US1503789A - Well elevator - Google Patents

Description

Aug. 5 1924. 1,503,789

J. GRANT WELL @LEVATOR Original Filed: April 13, 1922 umlll I JVENTOR, M

atent Aug. 5, 1924.

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JOHN GRANT, OF LOS ANGELES, CALIFORNIA, ASSIGNOR T DUNN MANUFACTURING COMPANY, OF OXNARD, CALIFORNIA, A CORPORATION OF CALIFORNIA.

WELL ELEVATOR.

Original application flled April 13, 1922, Serial No. 552,264. Divided and this application filed May 2.

' 1923. Serial No. 636.101.

T 0 all whom it may concern:

Be it known that I, JOHN GRANT, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and 5 State of California, have invented new and useful Improvements in Well Elevators. of which the following is a specification.

This invention relates to well elevators, and was originally disclosed in application filed by me April 13, 1922, Serial No. 552,264

for well elevators, the present subjectmatter being divided from such original application.

The invention has for its objects the provision of improvements in well elevators particularly relating to a supporting member or suspensionlmeans and means for automatically normally retaining the supporting member or suspension means in a given relation to the remainder of the elevator or a projection therefrom, whereby the supportmg member or suspension means may be automatically released to free the same from the elevator, or may be released voluntarily or manually, as preferred, when the elevator has been lowered with the tubing or casing or other load, so as to contact with an object to engage with a; pawl or other means, or so that the pawl or likeimeans may be manually or otherwise voluntarily operated. Other objects will appear.

The invention consists in the novel and useful provision, formation, combination, association and relative arrangement of parts, members and features, all as hereinafter described, shown in the drawing and finally pointed, out in claims.

In the drawing:

Figure 1 is a perspective illustration of an elevator constructed and equipped in accordance with the invention; and,

Figure 2 is a front elevation of a slightly modified form of means for automatically retaining the supporting member or suspension means in connection with the remainder of the elevator, which latter is shown in vertical section in part, the suspension meansbeing fragmentally illustrated in operative position in this view, as well as in Figure 1.

Corresponding, parts in both figures are designated by the same reference characters.

Referring with particularity to the drawing, the elevator is shown as comprising a body A provided with a gate or door B and the body is preferably provided with open hook-like members 26 to engage with links 27 and with a relatlvely large base plate or member'28. The large base member 28 is provided for the purpose of eliminating the use of catching or supporting tongs, or forks or slips, otherwise necessary with this type of device.

Well casings are often of relatively large inner diameter. The working tools, or drillpipes, or other similar articles, operated within the casing, however. are normally of different standard sizes of casings, and of relatively small outside measurement. The main portions of an elevator of this type are therefore eventually so small that the whole elevator might fall into the casing. The forks, tongs, and slips, above referred to, are therefore normally used to catch the elevator above the upper end of the large casing.

Providing the small elevator with the large base member is therefore very convenient and time-saving, without adding too much weight to such a device.

Pawls 29 are provided, pivotally engaged at 30 to the elevator. one at each side, having weight members 31 projecting beyond the pivots 30 so as to automatically obstruct'the open hook-like ends 26 of the elevator for holding the links 27 engaged with the elevator, and preventing an accidental disengaging. Whenever the elevator is lowered to the floor, the pawlsxautomatically move, and the links can then be removed.

A slightly modified form of this pawl structure is illustrated in Fig. 2.. The pawl 32 is also 'pivotally engaged with the base plate 33 in this form, at 33*. The weight portion 34 of the pawl in this form, however, is shaped to form a suitable continuation of the base, so that the base can be extended by means of the pawl. The pawl portion 32 in this form swings into the recess 35 in the body 4 when the device is in resting position, as indicated in dotted lines.

Having thus disclosed my invention, *1 claim and. desire to secure by Letters Patent:

1. In an elevator having a body provided with open hook-like portions for engaging supporting links, a pawl pivotally engaged to the body near each of the hook-like portions ofthe body and having weighted portions forming balancing means for the pawls disposed so as to form an obstruction to the open hook-like portions of the body when the body is in lifted position and adapted to move to open position when the body is lowered to a resting position.

2. In an elevator, a'body having open hook-like portions for engaging supporting links, and pawls pivotally engaged to the body having portions extending beyond the base forming balancing means for the pawls so as to automaticallv keep the open hook-' like portions of the body obstructed when the body is in lifted position and adapted to move to open position when the body is lowered to resting position thereby forming an extension to the base of the body. 7

3. In an elevator, a body having a projection for engaging a supporting member, and a pawl pivotally associated with the body and having a portion extending beyond the base of the body and forming a balancing means for the pawl to automatically and normally retain the supporting member in .a given relation to the projection.

4. In an elevator, a body having a projection for engaging a supporting member, and a pawl pivotally associated with the body and having a portion extending boyond the base of the body and forming a balancing means for the pawl to automatically and normally retain the supporting member in a given relation to the projection; said extending portion forming an extension to the base of the body when engaged from beneath.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

- JOHN GRANT.

Witnesses:

J. SHUTT, EDNA TURNER.

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