US3314467A

US3314467A - Collapsible portable projection screen

Info

Publication number: US3314467A
Application number: US372477A
Authority: US
Inventors: Robert E Jacobson
Original assignee: Radiant Manufacturing Corp
Current assignee: Radiant Manufacturing Corp
Priority date: 1964-06-04
Filing date: 1964-06-04
Publication date: 1967-04-18
Anticipated expiration: 1984-04-18

Description

April 18, 1967 RE. JACOBSON COLLAPSIBLE PORTABLE PROJECTION SCREEN s Shets-Sheet 1 Filed June 4, 1964 INVENTOR. rZ'i T J BY M v g h-rJn-a Jicolzfoiz 3 Sheets-Sheet 2 w a 7; 2 EL i l @m Aw J 1.

April 18, 1967 R. E JACOBSON COLLAPSIBLE PORTABLE PROJECTION SCREEN Filed June 4, 1964 April 1967 R. E. JACOBSONV 3,314,467 I COLLAPSIBLE PORTABLE PROJECTION SCREEN Filed June 4, 1964 3 Sheets-Sheet 5 United States Patent 3,314,467 COLLAPSIBLE PORTABLE PROJECTION SCREEN Robert E. Jacobson, Elk Grove Village, Ill, assignor to Radiant Manufacturing Corporation, Morton Grove, 11]., a corporation of Illinois Filed June 4, 1964, Ser. No. 372,477 7 Claims. (Cl. 16024) This invention is directed to a collapsible portable projection screen of the type disclosed in Hermann Muller Patent No. 3,087,535, issued Apr. 30, 1963, and constitutes an improvement thereover.

The principal object of this invention is to provide an improved collapsible portable projection screen of this general type which is simple and inexpensive in construction, which may be readily assembled, which may be easily manipulated for picture exhibiting and storage or transportation purposes, and which is foolproof in operation.

Briefly, the collapsible portable projection screen of this invention includes a hollow supporting post with a first member slidably mounted in the supporting post and projecting upwardly therefrom. A pair of arms are pivotally connected at their inner ends to the upwardly projecting first member and a pair of links are pivotally connected to the supporting post and to the pair of arms intermediate the ends thereof. A flexible screen is connected at one end to a spring wound roller on which it is normally rolled and is connected at its other end to a suspension slat, the spring wound roller and the suspension slat being substantially parallel to the supporting post.

The spring wound roller and the suspension slat are pivotally connected to the outer ends of the arms so that said first member is raised and the flexible screen is rolled on the spring wound roller and the spring wound roller and the suspension slat are positioned adjacent the supporting post when the pair of arms is collapsed along the supporting post, and so that said first member is lowered and the spring wound roller and the suspension slat are positioned away from the supporting post and the flexible screen is unrolled from the spring wound IIOller when the pair of arms is extended laterally and over center from the supporting post.

The supporting post also slidably mounts a second member projecting downwardly from the post. A .plurality of legs are pivotally connected at their upper ends to the supporting post and a plurality of links are pivotally connected to the downwardly projecting second member and to the plurality of legs intermediate the ends thereof, the plurality of legs being collapsed to a position substantially parallel to the supporting post when said second member is raised and being extended outwardly to stand the supporting post on a surface when the second member is lowered. Spring means are arranged within the supporting post and connections are provided between the spring means, the supporting post and the first member for resiliently urging the first member downwardly. A two-way lost motion connection, preferably in the form of a pin and slot connection, connects the first and second members and provides for limited relative movement between the first and second members and also positive movement of the second member by the first member.

When the projection screen is in its collapsed position for transportation and storage purposes, the spring wound roller and suspension slat are adjacent the supporting post, the flexible screen is rolled on the spring wound roller, the first member is raised against the action of the spring means, and the two-Way lost motion connection positively holds the second member in its raised position 3,314,467 Patented Apr. 18, 1967 to hold the legs in their collapsed position, the various parts being held in these positions by the spring force of the spring wound roller. To set up the collapsible portable projection screen for picture exhibiting purposes, the spring wound roller and suspension slat are manually moved apart and away from the supporting post and, in so doing, the arms are extended and the first member is lowered, the spring means in the supporting post, in conjunction with the changing leverage of the arms, aiding in this movement and compensating for the increasing spring force of the spring wound roller as the flexible screen is being unrolled. During the'latter part of this screen opening movement, the first member engages the second member, through the two-way lost motion connection, positively to move the latter downwardly to extend the legs for supporting the projection screen in picture exhibiting position upon the floor or other supporting surface.

