Lagged type solenoid
AssigneeKabushiki Kaisha Nippon Automation
InventorEtsushi Hida
Life of this patent
Estimating the term…
Abstract
A lagged type solenoid capable of carrying out the plunger advancing operation at a speed lower than the plunger retreating operation. For this purpose, the solenoid includes a plunger lagging mechanism, which includes an air discharge passage for discharging air in a plunger moving space to an ambient atmosphere during the plunger advancing operation and an air supply passage for supplying air from the ambient atmosphere to the plunger moving space during the plunger retreating operation which is formed into a sectional area larger than the air discharge passage. The air supply passage is closed by a check valve during the plunger advancing operation. Thus, the plunger advancing operation takes place at a speed lower than the plunger retreating operation.
Claims24
A lagged type solenoid comprising:
- a frame formed into a substantially cylindrical shape and opened at one end thereof;
- a coil bobbin formed into a substantially cylindrical shape and provided therein with an axially extending through-hole, said coil bobbin having a magnetic coil wound on its outer periphery and being arranged on an inner peripheral surface of said frame;
- a core arranged in a bottom of said frame to define a plunger moving space in cooperation with said through-hole of said coil bobbin;
- a plunger fitted in said plunger moving space so as to be reciprocated in an axial direction thereof and advanced in said plunger moving space due to excitation of said magnetic coil;
- and
- a plunger lagging mechanism for carrying out one of the plunger advancing operation and plunger retreating operation at a low speed in said plunger moving space,
- said plunger lagging mechanism comprising:
- at least one air discharge passage for discharging air in said plunger moving space from said space therethrough to an ambient atmosphere;
- at least one air supply passage for supplying air from the ambient atmosphere therethrough to said plunger moving space;
- one of said air discharge passage and air supply passage being formed into a sectional area larger than that of the other of said air discharge passage and air supply passage;
- the sectional area of said one of said air discharge passage and air supply passage being small sufficiently to flow air between said plunger moving space and the ambient atmosphere little by little;
- and
- selective shut-off means for closing the other of said air discharge passage and air supply passage during one of said plunger advancing operation and plunger retreating operation.
A lagged type solenoid comprising:
- a frame formed into a substantially cylindrical shape and opened at one end thereof;
- a coil bobbin formed into a substantially cylindrical shape and provided therein with an axially extending through-hole, said coil bobbin having a magnetic coil wound on its outer periphery and being arranged on an inner peripheral surface of said frame;
- a core arranged in a bottom of said frame to define a plunger moving space in cooperation with said through-hole of said coil bobbin;
- a plunger fitted in said plunger moving space so as to be reciprocated in an axial direction thereof and advanced in said plunger moving space due to excitation of said magnetic coil;
- and
- a plunger lagging mechanism for carrying out one of the plunger advancing operation and plunger retracting operation at a low speed in said plunger moving space, said plunger lagging mechanism comprising:
- an air discharge passage for discharging air in said plunger moving space from said space therethrough to an ambient atmosphere;
- an air supply passage for supplying air from the ambient atmosphere therethrough to said plunger moving space;
- and
- a plunger braking mechanism for braking said plunger during one of said plunger advancing operation and plunger retreating operation to render movement of said plunger slow.
Dependencies are inferred from the claim text.