US3601978A - Shortening claw - Google Patents

Shortening claw Download PDF

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Publication number
US3601978A
US3601978A US860254A US3601978DA US3601978A US 3601978 A US3601978 A US 3601978A US 860254 A US860254 A US 860254A US 3601978D A US3601978D A US 3601978DA US 3601978 A US3601978 A US 3601978A
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US
United States
Prior art keywords
shortening claw
shortening
claw
hooks
pocket
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US860254A
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English (en)
Inventor
Werner Helmut Rieger
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Individual
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Individual
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Filing date
Publication date
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Publication of US3601978A publication Critical patent/US3601978A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G17/00—Hooks as integral parts of chains
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C49/00—Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
    • C07C49/587—Unsaturated compounds containing a keto groups being part of a ring
    • C07C49/613—Unsaturated compounds containing a keto groups being part of a ring polycyclic
    • C07C49/617—Unsaturated compounds containing a keto groups being part of a ring polycyclic a keto group being part of a condensed ring system
    • C07C49/643—Unsaturated compounds containing a keto groups being part of a ring polycyclic a keto group being part of a condensed ring system having three rings

Definitions

  • the present invention refers to a double-tine shortening claw for chains which formed of two hooks connected to each other by a backpiece and the prongs of which, arranged substantially parallel to each other, are connected at least at the ends to the claw body by cross bars and form a pocket to receive and support a chain link arranged substantially perpendicular to the plane of the slot defined by the prongs.
  • a shortening claw of the above type is already known in which the shape of the pocket must be adapted relatively precisely to the dimensions of the chain links in order to make certain that the chain can be unhooked therefrom only under certain conditions (German Petty Patent 1,929,820 In the case of known claws, if there is not an exact matching to the dimensions of the links of the chain, then there is the danger that when the chain lies loose, the shortening claw may unintentionally become disengaged unless safety stirrups are additionally applied'after insertion of the chain.
  • the object of the present invention is to provide a shortening claw in which unhooking of the chain is dependably avoided without the use of a lock stirrup, not only in its stretched position but also in the loose position of the chain, and with which lengths of chain having chain links of different size can be shortened.
  • this object is achieved in that in the chain of the aforementioned type, the pocket in the region facing the outer sides of the arms of the supported link is provided in each case with at least one elastic insert member, and the opposing insert members form a pair of clamping jaws for the supported link introduced in each case into the pocket.
  • the shortening claw of the invention combines the advantages of ease of handling and greater assurance against disengagement, even when the length of chain is completely without a load thereon. Since the elastic insert members are capable of compensating for differences in dimensions between chain links hooked in the shortening claw, one claw can be used for more types of chains than was heretofore possible.
  • the hooks form windows having a peripheral annular bead which engages in an annular groove of the corresponding insert member.
  • Such a development permits a particularly simple mounting and removal of the elastic insert members. This is advantageous when an insert member is to be replaced. Since the shortening claw is frequently exposed to external wear, it has been found advisable that the outer surfaces of the insert member do not protrude beyond the outer surfaces of the shortening claw.
  • FIG. 1 is a front view of a first form of shortening claw of the invention with a partial section taken along the line l-l in FIG. 2;
  • FIG. 2 is a cross section seen in the direction of the longitudinal axis of the shortening claw of FIG. 1;
  • FIG. 3 is a section along the line III-III of FIG. 2;
  • FIG. 4 is a section corresponding to FIG. 3 through a modified form of a shortening claw
  • FIGS. 5 and 6 are perspective views showing two modified elastic insert members for shortening claws made in accordance with the invention.
  • 11 and 12 are two hooks connected with each other by a backpiece 113, the prongs M, 15 of which are connected at their ends with the claw body by crosspieces l6, 17.
  • a bolt (not shown) by means of which the shortening claw can be hung up in a manner of a link.
  • the hooks ll, 12 and the backpiece 13 form a pocket to receive and support a chain link 21, arranged substantially perpendicular to the plane of the slot 20, of a length of chain which is to be shortened.
  • the pocket is aligned in the region of the outer sides of the arms 22, 23 of the supported link 21 by elastic insert pieces 24, 25, the distance between which is about 10 percent less than the outside width of the chain link Zl which normally corresponds to 3.35 to 3.4 times the value of the nominal thickness of the chain link.
  • the insert members 24, 25 have a circumferential groove into which an annular head of the opening formed by the hooks engages so as to lock it in its proper position. As can be noted from FIGS. 1 and 2, the outer surfaces of the insert members do not protrude beyond the outer surfaces of the shortening claw so that they are substantially protected against wear.
  • insert members 26, 27 are, however, arranged in potshaped receiving chambers 28, 29, which have small boreholes 30, 31 in the region of their bottom extending to the outside which serve to facilitate the removal of the insert members by permitting the insertion of an ejection tool.
  • the insert members are deformed elastically upon the introduction of the chain link 21 and bringing into action elastic holding forces which hold the chain link fast in the claw, even under unfavorable conditions.
  • the length of the prongs l4, 15 which extends from the lower edge of the claw to the prong tip must be sufiiciently large to provide assurance that the chain to be hung on the shortening claw can only be taken out when the link which follows the link 21 held therein is bent sharply out of the direction of pull of the stretched chain.
  • FIG. 5 shows in perspective an insert member 32 having a central bore 33.
  • This bore serves to increase the flexibility of the insert piece in the case of materials which are intrinsically of only slight softness, such as plastics which are insensitive to oil, cold and heat.
  • the insert member 34 of FIG. 6 is grooved on the clamping surface 35.
  • the grooving exerts a favorable effect insofar as it keeps low the differences between the clamping forces in case of dry and wet friction.
  • a two-prong shortening claw for chains said claw being formed of two hooks connected with each other by a backpiece, the prongs of said hooks being arranged substantially parallel to each other, the hooks being connected at least adjacent their ends by crosspieces to the claw body, and forming a pocket to receive and support a chain link arranged substantially perpendicular to the plane of a slot defined by the prongs, the pocket being provided in a region facing the outer sides of a supported chain link with at least one elastic insert member to form a clamping jaw for a supported link carried in the pocket.
  • distance between the insert members is approximately 10 percent less than the outside of the chain links.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hooks, Suction Cups, And Attachment By Adhesive Means (AREA)
  • Clamps And Clips (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
US860254A 1968-09-27 1969-09-23 Shortening claw Expired - Lifetime US3601978A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681775813 DE1775813B1 (de) 1968-09-27 1968-09-27 Doppelzinkige Verkuerzungsklaue fuer Ketten

