

Please refer to shown in Fig. 4, Fig. 7 to Figure 10 B, self-locking mechanism 4 is to be connected with jack 2, in order to projection screen 1 is positioned on any selected position.Self-locking mechanism 4 and is close to first end cap, 7 places in jack 2 is arranged at tube 20.Self-locking mechanism 4 includes: a self-locking shaft 40, is from lock core 41, a self-locking overcoat 42, and two balls 43 (only demonstrating a ball among the figure), wherein self-locking shaft 40, make by the wear-resistant plastic material from lock core 41 and self-locking overcoat 42.Self-locking mechanism 4 and jack 2 are to be connected with tube 20 and to link together by self-locking overcoat 42, and it is described that self-locking overcoat 42 and the detailed connected mode of tube 20 are held the back.

Self-locking shaft 40 has first terminal 401 and second end 402, first end 401 of self-locking shaft 40 is to be the polygon column structure, the four prisms cylinder structure shown in Fig. 8 for example, be inserted in the post hole 71 (quadrangular hole as shown in Figure 8) of the set complementary shape in first end cap, 7 inside, and be fixedly connected on first end cap 7, therefore in the use of projection curtain device 100, promptly in the release and removal process of projection screen 1, self-locking shaft 40 remains the fixed static state.Second end 402 of self-locking shaft 40 is to be cylindric, fixedly connected with first support tip 311 of the back shaft 31 of actuating unit 3, so back shaft 31 also is to remain the fixed static state.In the present embodiment, in the inside axis hole of first support tip 311 of the second terminal 402 insertion back shafts 31 of self-locking shaft 40, and penetrate through hole 313 on the back shaft 31 and the pin hole 403 on the self-locking shaft 40 by first pin 301 of torque spring 30, the two is fixedly connected on together.In the present embodiment, the two is to combine for self-locking shaft 40 and back shaft 31, and is arranged at jointly in the tube 20, so the length summation of the two is not more than the length of tube 20.

Except first pin 301 that sees through torque spring 30 penetrates the locking nail hole 403 of the through hole 313 of back shaft 31 and self-locking shaft 40 simultaneously, also the pin hole (not shown) can be set in addition on back shaft 31, be aligned in the pin hole 403 on the self-locking shaft 40, and pass the pin hole of back shaft 31 and the pin hole 403 of self-locking shaft 40 successively, and together with the two pin joint with a pin (not shown).In other different embodiment, 31 of self-locking shaft 40 and back shafts also can adopt other connected mode, for example the cylindrical outer surface of second end 402 of self-locking shaft 40 can adopt interference engagement with the inside axis hole of first support tip 311 of back shaft 31, and with the two direct connection.Or the self-locking shaft of self-locking mechanism 4 40 directly is arranged to one with the back shaft 31 of actuating unit 3 and is become and enjoy axle altogether.

From lock core 41 are big rough cylindrical members, are placed on the self-locking shaft 40.Cylindric outer surface from lock core 41 is provided with ball orbit 44 at least one group, and interior ball orbit 44 has several groove structures, and these grooves are formed with one first communication path and one second communication path that connects.In the present embodiment, be provided with ball orbit 44 in three groups, be equipped with a latching point on the ball orbit 44 in each group from the outer surface of lock core 41.In the present embodiment, ball orbit 44 is to become 120 degree rotation symmetries with the axis from lock core 41 in three groups, and the structure of ball orbit 44 is all identical in three groups, therefore only demonstrate wherein one group of interior ball orbit 44 in graphic, to be that example elaborates to its structure hereinafter, and just no longer specifically describe for ball orbit in other with ball orbit 44 in this group.

