US145382A - Improvement in blowing-machines - Google Patents

Description

1. a. BAKER, Blowing-Machines.

145,382I Patented-Dec. 9,1873. l Ila.;

UNITED STATES PATE1,\TT\QTF1CE.

JOHN Gr. BAKER, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN BLOWING-MACHINES.

Specification forming part of Letters Patent No. 145,382, dated December 9, 1873; application filed November 24, 1873.

To all 'whom it may concern:

Be it known that I,JoHN G. BAKER, of Philadelphia, Pennsylvania, have invented an Improved Blowing-Machine, of which t-he following is a specification:

The object of my invention is to obtain a continuous supply of compressed air by combining, within a chest, A, a revolving cylinder, B, having two vanes, a and a', and two revolving and slotted cylinders, D and D', as shown in the vertical section, Figure l, of the accompanying drawing, so that as the cylinder B turns in the direction of the arrow air will enter the casing at the inlet G, and will be discharged, under a pressure depending upon the speed of the cylinder, through the outlet H, the cylinders l) and D serving to prevent lcommunication between the inlet and outlet under all circumstances, while their slots permit the free rotation of thc vanes. The main advantage of my improved blower is its comparative freedom from the friction which detracts from blowers of this class. The chest A is composed of two heads, b b, (one of which is shown in the longitudinal section, Fig. 5, of half of the mael1`ine,) the intervening casing d, and the base c, all being properly fitted and secured together. The top of the chest Ais semi-cylindrical and concentric with the cylinder B, the shaft f of which passes through the head b and bearing E at both ends of the machine. The lower portion ofthe chest is rectangular, or of any other form, so as to admit the two slotted cylinders D and D', each closed end of each of which tits snugly, but so as to turn freely, in a recess, h, formed in the inside of the head, as shown in 5, the shaftgi of each of these rollers passing through the head and through a bearing, F, attached to the same. rFhe shafts f e' z' are geared together by wheels I, J, and J', (shown in Fig. 6,) these wheels bearing such proportion to each other that the cylinders D Dl will revolve exactly twice as fast as the cylinder B. The cylinder B is as close to the cylinders D and Dl as possible without being in absolute contact therewith, and the outer edges of the vanes, while they are not permitted to touch the upper semicylindrical portion of the chest, must revolve in close contiguity with the same, the same rule being observed as regards the proximity of the ends of the cylinders with the inside of the heads, and of the cylinders D and D with the blocks m m, which I prefer to make of wood, and which extend from end to end of :the chest.

Gomparatively nice workmanship will be demanded in carrying out this rule, and there must necessarily be a slight leakage at many of the points which, theoretically speaking, should be tight 5 but the loss by leakage will be very triliing, compared with the loss ot' power by friction, if the Darts referred to above were in actual contact with each other 5 in other words, the slight loss by leakage is much more than compensated for by the freedom of the moving parts of the machine from f friction al contact with each other and with the chest. The latter may be so contracted as to be close to the cylinders D and D, in which case the blocks m m may be dispensed with, but I prefer the use of the blocks, and to so connect tliem to the casing that they can be adjusted to the said cylinders.

The operation of the machine will be best understood by an examination of Figs. 1, 2, 3, and 4, which represent the moving parts of the machine in different positions. In Fig. 1, for instance, the vane a is in the act of forcing compressed air through the outlet H, while air has free access to the space behind this vane and above the vane a. 'While the parts are in this position the compressed air is prevented from escaping through any other course than the outlet, by the close contiguity of the eylinder B with the cylinder D, and of the latter with the block m. When the vanes have arrived at the position shown in Fig. 2, the vane a will have forced its supply of compressed air through the outlet, and the vane c will have commenced to perform the same duty with another supply, while the cylinder D presents its slot or opening to the vane a, and

permits the latter to pursue its course without contact with any part of the said cylinder D. When the vanes have arrived at the position Fig. 3, the compressed air in front of the vane a can pass the cylinder D, but will be arrested by the cylinder D in its attempts to gain access to the inlet end of the chest.

VVha-tever the position of the vanes may be,

one or other, or both, of the cylinders D and slotted cylinders D and D', all substantially Dl will prevent all communication between as described.

the inlet and outlet sides of the chest, While In testimony whereof, I have signed my the slots of these cylinders will always be prename to this specification in the presence of sented to the vztnes -atthe )froper time to enzttwo subscribing` ntnesses.

ble them to pursde an l'innt'rrnpted course. JOHN G. BAKER.

I claim as my invention- Vitnesses: A blower in which are Combined, Within a NVM. A. STEEL,

chest, A, n Cylinder, B, its venes a a', and the I-IARRY SMITH.

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