Publications (1)

Publication Number Publication Date
US3601978A true US3601978A (en) 1971-08-31

Family

ID=5702725

Family Applications (1)

Application Number Title Priority Date Filing Date
US860254A Expired - Lifetime US3601978A (en) 1968-09-27 1969-09-23 Shortening claw

Country Status (8)

Country Link
US (1) US3601978A (enrdf_load_stackoverflow)
AT (1) AT288793B (enrdf_load_stackoverflow)
BE (1) BE738686A (enrdf_load_stackoverflow)
CH (1) CH513348A (enrdf_load_stackoverflow)
DE (1) DE1775813B1 (enrdf_load_stackoverflow)
FR (1) FR2018995A1 (enrdf_load_stackoverflow)
NL (1) NL140605B (enrdf_load_stackoverflow)
NO (1) NO125744B (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3729926A (en) * 1971-05-25 1973-05-01 E Buske Claw hook for chains
US4151708A (en) * 1977-03-18 1979-05-01 Smetz Reinhold G E Chain-shortening claw
US4865374A (en) * 1988-05-05 1989-09-12 Gonda Walter S Double hook logging chain assembly
WO1994025777A1 (en) * 1993-04-29 1994-11-10 Minister Trading Co. Pty. Ltd. Chain engaging device
US5724804A (en) * 1993-12-23 1998-03-10 Rud-Kettenfabrik Rieger & Dietz Gmbh.U.Co. Shortening claw
US5732545A (en) * 1995-12-22 1998-03-31 Fredriksson; Lars Olot Arne Coupling link
US6568165B2 (en) * 2000-09-04 2003-05-27 Rud-Kettenfabrik Rieger & Dietz Gmbh U. Co. Component which can be used in conjunction with link chains
CN101228365B (zh) * 2005-07-23 2010-11-24 路德链条里格及荻茨联合有限公司 爪部,尤其是缩短爪部
US11111110B2 (en) * 2019-03-14 2021-09-07 Pewag Austria Gmbh Shortening hook with coupling connection