Shown in Figure 10 A, some grooves of interior ball orbit 44 have an oblique line groove 440 of connection, one first curved slot 441, one second curved slot 442, one first detent 443, one second detent 446, one the 3rd curved slot 444 and one the 4th curved slot 445, wherein first curved slot 441 and the 4th curved slot 445 are around the outer surface setting from lock core 41, oblique line groove 440 then is communicated between first curved slot 441 and the 4th curved slot 445 to become skewed with respect to the axis from lock core 41, constitutes first communication path of 445 of first curved slot 441 and the 4th curved slots.Latching point in first detent 443 constitutes on the ball orbit 44, flex point in second detent 446 constitutes on the ball orbit 44, and flex point is between first detent 443 and the 3rd curved slot 444, and first detent 443, second detent 446 is to be arranged between first curved slot 441 and the 4th curved slot 445, and see through second curved slot 442 and the 3rd curved slot 443 is connected to respectively on first curved slot 441 and the 4th curved slot 445, and constitute second communication path that is communicated between first curved slot 441 and the 4th curved slot 445.Have an outstanding guidance part 4410 on first curved slot 441, ball 43 is directed in second communication path by first curved slot 441 when rotating in the counterclockwise direction.It is to betide from clockwise direction to rotate the action of circling round that then is positioned again when stopping operating that herein counter clockwise direction is rotated, and please be detailed later.Also have an outstanding guidance part 4450 on the 4th curved slot 445, ball 43 is directed in first communication path (oblique line groove 440) by the 4th curved slot 445 when rotating in the clockwise direction.It is to betide by the location halted state to change into when counter clockwise direction is rotated that clockwise direction is herein rotated, need drop-down projection screen 1 earlier, and making tube 20 and self-locking overcoat 42 clockwise rotate certain angle together, this partly will further be illustrated hereinafter.

Furthermore, oblique line groove 440 constitutes above-mentioned first communication path, and second curved slot 442, first detent 443, second detent 446 and the 3rd curved slot 444 then constitute above-mentioned second communication path.Has an orbit sidewall 447 between first communication path and second communication path.Be positioned between latching point (i.e. first detent 443) on second communication path and the flex point (i.e. second detent 446) and have first pulldown length; Reclaim length from flex point to having first between the Trail termination 449 this second communication path and adjoining this flex point.In fact, first pulldown length is the length of run between first detent 443 and second detent 446, and the first recovery length is the length of run of the 3rd curved slot 444.In first embodiment, orbit sidewall 447 is provided with a fluting 448, in order to the direct connection flex point and first communication path, promptly directly is communicated with second detent 446 and oblique line groove 440.In releasing process, when the flex point stuck phenomenon occurring, ball 43 can directly enter first communication path through fluting 448.Relevant for the function mode of self-locking mechanism 4, hereinafter can further specify.

At the stroke on the interior ball orbit 44 of lock core 41, is to be nested with and to be fixed in self-locking shaft 40 on from lock core 41 for ease of control ball 43, and please be detailed later about the folding and unfolding relation of ball 43 strokes and projection screen 1 and the principle of work of self-locking mechanism 4.In the present embodiment, be to be fixed on the self-locking shaft 40 from lock core 41 by first switch spring 45, second switch spring 46.In detail, a switch spring 45 or 46 respectively are being installed, for example at first switch spring 45 that a levoform is installed from the left end face of lock core 41, at the second switch spring 46 that a dextrorotation formula is installed from its right end face of lock core 41 from the both sides of lock core 41.Do the time spent when be subjected to a clockwise driving force from lock core 41, wherein a switch spring (first switch spring 45 of levoform) can be prevented from lock core 41 and clockwise rotate, and do the time spent when being subjected to an anticlockwise driving force from lock core 41, another switch spring (the second switch spring 46 of dextrorotation formula) can be prevented from lock core 41 and rotate counterclockwise, and can be maintained fixed stationary state haply from lock core 41 in this way.

In other embodiments, also can be fixed in by alternate manner on the self-locking shaft 40 from lock core 41, perhaps in a further embodiment, also can be placed on the self-locking shaft 40 from lock core 41 in rotating mode, and still can realize its original function, just the stroke of ball 43 in interior ball orbit 44 can become complicated.

