US4308934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Work support
Assignee: Black and Decker Inc
•
Filing: 1979-02-08
•
Granted: 1982-01-05
•
Expires: 1999-02-08
Abstract
Abstract A one piece frame or channel for a work support which is usable during building or construction principally as a support at ground level or as a scaffold at elevated levels regardless of whether the surface is even, irregular or constitutes different heights. The channel is used in pairs to form the work support. A plurality of legs are conveniently made from two-by-fours which are clamped to the channel at a suitable height in conformance with the ground so as to set the plank horizontally which plank extends across the pair of laterally spaced channels. Top brackets are interlocked in the top portion of the channels to engage and to hold the plank in assembled position. A clamp is carried on leg portions of the channel on an axle journaled in punched support lugs. A spring biases the clamp to engage the legs. Teeth are formed on the clamp to secure the legs in adjusted position. The channel has a base at its inner side formed with a radius at the edges thereof which turn out into flanges, which radius co-acts with the clamp to wedge-lock the right angled edges of the leg thereagainst. Lock tabs are formed on the top brackets to freely slide within outturned support flanges of the channel to permit adjustment of the top brackets prior to their being bolted in assembled position. When disassembled the top brackets can be stored within the top portion of the channel.
Inventors
- 👤 Ronald A. Jackson
- 👤 John Maruscak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:25
CPC Classifications
B; B25; B25H; B25H1/00; B25H1/06
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
159 words
A frame for a work support to carry a plank and to receive legs of varying heights comprising: (a) a channel of one piece, having a base formed on the inner side thereof with outturned flanges at opposite edges of the base, (b) the channel has a top portion to receive the plank and oppositely formed leg portions sloping outwardly and downwardly from the top portion, (c) the leg portions have continuous recesses extending from the inner side of the channel to open at the outer side of the channel, (d) at least one top bracket affixed to the top portion of the channel to engage and to hold the plank thereon, (e) a pair of support lugs formed integrally with each of the leg portions, and (f) a clamp extending across the recess of each of the leg portions to be pivotally connected to the support lugs to releasably engage the legs and set the individual heights thereof.
Claim 2
Dependent Claim
159 words
A frame for a work support to carry a plank and to receive legs of varying heights comprising: (a) a channel of one piece, having a base formed on the inner side thereof with outturned flanges at opposite edges of the base, (b) the channel has a top portion to receive the plank and oppositely formed leg portions sloping outwardly and downwardly from the top portion, (c) the leg portions have continuous recesses extending from the inner side of the channel to open at the outer side of the channel, (d) at least one top bracket affixed to the top portion of the channel to engage and to hold the plank thereon, (e) a pair of support lugs formed integrally with each of the leg portions, and (f) a clamp extending across the recess of each of the leg portions to be pivotally connected to the support lugs to releasably engage the legs and set the individual heights thereof.
Claim 3
Dependent Claim
42 words
The combination claimed in claim 1 wherein: (a) biasing means is connected between the clamp and the leg portions to urge the clamp toward the base of the channel to hold the legs in adjusted positions within the recesses of the channel.
Claim 4
Dependent Claim
38 words
The combination claimed in claim 2 wherein: (a) the clamp is a one piece member which encircles the channel from lug to lug and has one of its ends extending substantially beyond the channel to form a handle.
Claim 5
Dependent Claim
41 words
The combination claimed in claim 3 wherein: (a) the clamp extends at an angle to the leg portion, (b) the handle is bent to lie in a substantially horizontal plane, and (c) a vinyl handle grip is affixed over the handle.
Claim 6
Dependent Claim
32 words
The combination claimed in claim 4 wherein: (a) the biasing means define a spring interconnected between the clamp and the leg portion to urge the clamp in the direction of the base.
Claim 7
Dependent Claim
62 words
The combination claimed in claim 1 wherein: (a) the top bracket includes a pair, one being disposed on each side of the plank, (b) the base of the channel being slotted across the top portion thereof, and (c) fastener means adjustably connecting the top brackets to the base within the top portion of the channel whereby the plank is securely held therebetween.
Claim 8
Dependent Claim
108 words
The combination claimed in claim 2 wherein: (a) a pair of support lugs is punched out of the channel at the closed side of the channel to extend in a direction away from the open side thereof, (b) the clamp extending across the open side of the leg portion from lug to lug, (c) an axle journaling the clamp to the lug, and (d) a spring interconnected between the clamp and the leg portion to yieldably urge the front portion of the clamp toward the recess whereby the leg will be forced into the recess and the right angle edges thereof wedge-locked into engagement with the radius therein.
Claim 9
Dependent Claim
28 words
The combination claimed in claim 7 wherein: (a) the length of each of the leg portions is shorter than the length of the top portion of the channel.
Claim 10
Dependent Claim
27 words
The combination claimed in claim 8 wherein: (a) the combined length of both leg portions is less than the length of the top portion of the channel.
Claim 11
Dependent Claim
45 words
The combination claimed in claim 9 wherein: (a) the leg portions are formed at a compound angle so as to have the bottom of adjacent legs intersect a hypothetical vertical plane which in turn intersects a hypothetical horizontal plane in which the plank is disposed.
Claim 12
Dependent Claim
61 words
The combination claimed in claim 2 wherein: (a) at least one outturned top flange is formed at the upper surface of the top portion of the channel supportively to receive the plank, and (b) the top brackets have a locking tab extending beneath the top flange to permit sliding engagment between the top bracket and the top portion of the channel.
Claim 13
Dependent Claim
61 words
The combination claimed in claim 11 wherein: (a) the top flange is formed as a pair of top flanges extending outwardly from the top portion in opposite directions, and (b) a pair of lock tabs formed on the top bracket, one slidingly engaged with each of the top flanges to hold the top brackets to the top portion of the channel.
Claim 14
Dependent Claim
43 words
The combination claimed in claim 12 wherein: (a) the top brackets having a pair of inwardly turned flanges lying in substantially the same plane as the plane of the said top flanges to provide further support for the plank and prevent dislodging thereof.
Claim 15
Dependent Claim
95 words
The combination claimed in claim 13 wherein: (a) the leg portions are formed at a compound angle so as to have the bottom of adjacent legs intersect a hypothetical vertical plane which in turn intersects a hypothetical horizontal plane in which the plank is disposed, and (b) the top brackets formed in a pair of facing right hand and left hand brackets set off at an angle corresponding to the angle of the top portion so that the top surface thereof lies in a plane above and parallel to the plane of the top flange.
Claim 16
Dependent Claim
50 words
The combination claimed in claim 14 wherein: (a) the top brackets having a plurality of predetermined openings along the length thereof, and (b) fastening means to pass through the last mentioned openings and to engage the sides of the plank to lock the plank to the top brackets and channels.
Claim 17
Dependent Claim
101 words
The combination claimed in claim 2 wherein: (a) the top portion of the channel has a width substantially equal to the width of the legs and a predetermined depth and length, (b) the top brackets having a length shorter than the length of the top portion of the channel, (c) the top brackets normally in assembled position are disposed perpendicular to the top portion and lying across the width thereof and extending beyond the opposite sides of the top portion, and (d) the top brackets are nested within the inside of the top portion of the channel in disassembled stored position.
References Cited (Backward Citations)
US351143A
Cited
US371279A
Cited
US714761A
Cited
US860161A
Cited
US878455A
Cited
US1271095A
Cited
US1441806A
Cited
US2038899A
Cited
US2216912A
Cited
US2583437A
Cited
US2891819A
Cited
US3080015A
Cited
US4062423A
Cited
US4228871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |