Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Patent
1984-12-21
1987-03-24
Staab, Lawrence J.
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
744248R, F16H 2520
Patent
active
046515810
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to 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 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 arrangement of the above-mentioned type which is essentially characterized 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 connected together via a plurality of rotatable, telescopically connected drive shaft devices with a non-circular cross-sectional part, so that rotation of the main rotary drive shaft in one direction of rotation causes the said influencing 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 preferred embodiment examples, with reference to the accompanying drawings, on which
FIG. 1 is a schematic longitudinal section through an influencing arrangement constructed according to the invention shown in the retracted state,
FIG. 2 shows in detail part of an influencing member appertaining to the arrangement, and
FIG. 3 shows a further embodiment of an influencing arrangement constructed according to the invention, shown in partially extended state.
An influencing arrangement constructed according to the invention, which is shown in FIGS. 1 and 2 and which is designated by the numeral 1, comprises a plurality of mutually coaxial influencing members 2, 2', 2.sup.2, etc., which preferably consist of a tube 3, 3', 3.sup.2 etc. with a nut element 4, 4', 4.sup.2 etc. connected rotatably to one of their ends 3A, 3'A, 3.sup.2 A, etc., for example. The nut elements 4, 4', 4.sup.2 have outer threaded elements 5 along their respective outer casing surface 4A, 4'A, 4.sup.2 A, while a number of the tubes 2', 2.sup.2 have an internal threaded element 6', 6.sup.2 along their inner casing surface 4'B, 4.sup.2 B. A further tube 3.sup.n, which has only an inner thread element 6.sup.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 a four-sided tube or having some other irregular circumferential shape, are connected non-rotatably to each other or to a main rotary drive shaft 9. Expediently, the majority of the said drive shaft devices 8 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 adapted to the shape of the shaft 9 at the nut element 4.sup.2 which is located nearest to the motor baseplate 7, in order to effect rotation of the said nut element 4.sup.2. A hole 11 which is larger than the maximum cross-section of the shaft 9 extends through the motor baseplate 7 and enables the shaft 9 to rotate without being obstructed by the baseplate 7. Shaft passageways 12 and 13 at the nut elements 4 and 4' also allow shafts 8, 8', 9 received therein to move freely.
The nut elements 4-4.sup.2 may consist of two halves 4.sup.A and 4.sup.B respectively which can be connected to each other by connecting means which may consist of threads 14 and 15 respectively, and after being connected together they can be locked by means of adhesive for example. In the connected state by intervening space 16 is formed between the two half-nuts 4.sup.A, 4.sup.B, between a flange 17 or 18 respectively projecting 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 associated tub
REFERENCES:
patent: 1279346 (1918-09-01), Hultgren et al.
patent: 1705232 (1929-03-01), Brantingson
patent: 1912230 (1933-05-01), Statz
patent: 3404580 (1968-10-01), Valenti
patent: 3404581 (1968-10-01), Kraus
patent: 3422696 (1969-01-01), Valenti
patent: 3592070 (1971-07-01), Hammond
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