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Title: |
1868 Article-Bartlett's Patent Power Mortiser |
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Source: |
Scientific American. / New Series, Volume 18, Issue 12; Mar 21, 1868; p. 177 |
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Insert Date: |
2/20/2017 12:33:24 PM |
Text of the article:
The engraving presents a perspective view of a power mortising machine which seems to possess some very decided advantages in portability, directness of action, compactness, and ease of handling. Beside, it can be placed, like a lathe or planer, on the floor of a shop, and is ready at once to receive a belt, requiring no bracing to keep it in place, as the machine - wholly of iron - has two supports, front and rear, as seen in the engraving.
While the machine is in operation the table, upone which the stuff is to be mortised, remains stationary, so far as its vertical movement is concerned, its only motion being a lateral one, governed by a hand wheel which passes the material gradually under the vibrating chisel.
The movable fulcrum at the top of the machine, sliding on planed ways, is actuated by the foot lever, so that when the foot is raised from the lever, a weight or other device, by a chain connection, brings the fulcrum forward and makes it dead center of the crank pitman, or a pivot on which the lever plays, so that no motion is imparted to the vertical chisel bar, although the machine may be running and the crank turning. To start the chisel the foot is pressed upone the treadle throwing the sliding fulcrum back until the requisite length of stroke is obtained. Thus, the depth of cut in the timber is entirely under the control of the operator. A screw with platen on one end and a hand wheel at the other secures the stuff in place, while another hand wheel will feed it across under the chisel. The upper portion of the carriage can be brought forward or back by another hand wheel, and the whole carriage or platen can be raised by a similar devie. All these appliances are directly in front of the operator and under his immediate notice, so that they can be operated by his hand without the slightest change of his position.
The advantages of a movement such as is shown in this machine are, that great power is obtained, and the operator is relieved from the severe jar experienced when operating machines where the stuff is brought up to the chisel by a rising table. Soon as the mortise is finished the operator raises his foot from the treadle, the sliding fulcrum returns to teh front of the machine, and the motion of the chisel instantly ceases, thus avoiding all danger from the chisel while changing the stuff.
Manufactured by Witherby, Rugg, & Richardson, 24 Central Street, Worcester, Mass., to whom all orders should be addressed. |
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