When the projection screen is in picture exhibiting position, the extended arms have been moved over center, and stop means on the supporting post and the first member maintain the picture exhibiting position. The projection screen may also be provided with means for independently tensioning the flexible screen in picture exhibiting position to present a tensioned and flat screen surface. This tensioning means may comprise suitable means, such as a ltnob and releasable locking means associated therewith, for independently rotating and releasably locking the spring wound roller.

To collapse the projection screen for transportation or storage purposes, the separated spring Wound roller and suspension slat are grasped and first pushed downwardly to start upward movement of the first member and reverse over center movement of the arms. When the arms are so moved over center, the spring force of the spring wound roller causes rolling of the flexible screen on the spring wound roller and collapsing of the spring wound roller and suspension slat to a position adjacent the sup-' :porting post. This also causes continued raising of the first member. Since there is a two-way lost motion connection between the first member and the second member, the legs may remain extended and in firm contact with the floor or other supporting surface during the return over center movement of the arms and the initial movement of the first member. However, during the final part of the upward movement of the first member, the two-way lost motion connection positively pulls the second member upwardly to collapse the legs as the spring wound roller and suspension slat are being collapsed.

The spring wound roller and the suspension slat are preferably provided with guide pins which engage the pair of arms when the projection screen is collapsed to assist in maintaining the substantially parallel relationship between them and the supporting post. Also, a

clamp device is also preferably provided for the pivotal connections between the arms and the spring wound roller and the suspension slat for positively locking the projection screen in its collapsed position.

Further objects of this invention reside in the details of construction of the collapsible portable projection screen and in the cooperative relationships between component parts thereof.

Other objects and advantages of this invention will become apparent to those skilled in the art upon reference to the accompanying specification, claims and drawings in which:

FIG. 1 is a rear view of the collapsible portable projection screen of this invention illustrating the same in extended position for picture exhibiting purposes;

FIG. 2 is a view similar to FIG. 1 but showing the collapsible portable projection screen during the collapsing movement toward a collapsed position for storage or transportation purposes;

FIG. 3 is a partial view illustrating the clamping device for locking the projection screen in its collapsed position;

FIG. 4 is an enlarged sectional view of a portion of the projection screen in the extended position as illustrated in the center of FIG. 1;

FIG. 5 is a view similar to FIG. 4 but showing the projection screen in partial collapsed position as illustrated in the center of FIG. 2;

FIG. 6 is a view similar to FIGS. 4 and 5 but illustrating the projection screen in its collapsed position for storage and transportation purposes;

FIG. 7 is a partial front elevational view, partly in section, of the projection screen;

FIG. 8 is a view of the projection screen looking from the top of FIG. 7 with parts broken away; and

FIG. 9 is a sectional view through the spring wound roller illustrated in FIG. 7.

The collapsible portable projection screen of this invention is generally designated at 10 and it includes a hollow supporting post 11 and a first member 12 slidably mounted inthe supporting post 11. The first mem ber 12 extends upwardly beyond the supporting post 11 and a bracket 13 is suitably secured to the upwardly extending portion thereof. The bracket 13 is provided with a shoulder 14 which is adapted to engage a cap or shoulder 15 on the supporting post 11 when the projection screen is extended for picture exhibiting purposes as illustrated in FIGS. 1 and 4. The first member 12 also extends'below the supporting post 11 when it is in a lowered position as illustrated in FIG. 4. A pair of arms 16 are pivotally connected by pivot pins 17 to the bracket 13 and hence to the upwardly projecting portion of the first member 12. A bracket 18 is fixedly secured to the outside of the supporting post 11 below the top thereof. A pair of links 19 are pivotally connected at 20 to the bracket 18 and at 21 to the arms 16 intermediate the ends thereof.