Self-locking overcoat 42 is to be placed on rotationally on the outer surface of lock core 41, have with from the relative cylindric inner surface of the outer surface of lock core 41, being provided with 420, three groups of outer ball orbits 420 of three groups of outer ball orbits corresponding to ball orbit 44 in three groups on it is that axis with self-locking overcoat 42 becomes 120 degree rotation symmetries.In the present embodiment, the outer ball orbit 420 of each group is made of a straight-line groove that extends along axis direction.Self-locking overcoat 42 has the terminal 421 and 1 second overcoat end 422 of one first overcoat, is provided with a screw hole 423 in the vicinity of the first overcoat end 421, between the cylindric outer surface and inner surface of self-locking overcoat 42.One pin (not shown) penetrates one and is located at the screw hole 22 on the tube 20 and the screw hole 423 of self-locking overcoat 42, self-locking overcoat 42 is fixed on the tube 20, therefore self-locking overcoat 42 is to rotate with tube 20, then is maintained fixed motionless haply from lock core 41.In other words, when tube 20 rotated, self-locking overcoat 42 can be with respect to rotating from lock core 41.

Ball 43 is arranged between lock core 41 and self-locking overcoat 42, and ball orbit 44 reaches in the outer ball orbit 420 in embedding and sliding on.Because in the present embodiment, on lock core 41, be symmetrically arranged with ball orbit 44 in three groups, and self-locking overcoat 42 is symmetrically arranged with three groups of corresponding outer ball orbits 420, therefore in fact, in every group of corresponding interior ball orbit 44 and the outer ball orbit 420 ball 43 can be set all, form the enforcement aspect that three balls 43 slide in corresponding interior ball orbit 44 and the outer ball orbit 420 simultaneously separately.Three balls 43 turn round simultaneously, in case arbitrary ball 43 goes wrong, for example stroke differs and is stuck, and can keep in repair with regard to dismantling whole projection curtain device 100.In other embodiments, also can adopt two balls 43 to turn round simultaneously in the self-locking mechanism 4, can guarantee that not only self-locking mechanism 4 can produce enough self-lock forces, have higher safety in utilization, and two balls 43 slide and the synchronism of self-locking work can be better.

See through ball 43 and optionally be fastened in the latching point place moving of 44,420 of inside and outside ball orbits, can make self-locking overcoat 42 optionally with lock together from lock core 41, therefore tube 20 can be fixed in the place, desired position.In detail, when self-locking overcoat 42 is not locked on lock core 41 by ball 43, self-locking overcoat 42 can be driven and with respect to rotating from lock core 41 by tube 20, and when self-locking overcoat 42 is locked on lock core 41 by ball 43, self-locking overcoat 42 can pin down tube 20, makes tube 20 can't go rotation again.In the recovery and dispose procedure of projection screen 1, two balls 43 can be respectively slip in separately interior ball orbit 44 and outer ball orbit 420, and optionally carry out the self-locking operation.

Hereinafter the structure that will be disclosed with first embodiment is an example, drop-down (release), location, release and the recovery principle of projection screen 1 is done the description of an integrality.

When the drop-down projection screen 1 of operator, projection screen 1 drives tube 20 and clockwise rotates, and torque spring 30 can produce distortion and accumulate certain recovery power, and tube 20 drives self-locking overcoats 42 and clockwise rotates together.At the same time, ball 43 in the self-locking structure can horizontally slip in the straight-line groove (ball orbit 420 promptly) of self-locking overcoat 42, and ball 43 can be subjected to the driving of the straight-line groove 420 of self-locking overcoat 42, and from from the 4th curved slot 445 of the interior ball orbit 44 of lock core 41, slipping over and slipping in the oblique line groove 440 (promptly entering first communication path) at the intersection of the 4th curved slot 445 with oblique line groove 440, slip in first curved slot 441 via first communication path then, and in first curved slot 441 around the movement.

