US 12,133,483 B2
Walk-behind self-propelled working machine
Yufei Ren, Nanjing (CN); Yang Li, Nanjing (CN); Ronggen Zhu, Nanjing (CN); Haishen Xu, Nanjing (CN); and Rui Zhang, Nanjing (CN)
Assigned to Nanjing Chervon Industry Co., Ltd., Nanjing (CN)
Filed by Nanjing Chervon Industry Co., Ltd., Nanjing (CN)
Filed on Jan. 14, 2022, as Appl. No. 17/576,567.
Application 17/576,567 is a continuation of application No. PCT/CN2020/104524, filed on Jul. 24, 2020.
Claims priority of application No. 201910674384.8 (CN), filed on Jul. 25, 2019; and application No. 201911001974.0 (CN), filed on Oct. 21, 2019.
Prior Publication US 2022/0132732 A1, May 5, 2022
Int. Cl. A01D 34/68 (2006.01); A01D 34/78 (2006.01); A01D 101/00 (2006.01)
CPC A01D 34/6806 (2013.01) [A01D 34/78 (2013.01); A01D 2034/6843 (2013.01); A01D 2101/00 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A walk-behind self-propelled working machine, comprising:
a main body comprising a moving assembly and a drive motor configured to drive the moving assembly;
an operation switch connected to the drive motor; and
a handle device connected to the main body;
wherein the handle device comprises:
an operation member comprising a gripping portion for a user to hold;
a connecting rod connected to the main body; and
a sensing device configured to sense a thrust that is applied to the handle device to drive the walk-behind self-propelled working machine;
wherein the sensing device further comprises:
a pressure sensor disposed between the operation member and the connecting rod;
a pressing member arranged to apply a force along a preset straight line to the pressure sensor to drive the pressure sensor to deform when the gripping portion receives the thrust; and
a preload element configured to apply a preload force to the pressure sensor; and
wherein a ratio of a component of the thrust received by the gripping portion along the preset straight line to a deformation amount of the pressure sensor along the preset straight line is greater than or equal to 40 N/mm and the operation switch is capable of generating a control signal according to the thrust sensed by the pressure sensor to control the drive motor.