The collapsible portable projection screen 10 also includes a spring wound roller 25 which is rotatably mounted in a screen case 26. One end of a flexible screen 27 is secured to the roller 25 and a spring 28 operates to rotate the roller 25 for the purpose of rolling the flexible screen 27 onto the roller 25. The other end of the flexible screen 27 is suitable secured to a suspension slat 29. When the suspension slat 29 is moved away from the spring wound roller 25 the flexible screen 27 is unrolled from the roller 25 against the action of the roller spring 28. When the suspension slat 29 is moved towards towards the roller 25, the spring 28 rotates the roller 25 to roll the flexible screen 27 onto the roller 25. The spring 28 always resiliently biases the roller 25 to roll the flexible screen 27 onthe roller 25. The screen case 26 and hence the roller 25 are pivotally connected at 30 to the outer end of one of the arms 16 and the suspension slat 29 is pivotally connected at 31 to the outer end of the other arm 16. The screen case 26 and the suspension slat 29 are provided with handles 32 which may be grasped for the purpose of moving the suspension slat 29 with respect to the spring wound roller 25, toward each other and away from each other.

When the projection screen is in collapsed position for storage and transportation purposes, the spring wound roller 25 and the suspension slat 29 are brought together adjacent the supporting post 11 as illustrated in FIG. 6, the spring wound roller 25 and the suspension slat 29 being substantially parallel to the supporting post 11 and the spring 28 operating to maintain the parts in this collapsed position. When the spring wound roller 25 and the suspension slat 29 are separated, the arms 16 are extended and at the latter part of this extending movement the arms 16 swing over center as illustrated in FIGS. 1 and 4 and the shoulders 14 and 1S engage each other to position the projection screen for picture exhibiting purposes. As the spring wound roller 25 and the suspension slat 29 are so manipulated and the arms 16 so moved, the first member 12 slidably moves upwardly and downwardly within the supporting post 11.

The collapsible portable projection screen 10 also includes a second member 35 which is slidably movable within the supporting post 11, the second member 35 projecting downwardly from the supporting post 11. In the specific form here illustrated, the first member 12 is slidably mounted in the second member 35 which in turn is slidably mounted in the supporting post 11. The two

members

35 and 12 are movable with respect to each other. Rigidly secured to the bottom of the supporting post 11 is a bracket 36 and the upper ends of a plurality of legs 37 are pivotally connected to this bracket 36 as indicated at 38. The lower end of the second member 35 carries a bracket 39 to which are pivotally connected the inner ends of a plurality of links 40 as indicated at 41. The outer ends of the links 40 are pivotally connected at 42 to the legs 36 intermediate the ends thereof. For purposes of illustration, three legs 37 and links 40 are utilized to provide the collapsible stand for the projection screen. At least one of the pivots 42 may be provided with a spring 44 for normally tending to urge the legs 37 to the extended position as illustrated in FIG. 4.

A spring 45 is interposed between the cap or shoulder 15 and a pin 46 carried by the first member 12, and the spring 45 resilently biases the first member 12 down- Wardly. The first member 12 and the second member 35 are connected together by a two-way lost motion connection comprising a slot in the second member 35 and a pin 48 carried by the first member 12 and projecting into the slot, the two-way lost motion connection permitting limited relative movement between the first and second members but providing for positive movement of the second member by the first member. When the second member 35 is moved upwardly, the legs 37 are collapsed to -a position substantially parallel to the supporting post 11 as illustrated in FIG. 6 and, when the second member 35 is moved downwardly, the legs 37 are extended as illustrated in FIG. 4 for the purpose of supporting the projection screen on the floor or other suitable supporting surface.

