US1439677A - Mining-machine jack - Google Patents

Description

Dec. 19, 1922. 1,439,677 M. P. HOLMES.

MINING MACHINE JACK.

FILED APR. 2. 1919.

Rig. 4.

110v 7710 his [021- y m w to engage with the coal.

Patented D... 19, 1922.

UNITED. STATES 1,439,677 PATENT OFFICE.

MORRIS P. HOLMES, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOB TO SULLIVAN MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS.

MINING-MACHIN E JACK.

Application filed April 2,

To all whom it may concern:

Be it known that I, MORRIS P. HOLMES, a citizen of the United States, residing at Claremont, in the county of Sullivan and State of New Hampshire, have invented certain new and useful Improvements in Mining-Machine Jacks, of which the following is a full, clear, and exact specification.

y invention relates to mining machine jacks.

It has for its object to'provide an improved jack adapted to form a sturdy connection and to be readily removed when desired. A further object of my invention is to provide an im roved jack having the characteristics mentioned above and referably also adapted to use as a bar, W ich is of simple yet rugged construction and adapted to be manufactured at small expence.

In the accompanying drawings, I have shown two embodiments which my invention may assume in practice.

In these drawings,-

Fig. 1 is a side elevation of my improved jack in operative position.

Fig. 2 is a rear view of the same.

Fig. 3 is a side elevation of the same when in break-down position.

Fig. 4 is a side elevation of a modified form of jack adapted also to use as a bar.

In this illustrative construction, it will be observed that I have shown a jack including a main body portion 1 forming substantially the entire length of the jack and having a point or end member 2 on one end adapted As shown, this body portion 1 is provided with a longitudinal slot 3 in its lower end and has pivotally connected thereto at the lower end of this slot 3, as on a suitable transverse pivot member 4 formed in a lateral extension 5,

an extension or foot-piece 6. This member 6 has, as shown, a point 7 on its lower end and at one side of and substantially beneath the pivot, and an extension 8 on its upper end and above the pivot. As shown, this extension 8 is elongated and adapted in one 1gosition to occupy the position shown in ig. 3, wherein it is disposed at an angle to the slot in the member 1, or in another position to occupy the position shownin Fig. 1, wherein it is received in the slot 3 and engages the bottom thereof. It will also be observed that operatively connected to the 1919. Serial No. 287,025.

pivot member 4, I preferably also provide a draft connection, herein in..the form of a hook 9 adapted to receive the end of a feed member, such for example as a mining machine feed chain 10.

In the use of my improved construction, the jack is first set, preferably as shown in Fig. 3, with the two points 2 and 7 engaging the coal. The chain 10 is then connected to the hook 9. As a result, when the chain is placed under tension, the same acts automatically to move the parts of the jack from the position shown in Fig. 3 to the position shown in Fig. 1, wherein the extension 8 is seated in the slot 3 and, through its pressure gainst the'bottom of the slot, forms a rigid utment, the ends of which are adapted to ecome more deeply embedded in the coal as the pull on the chain 10 increases. Obviously, however, when the tension on the chain 10 is released, all that it is necessary to do is to kick in the pivot of the same, whereupon the jack is broken, position shown in Fig. 3, so that the operator, upon grasping the jack, may readily lower i assuming the In Fig. 4, I have illustrated a modified form of this construction, wherein in addirendered rigid throughout its length in such a manner as to'adapt it to be used as a bar.

It will also be observed that in this form of my invention a lateral extension 13 is also provided on the lower end of the member 1 to facilitate the barring o erations. Thus, it will be observed that whi e the form of my invention shown in this figure is adapted to use in the same relations as the form shown in Figs 1 to 3, it is also adapted to be used at will either as a rigid jack or a rigid bar.

In my improved construction, it will be observed that due to the cooperation of the extension 8 on the foot-piece with the body portion 1 of the jack, great strength is obtained, the foot-piece and body portion thereby forming a substantially unitary construction during use. Due to the provision of the pivot 4 on the lateral extension 5, .it

will also be observed that the pivot is disposed at one side of the line connecting the extremities of the points 2 and 7, so that when tension upon the draft connection is relieved. the same will remain firmly embedded in the coal until intentionally released by kicking in the pivot. Attention is also directed to the fact that the construction shown is exceedingly simple and rugged and adapted to bemanufactured at small expense. These and other advantages of my improved construction will, however. be clearly apparent to those skilled in the art.

'hile I have in this application specifically described two embodiments which my invention may assume in practice, it is to be nnderstood that these forms are shown for illustrative purposes only and that the invention may be further modified and embodied in various other forms without departing from its spirit or the scope of the appended claims hat I claim as new and desire to secure by Letters Patent is:

1. A mining machine jack having a lateral draft connection and comprising an elongated body member. and an extension thereof pivotally connected between its ends to said member.

2. A mining machine jack having a lateral draft connection and including an elongated body member, and a foot-piece pivotally connected between its ends to one end thereof.

A mining machine jack comprising a body member. a pivotally mounted foot piece disposed parallel therewith. and a draft connection on the pivot thereof.

4. A mining machine jack having a lateral draft connection and comprising an elongated body member, and a pivoted footpiece. one engaging the other at one side of the pivot.

5. A mining machine jack having a lat eral draft connection and including an elongated body member. and a foot-piece pivotally connected between its ends to one end thereof and having a member engagable therewith.

6. A mining machine jack having :1 lat eral draft connection and including an elongated body member. and a foot-piece pivotallv connected between its ends to one end thereof on a laterally offset pivot.

'i'. A mining machine jack including an elongated body member. a foot-piece piw otally connected between its ends to one end thereof. and a draft connection adjacent said pivotal connection.

8. A mining machine jack having a lateral draft connection and comprising an elongated body portion having a slotted endQand a foot-piece pivoted at a point intermediate its ends to one end thereof and having a member receivable in the slot therein.

9. A mining machine jack having a lateral draft connection and comprising pivotally connected interengaging end portions pivotally connected at one side of a line between their free extremities.

10. A mining machine jack comprising pivotally connected interengaging end por tions pivotally connected at one side of a line between their free extremities, and a draft connection on said pivot.

11. A mining machine jack comprising pivotally connected end portions engagable at one side of their pivot. and a draft connection operatively connected to the pivot.

12. A mining machine jack having a lateral draft connection and comprising pivotally connected and interengaging members adapted to form a rigid structure when subject to tension and to maintain the same after tension is removed.

13. A mining machine jack having a lateral draft connection and comprising an elongated body portion, a foot-piece pivotally connected at a point intermediate its ends to one end thereof. and means for rigidly connecting said elements.

14. A mining machine jack having a lateral draft connection and comprising an elongated body portion, a footpiece pivotally connected at a point intermediate its ends to one end thereof. and a reciprocable clamping collar for rigidly connecting said elements.

.15. A mining machine jack comprising an elongated body portion having a slotted end. a foot-piece pivoted at a point intermediate its ends to one end thereof and having a member receivable in the slot therein. and a draft connection connected adjacent the pivot point.

16. A mining machine jack comprising an elongated body member having a lateral extension on one of its ends. a foot-piece pivotally mounted at a point intermediate its ends adjacent said extension, a draft connection operable upon said pivotal connection, and means for rigidly connecting said body member and foot-piece.

17. In a mining machine jack. a pair of pivotally connected interengaging end portions pivotally connected at a point which is disposed at one side of a line connecting their free ends prior to placing said jack in operative position. anr disposed at the opposite side of such a line when said jack is loaded. and a draft connection adjacent said pivot.

In testimony whereof I aflix my signature.

MORRIS P. HOLMES.

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