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2165568C3 (de) * 1971-12-30 1981-04-23 Eisen-und Drahtwerk Erlau AG, 7080 Aalen Klauenhaken für Zugketten, insbesondere für Anschlagketten
DE2433345C2 (de) * 1974-07-11 1981-12-10 Fa. August Thiele, 5860 Iserlohn Verkürzungsklaue für Gliederkettenstränge
SE421118B (sv) * 1977-04-20 1981-11-30 Bergs Smide Ab K A For koppling till en ketting avsedd gripkrok
DE2908234A1 (de) * 1979-03-02 1980-09-11 Thiele Fa August Kettenklaue, insbesondere als zubehoerteil fuer streb- oder streckenfoerderer im untertagebergbau
DE2947871C2 (de) * 1979-11-28 1990-05-31 Fa. I.D. Theile, 5840 Schwerte Doppelzinkige Verkürzungsklaue

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2179564A (en) * 1938-05-17 1939-11-14 Superior Hand Brake Company Slack adjuster
US2878640A (en) * 1957-05-13 1959-03-24 Johnson Fritz Safety chain claw
US3233933A (en) * 1963-11-13 1966-02-08 Bernard F Coski Dual capacity chain hooks
US3333412A (en) * 1962-09-21 1967-08-01 Rieger Werner Double-clawed shortening hook

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1929820U (de) * 1962-09-21 1965-12-23 Rud Ketten Rieger & Dietz Verkuerzungsklaue.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2179564A (en) * 1938-05-17 1939-11-14 Superior Hand Brake Company Slack adjuster
US2878640A (en) * 1957-05-13 1959-03-24 Johnson Fritz Safety chain claw
US3333412A (en) * 1962-09-21 1967-08-01 Rieger Werner Double-clawed shortening hook
US3233933A (en) * 1963-11-13 1966-02-08 Bernard F Coski Dual capacity chain hooks

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3729926A (en) * 1971-05-25 1973-05-01 E Buske Claw hook for chains
US4151708A (en) * 1977-03-18 1979-05-01 Smetz Reinhold G E Chain-shortening claw
US4865374A (en) * 1988-05-05 1989-09-12 Gonda Walter S Double hook logging chain assembly
WO1994025777A1 (en) * 1993-04-29 1994-11-10 Minister Trading Co. Pty. Ltd. Chain engaging device
US5724804A (en) * 1993-12-23 1998-03-10 Rud-Kettenfabrik Rieger & Dietz Gmbh.U.Co. Shortening claw
US5732545A (en) * 1995-12-22 1998-03-31 Fredriksson; Lars Olot Arne Coupling link
US6568165B2 (en) * 2000-09-04 2003-05-27 Rud-Kettenfabrik Rieger & Dietz Gmbh U. Co. Component which can be used in conjunction with link chains
CN101228365B (zh) * 2005-07-23 2010-11-24 路德链条里格及荻茨联合有限公司 爪部,尤其是缩短爪部
US11111110B2 (en) * 2019-03-14 2021-09-07 Pewag Austria Gmbh Shortening hook with coupling connection

Also Published As

Publication number Publication date
FR2018995A1 (enrdf_load_stackoverflow) 1970-06-26
NO125744B (enrdf_load_stackoverflow) 1972-10-23
NL6914663A (enrdf_load_stackoverflow) 1970-04-01
NL140605B (nl) 1973-12-17
BE738686A (enrdf_load_stackoverflow) 1970-02-16
DE1775813B1 (de) 1971-08-26
AT288793B (de) 1971-03-25
CH513348A (de) 1971-09-30

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