Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Patent
1997-04-17
1999-07-27
Marmor, Charles A.
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
74458, 74459, 297330, 2973441, F16H 2520, A47C 2004
Patent
active
059271442
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a drive for adjusting parts of seating and reclining furniture, preferably for adjustable chairs, consisting of a basic housing for accepting a mechanism for driving a spindle fixed in position in the basic housing in a rotating manner and surrounded by a guide section connected to the basic housing, and a motor flanged to the side of the basic housing and connected to the mechanism, an accepting device for connection to an adjuster for adjusting the movable part of the seating or reclining furniture being provided on the basic housing and in which the spindle drives a nut which moves in the longitudinal direction in a non-twisting manner within the guide section, the nut being connected to the adjuster.
A drive of this kind is known from DE-GM 89 03 603, for example, in which a mechanism, consisting of a gearwheel connected to a spindle and a worm engaging the gearwheel, is arranged inside a housing. The worm is driven by an electric motor fastened to the side of the housing. A nut, on which a lifting tube capable of movement in the lifting tube accepting device is fastened, is guided in a non-twisting manner on the spindle within a lifting tube accepting device projecting from the housing. The lifting tube can be easily adjusted if this drive is fixed in pivoting fashion via an accepting device located on the housing and the lifting tube is coupled with an adjuster for slatted bases.
This kind of drive, also referred to as an individual drive, has the particular disadvantage that its total length is determined by the necessary minimum length for guiding the lifting tube in the lifting tube accepting device plus the lifting path of the lifting tube. This minimum length is necessary in order to reliably prevent the lifting tube from buckling over long travel paths. This means that it is necessary to simultaneously lengthen the lifting tube accepting device in the event of increasing the stroke length of the lifting tube. This makes it necessary to manufacture housings with different lengths of lifting tube accepting device within certain limits, rendering the manufacture of the drives considerably more expensive.
Furthermore, this kind of drive cannot be used unobtrusively in constricted spaces, as is the case with adjustable seating and reclining furniture.
Moreover, an adjuster is known from DE 37 34 922 A1 which is designed to be adjustable in the longitudinal direction on a special section tube by means of a nut/spindle mechanism. The nut part located within the special section tube is designed in one piece, including a sliding shell which partially surrounds the special section tube and strips guided in grooves in the special section tube. A web which reaches through a groove in the special section tube and connects these parts is provided between the nut and the sliding shell to this end. As the sliding shell only partially surrounds the special section tube, an additional sliding support is provided, the sliding shell and sliding support being screwed together.
The host of individual parts means that assembly involves a considerable effort, simultaneously resulting in increased costs.
The task of the invention is thus to create a compact drive for parts of seating and reclining furniture, preferably for adjustable chairs, in which the length of the housing is independent of the stroke length of the drive to be realised, and which is inexpensive to manufacture and easy to assemble.
In a drive of the kind mentioned at the start, this task is solved in that the adjuster is designed as a slider surrounding the outside of the guide sections in a form-fitting manner, the guide section being designed in two parts and a slit being kept free between the two parts of the guide section, and in that the slider is connected to the nut by means of longitudinal fins which reach through the slit.
This solution creates a particularly compact drive of simple design for adjustable chairs, its total length being determined by the desired stroke length of the adjuster plus the length of the basi
REFERENCES:
patent: 4440372 (1984-04-01), Wisniewski
patent: 4966045 (1990-10-01), Harney
patent: 5311788 (1994-05-01), Kasuga
patent: 5467957 (1995-11-01), Gauger
patent: 5505104 (1996-04-01), Takei
Fenstermacher David
Marmor Charles A.
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