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Linear actuator device

An actuator device, technology of linear actuators, applied in the direction of sofas, other seating furniture, beds, etc.

Inactive Publication Date: 2009-03-18
LINAK AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this contradicts the minimum height requirement for actuator mounting

Method used

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  • Linear actuator device
  • Linear actuator device
  • Linear actuator device

Examples

Experimental program
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Embodiment Construction

[0016] attached figure 1 Shown is a slatted bed, eg used in a hospital, comprising a base frame 1 into which an upper body part 2 and hinged leg parts 3 are housed. A transverse shaft 4 carrying a short arm 5 is incorporated in the frame for handling the upper body part 2 . Each rod 23 connected to the upper body part 2 is mounted on each end of the pivot shaft 4 . And in a similar manner, for the leg part 3 it has a pivot 6 carrying a short arm 7 for operating the leg part 3 . Likewise, there are rods 24 each mounted to the end of the shaft 6 and connected to the leg part 3 .

[0017] The movement of the upper body part 2 and the leg part 3 depends on figure 2 The double-ended actuator shown in . The actuator device comprises a housing 8 with sliding end caps 9 at the ends, said end caps allowing access to a transverse shaft opening 10 which forms a bushing. A drive is provided, mounted substantially perpendicular to the main housing 8 , functionally connected to the sh...

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PUM

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Abstract

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.

Description

technical field [0001] The present invention relates to a linear actuator arrangement as described in the preamble of claim 1 . Background technique [0002] Linear actuator arrangements of this type are used in beds and chairs with at least one adjustable part pivotally mounted into the frame. The part is raised and lowered by means of one or two rods mounted on the pivot axis. On said pivot axis, an arm engages a spindle nut forming part of the actuator. The actuator is in the form of an embodiment with a separate drive unit in the connecting housing at each end, or another embodiment of the actuator with only one drive unit. The first of these embodiments is known, for example, from EP0372032 by Dewert, and the second from WO2005 / 112709A1 by Dewert. [0003] Typically, the spindle nut is designed from plastics material and formed as a quadrangular sliding member, with an arm abutting its end face on the pivot axis. Typically, the arm is made of metal and the spindle n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A47C20/08
CPCA47C20/041A47C20/08Y10T74/18576
Inventor J·J·尼尔森
Owner LINAK AS