Fire escape – ladder – or scaffold – Scaffold horse beam or leg – Relatively movable
Reexamination Certificate
1999-07-22
2001-04-03
Stodola, Daniel P. (Department: 3634)
Fire escape, ladder, or scaffold
Scaffold horse beam or leg
Relatively movable
C182S186100, C182S153000, C182S155000
Reexamination Certificate
active
06209683
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to sawhorses and, in particular, to adjustable sawhorses.
The prior art reveals the concept of sawhorses or trestles having adjustable legs. These are useful when the device is used on uneven surfaces such as steps. Independently adjustable legs allow the upper cross member to be oriented horizontally at a desired height when the device is used on sloped or uneven surfaces. For example, U.S. Pat. No. 2325592to Degler discloses a trestle with telescopically adjustable legs.
U.S. Pat. No. 4565263 to Southworth discloses a sawhorse having adjustable leg assemblies that are selectively extendable and retractable to allow the cross beam to be moved to a selected elevation.
U.S. Pat. No. 4804064 to Coultrup et al. discloses a lightweight sawhorse where the respective lengths of each of the legs may be adjusted independently of one another.
A collapsible and adjustable trestle is disclosed in U.S. Pat. No. 3139950 to Borman.
U.S. Pat. Des. 280440 to Gromer Jr. shows an adjustable trestle with cross members extending between the legs.
U.S. Pat. No. 3110360 to Hearn discloses a sawhorse which is collapsible for storage.
It is therefore known in the prior art to provide sawhorses or trestles which are adjustable in height and have individually adjusted legs and cross members between the legs. However, there are limits to the maximum effective height of such sawhorses because, if the legs are extended beyond a certain height, the top of the sawhorse becomes inaccessible to the user. This is particularly true for sawhorses with telescopic legs. If the lower telescopic portions of the legs are too long, the top of the sawhorse may become effectively inaccessible.
It is therefore an object of the invention to provide an improved sawhorse having a top which is more accessible to the user.
Is also an object of the invention to provide an improved sawhorse having legs which are adjustable in height, but having a top which remains accessible to the user even when the legs are extended a significant distance.
It is a further object of the invention to provide an improved sawhorse which is simple and rugged in construction and which can be collapsed and stored conveniently when not in use.
SUMMARY OF THE INVENTION
There is provided, according to the invention, a sawhorse which has an upper cross member having two ends. There is a pair of legs hingedly connected to each end of the upper cross member. Each leg has an upper portion and a lower portion slidingly received by the upper portion. Each leg is independently adjustable in length. There is a latch mechanism on each leg for releasibly latching the upper and lower portion of each said leg together. There is a plurality of space-apart steps extending between the legs on each side of the sawhorse. The steps are parallel to the upper cross member. At least one of the steps is removal.
The latch mechanism may include a plurality of spaced-apart slots in the lower portion of each leg and a latch slidingly and selectively engagable in one of the slots.
Preferably the sawhorse includes one step fixedly connected to the upper portions of the legs on each side of the sawhorse. Each of the steps has opposite ends. One latch is mounted on each end of the one step.
In a preferred embodiment, at least some of the steps are removably connected to the lower portions of the legs.
REFERENCES:
patent: D. 280440 (1985-09-01), Gromer, Jr.
patent: 1169700 (1916-01-01), Waltower
patent: 1648844 (1927-11-01), Frisk
patent: 2506896 (1950-05-01), Shakowitz
patent: 2755981 (1956-07-01), Edwards
patent: 3110360 (1963-11-01), Hearn
patent: 3268031 (1966-08-01), Hampson
patent: 3858684 (1975-01-01), Goings
patent: 4024929 (1977-05-01), Mintz
patent: 4289215 (1981-09-01), Robinson
patent: 4298093 (1981-11-01), Wing
patent: 4565263 (1986-01-01), Southworth
patent: 4804064 (1989-02-01), Coultrup et al.
patent: 5954156 (1999-09-01), Cooke
Cameron Norman M.
Stodola Daniel P.
Thompson Hugh B.
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