Projection screen 1 launches downwards and when desiring to be located, the operator stops drop-down, tube 20 meetings are in the effect turning down (promptly being rotated counterclockwise) of the restoring force of torque spring 30, ball 43 can enter second communication path from first curved slot 441, in detail, ball 43 enters second curved slot 442 and slides in first detent 443 (latching point) again, this moment, ball 43 was limited in first detent 443 of lock core 41, ball 43 can not continue left and right sides slippage in the straight-line groove 420 of self-locking overcoat 42, thereby prevent 42 revolutions of self-locking overcoat, tube 20 is subjected to pining down of self-locking overcoat 42, can not turn round, so just can be with projection screen 1 location.The random location that the projection curtain device 100 of the embodiment of the invention can be realized projection screen 1 by self-locking structure, the self-locking position of projection screen 1 are to be made it rest on any position by any selecting.

When needs reclaim projection screen 1, at first, the operator will drop-down gently projection screen 1, tube 20 drives self-locking overcoat 42 and clockwise rotates certain angle together, straight-line groove 420 drives ball 43 and slides, make ball 43 in first detent 443 (latching point), deviate from, slip in second detent 446 (flex point), under normal circumstances, this moment, the operator can discharge projection screen 1 fully, under the effect of the restoring force of torque spring 30, tube 20 drives self-locking overcoats 42 and rotates counterclockwise together, and ball 43 can skid off from second detent 446, and enter the 4th curved slot 445 through the 3rd curved slot 444, projection screen 1 continues upwards to reclaim, and ball 43 meetings around the movement in the 4th curved slot 445 finishes until projection screen 1 recovery.

But; when separating self-locking; ball 43 regular meetings are limited in second detent 446; this moment, the operator need strengthen the pulling force that release is used a little; make ball 43 directly enter first communication path via fluting 448, then around the movement in oblique line groove 440 slides to first curved slot 441 from second detent 446.At last, the operator discharges projection screen 1 fully, under the effect of the restoring force of torque spring 30, tube 20 drives self-locking overcoat 42 and rotates counterclockwise together, ball 43 can enter the 4th curved slot 445 via second curved slot 442 and the 3rd curved slot 444 from first curved slot 441, projection screen 1 continues upwards to reclaim, and ball 43 meetings around the movement in the 4th curved slot 445 finishes until projection screen 1 recovery.

In the releasing process of first embodiment, projection screen 1 is the terminal position (this terminal position is meant the Trail termination 449 of second communication path) that is recycled to the 3rd curved slot 444 from corner position, the distance that reclaims at the terminal position of corner position to the three curved slots 444 is called first and reclaims length, in the present embodiment, the first recovery length is greater than first pulldown length of ball 43 from latching point (i.e. first detent 443) to flex point (i.e. second detent 446).Therefore, first pulldown length is not enough to make ball 43 to break away from the terminal position of the 3rd curved slot 444 and removes self-locking that ball 43 slides to flex point from latching point, and then directly enters in first communication path via fluting 448.In this way, it is stuck in the flex point place that the projection curtain device 100 of present embodiment can be avoided ball 43.

Please refer to Figure 11, wherein demonstrate the self-locking mechanism 4 of second embodiment of the invention, the element numbers that element numbers and following description are adopted among the figure is still continued to use the element numbers among first embodiment, with simplified illustration.Fluting 448 (as shown in Figure 10 B) are not set on the orbit sidewall 447 of the self-locking mechanism 4 of second embodiment, but the internal diameter of first switch spring 45 of self-locking mechanism 4 is designed to internal diameter (also promptly the number of turns of first switch spring 45 is number of turns less than second switch spring 46) greater than second switch spring 46, the switch spring 45 of winning can optionally be prevented from lock core 41 with respect to self-locking shaft 40 (being first direction) rotation along clockwise direction, second switch spring 46 then can prevent fully from lock core 41 with respect to self-locking shaft 40 in the counterclockwise direction (being second direction) rotate, can prevent the stuck phenomenon in flex point place like this.In detail, launch projection screen 1 and during normal drop-down projection screen 1, first switch spring 45 can be prevented from lock core 41 with respect to self-locking shaft 40 along clockwise direction when needs.In the process of expansion and positioning projection's curtain 1, ball 43 among second embodiment is (not shown in the figures, continue to use the label among first embodiment herein) sliding path be same as the sliding path of the ball 43 among first embodiment, projection screen 1 is launched smoothly and is located.When separating self-locking, if ball 43 is limited in second detent 446 (flex point), the operator strengthens the pulling force that release is used, this moment is because the internal diameter of first switch spring 45 is bigger, under the effect of big pulling force, overcome friction force between first switch spring 45 and the self-locking shaft 40 from lock core 41, and turn an angle along clockwise direction with respect to self-locking shaft 40, can guarantee that like this first pulldown length reclaims length greater than first, can make ball 43 break away from the end of the 3rd curved slot 444 fully and remove self-locking from flex point.At last, the operator discharges projection screen 1 fully, under the effect of the restoring force of torque spring 30, tube 20 drives self-locking overcoat 42 and rotates counterclockwise together, second switch spring 46 can be prevented from lock core 41 with respect to self-locking shaft 40 in the counterclockwise direction at this moment, ball 43 is around the movement in the 4th curved slot 445 then, reclaims until projection screen 1 to finish.Certainly, the self-locking mechanism 4 of other embodiment can adopt the structure of first switch spring 45 of fluting 448 structures of first embodiment and second embodiment simultaneously, with the safety in utilization of further raising self-locking mechanism 4.