The collapsible portable projection screen is illustrated in its collapsed position for transportation and storage purposes in FIG. 6. The screen case 26 and the spring wound roller 25 therein and the suspension slat 29 are adjacent the supporting post 11, the flexible screen 27 is rolled on the spring wound roller 25, the first member 12 is raised, and the slot and

pin connection

47, 48 positively holds the second member 35 in its raised position to hold the legs 37 in their collapsed position. The various parts are held in these positions by the spring force of the spirng 28 of the spring wound roller 25. To set up the projection screen for picture exhibiting purposes, the handles 32 are grasped and the screen case 26 (with the spring Wound roller 25 therein) and the suspension slat 29 are manually moved apart and away from the supporting post 11 and, in so doing, the arms 16 are extended and the first member 12 is lowered. The. spring means 45 in the supporting post acts in conjunction with the changing leverage of the arms 16 for aiding in this movement and for compensating for the increased spring force of the spring 28 in the spring wound roller 25 as the flexible screen 27 is being unrolled from the roller. During the latter part of this screen opening movement, the pin 48 on the first member 12 engages the lower end of the slot 47 in the second member 35 tomove the second member 35 downwardly to extend the legs 37 for supporting the projection screen in picture exhibiting position upon the floor or other supporting surface as illustrated in FIGS. 1 and 4. When the projection screen is in picture exhibiting position, the

extended arms 16 have been moved over center and the stop means or shoulders and 14 on the supporting post 11 and the bracket 13 operate to maintain this picture exhibiting position. Here, both the spring 28 of the spring wound roller and the spring 45 operate to maintain this picture exhibiting position.

To collapse the projection screen for transportation or storage purposes, the handles 32 on the separated screen case 26 and suspension slat 29 are grasped and first pushed downwardly to start upward movement of the first member 12 and reverse over center movement of the arms 16. When the arms 16 are so moved over center as illustrated in FIG. 5, the spring force of the spring 28 in the spring wound roller causes rolling of the flexible screen 27 on the spring wound roller 25 and collapsing of the screen case 26 and the suspension slat 29 to a position adjacent the supporting post 11 as illustrated in FIG. 6. This also causes continued raising of the first member 12. Because of the slot and

pin connection

47, 48 between the first member 12 and the second member 35, the legs 37 remain extended and in firm contact with the floor or other supporting surface during the return over center movement of the arms 16 and the initial movement of the first member 12 as illustrated in FIG. 5. Thus, there is no force tending to collapse the legs 37 during the pushing downwardly on the handles and this initial mavement of the first member 12. A very stable operation in collapsing the projection screen is thereby provided. However, during the final part of the upward rn-oevment of the first member 12 from the position illustrated in FIG. 5 to the position illustrated in FIG. 6, the pin 43 on the first member 12 engages the upper end of the slot 47 in the second member to positively pull the second member 35 upwardly to collapse the legs 37 as the screen case 26 and suspension slat 29 are being collapsed adjacent the supporting post 211.

Referring more particularly to FIGS. 7 to 9, the spring wound roller 25 is carried by a plurality of

spiders

50, 51 and 52. The spiders and 52 are journaled for rotation on a shaft 53 which is provided at its outer end with a flattened portion 54 so as to be secured against rotation in one end Wall of the screen case 26. One end of the spring 28 is secured to the spider 50 and the other end is secured to the inner end of the shaft 53, the spring 28 operating to rotate the roller 25 in a direction to roll the flexible screen 27 on the roller. The spider 51 has a stub shaft 55 fixedly secured thereto, the stub shaft 55 being rotatable mounted in the other end wall of the screen case 26. The stub shaft 55 has a portion extending outwardly from the end Wall of the screen case 26 which is flattened as indicated at 56 for receiving a knob 57. The knob 57 carries a plunger 58 which is urged outwardly by a spring 59. The plunger 58 is provided with a projection 69 which is adapted to be received in one of a plurality of holes 61 which are arranged in the end wall of the screen case concentrically with the stub shaft 55. Thus the knob 57 may be manually rotated to rotate the roller 25 to roll the flexible screen 27 thereon and, hence, tension the flexible screen. When the desired amount of tension is thus applied to the flexible screen 27, the plunger 58 is depressed to cause its projection 60 to enter one of the holes 61 to lock the knob 57 and, hence, the spring wound roller 25 in that position with the desired amount of tension applied to the flexible screen. This tensioning of the flexible screen 27 by this means is made possible by the

stop members

15 and 14 engaging each other in picture exhibting position. In this way, when the collapsible portable projection screen is in its extended picture exhibiting position, the flexible screen 27 may be independently tensioned to present a tensioned and flat screen surface for picture exhibiting purposes. Since knob 57 is connected to roller 25, tensioning of the roller by spring 23 will bind projection 60 in hole 61 so as to lock the knob against rotation with respect to casing 26. To release the tenison on the flexible screen 27, all that is necessary is to rotate the knob 57 a slight amount in the tensioning direction whereupon the spring 59 pushes the plunger 58 outwardly to release the projection 69 from the hole 61.

