Ladder with warning gate

• US 5,080,192 A
• Filed: 12/05/1990
• Issued: 01/14/1992
• Est. Priority Date: 12/05/1990
• Status: Expired due to Term

• Current Assignee: Material Control Incorporated
• Original Assignee: Material Control Incorporated
• Inventors: Kerr, James F.
• Primary Examiner(s): MACHADO, REINALDO
• Application Number:
  US07/622,738
• Time in Patent Office: 405 Days
• Field of Search: 182/17, 182/15, 182/129, 182/18, 182/106, 182/77, 182/230
• US Class Current: 182/17
• CPC Class Codes: E06C 1/397 characterised by having wheels, rollers, or runners
• CPC Class Codes: E06C 7/006 Devices for preventing access
• CPC Class Codes: E06C 7/182 situated at the top of the ladder

Abstract

A ladder is disclosed which includes gate members to block access to the ladder. The gate members preferably include a warning against unauthorized use of the ladder. The ladder may be mounted on wheels such that it may be transportable, for uses in environments such as warehouses. Since these environments may be exposed to customer use, the warnings may prevent unauthorized use of the ladder by customers.

Claims

1. A ladder comprising:

a) a frame having a first step at a first vertical position and a second step at a second vertical position higher than said first vertical position, said first and second steps extending between lateral ends of said frame;

b) a gate member extending laterally inwardly from at least one lateral end to block access to said ladder, said gate member being pivotally attached to a first frame portion of said frame at said one lateral end; and

c) said gate member is normally biased to extend generally parallel to said steps.

2. A ladder as recited in claim 1, wherein said gate member extends more than halfway across the lateral extent of said ladder.

3. A ladder as recited in claim 2, wherein said gate member extends from said first frame portion at one lateral end of said ladder across the entire lateral extent of said frame and abuts a second frame portion at the opposed lateral end of the frame.

4. A ladder as recited in claim 1, wherein said gate member includes a warning.

5. A ladder as recited in claim 1, wherein each lateral end includes a frame portion receiving a separate gate member, and wherein each of said separate gate members extend laterally inwardly from respective ends.

6. A ladder as recited in claim 1, wherein said ladder has wheels fixed at a vertical position less than said second vertical position, but off of the ground.

7. A ladder as recited in claim 6, wherein there are wheels mounted at each lateral end of said ladder.

8. A ladder as recited in claim 7, wherein said wheels are mounted at a vertical position off of the ground that is greater than a radius of said wheel, but less than a diameter of said wheel.

9. A ladder as recited in claim 6, wherein said gate member includes a warning against use of the ladder by unauthorized persons.

10. A ladder as recited in claim 9, wherein a separate gate member extends laterally inwardly from each lateral end and each of said gate members include warnings.

11. A ladder as recited in claim 1, wherein said gate member can be pivoted both inwardly and outwardly from said normal position to provide access to the ladder, but is biased back to its normal position.

12. A ladder comprising:

a) a frame having a first step at a first vertical position and a second step at a second vertical position higher than said first vertical position, said first and second steps extending between lateral ends of said frame;

b) a gate member extending laterally inwardly from at least one lateral end to block access to said ladder, said gate member being pivotally attached to a first frame portion of said frame at said one lateral end; and

c) said gate member includes a warning and is mounted at a vertical position selected to approximate waist level for most adult users.

13. A ladder comprising:

a) a frame including a first step mounted at a first vertical position and a second step mounted at a second vertical position above said first vertical position, each of said first and second steps extending between lateral ends of said ladder;

b) a pair of wheels with one wheel mounted at each lateral end of said ladder such that said ladder may be easily transported; and

c) a gate member extending laterally inwardly from at least one lateral end of said ladder, said gate member including a warning, said gate member being normally biased to a position at which it extends generally parallel to said steps.

14. A ladder as recited in claim 13, wherein a gate member extends laterally inwardly from each of said lateral ends, and each of said gate members includes a warning.

15. A ladder as recited in claim 13, wherein said gate member can be pivoted both inwardly and outwardly from said normal position to provide access to the ladder, but is biased back to its normal position.

16. A ladder as recited in claim 13, wherein a single gate member extends across the entire lateral extent of said ladder, and is normally spring biased to a position abutting a frame member on an opposed lateral side.

17. A ladder as recited in claim 13, wherein said gate member is vertically adjustable relative to said frame.