AN INFLUENCING ARRANGEMENT WITH TELESCOPICALLY VARIABLE LENGTH

Abstract: An influencing arrangement with telescopically variable length, comprising an influencing member which can be actuated by a drive shaft and moved in its longitudinal direction. The invention makes it possible to provide an arrangement which, amongst other things, is compact and has considerable stroke-length, and which consists of few complicated parts. A plurality of influencing members (2, 2', 2<2>) which are disposed co-axially relative to each other and have an outer and/or inner thread element, are connected together via a plurality of rotatable, telescopically connected drive shaft devices (8, 8') with a non-circular cross-section part, whereby rotation of the main rotary drive shaft (9) in one direction of rotation causes the said influencing members (2, 2', 2<2>) to be screwed out in order to extend the arrangement, and rotation of the said main rotary drive shaft in the opposite direction of rotation causes the said influencing members to be screwed in and closed up one inside the other.

Description: An Influencing Arrangement with telescopically variable length The present invention relates to an influencing arrangement with, telescopically variable length, com¬ prising an influencing member which can be actuated by a drive shaft and moved in its longitudinal direction. The main object of the present invention is primarily to provide an arrangement of the above-mentioned kind which is compact and also has a considerable stroke length and which is of simple construction with, few complicated parts. The said object is achieved by means of an arrange¬ ment of the above-mentioned type which, is essentially characterised in that a plurality of influencing members, which are disposed co-axially relative to each, other and have an outer and/or inner threaded element, are connect- eel together via a plurality of rotatable, telescopically connected drive shaft devices with a non-circular cross- section part, so that rotation of the main rotary drive shaft in one direction of rotation causes the said in¬ fluencing members to be screwed out in order to extend the arrangement, and rotation of the said main rotary drive shaft in the opposite direction of rotation causes the said influencing members to be screwed in and closed up one inside the other. The invention is described below by way of two pre- ferred embodiment examples, with reference to the accom ¬ panying drawings, on which Figure 1 is a schematic longitudinal section through an influencing arrangement constructed according to the invention shown in the retracted state, Figure 2 shows in detail part of an influencing mem¬ ber appertaining to the arrangement, and Figure 3 shows a further embodiment of an influenc ¬ ing arrangement constructed according to the invention, OMPI shown in a partially extended state. An influencing arrangement constructed according to the invention, which is shown in Figures 1 and 2 andwhich is designated by the numeral 1, comprises a plurality of 2 mutually coaxial influencing members 2, 2 1 , 2 , etc., 2 which preferably consist of a tube 3 S 3' . 3 etc. with a 2 nut element -, 4-', 4- etc. connected rotatably to one of 2 their ends 3A, 3'A, 3 -A-* etc., for example. The nut ele- 2 ments 4-, ' , 4- have outer threaded elements 5 alongtheir 2 respective outer casing surface 4-A, 4-Α, 4- A, while a num- 2 ber of the tubes 2', 2 have an internal threaded element 2 2 6 1 , 6 along their inner casing surface 4-'B, 4- B. ' A fur¬ ther tube 3 n , which has only an inner thread element 6 n , is securely connected to a motor baseplate 7» A plurality of drive shaft devices 8, 8-, etc. which have a non-circular cross-section part, preferably formed by four-sided tube or having some other irregular circum¬ ferential shape, are connected non-rotatably to each other or to a main rotary drive shaft 9 ° Expediently, the major- ity of the said drive shaft devices are connected, for example by welding, to an associated nut element 4-, 4-' , while the shaft 9 extends freely through a shaft passage aperture 10 adanted to the shape of the shaft 9 at the nut 2 element 4- which is located nearest to the motor baseplate 2 7j in order to effect rotation of the said nut element 4- . A hole 11 which is larger than the maximum cross-section of the " .shaft 9 extends through the motor baseplate and enables the shaft 9 to rotate without being obstructedby the baseplate 7.iShaft passageways 12 am . 13 at the nut elements 4 and 4 ' also allow shafts 8, 8* , 9 received therein to move freely " . The nut elements 4—4-^ may consist of two halves 4- and 4- respectively which can be connected to each other . by connecting means which may consist of threads 14- and15 respectively, and after being connected together they can "De locked by means of adhesive.for exaπple. In the connected sta an intervening space 16 is formed between the two half- "BUREA OMPI Λ Ώ nuts 4- , 4- , between a flange 7 or 18 respectively pro¬ jecting in the radial direction from each half-nut. The said intervening space 16 is designed to receive a part 19, preferably an annular flange 19 extending radially relative to the axial direction of the tube on an associ- 2 ated tube 3-3 which can be connected thereto. Expedient¬ ly, friction-reducing elements 20 and 21 respectively are provided on either planar face of the said flange 19, for example a suitable coating of some kind, so that a sliding bearing area is formed on either side of the said flange 2 19 and facilitates rotary movement between the tubes 3-3 2 and the nut elements 4—4- connected to them. 2 In order that the tubes 3-3 do not rotate relative to each other, the tubes which are connected to an ad * join- ing tube are connected via a rotation-preventing device; however, this is not shown on the drawings. This may con¬ sist for example of a longitudinal keyway on one of the tubes with a spline mounted on the other tube and able to enter into the said keyway and be displaced along it 2 when the associated nut element 4—4- is rotated. The functioning of the above-described arrangement, which can be used for transmitting movement from a rotary drive source to a desired point located at a distance from the said drive source to produce linear movement, like a 2 jack, is as follows: When the nut element 4- is screwed upwards in the direction of the arrow 22, for example, under the effect of the shaft 9 and co-action with the 2 passage 10, the associated tube 3 is positioned with the 2 nut element 4-' on the said nut element 4- . As the drive 2 is continued, the nut elements 4—4- are screwed in the direction of the arrow 22, causing a rising movement to occur with the next tube, etc., so that a stroke-length of substantially four times the structural length is poss¬ ible with the example shown. Based on the drawing, the said stroke-length amounts to approximately 4-70 mm, with an overall structural height of only 14-0 mm. If it is desired to increase the stroke-length, all .the tubes are made the same overall length, thus increasing the struc¬ tural height by 30 mm. If it is desired to have a com¬ pletely level state for the structural height then each tube is reduced in stroke-length by the thickness (10 mm) of the nut lying below, which gives a stroke-length of approximately 560 mm. Figure 3 shows an influencing arrangement 101 wherein the influencing members are formed only of tubes 102, 103 . 104-, etc. Threaded elements 105 in the form of trape¬ zoidal threads e.g., arranged over the outer circumference of an inner tube 102, can co-act with a corresponding com¬ plementary threaded element 106 disposed over the inter¬ nal periphery of an adjoining surrounding tube 103• » so that when one 102 of the tubes is rotated under the effect of a drive shaft 107 which projects in through a hole 108 in the end wall 109 on a fixed outer tube 104- and which co- acts with an inner non-circular shaft 110 which is con¬ nected via a ring 111 to the said inner tube 102, the two tubes 102, 103 move relative to each other. When the tube 102 reaches a substantially fully-extended position de¬ fined by a stop arrangement, the tube 103 is screwed out by co-action between an outer thread element 112 and an inner thread element 113 on the tubes 103 . 104- respective- ly, in the direction away from the said fixed tube 04-. The displacement movement of the tubes 102, 103 is re¬ versed when the drive direction of the shaft 107 is re¬ versed. The invention is not limited to the -embodiment ex- a ples described above and shown on the drawings, but can be modified within the framework of the following Patent Claims without exceeding the concept of the invention. _OMPI