One end of the flexible screen 27 may be secured to the spring wound roller 25 in any suitable manner and a particularly satisfactory manner of securing the other end of the flexible screen 27 to the suspension slat 29 is illustrated in the right hand portion of FIG. 8. Here, a rope or cord 64 is stitched to the flexible screen 27 and is inserted into the suspension slat 29 over a metallic strip 65 which is secured to the suspension slat by screws 66. The stitched rope or cord 64 engages the strip 65 and positively secured this end of the flexible screen 27 in the suspension slat 29.

The pivotal connections 3!) and 31 for connecting the ends of the arms 16 to the screen case 26 and the suspension slat 29 are in the form of pins and, as ShOWn more clearly in FIG. 3, a clamping member 63 is pivotally carried by the pin 30 and is adapted to be releasably received on the pin 31. When the clamping member 68 so clamps the

pins

36 and 31, the projection screen is posi tively releasably clamped in its collapsed position so as to positively maintain this collapsed position for transportation and storage purposes. The screen case 26 and the suspension slat 29 also carry

guide fins

70 and 71 which are adapted to engage the arms 16 when the projection screen is in its collapsed position. These guide

fins

70 and 71 engaging the arms 16 operate in conjunction with the

pivotal connections

36 and 31 for maintaining the substantially parallel relationship between the supporting post 11 and the screen case 26 and suspension slat 29 when in collapsed position for storage and transportation purposes.

While for purposes of illustration one form of this inicention has been disclosed, other forms thereof may become apparent to those skilled in the art upon reference to this disclosure and, therefore, this invention should be limited only by the scope of the appended claims.

I claim as my invention:

1. A collapsible portable projection screen comprising a supporting post, a first member slidably carried by the supporting post, a spring wound roller substantially parallel to the supporting post, a suspension slat substantially parallel to the supporting post, a flexible screen connected to the spring Wound roller and the suspension slat and normally rolled on the spring wound roller, a plurality of arms each pivotally connected at one end to the first member and the other end to the spring wound roller and suspension slat, respectively, a plurality of links each having one end pivotally connected to an arm and the other end to said supporting post, said arms and said links being arranged for moving said first member in one direction and for positioning said spring wound roller and suspension slat in one position adjacent the supporting post, and for moving said first member in the other direction and for positioning said spring wound roller and suspension slat in another position away from the supporting post, a second member slidably carried by said supporting post, a plurality of legs each pivotally connected adjacent one end thereof to said supporting post, a plurality of links each pivotally connected between a leg intermediate the ends thereof and said second member for positioning said legs in one position substantially parallel to said supporting post and moving with said second member in one direction, and for positioning said legs in another position extending away from the supporting post and moving with said second member in the other direction, a spring in the supporting post operatively connected between said supporting post and said first member for resiliently urging said first member in said other direction, and a twoway lost motion connection between said first member and said second member for allowing relative movement between said first and second members, for positively moving said second member in said other direction during the latter part of the movement of said first member in said other direction, and for positively moving said second member in said one direction during the latter part of the movement of said first member in said one direction.

2. A collapsible portable projecton screen as in claim 1 including guide fins carried by said spring wound roller and suspension slat engaging said arms when said spring wound roller and suspension slat are in said one position.

3. A collapsible portable projection screen as in claim 1 wherein said two-way lost motion connection is of the pin and slot-type including an elongated slot in the second member and a pin secured to the first member and operatively engaged with said slot.

4. A collaspible portable projection screen as in claim 2 including releasable clamping means associated with the means pivotally connecting the arms to the spring woundroller and suspension slat, respectively, for releasably locking the spring wound roller and the suspension slat in said position adjacent the supporting post.

