A linear actuator device for pieces of furniture, e.g. beds, is described which include an adjustable section (2, 3) pivotally embedded in a frame (1). The section (2, 3) is raised and lowered by at least one rod (23, 24) mounted on a pivot shaft (4, 6). The actuator comprises a housing (8) with a b
A linear actuator device for pieces of furniture, e.g. beds, is described which include an adjustable section (2, 3) pivotally embedded in a frame (1). The section (2, 3) is raised and lowered by at least one rod (23, 24) mounted on a pivot shaft (4, 6). The actuator comprises a housing (8) with a bushing (10) receiving the pivot shaft (4, 6), and a spindle (14) driven by a low-voltage DC motor (11). The spindle (14) carries a spindle nut (12) fixed against rotation which in one direction of motion operates an arm (5, 7) mounted on the pivot shaft (4, 6) for adjusting the section within the piece of furniture. By designing the arm (5, 7) such that, when it engages the spindle nut (12), it will rest against an area (17) of the nut's end which faces farthest away from the shaft, an expedient moment curve for pivoting the section is obtained, as a large moment occurs at the beginning and the end of the section's movement just when needed. In the initial horizontal position of the section, a large moment is needed, and so is in the end position, when for instance a mattress is folded which requires a large moment. The area, which the end of the arm (5, 7) rests against is expediently equipped with a roller (17) which reduces friction and wear on the spindle nut.
대표청구항▼
1. An item of furniture which comprises: a frame,a first adjustable section pivotally attached to the frame,a first pivot shaft connected to said frame for pivoting said first adjustable section relative to the frame, said first pivot shaft including a first arm,a linear actuator which includes a ho
1. An item of furniture which comprises: a frame,a first adjustable section pivotally attached to the frame,a first pivot shaft connected to said frame for pivoting said first adjustable section relative to the frame, said first pivot shaft including a first arm,a linear actuator which includes a housing with a bushing means for the first pivot shaft, a first spindle, a first electric motor for rotating the first spindle, and a first spindle nut on said first spindle, said first spindle nut being prevented from rotation so as to move along said first spindle based on rotation direction of said first spindle, said first spindle nut having an end face which is generally perpendicular to said first spindle and defines a first notch therein, an upperside, an underside, and a first roller mounted in said first notch next to said underside, said first spindle nut being located in the housing such that the upperside thereof is located closest to the bushing means and the underside thereof farthest from the bushing means, andwherein the first pivot shaft extends in the bushing means of said housing, and said first arm of the first pivot shaft includes a first leg which has a distal end that rests against said first roller, said first roller being contacted on a periphery thereof only by said first leg. 2. The item of furniture as claimed in claim 1, wherein said end face of said first spindle nut includes a second notch therein, wherein a second roller is mounted in said second notch next to said underside, and wherein said first arm includes a second leg which rests against said second roller, said second roller being contacted on a periphery thereof only be said second leg. 3. The item of furniture as claimed in claim 2, including an axle in said end face of said first spindle nut so as to extend across said first and second notches, and wherein said first and second rollers are rotatably mounted on said axle. 4. The item of furniture as claimed in claim 3, wherein said end face of said first spindle nut includes a plurality of grooves in which said axle snap fits. 5. The item of furniture as claimed in claim 4, wherein said axle includes a recess which cooperates with one of said plurality of grooves to prevent lateral displacement of said axle relative to said first spindle nut.
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이 특허에 인용된 특허 (5)
Dewert Eckhart (Dorfstrasse 155 4904 Enger DEX), Adjusting device for a lattice plate equipped with at least a tiltable back part and a tiltable foot part.
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