|
Title: |
1911 Article-Welch Hammer & Machine Co., Power Hammer |
|
Source: |
Machinery Magazine, V17, Jun 1911, pg. 827 |
|
Insert Date: |
3/23/2019 3:37:04 PM |
VARIABLE-BLOW POWER HAMMER
A variable-blow power hammer recently put on the market by the Welch Hammer & Machine Co., 1523 Williamson Bldg., Cleveland, O., is illustrated in Figs. 1 and 2. The distinctive feature of this machine is the method of transmitting the motion of the eccentric which actuates the helve, to the latter through a link mechanism by means of which the throw of the helve and the blow is varied at the will of the operator.
A swinging bracket which supports and pivots one end of the link segment, is balanced on bronze bushings that also form the main bearings of the driving shaft. This bracket is connected by means of two short links to the treadle. A hardened bearing block, accurately fitted to the slot in the link Segment, has end bearings in two U-links that are suspended from the beam lever. The short ends of these U-links are connected by means of straight links, to points in the housings directly in line with the pivot point of the link segment at full stroke. Fig. 1 illustrates a 60-pound hammer (arranged for belt drive) with the link segment on the dead center. The pivot pin of the link segment is in perfect alignment with the center of the sliding block segment, when on the dead center, so that as the free end of the segment is oscillated by the eccentric on the driving shaft, no motion is transmitted to the helve. The stroke or throw of the helve is therefore varied at the will of the operator from an absolutely dead position to the full stroke. The machine runs at a constant speed of about 300 revolutions per minute, and the advantage of being able to strike light finishing blows at high Speed for a large class of work will be apparent.
Fig. 2 shows the machine with a direct-connected motor drive, and with the link segment shifted to the position of full stroke. The flywheel for a belt drive and the motor and gearing for a motor drive, can be applied to either side of the machine, and the motor drive is applicable to all sizes and styles. A balancing mechanism located between the housings balances the swinging bracket and removes all weight of the helve from the link. The helve is balanced on a pivot shaft and beam lever by means of the coil springs seen on top of the helve. These springs are adjustable and keep the helve under tension, with the result that it vibrates like a spring and strikes an exceedingly sharp and snappy blow. The proportions of this machine are very generous. The anvil weighs 1500 pounds, or twenty-five times the weight of the hammer head, and the complete machine weighs about 5000 pounds. All the links and other small parts subject to strain or shock are steel castings or forgings. The helve is made of Seasoned hickory. This machine will be made in all standard sizes and in other styles with guided heads to suit all classes of work.
US Patent: 955,623
http://datamp.org/patents/displayPatent.php?number=955623&typeCode=0 |
|
1911 Welch Hammer & Machine Co., Power Hammer
1911 Welch Hammer & Machine Co.-Power Hammer with Motor Drive
|
|