Joint

Patent metadata

Field	Value
Publication number	US-9757867-B2
Application number	US-201615065365-A
Country	US
Kind code	B2
Filing date	Mar 9, 2016
Priority date	Mar 19, 2015
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A joint for a cutting tool includes a bolt with a head in a first end, with a thread in a second end, and with an intermediate section between the first end and the second end, which during attachment of two objects rotatably to each other protrudes trough openings in said objects. A nut is received on the thread. In order to provide an easy solution for adjusting the tension of the joint and at the same time preventing accidental loosening of the joint, the bolt is provided with a cavity. An expansion bolt with a threaded end protrudes into the cavity and expands the second end of the bolt.

First claim

The invention claimed is:

1. A joint assembly comprising:
a first object;
a second object;
a bolt with a head in a first end, with a thread in a second end and with an intermediate section between the first end and the second end, and which during attachment of said first and second objects rotatably to each other protrudes through openings in said first and second objects, and
a nut received on said thread for keeping said first and second objects together between said head and said nut,
an end surface of the bolt in the second end of the bolt is provided with a cavity that extends in an axial direction of the bolt and that has a wall with a thread, and
an expansion bolt with a threaded end protruding into said cavity and engaging the thread on the wall, said expansion bolt having a larger diameter than a diameter of the cavity such that forces expanding the second end of the bolt are directed by the expansion bolt towards the wall of the cavity, wherein:
the cavity extends in the axial direction of the bolt from the end surface to the first end of the bolt,
an outer side surface of the second end of the bolt is provided with a slit which provides an opening into the cavity from the side of the bolt,
the cavity has a smaller diameter at the first end of the bolt than at the second end of the bolt,
the thread on the wall of the cavity is located at the first end of the bolt in the part of the cavity which has the smaller diameter,
said slit extends from said end surface in the second end of the bolt towards the first end of the bolt without reaching the first end of the bolt where the cavity has said smaller diameter and where said thread on the wall of the cavity is located, and
the expansion bolt has a head with an inclined outer side surface contacting the wall of the cavity at the second end of the bolt for expanding the second end of the bolt.

2. The joint assembly according to claim 1 , wherein contact surfaces of the expansion bolt and of the cavity are mutually inclined such that the expansion bolt works as a wedge expanding the second end of the bolt when the expansion bolt is moved inwards into the cavity.

3. The joint assembly according to claim 1 , wherein the intermediate section of the bolt has a generally cylindrical shape.

4. The joint assembly according to claim 1 , wherein the first and second objects are a pair of cutting blades, and wherein the joint is a joint of a cutting tool which attaches rotatably to each other said pair of cutting blades.

5. A cutting tool, comprising:
a first cutting blade coupled to a first handle and a second cutting blade coupled to a second handle;
the first cutting blade and the second cutting blade each having a through hole in co-alignment;
a joint assembly disposed at least partially within the through hole to rotatably join the first cutting blade and the second cutting blade together, the joint assembly comprising:
a bolt with a head in a first end, with a thread in a second end and with an intermediate section between the first end and the second end, and which protrudes through the through holes,
a nut received on the thread to keep the cutting blades together between the head and the nut,
an end surface of the bolt in the second end of the bolt having a cavity that extends in an axial direction of the bolt and that has a wall with a thread,
an expansion bolt with a threaded end protruding into the cavity and engaging the thread on the wall, the expansion bolt having a larger diameter than a diameter of the cavity such that forces expanding the second end of the bolt are directed by the expansion bolt towards the wall of the cavity,
wherein the cavity extends in the axial direction of the bolt from the end surface to the first end of the bolt, an outer side surface of the second end of the bolt is provided with a slit which provides an opening into the cavity from the side of the bolt, the cavity has a smaller diameter at the first end of the bolt than at the second end of the bolt, the thread on the wall of the cavity is located at the first end of the bolt in the part of the cavity which has the smaller diameter, said slit extends from said end surface in the second end of the bolt towards the first end of the bolt without reaching the first end of the bolt where the cavity has said smaller diameter and where said thread on the wall of the cavity is located, and the expansion bolt has a head with an inclined outer side surface contacting the wall of the cavity at the second end of the bolt for expanding the second end of the bolt.

6. The cutting tool according to claim 5 , wherein contact surfaces of the expansion bolt and of the cavity are mutually inclined such that the expansion bolt works as a wedge expanding the second end of the bolt when the expansion bolt is moved inwards into the cavity.

7. The cutting tool according to claim 5 , wherein the intermediate section of the bolt has a generally cylindrical shape.

Assignees

• Fiskars Finland Oy Ab

Inventors

• Heine Mikko
• Sokka Mika

Classifications

• F16B39/023

  by driving a conic or wedge-shaped expander through the threaded element · CPC title

• A01G3/02

  Secateurs; Flower or fruit shears · CPC title

• Y10T403/32967

  Attached to or integral with one member · CPC title

• B26B13/28 Primary

  Joints (B25B7/06 takes precedence) · CPC title

• B25B7/08

  with fixed fulcrum · CPC title