Self-evacuating vacuum cleaner

• US 5,918,344 A
• Filed: 10/08/1996
• Issued: 07/06/1999
• Est. Priority Date: 07/12/1996
• Status: Expired due to Term

• Current Assignee: Shop-Vac Corporation (Hangzhou Great Star Industrial Company Limited)
• Original Assignee: Shop-Vac Corporation (Hangzhou Great Star Industrial Company Limited)
• Inventors: Seasholtz, Craig A., Crevling, Robert L. Jr.
• Primary Examiner(s): Moore, Chris K.
• Application Number:
  US08/727,318
• Time in Patent Office: 1,001 Days
• Field of Search: 15/339, 15/353, 96/406
• US Class Current: 15/339
• CPC Class Codes: A47L 11/30 by suction
• CPC Class Codes: A47L 11/4011 Regulation of the cleaning machine by electric means; Control systems and remote control systems therefor
• CPC Class Codes: A47L 11/4019 Fill level sensors; Security means to prevent overflow, e.g. float valves
• CPC Class Codes: A47L 11/4025 Means for emptying
• CPC Class Codes: A47L 11/4027 Filtering or separating contaminants or debris
• CPC Class Codes: A47L 11/4044 Vacuuming or pick-up tools; Squeegees
• CPC Class Codes: A47L 11/4072 Arrangement of castors or wheels
• CPC Class Codes: A47L 11/4077 Skirts or splash guards
• CPC Class Codes: A47L 7/0028 Security means, e.g. float valves or level switches for preventing overflow
• CPC Class Codes: A47L 7/0038 with means for emptying the tanks
• CPC Class Codes: A47L 7/0042 Gaskets; Sealing means
• CPC Class Codes: A61L 2/14 Plasma, i.e. ionised gases
• CPC Class Codes: A61L 2/20 Gaseous substances, e.g. vapours
• CPC Class Codes: F16K 1/526 for limiting the maximum flow rate, using a second valve
• CPC Class Codes: Y10S 15/10 Handles, reels and switches
• CPC Class Codes: Y10T 137/7306 Electrical characteristic sensing

Abstract

A vacuum cleaner has an electric motor driving an air impeller for creating suction and a pump impeller which is located in the tank and draws liquid material from the bottom of the tank and expels it from the tank. The vacuum cleaner may have an electrical or mechanical shut-off apparatus which turns off the electric motor if the water level in the tank is too high. The shut-off switch may be bypassed by a user to allow the motor to continue driving the pump impeller to remove liquid from the tank.

Claims

1. A wet/dry vacuum cleaner for vacuuming liquid or debris, comprising:

a tank for collecting material;

an air impeller for creating low pressure in the tank to draw material into the tank;

a motor driving the air impeller;

a switch having a first position in which power is provided to the motor and a second position in which power to the motor is interrupted;

a user-operated actuator mechanism mechanically linked to the switch and capable of moving the switch to the first position or the second position; and

a float mechanically linked to the switch and capable of moving the switch from the first position to the second position.

2. The wet/dry vacuum cleaner of claim 1, further comprising a toggle member which engages said switch to move said switch to the first or second position.

3. The wet/dry vacuum cleaner of claim 2, further including a float transmission rod disposed between the toggle member and the float.

4. The wet/dry vacuum cleaner of claim 2, wherein the toggle member includes a locking brace having a ramp portion and a locking portion inclined with respect to the ramp portion.

5. The wet/dry vacuum cleaner of claim 4, wherein the switch includes an actuator which is engageable by the locking brace and is latched by the locking portion.

6. The wet/dry vacuum cleaner of claim 2, wherein the actuator mechanism includes a female coupling member having an upper flange member and a lower flange member and further defining a boss slot, and wherein the toggle member includes a sidewall and a boss connected to the sidewall and extending outward from the toggle member and into the boss slot and neither the upper nor lower lip of the female coupling member engages the boss when the actuator mechanism is centered.

7. The wet/dry vacuum cleaner of claim 1, wherein the actuator mechanism includes an upper leaf spring, a lower leaf spring, a leaf connection member spanning between and connecting the upper and lower leaf springs and an actuator stem attached to the leaf connection member wherein the upper and lower leaf springs center the actuator stem in an actuator slot.