Claims: • P a t e n t C l a i m s 1. An influencing arrangement (1; 101) with"tele¬ scopically variable length, comprising an influencing mem¬ ber ( 9 ; 107 ) which can be actuated by a drive shaft an moved i its longitudinal direction, characterised in that a plur- ality of influencing members (2, 2', 2 ; 102, 103) which are disposed coaxially relative to each other and have an outer and/or inner threaded element, are connected to¬ gether via a plurality of rotatable, telescopically con¬ nected drive shaft devices (8, S 1 ; 110) with a non- circular cross-section part, so that rotation of a main rotary drive shaft (9; 107) in one direction of rotation causes the influencing members (2, 2', 2 ; 102, 103) to be screwed out in order to. extend the arrangement, and rotation of the said main rotary drive shaft in the oppo- site direction of rotation causes the said influencing members to be screwed in and closed up one inside the other. 2. An arrangement according to Patent Claim 1, characterised in that the said influencing members (2, 2', 2 2 ; 102, 103) consist of tubes (3, 3', 3 2 ; 102, 103) with 2 thread elements (5, 6', 6 ; 105, 106, 112) extending over their casing surfaces, these tubes being designed to be screwed into one another. 3. An arrangement according to Patent Claim 2, characterised in that the respective tubes (3, 3 ) are connected together by nut elements (4-, 4-', 4- ) which can rotate relative to the said tubes and have thread elements (5) over their circumference adapted to inwardly facing thread elements (6 1 , 6 , 6 Ω ) on an adjoining radially σff- set tube. 4-. An arrangement according to Patent Claim 3, 2 characterised in that the nut elements (4—4- ) are made in two parts and in the intervening space (16) which is formed between two radial flanges (17, 18) .held spaced apart from one another the nut elements accommodate a part (19) of a tube so that it can move relative to the nut element. 5. An arrangement according to Patent Claim 4-, characterised in that there are friction-reducing means (20, 21) in the intervening space (16) on either side of the said part -(19) of the tube. 6. An arrangement according to either of Patent Claims 4—5, characterised in that the two nut element parts ( * 4-A, 4-B) have connecting means (14-, 15), preferably threads (14-, 15) which can co-act with each other, b means of which the parts (4- A, 4-B) can be connected to¬ gether, for securing subsequently. 7- - arrangement according to any of Patent Claims 4—6, characterised in that the said part (19) of the tube is formed by an annular flange (19) extending radially relative to the axial direction of the tube. 8. An arrangement according to any of the preceding Patent Claims 2-7, characterised in that two connected adjoining tubes (3-3 n ) are connected together via a rotation-preventing device co-acting with the respective tubes, preferably a projecting spline connected to one of the tubes and able to be received in a longitudinal key- way on the other tube, in order to prevent a further sur ¬ rounding tube from being caused to rotate under the effect of the said two inner tubes. 9. An arrangement according to either of Patent Claims 1-2, characterised in that a threaded element (105) disposed over the outer circumference of an inner tube (102) is designed to co-act with a threaded element (106) disposed over the inner circumference of an adjoining surrounding tube (103) so that when one tube (102) is rotated both the tubes (102, 103) move relative to each other, and are screwed out relative to a further sur¬ rounding tube (104-) in the fully-extended state. gUREΛtT _ OMPI 10. An arrangement according to any of . the preceding Patent Claims, characterised in that the crive shaft de¬ vices are formed by four-sided tubes (8, 8 f , 9- 1 ; 107, 110) received one inside the other and preferably connected non-rotatably to an associated influencing element (3 , 7; 104-, 109), and that the main rotary drive shaft (9; 107) is connected non-rotatably to one of the said four-sided tubes. I J U EΛT OMPI

Inventors: SVENSSON INGEMAR, SVENSSON, INGEMAR
Applicants: SVENSSON INGEMAR, SVENSSON, INGEMAR
Application year: 1984
Main classification: F16H25
IPC codes: B66F3, F16H25