US1054091A - Roof-jack. - Google Patents

Description

B vP. DARNALL.

ROOF JACK.

APPLICATION FILED AUG. 26, 1912.

1,054,091 Patented Feb. 25, 1913.

UNITED STATES PATENT OFFTCE.

BENJAMIN P. DARNALL, OF SAN ANTONIO, TEXAS.

ROOF-JACK.

To all whom. 2'25 may concern:

Be it known that I, BENJAMIN P. DAR- NALL, a citizen of the United States, residing in San Antonio, in the county of Bexar and State of Texas, have invented certain new and useful Improvements in Roof-Jacks, of which the following is a specification.

My invention relates to acks or brackets used to support planks or running-boards to provide a scaffold for the use of roofers, tinners, carpenters, etc., and the object of my invention is to provide a jack of this class which is simple in construction, may be easily applied to the standing seams of tin roofs and which will firmly support the plank or runningboard.

In carrying out my invention I form the jack with a slotted body portion adapted to straddle the standing seam and which is provided on its upper end with a laterally projecting arm adapted to receive and support the plank or runningboard.

The body portion of the jack carries a cam lever adapted to engage the seam and this lever cooperates with an abutment on the body of the clamp opposite the lever. The plank-supporting arm is slotted to receive the seam and carries an arched brace, the outer ends of which are adapted to rest on the roof and steady the jack.

In the accompanying drawings, Figure 1 is a perspective view of a roof with my improved jacks attached thereto and supporting a running-board. Fig. 9. is a perspective view on an enlarged scale of the jack, the running-board or plank being shown by dotted lines. Fig. 3 shows a transverse section on the line 33 of Fig. 2.

In Fig. 1 a tin roof is indicated at A and the standing seams thereof at a.

B indicates a plank or running-board resting on the jacks. It will be understood that a pluralitytwo or moreof jacks are employed to support the plank and that they may be secured to the seams of the roof at any desired elevation and can be moved from place to place as required. The workmen may stand on the scaifold thus constructed or they may rest a ladder thereon.

Specification of Letters Patent.

Application filed August 26, 1912.

Patented Feb. 25,1913. Serial No. 717,085.

The jack comprises a body portion 0 having an arm 0 at its lower end which projects outward and is relatively short, being in length only slightly greater than the height of the seam. A longer arm C projects outward from the body portion of the jack at its upper end and is of sufiicient length to receive and support the plank or running-board. The end of the arm is preferably bent at c in such manner as to bear against the front edge of the plank as shown in Fig. 1. The body portion 0, arm 0, and arm C are all slotted as shown, said slot being adapted to receive the standing seam a of the tin roof. It will be observed that the body portion is slotted from end to end, while the arms 0 and C are not slotted throughout, there being solid end portions m, 00 to hold the two parts of the arms and body together.

At D on one side of the slot an arch or bend is made in the body portion to provide an abutment against which the seam is pressed by a cam lever E pivoted to the body on the opposite side thereof.

F indicates an arched brace secured to the arm 0 and adapted to rest at its outer ends on the roof and steady the jack. The jack is applied to the roof by sliding it over a seam while the cam lever is open and then turning the lever until the cam e thereon firmly engages the seam and presses it against the abutment D. Preferably the arch and the cam are serrated or roughened as shown in order that they may take a firmer grip and preferably the cam is so formed and so applied that'the weight on the jack will tend to move the cam into closer engagement with the seam whereby any tendency for the jack to slip on the seam is avoided.

I claim as my invention:

1. A jack for roof scaffolds, comprising a slotted body portion adapted to receive the roof seam, a plank-supporting arm, an abutment on one side of the slot and a cam lever on the opposite side thereof adapted to press the seam against the abutment.

2. A jack for roof scaffolds, comprising a slotted body portion adapted to receive the roof seam, a slotted plank-supporting arm, In testimony whereof I have hereunto an abutment on one slde 0f the slot, a cam subscribed my name. lever 011 the opposite side thereof adapted to press the seam against the abutment and an DARNALL' arched brace secured to the plank-support- Vitnesses:

111g arm and adapted to rest 011 the roof and B. A. GREATHOUSE,

thus steady the jack. E. P. LIPSCOMB.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, I). G.

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