5. A collapsible portable projection screen comprising a hollow supporting post, a first member slidably mounted in the supporting post and projecting upwardly therefrom, a pair of arms pivotally connected at their inner ends to the upwardly projecting first member, a pair of links each pivotally connected at one end to the supporting post and at the other end to one of said arms intermediate the end thereof the arms being movable from a storage position adjacent the supporting post and below a generally horizontal line through the pivotal connections of the arms to the supporting post to a laterally extending position 'overcenter and above said generally horizontal line, a

spring wound roller substantially parallel to the support ing post, a suspension slat substantially parallel to the supporting post, a flexible screen connected at one end to the spring wound roller and at its other end to the suspension slat and normally rolled on the spring wound roller, first means pivotally connecting the spring wound roller to the outer end of one arm, and a second means pivotally connecting the suspension slat to the outer end of the other arm, said arms and links being constructed and arranged so as to raise said first member and roll the flexible screen on the spring wound roller and position the spring wound roller and suspension slat adjacent the supporting post when said pair of arms are collapsed along the supporting post, and to lower said first member and position the spring wound roller and the suspension slat away from the supporting post and unroll the flexible screen from the spring wound roller to picture exhibiting position when said pair of arms are extended laterally and over center from the supporting post, a second member slidably mounted in the supporting post and projecting downwardly therefrom, a plurality of legs each pivotally connected at their upper ends to the supporting post, a plurality of links each pivotally connected at one end to the downwardly projecting second member and at the other end to one of the plurality of legs intermediate the ends thereof, said plurality of legs being collapsed to a position substantially parallel to the supporting post when said second member is raised and being extended outwardly to stand the supporting post on a surface when said second member is lowered, a spring in the supporting post operatively connected between said supporting post and said first member for resiliently urging said first member downwardly, and a pin and slot-type two-way lost motion connection between said first member and said second member for allowing relative movement between said first and second members, for positively moving said second member downwardly during the latter part of the down ward movement of said first member, and for positively moving said second member upwardly during the latter part of the upward movement of said first member.

6. A collapsible portable projection screen comprising a supporting post, a first member slidably carried by the supporting post, a spring wound roller substantially parallel to the supporting post, a suspension slat substantially parallel to the supporting post, a flexible screen connected to the spring wound roller and the suspension slat and normally rolled on the spring wound roller, a plurality of arms each pivotally connected at one end to the first member and the other end to the spring wound roller and suspension slat, respectively, a plurality of links each having one end pivotally connected to an arm and the other end to said supporting post, said arms and links cooperating for moving said first member in one direction and for positioning said spring wound roller and suspension slat in one position adjacent the supporting post, and for moving said first member in the other direction and for positioning said spring wound roller and suspension slat in another position away from the supporting post, the arms being movable from a storage position adjacent the supporting post and below a generally horizontal line through the pivotal connections of the arms to the first member to a laterally extending position overcenter and above said generally horizontal line, a second member slidably carried by said supporting post, a plurality of legs each pivotally connected at one end to said supporting post, a plurality of links each pivotally connected be tween a leg intermediate the ends thereof and said second member for positioning said legs in one position substantially parallel to said supporting post and moving with said second member in one direction, and for positioning said legs in another position extending away from the supporting post and moving with said second member in the other direction, a spring in the supporting post operatively connected between said supporting post and said first member for resiliently urging said first member in said other direction, and a pin and slot-type two-way lost motion connection between said first member and said second member for allowing relative movement between said first and second members, for positively moving said second member in said other direction during the latter part of the movement of said first member in said other direction, and for positively moving said second member in said one direction during the latter part of the movement of said first memberin said one direction, said arms being moved over center when said spring wound roller and suspension slat are positioned in said other position, stop means for limiting movement of said arms after they have been moved over center, and means for independently tensioning said flexible screen when said spring wound roller and suspension slat are positioned in said other position.