In the releasing process of second embodiment, projection screen 1 is the terminal position (this terminal position is meant the Trail termination 449 of second communication path) that is recycled to the 3rd curved slot 444 from corner position, the distance that reclaims at the terminal position of corner position to the three curved slots 444 is called first and reclaims length, and first to reclaim length be greater than first pulldown length of ball 43 from latching point (i.e. first detent 443) to flex point (i.e. second detent 446).Therefore, first pulldown length is not enough to make ball 43 to break away from the terminal position of the 3rd curved slot 444 and removes self-locking, ball 43 slides to flex point from latching point, then by rotating by force from lock core 41, this moment is because the internal diameter of first switch spring 45 is bigger, under the effect of big pulling force, overcome friction force between first switch spring 45 and the self-locking shaft 40 from lock core 41, and turn an angle along clockwise direction with respect to self-locking shaft 40, make the drop-down by force again segment distance of projection screen 1, can guarantee that like this first pulldown length reclaims length greater than first, can make ball 43 break away from the end of the 3rd curved slot 444 fully and remove self-locking, make ball 43 slip over the end of the 3rd curved slot 444 and enter in the 4th curved slot 445 from second detent 446 from flex point.At last, discharge projection screen 1, ball 43 meetings around the movement in the 4th curved slot 445 finishes until projection screen 1 recovery.In this way, it is stuck in the flex point place that the projection curtain device 100 of present embodiment can be avoided ball 43.

The anti-jamming design of the 3rd embodiment is different from the design of the first bigger switch spring 45 of the employing internal diameter of fluting 448 structures of first embodiment and second embodiment.The self-locking mechanism synoptic diagram of the 3rd embodiment can be with reference to the self-locking mechanism 4 of second embodiment shown in Figure 11, below element numbers that the description of the 3rd embodiment is adopted still continue to use element numbers among first embodiment.In the 3rd embodiment, first pulldown length between latching point (i.e. first detent 443) and the flex point (i.e. second detent 446) is the recovery length (promptly first reclaiming length) more than or equal to the 3rd curved slot 444.

In the releasing process of the 3rd embodiment, projection screen 1 is the terminal position (this terminal position is meant the Trail termination 449 of second communication path) that is recovered to the 3rd curved slot 444 from corner position, terminal position at corner position to the three curved slots 444 also forms the first recovery length, and the first recovery length is to be less than or equal to first pulldown length of ball 43 from latching point (i.e. first detent 443) to flex point (i.e. second detent 446).Therefore, first reclaims length is enough to make ball 43 to slide to flex point from latching point, discharge projection screen 1 this moment, ball 43 can skid off from the flex point place, and enter the 4th curved slot 445 smoothly through the 3rd curved slot 444, projection screen 1 continues upwards to reclaim, and ball 43 meetings around the movement in the 4th curved slot 445 finishes until projection screen 1 recovery.In this way, it is stuck in the flex point place that the projection curtain device 100 of present embodiment can be avoided ball 43.

