US1617584A - Girt-pin connection for gang saws - Google Patents

Description

Feb. 15

F. s. F LOETER GIRT PIN CONNECTION FOR GANG SAWS 2 Sheets-Sheet 1 Filed March 2. 1925 ha II drmkmry 1927. Feb 15 F. s. FLOETER GIRT PIN CONNECTION FOR GANG SAW$ 2 sheets-sneak 2 Filed March 1925 .FIG.3

ATTORNEY Patented Feb. 15, 1927.

UNITED STATES PATENT OFFICE.

FREDERICK S. FLOETER, OF SAGINAW, MICHIGAN, ASSIGNOR TO WICKES BROTHERS, A CORPORATION OF MICHIGAN.

GIRT-PIN CONNECTION FOR GANG SAWS.

Application filed March 2, 1925.

This invention relates to gang saws and pertains to an improved construction of the saw-carrying frame or sash, which, as usual, is reciprocatcd vertically by means of a crank and pitman.

More specifically my improvement has to do with the arrangement of the lower girt or member of the sash that forms the journal bearing connection for the pitman.

An object of the present invention is to cheapen the cost of manufacture by reducing the amount of labor required in forming the lower girt pin, and also by making the girt pin removable to permit a cheaper and simpler form of top pitman bearing to be employed.

Another object is to provide means for adequately lubricating the pitman bearing, also the laterally projecting trunnions or horns that carry the guide-blocks which sl de up-and-down in the frame of the machine while guiding the sash in its rapid reclproeating movement.

Heretofore it has been customary to hew the girt pin out of the solid metal that forms the bottom cross member of the reciprocating sash. This member usually consisted of a steel forging comprising a flat web bolted to the sash, and a massive lower edge which was shaped by hand to form the girt pin bearing. This pin was usually integral with the web and consequently the pitman bearing had to be made 1n halves in order to enable it to be assembled on the pin. The bearing, therefore, usually consisted of a strap, gib and key, with a divided or two-piece bronze box; a very expensive construction and not a very accurate bearing surface.

In my improved device I make the girt pin removable and in consequencecan employ a pitman having an upper bearing made in one piece, and having a turned bronze bushing with a compression slot for adjustment; a cheap and efiicient construction.

This improved girt pin is not only renewable in case of wear, but also is a reservoir for lubricant, enclosed within the tubular member of the lower girt.

Formerly the oiling of the pitman and central girt pin bearing was accomplished by bolting an oil reservoir to the girt and piping the oil to the bearing. This reservoir had to be very strong and heavy, because in the operation of the gang saw the Serial No. 12,732.

girt pin itself constitutes the reservoir forlubricant.

With the foregoing and certain other objects in View, which will appear later in the specification, my invention comprises the devices described and claimed and the equivalents thereof.

In the drawings, Fig. 1 is a side view of a part of a gang saw embodying my improvement.

Fig. 2 is a front view of the reciprocating sash.

Fig. 3 is a side view. I

Fig. 4 is a section on the line H of Fig. 2.

As is clearly shown in the drawings, the gang saw consists in the usual frame 1 carrying feed rolls 2 and saws 3. The saws are mounted in the usual sash having stiles 4 tied together by cross braces as shown in Figs. 2, 3 and 4. The lower ends of the sawsare secured in any usual manner to the Ii-head slot, 5, in the web 6 of the lower girt.

As is usual in gang saws, the stile 4L of the sash is guided in its reciprocating movement by slidable guide blocks 7 usually of wood, carried by the outwardly projecting trunnions or orns 8. The guide blocks 7 run in suitable ways 9 carried by the frame.

At the lower end of the girt web 6 and preferably integral therewith is a pair of tubular members 10, 10, spaced apart endwise, as at 11, to receive between them the upper pitman bearing 12.

The hollow tubular girt pin 13, which may be of hardened steel, accurately ground, extends through both members 10, 10, and the guide block horns 8 are secured to its outer ends. Preferably the ends of the girt pin are counterbored to receive the horns, and a tapered locking pin 14: is passed through the tubular member 10, girt pin 13 and horn 8, firmly fixing the parts as shown in Fig: 3.

Each horn is formed with a longitudinal lubricant channel 15 connecting the interior of the girt pin 13 with the external bearing surface of the horn 8, thus lubricating the rubbing surfaces of the horn in guide block 7. The interior of the girt pin may be supplied with lubricant by means of a filler tube and cap 16, and lubricant delivery openings 17 are provided through the wall of the girt pin near the middle of its length for supplying lubricant to the rubbing surfaces of the pitman bearing 12.

The pitman bearing 12 can now be made, as previously stated, with a. one-piece turned bronze bushing having a compression slot, the head of the pitman being slitteol, so as to be tightened by a clamping bolt, as is usual in bearings of this kind. The use of this type of bearing, however, is made possible only by the removable girt pin 13, for the reasons previously given.

To prevent too violent splashing and consequent excessive rate of oil feed to the rubbing surfaces I prefer to employ fibre wicks 18 in the various lubricant delivery channels and openings.

I secure satisfactory lubrication and avoid the use of the heavy container for lubricant heretofore employed and I also secure lightness without impairing strength, by making the girt pin 13 hollow and utilizing it as an oil reservoir which not only furnishes direct lubrication to the pitman bearing, but

. also to the two horn bearings.

Having thus described my invention what I claim and desire to secure by Letters Patent is:

1. A lower girt for a gang saw sash,'comprising in combination, a web having a sawengaging head at its upper edge and a pair of tubular members, spaced apart, at its lower end, a tubular girt pin within said tubular members and spanning the space be tween them, laterally projecting guide-block horns fixed in the ends of said girt pin, each horn formed with an oil channel connecting the interior of the girt pin with the external bearing surface of the horn, means forsupplying lubricant to the interior of said girt pin, and lubricant delivery openings through the wall of said girt pin.

2. A lower girt for a gang saw sash comprising in combination a web having a pair of integral tubular members, spaced apart, at its lower end, a removable tubular girt pin within said tubular members, laterally projecting guide-block horns removably secured in the ends of said girt pin, each horn formed with a longitudinal lubricant channel, means for supplying lubricant to the intcrior of said girt pin and lubricant-delivery openings through the wall of said girt pin near the middle of its length.

3. In combination with a gang saw having a reciprocating sash and a pitman, a flat web having at its lower end a pair of tubular members spaced apart to receive a bearing of said pitman between them, a tubular girt pin within said tubular members, laterally projecting guide-block horns forming closures for the ends of said girt pin, each horn formed with a lubricant channel, lubri cant delivery openings through the wall of said girt pin to said pitman bearing, and means for supplying lubricant to the interior of said girt pin- 4. In combination, a lower girt for a gang saw sash having a pair of tubular members spaced apart to receive a pitman bearing, a tubular girt pin within said tubular members, laterally projecting guide block horns on the ends of said girt pin, means for supplying lubricant to the interior of said tubular girt pin and means for feeding lubricant therefrom to the external surfaces of the guide block horns and to said pitman bear ing during the operation of the sash.

In testmony whereof I aflix my signature.

FREDERICK S. FLOETER.

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