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Linear actuator

A technology of linear actuators and electric motors, which can be used in transmission devices, medical science, hospital beds, etc., can solve the problem of long falling time, achieve the effect of reducing the falling time, increasing the falling speed, and maintaining the damping effect

Active Publication Date: 2020-09-25
LINAK AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this configuration is that once the quick release is activated, the rotary damper is not active, so the drop time becomes relatively long

Method used

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  • Linear actuator
  • Linear actuator
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Experimental program
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Embodiment Construction

[0042] in the attached picture figure 1 The hospital bed 1 shown in includes a lower frame 2 and an upper frame 4 equipped with drive wheels 3 . An adjustable load bearing surface for a mattress is mounted to the upper frame 4 . Said load-bearing surface comprises a backrest portion 6, an articulated leg-rest portion 7 and a fixed intermediate portion 8 between them. The backrest and leg rest sections 6, 7 can be adjusted with linear actuators 9, 10, respectively, so that the load-bearing surface can assume various contours, as indicated by arrow 5. The upper frame 4 is connected to the lower frame 2 at each end by lever mechanisms 11 , 12 . The upper frame 4 can be raised and lowered by a pair of actuators 13 , 14 connected to the lever mechanisms 11 , 12 . The actuators 9, 10; 13, 14 are connected to a control box 15 containing a power supply for connection to the mains, a rechargeable battery pack and a controller. An operating unit such as a handle control 16 , a fixed...

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PUM

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Abstract

Linear actuator comprising a reversible electric motor (20), a transmission (21), a non- self-locking spindle (22), where the reversible electric motor (20) through the transmission (21) drives the non-self-locking spindle (22) and a spindle nut (23) on the spindle (22). The actuator further comprises an adjustment element (24) secured against rotation and where the adjustment element (24) can bemoved axially, as it is connected to or integrated with the spindle nut (23) on the spindle (22). Further, that actuator comprises position means for determining the position of the spindle nut (23),brake means for controlling the speed of the spindle nut (23) under the external load. Between the brake means and the spindle there is a coupling in connection with the position means for determiningthe position of the spindle nut (23). The coupling engages the brake means to the spindle or disengages the brake means from the spindle, when the spindle nut (23) is in a predetermined position on the spindle (22).

Description

technical field [0001] The invention relates to a linear actuator of the type described in the preamble of claim 1 . Background technique [0002] In hospital beds and nursing beds, the load-bearing surface is divided into a backrest part and a leg rest part and a usually fixed middle part. The backrest and leg rest sections are respectively adjustable about a horizontal axis by means of linear actuators, see eg EP 0 498 111 A2 J to Nesbit Evans & Company Ltd. [0003] In some cases, such as in the case of cardiac arrest, it is crucial to be able to lower the backrest part instantaneously from a raised position to a horizontal position. The speed of the linear actuator is too low to instantaneously lower the backrest portion to a horizontal position. In order to solve said problems, linear actuators with so-called quick releases have been developed, which decouple the non-self-locking type of the main shaft itself from the motor or of the transmission which is drivingly co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H25/20F16H25/24A61G7/018
CPCF16H25/2015F16H25/2454F16H2025/2071F16H2025/209A61G7/018
Inventor A·孟格尔
Owner LINAK AS