US641951A - Logging-jack. - Google Patents

Logging-jack. Download PDF

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Publication number
US641951A
US641951A US71304799A US1899713047A US641951A US 641951 A US641951 A US 641951A US 71304799 A US71304799 A US 71304799A US 1899713047 A US1899713047 A US 1899713047A US 641951 A US641951 A US 641951A
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Prior art keywords
jack
logging
bar
shown
lifting
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US71304799A
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Alexander Munsie Gilchrist
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Alexander Munsie Gilchrist
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/02Devices, e.g. jacks, adapted for uninterrupted lifting of loads with racks actuated by pinions

Description

(No Windel.)

Patented Ian. 23, [900. A. M. GlLcHmsT.

LOGGING JACK.

@Application med Apr. 14, 1899.)

Arron-'N J...

UNITED STATES PATENT OEEICE.

ALEXANDER MUNSIE GILOHRIST, OF SOTH BEND, VASHINGTON.

LOGGING-JACK.

SPECIFICATION forming part of Letters Patent No. 641,951, dated January 23, 1900. I

` Application filed April 14, 1899. Serial No. 713,047. (No model.)

T0 all whom it may concern.-

Be it known that l, ALEXANDER MUNsIE GILCHRIST, of South Bend, in the county of Pacific and State of Washington, have invented a new and Improved Logging- Jack, of which the following is a full, clear, and exact description.

My invention relates to an improvement in logging-jacks and comprises the novel features which will be hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of my device. Fig. 2 is an elevation taken at right angles to that of Fig. 1 with a portion of the frame broken away at the top. Fig. 3 is a sectional elevation taken from the same side as shown in Fig. 1. Fig. l is a detail view of the mechanism for operating the ratchet-wheel. Fig. 5 is a sectional plan view through the stand-` ard, and Fig. 6 is a perspective view of the cap which covers the upper end of the frame.

My logging-jack, as herein shown, is similar in many respects to the logging-jack shown in the patent granted March 17, 1896, Serial No. 556,625, to John E. Gilchrist. My device differs, however, from the jack shown in said patent in certain respects, which will be hereinafter particularly pointed out.

One object sought to be accomplished by my present improvement is to provide the bar of the jack with a hook located upon its lower end, by means of which it may be enabled to engage a log close to the ground instead of having to place the upper end of the jack beneath the log.

A further Objectis to strengthen the construction of the casing, so that it may be used for heavier work without much danger of collapsing. The casing, as herein shown, consists of the two side plates A, of steel, having a Iiller-bar B inserted between them at one edge.v

These side plates are secured to each other and to the ller-bar B by means of rivets, bolts, or any other suitable means. Theflllerbar thus forms a support for the plates from the lower end to just below the pivot uponl which the lever is mounted, and in addition to this furnishes the strength of its crosssection. It also in connection with the side plates Aforms a groove for the reception and guiding of the lifting-bar D. This lifting-bar is formed of steel and has teeth d cut in its inner edge, said edge bearing against the edge of the filler-bar B.

The mechanism for raising and lowering the lifting-bar may be of any suitable or desirable construction. l have, however, here in shown mechanism similar to that shown and described in the patent previously re ferred to. This mechanism in brief consists of a pinion C, which is mounted upon ashaft C', carrying a ratchet-wheel E, said ratchetwheel being engaged by a pawl G upon the operating-lever F, said pawl G being controlled in position by means of a controllinglever G. The ratchet-wheel is also provided with a stop pawl e, which is controlled by a hand-lever c. The upper end of the lever F is recessed, thereby forming a hook adapted to engage the shaft C.

The upper end of the groove containing the lifting-bar D is closed on its outer edge by means of a plate A', which is a continuation of one of the side plates or is secured to said side plates, as desired. The upper end of the casing is covered by a cap H, which is shown in perspective view in Fig. 6 and protects the operating mechanism.

To the lower end of the lifting-bar D is secured or formed a back projecting hook D', which turns slightly upward and is adapted to engage a log close t-o the ground. In many cases it is very desirable to have such a device as this, as it is impossible to conveniently lower the jack sufficiently to engage the upper end of the lifting-bar with the under surface of the log. To accommodate the hook D', the rear edge of the groove between the plates A is left open. By these improvements the jack is made stronger and more convenient in its operation than formerly.

Having thus fully described my invention,

-l claim as new and desire to secure by Letters Patent- A logging-jack, comprising a casing or standard consisting of two side plates, a fillerbar secured between one side edge of the plates, said plates projecting at one side beyond the filler-bar to form a channel, and one of them in the upper part of the casing or IOO xo the inner edge of the lifting-bar, a pinion j ournaled in the casin g or standard and meshing with said teeth, a lock engaging the pinion to prevent backward movement, and a stepby-step forward rotating device for said pinion, substantially as described.

ALEXANDER MNSIE GILCHRIS'I.

Vitnesses:

CHESTER M. EGBERT, CHARLES FOSTER.

US71304799A 1899-04-14 1899-04-14 Logging-jack. Expired - Lifetime US641951A (en)

Priority Applications (1)

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US71304799A US641951A (en) 1899-04-14 1899-04-14 Logging-jack.

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Application Number Priority Date Filing Date Title
US71304799A US641951A (en) 1899-04-14 1899-04-14 Logging-jack.

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US641951A true US641951A (en) 1900-01-23

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