7. A collapsible portable projection screen comprising a supporting post, a first member slidably carried by the supporting post, a spring wound roller substantially parallel to the supporting post, a suspension slat substantially parallel to the supporting post,a flexible screen connected to the spring wound roller and the suspension slat and normally rolled on the spring wound roller, a plurality of arms each pivotally connected at one end to the first member and the other end to the spring wound roller and suspension slat, respectively, a plurality of links each havmg one end pivotally connected to an arm and the other end to said supporting post, said arms and links cooperatmg for moving said first member in one direction and for positioning said spring wound roller and suspension slat n one position adjacent the supporting post, and for moving said first member in the other direction and for posltioning said spring wound roller and suspension slat in another position away from the supporting post, the arms being movable from a storage position adjacent the supporting post and below a generally horizontal line through the pivotal connections of the arms to the first member to a laterally extending position overcenter and above said generally horizontal line, a second member slidably carried by said supporting post, a plurality of legs each pivotally connected at one end to said supporting post, a plurality of links each pivotally connected between a leg intermediate the ends thereof and said second member for positioning said legs in one position substantially parallel to said supporting post and moving with said second member in one direction, and for positioning said legs in another position extending away from the supporting post and moving with said second member in the other direction, a spring in the supporting post operatively connected between said supporting post and said first member for resiliently urging said first member in said other direction, and a pin and slot-type, two-way lost motion connection between said first member and said second member for allowing relative movement between said first and second members, for positively moving said second member in said other direction during the latter part of the movement of said first member in said other direction and for positively moving said second member in said one direction during the latter part of the movement of said first member in said one direction, said arms being moved over center when said spring wound roller and suspension slat are positioned in said other position, stop means for limiting movement of said arms after they 10 have been moved over center, and means for independently rotating and releasa bly locking said spring wound roller when said spring wound roller and suspension slat are positioned in said other position for independently tensioning said flexible screen.

References Cited by the Examiner UNITED STATES PATENTS 816,905 4/1906 Erickson 248-171 X 1,222,805 4/1917 Schmid 160351 X 2,822,040 2/1958 Petrick et al. 160-24 2,845,244 7/1958 Prokop.

3,087,535 4/1963 Muller 16024 3,211,210 10/1965 Jacobson 16024 FOREIGN PATENTS 22,851 4/1965 Austria.

HARRISON R. MOSELEY, Primary Examiner. D. L. TAYLOR, Assistant Examiner.

Claims

1. A COLLAPSIBLE PORTABLE PROJECTING SCREEN COMPRISING A SUPPORTING POST, A FIRST MEMBER SLIDABLY CARRIED BY THE SUPPORTING POST, A SPRING WOUND ROLLER SUBSTANTIALLY PARALLEL TO THE SUPPORTING POST, A SUSPENSION SLAT SUBSTANTIALLY PARALLEL TO THE SUPPORTING POST, A FLEXIBLE SCREEN CONNECTED TO THE SPRING WOUND ROLLER AND THE SUSPENSION SLAT AND NORMALLY ROLLED ON THE SPRING WOUND ROLLER, A PLURALITY OF ARMS EACH PIVOTALLY CONNECTED AT ONE END TO THE FIRST MEMBER AND THE OTHER END TO THE SPRING WOUND ROLLER AND SUSPENSION SLAT, RESPECTIVELY, A PLURALITY OF LINKS EACH HAVING ONE END PIVOTALLY CONNECTED TO AN ARM AND THE OTHER END TO SAID SUPPORTING POST, SAID ARMS AND SAID LINKS BEING ARRANGED FOR MOVING SAID FIRST MEMBER IN ONE DIRECTION AND FOR POSITIONING SAID SPRING WOUND ROLLER AND SUSPENSION SLAT IN ONE POSITION ADJACENT THE SUPPORTING POST, AND FOR MOVING SAID FIRST MEMBER IN THE OTHER DIRECTION AND FOR POSITIONING SAID SPRING WOUND ROLLER AND SUSPENSION SLAT IN ANOTHER POSITION AWAY FROM THE SUPPORTING POST, A SECOND MEMBER SLIDABLY CARRIED BY SAID SUPPORTING POST, A PLURALITY OF LEGS EACH PIVOTALLY CONNECTED ADJACENT ONE END THEREOF TO SAID SUPPORTING POST, A PLURALITY OF LINKS