Tie tamper
AssigneesNippon Kokuyu Tetsudo, Kabushiki Kaisha Shibaura Seisakusho
InventorsKazuhide Yamazaki, Masaomi Morisawa, Maki Nakajima
Life of this patent
Estimating the term…
Abstract
The handle of a tie tamper is connected to its vibration generating motor, to which a beater is rigidly fixed to be vibrated thereby, by a combination of a Neidhart damper fixed to one end of the handle, a shackle-link pair fixed at one end to the square shaft of the damper, and an arcuate leaf spring pin-connected at its one end to the link pair and at its other end to the motor and by a two-bar linkage connected at its two ends via Neidhart dampers respectively to an intermediate part of the handle and to the motor, and a balance weight is provided at the pin joint between the two links of the two-bar linkage. This construction greatly reduces the vibration transmitted from the motor to the handle.
Claims3
A tie tamper comprising:
- a motor adapted to generate vibration as output;
- a beater designed to be thrust at a distal end thereof into ballast gravel and rigidly fixed at its proximal end to the motor to be vibrated thereby;
- a handle to be grasped by an operator of the tie tamper;
- a link mechanism connecting an intermediate part of the handle to the motor and comprising
- a first Neidhart damper secured to the motor and having a non-cylindrical shaft disposed therein,
- a second Neidhart damper secured to said intermediate part of the handle and having a non-cylindrical shaft disposed therein,
- a first link fixed at one end thereof to the shaft of the first Neidhart damper, and
- a second link fixed at one end thereof to the shaft of the second Neidhart damper and pin-connected at the other end thereof to the other end of the first link,
- the first and second links always forming therebetween an angle less than 180 degrees;
- a support mechanism connecting one end of the handle to the motor and comprising
- a support spring connected at one end thereof to a part of the motor,
- a third Neidhart damper secured to said one end of the handle and having a non-cylindrical shaft disposed therein, and
- a third link fixed at one end thereof to the non-cylindrical shaft and connected at the other end thereof to the other end of the support spring;
- and
- a balance weight fixed to said other end of the second link.
Dependencies are inferred from the claim text.