Claims (19)

1. projection curtain device, include: a projection screen and a self-locking mechanism, wherein this self-locking mechanism is in order to locate this projection screen, this self-locking mechanism includes: a self-locking overcoat, a self-locking shaft, are from lock core and at least one ball, wherein should be installed on this self-locking shaft from lock core, ball orbit in having at least one group, should have several grooves by interior ball orbit, these grooves are formed with one first communication path and one second communication path that connects, and wherein a latching point and a flex point are to be positioned on this second communication path; This self-locking overcoat can be placed on this on lock core rotationally, and is provided with at least one group of outer ball orbit, corresponding to this from lock core should in ball orbit, wherein, this outer ball orbit comprises a straight-line groove; This ball can this from lock core should on the ball orbit and this self-locking overcoat should outside move on the ball orbit, wherein when this projection screen is in a self-locking position, drop-down this projection screen, this ball can move to this flex point from this latching point, and when this ball is positioned at this flex point, reclaim this projection screen, this ball can move to the Trail termination that this second communication path is adjacent to this flex point from this flex point; It is characterized in that: have one first pulldown length between this latching point and this flex point, adjacent on this flex point and this second communication path is bordering on to have one first between this Trail termination of this flex point and reclaims length; Wherein this first pulldown length first reclaims length more than or equal to this, makes this ball when this latching point moves to this flex point, and this ball can shift out this second communication path from this flex point, and is stuck in this flex point place to avoid this ball.

2. projection curtain device as claimed in claim 1, it is characterized in that: this self-locking mechanism more includes one first switch spring and a second switch spring, this first switch spring and this second switch spring are installed on this self-locking shaft, and lay respectively at this both sides from lock core, the internal diameter of this first switch spring is greater than the internal diameter of this second switch spring, this first switch spring should rotate along a first direction with respect to this self-locking shaft from lock core in order to optionally to prevent, and this second switch spring can prevent this to rotate along a second direction opposite with this first direction with respect to this self-locking shaft from lock core.

3. projection curtain device as claimed in claim 2, it is characterized in that: this first switch spring is the volute spring of a levoform, this second switch spring is the volute spring of a dextrorotation formula, and the number of turns of this first switch spring is less than the number of turns of this second switch spring.

4. projection curtain device as claimed in claim 1, it is characterized in that: these grooves of ball orbit comprise an oblique line groove, one first curved slot, one second curved slot, one first detent, one second detent, one the 3rd curved slot and one the 4th curved slot in this, this first detent is as this latching point, this second detent is as this flex point, and this flex point is between this first detent and the 3rd curved slot.

5. projection curtain device as claimed in claim 4, it is characterized in that: this first curved slot and the 4th curved slot are all around this outer surface setting from lock core, this oblique line groove is then to become to be communicated between this first curved slot and the 4th curved slot with respect to this axis from lock core skewedly, to constitute this first communication path between this first curved slot and the 4th curved slot.

6. projection curtain device as claimed in claim 5, it is characterized in that: this first detent and this second detent are arranged between this first curved slot and the 4th curved slot, and and second curved slot and the 3rd curved slot constitute second communication path that is communicated between this first curved slot and the 4th curved slot, wherein this first detent is adjacent to this second curved slot and is connected to this first curved slot by this second curved slot, and this second detent is adjacent to the 3rd curved slot and is connected to the 4th curved slot by the 3rd curved slot.

7. projection curtain device as claimed in claim 6, it is characterized in that: between this first communication path and this second communication path, have more an orbit sidewall, and be provided with a fluting in this orbit sidewall, in order to be communicated with this second detent and this first communication path.

8. projection curtain device as claimed in claim 7 is characterized in that: this first pulldown length is formed between this first detent and this second detent, and this first recovery length is the length of run of the 3rd curved slot.

9. projection curtain device as claimed in claim 1, it is characterized in that: this projection curtain device further includes a jack that is connected with this projection screen, this jack can be optionally rotates and discharges this projection screen along a first direction, and can optionally reclaim this projection screen along a second direction rotation opposite with this first direction.

