Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder – Trestle
Reexamination Certificate
1999-08-12
2001-10-09
Chin-Shue, Alvin (Department: 3634)
Fire escape, ladder, or scaffold
Unitary foldable, rigid scaffold or ladder
Trestle
C182S182100, C182S183100
Reexamination Certificate
active
06298946
ABSTRACT:
BACKGROUND OF THE INVENTION
This application claims priority from Israeli Patent Application No. 125793, filed Aug. 14, 1998, the contents of which are incorporated herein by reference.
FIELD OF THE INVENTION
The present invention relates to a sawhorse and, more particularly, to a height and/or working width adjustable sawhorse. The present invention further relates to a sawhorse having its base members modified to render them stronger when operably deployed, yet avoid occupying extra space when collapsed (folded, closed) together.
A sawhorse is a movable frame or trestle for supporting wood while it is being sawed or for supporting plates to provide working spaces. A sawhorse typically includes two base members hingedly connected at the tops thereof and a locking mechanism which defines the working spread at their bottom.
Traditionally sawhorses were made of wood or metal, however, following the technological progress of the plastic industry, sawhorses are nowadays also available from plastic materials.
For whatever purpose it is employed, it is advantageous for a sawhorse to be adjustable both in height and in working width. Height adjustability is advantageous because it enables users of different heights to adjust the height of the sawhorse to be most comfortable for them. Working width adjustability is advantageous as it enables working width versatility.
Prior art sawhorses are known which are height adjustable. Such device have extendible/retractable extensions housed by the lower ends of their base members. Such devices suffer a limitation because the process of height adjustability is highly demanding. It requires a user to independently adjust four individual extensions in each sawhorse. Adjustment of each of the four extension calls for bending over (or turning the sawhorse upside down), pulling out the extension and securing it in its new extended or retracted position. For stability, measures should be taken by the user to ensure that all extensions are extended to a similar extent.
Although there is a long felt need for working width adjustable sawhorses, the prior art fails altogether to teach working width adjustable sawhorses.
There is thus a widely recognized need for, and it would be highly advantageous to have, a height and/or working width adjustable sawhorse which enjoys the above advantages yet is devoid of the above limitations.
It would also be highly advantageous to have a sawhorse having its base members modified to render them stronger when operably deployed, yet avoid occupying extra space when collapsed together.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a height adjustable sawhorse, in which height adjustability is embedded at a top portion thereof.
It is another object of the present invention to provide a working width adjustable sawhorse.
It is yet another object of the present invention to provide a sawhorse having its base members modified to render them stronger when operably deployed, yet avoid occupying extra space when collapsed together.
It is yet another object of the present invention to provide a sawhorse fulfilling any complete or partial combination of the above objects.
Thus, according to one aspect of the present invention there is provided a sawhorse comprises a base assembly including a first base member and a second base member. The first base member has a first top end, and the second base member has a second top end. The second base member is pivotally connected at the second top end to the first top end of the first base member. The first and second bases members are pivotally movable between a folded storage position and an extended operative position. A vertically extendible top member is constructed and arranged to be adjustably mounted in varying vertical positions with respect to the base assembly. The extendible top member includes an elongated, laterally extending top element constructed and arranged to support a workpiece, and a pair of elongated extension elements that are constructed and arranged to be adjustably engaged at varying vertical positions relative to the base assembly so as to adjust the height of the top element.
According to another aspect of the present invention there is provided a sawhorse comprising (a) an extendible top member featuring a top element and at least one extension element connected to or integrally formed with the top element; (b) a first base member having a first top end, the first base member being designed for accepting at least one extension element of the top member; and (c) a second base member having a second top end, the second base member being hingedly connected at the second top end to the first top end of the first base member.
According to yet another aspect of the present invention there is provided a sawhorse comprising (a) an extendible top member featuring a top element and at least one extension element connected to or integrally formed with the top element; (b) a first base member having a first top end; (c) a second base member having a second top end; and (d) an intermediate member being designed for accepting at least one extension element of the top member, each of the first and second base members being hingedly connected at the first and second top ends thereof to different sides of the intermediate member.
According to still another aspect of the present invention there is provided a sawhorse comprising (a) a first base member having a first top end; (b) a second base member having a second top end, the second base member being hingedly connected at the second top end to the first top end of the first base member, and (c) an extendible top member being integrally formed with or connected to at least one of the first and second base members.
According to a further aspect of the present invention there is provided a sawhorse comprising (a) a first base member having a first top end; and (b) a second base member having a second top end, the second base member being hingedly connected at the second top end to the first top end of the first base member; wherein the first base member has a closed cross section and further wherein the second base member has an open cross section, the closed and open cross sections are selected such that when the sawhorse is folded by bringing the first and second base members together, the second base member overlaps and houses the first base member.
According to further features in preferred embodiments of the invention described below, the sawhorse further comprises a spread limiting mechanism for limiting a spread of bottom ends of the first and second base members. According to still further features in the described preferred embodiments the spread limiting mechanism is shaped as a shelf, the shelf is hingedly connected to one of the first and second base members and locks the other when deployed.
According to still further features in the described preferred embodiments the sawhorse further comprises a securing mechanism for securing at least one extension element of the top member at a desired extended position.
According to still further features in the described preferred embodiments the securing mechanism is effected by the second top end of the second base member.
According to still further features in the described preferred embodiments the securing mechanism is effected by the first and second top ends of the first and second base members.
According to still further features in the described preferred embodiments the sawhorse further comprises at least one hook being connected to or integrally formed with at least one of the first and second base members.
According to still further features in the described preferred embodiments the sawhorse further comprises a socket holder being connected to or integrally formed with at least one of the first and second base members.
According to still further features in the described preferred embodiments the sawhorse further comprises a cable holder being connected to or integrally formed with at least one of the first and second base members.
Noiman Eran
Yemini Zvi
Chin-Shue Alvin
Pillsbury & Winthrop LLP
ZAG Industries Ltd.
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