US1614300A - Valve-lifting tool - Google Patents

Description

11 1927' -w. F. HOBBS ET Al.

VALVE LIETING TOOL Filed August 28, 1926 ii! V gnwntoo Elm: "c4 5 plete Patented Jan. 11, 1927.

UNITED STATES- PATENT ()FFICE."

WILLIS F. HOBBS AND JOHN A. ANDERSON, or BRIDCEPORT, CONNECTICUT, AS-

SIGNORS To THE BRIDGEPORT HARDWARE MANUFACTURING CORPORATION, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF CONNECTICUT.

. VALVE-LIFTING TOOL.

Application filed August 28, 1926. Serial NO. 132,090.

This invention relates to valve-spring lifting tools such as are used for compressing the springs of gas engine valves to facilitate removal of the valve, and has for an object to provide an improved construction of tool for this purpose which will be simple in construction, strong and durable, and easily operated.

It is also an object of the invention to provide a device of this character which will comprise a small number of parts so arranged that opposed elements are duplicates of each other so as to reduce to a minimum the number of different parts which must be manufactured, and thus reduce the'number of tools and dies required for manufactur lt is another object of the invention to provide a simple and effective means for holding the spring-compressing aws to maintain the springs Compressed until the jaws are released.

l/Vitli the foregoing and other objects in view, we have devised a construction thepreferred form of which is illustrated in the accompanying drawing. In this drawing,

Fig. 1 is a top plan view of the tool com- Fig. 2 is a side elevation thereof, a portion of one of the handles being broken away to more clearly show the construction;

Fig. 3 is a transverse section substantially on line 3-3 of Fig. 2; and V Fig. 4: is a transverse section substantially on line H of Fig. 2.

Our improved tool comprises a pair of hand levers 5 pivoted together by means of a rivet 6. These levers each comprises a hand grip 7 and an arm 8 respectively located to the rear and forwardly of the pivot'6, but both on the same side of this pivot. The lever comprisesa singlepiece of metal-with the hand grip 7 substantially U-shaped in At-the point of thepivot 6 the extension 9 is offset at 10 which offsets engage each other when the levers are assembled giving a better bearing and spacing the remaining portions which cross each other'a slight dis tance so thatthey donot rub together, and also provide space for the catch 11 for holding the jaws separated.

Pivoted' to each ofthe arms 8 at the free ends thereof is a jaw supporting member 12. This member has a body portion substantially U-shaped in cross-section, and they are arranged with the Open sides opposed so that the arm 8 extends between the sides of this U-shaped portion and is pivoted thereto by the pivot 13. Each member 12 carries a jaw lt'which is preferably provided with an open-sided recess 15 for engaging about the valve stems withthe jaws between this spring and its abutment in the usual man ner. One side of the U-shaped body of the jaw support 12 is extended rearwardly,v as.

tension is connected by a-link 17 to the opposite lever, the link having pivotal connec- 7 tion with the extension at 18 and to the opposite lever at '19. It will be noted that the jaw supporting members 12 arereversed and arranged with their open sides opposed. This allows the use of duplicate structures for the two jaws so that they may be made with the same-tools.

It is preferred that the pivots 18 and 19 be substantially the same distance to the rear of the pivot 6 between the levers as the pivotal connections 13 are spaced forwardly of this pivot, so that when the hand grips are pressed together the jaws will be separated and the links 17 during this movement will maintain them in substantially parallel relation. As the links are freely pivoted to the jaw'supports and the levers there are no pin and slot connections required between the supports and the levers to allow for relative longitudinal movements as the levers are operated. This makes a very rigid construction vwhich is not liable to work loose and does not wear rapidly in operation.

The catch 11 is provided to hold the jaws in separated relation to prevent their closing under the action of the springwhen it is compressed. This catch comprises a lever pivoted to one of the levers.5, preferably on the same pin or rivet 19 by which a link'lr" is pivoted to this lever. At one side edge the catch is provided "with a series of notches 20 adapted to engage across-pin 21* in theopposite handle, it being understood that the lever projects into the space between the side portions of this grip. On the opposite side of its pivot thiscatch lever projects beyond the levers and is bent laterally to provide athumb-piece 22 for operation. to release the, catch. A spring; 23

mountedwithin the other hand grip,;is connected-to'this lever at 24l atone encLand-to a struckup lug 25 at the-other end in the hand grip; catch clockwise about its pivot, as viewed in Fig. 2', and hold'it against the pin 21. The

sides of the notches 20lare inolinedsothat;

when the hand grips are pressedtogether to separate the jaws this catch Wlll' merely slideover the pin, but the pin will-catclrin diflerent recessesto prevent movement 'm-the opposite direction until the catch isreleased by pressure on the thumb-piece 22.

Having thus set forth the nature of our invention, what we claim is:

1. In a device of the character described, a

pair of hand levers pivoted together having hand grips extending"rearwardly; from the pivot and arms extending-forwardly from the pivot and located respectively on the same side of-the pivot as the corresponding hand grip, a pair. of; jaw supporting ainen bers each pivoted to the free end50- one of said arms, and a link fixedly pivoted vto each jaw support rearwardly of thelpiv ot-and. to the opposite lever.

52. Ina device of the character deseribed, a pair-0f hand levers pivoted together; each inclu-dinga hand grip extendingzto the rear of the. pivot and an arm extending for wardly of the pivot and arranged with both said portions of the lever on the same side i of thepivot, a jaw support pivotedtoeacli arm and having an extension projecting.

rearwardly of the pivot, and a link pivoted to said extension to the rear of said-plvot in allpositions and also to the opposite lever.

3. In a device of the character described, a pair oi hand levers pivotedtogether hav-. ing hand grips extending rearwardlyi'roin the. pivot and diverging arms extending forwardly from the pivot, a jaw supporting member pivoted to the free end of each This spring ,ten ds to swing the each .havinga body. portion of substantially.

U fshape in cross-section arranged with their open sides opposed and between the sides o'f-which the tree ends'oi said armsextend and to whichthey are pivoted, and-a link pivoted to each support; and to the opposite lever, both pivots being rearwardly of the pivot between the lovers;

5. In a.-device; oiithe character described, a pair of hand leverspivoted together llttVr ing hand grips extending rearwardly from the pivot and armsextending forwardlyfrom-the pivot and located respectivelyon the same side ofthe p vot as the correspond inghand grip, a pair of jaw supporting.-

members each having a body portion of sub-= stantially 1 U-shape in cross-section arranged with their open sides opposed-and between the sidesofwhichthe free ends of said arms: extend and to which {they are pivoted,- and a link pivoted to each jaw sup'port and to the opposite lever, both pivots being reara'va-rd ly of the. p vot between the levers.

GQIIL a device of the-Jcharacter; described, a pair ofhandlevers pivoted" together hav-- ing. hand. gripsgextendi'ngf rearwardly from the pivot and arms extending forwardly from the pivot and located respectively. on

the same side of the pivot as the correspond ing hand. grip, a pair of aw. supporting members each pivoted to thefree endof one oit'said arms, a linlepivoted to eachjaw support and the opposite leverrearwardly of the pivot between the levers,a catch pivoted onthepivotal connectionof one of said lin rs to its lever and having holding. teeth, means.

on the other lever to coact with said teeth to hold the-levers againstrelative movement in one direction, and aspring tendingioi move said catch to holdingv position.

In testimony whereof we affix our signa.--

tures.

IVILLIS F. HOBBS.

J OI- IN A. ANDERSON.

Images