US1025088A - Intermittent grip device. - Google Patents

Description

C. HESS.

INTERMITTENT GRIP DEVICE. APPLIOATIONQIILED MAY13, 1911.

1,025,088, Patented Apr. 30, 1912.

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C. HESS.

INTERMITTENT GRIP DEVICE.

APPLICATION FILED MAY 13,1911.

Patented Apr. 30, 1912.

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CLARENCE HESS, 0F UNION, OREGON.

INTERMITTENT GRIP nnvicn.

Specification of Letters Patent.

Patented Apr. 30, 1912.

Application filed. May 13, 1911. Serial No. 626,887.

To all whom it may concern Be it known that I, CLARENCE Hess, a citizen of the United States, residing at Union, in the county of Union and State of Oregon, have invented new and useful Improvements in Intermittent Grip Devices, of which the following is a specification.

This invention relates to intermittent grip devices designed especially for ,use in connection with saw-mill set-works, and particularly to means for controlling the feed and locking pawls thereof.

In set-works of ordinary construction the sets of pawls must be separately retracted to release them from engagement with the ratchet wheel. i

The object of my invention is to provide a means by which both sets of pawls may be simultaneously thrown out by the foot of the operator, leaving both hands of the operator free to work the receder brake.

A further object of the invention 15 to provide a means for holding the pawls thrown out for any desired period.

The invention consists of the features of construction, combination and arrangement of parts, hereinafter fully described and claimed, reference being had to the accompanying drawings, in which:

Figure 1 is a side elevation of the pawl and ratchet mechanism of a saw-mill setworks embodying my invention, showing both sets of pawls in normal position. Fig. 2 is a similar view showing the pawls retracted. Figs. 3 and 4 are horizontal and vertical transverse sectional views through the device. Fig. 5 is a vertical front to rear section through the same. Fig. 6 is a detail view showing the supporting plate and associated parts. I

Referring to the drawings 1 and 2 designate the front and rear sills of a saw-mill set-works; 3, a carriage floor; 4, a supporting brackets arranged in parallel relation between the sills; 5, the shaft of the sawmill set-works; 6, the ratchet wheel thereon; 7, the operating lever pivotally mounted upon the shaft; 8, the adjusting or pull rod for controlling the pawls; 9, the front feed pawls pivotally mounted upon the forked lower end 10 of the lever; and 11, the rear locking pawls pivotally mounted upon a bolt extending between the rear ends of the brackets 4.

Extending between and suitably secured to the rear ends of the brackets 4 is a supporting plate 12, in which are adjustably mounted spaced vertical rods 13, held in adjusted position by nuts 11. The upper ends of these rods are arranged to lie in the path of movement of the arms of the forked lower end 10 of the lever, to support said lever when tilted to the limit of its rearward movement. Also mounted upon the supporting plate at a point between the rods 13 is a bolt 15 having a depending forked lower end 16, to which the rear end of a segment 17 is pivotally connected by a pin or bolt 18. This segment extends through the forked lower end 10 of the lever and the forked lower end 19 of the pull rod and normally rests at its forward end upon the front sill 1.

The rod 8 is slidably mounted on the lever and normally held down by a spring 20 and is adapted to be moved upwardly against the resistance of the spring by means of a controlling chain or the like 21 terminally secured to the upper ends of the rod and the lever. The fork 19 has a pivotal connection with the lower end of the rod and is pivotally connected with the front feed pawls 9, so that upon the upward movement of said rod said pawls will be retracted. A pin 22 extends between the arms of the fork 19 and beneath the segment 17 by which on the upward motion of the rod the segment will also be elevated, for a purpose hereinafter described.

As shown, the rear locking pawls 11 are pivotally connected with the rear end of the segment by links 23, and to said segment above the point of connection of the links therewith is attached a controlling chain 2 1, which leads rearwardly therefrom and is suitably fastened at its rear or free end to a block or beam 25 fastened to the floor 3. The chain is normally stretched taut, and is adapted to be depressed by the foot of the operator, as illustrated in Fig. 2, so as to swing the segment 17 upwardly on its fulcrum 18, whereby the locking pawls will be retracted. In this operation the segment will also engage the lower end of thepull rod or bight of the fork and retract the feed pawls 9. Similarly, it will be understood that when the pull rod is elevated to retract the front feed pawls the pin 22 will engage and lift the segment and thereby retract the rear locking pawls.

It will thus be seen from the foregoing description that the operator may, at any time, retract both sets of pawls simultaneously by hand or foot power, best suits his convenience, and that by depres sion of the chain 241 to perform this function both hands of the operator will be left free to work the receder brake. the chain 24? is secured to the block 25 by the engagement of one of its links with a pin or stud 26 on the block, so that when desired the chain may be drawn rearwardly to tilt the segment and engage with the pin or stud to hold. the pawls retracted for any desired length of time.

Having thus described the invention, what I claim is:

1. The combination with supporting brackets, a shaft JOUIllZtlGCl 1n said brackets,

a ratchet wheel on said shaft, a lever piv oted to the shaft, a spring pressed rod carried by the lever, said rod having a pivoted fork at its lower end, a feed pawl pivotally connected with the lever and fork, a segment pivotally supported at its rear end by the brackets and extending between the arms of said pivoted fork, a pin carried by the fork and bearing against the segment, a locking pawl pivotally supported} by the brackets and pivotally connected with the pivoted end of the segment, and stop devices carried by the bracket to engage the arms of the lever fork to limit the rearward movement of said lever.

Preferablv 2. The combination with a pair of spaced brackets, of a shaft journaled in said brackets, a ratchet wheel mounted on said shaft, a lever having a forked lower end pivota-lly engaging the shaft, a spring depressed pull rod carried by the lever and provided with a pivoted fork at its lower end, a feed pawl pivoted to the lever and fork, a supporting plate carried by the brackets, a segment pivotally connected at its rear end with said plate and extending through the fork of the lever and the said pivoted fork, a pin carried by the pivoted fork and engaging the segment whereby the segment may be tilted upward on the retractive movement of the rod, a locking pawl pivoted to the plate and pivotally connected with the pivoted end of the segment, stop rods projecting upward from the plate and lying in the path of movement of the arms of the lever fork, an engaging member, and a chain connected at one end with the pivoted end of the segment and adapted to have its links connected with said engaging member.

In testimony whereof I afiix my signature in presence of two witnesses.

CLARENCE HESS.

Witnesses:

H. A. HALL, CLARENCE MILLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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