US2428185A - Log-gripping and -centering sawmill dog assembly - Google Patents

Description

Sept. 30, 1947;v c. w. WALLACE LOG-GRIPPIHG AND CENTERING SAWMILL DG ASSEMBLY Filed sept. 2o,v 1944 3 sheets-sheet 1 u. mm. Rf, .j xb`||nu|m|lmrlllllllmlulml|hll l l l l Il' .|O||||.|M|||| l bm ,N N .ww NN mm. uw NWN -l r w .um .o ffm. N 1 lm wwm ffff .dwwmaalladulw m i||`|lw| 1a| f v\ y N S. uw Q uN C/laude s epf. 3o, 1947.

LOG-GBIPPING AND CENTRING SAWMILL DOG ASSEMBLY c. w. WALLACE 2,428,185

Filed Sept. 20, 1944 3 Sheets-SheetZ Inventor:

ClaudeW/Vjzllac,

WWW/19%@ Sept.4 30, 1947.

LOG-GRIPPHG AND CENTERING. SAWMILL DOIGASSEMBLY Filed sept. 2o. 1944 :s smetta-sham 's c. w. WALLACE 2,428,185 l Inventor;

claadewvwzza,

WWW m,

Patented Sept. 30, 1947 UNITED STATE LoGGmPrING AND -cENTEmNG sAwMlu.

` y DOG ASSEMBLY claude w. Wanne, columbia. unas. Application september zo, 1944,' serial No. 554,967'

1 claim. (cl. 14s-12s) The present invention relates to newand useful mprovements in dogs or holding apparatus for logs particularly adapted for holding logs firmly against movement in saw mills while being sawed. -Y

lThe principal object of the present invention is to provide a, power` operated dog adapted to utilize fluid pressure such as steam for power.

quickly release the same when itis desired to move the log into a new position or-release the same entirely. l

In thev drawings:

Figure 1 is a top plan view of the assembly.

Figure 6 is a fragmentary detailed sectional view taken 'on the line 6 6 of Figure 3.`

Figure 7 is a sectional view showing the dog assembly engaging a 10g and a saw cutting through the log, said saw being shown in broken lines.

Referring to the drawings wherein like nu' merals'de'signate like parts. itvcan be seen that the dog assembly consists of a pair of elongated channeled members E, 5 held in spaced and secured relationv by interposed U-shaped members 6 bolted or riveted in place as at Spanning one end portion of the thus constructed bed is a steam cylinder 3 having foot portions 9 bolted or otherwise secured as at l@ to the top anges of the channeled members 5.

Inthe cylinder 8 is a piston il from which a rod I2 extends through one end of the cylinder Figure 7 shows consists of a-pair of arcuate jaws 25, 26 pro-` vided with teeth 21 at the opposed sides thereof. The lower portion of the 'inner faces of the jaws 25. 26 are provided with teeth 28 which mesh so that the operation ofthe jaw 25 results in concurrent operation of the'jaw 28. ,Y

The outer intermediate portion oi. the jaw l25 is slightly reduced as at 29 to accommodate a knuckle 30 at the adjacent end of the link bar I4. The knuckle 30 is-interposed between a pair of ears 3i, 3i and a pin is disposed throughthese ears and the knuckle 3 0 for pivotally connecting the link bar i4 to the jaw 25.

The jaws 25, 2B are pivoted on pins 33 suitably mounted between the channeled members 5 (seeFigure 4).

'Figure2isaside elevational view. It can now be seen, thatv when the handle 22 Figure 3 is an enlarged' detailed sectional view is properly operated, steam will be admitted to 4vshowing gripping .iaWS Wlith Hf B01111011 0f One in 2o the cylinder ilwhile moving the piston i I in one section. direction or the other. If the piston is moved t0- Figure 4 is a section taken substantially on ward the right in Figure 2l the jaws wm be the lined-4 0f Figure 3- brought together to iirmly grip a log or other Figure 5 iS an eleVatiUnal View ofthe drive rod object interposed By agaln operating the hanconnected jaw.

'die 22, the valve 'i8 can be reversed and the steam or other uid' power is utilized for retracting the jaws so that the log or other object can bemoved dog assembly.

to a new position or entirely displaced from the a guide block 3S being shown in the act of 37,

a saw and thereon, the saw 35 cutting through a log claimed hereinafter.

Having described the invention, what is claimed as new is:

In a dog assembly for holding logs in sawf mills, a bedof two spaced rmly connected channels, a pair of coactmg jaws with interengaging block I3 to a link bar id the block I3 being 'teeth' for equal opposing angular gripping mo provided with a slidecollar I5 operating on a 45 tion on both sides of thelog and with opposing guide bar I6 supported by bridge members Il spanning. the channeled members 5, '5.

Numeral I8 denotes a reversing valve to which' a steam supply pipe I9 ing a cut-01T valve 2B therein.

A'rotary shaft 2| valve I8 and this has a hand-bar 22 at itsouter connects, this pipe havis provided for reversing the 6nd- A Steam exhaust pipe 23 leading from the' ing a workmg piston and piston rod, operating in cylinder has a cut-olf valve 24 therein. substantial parallelism to said bed a linkcon- The dOgSSembly itself as shown in Figure 3 55 nection between'said piston and one of said jaws.

a guide bar for said piston rod and for one end ot said link connection on said bed, and valve Number means arranged above the cylinder for admitting steam to the one or other side of the piston.

cLAUDE w. WALLACE.

A ARill', ELIENCESJ CITED The following references are of record in the m me of this patent:

NrrED s'pA'rEs Arwrmvrs Name Date Per Nov. 12, 1889 Krebs Oct. 12, 1909 Martin Oct. 10, -1933 Haase Jan. 23, 1934 Evrell Apr. 11, 1939 McRae Sept. 4, 1388 Smith Jan. 2B, 1890 Trout Jan. 29, 1918

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