Safety guard for hand trucks or lift gates

• US 5,465,807 A
• Filed: 06/27/1994
• Issued: 11/14/1995
• Est. Priority Date: 06/27/1994
• Status: Expired due to Fees

• Current Assignee: Harold Josephs
• Original Assignee: Harold Josephs
• Inventors: Josephs, Harold
• Primary Examiner(s): Focarino, Margaret A.
• Assistant Examiner(s): ELLIS, CHRISTOPHER P
• Application Number:
  US08/266,726
• Time in Patent Office: 505 Days
• Field of Search: 180/274, 180/276, 180/277, 180/278, 340/436, 340/437, 293/4, 200/61.44
• US Class Current: 180/274
• CPC Class Codes: A01D 2101/00 Lawn-mowers
• CPC Class Codes: A01D 75/20 Devices for protecting men or animals
• CPC Class Codes: A61G 3/02 Loading or unloading personal conveyances; Facilitating access of patients or disabled persons to, or exit from, vehicles
• CPC Class Codes: B60K 28/10 responsive to conditions relating to the vehicle
• CPC Class Codes: B60K 28/14 responsive to accident or emergency, e.g. deceleration, tilt of vehicle
• CPC Class Codes: B60P 1/44 having a loading platform thereon raising the load to the level of the load-transporting element vehicles with special provisions for invalids comprising means for loading or unloading invalid conveyances A61G3/02
• CPC Class Codes: B60P 1/4478 Safety stops, switches
• CPC Class Codes: B60R 19/483 with obstacle sensors of electric or electronic type
• CPC Class Codes: B60R 21/34 Protecting non-occupants of a vehicle, e.g. pedestrians B60R19/02 takes precedence
• CPC Class Codes: B60R 3/02 Retractable steps or ladders, e.g. movable under shock B60R3/005 takes precedence
• CPC Class Codes: B60T 7/22 initiated by contact of vehicle, e.g. bumper, with an external object, e.g. another vehicle , or by means of contactless obstacle detectors mounted on the vehicle
• CPC Class Codes: B62B 5/063 for low-lift hand trucks
• CPC Class Codes: B62D 51/002 comprising safety arrangements safety devices for vehicle propulsion unit control B60K28/00
• CPC Class Codes: B66F 17/003 for fork-lift trucks
• CPC Class Codes: Y10S 414/134 Handicapped person handling

Abstract

A safety guard uses a strip switch to prevent injury at pinch points on either lift gates or pedestrian-operated industrial trucks. A strip switch is provided at the pinch point between the lift gate and the truck bed or vehicle body to stop or reverse operation of the lift gate when contacted by body parts or items improperly loaded on the lift gate. A strip switch may also be located adjacent the portions of a pedestrian-operated lift truck. The strip switch is disposed located about a portion of the perimeter of the pedestrian-operated lift truck adjacent the operator. Upon contacting the strip switch, the pedestrian-operated lift truck may be stopped or reversed to permit the operator to free his foot from the potential pinch point where injury can occur. Another approach to minimizing injury from pedestrian-operated lift trucks is to provide a semi-rigid guard attached to the platform body of the pedestrian-operated lift truck which reduces the size of the pinch point and minimizes the hazard of the pedestrian-operated lift truck overrunning an operator'"'"'s foot.

Claims

1. A pedestrian-operated industrial lift truck adapted to be operated on a floor comprising:

a platform body supported over the floor on a plurality of wheels, said platform body and said floor defining a gap therebetween;

a driving motor supported by the platform body and operatively connected in a driving relationship to at least one of said wheels;

a switch electrically connected to the driving motor, said switch being actuable to selectively stop operation of the driving motor; and

an actuator coupled to said switch and mounted under a floor facing surface of the platform body, said actuator extending from the floor facing surface towards the floor for engaging a foreign object in the gad between said platform body and said floor whereby said actuator actuates said switch when said platform body overruns foreign objects on the floor which are of sufficient height to contact the actuator.

2. The pedestrian-operated industrial lift truck of claim 1 wherein the actuator is a strip switch spanning the periphery of the platform body.

3. The pedestrian-operated industrial lift truck of claim 1 wherein the actuator is a light source and a photocell, said light source providing a light beam spanning the platform body so that the foreign objects on the floor which are of sufficient height interrupt reception of the light beam by said photocell, whereby said actuator actuates said switch.

4. The pedestrian-operated industrial lift truck of claim 1 wherein the actuator is an infrared proximity sensor.

5. The pedestrian-operated industrial lift truck of claim 1 wherein the switch is connected to a circuit which reverses operation of the driving motor after stopping operation of the driving motor upon actuation of the switch to automatically move clear of the foreign objects on the floor.