10. projection curtain device as claimed in claim 9, it is characterized in that: this projection curtain device further includes an actuating unit that is connected with this jack, in order to provide one to reclaim power,, this jack reclaims this projection screen so that rotating along this second direction to this jack.

11. projection curtain device as claimed in claim 10 is characterized in that: this self-locking overcoat is connected with this jack.

12. projection curtain device, include: a projection screen and a self-locking mechanism, wherein this self-locking mechanism is in order to locate this projection screen, this self-locking mechanism includes: a self-locking overcoat, a self-locking shaft, are from lock core and at least one ball, wherein should be installed on this self-locking shaft from lock core, and ball orbit in having at least one group, should have several grooves by interior ball orbit, these grooves are formed with one first communication path and one second communication path that connects, and wherein a latching point and a flex point are to be positioned on this second communication path; This self-locking overcoat can be placed on this on lock core rotationally, and is provided with at least one group of outer ball orbit, corresponding to this from lock core should in ball orbit, wherein, this outer ball orbit comprises a straight-line groove; This ball can this from lock core should on the ball orbit and this self-locking overcoat should outside move on the ball orbit, wherein when this projection screen is in a self-locking position, drop-down this projection screen, this ball can move to this flex point from this latching point, and when this ball is positioned at this flex point, reclaim this projection screen, this ball can move to the Trail termination that this second communication path is adjacent to this flex point from this flex point; It is characterized in that: between this latching point and this flex point, have one first pulldown length, be formed with one first and reclaim length between this Trail termination on this flex point and this second communication path and that this flex point is adjoining, this flex point connects this first recovery length and this first communication path by a fluting; This first reclaims length more than or equal to this first pulldown length, make when this ball when this latching point moves to this flex point, can enter in this first communication path, stuck to avoid this ball in this flex point place.

13. projection curtain device as claimed in claim 12, it is characterized in that: this self-locking mechanism more includes one first switch spring and a second switch spring, this first switch spring and this second switch spring are installed on this self-locking shaft, and lay respectively at this both sides from lock core, the internal diameter of this first switch spring is greater than the internal diameter of this second switch spring, this first switch spring should rotate along a first direction with respect to this self-locking shaft from lock core in order to optionally to prevent, and this second switch spring can prevent this to rotate along a second direction opposite with this first direction with respect to this self-locking shaft from lock core.

14. projection curtain device as claimed in claim 13, it is characterized in that: this first switch spring is the volute spring of a levoform, this second switch spring is the volute spring of a dextrorotation formula, and the number of turns of this first switch spring is less than the number of turns of this second switch spring.

15. projection curtain device as claimed in claim 12, it is characterized in that: these grooves of ball orbit comprise an oblique line groove, one first curved slot, one second curved slot, one first detent, one second detent, one the 3rd curved slot and one the 4th curved slot in this, this first detent is as this latching point, this second detent is as this flex point, and this flex point is between this first detent and the 3rd curved slot.

16. projection curtain device as claimed in claim 15, it is characterized in that: this first curved slot and the 4th curved slot are all around this outer surface setting from lock core, this oblique line groove is then to become to be communicated between this first curved slot and the 4th curved slot with respect to this axis from lock core skewedly, to constitute this first communication path between this first and the 4th curved slot.

17. projection curtain device as claimed in claim 16, it is characterized in that: this first detent and this second detent are arranged between this first curved slot and the 4th curved slot, and see through this second curved slot and the 3rd curved slot is connected to this first curved slot and the 4th curved slot respectively, and constitute this second communication path that is communicated between this first curved slot and the 4th curved slot.

18. projection curtain device as claimed in claim 17, it is characterized in that: between this first communication path and this second communication path, have more an orbit sidewall, and this fluting is arranged on this orbit sidewall in order to be communicated with this second detent and this first communication path.

19. projection curtain device as claimed in claim 18 is characterized in that: this first pulldown length is formed between this first detent and this second detent, and this first recovery length is the length of run of the 3rd curved slot.

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