CA1272169A - Special purpose ladder - Google Patents

Special purpose ladder


Publication number
CA1272169A CA000531180A CA531180A CA1272169A CA 1272169 A CA1272169 A CA 1272169A CA 000531180 A CA000531180 A CA 000531180A CA 531180 A CA531180 A CA 531180A CA 1272169 A CA1272169 A CA 1272169A
Prior art keywords
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
Other languages
French (fr)
Trudy Arthurs
Harold S. Swartz
Original Assignee
Trudy Arthurs
Harold S. Swartz
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Trudy Arthurs, Harold S. Swartz filed Critical Trudy Arthurs
Priority to CA000531180A priority Critical patent/CA1272169A/en
Application granted granted Critical
Publication of CA1272169A publication Critical patent/CA1272169A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current





This ladder is designed to clamp to sign posts for workman safety. Primarily, it consists of a pair of stepped legs with a hinged shelf at the top having a clamp that clamps to a sign post. A second clamp is also provided below and is secured to arms attached to the legs, and a pair of extension rods are provided on the legs for stability of the legs on sloping ground surfaces.


~ ~7;~


This invention relates -to ladders, and more specifically, to a special purpose ladder.
Ladders are known in the art and are basically the same. The ladder in accordance with the present ;nvention, i5 specifically designed for aiding workmen to safely service roadside signs.
The principal object of this invention is to provide a special purpose ladder that a workman can safely employ to service roadside signs that are usually located on sloping terrain.
Another object of this invention is to provide a special purpose ladder, which will include clamp means for securement of the ladder to a sign post, and if the sign post is strong and solidly implanted, the design is such, that the legs of the ladder need not touch the ground while supporting two average weight workmen.
The present invention relates to a special purpose ladder, comprising side members with s-teps and a platform or shelf on the top, and clamp means are provided to engage with a sign post to support the ladder therefrom.
The invention will now be described in greater detail with reference to the accompanying drawings which illustrate a preferred embodimen-t of the invention, and wherein:
- 2 - ,~

FIGURE 1 is a perspec-tive view o-f the present invention;
FIGURE 2 is a view taken along the line 2-2 of Figure 1, and FIGURE 3 is a side view of the invention, illustrating its feet off the ground surface.
With reference to -the drawings, the basic elements of the special purpose ladder in accordance with the present invention include a pair of legs 11 having steps 12 fixedly secured therebetween. A shelf 13 is pivo-tally secured to the tops of legs ll by hinged rods 14 fastened thereto, by fasteners 15. An abrasive 16 is applied to the top of shelf 13, so as -to prevent tools and the lil~e from falling therefrom, and an adjustable clamp 17 is fixedly secured to the rear end of shelf 13, for clamping to a square wooden sign post 18. A pair of brace arms 19 are secured fixedly to a second adjustable clamp 20, providing a secondary means for holding ladder 10 to post 18, and the ends of arms 19 are pivotally secured to legs 11 by fasteners 21. A stop chain 22 is also fastened to one arm 19 and to a ~tep 12 for limiting downward travel of arms 19, clamp 20.
Two sleeve~ 23 are fixedly secured to each side of the bottom portions of legs 11, and an extension rod 24 is slideable in each sleeve 23, for holding ladder 10 firmly on sloping ground 25. The rods 24 are preven-ted from travelling ~7~

too far up~ard, by roll pins 30 -that are irlserted sec1lreLy at lower end of rod 24 and stop against slee-ve 23. Sleeves 23 (2 each side) are mounted vertically on plate 33. Sleeve 27 is mounted hori~on-tally on plate 33. Eye bol-t 31 slides through sleeve 27 and is secured by washer 32 and "T" nut 29. Rod 24 slides freely through sleeves 23 and eye (short sleeve) of eye bolt 3l.
In usel the clamps 17 arid 20 are tightened on -the post l8 after pivoting out the shelf 13 and the rods 19. If the ground 25 is uneven, the rods 24 are adjus-ted in elevation by the set bolts 29.
While various changes may be made in the detail construction, such changes will be within the spirit and scope of the present invention, as defined by the appended claims.

Claims (2)

1. A special purpose ladder. comprising, a pair of legs, a plurality of rungs interconnecting said legs, a shelf fixedly secured at one edge to the top of said legs, a first clamp fixedly secured to another edge of said shelf, a second clamp located below said first clamp and pivotally secured by a pair of arms to said legs by suitable fasteners, a pair of extension rods slideably received in sleeves fixedly secured longitudinal to the sides of the lower portions of said legs, and said extension rods provide a means of engaging with a sloping ground surface to stabilize said ladder, whereby said ladder could be clamped to a single post by means of said clamps.
2. A special purpose ladder as set forth in claim 1, wherein each said extension rod is secured at any desired extension by means of a set bolt, said set bolt is received into an internally threaded projection fixedly secured to said sleeves at right angle and extending through an opening through said legs, and said set bolt which when tightened impinges against a floating collar surrounding the said extension rod wedging the said extension rod secure against the said sleeves.
CA000531180A 1987-03-05 1987-03-05 Special purpose ladder Expired - Fee Related CA1272169A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA000531180A CA1272169A (en) 1987-03-05 1987-03-05 Special purpose ladder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA000531180A CA1272169A (en) 1987-03-05 1987-03-05 Special purpose ladder

Publications (1)

Publication Number Publication Date
CA1272169A true CA1272169A (en) 1990-07-31



Family Applications (1)

Application Number Title Priority Date Filing Date
CA000531180A Expired - Fee Related CA1272169A (en) 1987-03-05 1987-03-05 Special purpose ladder

Country Status (1)

Country Link
CA (1) CA1272169A (en)

Also Published As

Publication number Publication date
CA1272169A1 (en)

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Legal Events

Date Code Title Description
MKLA Lapsed